entry_32.S revision a5e37863ab31d78faddff15675c89979792bc0bd
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1991, 1992 Linus Torvalds 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * entry.S contains the system-call and fault low-level handling routines. 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This also contains the timer-interrupt handler, as well as all interrupts 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and faults that can result in a task-switch. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: This code handles signal-recognition, which happens every time 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * after a timer-interrupt and after each system call. 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * I changed all the .align's to 4 (16 byte alignment), as that's faster 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * on a 486. 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 17889f21ce272e38db19c8114a7e0a5793d4590077Andi Kleen * Stack layout in 'syscall_exit': 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ptrace needs to have all regs on the stack. 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * if the order here is changed, it needs to be 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * updated in fork.c:copy_process, signal.c:do_signal, 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ptrace.c and ptrace.h 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0(%esp) - %ebx 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4(%esp) - %ecx 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8(%esp) - %edx 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * C(%esp) - %esi 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10(%esp) - %edi 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 14(%esp) - %ebp 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 18(%esp) - %eax 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1C(%esp) - %ds 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 20(%esp) - %es 32464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge * 24(%esp) - %fs 33ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 28(%esp) - %gs saved iff !CONFIG_X86_32_LAZY_GS 34ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 2C(%esp) - orig_eax 35ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 30(%esp) - %eip 36ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 34(%esp) - %cs 37ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 38(%esp) - %eflags 38ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 3C(%esp) - %oldesp 39ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 40(%esp) - %oldss 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * "current" is in register %ebx during any slow entries. 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/linkage.h> 45d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris#include <linux/err.h> 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/thread_info.h> 4755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#include <asm/irqflags.h> 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/errno.h> 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/segment.h> 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/smp.h> 510341c14da49e7b93d2998926f6ac89a3129e3fa1Jeremy Fitzhardinge#include <asm/page_types.h> 52be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev#include <asm/percpu.h> 53fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich#include <asm/dwarf2.h> 54ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov#include <asm/processor-flags.h> 55395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar#include <asm/ftrace.h> 569b7dc567d03d74a1fbae84e88949b6a60d922d82Thomas Gleixner#include <asm/irq_vectors.h> 5740d2e76315da38993129090dc5d56377e573c312Brian Gerst#include <asm/cpufeature.h> 58b4ca46e4e82a0a5976fe5eab85be585d75f8202fAndy Lutomirski#include <asm/alternative-asm.h> 596837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin#include <asm/asm.h> 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 61af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ 62af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#include <linux/elf-em.h> 63af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 64af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define __AUDIT_ARCH_LE 0x40000000 65af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 66af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifndef CONFIG_AUDITSYSCALL 67af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysenter_audit syscall_trace_entry 68af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysexit_audit syscall_exit_work 69af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 70af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 71ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 72ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa 73139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell/* 74139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * We use macros for low-level operations which need to be overridden 75139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * for paravirtualization. The following will never clobber any registers: 76139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * INTERRUPT_RETURN (aka. "iret") 77139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") 78d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). 79139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * 80139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must 81139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). 82139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * Allowing a register to be clobbered can shrink the paravirt replacement 83139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * enough to patch inline, increasing performance. 84139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell */ 85139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 87139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 89139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) 902e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum#define resume_kernel restore_all 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.macro TRACE_IRQS_IRET 9455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#ifdef CONFIG_TRACE_IRQFLAGS 95ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? 9655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jz 1f 9755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 9855f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar1: 9955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#endif 10055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.endm 10155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar 102ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo/* 103ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * User gs save/restore 104ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 105ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * %gs is used for userland TLS and kernel only uses it for stack 106ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * canary which is required to be at %gs:20 by gcc. Read the comment 107ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * at the top of stackprotector.h for more info. 108ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 109ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * Local labels 98 and 99 are used. 110ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo */ 111ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#ifdef CONFIG_X86_32_LAZY_GS 112ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 113ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* unfortunately push/pop can't be no-op */ 114ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 115df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 116ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 117ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 118ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo addl $(4 + \pop), %esp 119ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -(4 + \pop) 120ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 121ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 122ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 123ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 124ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* all the rest are no-op */ 125ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 126ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 127ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 128ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 129ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 130ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 131ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 132ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 133ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 134ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 135ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 136ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#else /* CONFIG_X86_32_LAZY_GS */ 137ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 138ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 139df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %gs 140ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, 0*/ 141ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 142ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 143ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 144df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich98: popl_cfi %gs 145ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_RESTORE gs*/ 146ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .if \pop <> 0 147ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo add $\pop, %esp 148ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -\pop 149ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .endif 150ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 151ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 152ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 153ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, (%esp) 154ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 155ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 1566837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(98b,99b) 157ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 158ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 159ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 160ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo98: mov PT_GS(%esp), %gs 161ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 162ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 163ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 164ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, PT_GS(%esp) 165ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 166ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 1676837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(98b,99b) 168ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 169ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 170ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 171ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl %gs, \reg 172ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REGISTER gs, \reg*/ 173ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 174ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 175ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, PT_GS(%esp) 176ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, PT_GS*/ 177ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 178ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 17960a5317ff0f42dd313094b88f809f63041568b08Tejun Heo movl $(__KERNEL_STACK_CANARY), \reg 180ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, %gs 181ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 182ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 183ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#endif /* CONFIG_X86_32_LAZY_GS */ 184ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 185f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro SAVE_ALL 186f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cld 187ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PUSH_GS 188df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 189f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET fs, 0;*/ 190df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 191f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET es, 0;*/ 192df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 193f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET ds, 0;*/ 194df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 195f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET eax, 0 196df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 197f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebp, 0 198df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 199f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edi, 0 200df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 201f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET esi, 0 202df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 203f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edx, 0 204df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 205f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ecx, 0 206df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 207f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebx, 0 208f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__USER_DS), %edx 209f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %ds 210f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %es 211f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__KERNEL_PERCPU), %edx 212464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge movl %edx, %fs 213ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %edx 214f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 216f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RESTORE_INT_REGS 217df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebx 218f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebx 219df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 220f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ecx 221df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edx 222f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edx 223df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %esi 224f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE esi 225df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edi 226f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edi 227df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebp 228f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebp 229df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 230fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE eax 231f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 233ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro RESTORE_REGS pop=0 234f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo RESTORE_INT_REGS 235df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: popl_cfi %ds 236f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE ds;*/ 237df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich2: popl_cfi %es 238f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE es;*/ 239df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich3: popl_cfi %fs 240f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE fs;*/ 241ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS \pop 242f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.pushsection .fixup, "ax" 243f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo4: movl $0, (%esp) 244f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 1b 245f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo5: movl $0, (%esp) 246f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 2b 247f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo6: movl $0, (%esp) 248f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 3b 249f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 2506837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,4b) 2516837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(2b,5b) 2526837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(3b,6b) 253ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS_EX 254f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 256f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_INT_FRAME 257f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 258f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 259f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 3*4 260f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 261fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 262f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 263fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 264f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_EC_FRAME 265f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 266f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 267f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 4*4 268f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 269fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 270f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 271fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 272f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_PTREGS_FRAME 273f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 274f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 275f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, PT_OLDESP-PT_EBX 276f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ 277f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eip, PT_EIP-PT_OLDESP 278f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ 279f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ 280f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eax, PT_EAX-PT_OLDESP 281f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ebp, PT_EBP-PT_OLDESP 282f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edi, PT_EDI-PT_OLDESP 283f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET esi, PT_ESI-PT_OLDESP 284f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edx, PT_EDX-PT_OLDESP 285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ecx, PT_ECX-PT_OLDESP 286eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge CFI_OFFSET ebx, PT_EBX-PT_OLDESP 287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(ret_from_fork) 290fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC 291df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule_tail 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 294df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 295df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0x0202 # Reset kernel eflags 296df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popfl_cfi 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 298fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 29947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_fork) 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 302a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Interrupt exit functions should be protected against kprobes 303a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 304a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 305a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return to user mode is not as complex as all this looks, 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but we want the default path for a system call return to 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * go as quickly as possible which is why some of this is 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * less clear than it otherwise should be. 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # userspace resumption stub bypassing syscall exit tracing 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 314fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_exception: 316139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell preempt_stop(CLBR_ANY) 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_intr: 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 31929a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#ifdef CONFIG_VM86 320eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS 321eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 322ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax 32329a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#else 32429a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko /* 32529a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko * We can be coming here from a syscall done in the kernel space, 32629a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko * e.g. a failed kernel_execve(). 32729a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko */ 32829a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko movl PT_CS(%esp), %eax 32929a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko andl $SEGMENT_RPL_MASK, %eax 33029a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#endif 33178be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $USER_RPL, %eax 33278be3706b21a232310590fe00258b224177ac05fRusty Russell jb resume_kernel # not returning to v8086 or userspace 333f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_userspace) 335c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 336139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 339e32e58a96de4ac35a03349db2ab69f263ded958fPeter Zijlstra TRACE_IRQS_OFF 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done on 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # int/exception return? 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_pending 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp restore_all 34547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_exception) 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_kernel) 349139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? 3512e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jnz restore_all 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsneed_resched: 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx # need_resched set ? 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 356ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call preempt_schedule_irq 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp need_resched 36047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(resume_kernel) 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 362fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 363a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 364a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 365a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 366a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* SYSENTER_RETURN points to after the "sysenter" instruction in 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # sysenter call handler stub 3720aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENTRY(ia32_sysenter_target) 373fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC simple 374adf1423698f00d00b267f7dca8231340ce7d65efJan Beulich CFI_SIGNAL_FRAME 375fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_DEF_CFA esp, 0 376fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REGISTER esp, ebp 377faca62273b602ab482fb7d3d940dbf41ef08b00eH. Peter Anvin movl TSS_sysenter_sp0(%esp),%esp 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssysenter_past_esp: 37955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar /* 380d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * Interrupts are disabled here, but we can't trace it until 381d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * enough kernel state to call TRACE_IRQS_OFF can be called - but 382d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * we immediately enable interrupts at that point anyway. 38355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 3843234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_DS 385fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET ss, 0*/ 386df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 387fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET esp, 0 388df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 389d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge orl $X86_EFLAGS_IF, (%esp) 3903234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_CS 391fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET cs, 0*/ 392e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar /* 393e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * Push current_thread_info()->sysenter_return to the stack. 394e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * A tiny bit of offset fixup is necessary - 4*4 means the 4 words 395e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * pushed above; +8 corresponds to copy_thread's esp0 setting. 396e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar */ 3977bf04be8f48ceeeffa5b5a79734d6d6e0d59e5f8Stratos Psomadakis pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) 398fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET eip, 0 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 400df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 401d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge SAVE_ALL 402d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge ENABLE_INTERRUPTS(CLBR_NONE) 403d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Load the potential sixth argument from user stack. 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Careful about security. 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $__PAGE_OFFSET-3,%ebp 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_fault 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds1: movl (%ebp),%ebp 411d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge movl %ebp,PT_EBP(%esp) 4126837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,syscall_fault) 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 41688200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 417af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz sysenter_audit 418af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_do_call: 419303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 422eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) 423c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 42442c24fa22e86365055fc931d833f26165e687c19Jeremy Fitzhardinge DISABLE_INTERRUPTS(CLBR_ANY) 42555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 42788200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx 428af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne sysexit_audit 429af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_exit: 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* if something modifies registers it must also disable sysexit */ 431eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EIP(%esp), %edx 432eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_OLDESP(%esp), %ecx 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %ebp,%ebp 43455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 435464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge1: mov PT_FS(%esp), %fs 436ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS 437d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge ENABLE_INTERRUPTS_SYSEXIT 438af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 439af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifdef CONFIG_AUDITSYSCALL 440af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_audit: 44188200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) 442af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz syscall_trace_entry 443af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath addl $4,%esp 444af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath CFI_ADJUST_CFA_OFFSET -4 445af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ 446af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ 447af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ 448af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ 449af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* 2nd arg: syscall number */ 450af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ 451b05d8447e7821695bc2fa3359431f7a664232743Eric Paris call __audit_syscall_entry 452df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 453af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall number */ 454af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_do_call 455af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 456af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysexit_audit: 45788200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 458af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 459af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_ON 460af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath ENABLE_INTERRUPTS(CLBR_ANY) 461af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* second arg, syscall return value */ 462d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris cmpl $-MAX_ERRNO,%eax /* is it an error ? */ 463d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris setbe %al /* 1 if so, 0 if not */ 464af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movzbl %al,%eax /* zero-extend that */ 465d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris call __audit_syscall_exit 466af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath DISABLE_INTERRUPTS(CLBR_ANY) 467af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_OFF 468af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl TI_flags(%ebp), %ecx 46988200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 470af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 471af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall return value */ 472af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_exit 473af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 474af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 475fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 476f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.pushsection .fixup,"ax" 477464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge2: movl $0,PT_FS(%esp) 478f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge jmp 1b 479f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 4806837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,2b) 481ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS_EX 4820aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENDPROC(ia32_sysenter_target) 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 484a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 485a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * syscall stub including irq exit should be protected against kprobes 486a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 487a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # system call handler stub 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(system_call) 490fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 491df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax # save orig_eax 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 494ed75e8d58010fdc06e2c3a81bfbebae92314c7e3Laurent Vivier # system call tracing in operation / emulation 49588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz syscall_trace_entry 497303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_call: 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 501eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) # store the return value 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit: 503c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 504139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 50755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 50988200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx # current->work 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne syscall_exit_work 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_all: 5132e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum TRACE_IRQS_IRET 5142e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelumrestore_all_notrace: 515eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS 516eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge # Warning: PT_OLDSS(%esp) contains the wrong/random values if we 5175df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # are returning to the kernel. 5185df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # See comments in process.c:copy_thread() for details. 519eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_OLDSS(%esp), %ah 520eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 521ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax 52278be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax 523fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REMEMBER_STATE 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds je ldt_ss # returning to user-space with LDT SS 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_nocheck: 526ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo RESTORE_REGS 4 # skip orig_eax/error_code 527f7f3d791e61d7baf8b0aee0384fdd469c0d2ac9bAdrian Bunkirq_return: 5283701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar INTERRUPT_RETURN 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section .fixup,"ax" 53090e9f53662826db3cdd6d99bd394d727b05160c1Jeremy FitzhardingeENTRY(iret_exc) 531a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $0 # no error code 532a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $do_iret_error 533a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds jmp error_code 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5356837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(irq_return,iret_exc) 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 537fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE_STATE 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsldt_ss: 539eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge larl PT_OLDSS(%esp), %eax 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testl $0x00400000, %eax # returning to 32bit stack? 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck # allright, normal return 543d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 544d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 545d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell /* 546d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * The kernel can't run on a non-flat stack if paravirt mode 547d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is active. Rather than try to fixup the high bits of 548d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * ESP, bypass this code entirely. This may break DOSemu 549d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * and/or Wine support in a paravirt VM, although the option 550d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is still available to implement the setting of the high 551d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * 16-bits in the INTERRUPT_RETURN paravirt-op. 552d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell */ 55393b1eab3d29e7ea32ee583de3362da84db06ded8Jeremy Fitzhardinge cmpl $0, pv_info+PARAVIRT_enabled 554d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell jne restore_nocheck 555d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 556d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 557dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 558dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Setup and switch to ESPFIX stack 559dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 560dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We're returning to userspace with a 16 bit stack. The CPU will not 561dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * restore the high word of ESP for us on executing iret... This is an 562dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * "official" bug of all the x86-compatible CPUs, which we can work 563dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * around to make dosemu and wine happy. We do this by preloading the 564dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * high word of ESP with the high word of the userspace ESP while 565dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * compensating for the offset by changing to the ESPFIX segment with 566dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * a base address that matches for the difference. 567dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 56872c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) 569dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %esp, %edx /* load kernel esp */ 570dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov PT_OLDESP(%esp), %eax /* load userspace esp */ 571dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %dx, %ax /* eax: new kernel esp */ 572dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum sub %eax, %edx /* offset (low word is 0) */ 573dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shr $16, %edx 57472c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ 57572c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ 576df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__ESPFIX_SS 577df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax /* new kernel esp */ 5782e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum /* Disable interrupts, but do not irqtrace this section: we 5792e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * will soon execute iret and the tracer was already set to 5802e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * the irqstate after the iret */ 581139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_EAX) 582dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to espfix segment */ 583be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev CFI_ADJUST_CFA_OFFSET -8 584be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev jmp restore_nocheck 585fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 58647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(system_call) 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform work that needs to be done immediately before resumption 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 590fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME # can't unwind into user space anyway 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_pending: 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_notifysig 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_resched: 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule 596c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 597139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 60055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done other 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # than syscall tracing? 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz work_resched 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig: # deal with pending signals and 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # notify-resume requests 61074b47a7844501445d41d704fe7c626f4b1819508Joe Korty#ifdef CONFIG_VM86 611ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_notifysig_v86 # returning to kernel-space or 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # vm86-space 6153596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju TRACE_IRQS_ON 6163596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju ENABLE_INTERRUPTS(CLBR_NONE) 61744fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro movb PT_CS(%esp), %bl 61844fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro andb $SEGMENT_RPL_MASK, %bl 61944fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro cmpb $USER_RPL, %bl 62044fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jb resume_kernel 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 62344fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jmp resume_userspace 6241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig_v86: 627df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx # save ti_flags for do_notify_resume 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call save_v86_state # %eax contains pt_regs pointer 629df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %eax, %esp 63174b47a7844501445d41d704fe7c626f4b1819508Joe Korty#else 63274b47a7844501445d41d704fe7c626f4b1819508Joe Korty movl %esp, %eax 63374b47a7844501445d41d704fe7c626f4b1819508Joe Korty#endif 6343596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju TRACE_IRQS_ON 6353596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju ENABLE_INTERRUPTS(CLBR_NONE) 63644fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro movb PT_CS(%esp), %bl 63744fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro andb $SEGMENT_RPL_MASK, %bl 63844fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro cmpb $USER_RPL, %bl 63944fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jb resume_kernel 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 64244fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jmp resume_userspace 64347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(work_pending) 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_trace_entry: 648eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 650d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_enter 651d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath /* What it returned is what we'll actually use. */ 652303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnae syscall_call 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 65547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_trace_entry) 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit_work: 66088200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_EXIT, %ecx 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_pending 66255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 663d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # schedule() instead 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 666d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_leave 6671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 66847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_exit_work) 669fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 6701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 671fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_fault: 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 674eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-EFAULT,PT_EAX(%esp) 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 67647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_fault) 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_badsys: 679eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 68147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_badsys) 682fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 683a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 684a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 685a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 686a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 688253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst/* 689253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst * System calls that need a pt_regs pointer. 690253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst */ 691e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL0(name) \ 692303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENTRY(ptregs_##name) ; \ 693253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst leal 4(%esp),%eax; \ 694303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin jmp sys_##name; \ 695303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENDPROC(ptregs_##name) 696253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 697e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL1(name) \ 698303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENTRY(ptregs_##name) ; \ 699e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%edx; \ 700ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 701303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin jmp sys_##name; \ 702303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENDPROC(ptregs_##name) 703e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 704e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL2(name) \ 705303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENTRY(ptregs_##name) ; \ 706e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%ecx; \ 707ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_ECX+4)(%esp),%edx; \ 708ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 709303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin jmp sys_##name; \ 710303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENDPROC(ptregs_##name) 711e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 712e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL3(name) \ 713303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENTRY(ptregs_##name) ; \ 714a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC; \ 715e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%eax; \ 716a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax; \ 717e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EDX(%eax),%ecx; \ 718e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_ECX(%eax),%edx; \ 719e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EBX(%eax),%eax; \ 720e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst call sys_##name; \ 721e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst addl $4,%esp; \ 722a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -4; \ 723a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich ret; \ 724a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC; \ 725a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_##name) 726e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 72727f59559d63375a4d59e7c720a439d9f0b47edadBrian GerstPTREGSCALL1(iopl) 728e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(fork) 729e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(vfork) 73011cf88bd0b8165b65aaabaee0977e9a3ad474ab7Brian GerstPTREGSCALL3(execve) 731052acad48a566a6dbcccb95e5d22e5e1b7cac8ddBrian GerstPTREGSCALL2(sigaltstack) 732e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(sigreturn) 733e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(rt_sigreturn) 734f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL2(vm86) 735f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL1(vm86old) 736253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 737f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst/* Clone is an oddball. The 4th arg is in %edi */ 738303395ac3bf3e2cb488435537d416bc840438fcbH. Peter AnvinENTRY(ptregs_clone) 739a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC 740f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst leal 4(%esp),%eax 741a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax 742a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi PT_EDI(%eax) 743f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EDX(%eax),%ecx 744f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_ECX(%eax),%edx 745f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EBX(%eax),%eax 746f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst call sys_clone 747f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst addl $8,%esp 748a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -8 749f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst ret 750a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC 751a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_clone) 752f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst 753f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIXUP_ESPFIX_STACK 754dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 755dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Switch back for ESPFIX stack to the normal zerobased stack 756dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 757dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We can't call C functions using the ESPFIX stack. This code reads 758dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * the high word of the segment base from the GDT and swiches to the 759dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * normal stack and adjusts ESP with the matching offset. 760dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 761dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum /* fixup the stack */ 76272c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ 76372c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ 764dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shl $16, %eax 765dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum addl %esp, %eax /* the adjusted stack pointer */ 766df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_DS 767df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 768dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to the normal stack segment */ 769f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_ADJUST_CFA_OFFSET -8 770f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 771f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro UNWIND_ESPFIX_STACK 772f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %ss, %eax 773f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* see if on espfix stack */ 774f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__ESPFIX_SS, %ax 775f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne 27f 776f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $__KERNEL_DS, %eax 777f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %ds 778f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %es 779f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* switch to normal stack */ 780f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIXUP_ESPFIX_STACK 781f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo27: 782f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 785b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * Build the entry stubs and pointer table with some assembler magic. 786b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * We pack 7 stubs into a single 32-byte chunk, which will fit in a 787b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * single cache line on all modern x86 implementations. 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7894687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvin.section .init.rodata,"a" 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(interrupt) 791ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa.section .entry.text, "ax" 792b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align 5 793b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(irq_entries_start) 795fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 7964687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvinvector=FIRST_EXTERNAL_VECTOR 797b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin.rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 798b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .balign 32 799b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .rept 7 800b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .if vector < NR_VECTORS 8018665596ec05498525014436520b316ba174a068aH. Peter Anvin .if vector <> FIRST_EXTERNAL_VECTOR 802fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ADJUST_CFA_OFFSET -4 803b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 804df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ 8058665596ec05498525014436520b316ba174a068aH. Peter Anvin .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 806b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin jmp 2f 807b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 808b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .previous 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b 810ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvector=vector+1 812b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 813b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endr 814b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin2: jmp common_interrupt 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.endr 81647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(irq_entries_start) 81747a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich 81847a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 81947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(interrupt) 82047a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 82255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar/* 82355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * the CPU automatically disables interrupts when executing an IRQ vector, 82455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * so IRQ-flags tracing has to follow that: 82555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 826b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldscommon_interrupt: 828b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 83055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_IRQ 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp ret_from_intr 83447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(common_interrupt) 835fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 837a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 838a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Irq entries should be protected against kprobes 839a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 840a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 84102cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT3(name, nr, fn) \ 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(name) \ 843fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME; \ 844df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $~(nr); \ 845fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich SAVE_ALL; \ 84655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF \ 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax; \ 84802cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo call fn; \ 84955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jmp ret_from_intr; \ 85047a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich CFI_ENDPROC; \ 85147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(name) 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 85302cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) 85402cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* The include is where all of the SMP etc. interrupts come from */ 8561164dd0099c0d79146a55319670f57ab7ad1d352Ingo Molnar#include <asm/entry_arch.h> 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_error) 859fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 860df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 861df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_error 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 863fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 86447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_error) 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(simd_coprocessor_error) 867fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 868df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 86940d2e76315da38993129090dc5d56377e573c312Brian Gerst#ifdef CONFIG_X86_INVD_BUG 87040d2e76315da38993129090dc5d56377e573c312Brian Gerst /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ 871df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich661: pushl_cfi $do_general_protection 87240d2e76315da38993129090dc5d56377e573c312Brian Gerst662: 87340d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstructions,"a" 874b4ca46e4e82a0a5976fe5eab85be585d75f8202fAndy Lutomirski altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f 87540d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 87640d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstr_replacement,"ax" 87740d2e76315da38993129090dc5d56377e573c312Brian Gerst663: pushl $do_simd_coprocessor_error 87840d2e76315da38993129090dc5d56377e573c312Brian Gerst664: 87940d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 88040d2e76315da38993129090dc5d56377e573c312Brian Gerst#else 881df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_simd_coprocessor_error 88240d2e76315da38993129090dc5d56377e573c312Brian Gerst#endif 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 884fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 88547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(simd_coprocessor_error) 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(device_not_available) 888fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 889df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 890df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_device_not_available 8917643e9b936b4af31ba4851eb7d5b3a3bfad52502Alexander van Heukelum jmp error_code 892fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(device_not_available) 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 895d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 896d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty RussellENTRY(native_iret) 8973701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar iret 8986837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(native_iret, iret_exc) 89947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(native_iret) 900d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 901d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeENTRY(native_irq_enable_sysexit) 902d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sti 903d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sysexit 904d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeEND(native_irq_enable_sysexit) 905d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 906d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(overflow) 908fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 909df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 910df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_overflow 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 912fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 91347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(overflow) 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(bounds) 916fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 917df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 918df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_bounds 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 920fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(bounds) 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_op) 924fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 925df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 926df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_op 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 928fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_op) 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_segment_overrun) 932fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 933df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 934df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_segment_overrun 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 936fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 93747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_segment_overrun) 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_TSS) 940fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 941df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_TSS 9421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 943fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 94447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_TSS) 9451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(segment_not_present) 947fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 948df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_segment_not_present 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 950fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(segment_not_present) 9521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(stack_segment) 954fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 955df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_stack_segment 9561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 957fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(stack_segment) 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(alignment_check) 961fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 962df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_alignment_check 9631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 964fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 96547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(alignment_check) 9661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 967d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.PENTRY(divide_error) 968d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.P RING0_INT_FRAME 969df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 # no error code 970df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_divide_error 9711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 972fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 97347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(divide_error) 9741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_X86_MCE 9761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(machine_check) 977fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 978df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 979df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi machine_check_vector 9801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 981fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 98247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(machine_check) 9831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(spurious_interrupt_bug) 986fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 987df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 988df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_spurious_interrupt_bug 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 990fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 99147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(spurious_interrupt_bug) 992a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 993a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 994a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 995a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 99702ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENTRY(kernel_thread_helper) 99802ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen pushl $0 # fake return address for unwinder 99902ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_STARTPROC 1000e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst movl %edi,%eax 1001e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst call *%esi 100202ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen call do_exit 10035f5db591326779a80cfe490c5d6b6ce9fac08b31jia zhang ud2 # padding for call trace 100402ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_ENDPROC 100502ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENDPROC(kernel_thread_helper) 100602ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen 10075ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#ifdef CONFIG_XEN 1008e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge/* Xen doesn't set %esp to be precisely what the normal sysenter 1009e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge entrypoint expects, so fix it up before using the normal path. */ 1010e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_sysenter_target) 1011e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge RING0_INT_FRAME 1012e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge addl $5*4, %esp /* remove xen-provided frame */ 10132ddf9b7b3e6660199269e34cfa27148440ddc3bfJan Beulich CFI_ADJUST_CFA_OFFSET -5*4 1014e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge jmp sysenter_past_esp 1015557d7d4e294ee6fb1db0cb6c1ec97a1c908b880dGlauber Costa CFI_ENDPROC 1016e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 10175ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_hypervisor_callback) 10185ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1019df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 10205ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10215ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge TRACE_IRQS_OFF 10229ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10239ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge /* Check to see if we got the event in the critical 10249ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge region in xen_iret_direct, after we've reenabled 10259ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge events and checked for pending events. This simulates 10269ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge iret instruction's behaviour where it delivers a 10279ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge pending interrupt when enabling interrupts. */ 10289ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge movl PT_EIP(%esp),%eax 10299ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_start_crit,%eax 10309ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jb 1f 10319ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_end_crit,%eax 10329ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jae 1f 10339ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10340f2c87695219b1129ccf93e0f58acdcdd49724b9Jeremy Fitzhardinge jmp xen_iret_crit_fixup 1035e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 1036e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_do_upcall) 1037b77797fb2bf31bf076e6b69736119bc6a077525bJeremy Fitzhardinge1: mov %esp, %eax 10385ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge call xen_evtchn_do_upcall 10395ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_intr 10405ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10415ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_hypervisor_callback) 10425ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10435ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Hypervisor uses this for application faults while it executes. 10445ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We get here for two reasons: 10455ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 1. Fault while reloading DS, ES, FS or GS 10465ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 2. Fault while executing IRET 10475ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 1 we fix up by reattempting the load, and zeroing the segment 10485ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# register if the load fails. 10495ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 2 we fix up by jumping to do_iret_error. We cannot use the 10505ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# normal Linux return path in this case because if we use the IRET hypercall 10515ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# to pop the stack frame we end up in an infinite loop of failsafe callbacks. 10525ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We distinguish between categories by maintaining a status value in EAX. 10535ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_failsafe_callback) 10545ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1055df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 10565ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl $1,%eax 10575ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge1: mov 4(%esp),%ds 10585ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge2: mov 8(%esp),%es 10595ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge3: mov 12(%esp),%fs 10605ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge4: mov 16(%esp),%gs 10615ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge testl %eax,%eax 1062df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 10635ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge lea 16(%esp),%esp 10645ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ADJUST_CFA_OFFSET -16 10655ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jz 5f 10665ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge addl $16,%esp 10675ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) 1068df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich5: pushl_cfi $0 # EAX == 0 => Category 1 (Bad segment) 10695ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10705ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_exception 10715ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10725ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10735ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section .fixup,"ax" 10745ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge6: xorl %eax,%eax 10755ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,4(%esp) 10765ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 1b 10775ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge7: xorl %eax,%eax 10785ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,8(%esp) 10795ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 2b 10805ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge8: xorl %eax,%eax 10815ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,12(%esp) 10825ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 3b 10835ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge9: xorl %eax,%eax 10845ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,16(%esp) 10855ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 4b 10865ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 10876837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,6b) 10886837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(2b,7b) 10896837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(3b,8b) 10906837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(4b,9b) 10915ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_failsafe_callback) 10925ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 109338e20b07efd541a959de367dc90a17f92ce2e8a6Sheng YangBUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, 109438e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang xen_evtchn_do_upcall) 109538e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang 10965ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#endif /* CONFIG_XEN */ 10975ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 1098606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#ifdef CONFIG_FUNCTION_TRACER 1099d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#ifdef CONFIG_DYNAMIC_FTRACE 1100d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1101d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(mcount) 1102d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1103d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(mcount) 1104d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1105d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(ftrace_caller) 110660a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 110760a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 110860a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 1109d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %eax 1110d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %ecx 1111d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %edx 111208f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt pushl $0 /* Pass NULL as regs pointer */ 111308f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt movl 4*4(%esp), %eax 1114d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0x4(%ebp), %edx 111528fb5dfa783c25dbeeb25a72663f8066a3a517f5Steven Rostedt leal function_trace_op, %ecx 1116395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 1117d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1118d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_call 1119d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_call: 1120d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call ftrace_stub 1121d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 112208f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt addl $4,%esp /* skip NULL pointer */ 1123d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %edx 1124d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %ecx 1125d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %eax 11264de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedtftrace_ret: 11275a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#ifdef CONFIG_FUNCTION_GRAPH_TRACER 11285a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt.globl ftrace_graph_call 11295a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedtftrace_graph_call: 11305a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt jmp ftrace_stub 11315a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#endif 1132d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1133d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_stub 1134d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_stub: 1135d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1136d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(ftrace_caller) 1137d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 11384de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven RostedtENTRY(ftrace_regs_caller) 11394de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushf /* push flags before compare (in cs location) */ 11404de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt cmpl $0, function_trace_stop 11414de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt jne ftrace_restore_flags 11424de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11434de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt /* 11444de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * i386 does not save SS and ESP when coming from kernel. 11454de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * Instead, to get sp, ®s->sp is used (see ptrace.h). 11464de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * Unfortunately, that means eflags must be at the same location 11474de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * as the current return ip is. We move the return ip into the 11484de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * ip location, and move flags into the return ip location. 11494de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt */ 11504de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl 4(%esp) /* save return ip into ip slot */ 11514de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11524de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl $0 /* Load 0 into orig_ax */ 11534de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %gs 11544de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %fs 11554de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %es 11564de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ds 11574de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %eax 11584de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ebp 11594de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %edi 11604de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %esi 11614de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %edx 11624de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ecx 11634de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ebx 11644de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11654de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 13*4(%esp), %eax /* Get the saved flags */ 11664de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 14*4(%esp) /* Move saved flags into regs->flags location */ 11674de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt /* clobbering return ip */ 11684de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl $__KERNEL_CS,13*4(%esp) 11694de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11704de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 12*4(%esp), %eax /* Load ip (1st parameter) */ 1171a5e37863ab31d78faddff15675c89979792bc0bdMasami Hiramatsu subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */ 1172e4ea3f6b1bf3d489674a3660db652636e50186f9Uros Bizjak movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ 11734de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ 1174e4ea3f6b1bf3d489674a3660db652636e50186f9Uros Bizjak pushl %esp /* Save pt_regs as 4th parameter */ 11754de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11764de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven RostedtGLOBAL(ftrace_regs_call) 11774de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt call ftrace_stub 11784de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11794de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt addl $4, %esp /* Skip pt_regs */ 11804de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 14*4(%esp), %eax /* Move flags back into cs */ 11814de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 13*4(%esp) /* Needed to keep addl from modifying flags */ 11824de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 12*4(%esp), %eax /* Get return ip from regs->ip */ 11834de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 14*4(%esp) /* Put return ip back for ret */ 11844de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11854de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ebx 11864de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ecx 11874de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %edx 11884de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %esi 11894de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %edi 11904de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ebp 11914de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %eax 11924de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ds 11934de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %es 11944de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %fs 11954de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %gs 11964de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt addl $8, %esp /* Skip orig_ax and ip */ 11974de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popf /* Pop flags at end (no addl to corrupt flags) */ 11984de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt jmp ftrace_ret 11994de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 12004de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedtftrace_restore_flags: 12014de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popf 12024de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt jmp ftrace_stub 1203d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#else /* ! CONFIG_DYNAMIC_FTRACE */ 1204d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 120516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloENTRY(mcount) 120660a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 120760a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 120860a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 120916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo cmpl $ftrace_stub, ftrace_trace_function 121016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jnz trace 1211fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1212c2324b694fa8ffee382a124198c68754088e483cIngo Molnar cmpl $ftrace_stub, ftrace_graph_return 1213fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker jnz ftrace_graph_caller 1214e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt 1215e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt cmpl $ftrace_graph_entry_stub, ftrace_graph_entry 1216e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt jnz ftrace_graph_caller 1217caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker#endif 121816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo.globl ftrace_stub 121916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Meloftrace_stub: 122016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo ret 122116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 122216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo /* taken from glibc */ 122316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melotrace: 122416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %eax 122516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %ecx 122616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %edx 122716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0xc(%esp), %eax 122816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0x4(%ebp), %edx 1229395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 123016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1231d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call *ftrace_trace_function 123216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 123316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %edx 123416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %ecx 123516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %eax 123616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jmp ftrace_stub 123716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloEND(mcount) 1238d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#endif /* CONFIG_DYNAMIC_FTRACE */ 1239606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 124016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1241fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1242fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerENTRY(ftrace_graph_caller) 1243caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1244caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %ecx 1245caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 12461dc1c6adf38bc5799d1594681645ced40ced4b6bFrederic Weisbecker movl 0xc(%esp), %edx 1247caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker lea 0x4(%ebp), %eax 124871e308a239c098673570d0b417d42262bb535909Steven Rostedt movl (%ebp), %ecx 1249bb4304c71c97bf727ec43cd2f195c2c237c27fd3Steven Rostedt subl $MCOUNT_INSN_SIZE, %edx 1250caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call prepare_ftrace_return 1251caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1252caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %ecx 1253caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1254e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker ret 1255fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerEND(ftrace_graph_caller) 1256caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker 1257caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker.globl return_to_handler 1258caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbeckerreturn_to_handler: 1259caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1260caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 126171e308a239c098673570d0b417d42262bb535909Steven Rostedt movl %ebp, %eax 1262caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call ftrace_return_to_handler 1263194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt movl %eax, %ecx 1264caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1265caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1266194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt jmp *%ecx 1267e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker#endif 126816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1269d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1270d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Some functions should be protected against kprobes 1271d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1272d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .pushsection .kprobes.text, "ax" 1273d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1274d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(page_fault) 1275d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1276df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_page_fault 1277d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ALIGN 1278d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumerror_code: 1279ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* the function address is in %gs's slot on the stack */ 1280df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 1281ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET fs, 0*/ 1282df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 1283d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET es, 0*/ 1284df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 1285d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET ds, 0*/ 1286df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1287d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eax, 0 1288df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 1289d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebp, 0 1290df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 1291d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edi, 0 1292df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 1293d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET esi, 0 1294df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 1295d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edx, 0 1296df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 1297d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ecx, 0 1298df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 1299d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebx, 0 1300d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cld 1301d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__KERNEL_PERCPU), %ecx 1302d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %fs 1303d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum UNWIND_ESPFIX_STACK 1304ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo GS_TO_REG %ecx 1305ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl PT_GS(%esp), %edi # get the function address 1306d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl PT_ORIG_EAX(%esp), %edx # get the error code 1307d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart 1308ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo REG_TO_PTGS %ecx 1309ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %ecx 1310d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__USER_DS), %ecx 1311d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %ds 1312d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %es 1313d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1314d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1315d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call *%edi 1316d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1317d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1318d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(page_fault) 1319d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1320d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1321d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Debug traps and NMI can happen at the one SYSENTER instruction 1322d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * that sets up the real kernel stack. Check here, since we can't 1323d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * allow the wrong stack to be used. 1324d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1325d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have 1326d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * already pushed 3 words if it hits on the sysenter instruction: 1327d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * eflags, cs and eip. 1328d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1329d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * We just load the right stack, and push the three (known) values 1330d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * by hand onto the new stack - while updating the return eip past 1331d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * the instruction that would have done it for sysenter. 1332d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1333f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIX_STACK offset ok label 1334f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__KERNEL_CS, 4(%esp) 1335f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne \ok 1336f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo\label: 1337f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl TSS_sysenter_sp0 + \offset(%esp), %esp 1338f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 0 1339f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_UNDEFINED eip 1340df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 1341df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_CS 1342df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $sysenter_past_esp 1343d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eip, 0 1344f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 1345d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1346d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(debug) 1347d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1348d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1349d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne debug_stack_correct 1350f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn 1351d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumdebug_stack_correct: 1352df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1353d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1354d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1355d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # error code 0 1356d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1357d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_debug 1358d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1359d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1360d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(debug) 1361d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1362d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1363d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI is doubly nasty. It can happen _while_ we're handling 1364d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * a debug fault, and the debug fault hasn't yet been able to 1365d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * clear up the stack. So we first check whether we got an 1366d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI on the sysenter entry path, but after that we need to 1367d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * check whether we got an NMI on the debug path where the debug 1368d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * fault happened on the sysenter path. 1369d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1370d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(nmi) 1371d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1372df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1373d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ss, %eax 1374d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__ESPFIX_SS, %ax 1375df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1376d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_espfix_stack 1377d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1378d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_stack_fixup 1379df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1380d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax 1381d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* Do not access memory above the end of our stack page, 1382d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * it might not exist. 1383d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1384d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum andl $(THREAD_SIZE-1),%eax 1385d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $(THREAD_SIZE-20),%eax 1386df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1387d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jae nmi_stack_correct 1388d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,12(%esp) 1389d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_debug_stack_check 1390d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_correct: 1391d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1392df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1393d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1394d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1395d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1396d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 13972e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jmp restore_all_notrace 1398d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1399d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1400d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_fixup: 1401d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1402f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, nmi_stack_correct, 1 1403d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1404d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1405d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_debug_stack_check: 1406d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1407d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__KERNEL_CS,16(%esp) 1408d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne nmi_stack_correct 1409d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug,(%esp) 1410d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jb nmi_stack_correct 1411d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug_esp_fix_insn,(%esp) 1412d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ja nmi_stack_correct 1413f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 24, nmi_stack_correct, 1 1414d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1415d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1416d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_espfix_stack: 1417d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here. 1418d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1419d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * create the pointer to lss back 1420d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1421df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ss 1422df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esp 1423bda3a89745d7bb88d3e735046c0cdc3d0eb2ac24Stas Sergeev addl $4, (%esp) 1424d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* copy the iret frame of 12 bytes */ 1425d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .rept 3 1426df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi 16(%esp) 1427d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .endr 1428df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1429d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1430d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum FIXUP_ESPFIX_STACK # %eax == %esp 1431d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1432d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 1433d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RESTORE_REGS 1434d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum lss 12+4(%esp), %esp # back to espfix stack 1435d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ADJUST_CFA_OFFSET -24 1436d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp irq_return 1437d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1438d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(nmi) 1439d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1440d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(int3) 1441d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1442df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1443d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1444d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1445d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1446d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1447d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_int3 1448d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1449d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1450d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(int3) 1451d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1452d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(general_protection) 1453d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1454df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_general_protection 1455d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp error_code 1456d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1457d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(general_protection) 1458d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1459631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#ifdef CONFIG_KVM_GUEST 1460631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb NatapovENTRY(async_page_fault) 1461631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov RING0_EC_FRAME 146260cf637a13932a4750da6746efd0199e8a4c341bJan Beulich pushl_cfi $do_async_page_fault 1463631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov jmp error_code 1464631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov CFI_ENDPROC 14652ae9d293b14d17f35eff624272cfecac7979a2eeSedat DilekEND(async_page_fault) 1466631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#endif 1467631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov 1468d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1469d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * End of kprobes section 1470d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1471d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .popsection 1472