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> 60e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin#include <asm/smap.h> 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 62af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ 63af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#include <linux/elf-em.h> 64af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 65af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define __AUDIT_ARCH_LE 0x40000000 66af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 67af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifndef CONFIG_AUDITSYSCALL 68af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysenter_audit syscall_trace_entry 69af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysexit_audit syscall_exit_work 70af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 71af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 72ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 73ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa 74139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell/* 75139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * We use macros for low-level operations which need to be overridden 76139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * for paravirtualization. The following will never clobber any registers: 77139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * INTERRUPT_RETURN (aka. "iret") 78139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") 79d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). 80139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * 81139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must 82139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). 83139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * Allowing a register to be clobbered can shrink the paravirt replacement 84139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * enough to patch inline, increasing performance. 85139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell */ 86139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 88139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 90139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) 912e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum#define resume_kernel restore_all 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.macro TRACE_IRQS_IRET 9555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#ifdef CONFIG_TRACE_IRQFLAGS 96ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? 9755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jz 1f 9855f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 9955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar1: 10055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#endif 10155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.endm 10255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar 103ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo/* 104ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * User gs save/restore 105ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 106ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * %gs is used for userland TLS and kernel only uses it for stack 107ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * canary which is required to be at %gs:20 by gcc. Read the comment 108ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * at the top of stackprotector.h for more info. 109ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 110ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * Local labels 98 and 99 are used. 111ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo */ 112ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#ifdef CONFIG_X86_32_LAZY_GS 113ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 114ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* unfortunately push/pop can't be no-op */ 115ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 116df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 117ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 118ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 119ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo addl $(4 + \pop), %esp 120ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -(4 + \pop) 121ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 122ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 123ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 124ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 125ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* all the rest are no-op */ 126ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 127ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 128ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 129ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 130ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 131ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 132ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 133ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 134ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 135ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 136ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 137ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#else /* CONFIG_X86_32_LAZY_GS */ 138ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 139ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 140df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %gs 141ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, 0*/ 142ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 143ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 144ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 145df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich98: popl_cfi %gs 146ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_RESTORE gs*/ 147ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .if \pop <> 0 148ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo add $\pop, %esp 149ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -\pop 150ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .endif 151ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 152ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 153ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 154ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, (%esp) 155ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 156ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 1576837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(98b,99b) 158ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 159ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 160ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 161ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo98: mov PT_GS(%esp), %gs 162ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 163ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 164ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 165ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, PT_GS(%esp) 166ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 167ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 1686837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(98b,99b) 169ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 170ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 171ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 172ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl %gs, \reg 173ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REGISTER gs, \reg*/ 174ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 175ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 176ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, PT_GS(%esp) 177ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, PT_GS*/ 178ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 179ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 18060a5317ff0f42dd313094b88f809f63041568b08Tejun Heo movl $(__KERNEL_STACK_CANARY), \reg 181ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, %gs 182ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 183ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 184ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#endif /* CONFIG_X86_32_LAZY_GS */ 185ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 186f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro SAVE_ALL 187f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cld 188ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PUSH_GS 189df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 190f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET fs, 0;*/ 191df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 192f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET es, 0;*/ 193df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 194f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET ds, 0;*/ 195df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 196f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET eax, 0 197df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 198f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebp, 0 199df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 200f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edi, 0 201df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 202f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET esi, 0 203df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 204f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edx, 0 205df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 206f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ecx, 0 207df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 208f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebx, 0 209f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__USER_DS), %edx 210f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %ds 211f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %es 212f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__KERNEL_PERCPU), %edx 213464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge movl %edx, %fs 214ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %edx 215f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 217f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RESTORE_INT_REGS 218df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebx 219f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebx 220df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 221f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ecx 222df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edx 223f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edx 224df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %esi 225f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE esi 226df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edi 227f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edi 228df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebp 229f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebp 230df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 231fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE eax 232f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 234ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro RESTORE_REGS pop=0 235f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo RESTORE_INT_REGS 236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: popl_cfi %ds 237f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE ds;*/ 238df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich2: popl_cfi %es 239f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE es;*/ 240df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich3: popl_cfi %fs 241f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE fs;*/ 242ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS \pop 243f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.pushsection .fixup, "ax" 244f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo4: movl $0, (%esp) 245f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 1b 246f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo5: movl $0, (%esp) 247f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 2b 248f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo6: movl $0, (%esp) 249f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 3b 250f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 2516837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,4b) 2526837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(2b,5b) 2536837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(3b,6b) 254ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS_EX 255f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 257f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_INT_FRAME 258f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 259f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 260f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 3*4 261f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 262fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 263f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 264fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 265f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_EC_FRAME 266f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 267f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 268f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 4*4 269f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 270fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 271f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 272fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 273f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_PTREGS_FRAME 274f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 275f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 276f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, PT_OLDESP-PT_EBX 277f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ 278f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eip, PT_EIP-PT_OLDESP 279f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ 280f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ 281f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eax, PT_EAX-PT_OLDESP 282f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ebp, PT_EBP-PT_OLDESP 283f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edi, PT_EDI-PT_OLDESP 284f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET esi, PT_ESI-PT_OLDESP 285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edx, PT_EDX-PT_OLDESP 286f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ecx, PT_ECX-PT_OLDESP 287eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge CFI_OFFSET ebx, PT_EBX-PT_OLDESP 288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(ret_from_fork) 291fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC 292df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule_tail 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 295df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 296df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0x0202 # Reset kernel eflags 297df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popfl_cfi 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 299fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 30047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_fork) 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 30222e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al ViroENTRY(ret_from_kernel_thread) 30322e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro CFI_STARTPROC 30422e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro pushl_cfi %eax 30522e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro call schedule_tail 3066783eaa2e1253fbcbe2c2f6bb4c843abf1343cafAl Viro GET_THREAD_INFO(%ebp) 30722e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro popl_cfi %eax 30822e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro pushl_cfi $0x0202 # Reset kernel eflags 30922e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro popfl_cfi 31022e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro movl PT_EBP(%esp),%eax 31122e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro call *PT_EBX(%esp) 31222e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro movl $0,PT_EAX(%esp) 3136783eaa2e1253fbcbe2c2f6bb4c843abf1343cafAl Viro jmp syscall_exit 31422e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al Viro CFI_ENDPROC 31522e2430d60dbdfcdd732a086e9ef2dbd74c266d1Al ViroENDPROC(ret_from_kernel_thread) 3166783eaa2e1253fbcbe2c2f6bb4c843abf1343cafAl Viro 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return to user mode is not as complex as all this looks, 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but we want the default path for a system call return to 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * go as quickly as possible which is why some of this is 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * less clear than it otherwise should be. 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # userspace resumption stub bypassing syscall exit tracing 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 326fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_exception: 328139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell preempt_stop(CLBR_ANY) 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_intr: 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 33129a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#ifdef CONFIG_VM86 332eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS 333eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 334ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax 33529a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#else 33629a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko /* 3376783eaa2e1253fbcbe2c2f6bb4c843abf1343cafAl Viro * We can be coming here from child spawned by kernel_thread(). 33829a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko */ 33929a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko movl PT_CS(%esp), %eax 34029a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko andl $SEGMENT_RPL_MASK, %eax 34129a2e2836ff9ea65a603c89df217f4198973a74fDmitry Adamushko#endif 34278be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $USER_RPL, %eax 34378be3706b21a232310590fe00258b224177ac05fRusty Russell jb resume_kernel # not returning to v8086 or userspace 344f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_userspace) 346c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 347139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 350e32e58a96de4ac35a03349db2ab69f263ded958fPeter Zijlstra TRACE_IRQS_OFF 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done on 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # int/exception return? 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_pending 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp restore_all 35647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_exception) 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_kernel) 360139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsneed_resched: 362c2daa3bed53a81171cf8c1a36db798e82b91afe8Peter Zijlstra cmpl $0,PER_CPU_VAR(__preempt_count) 363c2daa3bed53a81171cf8c1a36db798e82b91afe8Peter Zijlstra jnz restore_all 364ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call preempt_schedule_irq 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp need_resched 36847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(resume_kernel) 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 370fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* SYSENTER_RETURN points to after the "sysenter" instruction in 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # sysenter call handler stub 3760aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENTRY(ia32_sysenter_target) 377fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC simple 378adf1423698f00d00b267f7dca8231340ce7d65efJan Beulich CFI_SIGNAL_FRAME 379fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_DEF_CFA esp, 0 380fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REGISTER esp, ebp 381faca62273b602ab482fb7d3d940dbf41ef08b00eH. Peter Anvin movl TSS_sysenter_sp0(%esp),%esp 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssysenter_past_esp: 38355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar /* 384d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * Interrupts are disabled here, but we can't trace it until 385d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * enough kernel state to call TRACE_IRQS_OFF can be called - but 386d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * we immediately enable interrupts at that point anyway. 38755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 3883234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_DS 389fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET ss, 0*/ 390df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 391fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET esp, 0 392df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 393d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge orl $X86_EFLAGS_IF, (%esp) 3943234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_CS 395fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET cs, 0*/ 396e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar /* 397e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * Push current_thread_info()->sysenter_return to the stack. 398e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * A tiny bit of offset fixup is necessary - 4*4 means the 4 words 399e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * pushed above; +8 corresponds to copy_thread's esp0 setting. 400e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar */ 4017bf04be8f48ceeeffa5b5a79734d6d6e0d59e5f8Stratos Psomadakis pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) 402fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET eip, 0 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 404df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 405d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge SAVE_ALL 406d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge ENABLE_INTERRUPTS(CLBR_NONE) 407d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Load the potential sixth argument from user stack. 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Careful about security. 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $__PAGE_OFFSET-3,%ebp 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_fault 414e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_STAC 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds1: movl (%ebp),%ebp 416e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 417d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge movl %ebp,PT_EBP(%esp) 4186837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,syscall_fault) 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 42288200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 423af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz sysenter_audit 424af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_do_call: 425303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 426554086d85e71f30abe46fc014fea31929a7c6a8aAndy Lutomirski jae sysenter_badsys 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 428554086d85e71f30abe46fc014fea31929a7c6a8aAndy Lutomirskisysenter_after_call: 4298142b215501f8b291a108a202b3a053a265b03ddSven Wegener movl %eax,PT_EAX(%esp) 430c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 43142c24fa22e86365055fc931d833f26165e687c19Jeremy Fitzhardinge DISABLE_INTERRUPTS(CLBR_ANY) 43255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 43488200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx 435af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne sysexit_audit 436af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_exit: 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* if something modifies registers it must also disable sysexit */ 438eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EIP(%esp), %edx 439eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_OLDESP(%esp), %ecx 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %ebp,%ebp 44155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 442464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge1: mov PT_FS(%esp), %fs 443ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS 444d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge ENABLE_INTERRUPTS_SYSEXIT 445af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 446af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifdef CONFIG_AUDITSYSCALL 447af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_audit: 44888200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) 449af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz syscall_trace_entry 45026c2d2b39128adba276d140eefa2745591b88536Eric Paris /* movl PT_EAX(%esp), %eax already set, syscall number: 1st arg to audit */ 45126c2d2b39128adba276d140eefa2745591b88536Eric Paris movl PT_EBX(%esp), %edx /* ebx/a0: 2nd arg to audit */ 45226c2d2b39128adba276d140eefa2745591b88536Eric Paris /* movl PT_ECX(%esp), %ecx already set, a1: 3nd arg to audit */ 45326c2d2b39128adba276d140eefa2745591b88536Eric Paris pushl_cfi PT_ESI(%esp) /* a3: 5th arg */ 45426c2d2b39128adba276d140eefa2745591b88536Eric Paris pushl_cfi PT_EDX+4(%esp) /* a2: 4th arg */ 455b05d8447e7821695bc2fa3359431f7a664232743Eric Paris call __audit_syscall_entry 45626c2d2b39128adba276d140eefa2745591b88536Eric Paris popl_cfi %ecx /* get that remapped edx off the stack */ 45726c2d2b39128adba276d140eefa2745591b88536Eric Paris popl_cfi %ecx /* get that remapped esi off the stack */ 458af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall number */ 459af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_do_call 460af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 461af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysexit_audit: 46288200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 463af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 464af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_ON 465af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath ENABLE_INTERRUPTS(CLBR_ANY) 466af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* second arg, syscall return value */ 467d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris cmpl $-MAX_ERRNO,%eax /* is it an error ? */ 468d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris setbe %al /* 1 if so, 0 if not */ 469af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movzbl %al,%eax /* zero-extend that */ 470d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris call __audit_syscall_exit 471af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath DISABLE_INTERRUPTS(CLBR_ANY) 472af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_OFF 473af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl TI_flags(%ebp), %ecx 47488200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 475af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 476af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall return value */ 477af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_exit 478af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 479af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 480fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 481f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.pushsection .fixup,"ax" 482464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge2: movl $0,PT_FS(%esp) 483f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge jmp 1b 484f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 4856837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,2b) 486ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS_EX 4870aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENDPROC(ia32_sysenter_target) 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # system call handler stub 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(system_call) 491fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 492e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 493df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax # save orig_eax 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 496ed75e8d58010fdc06e2c3a81bfbebae92314c7e3Laurent Vivier # system call tracing in operation / emulation 49788200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz syscall_trace_entry 499303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_call: 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 5038142b215501f8b291a108a202b3a053a265b03ddSven Wegenersyscall_after_call: 504eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) # store the return value 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit: 506c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 507139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 51055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 51288200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx # current->work 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne syscall_exit_work 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_all: 5162e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum TRACE_IRQS_IRET 5172e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelumrestore_all_notrace: 51834273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 519eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS 520eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge # Warning: PT_OLDSS(%esp) contains the wrong/random values if we 5215df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # are returning to the kernel. 5225df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # See comments in process.c:copy_thread() for details. 523eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_OLDSS(%esp), %ah 524eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 525ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax 52678be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax 527fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REMEMBER_STATE 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds je ldt_ss # returning to user-space with LDT SS 52934273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_nocheck: 531ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo RESTORE_REGS 4 # skip orig_eax/error_code 532f7f3d791e61d7baf8b0aee0384fdd469c0d2ac9bAdrian Bunkirq_return: 5333701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar INTERRUPT_RETURN 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section .fixup,"ax" 53590e9f53662826db3cdd6d99bd394d727b05160c1Jeremy FitzhardingeENTRY(iret_exc) 536a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $0 # no error code 537a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $do_iret_error 538a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds jmp error_code 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5406837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(irq_return,iret_exc) 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 54234273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 543fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE_STATE 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsldt_ss: 545d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 546d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell /* 547d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * The kernel can't run on a non-flat stack if paravirt mode 548d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is active. Rather than try to fixup the high bits of 549d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * ESP, bypass this code entirely. This may break DOSemu 550d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * and/or Wine support in a paravirt VM, although the option 551d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is still available to implement the setting of the high 552d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * 16-bits in the INTERRUPT_RETURN paravirt-op. 553d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell */ 55493b1eab3d29e7ea32ee583de3362da84db06ded8Jeremy Fitzhardinge cmpl $0, pv_info+PARAVIRT_enabled 555d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell jne restore_nocheck 556d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 557d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 558dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 559dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Setup and switch to ESPFIX stack 560dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 561dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We're returning to userspace with a 16 bit stack. The CPU will not 562dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * restore the high word of ESP for us on executing iret... This is an 563dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * "official" bug of all the x86-compatible CPUs, which we can work 564dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * around to make dosemu and wine happy. We do this by preloading the 565dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * high word of ESP with the high word of the userspace ESP while 566dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * compensating for the offset by changing to the ESPFIX segment with 567dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * a base address that matches for the difference. 568dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 56972c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) 570dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %esp, %edx /* load kernel esp */ 571dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov PT_OLDESP(%esp), %eax /* load userspace esp */ 572dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %dx, %ax /* eax: new kernel esp */ 573dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum sub %eax, %edx /* offset (low word is 0) */ 574dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shr $16, %edx 57572c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ 57672c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ 577df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__ESPFIX_SS 578df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax /* new kernel esp */ 5792e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum /* Disable interrupts, but do not irqtrace this section: we 5802e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * will soon execute iret and the tracer was already set to 5812e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * the irqstate after the iret */ 582139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_EAX) 583dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to espfix segment */ 584be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev CFI_ADJUST_CFA_OFFSET -8 585be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev jmp restore_nocheck 58634273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 587fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 58847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(system_call) 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform work that needs to be done immediately before resumption 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 592fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME # can't unwind into user space anyway 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_pending: 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_notifysig 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_resched: 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule 598c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 599139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 60255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done other 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # than syscall tracing? 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz work_resched 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig: # deal with pending signals and 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # notify-resume requests 61274b47a7844501445d41d704fe7c626f4b1819508Joe Korty#ifdef CONFIG_VM86 613ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_notifysig_v86 # returning to kernel-space or 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # vm86-space 617969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro1: 618969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro#else 619969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro movl %esp, %eax 620969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro#endif 6213596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju TRACE_IRQS_ON 6223596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju ENABLE_INTERRUPTS(CLBR_NONE) 62344fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro movb PT_CS(%esp), %bl 62444fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro andb $SEGMENT_RPL_MASK, %bl 62544fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro cmpb $USER_RPL, %bl 62644fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jb resume_kernel 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 62944fbbb3dc687c9709a6f2236197316e5c79ab1ebAl Viro jmp resume_userspace 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 631969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro#ifdef CONFIG_VM86 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig_v86: 634df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx # save ti_flags for do_notify_resume 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call save_v86_state # %eax contains pt_regs pointer 636df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %eax, %esp 638969ae0bfb079de892a95aa4ca1e8ac76c4beb57cAl Viro jmp 1b 63974b47a7844501445d41d704fe7c626f4b1819508Joe Korty#endif 64047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(work_pending) 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_trace_entry: 645eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 647d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_enter 648d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath /* What it returned is what we'll actually use. */ 649303395ac3bf3e2cb488435537d416bc840438fcbH. Peter Anvin cmpl $(NR_syscalls), %eax 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnae syscall_call 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 65247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_trace_entry) 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit_work: 65788200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_EXIT, %ecx 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_pending 65955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 660d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # schedule() instead 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 663d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_leave 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 66547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_exit_work) 666fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 6671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 668fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 6691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_fault: 670e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 672eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-EFAULT,PT_EAX(%esp) 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 67447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_fault) 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_badsys: 6778142b215501f8b291a108a202b3a053a265b03ddSven Wegener movl $-ENOSYS,%eax 6788142b215501f8b291a108a202b3a053a265b03ddSven Wegener jmp syscall_after_call 679554086d85e71f30abe46fc014fea31929a7c6a8aAndy LutomirskiEND(syscall_badsys) 680554086d85e71f30abe46fc014fea31929a7c6a8aAndy Lutomirski 681554086d85e71f30abe46fc014fea31929a7c6a8aAndy Lutomirskisysenter_badsys: 6828142b215501f8b291a108a202b3a053a265b03ddSven Wegener movl $-ENOSYS,%eax 683554086d85e71f30abe46fc014fea31929a7c6a8aAndy Lutomirski jmp sysenter_after_call 684fb21b84e7f809ef04b1e5aed5d463cf0d4866638Stefan BaderEND(sysenter_badsys) 685fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 687f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIXUP_ESPFIX_STACK 688dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 689dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Switch back for ESPFIX stack to the normal zerobased stack 690dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 691dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We can't call C functions using the ESPFIX stack. This code reads 692dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * the high word of the segment base from the GDT and swiches to the 693dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * normal stack and adjusts ESP with the matching offset. 694dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 69534273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 696dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum /* fixup the stack */ 69772c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ 69872c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ 699dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shl $16, %eax 700dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum addl %esp, %eax /* the adjusted stack pointer */ 701df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_DS 702df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 703dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to the normal stack segment */ 704f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_ADJUST_CFA_OFFSET -8 70534273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 706f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 707f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro UNWIND_ESPFIX_STACK 70834273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 709f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %ss, %eax 710f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* see if on espfix stack */ 711f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__ESPFIX_SS, %ax 712f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne 27f 713f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $__KERNEL_DS, %eax 714f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %ds 715f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %es 716f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* switch to normal stack */ 717f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIXUP_ESPFIX_STACK 718f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo27: 71934273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 720f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 7211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 723b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * Build the entry stubs and pointer table with some assembler magic. 724b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * We pack 7 stubs into a single 32-byte chunk, which will fit in a 725b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * single cache line on all modern x86 implementations. 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7274687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvin.section .init.rodata,"a" 7281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(interrupt) 729ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa.section .entry.text, "ax" 730b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align 5 731b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(irq_entries_start) 733fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 7344687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvinvector=FIRST_EXTERNAL_VECTOR 735b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin.rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 736b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .balign 32 737b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .rept 7 738b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .if vector < NR_VECTORS 7398665596ec05498525014436520b316ba174a068aH. Peter Anvin .if vector <> FIRST_EXTERNAL_VECTOR 740fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ADJUST_CFA_OFFSET -4 741b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 742df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ 7438665596ec05498525014436520b316ba174a068aH. Peter Anvin .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 744b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin jmp 2f 745b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 746b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .previous 7471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b 748ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 7491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvector=vector+1 750b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 751b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endr 752b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin2: jmp common_interrupt 7531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.endr 75447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(irq_entries_start) 75547a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich 75647a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 75747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(interrupt) 75847a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 76055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar/* 76155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * the CPU automatically disables interrupts when executing an IRQ vector, 76255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * so IRQ-flags tracing has to follow that: 76355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 764b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldscommon_interrupt: 766e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 767b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 76955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_IRQ 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp ret_from_intr 77347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(common_interrupt) 774fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 77602cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT3(name, nr, fn) \ 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(name) \ 778fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME; \ 779e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC; \ 780df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $~(nr); \ 781fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich SAVE_ALL; \ 78255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF \ 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax; \ 78402cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo call fn; \ 78555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jmp ret_from_intr; \ 78647a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich CFI_ENDPROC; \ 78747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(name) 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 789cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi 790cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#ifdef CONFIG_TRACING 791cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#define TRACE_BUILD_INTERRUPT(name, nr) \ 792cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi BUILD_INTERRUPT3(trace_##name, nr, smp_trace_##name) 793cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#else 794cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#define TRACE_BUILD_INTERRUPT(name, nr) 795cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#endif 796cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi 797cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi#define BUILD_INTERRUPT(name, nr) \ 798cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi BUILD_INTERRUPT3(name, nr, smp_##name); \ 799cf910e83ae23692fdeefc7e506e504c4c468d38aSeiji Aguchi TRACE_BUILD_INTERRUPT(name, nr) 80002cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* The include is where all of the SMP etc. interrupts come from */ 8021164dd0099c0d79146a55319670f57ab7ad1d352Ingo Molnar#include <asm/entry_arch.h> 8031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_error) 805fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 806e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 807df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 808df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_error 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 810fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 81147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_error) 8121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(simd_coprocessor_error) 814fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 815e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 816df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 81740d2e76315da38993129090dc5d56377e573c312Brian Gerst#ifdef CONFIG_X86_INVD_BUG 81840d2e76315da38993129090dc5d56377e573c312Brian Gerst /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ 819df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich661: pushl_cfi $do_general_protection 82040d2e76315da38993129090dc5d56377e573c312Brian Gerst662: 82140d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstructions,"a" 822b4ca46e4e82a0a5976fe5eab85be585d75f8202fAndy Lutomirski altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f 82340d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 82440d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstr_replacement,"ax" 82540d2e76315da38993129090dc5d56377e573c312Brian Gerst663: pushl $do_simd_coprocessor_error 82640d2e76315da38993129090dc5d56377e573c312Brian Gerst664: 82740d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 82840d2e76315da38993129090dc5d56377e573c312Brian Gerst#else 829df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_simd_coprocessor_error 83040d2e76315da38993129090dc5d56377e573c312Brian Gerst#endif 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 832fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 83347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(simd_coprocessor_error) 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(device_not_available) 836fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 837e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 838df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 839df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_device_not_available 8407643e9b936b4af31ba4851eb7d5b3a3bfad52502Alexander van Heukelum jmp error_code 841fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 84247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(device_not_available) 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 844d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 845d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty RussellENTRY(native_iret) 8463701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar iret 8476837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(native_iret, iret_exc) 84847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(native_iret) 849d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 850d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeENTRY(native_irq_enable_sysexit) 851d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sti 852d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sysexit 853d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeEND(native_irq_enable_sysexit) 854d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 855d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(overflow) 857fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 858e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 859df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 860df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_overflow 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 862fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 86347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(overflow) 8641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(bounds) 866fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 867e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 868df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 869df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_bounds 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 871fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 87247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(bounds) 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_op) 875fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 876e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 877df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 878df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_op 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 880fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 88147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_op) 8821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_segment_overrun) 884fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 885e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 886df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 887df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_segment_overrun 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 889fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_segment_overrun) 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_TSS) 893fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 894e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 895df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_TSS 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 897fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_TSS) 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(segment_not_present) 901fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 902e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 903df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_segment_not_present 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 905fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 90647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(segment_not_present) 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(stack_segment) 909fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 910e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 911df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_stack_segment 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 913fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 91447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(stack_segment) 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(alignment_check) 917fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 918e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 919df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_alignment_check 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 921fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(alignment_check) 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 924d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.PENTRY(divide_error) 925d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.P RING0_INT_FRAME 926e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 927df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 # no error code 928df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_divide_error 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 930fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 93147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(divide_error) 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_X86_MCE 9341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(machine_check) 935fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 936e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 937df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 938df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi machine_check_vector 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 940fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 94147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(machine_check) 9421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(spurious_interrupt_bug) 945fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 946e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 947df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 948df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_spurious_interrupt_bug 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 950fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(spurious_interrupt_bug) 9521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9535ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#ifdef CONFIG_XEN 954e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge/* Xen doesn't set %esp to be precisely what the normal sysenter 955e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge entrypoint expects, so fix it up before using the normal path. */ 956e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_sysenter_target) 957e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge RING0_INT_FRAME 958e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge addl $5*4, %esp /* remove xen-provided frame */ 9592ddf9b7b3e6660199269e34cfa27148440ddc3bfJan Beulich CFI_ADJUST_CFA_OFFSET -5*4 960e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge jmp sysenter_past_esp 961557d7d4e294ee6fb1db0cb6c1ec97a1c908b880dGlauber Costa CFI_ENDPROC 962e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 9635ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_hypervisor_callback) 9645ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 965a349e23d1cf746f8bdc603dcc61fae9ee4a695f6David Vrabel pushl_cfi $-1 /* orig_ax = -1 => not a system call */ 9665ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 9675ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge TRACE_IRQS_OFF 9689ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 9699ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge /* Check to see if we got the event in the critical 9709ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge region in xen_iret_direct, after we've reenabled 9719ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge events and checked for pending events. This simulates 9729ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge iret instruction's behaviour where it delivers a 9739ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge pending interrupt when enabling interrupts. */ 9749ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge movl PT_EIP(%esp),%eax 9759ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_start_crit,%eax 9769ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jb 1f 9779ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_end_crit,%eax 9789ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jae 1f 9799ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 9800f2c87695219b1129ccf93e0f58acdcdd49724b9Jeremy Fitzhardinge jmp xen_iret_crit_fixup 981e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 982e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_do_upcall) 983b77797fb2bf31bf076e6b69736119bc6a077525bJeremy Fitzhardinge1: mov %esp, %eax 9845ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge call xen_evtchn_do_upcall 9855ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_intr 9865ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 9875ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_hypervisor_callback) 9885ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 9895ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Hypervisor uses this for application faults while it executes. 9905ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We get here for two reasons: 9915ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 1. Fault while reloading DS, ES, FS or GS 9925ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 2. Fault while executing IRET 9935ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 1 we fix up by reattempting the load, and zeroing the segment 9945ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# register if the load fails. 9955ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 2 we fix up by jumping to do_iret_error. We cannot use the 9965ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# normal Linux return path in this case because if we use the IRET hypercall 9975ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# to pop the stack frame we end up in an infinite loop of failsafe callbacks. 9985ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We distinguish between categories by maintaining a status value in EAX. 9995ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_failsafe_callback) 10005ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1001df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 10025ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl $1,%eax 10035ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge1: mov 4(%esp),%ds 10045ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge2: mov 8(%esp),%es 10055ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge3: mov 12(%esp),%fs 10065ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge4: mov 16(%esp),%gs 1007a349e23d1cf746f8bdc603dcc61fae9ee4a695f6David Vrabel /* EAX == 0 => Category 1 (Bad segment) 1008a349e23d1cf746f8bdc603dcc61fae9ee4a695f6David Vrabel EAX != 0 => Category 2 (Bad IRET) */ 10095ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge testl %eax,%eax 1010df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 10115ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge lea 16(%esp),%esp 10125ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ADJUST_CFA_OFFSET -16 10135ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jz 5f 1014a349e23d1cf746f8bdc603dcc61fae9ee4a695f6David Vrabel jmp iret_exc 1015a349e23d1cf746f8bdc603dcc61fae9ee4a695f6David Vrabel5: pushl_cfi $-1 /* orig_ax = -1 => not a system call */ 10165ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10175ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_exception 10185ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10195ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10205ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section .fixup,"ax" 10215ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge6: xorl %eax,%eax 10225ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,4(%esp) 10235ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 1b 10245ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge7: xorl %eax,%eax 10255ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,8(%esp) 10265ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 2b 10275ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge8: xorl %eax,%eax 10285ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,12(%esp) 10295ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 3b 10305ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge9: xorl %eax,%eax 10315ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,16(%esp) 10325ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 4b 10335ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 10346837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(1b,6b) 10356837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(2b,7b) 10366837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(3b,8b) 10376837a54dd6127f055dcb26d00fee0df05c07a674H. Peter Anvin _ASM_EXTABLE(4b,9b) 10385ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_failsafe_callback) 10395ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 1040bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. SrinivasanBUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR, 104138e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang xen_evtchn_do_upcall) 104238e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang 10435ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#endif /* CONFIG_XEN */ 1044bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan 1045bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan#if IS_ENABLED(CONFIG_HYPERV) 1046bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan 1047bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. SrinivasanBUILD_INTERRUPT3(hyperv_callback_vector, HYPERVISOR_CALLBACK_VECTOR, 1048bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan hyperv_vector_handler) 1049bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan 1050bc2b0331e077f576369a2b6c75d15ed4de4ef91fK. Y. Srinivasan#endif /* CONFIG_HYPERV */ 10515ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 1052606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#ifdef CONFIG_FUNCTION_TRACER 1053d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#ifdef CONFIG_DYNAMIC_FTRACE 1054d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1055d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(mcount) 1056d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1057d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(mcount) 1058d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1059d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(ftrace_caller) 1060d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %eax 1061d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %ecx 1062d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %edx 106308f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt pushl $0 /* Pass NULL as regs pointer */ 106408f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt movl 4*4(%esp), %eax 1065d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0x4(%ebp), %edx 10661739f09e33d8f66bf48ddbc3eca615574da6c4f6Steven Rostedt movl function_trace_op, %ecx 1067395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 1068d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1069d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_call 1070d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_call: 1071d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call ftrace_stub 1072d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 107308f6fba503111e0336f2b4d6915a4a18f9b60e51Steven Rostedt addl $4,%esp /* skip NULL pointer */ 1074d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %edx 1075d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %ecx 1076d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %eax 10774de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedtftrace_ret: 10785a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#ifdef CONFIG_FUNCTION_GRAPH_TRACER 10795a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt.globl ftrace_graph_call 10805a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedtftrace_graph_call: 10815a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt jmp ftrace_stub 10825a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#endif 1083d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1084d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_stub 1085d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_stub: 1086d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1087d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(ftrace_caller) 1088d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 10894de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven RostedtENTRY(ftrace_regs_caller) 10904de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushf /* push flags before compare (in cs location) */ 10914de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 10924de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt /* 10934de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * i386 does not save SS and ESP when coming from kernel. 10944de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * Instead, to get sp, ®s->sp is used (see ptrace.h). 10954de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * Unfortunately, that means eflags must be at the same location 10964de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * as the current return ip is. We move the return ip into the 10974de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt * ip location, and move flags into the return ip location. 10984de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt */ 10994de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl 4(%esp) /* save return ip into ip slot */ 11004de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11014de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl $0 /* Load 0 into orig_ax */ 11024de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %gs 11034de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %fs 11044de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %es 11054de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ds 11064de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %eax 11074de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ebp 11084de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %edi 11094de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %esi 11104de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %edx 11114de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ecx 11124de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt pushl %ebx 11134de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11144de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 13*4(%esp), %eax /* Get the saved flags */ 11154de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 14*4(%esp) /* Move saved flags into regs->flags location */ 11164de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt /* clobbering return ip */ 11174de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl $__KERNEL_CS,13*4(%esp) 11184de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11194de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 12*4(%esp), %eax /* Load ip (1st parameter) */ 1120a5e37863ab31d78faddff15675c89979792bc0bdMasami Hiramatsu subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */ 1121e4ea3f6b1bf3d489674a3660db652636e50186f9Uros Bizjak movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ 11221739f09e33d8f66bf48ddbc3eca615574da6c4f6Steven Rostedt movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ 1123e4ea3f6b1bf3d489674a3660db652636e50186f9Uros Bizjak pushl %esp /* Save pt_regs as 4th parameter */ 11244de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11254de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven RostedtGLOBAL(ftrace_regs_call) 11264de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt call ftrace_stub 11274de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11284de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt addl $4, %esp /* Skip pt_regs */ 11294de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 14*4(%esp), %eax /* Move flags back into cs */ 11304de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 13*4(%esp) /* Needed to keep addl from modifying flags */ 11314de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl 12*4(%esp), %eax /* Get return ip from regs->ip */ 11324de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt movl %eax, 14*4(%esp) /* Put return ip back for ret */ 11334de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11344de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ebx 11354de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ecx 11364de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %edx 11374de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %esi 11384de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %edi 11394de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ebp 11404de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %eax 11414de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %ds 11424de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %es 11434de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %fs 11444de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popl %gs 11454de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt addl $8, %esp /* Skip orig_ax and ip */ 11464de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popf /* Pop flags at end (no addl to corrupt flags) */ 11474de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt jmp ftrace_ret 11484de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt 11494de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt popf 11504de72395ff4cf48e23b61986dbc90b99a7c4ed97Steven Rostedt jmp ftrace_stub 1151d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#else /* ! CONFIG_DYNAMIC_FTRACE */ 1152d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 115316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloENTRY(mcount) 1154af058ab04d3d11383e5159132fc78a3700be3af5H. Peter Anvin cmpl $__PAGE_OFFSET, %esp 1155af058ab04d3d11383e5159132fc78a3700be3af5H. Peter Anvin jb ftrace_stub /* Paging not enabled yet? */ 1156af058ab04d3d11383e5159132fc78a3700be3af5H. Peter Anvin 115716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo cmpl $ftrace_stub, ftrace_trace_function 115816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jnz trace 1159fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1160c2324b694fa8ffee382a124198c68754088e483cIngo Molnar cmpl $ftrace_stub, ftrace_graph_return 1161fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker jnz ftrace_graph_caller 1162e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt 1163e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt cmpl $ftrace_graph_entry_stub, ftrace_graph_entry 1164e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt jnz ftrace_graph_caller 1165caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker#endif 116616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo.globl ftrace_stub 116716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Meloftrace_stub: 116816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo ret 116916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 117016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo /* taken from glibc */ 117116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melotrace: 117216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %eax 117316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %ecx 117416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %edx 117516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0xc(%esp), %eax 117616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0x4(%ebp), %edx 1177395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 117816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1179d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call *ftrace_trace_function 118016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 118116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %edx 118216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %ecx 118316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %eax 118416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jmp ftrace_stub 118516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloEND(mcount) 1186d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#endif /* CONFIG_DYNAMIC_FTRACE */ 1187606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 118816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1189fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1190fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerENTRY(ftrace_graph_caller) 1191caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1192caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %ecx 1193caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 11941dc1c6adf38bc5799d1594681645ced40ced4b6bFrederic Weisbecker movl 0xc(%esp), %edx 1195caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker lea 0x4(%ebp), %eax 119671e308a239c098673570d0b417d42262bb535909Steven Rostedt movl (%ebp), %ecx 1197bb4304c71c97bf727ec43cd2f195c2c237c27fd3Steven Rostedt subl $MCOUNT_INSN_SIZE, %edx 1198caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call prepare_ftrace_return 1199caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1200caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %ecx 1201caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1202e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker ret 1203fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerEND(ftrace_graph_caller) 1204caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker 1205caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker.globl return_to_handler 1206caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbeckerreturn_to_handler: 1207caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1208caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 120971e308a239c098673570d0b417d42262bb535909Steven Rostedt movl %ebp, %eax 1210caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call ftrace_return_to_handler 1211194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt movl %eax, %ecx 1212caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1213caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1214194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt jmp *%ecx 1215e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker#endif 121616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 121725c74b10bacead867478480170083f69cfc0db48Seiji Aguchi#ifdef CONFIG_TRACING 121825c74b10bacead867478480170083f69cfc0db48Seiji AguchiENTRY(trace_page_fault) 121925c74b10bacead867478480170083f69cfc0db48Seiji Aguchi RING0_EC_FRAME 122025c74b10bacead867478480170083f69cfc0db48Seiji Aguchi ASM_CLAC 122125c74b10bacead867478480170083f69cfc0db48Seiji Aguchi pushl_cfi $trace_do_page_fault 122225c74b10bacead867478480170083f69cfc0db48Seiji Aguchi jmp error_code 122325c74b10bacead867478480170083f69cfc0db48Seiji Aguchi CFI_ENDPROC 122425c74b10bacead867478480170083f69cfc0db48Seiji AguchiEND(trace_page_fault) 122525c74b10bacead867478480170083f69cfc0db48Seiji Aguchi#endif 122625c74b10bacead867478480170083f69cfc0db48Seiji Aguchi 1227d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(page_fault) 1228d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1229e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 1230df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_page_fault 1231d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ALIGN 1232d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumerror_code: 1233ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* the function address is in %gs's slot on the stack */ 1234df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 1235ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET fs, 0*/ 1236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 1237d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET es, 0*/ 1238df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 1239d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET ds, 0*/ 1240df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1241d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eax, 0 1242df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 1243d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebp, 0 1244df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 1245d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edi, 0 1246df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 1247d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET esi, 0 1248df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 1249d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edx, 0 1250df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 1251d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ecx, 0 1252df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 1253d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebx, 0 1254d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cld 1255d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__KERNEL_PERCPU), %ecx 1256d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %fs 1257d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum UNWIND_ESPFIX_STACK 1258ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo GS_TO_REG %ecx 1259ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl PT_GS(%esp), %edi # get the function address 1260d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl PT_ORIG_EAX(%esp), %edx # get the error code 1261d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart 1262ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo REG_TO_PTGS %ecx 1263ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %ecx 1264d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__USER_DS), %ecx 1265d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %ds 1266d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %es 1267d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1268d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1269d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call *%edi 1270d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1271d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1272d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(page_fault) 1273d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1274d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1275d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Debug traps and NMI can happen at the one SYSENTER instruction 1276d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * that sets up the real kernel stack. Check here, since we can't 1277d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * allow the wrong stack to be used. 1278d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1279d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have 1280d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * already pushed 3 words if it hits on the sysenter instruction: 1281d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * eflags, cs and eip. 1282d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1283d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * We just load the right stack, and push the three (known) values 1284d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * by hand onto the new stack - while updating the return eip past 1285d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * the instruction that would have done it for sysenter. 1286d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIX_STACK offset ok label 1288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__KERNEL_CS, 4(%esp) 1289f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne \ok 1290f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo\label: 1291f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl TSS_sysenter_sp0 + \offset(%esp), %esp 1292f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 0 1293f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_UNDEFINED eip 1294df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 1295df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_CS 1296df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $sysenter_past_esp 1297d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eip, 0 1298f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 1299d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1300d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(debug) 1301d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1302e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 1303d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1304d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne debug_stack_correct 1305f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn 1306d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumdebug_stack_correct: 1307df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1308d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1309d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1310d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # error code 0 1311d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1312d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_debug 1313d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1314d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1315d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(debug) 1316d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1317d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1318d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI is doubly nasty. It can happen _while_ we're handling 1319d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * a debug fault, and the debug fault hasn't yet been able to 1320d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * clear up the stack. So we first check whether we got an 1321d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI on the sysenter entry path, but after that we need to 1322d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * check whether we got an NMI on the debug path where the debug 1323d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * fault happened on the sysenter path. 1324d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1325d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(nmi) 1326d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1327e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 132834273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 1329df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1330d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ss, %eax 1331d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__ESPFIX_SS, %ax 1332df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1333d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_espfix_stack 133434273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 1335d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1336d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_stack_fixup 1337df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1338d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax 1339d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* Do not access memory above the end of our stack page, 1340d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * it might not exist. 1341d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1342d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum andl $(THREAD_SIZE-1),%eax 1343d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $(THREAD_SIZE-20),%eax 1344df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1345d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jae nmi_stack_correct 1346d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,12(%esp) 1347d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_debug_stack_check 1348d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_correct: 1349d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1350df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1351d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1352d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1353d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1354d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 13552e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jmp restore_all_notrace 1356d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1357d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1358d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_fixup: 1359d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1360f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, nmi_stack_correct, 1 1361d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1362d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1363d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_debug_stack_check: 1364d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1365d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__KERNEL_CS,16(%esp) 1366d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne nmi_stack_correct 1367d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug,(%esp) 1368d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jb nmi_stack_correct 1369d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug_esp_fix_insn,(%esp) 1370d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ja nmi_stack_correct 1371f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 24, nmi_stack_correct, 1 1372d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1373d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 137434273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#ifdef CONFIG_X86_ESPFIX32 1375d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_espfix_stack: 1376d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here. 1377d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1378d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * create the pointer to lss back 1379d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1380df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ss 1381df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esp 1382bda3a89745d7bb88d3e735046c0cdc3d0eb2ac24Stas Sergeev addl $4, (%esp) 1383d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* copy the iret frame of 12 bytes */ 1384d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .rept 3 1385df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi 16(%esp) 1386d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .endr 1387df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1388d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1389d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum FIXUP_ESPFIX_STACK # %eax == %esp 1390d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1391d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 1392d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RESTORE_REGS 1393d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum lss 12+4(%esp), %esp # back to espfix stack 1394d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ADJUST_CFA_OFFSET -24 1395d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp irq_return 139634273f41d57ee8d854dcd2a1d754cbb546cb548fH. Peter Anvin#endif 1397d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1398d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(nmi) 1399d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1400d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(int3) 1401d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1402e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 1403df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1404d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1405d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1406d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1407d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1408d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_int3 1409d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1410d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1411d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(int3) 1412d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1413d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(general_protection) 1414d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1415df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_general_protection 1416d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp error_code 1417d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1418d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(general_protection) 1419d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1420631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#ifdef CONFIG_KVM_GUEST 1421631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb NatapovENTRY(async_page_fault) 1422631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov RING0_EC_FRAME 1423e59d1b0a24199db01978e6c1e89859eda93ce683H. Peter Anvin ASM_CLAC 142460cf637a13932a4750da6746efd0199e8a4c341bJan Beulich pushl_cfi $do_async_page_fault 1425631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov jmp error_code 1426631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov CFI_ENDPROC 14272ae9d293b14d17f35eff624272cfecac7979a2eeSedat DilekEND(async_page_fault) 1428631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#endif 1429631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov 1430