entry_32.S revision d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4
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> 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 60af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ 61af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#include <linux/elf-em.h> 62af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 63af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define __AUDIT_ARCH_LE 0x40000000 64af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 65af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifndef CONFIG_AUDITSYSCALL 66af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysenter_audit syscall_trace_entry 67af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysexit_audit syscall_exit_work 68af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 69af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 70ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 71ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa 72139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell/* 73139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * We use macros for low-level operations which need to be overridden 74139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * for paravirtualization. The following will never clobber any registers: 75139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * INTERRUPT_RETURN (aka. "iret") 76139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") 77d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). 78139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * 79139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must 80139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). 81139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * Allowing a register to be clobbered can shrink the paravirt replacement 82139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * enough to patch inline, increasing performance. 83139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell */ 84139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define nr_syscalls ((syscall_table_size)/4) 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 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 1034031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#ifdef CONFIG_VM86 1044031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#define resume_userspace_sig check_userspace 1054031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#else 1064031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#define resume_userspace_sig resume_userspace 1074031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#endif 1084031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov 109ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo/* 110ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * User gs save/restore 111ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 112ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * %gs is used for userland TLS and kernel only uses it for stack 113ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * canary which is required to be at %gs:20 by gcc. Read the comment 114ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * at the top of stackprotector.h for more info. 115ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 116ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * Local labels 98 and 99 are used. 117ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo */ 118ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#ifdef CONFIG_X86_32_LAZY_GS 119ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 120ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* unfortunately push/pop can't be no-op */ 121ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 122df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 123ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 124ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 125ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo addl $(4 + \pop), %esp 126ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -(4 + \pop) 127ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 128ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 129ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 130ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 131ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* all the rest are no-op */ 132ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 133ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 134ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 135ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 136ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 137ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 138ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 139ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 140ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 141ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 142ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 143ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#else /* CONFIG_X86_32_LAZY_GS */ 144ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 145ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 146df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %gs 147ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, 0*/ 148ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 149ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 150ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 151df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich98: popl_cfi %gs 152ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_RESTORE gs*/ 153ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .if \pop <> 0 154ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo add $\pop, %esp 155ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -\pop 156ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .endif 157ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 158ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 159ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 160ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, (%esp) 161ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 162ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.section __ex_table, "a" 163ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .align 4 164ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .long 98b, 99b 165ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 166ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 167ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 168ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 169ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo98: mov PT_GS(%esp), %gs 170ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 171ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 172ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 173ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, PT_GS(%esp) 174ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 175ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.section __ex_table, "a" 176ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .align 4 177ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .long 98b, 99b 178ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 179ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 180ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 181ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 182ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl %gs, \reg 183ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REGISTER gs, \reg*/ 184ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 185ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 186ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, PT_GS(%esp) 187ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, PT_GS*/ 188ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 189ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 19060a5317ff0f42dd313094b88f809f63041568b08Tejun Heo movl $(__KERNEL_STACK_CANARY), \reg 191ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, %gs 192ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 193ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 194ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#endif /* CONFIG_X86_32_LAZY_GS */ 195ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 196f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro SAVE_ALL 197f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cld 198ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PUSH_GS 199df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 200f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET fs, 0;*/ 201df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 202f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET es, 0;*/ 203df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 204f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET ds, 0;*/ 205df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 206f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET eax, 0 207df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 208f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebp, 0 209df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 210f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edi, 0 211df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 212f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET esi, 0 213df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 214f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edx, 0 215df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 216f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ecx, 0 217df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 218f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebx, 0 219f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__USER_DS), %edx 220f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %ds 221f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %es 222f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__KERNEL_PERCPU), %edx 223464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge movl %edx, %fs 224ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %edx 225f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 227f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RESTORE_INT_REGS 228df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebx 229f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebx 230df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 231f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ecx 232df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edx 233f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edx 234df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %esi 235f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE esi 236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edi 237f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edi 238df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebp 239f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebp 240df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 241fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE eax 242f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 244ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro RESTORE_REGS pop=0 245f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo RESTORE_INT_REGS 246df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: popl_cfi %ds 247f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE ds;*/ 248df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich2: popl_cfi %es 249f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE es;*/ 250df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich3: popl_cfi %fs 251f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE fs;*/ 252ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS \pop 253f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.pushsection .fixup, "ax" 254f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo4: movl $0, (%esp) 255f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 1b 256f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo5: movl $0, (%esp) 257f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 2b 258f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo6: movl $0, (%esp) 259f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 3b 260f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.section __ex_table, "a" 261f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .align 4 262f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 1b, 4b 263f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 2b, 5b 264f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 3b, 6b 265f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 266ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS_EX 267f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 269f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_INT_FRAME 270f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 271f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 272f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 3*4 273f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 274fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 275f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 276fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 277f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_EC_FRAME 278f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 279f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 280f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 4*4 281f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 282fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 283f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 284fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_PTREGS_FRAME 286f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, PT_OLDESP-PT_EBX 289f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ 290f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eip, PT_EIP-PT_OLDESP 291f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ 292f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ 293f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eax, PT_EAX-PT_OLDESP 294f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ebp, PT_EBP-PT_OLDESP 295f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edi, PT_EDI-PT_OLDESP 296f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET esi, PT_ESI-PT_OLDESP 297f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edx, PT_EDX-PT_OLDESP 298f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ecx, PT_ECX-PT_OLDESP 299eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge CFI_OFFSET ebx, PT_EBX-PT_OLDESP 300f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(ret_from_fork) 303fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC 304df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule_tail 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 307df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 308df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0x0202 # Reset kernel eflags 309df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popfl_cfi 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 311fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 31247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_fork) 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 315a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Interrupt exit functions should be protected against kprobes 316a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 317a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 318a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return to user mode is not as complex as all this looks, 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but we want the default path for a system call return to 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * go as quickly as possible which is why some of this is 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * less clear than it otherwise should be. 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # userspace resumption stub bypassing syscall exit tracing 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 327fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_exception: 329139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell preempt_stop(CLBR_ANY) 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_intr: 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 3324031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelovcheck_userspace: 333eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS 334eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 335ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax 33678be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $USER_RPL, %eax 33778be3706b21a232310590fe00258b224177ac05fRusty Russell jb resume_kernel # not returning to v8086 or userspace 338f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_userspace) 340c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 341139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 344e32e58a96de4ac35a03349db2ab69f263ded958fPeter Zijlstra TRACE_IRQS_OFF 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done on 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # int/exception return? 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_pending 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp restore_all 35047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_exception) 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_kernel) 354139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? 3562e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jnz restore_all 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsneed_resched: 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx # need_resched set ? 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 361ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call preempt_schedule_irq 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp need_resched 36547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(resume_kernel) 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 367fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 368a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 369a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 370a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 371a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* SYSENTER_RETURN points to after the "sysenter" instruction in 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # sysenter call handler stub 3770aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENTRY(ia32_sysenter_target) 378fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC simple 379adf1423698f00d00b267f7dca8231340ce7d65efJan Beulich CFI_SIGNAL_FRAME 380fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_DEF_CFA esp, 0 381fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REGISTER esp, ebp 382faca62273b602ab482fb7d3d940dbf41ef08b00eH. Peter Anvin movl TSS_sysenter_sp0(%esp),%esp 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssysenter_past_esp: 38455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar /* 385d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * Interrupts are disabled here, but we can't trace it until 386d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * enough kernel state to call TRACE_IRQS_OFF can be called - but 387d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * we immediately enable interrupts at that point anyway. 38855f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 3893234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_DS 390fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET ss, 0*/ 391df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 392fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET esp, 0 393df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 394d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge orl $X86_EFLAGS_IF, (%esp) 3953234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_CS 396fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET cs, 0*/ 397e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar /* 398e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * Push current_thread_info()->sysenter_return to the stack. 399e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * A tiny bit of offset fixup is necessary - 4*4 means the 4 words 400e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * pushed above; +8 corresponds to copy_thread's esp0 setting. 401e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar */ 4027bf04be8f48ceeeffa5b5a79734d6d6e0d59e5f8Stratos Psomadakis pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) 403fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET eip, 0 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 405df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 406d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge SAVE_ALL 407d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge ENABLE_INTERRUPTS(CLBR_NONE) 408d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Load the potential sixth argument from user stack. 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Careful about security. 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $__PAGE_OFFSET-3,%ebp 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_fault 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds1: movl (%ebp),%ebp 416d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge movl %ebp,PT_EBP(%esp) 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section __ex_table,"a" 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .align 4 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b,syscall_fault 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 42488200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 425af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz sysenter_audit 426af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_do_call: 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 430eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) 431c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 43242c24fa22e86365055fc931d833f26165e687c19Jeremy Fitzhardinge DISABLE_INTERRUPTS(CLBR_ANY) 43355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 43588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx 436af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne sysexit_audit 437af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_exit: 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* if something modifies registers it must also disable sysexit */ 439eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EIP(%esp), %edx 440eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_OLDESP(%esp), %ecx 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %ebp,%ebp 44255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 443464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge1: mov PT_FS(%esp), %fs 444ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS 445d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge ENABLE_INTERRUPTS_SYSEXIT 446af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 447af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifdef CONFIG_AUDITSYSCALL 448af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_audit: 44988200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) 450af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz syscall_trace_entry 451af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath addl $4,%esp 452af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath CFI_ADJUST_CFA_OFFSET -4 453af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ 454af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ 455af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ 456af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ 457af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* 2nd arg: syscall number */ 458af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ 459af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath call audit_syscall_entry 460df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 461af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall number */ 462af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_do_call 463af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 464af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysexit_audit: 46588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 466af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 467af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_ON 468af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath ENABLE_INTERRUPTS(CLBR_ANY) 469af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* second arg, syscall return value */ 470d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris cmpl $-MAX_ERRNO,%eax /* is it an error ? */ 471d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris setbe %al /* 1 if so, 0 if not */ 472af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movzbl %al,%eax /* zero-extend that */ 473d7e7528bcd456f5c36ad4a202ccfb43c5aa98bc4Eric Paris call __audit_syscall_exit 474af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath DISABLE_INTERRUPTS(CLBR_ANY) 475af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_OFF 476af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl TI_flags(%ebp), %ecx 47788200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 478af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 479af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall return value */ 480af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_exit 481af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 482af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 483fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 484f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.pushsection .fixup,"ax" 485464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge2: movl $0,PT_FS(%esp) 486f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge jmp 1b 487f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.section __ex_table,"a" 488f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge .align 4 489f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge .long 1b,2b 490f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 491ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS_EX 4920aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENDPROC(ia32_sysenter_target) 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 494a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 495a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * syscall stub including irq exit should be protected against kprobes 496a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 497a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # system call handler stub 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(system_call) 500fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 501df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax # save orig_eax 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 504ed75e8d58010fdc06e2c3a81bfbebae92314c7e3Laurent Vivier # system call tracing in operation / emulation 50588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz syscall_trace_entry 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_call: 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 511eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) # store the return value 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit: 513c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 514139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 51755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 51988200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx # current->work 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne syscall_exit_work 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_all: 5232e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum TRACE_IRQS_IRET 5242e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelumrestore_all_notrace: 525eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS 526eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge # Warning: PT_OLDSS(%esp) contains the wrong/random values if we 5275df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # are returning to the kernel. 5285df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # See comments in process.c:copy_thread() for details. 529eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_OLDSS(%esp), %ah 530eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 531ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax 53278be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax 533fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REMEMBER_STATE 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds je ldt_ss # returning to user-space with LDT SS 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_nocheck: 536ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo RESTORE_REGS 4 # skip orig_eax/error_code 537f7f3d791e61d7baf8b0aee0384fdd469c0d2ac9bAdrian Bunkirq_return: 5383701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar INTERRUPT_RETURN 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section .fixup,"ax" 54090e9f53662826db3cdd6d99bd394d727b05160c1Jeremy FitzhardingeENTRY(iret_exc) 541a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $0 # no error code 542a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $do_iret_error 543a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds jmp error_code 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section __ex_table,"a" 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .align 4 5473701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar .long irq_return,iret_exc 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 550fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE_STATE 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsldt_ss: 552eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge larl PT_OLDSS(%esp), %eax 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testl $0x00400000, %eax # returning to 32bit stack? 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck # allright, normal return 556d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 557d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 558d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell /* 559d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * The kernel can't run on a non-flat stack if paravirt mode 560d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is active. Rather than try to fixup the high bits of 561d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * ESP, bypass this code entirely. This may break DOSemu 562d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * and/or Wine support in a paravirt VM, although the option 563d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is still available to implement the setting of the high 564d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * 16-bits in the INTERRUPT_RETURN paravirt-op. 565d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell */ 56693b1eab3d29e7ea32ee583de3362da84db06ded8Jeremy Fitzhardinge cmpl $0, pv_info+PARAVIRT_enabled 567d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell jne restore_nocheck 568d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 569d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 570dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 571dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Setup and switch to ESPFIX stack 572dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 573dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We're returning to userspace with a 16 bit stack. The CPU will not 574dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * restore the high word of ESP for us on executing iret... This is an 575dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * "official" bug of all the x86-compatible CPUs, which we can work 576dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * around to make dosemu and wine happy. We do this by preloading the 577dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * high word of ESP with the high word of the userspace ESP while 578dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * compensating for the offset by changing to the ESPFIX segment with 579dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * a base address that matches for the difference. 580dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 58172c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) 582dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %esp, %edx /* load kernel esp */ 583dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov PT_OLDESP(%esp), %eax /* load userspace esp */ 584dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %dx, %ax /* eax: new kernel esp */ 585dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum sub %eax, %edx /* offset (low word is 0) */ 586dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shr $16, %edx 58772c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ 58872c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ 589df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__ESPFIX_SS 590df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax /* new kernel esp */ 5912e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum /* Disable interrupts, but do not irqtrace this section: we 5922e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * will soon execute iret and the tracer was already set to 5932e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * the irqstate after the iret */ 594139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_EAX) 595dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to espfix segment */ 596be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev CFI_ADJUST_CFA_OFFSET -8 597be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev jmp restore_nocheck 598fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 59947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(system_call) 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform work that needs to be done immediately before resumption 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 603fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME # can't unwind into user space anyway 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_pending: 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_notifysig 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_resched: 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule 609c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 610139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 61355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done other 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # than syscall tracing? 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz work_resched 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig: # deal with pending signals and 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # notify-resume requests 62374b47a7844501445d41d704fe7c626f4b1819508Joe Korty#ifdef CONFIG_VM86 624ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_notifysig_v86 # returning to kernel-space or 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # vm86-space 6283596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju TRACE_IRQS_ON 6293596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju ENABLE_INTERRUPTS(CLBR_NONE) 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 6324031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov jmp resume_userspace_sig 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig_v86: 636df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx # save ti_flags for do_notify_resume 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call save_v86_state # %eax contains pt_regs pointer 638df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %eax, %esp 64074b47a7844501445d41d704fe7c626f4b1819508Joe Korty#else 64174b47a7844501445d41d704fe7c626f4b1819508Joe Korty movl %esp, %eax 64274b47a7844501445d41d704fe7c626f4b1819508Joe Korty#endif 6433596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju TRACE_IRQS_ON 6443596ff4e6b2aff8a28c69af389d5046090a53330Srikar Dronamraju ENABLE_INTERRUPTS(CLBR_NONE) 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 6474031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov jmp resume_userspace_sig 64847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(work_pending) 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_trace_entry: 653eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 655d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_enter 656d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath /* What it returned is what we'll actually use. */ 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnae syscall_call 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 66047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_trace_entry) 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit_work: 66588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_EXIT, %ecx 6661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_pending 66755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 668d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call 6691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # schedule() instead 6701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 671d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_leave 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 67347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_exit_work) 674fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 676fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_fault: 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 679eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-EFAULT,PT_EAX(%esp) 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 68147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_fault) 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_badsys: 684eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 68647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_badsys) 687fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 688a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 689a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 690a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 691a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 693253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst/* 694253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst * System calls that need a pt_regs pointer. 695253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst */ 696e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL0(name) \ 697253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst ALIGN; \ 698253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerstptregs_##name: \ 699253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst leal 4(%esp),%eax; \ 700253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst jmp sys_##name; 701253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 702e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL1(name) \ 703e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 704e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 705e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%edx; \ 706ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 707e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst jmp sys_##name; 708e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 709e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL2(name) \ 710e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 711e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 712e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%ecx; \ 713ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_ECX+4)(%esp),%edx; \ 714ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 715e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst jmp sys_##name; 716e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 717e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL3(name) \ 718e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 719e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 720a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC; \ 721e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%eax; \ 722a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax; \ 723e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EDX(%eax),%ecx; \ 724e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_ECX(%eax),%edx; \ 725e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EBX(%eax),%eax; \ 726e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst call sys_##name; \ 727e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst addl $4,%esp; \ 728a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -4; \ 729a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich ret; \ 730a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC; \ 731a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_##name) 732e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 73327f59559d63375a4d59e7c720a439d9f0b47edadBrian GerstPTREGSCALL1(iopl) 734e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(fork) 735e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(vfork) 73611cf88bd0b8165b65aaabaee0977e9a3ad474ab7Brian GerstPTREGSCALL3(execve) 737052acad48a566a6dbcccb95e5d22e5e1b7cac8ddBrian GerstPTREGSCALL2(sigaltstack) 738e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(sigreturn) 739e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(rt_sigreturn) 740f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL2(vm86) 741f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL1(vm86old) 742253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 743f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst/* Clone is an oddball. The 4th arg is in %edi */ 744f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst ALIGN; 745f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerstptregs_clone: 746a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC 747f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst leal 4(%esp),%eax 748a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax 749a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi PT_EDI(%eax) 750f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EDX(%eax),%ecx 751f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_ECX(%eax),%edx 752f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EBX(%eax),%eax 753f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst call sys_clone 754f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst addl $8,%esp 755a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -8 756f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst ret 757a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC 758a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_clone) 759f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst 760f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIXUP_ESPFIX_STACK 761dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 762dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Switch back for ESPFIX stack to the normal zerobased stack 763dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 764dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We can't call C functions using the ESPFIX stack. This code reads 765dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * the high word of the segment base from the GDT and swiches to the 766dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * normal stack and adjusts ESP with the matching offset. 767dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 768dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum /* fixup the stack */ 76972c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ 77072c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ 771dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shl $16, %eax 772dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum addl %esp, %eax /* the adjusted stack pointer */ 773df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_DS 774df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 775dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to the normal stack segment */ 776f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_ADJUST_CFA_OFFSET -8 777f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 778f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro UNWIND_ESPFIX_STACK 779f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %ss, %eax 780f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* see if on espfix stack */ 781f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__ESPFIX_SS, %ax 782f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne 27f 783f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $__KERNEL_DS, %eax 784f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %ds 785f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %es 786f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* switch to normal stack */ 787f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIXUP_ESPFIX_STACK 788f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo27: 789f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 792b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * Build the entry stubs and pointer table with some assembler magic. 793b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * We pack 7 stubs into a single 32-byte chunk, which will fit in a 794b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * single cache line on all modern x86 implementations. 7951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7964687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvin.section .init.rodata,"a" 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(interrupt) 798ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa.section .entry.text, "ax" 799b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align 5 800b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(irq_entries_start) 802fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 8034687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvinvector=FIRST_EXTERNAL_VECTOR 804b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin.rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 805b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .balign 32 806b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .rept 7 807b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .if vector < NR_VECTORS 8088665596ec05498525014436520b316ba174a068aH. Peter Anvin .if vector <> FIRST_EXTERNAL_VECTOR 809fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ADJUST_CFA_OFFSET -4 810b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 811df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ 8128665596ec05498525014436520b316ba174a068aH. Peter Anvin .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 813b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin jmp 2f 814b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 815b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .previous 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b 817ea7145477a461e09d8d194cac4b996dc4f449107Jiri Olsa .section .entry.text, "ax" 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvector=vector+1 819b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 820b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endr 821b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin2: jmp common_interrupt 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.endr 82347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(irq_entries_start) 82447a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich 82547a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 82647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(interrupt) 82747a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 82955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar/* 83055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * the CPU automatically disables interrupts when executing an IRQ vector, 83155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * so IRQ-flags tracing has to follow that: 83255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 833b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldscommon_interrupt: 835b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 83755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_IRQ 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp ret_from_intr 84147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(common_interrupt) 842fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 844a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 845a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Irq entries should be protected against kprobes 846a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 847a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 84802cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT3(name, nr, fn) \ 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(name) \ 850fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME; \ 851df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $~(nr); \ 852fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich SAVE_ALL; \ 85355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF \ 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax; \ 85502cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo call fn; \ 85655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jmp ret_from_intr; \ 85747a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich CFI_ENDPROC; \ 85847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(name) 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 86002cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) 86102cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* The include is where all of the SMP etc. interrupts come from */ 8631164dd0099c0d79146a55319670f57ab7ad1d352Ingo Molnar#include <asm/entry_arch.h> 8641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_error) 866fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 867df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 868df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_error 8691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 870fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 87147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_error) 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(simd_coprocessor_error) 874fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 875df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 87640d2e76315da38993129090dc5d56377e573c312Brian Gerst#ifdef CONFIG_X86_INVD_BUG 87740d2e76315da38993129090dc5d56377e573c312Brian Gerst /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ 878df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich661: pushl_cfi $do_general_protection 87940d2e76315da38993129090dc5d56377e573c312Brian Gerst662: 88040d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstructions,"a" 881b4ca46e4e82a0a5976fe5eab85be585d75f8202fAndy Lutomirski altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f 88240d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 88340d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstr_replacement,"ax" 88440d2e76315da38993129090dc5d56377e573c312Brian Gerst663: pushl $do_simd_coprocessor_error 88540d2e76315da38993129090dc5d56377e573c312Brian Gerst664: 88640d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 88740d2e76315da38993129090dc5d56377e573c312Brian Gerst#else 888df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_simd_coprocessor_error 88940d2e76315da38993129090dc5d56377e573c312Brian Gerst#endif 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 891fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(simd_coprocessor_error) 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(device_not_available) 895fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 896df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 897df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_device_not_available 8987643e9b936b4af31ba4851eb7d5b3a3bfad52502Alexander van Heukelum jmp error_code 899fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 90047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(device_not_available) 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 902d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 903d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty RussellENTRY(native_iret) 9043701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar iret 905d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell.section __ex_table,"a" 906d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell .align 4 9073701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar .long native_iret, iret_exc 908d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell.previous 90947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(native_iret) 910d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 911d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeENTRY(native_irq_enable_sysexit) 912d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sti 913d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sysexit 914d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeEND(native_irq_enable_sysexit) 915d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 916d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(overflow) 918fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 919df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 920df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_overflow 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 922fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(overflow) 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(bounds) 926fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 927df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 928df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_bounds 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 930fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 93147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(bounds) 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_op) 934fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 935df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 936df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_op 9371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 938fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 93947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_op) 9401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_segment_overrun) 942fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 943df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 944df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_segment_overrun 9451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 946fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 94747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_segment_overrun) 9481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_TSS) 950fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 951df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_TSS 9521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 953fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_TSS) 9551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(segment_not_present) 957fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 958df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_segment_not_present 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 960fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 96147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(segment_not_present) 9621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(stack_segment) 964fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 965df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_stack_segment 9661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 967fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 96847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(stack_segment) 9691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(alignment_check) 971fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 972df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_alignment_check 9731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 974fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 97547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(alignment_check) 9761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 977d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.PENTRY(divide_error) 978d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.P RING0_INT_FRAME 979df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 # no error code 980df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_divide_error 9811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 982fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 98347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(divide_error) 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_X86_MCE 9861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(machine_check) 987fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 988df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 989df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi machine_check_vector 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 991fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 99247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(machine_check) 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(spurious_interrupt_bug) 996fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 997df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 998df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_spurious_interrupt_bug 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 1000fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 100147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(spurious_interrupt_bug) 1002a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 1003a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 1004a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 1005a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 100702ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENTRY(kernel_thread_helper) 100802ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen pushl $0 # fake return address for unwinder 100902ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_STARTPROC 1010e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst movl %edi,%eax 1011e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst call *%esi 101202ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen call do_exit 10135f5db591326779a80cfe490c5d6b6ce9fac08b31jia zhang ud2 # padding for call trace 101402ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_ENDPROC 101502ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENDPROC(kernel_thread_helper) 101602ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen 10175ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#ifdef CONFIG_XEN 1018e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge/* Xen doesn't set %esp to be precisely what the normal sysenter 1019e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge entrypoint expects, so fix it up before using the normal path. */ 1020e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_sysenter_target) 1021e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge RING0_INT_FRAME 1022e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge addl $5*4, %esp /* remove xen-provided frame */ 10232ddf9b7b3e6660199269e34cfa27148440ddc3bfJan Beulich CFI_ADJUST_CFA_OFFSET -5*4 1024e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge jmp sysenter_past_esp 1025557d7d4e294ee6fb1db0cb6c1ec97a1c908b880dGlauber Costa CFI_ENDPROC 1026e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 10275ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_hypervisor_callback) 10285ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1029df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 10305ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10315ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge TRACE_IRQS_OFF 10329ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10339ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge /* Check to see if we got the event in the critical 10349ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge region in xen_iret_direct, after we've reenabled 10359ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge events and checked for pending events. This simulates 10369ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge iret instruction's behaviour where it delivers a 10379ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge pending interrupt when enabling interrupts. */ 10389ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge movl PT_EIP(%esp),%eax 10399ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_start_crit,%eax 10409ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jb 1f 10419ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_end_crit,%eax 10429ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jae 1f 10439ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10440f2c87695219b1129ccf93e0f58acdcdd49724b9Jeremy Fitzhardinge jmp xen_iret_crit_fixup 1045e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 1046e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_do_upcall) 1047b77797fb2bf31bf076e6b69736119bc6a077525bJeremy Fitzhardinge1: mov %esp, %eax 10485ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge call xen_evtchn_do_upcall 10495ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_intr 10505ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10515ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_hypervisor_callback) 10525ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10535ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Hypervisor uses this for application faults while it executes. 10545ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We get here for two reasons: 10555ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 1. Fault while reloading DS, ES, FS or GS 10565ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 2. Fault while executing IRET 10575ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 1 we fix up by reattempting the load, and zeroing the segment 10585ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# register if the load fails. 10595ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 2 we fix up by jumping to do_iret_error. We cannot use the 10605ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# normal Linux return path in this case because if we use the IRET hypercall 10615ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# to pop the stack frame we end up in an infinite loop of failsafe callbacks. 10625ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We distinguish between categories by maintaining a status value in EAX. 10635ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_failsafe_callback) 10645ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1065df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 10665ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl $1,%eax 10675ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge1: mov 4(%esp),%ds 10685ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge2: mov 8(%esp),%es 10695ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge3: mov 12(%esp),%fs 10705ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge4: mov 16(%esp),%gs 10715ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge testl %eax,%eax 1072df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 10735ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge lea 16(%esp),%esp 10745ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ADJUST_CFA_OFFSET -16 10755ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jz 5f 10765ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge addl $16,%esp 10775ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) 1078df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich5: pushl_cfi $0 # EAX == 0 => Category 1 (Bad segment) 10795ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10805ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_exception 10815ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10825ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10835ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section .fixup,"ax" 10845ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge6: xorl %eax,%eax 10855ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,4(%esp) 10865ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 1b 10875ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge7: xorl %eax,%eax 10885ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,8(%esp) 10895ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 2b 10905ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge8: xorl %eax,%eax 10915ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,12(%esp) 10925ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 3b 10935ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge9: xorl %eax,%eax 10945ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,16(%esp) 10955ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 4b 10965ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 10975ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section __ex_table,"a" 10985ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .align 4 10995ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 1b,6b 11005ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 2b,7b 11015ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 3b,8b 11025ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 4b,9b 11035ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 11045ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_failsafe_callback) 11055ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 110638e20b07efd541a959de367dc90a17f92ce2e8a6Sheng YangBUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, 110738e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang xen_evtchn_do_upcall) 110838e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang 11095ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#endif /* CONFIG_XEN */ 11105ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 1111606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#ifdef CONFIG_FUNCTION_TRACER 1112d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#ifdef CONFIG_DYNAMIC_FTRACE 1113d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1114d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(mcount) 1115d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1116d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(mcount) 1117d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1118d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(ftrace_caller) 111960a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 112060a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 112160a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 1122d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %eax 1123d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %ecx 1124d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %edx 1125d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0xc(%esp), %eax 1126d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0x4(%ebp), %edx 1127395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 1128d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1129d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_call 1130d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_call: 1131d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call ftrace_stub 1132d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1133d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %edx 1134d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %ecx 1135d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %eax 11365a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#ifdef CONFIG_FUNCTION_GRAPH_TRACER 11375a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt.globl ftrace_graph_call 11385a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedtftrace_graph_call: 11395a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt jmp ftrace_stub 11405a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#endif 1141d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1142d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_stub 1143d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_stub: 1144d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1145d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(ftrace_caller) 1146d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1147d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#else /* ! CONFIG_DYNAMIC_FTRACE */ 1148d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 114916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloENTRY(mcount) 115060a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 115160a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 115260a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 115316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo cmpl $ftrace_stub, ftrace_trace_function 115416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jnz trace 1155fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1156c2324b694fa8ffee382a124198c68754088e483cIngo Molnar cmpl $ftrace_stub, ftrace_graph_return 1157fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker jnz ftrace_graph_caller 1158e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt 1159e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt cmpl $ftrace_graph_entry_stub, ftrace_graph_entry 1160e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt jnz ftrace_graph_caller 1161caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker#endif 116216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo.globl ftrace_stub 116316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Meloftrace_stub: 116416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo ret 116516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 116616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo /* taken from glibc */ 116716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melotrace: 116816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %eax 116916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %ecx 117016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %edx 117116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0xc(%esp), %eax 117216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0x4(%ebp), %edx 1173395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 117416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1175d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call *ftrace_trace_function 117616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 117716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %edx 117816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %ecx 117916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %eax 118016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jmp ftrace_stub 118116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloEND(mcount) 1182d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#endif /* CONFIG_DYNAMIC_FTRACE */ 1183606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 118416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1185fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1186fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerENTRY(ftrace_graph_caller) 1187e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker cmpl $0, function_trace_stop 1188e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker jne ftrace_stub 1189e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker 1190caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1191caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %ecx 1192caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 11931dc1c6adf38bc5799d1594681645ced40ced4b6bFrederic Weisbecker movl 0xc(%esp), %edx 1194caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker lea 0x4(%ebp), %eax 119571e308a239c098673570d0b417d42262bb535909Steven Rostedt movl (%ebp), %ecx 1196bb4304c71c97bf727ec43cd2f195c2c237c27fd3Steven Rostedt subl $MCOUNT_INSN_SIZE, %edx 1197caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call prepare_ftrace_return 1198caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1199caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %ecx 1200caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1201e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker ret 1202fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerEND(ftrace_graph_caller) 1203caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker 1204caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker.globl return_to_handler 1205caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbeckerreturn_to_handler: 1206caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1207caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 120871e308a239c098673570d0b417d42262bb535909Steven Rostedt movl %ebp, %eax 1209caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call ftrace_return_to_handler 1210194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt movl %eax, %ecx 1211caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1212caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1213194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt jmp *%ecx 1214e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker#endif 121516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1216bb152f53120d66c98c1f16518407df6a84f23714Arjan van de Ven.section .rodata,"a" 1217541054d935a1ec89916977cbf0d16ddb71b3ff5cThomas Gleixner#include "syscall_table_32.S" 12181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_table_size=(.-sys_call_table) 1220d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1221d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1222d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Some functions should be protected against kprobes 1223d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1224d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .pushsection .kprobes.text, "ax" 1225d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1226d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(page_fault) 1227d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1228df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_page_fault 1229d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ALIGN 1230d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumerror_code: 1231ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* the function address is in %gs's slot on the stack */ 1232df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 1233ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET fs, 0*/ 1234df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 1235d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET es, 0*/ 1236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 1237d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET ds, 0*/ 1238df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1239d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eax, 0 1240df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 1241d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebp, 0 1242df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 1243d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edi, 0 1244df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 1245d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET esi, 0 1246df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 1247d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edx, 0 1248df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 1249d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ecx, 0 1250df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 1251d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebx, 0 1252d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cld 1253d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__KERNEL_PERCPU), %ecx 1254d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %fs 1255d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum UNWIND_ESPFIX_STACK 1256ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo GS_TO_REG %ecx 1257ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl PT_GS(%esp), %edi # get the function address 1258d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl PT_ORIG_EAX(%esp), %edx # get the error code 1259d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart 1260ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo REG_TO_PTGS %ecx 1261ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %ecx 1262d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__USER_DS), %ecx 1263d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %ds 1264d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %es 1265d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1266d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1267d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call *%edi 1268d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1269d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1270d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(page_fault) 1271d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1272d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1273d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Debug traps and NMI can happen at the one SYSENTER instruction 1274d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * that sets up the real kernel stack. Check here, since we can't 1275d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * allow the wrong stack to be used. 1276d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1277d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have 1278d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * already pushed 3 words if it hits on the sysenter instruction: 1279d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * eflags, cs and eip. 1280d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1281d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * We just load the right stack, and push the three (known) values 1282d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * by hand onto the new stack - while updating the return eip past 1283d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * the instruction that would have done it for sysenter. 1284d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIX_STACK offset ok label 1286f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__KERNEL_CS, 4(%esp) 1287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne \ok 1288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo\label: 1289f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl TSS_sysenter_sp0 + \offset(%esp), %esp 1290f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 0 1291f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_UNDEFINED eip 1292df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 1293df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_CS 1294df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $sysenter_past_esp 1295d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eip, 0 1296f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 1297d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1298d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(debug) 1299d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1300d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1301d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne debug_stack_correct 1302f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn 1303d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumdebug_stack_correct: 1304df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1305d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1306d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1307d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # error code 0 1308d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1309d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_debug 1310d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1311d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1312d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(debug) 1313d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1314d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1315d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI is doubly nasty. It can happen _while_ we're handling 1316d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * a debug fault, and the debug fault hasn't yet been able to 1317d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * clear up the stack. So we first check whether we got an 1318d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI on the sysenter entry path, but after that we need to 1319d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * check whether we got an NMI on the debug path where the debug 1320d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * fault happened on the sysenter path. 1321d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1322d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(nmi) 1323d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1324df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1325d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ss, %eax 1326d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__ESPFIX_SS, %ax 1327df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1328d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_espfix_stack 1329d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1330d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_stack_fixup 1331df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1332d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax 1333d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* Do not access memory above the end of our stack page, 1334d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * it might not exist. 1335d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1336d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum andl $(THREAD_SIZE-1),%eax 1337d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $(THREAD_SIZE-20),%eax 1338df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1339d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jae nmi_stack_correct 1340d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,12(%esp) 1341d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_debug_stack_check 1342d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_correct: 1343d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1344df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1345d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1346d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1347d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1348d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 13492e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jmp restore_all_notrace 1350d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1351d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1352d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_fixup: 1353d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1354f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, nmi_stack_correct, 1 1355d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1356d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1357d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_debug_stack_check: 1358d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1359d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__KERNEL_CS,16(%esp) 1360d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne nmi_stack_correct 1361d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug,(%esp) 1362d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jb nmi_stack_correct 1363d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug_esp_fix_insn,(%esp) 1364d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ja nmi_stack_correct 1365f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 24, nmi_stack_correct, 1 1366d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1367d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1368d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_espfix_stack: 1369d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here. 1370d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1371d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * create the pointer to lss back 1372d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1373df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ss 1374df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esp 1375bda3a89745d7bb88d3e735046c0cdc3d0eb2ac24Stas Sergeev addl $4, (%esp) 1376d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* copy the iret frame of 12 bytes */ 1377d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .rept 3 1378df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi 16(%esp) 1379d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .endr 1380df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1381d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1382d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum FIXUP_ESPFIX_STACK # %eax == %esp 1383d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1384d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 1385d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RESTORE_REGS 1386d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum lss 12+4(%esp), %esp # back to espfix stack 1387d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ADJUST_CFA_OFFSET -24 1388d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp irq_return 1389d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1390d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(nmi) 1391d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1392d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(int3) 1393d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1394df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1395d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1396d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1397d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1398d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1399d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_int3 1400d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1401d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1402d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(int3) 1403d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1404d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(general_protection) 1405d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1406df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_general_protection 1407d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp error_code 1408d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1409d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(general_protection) 1410d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1411631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#ifdef CONFIG_KVM_GUEST 1412631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb NatapovENTRY(async_page_fault) 1413631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov RING0_EC_FRAME 141460cf637a13932a4750da6746efd0199e8a4c341bJan Beulich pushl_cfi $do_async_page_fault 1415631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov jmp error_code 1416631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov CFI_ENDPROC 14172ae9d293b14d17f35eff624272cfecac7979a2eeSedat DilekEND(async_page_fault) 1418631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#endif 1419631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov 1420d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1421d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * End of kprobes section 1422d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1423d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .popsection 1424