entry_32.S revision 631bc4878220932fe67fc46fc7cf7cccdb1ec597
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> 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/thread_info.h> 4655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#include <asm/irqflags.h> 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/errno.h> 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/segment.h> 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/smp.h> 500341c14da49e7b93d2998926f6ac89a3129e3fa1Jeremy Fitzhardinge#include <asm/page_types.h> 51be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev#include <asm/percpu.h> 52fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich#include <asm/dwarf2.h> 53ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov#include <asm/processor-flags.h> 54395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar#include <asm/ftrace.h> 559b7dc567d03d74a1fbae84e88949b6a60d922d82Thomas Gleixner#include <asm/irq_vectors.h> 5640d2e76315da38993129090dc5d56377e573c312Brian Gerst#include <asm/cpufeature.h> 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 58af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ 59af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#include <linux/elf-em.h> 60af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 61af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define __AUDIT_ARCH_LE 0x40000000 62af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 63af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifndef CONFIG_AUDITSYSCALL 64af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysenter_audit syscall_trace_entry 65af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#define sysexit_audit syscall_exit_work 66af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 67af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 68139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell/* 69139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * We use macros for low-level operations which need to be overridden 70139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * for paravirtualization. The following will never clobber any registers: 71139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * INTERRUPT_RETURN (aka. "iret") 72139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") 73d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). 74139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * 75139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must 76139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). 77139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * Allowing a register to be clobbered can shrink the paravirt replacement 78139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell * enough to patch inline, increasing performance. 79139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell */ 80139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define nr_syscalls ((syscall_table_size)/4) 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 84139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 86139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell#define preempt_stop(clobbers) 872e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum#define resume_kernel restore_all 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.macro TRACE_IRQS_IRET 9155f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#ifdef CONFIG_TRACE_IRQFLAGS 92ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? 9355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jz 1f 9455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 9555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar1: 9655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar#endif 9755f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar.endm 9855f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar 994031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#ifdef CONFIG_VM86 1004031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#define resume_userspace_sig check_userspace 1014031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#else 1024031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#define resume_userspace_sig resume_userspace 1034031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov#endif 1044031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov 105ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo/* 106ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * User gs save/restore 107ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 108ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * %gs is used for userland TLS and kernel only uses it for stack 109ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * canary which is required to be at %gs:20 by gcc. Read the comment 110ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * at the top of stackprotector.h for more info. 111ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * 112ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo * Local labels 98 and 99 are used. 113ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo */ 114ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#ifdef CONFIG_X86_32_LAZY_GS 115ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 116ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* unfortunately push/pop can't be no-op */ 117ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 118df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 119ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 120ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 121ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo addl $(4 + \pop), %esp 122ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -(4 + \pop) 123ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 124ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 125ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 126ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 127ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* all the rest are no-op */ 128ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 129ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 130ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 131ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 132ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 133ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 134ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 135ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 136ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 137ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 138ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 139ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#else /* CONFIG_X86_32_LAZY_GS */ 140ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 141ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PUSH_GS 142df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %gs 143ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, 0*/ 144ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 145ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 146ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS pop=0 147df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich98: popl_cfi %gs 148ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_RESTORE gs*/ 149ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .if \pop <> 0 150ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo add $\pop, %esp 151ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo CFI_ADJUST_CFA_OFFSET -\pop 152ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .endif 153ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 154ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro POP_GS_EX 155ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 156ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, (%esp) 157ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 158ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.section __ex_table, "a" 159ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .align 4 160ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .long 98b, 99b 161ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 162ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 163ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 164ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS 165ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo98: mov PT_GS(%esp), %gs 166ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 167ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro PTGS_TO_GS_EX 168ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.pushsection .fixup, "ax" 169ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo99: movl $0, PT_GS(%esp) 170ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo jmp 98b 171ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.section __ex_table, "a" 172ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .align 4 173ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo .long 98b, 99b 174ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.popsection 175ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 176ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 177ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro GS_TO_REG reg 178ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl %gs, \reg 179ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REGISTER gs, \reg*/ 180ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 181ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro REG_TO_PTGS reg 182ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, PT_GS(%esp) 183ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET gs, PT_GS*/ 184ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 185ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro SET_KERNEL_GS reg 18660a5317ff0f42dd313094b88f809f63041568b08Tejun Heo movl $(__KERNEL_STACK_CANARY), \reg 187ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl \reg, %gs 188ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.endm 189ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 190ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo#endif /* CONFIG_X86_32_LAZY_GS */ 191ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo 192f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro SAVE_ALL 193f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cld 194ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PUSH_GS 195df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 196f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET fs, 0;*/ 197df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 198f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET es, 0;*/ 199df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 200f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_REL_OFFSET ds, 0;*/ 201df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 202f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET eax, 0 203df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 204f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebp, 0 205df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 206f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edi, 0 207df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 208f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET esi, 0 209df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 210f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET edx, 0 211df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 212f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ecx, 0 213df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 214f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_REL_OFFSET ebx, 0 215f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__USER_DS), %edx 216f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %ds 217f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %edx, %es 218f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $(__KERNEL_PERCPU), %edx 219464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge movl %edx, %fs 220ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %edx 221f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 223f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RESTORE_INT_REGS 224df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebx 225f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebx 226df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 227f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ecx 228df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edx 229f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edx 230df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %esi 231f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE esi 232df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %edi 233f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE edi 234df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ebp 235f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_RESTORE ebp 236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 237fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE eax 238f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 240ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo.macro RESTORE_REGS pop=0 241f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo RESTORE_INT_REGS 242df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: popl_cfi %ds 243f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE ds;*/ 244df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich2: popl_cfi %es 245f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE es;*/ 246df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich3: popl_cfi %fs 247f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_RESTORE fs;*/ 248ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS \pop 249f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.pushsection .fixup, "ax" 250f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo4: movl $0, (%esp) 251f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 1b 252f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo5: movl $0, (%esp) 253f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 2b 254f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo6: movl $0, (%esp) 255f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jmp 3b 256f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.section __ex_table, "a" 257f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .align 4 258f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 1b, 4b 259f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 2b, 5b 260f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo .long 3b, 6b 261f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 262ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo POP_GS_EX 263f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 265f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_INT_FRAME 266f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 267f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 268f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 3*4 269f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 270fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 271f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 272fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 273f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_EC_FRAME 274f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 275f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 276f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 4*4 277f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, -2*4;*/ 278fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_OFFSET eip, -3*4 279f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 280fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich 281f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro RING0_PTREGS_FRAME 282f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_STARTPROC simple 283f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_SIGNAL_FRAME 284f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, PT_OLDESP-PT_EBX 285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ 286f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eip, PT_EIP-PT_OLDESP 287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ 288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ 289f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET eax, PT_EAX-PT_OLDESP 290f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ebp, PT_EBP-PT_OLDESP 291f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edi, PT_EDI-PT_OLDESP 292f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET esi, PT_ESI-PT_OLDESP 293f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET edx, PT_EDX-PT_OLDESP 294f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_OFFSET ecx, PT_ECX-PT_OLDESP 295eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge CFI_OFFSET ebx, PT_EBX-PT_OLDESP 296f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(ret_from_fork) 299fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC 300df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule_tail 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 303df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 304df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0x0202 # Reset kernel eflags 305df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popfl_cfi 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 307fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 30847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_fork) 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 311a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Interrupt exit functions should be protected against kprobes 312a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 313a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 314a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return to user mode is not as complex as all this looks, 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but we want the default path for a system call return to 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * go as quickly as possible which is why some of this is 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * less clear than it otherwise should be. 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # userspace resumption stub bypassing syscall exit tracing 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 323fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_exception: 325139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell preempt_stop(CLBR_ANY) 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsret_from_intr: 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 3284031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelovcheck_userspace: 329eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS 330eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 331ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax 33278be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $USER_RPL, %eax 33378be3706b21a232310590fe00258b224177ac05fRusty Russell jb resume_kernel # not returning to v8086 or userspace 334f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_userspace) 336c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 337139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 340e32e58a96de4ac35a03349db2ab69f263ded958fPeter Zijlstra TRACE_IRQS_OFF 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done on 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # int/exception return? 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_pending 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp restore_all 34647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(ret_from_exception) 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PREEMPT 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(resume_kernel) 350139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? 3522e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jnz restore_all 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsneed_resched: 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx # need_resched set ? 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 357ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call preempt_schedule_irq 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp need_resched 36147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(resume_kernel) 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 363fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 364a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 365a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 366a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 367a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* SYSENTER_RETURN points to after the "sysenter" instruction in 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # sysenter call handler stub 3730aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENTRY(ia32_sysenter_target) 374fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_STARTPROC simple 375adf1423698f00d00b267f7dca8231340ce7d65efJan Beulich CFI_SIGNAL_FRAME 376fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_DEF_CFA esp, 0 377fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REGISTER esp, ebp 378faca62273b602ab482fb7d3d940dbf41ef08b00eH. Peter Anvin movl TSS_sysenter_sp0(%esp),%esp 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssysenter_past_esp: 38055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar /* 381d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * Interrupts are disabled here, but we can't trace it until 382d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * enough kernel state to call TRACE_IRQS_OFF can be called - but 383d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge * we immediately enable interrupts at that point anyway. 38455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 3853234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_DS 386fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET ss, 0*/ 387df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 388fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET esp, 0 389df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 390d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge orl $X86_EFLAGS_IF, (%esp) 3913234282f33b29d349bcada40204fc7c8fda7fe72Jan Beulich pushl_cfi $__USER_CS 392fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich /*CFI_REL_OFFSET cs, 0*/ 393e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar /* 394e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * Push current_thread_info()->sysenter_return to the stack. 395e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * A tiny bit of offset fixup is necessary - 4*4 means the 4 words 396e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar * pushed above; +8 corresponds to copy_thread's esp0 setting. 397e6e5494cb23d1933735ee47cc674ffe1c4afed6fIngo Molnar */ 39896e612ffc301372d3a3b94e2cb5d1e0c1c207dd1Tetsuo Handa pushl_cfi ((TI_sysenter_return)-THREAD_SIZE_asm+8+4*4)(%esp) 399fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REL_OFFSET eip, 0 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 402d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge SAVE_ALL 403d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge ENABLE_INTERRUPTS(CLBR_NONE) 404d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Load the potential sixth argument from user stack. 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Careful about security. 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $__PAGE_OFFSET-3,%ebp 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_fault 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds1: movl (%ebp),%ebp 412d93c870bad38e8daaaf9f7e900a13431f24becbbJeremy Fitzhardinge movl %ebp,PT_EBP(%esp) 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section __ex_table,"a" 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .align 4 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b,syscall_fault 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 42088200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 421af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz sysenter_audit 422af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_do_call: 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 426eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) 427c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 42842c24fa22e86365055fc931d833f26165e687c19Jeremy Fitzhardinge DISABLE_INTERRUPTS(CLBR_ANY) 42955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 43188200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx 432af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne sysexit_audit 433af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_exit: 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* if something modifies registers it must also disable sysexit */ 435eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EIP(%esp), %edx 436eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_OLDESP(%esp), %ecx 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %ebp,%ebp 43855f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 439464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge1: mov PT_FS(%esp), %fs 440ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS 441d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy Fitzhardinge ENABLE_INTERRUPTS_SYSEXIT 442af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 443af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#ifdef CONFIG_AUDITSYSCALL 444af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysenter_audit: 44588200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) 446af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jnz syscall_trace_entry 447af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath addl $4,%esp 448af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath CFI_ADJUST_CFA_OFFSET -4 449af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ 450af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ 451af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ 452af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ 453af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* 2nd arg: syscall number */ 454af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ 455af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath call audit_syscall_entry 456df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 457af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall number */ 458af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_do_call 459af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 460af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrathsysexit_audit: 46188200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 462af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 463af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_ON 464af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath ENABLE_INTERRUPTS(CLBR_ANY) 465af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl %eax,%edx /* second arg, syscall return value */ 466af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath cmpl $0,%eax /* is it < 0? */ 467af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath setl %al /* 1 if so, 0 if not */ 468af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movzbl %al,%eax /* zero-extend that */ 469af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ 470af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath call audit_syscall_exit 471af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath DISABLE_INTERRUPTS(CLBR_ANY) 472af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath TRACE_IRQS_OFF 473af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl TI_flags(%ebp), %ecx 47488200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx 475af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jne syscall_exit_work 476af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath movl PT_EAX(%esp),%eax /* reload syscall return value */ 477af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath jmp sysenter_exit 478af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath#endif 479af0575bba0f46dd9054d46e0a88c57afad3bf4d2Roland McGrath 480fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 481f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.pushsection .fixup,"ax" 482464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28Jeremy Fitzhardinge2: movl $0,PT_FS(%esp) 483f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge jmp 1b 484f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.section __ex_table,"a" 485f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge .align 4 486f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge .long 1b,2b 487f95d47caae5302a63d92be9a0292abc90e2a14e1Jeremy Fitzhardinge.popsection 488ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo PTGS_TO_GS_EX 4890aa97fb22624f18e5925d702ab0364d3838cfd91Roland McGrathENDPROC(ia32_sysenter_target) 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 492a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * syscall stub including irq exit should be protected against kprobes 493a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 494a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # system call handler stub 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(system_call) 497fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 498df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax # save orig_eax 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 501ed75e8d58010fdc06e2c3a81bfbebae92314c7e3Laurent Vivier # system call tracing in operation / emulation 50288200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz syscall_trace_entry 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jae syscall_badsys 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_call: 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call *sys_call_table(,%eax,4) 508eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl %eax,PT_EAX(%esp) # store the return value 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit: 510c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 511139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 51455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 51688200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_ALLWORK_MASK, %ecx # current->work 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne syscall_exit_work 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_all: 5202e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum TRACE_IRQS_IRET 5212e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelumrestore_all_notrace: 522eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS 523eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge # Warning: PT_OLDSS(%esp) contains the wrong/random values if we 5245df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # are returning to the kernel. 5255df240826c90afdc7956f55a004ea6b702df9203Stas Sergeev # See comments in process.c:copy_thread() for details. 526eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_OLDSS(%esp), %ah 527eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movb PT_CS(%esp), %al 528ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax 52978be3706b21a232310590fe00258b224177ac05fRusty Russell cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax 530fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_REMEMBER_STATE 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds je ldt_ss # returning to user-space with LDT SS 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsrestore_nocheck: 533ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo RESTORE_REGS 4 # skip orig_eax/error_code 534f7f3d791e61d7baf8b0aee0384fdd469c0d2ac9bAdrian Bunkirq_return: 5353701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar INTERRUPT_RETURN 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section .fixup,"ax" 53790e9f53662826db3cdd6d99bd394d727b05160c1Jeremy FitzhardingeENTRY(iret_exc) 538a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $0 # no error code 539a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds pushl $do_iret_error 540a879cbbb34cbecfa9707fbb6e5a00c503ac1ecb9Linus Torvalds jmp error_code 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.section __ex_table,"a" 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .align 4 5443701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar .long irq_return,iret_exc 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.previous 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 547fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_RESTORE_STATE 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsldt_ss: 549eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge larl PT_OLDSS(%esp), %eax 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testl $0x00400000, %eax # returning to 32bit stack? 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz restore_nocheck # allright, normal return 553d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 554d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 555d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell /* 556d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * The kernel can't run on a non-flat stack if paravirt mode 557d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is active. Rather than try to fixup the high bits of 558d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * ESP, bypass this code entirely. This may break DOSemu 559d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * and/or Wine support in a paravirt VM, although the option 560d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * is still available to implement the setting of the high 561d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell * 16-bits in the INTERRUPT_RETURN paravirt-op. 562d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell */ 56393b1eab3d29e7ea32ee583de3362da84db06ded8Jeremy Fitzhardinge cmpl $0, pv_info+PARAVIRT_enabled 564d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell jne restore_nocheck 565d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 566d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 567dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 568dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Setup and switch to ESPFIX stack 569dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 570dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We're returning to userspace with a 16 bit stack. The CPU will not 571dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * restore the high word of ESP for us on executing iret... This is an 572dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * "official" bug of all the x86-compatible CPUs, which we can work 573dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * around to make dosemu and wine happy. We do this by preloading the 574dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * high word of ESP with the high word of the userspace ESP while 575dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * compensating for the offset by changing to the ESPFIX segment with 576dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * a base address that matches for the difference. 577dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 57872c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) 579dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %esp, %edx /* load kernel esp */ 580dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov PT_OLDESP(%esp), %eax /* load userspace esp */ 581dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum mov %dx, %ax /* eax: new kernel esp */ 582dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum sub %eax, %edx /* offset (low word is 0) */ 583dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shr $16, %edx 58472c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ 58572c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ 586df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__ESPFIX_SS 587df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax /* new kernel esp */ 5882e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum /* Disable interrupts, but do not irqtrace this section: we 5892e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * will soon execute iret and the tracer was already set to 5902e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum * the irqstate after the iret */ 591139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_EAX) 592dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to espfix segment */ 593be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev CFI_ADJUST_CFA_OFFSET -8 594be44d2aabce2d62f72d5751d1871b6212bf7a1c7Stas Sergeev jmp restore_nocheck 595fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 59647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(system_call) 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform work that needs to be done immediately before resumption 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 600fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_PTREGS_FRAME # can't unwind into user space anyway 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_pending: 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_notifysig 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_resched: 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call schedule 606c7e872e7da5514d014707a407ea562d197cc0136Peter Zijlstra LOCKDEP_SYS_EXIT 607139ec7c416248b9ea227d21839235344edfee1e0Rusty Russell DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # setting need_resched or sigpending 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # between sampling and the iret 61055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl TI_flags(%ebp), %ecx 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds andl $_TIF_WORK_MASK, %ecx # is there any work to be done other 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # than syscall tracing? 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz restore_all 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds testb $_TIF_NEED_RESCHED, %cl 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnz work_resched 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig: # deal with pending signals and 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # notify-resume requests 62074b47a7844501445d41d704fe7c626f4b1819508Joe Korty#ifdef CONFIG_VM86 621ab68ed98f665436601feec853c8f400d28c39e92Cyrill Gorcunov testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jne work_notifysig_v86 # returning to kernel-space or 6241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # vm86-space 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 6274031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov jmp resume_userspace_sig 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswork_notifysig_v86: 631df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx # save ti_flags for do_notify_resume 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call save_v86_state # %eax contains pt_regs pointer 633df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %ecx 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %eax, %esp 63574b47a7844501445d41d704fe7c626f4b1819508Joe Korty#else 63674b47a7844501445d41d704fe7c626f4b1819508Joe Korty movl %esp, %eax 63774b47a7844501445d41d704fe7c626f4b1819508Joe Korty#endif 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xorl %edx, %edx 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_notify_resume 6404031ff388138b58e5cd472dccce38828bcb8c706Aleksey Gorelov jmp resume_userspace_sig 64147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(work_pending) 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_trace_entry: 646eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 648d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_enter 649d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath /* What it returned is what we'll actually use. */ 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmpl $(nr_syscalls), %eax 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jnae syscall_call 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp syscall_exit 65347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_trace_entry) 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # perform syscall exit tracing 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ALIGN 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_exit_work: 65888200bc28da38bcda1cb1bd218216e83b426d8a8Jaswinder Singh Rajput testl $_TIF_WORK_SYSCALL_EXIT, %ecx 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jz work_pending 66055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_ON 661d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds # schedule() instead 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp, %eax 664d4d67150165df8bf1cc05e532f6efca96f907cabRoland McGrath call syscall_trace_leave 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 66647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_exit_work) 667fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 6681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 669fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME # can't unwind into user space anyway 6701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_fault: 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds GET_THREAD_INFO(%ebp) 672eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-EFAULT,PT_EAX(%esp) 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 67447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_fault) 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_badsys: 677eb5b7b9d86f46b45ba1f986302fdf7df84fb8297Jeremy Fitzhardinge movl $-ENOSYS,PT_EAX(%esp) 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp resume_userspace 67947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(syscall_badsys) 680fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 681a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 682a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 683a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 684a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 686253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst/* 687253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst * System calls that need a pt_regs pointer. 688253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst */ 689e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL0(name) \ 690253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst ALIGN; \ 691253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerstptregs_##name: \ 692253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst leal 4(%esp),%eax; \ 693253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst jmp sys_##name; 694253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 695e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL1(name) \ 696e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 697e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 698e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%edx; \ 699ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 700e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst jmp sys_##name; 701e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 702e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL2(name) \ 703e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 704e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 705e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%ecx; \ 706ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_ECX+4)(%esp),%edx; \ 707ce9119ad90b1caba550447bfcc0a21850558ca49H. Peter Anvin movl (PT_EBX+4)(%esp),%eax; \ 708e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst jmp sys_##name; 709e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 710e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst#define PTREGSCALL3(name) \ 711e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst ALIGN; \ 712e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerstptregs_##name: \ 713a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC; \ 714e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst leal 4(%esp),%eax; \ 715a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax; \ 716e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EDX(%eax),%ecx; \ 717e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_ECX(%eax),%edx; \ 718e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst movl PT_EBX(%eax),%eax; \ 719e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst call sys_##name; \ 720e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst addl $4,%esp; \ 721a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -4; \ 722a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich ret; \ 723a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC; \ 724a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_##name) 725e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian Gerst 72627f59559d63375a4d59e7c720a439d9f0b47edadBrian GerstPTREGSCALL1(iopl) 727e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(fork) 728e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(vfork) 72911cf88bd0b8165b65aaabaee0977e9a3ad474ab7Brian GerstPTREGSCALL3(execve) 730052acad48a566a6dbcccb95e5d22e5e1b7cac8ddBrian GerstPTREGSCALL2(sigaltstack) 731e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(sigreturn) 732e258e4e0b495e6ecbd073d6bef1eafb62a58919aBrian GerstPTREGSCALL0(rt_sigreturn) 733f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL2(vm86) 734f1382f157fb1175bba008abad0907310a1e459ceBrian GerstPTREGSCALL1(vm86old) 735253f29a4ae9cc6cdc7b94f96517f27a93885a6ceBrian Gerst 736f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst/* Clone is an oddball. The 4th arg is in %edi */ 737f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst ALIGN; 738f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerstptregs_clone: 739a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_STARTPROC 740f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst leal 4(%esp),%eax 741a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi %eax 742a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich pushl_cfi PT_EDI(%eax) 743f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EDX(%eax),%ecx 744f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_ECX(%eax),%edx 745f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst movl PT_EBX(%eax),%eax 746f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst call sys_clone 747f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst addl $8,%esp 748a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ADJUST_CFA_OFFSET -8 749f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst ret 750a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan Beulich CFI_ENDPROC 751a34107b5577968dc53cf9c2195c7c2d4a2caf9ceJan BeulichENDPROC(ptregs_clone) 752f839bbc5c81b1c92ff8e81c360e9564f7b961b2eBrian Gerst 753f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIXUP_ESPFIX_STACK 754dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum/* 755dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * Switch back for ESPFIX stack to the normal zerobased stack 756dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * 757dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * We can't call C functions using the ESPFIX stack. This code reads 758dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * the high word of the segment base from the GDT and swiches to the 759dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum * normal stack and adjusts ESP with the matching offset. 760dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum */ 761dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum /* fixup the stack */ 76272c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ 76372c511dd596cff88d6523f231a0fbb8f73006d51Brian Gerst mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ 764dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum shl $16, %eax 765dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum addl %esp, %eax /* the adjusted stack pointer */ 766df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_DS 767df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 768dc4c2a0aed3b09f6e255bd5c3faa50fe6e0b2dedAlexander van Heukelum lss (%esp), %esp /* switch to the normal stack segment */ 769f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_ADJUST_CFA_OFFSET -8 770f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 771f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro UNWIND_ESPFIX_STACK 772f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %ss, %eax 773f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* see if on espfix stack */ 774f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__ESPFIX_SS, %ax 775f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne 27f 776f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl $__KERNEL_DS, %eax 777f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %ds 778f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl %eax, %es 779f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo /* switch to normal stack */ 780f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIXUP_ESPFIX_STACK 781f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo27: 782f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 785b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * Build the entry stubs and pointer table with some assembler magic. 786b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * We pack 7 stubs into a single 32-byte chunk, which will fit in a 787b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin * single cache line on all modern x86 implementations. 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7894687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvin.section .init.rodata,"a" 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(interrupt) 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.text 792b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align 5 793b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(irq_entries_start) 795fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 7964687518c4cb7807fbeff21770e309080f9eb7f2fH. Peter Anvinvector=FIRST_EXTERNAL_VECTOR 797b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin.rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 798b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .balign 32 799b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .rept 7 800b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .if vector < NR_VECTORS 8018665596ec05498525014436520b316ba174a068aH. Peter Anvin .if vector <> FIRST_EXTERNAL_VECTOR 802fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ADJUST_CFA_OFFSET -4 803b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 804df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ 8058665596ec05498525014436520b316ba174a068aH. Peter Anvin .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 806b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin jmp 2f 807b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 808b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .previous 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .long 1b 810b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .text 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvector=vector+1 812b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endif 813b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .endr 814b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin2: jmp common_interrupt 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds.endr 81647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(irq_entries_start) 81747a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich 81847a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 81947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(interrupt) 82047a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich.previous 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 82255f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar/* 82355f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * the CPU automatically disables interrupts when executing an IRQ vector, 82455f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar * so IRQ-flags tracing has to follow that: 82555f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar */ 826b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin .p2align CONFIG_X86_L1_CACHE_SHIFT 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldscommon_interrupt: 828b7c6244f13d37592003b46e12500a90e9781ad9dH. Peter Anvin addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SAVE_ALL 83055f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds call do_IRQ 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp ret_from_intr 83447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(common_interrupt) 835fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 837a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 838a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * Irq entries should be protected against kprobes 839a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 840a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .pushsection .kprobes.text, "ax" 84102cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT3(name, nr, fn) \ 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(name) \ 843fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME; \ 844df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $~(nr); \ 845fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich SAVE_ALL; \ 84655f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar TRACE_IRQS_OFF \ 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds movl %esp,%eax; \ 84802cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo call fn; \ 84955f327fa9e876758491a82af7491104f1cc3fc4dIngo Molnar jmp ret_from_intr; \ 85047a55cd795656d11bb18a7885583361f02a6baa8Jan Beulich CFI_ENDPROC; \ 85147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichENDPROC(name) 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 85302cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo#define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) 85402cf94c370e0dc9bf408fe45eb86fe9ad58eaf7fTejun Heo 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* The include is where all of the SMP etc. interrupts come from */ 8561164dd0099c0d79146a55319670f57ab7ad1d352Ingo Molnar#include <asm/entry_arch.h> 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_error) 859fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 860df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 861df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_error 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 863fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 86447a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_error) 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(simd_coprocessor_error) 867fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 868df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 86940d2e76315da38993129090dc5d56377e573c312Brian Gerst#ifdef CONFIG_X86_INVD_BUG 87040d2e76315da38993129090dc5d56377e573c312Brian Gerst /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ 871df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich661: pushl_cfi $do_general_protection 87240d2e76315da38993129090dc5d56377e573c312Brian Gerst662: 87340d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstructions,"a" 87440d2e76315da38993129090dc5d56377e573c312Brian Gerst .balign 4 87540d2e76315da38993129090dc5d56377e573c312Brian Gerst .long 661b 87640d2e76315da38993129090dc5d56377e573c312Brian Gerst .long 663f 87783a7a2ad2a9173dcabc05df0f01d1d85b7ba1c2cH. Peter Anvin .word X86_FEATURE_XMM 87840d2e76315da38993129090dc5d56377e573c312Brian Gerst .byte 662b-661b 87940d2e76315da38993129090dc5d56377e573c312Brian Gerst .byte 664f-663f 88040d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 88140d2e76315da38993129090dc5d56377e573c312Brian Gerst.section .altinstr_replacement,"ax" 88240d2e76315da38993129090dc5d56377e573c312Brian Gerst663: pushl $do_simd_coprocessor_error 88340d2e76315da38993129090dc5d56377e573c312Brian Gerst664: 88440d2e76315da38993129090dc5d56377e573c312Brian Gerst.previous 88540d2e76315da38993129090dc5d56377e573c312Brian Gerst#else 886df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_simd_coprocessor_error 88740d2e76315da38993129090dc5d56377e573c312Brian Gerst#endif 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 889fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(simd_coprocessor_error) 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(device_not_available) 893fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 894df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 895df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_device_not_available 8967643e9b936b4af31ba4851eb7d5b3a3bfad52502Alexander van Heukelum jmp error_code 897fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 89847a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(device_not_available) 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 900d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#ifdef CONFIG_PARAVIRT 901d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty RussellENTRY(native_iret) 9023701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar iret 903d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell.section __ex_table,"a" 904d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell .align 4 9053701d863b43d05ffeb223d269583398f914fb5d3Ingo Molnar .long native_iret, iret_exc 906d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell.previous 90747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(native_iret) 908d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 909d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeENTRY(native_irq_enable_sysexit) 910d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sti 911d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell sysexit 912d75cd22fdd5f7d203fb60014d426942df33dd9a6Jeremy FitzhardingeEND(native_irq_enable_sysexit) 913d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell#endif 914d3561b7fa0fb0fc583bab0eeda32bec9e4c4056dRusty Russell 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(overflow) 916fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 917df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 918df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_overflow 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 920fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(overflow) 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(bounds) 924fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 925df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 926df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_bounds 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 928fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 92947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(bounds) 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_op) 932fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 933df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 934df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_op 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 936fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 93747a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_op) 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(coprocessor_segment_overrun) 940fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 941df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 942df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_coprocessor_segment_overrun 9431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 944fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 94547a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(coprocessor_segment_overrun) 9461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(invalid_TSS) 948fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 949df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_invalid_TSS 9501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 951fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95247a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(invalid_TSS) 9531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(segment_not_present) 955fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 956df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_segment_not_present 9571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 958fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 95947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(segment_not_present) 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(stack_segment) 962fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 963df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_stack_segment 9641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 965fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 96647a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(stack_segment) 9671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(alignment_check) 969fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_EC_FRAME 970df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_alignment_check 9711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 972fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 97347a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(alignment_check) 9741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 975d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.PENTRY(divide_error) 976d28c4393a7bf558538e9def269c1caeab6ec056fPrasanna S.P RING0_INT_FRAME 977df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 # no error code 978df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_divide_error 9791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 980fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 98147a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(divide_error) 9821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_X86_MCE 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(machine_check) 985fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 986df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 987df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi machine_check_vector 9881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 989fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 99047a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(machine_check) 9911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 9921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsENTRY(spurious_interrupt_bug) 994fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich RING0_INT_FRAME 995df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 996df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_spurious_interrupt_bug 9971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds jmp error_code 998fe7cacc1c25e286872b878c5d46880b620cd1e2dJan Beulich CFI_ENDPROC 99947a55cd795656d11bb18a7885583361f02a6baa8Jan BeulichEND(spurious_interrupt_bug) 1000a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu/* 1001a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu * End of kprobes section 1002a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu */ 1003a00e817f42663941ea0aa5f85a9d1c4f8b212839Masami Hiramatsu .popsection 10041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 100502ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENTRY(kernel_thread_helper) 100602ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen pushl $0 # fake return address for unwinder 100702ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_STARTPROC 1008e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst movl %edi,%eax 1009e840227c141116171c89ab1abb5cc9fee6fdb488Brian Gerst call *%esi 101002ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen call do_exit 10115f5db591326779a80cfe490c5d6b6ce9fac08b31jia zhang ud2 # padding for call trace 101202ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen CFI_ENDPROC 101302ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi KleenENDPROC(kernel_thread_helper) 101402ba1a32dbd3d406530a17a2643a8f0f8cbf3accAndi Kleen 10155ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#ifdef CONFIG_XEN 1016e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge/* Xen doesn't set %esp to be precisely what the normal sysenter 1017e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge entrypoint expects, so fix it up before using the normal path. */ 1018e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_sysenter_target) 1019e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge RING0_INT_FRAME 1020e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge addl $5*4, %esp /* remove xen-provided frame */ 10212ddf9b7b3e6660199269e34cfa27148440ddc3bfJan Beulich CFI_ADJUST_CFA_OFFSET -5*4 1022e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge jmp sysenter_past_esp 1023557d7d4e294ee6fb1db0cb6c1ec97a1c908b880dGlauber Costa CFI_ENDPROC 1024e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 10255ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_hypervisor_callback) 10265ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1027df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $0 10285ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10295ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge TRACE_IRQS_OFF 10309ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10319ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge /* Check to see if we got the event in the critical 10329ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge region in xen_iret_direct, after we've reenabled 10339ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge events and checked for pending events. This simulates 10349ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge iret instruction's behaviour where it delivers a 10359ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge pending interrupt when enabling interrupts. */ 10369ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge movl PT_EIP(%esp),%eax 10379ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_start_crit,%eax 10389ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jb 1f 10399ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge cmpl $xen_iret_end_crit,%eax 10409ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge jae 1f 10419ec2b804e099e8a326369e6cccab10dee1d172eeJeremy Fitzhardinge 10420f2c87695219b1129ccf93e0f58acdcdd49724b9Jeremy Fitzhardinge jmp xen_iret_crit_fixup 1043e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy Fitzhardinge 1044e2a81baf6604a2e08e10c7405b0349106f77c8afJeremy FitzhardingeENTRY(xen_do_upcall) 1045b77797fb2bf31bf076e6b69736119bc6a077525bJeremy Fitzhardinge1: mov %esp, %eax 10465ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge call xen_evtchn_do_upcall 10475ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_intr 10485ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10495ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_hypervisor_callback) 10505ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10515ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Hypervisor uses this for application faults while it executes. 10525ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We get here for two reasons: 10535ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 1. Fault while reloading DS, ES, FS or GS 10545ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# 2. Fault while executing IRET 10555ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 1 we fix up by reattempting the load, and zeroing the segment 10565ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# register if the load fails. 10575ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# Category 2 we fix up by jumping to do_iret_error. We cannot use the 10585ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# normal Linux return path in this case because if we use the IRET hypercall 10595ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# to pop the stack frame we end up in an infinite loop of failsafe callbacks. 10605ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge# We distinguish between categories by maintaining a status value in EAX. 10615ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENTRY(xen_failsafe_callback) 10625ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_STARTPROC 1063df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 10645ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl $1,%eax 10655ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge1: mov 4(%esp),%ds 10665ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge2: mov 8(%esp),%es 10675ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge3: mov 12(%esp),%fs 10685ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge4: mov 16(%esp),%gs 10695ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge testl %eax,%eax 1070df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 10715ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge lea 16(%esp),%esp 10725ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ADJUST_CFA_OFFSET -16 10735ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jz 5f 10745ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge addl $16,%esp 10755ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) 1076df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich5: pushl_cfi $0 # EAX == 0 => Category 1 (Bad segment) 10775ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge SAVE_ALL 10785ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp ret_from_exception 10795ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge CFI_ENDPROC 10805ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 10815ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section .fixup,"ax" 10825ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge6: xorl %eax,%eax 10835ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,4(%esp) 10845ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 1b 10855ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge7: xorl %eax,%eax 10865ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,8(%esp) 10875ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 2b 10885ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge8: xorl %eax,%eax 10895ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,12(%esp) 10905ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 3b 10915ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge9: xorl %eax,%eax 10925ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge movl %eax,16(%esp) 10935ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge jmp 4b 10945ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 10955ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.section __ex_table,"a" 10965ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .align 4 10975ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 1b,6b 10985ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 2b,7b 10995ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 3b,8b 11005ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge .long 4b,9b 11015ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge.previous 11025ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy FitzhardingeENDPROC(xen_failsafe_callback) 11035ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 110438e20b07efd541a959de367dc90a17f92ce2e8a6Sheng YangBUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, 110538e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang xen_evtchn_do_upcall) 110638e20b07efd541a959de367dc90a17f92ce2e8a6Sheng Yang 11075ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge#endif /* CONFIG_XEN */ 11085ead97c84fa7d63a6a7a2f4e9f18f452bd109045Jeremy Fitzhardinge 1109606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#ifdef CONFIG_FUNCTION_TRACER 1110d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#ifdef CONFIG_DYNAMIC_FTRACE 1111d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1112d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(mcount) 1113d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1114d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(mcount) 1115d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1116d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtENTRY(ftrace_caller) 111760a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 111860a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 111960a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 1120d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %eax 1121d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %ecx 1122d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt pushl %edx 1123d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0xc(%esp), %eax 1124d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt movl 0x4(%ebp), %edx 1125395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 1126d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1127d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_call 1128d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_call: 1129d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call ftrace_stub 1130d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1131d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %edx 1132d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %ecx 1133d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt popl %eax 11345a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#ifdef CONFIG_FUNCTION_GRAPH_TRACER 11355a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt.globl ftrace_graph_call 11365a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedtftrace_graph_call: 11375a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt jmp ftrace_stub 11385a45cfe1c64862e8cd3b0d79d7c4ba71c3118915Steven Rostedt#endif 1139d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1140d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt.globl ftrace_stub 1141d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedtftrace_stub: 1142d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt ret 1143d61f82d06672f57fca410da6f7fffd15867db622Steven RostedtEND(ftrace_caller) 1144d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 1145d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#else /* ! CONFIG_DYNAMIC_FTRACE */ 1146d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt 114716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloENTRY(mcount) 114860a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt cmpl $0, function_trace_stop 114960a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt jne ftrace_stub 115060a7ecf42661f2b22168751298592da6ee210c9eSteven Rostedt 115116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo cmpl $ftrace_stub, ftrace_trace_function 115216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jnz trace 1153fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1154c2324b694fa8ffee382a124198c68754088e483cIngo Molnar cmpl $ftrace_stub, ftrace_graph_return 1155fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker jnz ftrace_graph_caller 1156e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt 1157e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt cmpl $ftrace_graph_entry_stub, ftrace_graph_entry 1158e49dc19c6a19ea112fcb94b7c62ec62cdd5c08aaSteven Rostedt jnz ftrace_graph_caller 1159caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker#endif 116016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo.globl ftrace_stub 116116444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Meloftrace_stub: 116216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo ret 116316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 116416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo /* taken from glibc */ 116516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melotrace: 116616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %eax 116716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %ecx 116816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo pushl %edx 116916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0xc(%esp), %eax 117016444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo movl 0x4(%ebp), %edx 1171395a59d0f8e86bb39cd700c3d185d30c670bb958Abhishek Sagar subl $MCOUNT_INSN_SIZE, %eax 117216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1173d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt call *ftrace_trace_function 117416444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 117516444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %edx 117616444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %ecx 117716444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo popl %eax 117816444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo jmp ftrace_stub 117916444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de MeloEND(mcount) 1180d61f82d06672f57fca410da6f7fffd15867db622Steven Rostedt#endif /* CONFIG_DYNAMIC_FTRACE */ 1181606576ce816603d9fe1fb453a88bc6eea16ca709Steven Rostedt#endif /* CONFIG_FUNCTION_TRACER */ 118216444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1183fb52607afcd0629776f1dc9e657647ceae81dd50Frederic Weisbecker#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1184fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerENTRY(ftrace_graph_caller) 1185e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker cmpl $0, function_trace_stop 1186e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker jne ftrace_stub 1187e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker 1188caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1189caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %ecx 1190caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 11911dc1c6adf38bc5799d1594681645ced40ced4b6bFrederic Weisbecker movl 0xc(%esp), %edx 1192caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker lea 0x4(%ebp), %eax 119371e308a239c098673570d0b417d42262bb535909Steven Rostedt movl (%ebp), %ecx 1194bb4304c71c97bf727ec43cd2f195c2c237c27fd3Steven Rostedt subl $MCOUNT_INSN_SIZE, %edx 1195caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call prepare_ftrace_return 1196caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1197caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %ecx 1198caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1199e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker ret 1200fb52607afcd0629776f1dc9e657647ceae81dd50Frederic WeisbeckerEND(ftrace_graph_caller) 1201caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker 1202caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker.globl return_to_handler 1203caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbeckerreturn_to_handler: 1204caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %eax 1205caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker pushl %edx 120671e308a239c098673570d0b417d42262bb535909Steven Rostedt movl %ebp, %eax 1207caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker call ftrace_return_to_handler 1208194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt movl %eax, %ecx 1209caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %edx 1210caf4b323b02a16c92fba449952ac6515ddc76d7aFrederic Weisbecker popl %eax 1211194ec34184869f0de1cf255c924fc5299e1b3d27Steven Rostedt jmp *%ecx 1212e7d3737ea1b102030f44e96c97754101e41515f0Frederic Weisbecker#endif 121316444a8a40d4c7b4f6de34af0cae1f76a4f6c901Arnaldo Carvalho de Melo 1214bb152f53120d66c98c1f16518407df6a84f23714Arjan van de Ven.section .rodata,"a" 1215541054d935a1ec89916977cbf0d16ddb71b3ff5cThomas Gleixner#include "syscall_table_32.S" 12161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssyscall_table_size=(.-sys_call_table) 1218d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1219d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1220d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Some functions should be protected against kprobes 1221d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1222d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .pushsection .kprobes.text, "ax" 1223d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1224d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(page_fault) 1225d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1226df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_page_fault 1227d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ALIGN 1228d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumerror_code: 1229ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /* the function address is in %gs's slot on the stack */ 1230df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %fs 1231ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo /*CFI_REL_OFFSET fs, 0*/ 1232df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %es 1233d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET es, 0*/ 1234df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ds 1235d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /*CFI_REL_OFFSET ds, 0*/ 1236df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1237d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eax, 0 1238df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebp 1239d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebp, 0 1240df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edi 1241d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edi, 0 1242df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esi 1243d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET esi, 0 1244df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %edx 1245d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET edx, 0 1246df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ecx 1247d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ecx, 0 1248df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ebx 1249d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET ebx, 0 1250d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cld 1251d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__KERNEL_PERCPU), %ecx 1252d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %fs 1253d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum UNWIND_ESPFIX_STACK 1254ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo GS_TO_REG %ecx 1255ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo movl PT_GS(%esp), %edi # get the function address 1256d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl PT_ORIG_EAX(%esp), %edx # get the error code 1257d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart 1258ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo REG_TO_PTGS %ecx 1259ccbeed3a05908d201b47b6c3dd1a373138bba566Tejun Heo SET_KERNEL_GS %ecx 1260d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl $(__USER_DS), %ecx 1261d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %ds 1262d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ecx, %es 1263d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1264d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1265d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call *%edi 1266d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1267d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1268d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(page_fault) 1269d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1270d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1271d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * Debug traps and NMI can happen at the one SYSENTER instruction 1272d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * that sets up the real kernel stack. Check here, since we can't 1273d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * allow the wrong stack to be used. 1274d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1275d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have 1276d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * already pushed 3 words if it hits on the sysenter instruction: 1277d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * eflags, cs and eip. 1278d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1279d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * We just load the right stack, and push the three (known) values 1280d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * by hand onto the new stack - while updating the return eip past 1281d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * the instruction that would have done it for sysenter. 1282d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1283f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.macro FIX_STACK offset ok label 1284f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo cmpw $__KERNEL_CS, 4(%esp) 1285f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo jne \ok 1286f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo\label: 1287f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo movl TSS_sysenter_sp0 + \offset(%esp), %esp 1288f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_DEF_CFA esp, 0 1289f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo CFI_UNDEFINED eip 1290df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushfl_cfi 1291df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $__KERNEL_CS 1292df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $sysenter_past_esp 1293d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_REL_OFFSET eip, 0 1294f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo.endm 1295d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1296d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(debug) 1297d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1298d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1299d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne debug_stack_correct 1300f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn 1301d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumdebug_stack_correct: 1302df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1303d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1304d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1305d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # error code 0 1306d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1307d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_debug 1308d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1309d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1310d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(debug) 1311d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1312d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1313d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI is doubly nasty. It can happen _while_ we're handling 1314d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * a debug fault, and the debug fault hasn't yet been able to 1315d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * clear up the stack. So we first check whether we got an 1316d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * NMI on the sysenter entry path, but after that we need to 1317d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * check whether we got an NMI on the debug path where the debug 1318d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * fault happened on the sysenter path. 1319d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1320d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(nmi) 1321d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1322df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1323d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %ss, %eax 1324d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__ESPFIX_SS, %ax 1325df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1326d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_espfix_stack 1327d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,(%esp) 1328d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_stack_fixup 1329df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1330d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax 1331d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* Do not access memory above the end of our stack page, 1332d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * it might not exist. 1333d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1334d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum andl $(THREAD_SIZE-1),%eax 1335d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $(THREAD_SIZE-20),%eax 1336df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich popl_cfi %eax 1337d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jae nmi_stack_correct 1338d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $ia32_sysenter_target,12(%esp) 1339d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum je nmi_debug_stack_check 1340d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_correct: 1341d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1342df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1343d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1344d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1345d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1346d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 13472e04bc76560decd9270be2a805927316f617ef56Alexander van Heukelum jmp restore_all_notrace 1348d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1349d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1350d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_stack_fixup: 1351d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1352f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 12, nmi_stack_correct, 1 1353d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1354d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1355d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_debug_stack_check: 1356d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here */ 1357d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpw $__KERNEL_CS,16(%esp) 1358d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jne nmi_stack_correct 1359d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug,(%esp) 1360d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jb nmi_stack_correct 1361d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum cmpl $debug_esp_fix_insn,(%esp) 1362d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum ja nmi_stack_correct 1363f0d96110f9fd98a1a22e03b8adba69508843d910Tejun Heo FIX_STACK 24, nmi_stack_correct, 1 1364d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp nmi_stack_correct 1365d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1366d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelumnmi_espfix_stack: 1367d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* We have a RING0_INT_FRAME here. 1368d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * 1369d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * create the pointer to lss back 1370d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1371df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %ss 1372df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %esp 1373bda3a89745d7bb88d3e735046c0cdc3d0eb2ac24Stas Sergeev addl $4, (%esp) 1374d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum /* copy the iret frame of 12 bytes */ 1375d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .rept 3 1376df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi 16(%esp) 1377d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .endr 1378df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi %eax 1379d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1380d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum FIXUP_ESPFIX_STACK # %eax == %esp 1381d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1382d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_nmi 1383d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RESTORE_REGS 1384d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum lss 12+4(%esp), %esp # back to espfix stack 1385d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ADJUST_CFA_OFFSET -24 1386d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp irq_return 1387d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1388d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(nmi) 1389d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1390d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(int3) 1391d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_INT_FRAME 1392df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $-1 # mark this as an int 1393d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum SAVE_ALL 1394d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum TRACE_IRQS_OFF 1395d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum xorl %edx,%edx # zero error code 1396d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum movl %esp,%eax # pt_regs pointer 1397d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum call do_int3 1398d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp ret_from_exception 1399d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1400d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(int3) 1401d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1402d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumENTRY(general_protection) 1403d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum RING0_EC_FRAME 1404df5d1874ce1a1f0e0eceff4fa3a9d45620243a68Jan Beulich pushl_cfi $do_general_protection 1405d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum jmp error_code 1406d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum CFI_ENDPROC 1407d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van HeukelumEND(general_protection) 1408d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum 1409631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#ifdef CONFIG_KVM_GUEST 1410631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb NatapovENTRY(async_page_fault) 1411631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov RING0_EC_FRAME 1412631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov pushl $do_async_page_fault 1413631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov CFI_ADJUST_CFA_OFFSET 4 1414631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov jmp error_code 1415631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov CFI_ENDPROC 1416631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb NatapovEND(apf_page_fault) 1417631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov#endif 1418631bc4878220932fe67fc46fc7cf7cccdb1ec597Gleb Natapov 1419d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum/* 1420d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum * End of kprobes section 1421d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum */ 1422d211af055d0c12dc3416c2886e6fbdc6eb74a381Alexander van Heukelum .popsection 1423