Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | */ |
| 5 | |
| 6 | /* |
| 7 | * entry.S contains the system-call and fault low-level handling routines. |
| 8 | * This also contains the timer-interrupt handler, as well as all interrupts |
| 9 | * and faults that can result in a task-switch. |
| 10 | * |
| 11 | * NOTE: This code handles signal-recognition, which happens every time |
| 12 | * after a timer-interrupt and after each system call. |
| 13 | * |
| 14 | * I changed all the .align's to 4 (16 byte alignment), as that's faster |
| 15 | * on a 486. |
| 16 | * |
Andi Kleen | 889f21c | 2007-05-02 19:27:19 +0200 | [diff] [blame] | 17 | * Stack layout in 'syscall_exit': |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * ptrace needs to have all regs on the stack. |
| 19 | * if the order here is changed, it needs to be |
| 20 | * updated in fork.c:copy_process, signal.c:do_signal, |
| 21 | * ptrace.c and ptrace.h |
| 22 | * |
| 23 | * 0(%esp) - %ebx |
| 24 | * 4(%esp) - %ecx |
| 25 | * 8(%esp) - %edx |
| 26 | * C(%esp) - %esi |
| 27 | * 10(%esp) - %edi |
| 28 | * 14(%esp) - %ebp |
| 29 | * 18(%esp) - %eax |
| 30 | * 1C(%esp) - %ds |
| 31 | * 20(%esp) - %es |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 32 | * 24(%esp) - %fs |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 33 | * 28(%esp) - orig_eax |
| 34 | * 2C(%esp) - %eip |
| 35 | * 30(%esp) - %cs |
| 36 | * 34(%esp) - %eflags |
| 37 | * 38(%esp) - %oldesp |
| 38 | * 3C(%esp) - %oldss |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | * |
| 40 | * "current" is in register %ebx during any slow entries. |
| 41 | */ |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/linkage.h> |
| 44 | #include <asm/thread_info.h> |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 45 | #include <asm/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <asm/errno.h> |
| 47 | #include <asm/segment.h> |
| 48 | #include <asm/smp.h> |
| 49 | #include <asm/page.h> |
| 50 | #include <asm/desc.h> |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 51 | #include <asm/percpu.h> |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 52 | #include <asm/dwarf2.h> |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 53 | #include <asm/processor-flags.h> |
Thomas Gleixner | 9b7dc56 | 2008-05-02 20:10:09 +0200 | [diff] [blame] | 54 | #include <asm/irq_vectors.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 56 | /* |
| 57 | * We use macros for low-level operations which need to be overridden |
| 58 | * for paravirtualization. The following will never clobber any registers: |
| 59 | * INTERRUPT_RETURN (aka. "iret") |
| 60 | * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") |
Jeremy Fitzhardinge | d75cd22f | 2008-06-25 00:19:26 -0400 | [diff] [blame^] | 61 | * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 62 | * |
| 63 | * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must |
| 64 | * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). |
| 65 | * Allowing a register to be clobbered can shrink the paravirt replacement |
| 66 | * enough to patch inline, increasing performance. |
| 67 | */ |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #define nr_syscalls ((syscall_table_size)/4) |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #ifdef CONFIG_PREEMPT |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 72 | #define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #else |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 74 | #define preempt_stop(clobbers) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #define resume_kernel restore_nocheck |
| 76 | #endif |
| 77 | |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 78 | .macro TRACE_IRQS_IRET |
| 79 | #ifdef CONFIG_TRACE_IRQFLAGS |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 80 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 81 | jz 1f |
| 82 | TRACE_IRQS_ON |
| 83 | 1: |
| 84 | #endif |
| 85 | .endm |
| 86 | |
Aleksey Gorelov | 4031ff3 | 2006-06-27 02:53:48 -0700 | [diff] [blame] | 87 | #ifdef CONFIG_VM86 |
| 88 | #define resume_userspace_sig check_userspace |
| 89 | #else |
| 90 | #define resume_userspace_sig resume_userspace |
| 91 | #endif |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #define SAVE_ALL \ |
| 94 | cld; \ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 95 | pushl %fs; \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 96 | CFI_ADJUST_CFA_OFFSET 4;\ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 97 | /*CFI_REL_OFFSET fs, 0;*/\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | pushl %es; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 99 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 100 | /*CFI_REL_OFFSET es, 0;*/\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | pushl %ds; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 102 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 103 | /*CFI_REL_OFFSET ds, 0;*/\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | pushl %eax; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 105 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 106 | CFI_REL_OFFSET eax, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | pushl %ebp; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 108 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 109 | CFI_REL_OFFSET ebp, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | pushl %edi; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 111 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 112 | CFI_REL_OFFSET edi, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | pushl %esi; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 114 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 115 | CFI_REL_OFFSET esi, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | pushl %edx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 117 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 118 | CFI_REL_OFFSET edx, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | pushl %ecx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 120 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 121 | CFI_REL_OFFSET ecx, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | pushl %ebx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 123 | CFI_ADJUST_CFA_OFFSET 4;\ |
| 124 | CFI_REL_OFFSET ebx, 0;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | movl $(__USER_DS), %edx; \ |
| 126 | movl %edx, %ds; \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 127 | movl %edx, %es; \ |
Jeremy Fitzhardinge | 7c3576d | 2007-05-02 19:27:16 +0200 | [diff] [blame] | 128 | movl $(__KERNEL_PERCPU), %edx; \ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 129 | movl %edx, %fs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | #define RESTORE_INT_REGS \ |
| 132 | popl %ebx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 133 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 134 | CFI_RESTORE ebx;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | popl %ecx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 136 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 137 | CFI_RESTORE ecx;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | popl %edx; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 139 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 140 | CFI_RESTORE edx;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | popl %esi; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 142 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 143 | CFI_RESTORE esi;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | popl %edi; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 145 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 146 | CFI_RESTORE edi;\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | popl %ebp; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 148 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 149 | CFI_RESTORE ebp;\ |
| 150 | popl %eax; \ |
| 151 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 152 | CFI_RESTORE eax |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | #define RESTORE_REGS \ |
| 155 | RESTORE_INT_REGS; \ |
| 156 | 1: popl %ds; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 157 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 158 | /*CFI_RESTORE ds;*/\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | 2: popl %es; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 160 | CFI_ADJUST_CFA_OFFSET -4;\ |
| 161 | /*CFI_RESTORE es;*/\ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 162 | 3: popl %fs; \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 163 | CFI_ADJUST_CFA_OFFSET -4;\ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 164 | /*CFI_RESTORE fs;*/\ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 165 | .pushsection .fixup,"ax"; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | 4: movl $0,(%esp); \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 167 | jmp 1b; \ |
| 168 | 5: movl $0,(%esp); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | jmp 2b; \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 170 | 6: movl $0,(%esp); \ |
| 171 | jmp 3b; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | .section __ex_table,"a";\ |
| 173 | .align 4; \ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 174 | .long 1b,4b; \ |
| 175 | .long 2b,5b; \ |
| 176 | .long 3b,6b; \ |
| 177 | .popsection |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 179 | #define RING0_INT_FRAME \ |
| 180 | CFI_STARTPROC simple;\ |
Jan Beulich | adf1423 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 181 | CFI_SIGNAL_FRAME;\ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 182 | CFI_DEF_CFA esp, 3*4;\ |
| 183 | /*CFI_OFFSET cs, -2*4;*/\ |
| 184 | CFI_OFFSET eip, -3*4 |
| 185 | |
| 186 | #define RING0_EC_FRAME \ |
| 187 | CFI_STARTPROC simple;\ |
Jan Beulich | adf1423 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 188 | CFI_SIGNAL_FRAME;\ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 189 | CFI_DEF_CFA esp, 4*4;\ |
| 190 | /*CFI_OFFSET cs, -2*4;*/\ |
| 191 | CFI_OFFSET eip, -3*4 |
| 192 | |
| 193 | #define RING0_PTREGS_FRAME \ |
| 194 | CFI_STARTPROC simple;\ |
Jan Beulich | adf1423 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 195 | CFI_SIGNAL_FRAME;\ |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 196 | CFI_DEF_CFA esp, PT_OLDESP-PT_EBX;\ |
| 197 | /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/\ |
| 198 | CFI_OFFSET eip, PT_EIP-PT_OLDESP;\ |
| 199 | /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/\ |
| 200 | /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/\ |
| 201 | CFI_OFFSET eax, PT_EAX-PT_OLDESP;\ |
| 202 | CFI_OFFSET ebp, PT_EBP-PT_OLDESP;\ |
| 203 | CFI_OFFSET edi, PT_EDI-PT_OLDESP;\ |
| 204 | CFI_OFFSET esi, PT_ESI-PT_OLDESP;\ |
| 205 | CFI_OFFSET edx, PT_EDX-PT_OLDESP;\ |
| 206 | CFI_OFFSET ecx, PT_ECX-PT_OLDESP;\ |
| 207 | CFI_OFFSET ebx, PT_EBX-PT_OLDESP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | ENTRY(ret_from_fork) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 210 | CFI_STARTPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | pushl %eax |
Markus Armbruster | 25d7dfd | 2006-07-30 03:04:08 -0700 | [diff] [blame] | 212 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | call schedule_tail |
| 214 | GET_THREAD_INFO(%ebp) |
| 215 | popl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 216 | CFI_ADJUST_CFA_OFFSET -4 |
Linus Torvalds | 47a5c6f | 2006-09-18 16:20:40 -0700 | [diff] [blame] | 217 | pushl $0x0202 # Reset kernel eflags |
| 218 | CFI_ADJUST_CFA_OFFSET 4 |
| 219 | popfl |
| 220 | CFI_ADJUST_CFA_OFFSET -4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | jmp syscall_exit |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 222 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 223 | END(ret_from_fork) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | /* |
| 226 | * Return to user mode is not as complex as all this looks, |
| 227 | * but we want the default path for a system call return to |
| 228 | * go as quickly as possible which is why some of this is |
| 229 | * less clear than it otherwise should be. |
| 230 | */ |
| 231 | |
| 232 | # userspace resumption stub bypassing syscall exit tracing |
| 233 | ALIGN |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 234 | RING0_PTREGS_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | ret_from_exception: |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 236 | preempt_stop(CLBR_ANY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | ret_from_intr: |
| 238 | GET_THREAD_INFO(%ebp) |
Aleksey Gorelov | 4031ff3 | 2006-06-27 02:53:48 -0700 | [diff] [blame] | 239 | check_userspace: |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 240 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
| 241 | movb PT_CS(%esp), %al |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 242 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
Rusty Russell | 78be370 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 243 | cmpl $USER_RPL, %eax |
| 244 | jb resume_kernel # not returning to v8086 or userspace |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | ENTRY(resume_userspace) |
Peter Zijlstra | c7e872e | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 247 | LOCKDEP_SYS_EXIT |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 248 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | # setting need_resched or sigpending |
| 250 | # between sampling and the iret |
Peter Zijlstra | e32e58a | 2008-06-06 10:14:08 +0200 | [diff] [blame] | 251 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | movl TI_flags(%ebp), %ecx |
| 253 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on |
| 254 | # int/exception return? |
| 255 | jne work_pending |
| 256 | jmp restore_all |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 257 | END(ret_from_exception) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | #ifdef CONFIG_PREEMPT |
| 260 | ENTRY(resume_kernel) |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 261 | DISABLE_INTERRUPTS(CLBR_ANY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? |
| 263 | jnz restore_nocheck |
| 264 | need_resched: |
| 265 | movl TI_flags(%ebp), %ecx # need_resched set ? |
| 266 | testb $_TIF_NEED_RESCHED, %cl |
| 267 | jz restore_all |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 268 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | jz restore_all |
| 270 | call preempt_schedule_irq |
| 271 | jmp need_resched |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 272 | END(resume_kernel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | #endif |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 274 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | /* SYSENTER_RETURN points to after the "sysenter" instruction in |
| 277 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ |
| 278 | |
| 279 | # sysenter call handler stub |
Roland McGrath | 0aa97fb22 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 280 | ENTRY(ia32_sysenter_target) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 281 | CFI_STARTPROC simple |
Jan Beulich | adf1423 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 282 | CFI_SIGNAL_FRAME |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 283 | CFI_DEF_CFA esp, 0 |
| 284 | CFI_REGISTER esp, ebp |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 285 | movl TSS_sysenter_sp0(%esp),%esp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | sysenter_past_esp: |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 287 | /* |
Jeremy Fitzhardinge | d93c870b | 2008-03-24 16:43:21 -0700 | [diff] [blame] | 288 | * Interrupts are disabled here, but we can't trace it until |
| 289 | * enough kernel state to call TRACE_IRQS_OFF can be called - but |
| 290 | * we immediately enable interrupts at that point anyway. |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 291 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | pushl $(__USER_DS) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 293 | CFI_ADJUST_CFA_OFFSET 4 |
| 294 | /*CFI_REL_OFFSET ss, 0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | pushl %ebp |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 296 | CFI_ADJUST_CFA_OFFSET 4 |
| 297 | CFI_REL_OFFSET esp, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | pushfl |
Jeremy Fitzhardinge | d93c870b | 2008-03-24 16:43:21 -0700 | [diff] [blame] | 299 | orl $X86_EFLAGS_IF, (%esp) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 300 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | pushl $(__USER_CS) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 302 | CFI_ADJUST_CFA_OFFSET 4 |
| 303 | /*CFI_REL_OFFSET cs, 0*/ |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 304 | /* |
| 305 | * Push current_thread_info()->sysenter_return to the stack. |
| 306 | * A tiny bit of offset fixup is necessary - 4*4 means the 4 words |
| 307 | * pushed above; +8 corresponds to copy_thread's esp0 setting. |
| 308 | */ |
| 309 | pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 310 | CFI_ADJUST_CFA_OFFSET 4 |
| 311 | CFI_REL_OFFSET eip, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Jeremy Fitzhardinge | d93c870b | 2008-03-24 16:43:21 -0700 | [diff] [blame] | 313 | pushl %eax |
| 314 | CFI_ADJUST_CFA_OFFSET 4 |
| 315 | SAVE_ALL |
| 316 | ENABLE_INTERRUPTS(CLBR_NONE) |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | /* |
| 319 | * Load the potential sixth argument from user stack. |
| 320 | * Careful about security. |
| 321 | */ |
| 322 | cmpl $__PAGE_OFFSET-3,%ebp |
| 323 | jae syscall_fault |
| 324 | 1: movl (%ebp),%ebp |
Jeremy Fitzhardinge | d93c870b | 2008-03-24 16:43:21 -0700 | [diff] [blame] | 325 | movl %ebp,PT_EBP(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | .section __ex_table,"a" |
| 327 | .align 4 |
| 328 | .long 1b,syscall_fault |
| 329 | .previous |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | GET_THREAD_INFO(%ebp) |
| 332 | |
| 333 | /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ |
Laurent Vivier | ed75e8d | 2005-09-03 15:57:18 -0700 | [diff] [blame] | 334 | testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | jnz syscall_trace_entry |
| 336 | cmpl $(nr_syscalls), %eax |
| 337 | jae syscall_badsys |
| 338 | call *sys_call_table(,%eax,4) |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 339 | movl %eax,PT_EAX(%esp) |
Peter Zijlstra | c7e872e | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 340 | LOCKDEP_SYS_EXIT |
Jeremy Fitzhardinge | 42c24fa | 2007-05-02 19:27:14 +0200 | [diff] [blame] | 341 | DISABLE_INTERRUPTS(CLBR_ANY) |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 342 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | movl TI_flags(%ebp), %ecx |
| 344 | testw $_TIF_ALLWORK_MASK, %cx |
| 345 | jne syscall_exit_work |
| 346 | /* if something modifies registers it must also disable sysexit */ |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 347 | movl PT_EIP(%esp), %edx |
| 348 | movl PT_OLDESP(%esp), %ecx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | xorl %ebp,%ebp |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 350 | TRACE_IRQS_ON |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 351 | 1: mov PT_FS(%esp), %fs |
Jeremy Fitzhardinge | d75cd22f | 2008-06-25 00:19:26 -0400 | [diff] [blame^] | 352 | ENABLE_INTERRUPTS_SYSEXIT |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 353 | CFI_ENDPROC |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 354 | .pushsection .fixup,"ax" |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 355 | 2: movl $0,PT_FS(%esp) |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 356 | jmp 1b |
| 357 | .section __ex_table,"a" |
| 358 | .align 4 |
| 359 | .long 1b,2b |
| 360 | .popsection |
Roland McGrath | 0aa97fb22 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 361 | ENDPROC(ia32_sysenter_target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | # system call handler stub |
| 364 | ENTRY(system_call) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 365 | RING0_INT_FRAME # can't unwind into user space anyway |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | pushl %eax # save orig_eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 367 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | SAVE_ALL |
| 369 | GET_THREAD_INFO(%ebp) |
Laurent Vivier | ed75e8d | 2005-09-03 15:57:18 -0700 | [diff] [blame] | 370 | # system call tracing in operation / emulation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ |
Laurent Vivier | ed75e8d | 2005-09-03 15:57:18 -0700 | [diff] [blame] | 372 | testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | jnz syscall_trace_entry |
| 374 | cmpl $(nr_syscalls), %eax |
| 375 | jae syscall_badsys |
| 376 | syscall_call: |
| 377 | call *sys_call_table(,%eax,4) |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 378 | movl %eax,PT_EAX(%esp) # store the return value |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | syscall_exit: |
Peter Zijlstra | c7e872e | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 380 | LOCKDEP_SYS_EXIT |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 381 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | # setting need_resched or sigpending |
| 383 | # between sampling and the iret |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 384 | TRACE_IRQS_OFF |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 385 | testl $X86_EFLAGS_TF,PT_EFLAGS(%esp) # If tracing set singlestep flag on exit |
Jason Wessel | 1e2e99f | 2007-07-06 02:39:50 -0700 | [diff] [blame] | 386 | jz no_singlestep |
| 387 | orl $_TIF_SINGLESTEP,TI_flags(%ebp) |
| 388 | no_singlestep: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | movl TI_flags(%ebp), %ecx |
| 390 | testw $_TIF_ALLWORK_MASK, %cx # current->work |
| 391 | jne syscall_exit_work |
| 392 | |
| 393 | restore_all: |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 394 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
| 395 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we |
Stas Sergeev | 5df2408 | 2005-04-16 15:24:01 -0700 | [diff] [blame] | 396 | # are returning to the kernel. |
| 397 | # See comments in process.c:copy_thread() for details. |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 398 | movb PT_OLDSS(%esp), %ah |
| 399 | movb PT_CS(%esp), %al |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 400 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
Rusty Russell | 78be370 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 401 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 402 | CFI_REMEMBER_STATE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | je ldt_ss # returning to user-space with LDT SS |
| 404 | restore_nocheck: |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 405 | TRACE_IRQS_IRET |
| 406 | restore_nocheck_notrace: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | RESTORE_REGS |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 408 | addl $4, %esp # skip orig_eax/error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 409 | CFI_ADJUST_CFA_OFFSET -4 |
Adrian Bunk | f7f3d79 | 2008-02-13 23:29:53 +0200 | [diff] [blame] | 410 | irq_return: |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 411 | INTERRUPT_RETURN |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | .section .fixup,"ax" |
Jeremy Fitzhardinge | 90e9f53 | 2008-03-17 16:37:12 -0700 | [diff] [blame] | 413 | ENTRY(iret_exc) |
Linus Torvalds | a879cbb | 2005-04-29 09:38:44 -0700 | [diff] [blame] | 414 | pushl $0 # no error code |
| 415 | pushl $do_iret_error |
| 416 | jmp error_code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | .previous |
| 418 | .section __ex_table,"a" |
| 419 | .align 4 |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 420 | .long irq_return,iret_exc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | .previous |
| 422 | |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 423 | CFI_RESTORE_STATE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | ldt_ss: |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 425 | larl PT_OLDSS(%esp), %eax |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | jnz restore_nocheck |
| 427 | testl $0x00400000, %eax # returning to 32bit stack? |
| 428 | jnz restore_nocheck # allright, normal return |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 429 | |
| 430 | #ifdef CONFIG_PARAVIRT |
| 431 | /* |
| 432 | * The kernel can't run on a non-flat stack if paravirt mode |
| 433 | * is active. Rather than try to fixup the high bits of |
| 434 | * ESP, bypass this code entirely. This may break DOSemu |
| 435 | * and/or Wine support in a paravirt VM, although the option |
| 436 | * is still available to implement the setting of the high |
| 437 | * 16-bits in the INTERRUPT_RETURN paravirt-op. |
| 438 | */ |
Jeremy Fitzhardinge | 93b1eab | 2007-10-16 11:51:29 -0700 | [diff] [blame] | 439 | cmpl $0, pv_info+PARAVIRT_enabled |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 440 | jne restore_nocheck |
| 441 | #endif |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* If returning to userspace with 16bit stack, |
| 444 | * try to fix the higher word of ESP, as the CPU |
| 445 | * won't restore it. |
| 446 | * This is an "official" bug of all the x86-compatible |
| 447 | * CPUs, which we can try to work around to make |
| 448 | * dosemu and wine happy. */ |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 449 | movl PT_OLDESP(%esp), %eax |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 450 | movl %esp, %edx |
| 451 | call patch_espfix_desc |
| 452 | pushl $__ESPFIX_SS |
| 453 | CFI_ADJUST_CFA_OFFSET 4 |
| 454 | pushl %eax |
| 455 | CFI_ADJUST_CFA_OFFSET 4 |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 456 | DISABLE_INTERRUPTS(CLBR_EAX) |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 457 | TRACE_IRQS_OFF |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 458 | lss (%esp), %esp |
| 459 | CFI_ADJUST_CFA_OFFSET -8 |
| 460 | jmp restore_nocheck |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 461 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 462 | ENDPROC(system_call) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | # perform work that needs to be done immediately before resumption |
| 465 | ALIGN |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 466 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | work_pending: |
| 468 | testb $_TIF_NEED_RESCHED, %cl |
| 469 | jz work_notifysig |
| 470 | work_resched: |
| 471 | call schedule |
Peter Zijlstra | c7e872e | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 472 | LOCKDEP_SYS_EXIT |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 473 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | # setting need_resched or sigpending |
| 475 | # between sampling and the iret |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 476 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | movl TI_flags(%ebp), %ecx |
| 478 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other |
| 479 | # than syscall tracing? |
| 480 | jz restore_all |
| 481 | testb $_TIF_NEED_RESCHED, %cl |
| 482 | jnz work_resched |
| 483 | |
| 484 | work_notifysig: # deal with pending signals and |
| 485 | # notify-resume requests |
Joe Korty | 74b47a7 | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 486 | #ifdef CONFIG_VM86 |
Cyrill Gorcunov | ab68ed9 | 2008-03-25 22:16:32 +0300 | [diff] [blame] | 487 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | movl %esp, %eax |
| 489 | jne work_notifysig_v86 # returning to kernel-space or |
| 490 | # vm86-space |
| 491 | xorl %edx, %edx |
| 492 | call do_notify_resume |
Aleksey Gorelov | 4031ff3 | 2006-06-27 02:53:48 -0700 | [diff] [blame] | 493 | jmp resume_userspace_sig |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | ALIGN |
| 496 | work_notifysig_v86: |
| 497 | pushl %ecx # save ti_flags for do_notify_resume |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 498 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | call save_v86_state # %eax contains pt_regs pointer |
| 500 | popl %ecx |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 501 | CFI_ADJUST_CFA_OFFSET -4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | movl %eax, %esp |
Joe Korty | 74b47a7 | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 503 | #else |
| 504 | movl %esp, %eax |
| 505 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | xorl %edx, %edx |
| 507 | call do_notify_resume |
Aleksey Gorelov | 4031ff3 | 2006-06-27 02:53:48 -0700 | [diff] [blame] | 508 | jmp resume_userspace_sig |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 509 | END(work_pending) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | # perform syscall exit tracing |
| 512 | ALIGN |
| 513 | syscall_trace_entry: |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 514 | movl $-ENOSYS,PT_EAX(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | movl %esp, %eax |
| 516 | xorl %edx,%edx |
| 517 | call do_syscall_trace |
Laurent Vivier | ed75e8d | 2005-09-03 15:57:18 -0700 | [diff] [blame] | 518 | cmpl $0, %eax |
Paolo 'Blaisorblade' Giarrusso | 640aa46 | 2005-09-03 15:57:22 -0700 | [diff] [blame] | 519 | jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU, |
Laurent Vivier | ed75e8d | 2005-09-03 15:57:18 -0700 | [diff] [blame] | 520 | # so must skip actual syscall |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 521 | movl PT_ORIG_EAX(%esp), %eax |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | cmpl $(nr_syscalls), %eax |
| 523 | jnae syscall_call |
| 524 | jmp syscall_exit |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 525 | END(syscall_trace_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | # perform syscall exit tracing |
| 528 | ALIGN |
| 529 | syscall_exit_work: |
| 530 | testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl |
| 531 | jz work_pending |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 532 | TRACE_IRQS_ON |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 533 | ENABLE_INTERRUPTS(CLBR_ANY) # could let do_syscall_trace() call |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | # schedule() instead |
| 535 | movl %esp, %eax |
| 536 | movl $1, %edx |
| 537 | call do_syscall_trace |
| 538 | jmp resume_userspace |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 539 | END(syscall_exit_work) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 540 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 542 | RING0_INT_FRAME # can't unwind into user space anyway |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | syscall_fault: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | GET_THREAD_INFO(%ebp) |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 545 | movl $-EFAULT,PT_EAX(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | jmp resume_userspace |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 547 | END(syscall_fault) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | syscall_badsys: |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 550 | movl $-ENOSYS,PT_EAX(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | jmp resume_userspace |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 552 | END(syscall_badsys) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 553 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | #define FIXUP_ESPFIX_STACK \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 556 | /* since we are on a wrong stack, we cant make it a C code :( */ \ |
Jeremy Fitzhardinge | 7a61d35 | 2007-05-02 19:27:15 +0200 | [diff] [blame] | 557 | PER_CPU(gdt_page, %ebx); \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 558 | GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah); \ |
| 559 | addl %esp, %eax; \ |
| 560 | pushl $__KERNEL_DS; \ |
| 561 | CFI_ADJUST_CFA_OFFSET 4; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | pushl %eax; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 563 | CFI_ADJUST_CFA_OFFSET 4; \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 564 | lss (%esp), %esp; \ |
| 565 | CFI_ADJUST_CFA_OFFSET -8; |
| 566 | #define UNWIND_ESPFIX_STACK \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | movl %ss, %eax; \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 568 | /* see if on espfix stack */ \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | cmpw $__ESPFIX_SS, %ax; \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 570 | jne 27f; \ |
| 571 | movl $__KERNEL_DS, %eax; \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 572 | movl %eax, %ds; \ |
| 573 | movl %eax, %es; \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 574 | /* switch to normal stack */ \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 575 | FIXUP_ESPFIX_STACK; \ |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 576 | 27:; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
| 578 | /* |
| 579 | * Build the entry stubs and pointer table with |
| 580 | * some assembler magic. |
| 581 | */ |
Jan Beulich | 3e7622f | 2008-01-30 13:31:23 +0100 | [diff] [blame] | 582 | .section .rodata,"a" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | ENTRY(interrupt) |
| 584 | .text |
| 585 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | ENTRY(irq_entries_start) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 587 | RING0_INT_FRAME |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 588 | vector=0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | .rept NR_IRQS |
| 590 | ALIGN |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 591 | .if vector |
| 592 | CFI_ADJUST_CFA_OFFSET -4 |
| 593 | .endif |
Rusty Russell | 19eadf9 | 2006-06-27 02:53:44 -0700 | [diff] [blame] | 594 | 1: pushl $~(vector) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 595 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | jmp common_interrupt |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 597 | .previous |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | .long 1b |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 599 | .text |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | vector=vector+1 |
| 601 | .endr |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 602 | END(irq_entries_start) |
| 603 | |
| 604 | .previous |
| 605 | END(interrupt) |
| 606 | .previous |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 608 | /* |
| 609 | * the CPU automatically disables interrupts when executing an IRQ vector, |
| 610 | * so IRQ-flags tracing has to follow that: |
| 611 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | ALIGN |
| 613 | common_interrupt: |
| 614 | SAVE_ALL |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 615 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | movl %esp,%eax |
| 617 | call do_IRQ |
| 618 | jmp ret_from_intr |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 619 | ENDPROC(common_interrupt) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 620 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
| 622 | #define BUILD_INTERRUPT(name, nr) \ |
| 623 | ENTRY(name) \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 624 | RING0_INT_FRAME; \ |
Rusty Russell | 19eadf9 | 2006-06-27 02:53:44 -0700 | [diff] [blame] | 625 | pushl $~(nr); \ |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 626 | CFI_ADJUST_CFA_OFFSET 4; \ |
| 627 | SAVE_ALL; \ |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 628 | TRACE_IRQS_OFF \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | movl %esp,%eax; \ |
Jeremy Fitzhardinge | f76c392 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 630 | call smp_##name; \ |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 631 | jmp ret_from_intr; \ |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 632 | CFI_ENDPROC; \ |
| 633 | ENDPROC(name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
| 635 | /* The include is where all of the SMP etc. interrupts come from */ |
| 636 | #include "entry_arch.h" |
| 637 | |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 638 | KPROBE_ENTRY(page_fault) |
| 639 | RING0_EC_FRAME |
| 640 | pushl $do_page_fault |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 641 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | ALIGN |
| 643 | error_code: |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 644 | /* the function address is in %fs's slot on the stack */ |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 645 | pushl %es |
| 646 | CFI_ADJUST_CFA_OFFSET 4 |
| 647 | /*CFI_REL_OFFSET es, 0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | pushl %ds |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 649 | CFI_ADJUST_CFA_OFFSET 4 |
| 650 | /*CFI_REL_OFFSET ds, 0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | pushl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 652 | CFI_ADJUST_CFA_OFFSET 4 |
| 653 | CFI_REL_OFFSET eax, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | pushl %ebp |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 655 | CFI_ADJUST_CFA_OFFSET 4 |
| 656 | CFI_REL_OFFSET ebp, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | pushl %edi |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 658 | CFI_ADJUST_CFA_OFFSET 4 |
| 659 | CFI_REL_OFFSET edi, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | pushl %esi |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 661 | CFI_ADJUST_CFA_OFFSET 4 |
| 662 | CFI_REL_OFFSET esi, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | pushl %edx |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 664 | CFI_ADJUST_CFA_OFFSET 4 |
| 665 | CFI_REL_OFFSET edx, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | pushl %ecx |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 667 | CFI_ADJUST_CFA_OFFSET 4 |
| 668 | CFI_REL_OFFSET ecx, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | pushl %ebx |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 670 | CFI_ADJUST_CFA_OFFSET 4 |
| 671 | CFI_REL_OFFSET ebx, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | cld |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 673 | pushl %fs |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 674 | CFI_ADJUST_CFA_OFFSET 4 |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 675 | /*CFI_REL_OFFSET fs, 0*/ |
Jeremy Fitzhardinge | 7c3576d | 2007-05-02 19:27:16 +0200 | [diff] [blame] | 676 | movl $(__KERNEL_PERCPU), %ecx |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 677 | movl %ecx, %fs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | UNWIND_ESPFIX_STACK |
| 679 | popl %ecx |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 680 | CFI_ADJUST_CFA_OFFSET -4 |
| 681 | /*CFI_REGISTER es, ecx*/ |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 682 | movl PT_FS(%esp), %edi # get the function address |
Jeremy Fitzhardinge | eb5b7b9 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 683 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
Jeremy Fitzhardinge | f95d47c | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 684 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart |
Jeremy Fitzhardinge | 464d1a7 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 685 | mov %ecx, PT_FS(%esp) |
| 686 | /*CFI_REL_OFFSET fs, ES*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | movl $(__USER_DS), %ecx |
| 688 | movl %ecx, %ds |
| 689 | movl %ecx, %es |
| 690 | movl %esp,%eax # pt_regs pointer |
| 691 | call *%edi |
| 692 | jmp ret_from_exception |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 693 | CFI_ENDPROC |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 694 | KPROBE_END(page_fault) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | ENTRY(coprocessor_error) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 697 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 699 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | pushl $do_coprocessor_error |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 701 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 703 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 704 | END(coprocessor_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
| 706 | ENTRY(simd_coprocessor_error) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 707 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 709 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | pushl $do_simd_coprocessor_error |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 711 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 713 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 714 | END(simd_coprocessor_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
| 716 | ENTRY(device_not_available) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 717 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | pushl $-1 # mark this as an int |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 719 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | SAVE_ALL |
Rusty Russell | 0da5db3 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 721 | GET_CR0_INTO_EAX |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | testl $0x4, %eax # EM (math emulation bit) |
| 723 | jne device_not_available_emulate |
Rusty Russell | 139ec7c | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 724 | preempt_stop(CLBR_ANY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | call math_state_restore |
| 726 | jmp ret_from_exception |
| 727 | device_not_available_emulate: |
| 728 | pushl $0 # temporary storage for ORIG_EIP |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 729 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | call math_emulate |
| 731 | addl $4, %esp |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 732 | CFI_ADJUST_CFA_OFFSET -4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | jmp ret_from_exception |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 734 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 735 | END(device_not_available) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | |
| 737 | /* |
| 738 | * Debug traps and NMI can happen at the one SYSENTER instruction |
| 739 | * that sets up the real kernel stack. Check here, since we can't |
| 740 | * allow the wrong stack to be used. |
| 741 | * |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 742 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | * already pushed 3 words if it hits on the sysenter instruction: |
| 744 | * eflags, cs and eip. |
| 745 | * |
| 746 | * We just load the right stack, and push the three (known) values |
| 747 | * by hand onto the new stack - while updating the return eip past |
| 748 | * the instruction that would have done it for sysenter. |
| 749 | */ |
| 750 | #define FIX_STACK(offset, ok, label) \ |
| 751 | cmpw $__KERNEL_CS,4(%esp); \ |
| 752 | jne ok; \ |
| 753 | label: \ |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 754 | movl TSS_sysenter_sp0+offset(%esp),%esp; \ |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 755 | CFI_DEF_CFA esp, 0; \ |
| 756 | CFI_UNDEFINED eip; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | pushfl; \ |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 758 | CFI_ADJUST_CFA_OFFSET 4; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | pushl $__KERNEL_CS; \ |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 760 | CFI_ADJUST_CFA_OFFSET 4; \ |
| 761 | pushl $sysenter_past_esp; \ |
| 762 | CFI_ADJUST_CFA_OFFSET 4; \ |
| 763 | CFI_REL_OFFSET eip, 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Prasanna S Panchamukhi | 3d97ae5 | 2005-09-06 15:19:27 -0700 | [diff] [blame] | 765 | KPROBE_ENTRY(debug) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 766 | RING0_INT_FRAME |
Roland McGrath | 0aa97fb22 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 767 | cmpl $ia32_sysenter_target,(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | jne debug_stack_correct |
| 769 | FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn) |
| 770 | debug_stack_correct: |
| 771 | pushl $-1 # mark this as an int |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 772 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | SAVE_ALL |
| 774 | xorl %edx,%edx # error code 0 |
| 775 | movl %esp,%eax # pt_regs pointer |
| 776 | call do_debug |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | jmp ret_from_exception |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 778 | CFI_ENDPROC |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 779 | KPROBE_END(debug) |
| 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | /* |
| 782 | * NMI is doubly nasty. It can happen _while_ we're handling |
| 783 | * a debug fault, and the debug fault hasn't yet been able to |
| 784 | * clear up the stack. So we first check whether we got an |
| 785 | * NMI on the sysenter entry path, but after that we need to |
| 786 | * check whether we got an NMI on the debug path where the debug |
| 787 | * fault happened on the sysenter path. |
| 788 | */ |
Fernando Luis Vázquez Cao | 0603975 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 789 | KPROBE_ENTRY(nmi) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 790 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | pushl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 792 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | movl %ss, %eax |
| 794 | cmpw $__ESPFIX_SS, %ax |
| 795 | popl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 796 | CFI_ADJUST_CFA_OFFSET -4 |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 797 | je nmi_espfix_stack |
Roland McGrath | 0aa97fb22 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 798 | cmpl $ia32_sysenter_target,(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | je nmi_stack_fixup |
| 800 | pushl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 801 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | movl %esp,%eax |
| 803 | /* Do not access memory above the end of our stack page, |
| 804 | * it might not exist. |
| 805 | */ |
| 806 | andl $(THREAD_SIZE-1),%eax |
| 807 | cmpl $(THREAD_SIZE-20),%eax |
| 808 | popl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 809 | CFI_ADJUST_CFA_OFFSET -4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | jae nmi_stack_correct |
Roland McGrath | 0aa97fb22 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 811 | cmpl $ia32_sysenter_target,12(%esp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | je nmi_debug_stack_check |
| 813 | nmi_stack_correct: |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 814 | /* We have a RING0_INT_FRAME here */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | pushl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 816 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | SAVE_ALL |
| 818 | xorl %edx,%edx # zero error code |
| 819 | movl %esp,%eax # pt_regs pointer |
| 820 | call do_nmi |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 821 | jmp restore_nocheck_notrace |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 822 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | nmi_stack_fixup: |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 825 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | FIX_STACK(12,nmi_stack_correct, 1) |
| 827 | jmp nmi_stack_correct |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | nmi_debug_stack_check: |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 830 | /* We have a RING0_INT_FRAME here */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | cmpw $__KERNEL_CS,16(%esp) |
| 832 | jne nmi_stack_correct |
Jan Beulich | e271820 | 2005-11-13 16:06:52 -0800 | [diff] [blame] | 833 | cmpl $debug,(%esp) |
| 834 | jb nmi_stack_correct |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | cmpl $debug_esp_fix_insn,(%esp) |
Jan Beulich | e271820 | 2005-11-13 16:06:52 -0800 | [diff] [blame] | 836 | ja nmi_stack_correct |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | FIX_STACK(24,nmi_stack_correct, 1) |
| 838 | jmp nmi_stack_correct |
| 839 | |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 840 | nmi_espfix_stack: |
Chuck Ebbert | a549b86 | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 841 | /* We have a RING0_INT_FRAME here. |
| 842 | * |
| 843 | * create the pointer to lss back |
| 844 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | pushl %ss |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 846 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | pushl %esp |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 848 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | addw $4, (%esp) |
| 850 | /* copy the iret frame of 12 bytes */ |
| 851 | .rept 3 |
| 852 | pushl 16(%esp) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 853 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | .endr |
| 855 | pushl %eax |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 856 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | SAVE_ALL |
| 858 | FIXUP_ESPFIX_STACK # %eax == %esp |
| 859 | xorl %edx,%edx # zero error code |
| 860 | call do_nmi |
| 861 | RESTORE_REGS |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 862 | lss 12+4(%esp), %esp # back to espfix stack |
| 863 | CFI_ADJUST_CFA_OFFSET -24 |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 864 | jmp irq_return |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 865 | CFI_ENDPROC |
Fernando Luis Vázquez Cao | 0603975 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 866 | KPROBE_END(nmi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 868 | #ifdef CONFIG_PARAVIRT |
| 869 | ENTRY(native_iret) |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 870 | iret |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 871 | .section __ex_table,"a" |
| 872 | .align 4 |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 873 | .long native_iret, iret_exc |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 874 | .previous |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 875 | END(native_iret) |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 876 | |
Jeremy Fitzhardinge | d75cd22f | 2008-06-25 00:19:26 -0400 | [diff] [blame^] | 877 | ENTRY(native_irq_enable_sysexit) |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 878 | sti |
| 879 | sysexit |
Jeremy Fitzhardinge | d75cd22f | 2008-06-25 00:19:26 -0400 | [diff] [blame^] | 880 | END(native_irq_enable_sysexit) |
Rusty Russell | d3561b7 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 881 | #endif |
| 882 | |
Prasanna S Panchamukhi | 3d97ae5 | 2005-09-06 15:19:27 -0700 | [diff] [blame] | 883 | KPROBE_ENTRY(int3) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 884 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | pushl $-1 # mark this as an int |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 886 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | SAVE_ALL |
| 888 | xorl %edx,%edx # zero error code |
| 889 | movl %esp,%eax # pt_regs pointer |
| 890 | call do_int3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | jmp ret_from_exception |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 892 | CFI_ENDPROC |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 893 | KPROBE_END(int3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
| 895 | ENTRY(overflow) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 896 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 898 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | pushl $do_overflow |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 900 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 902 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 903 | END(overflow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | ENTRY(bounds) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 906 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 908 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | pushl $do_bounds |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 910 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 912 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 913 | END(bounds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
| 915 | ENTRY(invalid_op) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 916 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 918 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | pushl $do_invalid_op |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 920 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 922 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 923 | END(invalid_op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | ENTRY(coprocessor_segment_overrun) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 926 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 928 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | pushl $do_coprocessor_segment_overrun |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 930 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 932 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 933 | END(coprocessor_segment_overrun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | ENTRY(invalid_TSS) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 936 | RING0_EC_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | pushl $do_invalid_TSS |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 938 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 940 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 941 | END(invalid_TSS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
| 943 | ENTRY(segment_not_present) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 944 | RING0_EC_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | pushl $do_segment_not_present |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 946 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 948 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 949 | END(segment_not_present) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
| 951 | ENTRY(stack_segment) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 952 | RING0_EC_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | pushl $do_stack_segment |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 954 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 956 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 957 | END(stack_segment) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
Prasanna S Panchamukhi | 3d97ae5 | 2005-09-06 15:19:27 -0700 | [diff] [blame] | 959 | KPROBE_ENTRY(general_protection) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 960 | RING0_EC_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | pushl $do_general_protection |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 962 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 964 | CFI_ENDPROC |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 965 | KPROBE_END(general_protection) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | ENTRY(alignment_check) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 968 | RING0_EC_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | pushl $do_alignment_check |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 970 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 972 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 973 | END(alignment_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 975 | ENTRY(divide_error) |
| 976 | RING0_INT_FRAME |
| 977 | pushl $0 # no error code |
| 978 | CFI_ADJUST_CFA_OFFSET 4 |
| 979 | pushl $do_divide_error |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 980 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 982 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 983 | END(divide_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | #ifdef CONFIG_X86_MCE |
| 986 | ENTRY(machine_check) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 987 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 989 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | pushl machine_check_vector |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 991 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 993 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 994 | END(machine_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | #endif |
| 996 | |
| 997 | ENTRY(spurious_interrupt_bug) |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 998 | RING0_INT_FRAME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | pushl $0 |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 1000 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | pushl $do_spurious_interrupt_bug |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 1002 | CFI_ADJUST_CFA_OFFSET 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | jmp error_code |
Jan Beulich | fe7cacc | 2006-06-26 13:57:44 +0200 | [diff] [blame] | 1004 | CFI_ENDPROC |
Jan Beulich | 47a55cd | 2007-02-13 13:26:24 +0100 | [diff] [blame] | 1005 | END(spurious_interrupt_bug) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
Andi Kleen | 02ba1a3 | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 1007 | ENTRY(kernel_thread_helper) |
| 1008 | pushl $0 # fake return address for unwinder |
| 1009 | CFI_STARTPROC |
| 1010 | movl %edx,%eax |
| 1011 | push %edx |
| 1012 | CFI_ADJUST_CFA_OFFSET 4 |
| 1013 | call *%ebx |
| 1014 | push %eax |
| 1015 | CFI_ADJUST_CFA_OFFSET 4 |
| 1016 | call do_exit |
| 1017 | CFI_ENDPROC |
| 1018 | ENDPROC(kernel_thread_helper) |
| 1019 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1020 | #ifdef CONFIG_XEN |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 1021 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
| 1022 | entrypoint expects, so fix it up before using the normal path. */ |
| 1023 | ENTRY(xen_sysenter_target) |
| 1024 | RING0_INT_FRAME |
| 1025 | addl $5*4, %esp /* remove xen-provided frame */ |
| 1026 | jmp sysenter_past_esp |
| 1027 | |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1028 | ENTRY(xen_hypervisor_callback) |
| 1029 | CFI_STARTPROC |
| 1030 | pushl $0 |
| 1031 | CFI_ADJUST_CFA_OFFSET 4 |
| 1032 | SAVE_ALL |
| 1033 | TRACE_IRQS_OFF |
Jeremy Fitzhardinge | 9ec2b80 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1034 | |
| 1035 | /* Check to see if we got the event in the critical |
| 1036 | region in xen_iret_direct, after we've reenabled |
| 1037 | events and checked for pending events. This simulates |
| 1038 | iret instruction's behaviour where it delivers a |
| 1039 | pending interrupt when enabling interrupts. */ |
| 1040 | movl PT_EIP(%esp),%eax |
| 1041 | cmpl $xen_iret_start_crit,%eax |
| 1042 | jb 1f |
| 1043 | cmpl $xen_iret_end_crit,%eax |
| 1044 | jae 1f |
| 1045 | |
Jeremy Fitzhardinge | 0f2c876 | 2008-03-17 16:37:22 -0700 | [diff] [blame] | 1046 | jmp xen_iret_crit_fixup |
Jeremy Fitzhardinge | 9ec2b80 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1047 | |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 1048 | ENTRY(xen_do_upcall) |
Jeremy Fitzhardinge | b77797f | 2008-04-02 10:54:11 -0700 | [diff] [blame] | 1049 | 1: mov %esp, %eax |
Jeremy Fitzhardinge | 5ead97c | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 1050 | call xen_evtchn_do_upcall |
| 1051 | jmp ret_from_intr |
| 1052 | CFI_ENDPROC |
| 1053 | ENDPROC(xen_hypervisor_callback) |
| 1054 | |
| 1055 | # Hypervisor uses this for application faults while it executes. |
| 1056 | # We get here for two reasons: |
| 1057 | # 1. Fault while reloading DS, ES, FS or GS |
| 1058 | # 2. Fault while executing IRET |
| 1059 | # Category 1 we fix up by reattempting the load, and zeroing the segment |
| 1060 | # register if the load fails. |
| 1061 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the |
| 1062 | # normal Linux return path in this case because if we use the IRET hypercall |
| 1063 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. |
| 1064 | # We distinguish between categories by maintaining a status value in EAX. |
| 1065 | ENTRY(xen_failsafe_callback) |
| 1066 | CFI_STARTPROC |
| 1067 | pushl %eax |
| 1068 | CFI_ADJUST_CFA_OFFSET 4 |
| 1069 | movl $1,%eax |
| 1070 | 1: mov 4(%esp),%ds |
| 1071 | 2: mov 8(%esp),%es |
| 1072 | 3: mov 12(%esp),%fs |
| 1073 | 4: mov 16(%esp),%gs |
| 1074 | testl %eax,%eax |
| 1075 | popl %eax |
| 1076 | CFI_ADJUST_CFA_OFFSET -4 |
| 1077 | lea 16(%esp),%esp |
| 1078 | CFI_ADJUST_CFA_OFFSET -16 |
| 1079 | jz 5f |
| 1080 | addl $16,%esp |
| 1081 | jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) |
| 1082 | 5: pushl $0 # EAX == 0 => Category 1 (Bad segment) |
| 1083 | CFI_ADJUST_CFA_OFFSET 4 |
| 1084 | SAVE_ALL |
| 1085 | jmp ret_from_exception |
| 1086 | CFI_ENDPROC |
| 1087 | |
| 1088 | .section .fixup,"ax" |
| 1089 | 6: xorl %eax,%eax |
| 1090 | movl %eax,4(%esp) |
| 1091 | jmp 1b |
| 1092 | 7: xorl %eax,%eax |
| 1093 | movl %eax,8(%esp) |
| 1094 | jmp 2b |
| 1095 | 8: xorl %eax,%eax |
| 1096 | movl %eax,12(%esp) |
| 1097 | jmp 3b |
| 1098 | 9: xorl %eax,%eax |
| 1099 | movl %eax,16(%esp) |
| 1100 | jmp 4b |
| 1101 | .previous |
| 1102 | .section __ex_table,"a" |
| 1103 | .align 4 |
| 1104 | .long 1b,6b |
| 1105 | .long 2b,7b |
| 1106 | .long 3b,8b |
| 1107 | .long 4b,9b |
| 1108 | .previous |
| 1109 | ENDPROC(xen_failsafe_callback) |
| 1110 | |
| 1111 | #endif /* CONFIG_XEN */ |
| 1112 | |
Arjan van de Ven | bb152f5 | 2006-01-06 00:12:05 -0800 | [diff] [blame] | 1113 | .section .rodata,"a" |
Thomas Gleixner | 541054d | 2007-10-11 11:12:00 +0200 | [diff] [blame] | 1114 | #include "syscall_table_32.S" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | syscall_table_size=(.-sys_call_table) |