Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/entry.S |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs |
| 6 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * entry.S contains the system-call and fault low-level handling routines. |
| 11 | * |
| 12 | * NOTE: This code handles signal-recognition, which happens every time |
| 13 | * after an interrupt and after each system call. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 14 | * |
| 15 | * Normal syscalls and interrupts don't save a full stack frame, this is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * only done for syscall tracing, signals or fork/exec et.al. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 17 | * |
| 18 | * A note on terminology: |
| 19 | * - top of stack: Architecture defined interrupt frame from SS to RIP |
| 20 | * at the top of the kernel process stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * - partial stack frame: partially saved registers upto R11. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 22 | * - full stack frame: Like partial stack frame, but all register saved. |
Andi Kleen | 2e91a17 | 2006-09-26 10:52:29 +0200 | [diff] [blame] | 23 | * |
| 24 | * Some macro usage: |
| 25 | * - CFI macros are used to generate dwarf2 unwind information for better |
| 26 | * backtraces. They don't change any code. |
| 27 | * - SAVE_ALL/RESTORE_ALL - Save/restore all registers |
| 28 | * - SAVE_ARGS/RESTORE_ARGS - Save/restore registers that C functions modify. |
| 29 | * There are unfortunately lots of special cases where some registers |
| 30 | * not touched. The macro is a big mess that should be cleaned up. |
| 31 | * - SAVE_REST/RESTORE_REST - Handle the registers not saved by SAVE_ARGS. |
| 32 | * Gives a full stack frame. |
| 33 | * - ENTRY/END Define functions in the symbol table. |
| 34 | * - FIXUP_TOP_OF_STACK/RESTORE_TOP_OF_STACK - Fix up the hardware stack |
| 35 | * frame that is otherwise undefined after a SYSCALL |
| 36 | * - TRACE_IRQ_* - Trace hard interrupt state for lock debugging. |
| 37 | * - errorentry/paranoidentry/zeroentry - Define exception entry points. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/linkage.h> |
| 41 | #include <asm/segment.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <asm/cache.h> |
| 43 | #include <asm/errno.h> |
| 44 | #include <asm/dwarf2.h> |
| 45 | #include <asm/calling.h> |
Sam Ravnborg | e2d5df9 | 2005-09-09 21:28:48 +0200 | [diff] [blame] | 46 | #include <asm/asm-offsets.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/msr.h> |
| 48 | #include <asm/unistd.h> |
| 49 | #include <asm/thread_info.h> |
| 50 | #include <asm/hw_irq.h> |
Andi Kleen | 5f8efbb | 2006-01-16 01:56:39 +0100 | [diff] [blame] | 51 | #include <asm/page.h> |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 52 | #include <asm/irqflags.h> |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 53 | #include <asm/paravirt.h> |
Abhishek Sagar | 395a59d | 2008-06-21 23:47:27 +0530 | [diff] [blame] | 54 | #include <asm/ftrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Roland McGrath | 86a1c34 | 2008-06-23 15:37:04 -0700 | [diff] [blame] | 56 | /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
| 57 | #include <linux/elf-em.h> |
| 58 | #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) |
| 59 | #define __AUDIT_ARCH_64BIT 0x80000000 |
| 60 | #define __AUDIT_ARCH_LE 0x40000000 |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | .code64 |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 63 | /* |
| 64 | * Some macro's to hide the most frequently occuring CFI annotations. |
| 65 | */ |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 66 | .macro pushq_cfi reg |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 67 | pushq \reg |
| 68 | CFI_ADJUST_CFA_OFFSET 8 |
| 69 | .endm |
| 70 | |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 71 | .macro popq_cfi reg |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 72 | popq \reg |
| 73 | CFI_ADJUST_CFA_OFFSET -8 |
| 74 | .endm |
| 75 | |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 76 | .macro movq_cfi reg offset=0 |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 77 | movq %\reg, \offset(%rsp) |
| 78 | CFI_REL_OFFSET \reg, \offset |
| 79 | .endm |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 81 | .macro movq_cfi_restore offset reg |
| 82 | movq \offset(%rsp), %\reg |
| 83 | CFI_RESTORE \reg |
| 84 | .endm |
| 85 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 86 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 87 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 88 | ENTRY(mcount) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 89 | retq |
| 90 | END(mcount) |
| 91 | |
| 92 | ENTRY(ftrace_caller) |
| 93 | |
| 94 | /* taken from glibc */ |
| 95 | subq $0x38, %rsp |
| 96 | movq %rax, (%rsp) |
| 97 | movq %rcx, 8(%rsp) |
| 98 | movq %rdx, 16(%rsp) |
| 99 | movq %rsi, 24(%rsp) |
| 100 | movq %rdi, 32(%rsp) |
| 101 | movq %r8, 40(%rsp) |
| 102 | movq %r9, 48(%rsp) |
| 103 | |
| 104 | movq 0x38(%rsp), %rdi |
| 105 | movq 8(%rbp), %rsi |
Abhishek Sagar | 395a59d | 2008-06-21 23:47:27 +0530 | [diff] [blame] | 106 | subq $MCOUNT_INSN_SIZE, %rdi |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 107 | |
| 108 | .globl ftrace_call |
| 109 | ftrace_call: |
| 110 | call ftrace_stub |
| 111 | |
| 112 | movq 48(%rsp), %r9 |
| 113 | movq 40(%rsp), %r8 |
| 114 | movq 32(%rsp), %rdi |
| 115 | movq 24(%rsp), %rsi |
| 116 | movq 16(%rsp), %rdx |
| 117 | movq 8(%rsp), %rcx |
| 118 | movq (%rsp), %rax |
| 119 | addq $0x38, %rsp |
| 120 | |
| 121 | .globl ftrace_stub |
| 122 | ftrace_stub: |
| 123 | retq |
| 124 | END(ftrace_caller) |
| 125 | |
| 126 | #else /* ! CONFIG_DYNAMIC_FTRACE */ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 127 | ENTRY(mcount) |
| 128 | cmpq $ftrace_stub, ftrace_trace_function |
| 129 | jnz trace |
| 130 | .globl ftrace_stub |
| 131 | ftrace_stub: |
| 132 | retq |
| 133 | |
| 134 | trace: |
| 135 | /* taken from glibc */ |
| 136 | subq $0x38, %rsp |
| 137 | movq %rax, (%rsp) |
| 138 | movq %rcx, 8(%rsp) |
| 139 | movq %rdx, 16(%rsp) |
| 140 | movq %rsi, 24(%rsp) |
| 141 | movq %rdi, 32(%rsp) |
| 142 | movq %r8, 40(%rsp) |
| 143 | movq %r9, 48(%rsp) |
| 144 | |
| 145 | movq 0x38(%rsp), %rdi |
| 146 | movq 8(%rbp), %rsi |
Abhishek Sagar | 395a59d | 2008-06-21 23:47:27 +0530 | [diff] [blame] | 147 | subq $MCOUNT_INSN_SIZE, %rdi |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 148 | |
| 149 | call *ftrace_trace_function |
| 150 | |
| 151 | movq 48(%rsp), %r9 |
| 152 | movq 40(%rsp), %r8 |
| 153 | movq 32(%rsp), %rdi |
| 154 | movq 24(%rsp), %rsi |
| 155 | movq 16(%rsp), %rdx |
| 156 | movq 8(%rsp), %rcx |
| 157 | movq (%rsp), %rax |
| 158 | addq $0x38, %rsp |
| 159 | |
| 160 | jmp ftrace_stub |
| 161 | END(mcount) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 162 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 163 | #endif /* CONFIG_FUNCTION_TRACER */ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 164 | |
Andi Kleen | dc37db4 | 2005-04-16 15:25:05 -0700 | [diff] [blame] | 165 | #ifndef CONFIG_PREEMPT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | #define retint_kernel retint_restore_args |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 167 | #endif |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 168 | |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 169 | #ifdef CONFIG_PARAVIRT |
Jeremy Fitzhardinge | 2be2998 | 2008-06-25 00:19:28 -0400 | [diff] [blame] | 170 | ENTRY(native_usergs_sysret64) |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 171 | swapgs |
| 172 | sysretq |
| 173 | #endif /* CONFIG_PARAVIRT */ |
| 174 | |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 175 | |
| 176 | .macro TRACE_IRQS_IRETQ offset=ARGOFFSET |
| 177 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 178 | bt $9,EFLAGS-\offset(%rsp) /* interrupts off? */ |
| 179 | jnc 1f |
| 180 | TRACE_IRQS_ON |
| 181 | 1: |
| 182 | #endif |
| 183 | .endm |
| 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | /* |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 186 | * C code is not supposed to know about undefined top of stack. Every time |
| 187 | * a C function with an pt_regs argument is called from the SYSCALL based |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | * fast path FIXUP_TOP_OF_STACK is needed. |
| 189 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs |
| 190 | * manipulation. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 191 | */ |
| 192 | |
| 193 | /* %rsp:at FRAMEEND */ |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 194 | .macro FIXUP_TOP_OF_STACK tmp offset=0 |
| 195 | movq %gs:pda_oldrsp,\tmp |
| 196 | movq \tmp,RSP+\offset(%rsp) |
| 197 | movq $__USER_DS,SS+\offset(%rsp) |
| 198 | movq $__USER_CS,CS+\offset(%rsp) |
| 199 | movq $-1,RCX+\offset(%rsp) |
| 200 | movq R11+\offset(%rsp),\tmp /* get eflags */ |
| 201 | movq \tmp,EFLAGS+\offset(%rsp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | .endm |
| 203 | |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 204 | .macro RESTORE_TOP_OF_STACK tmp offset=0 |
| 205 | movq RSP+\offset(%rsp),\tmp |
| 206 | movq \tmp,%gs:pda_oldrsp |
| 207 | movq EFLAGS+\offset(%rsp),\tmp |
| 208 | movq \tmp,R11+\offset(%rsp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | .endm |
| 210 | |
| 211 | .macro FAKE_STACK_FRAME child_rip |
| 212 | /* push in order ss, rsp, eflags, cs, rip */ |
Andi Kleen | 3829ee6 | 2005-07-28 21:15:48 -0700 | [diff] [blame] | 213 | xorl %eax, %eax |
Jeremy Fitzhardinge | e04e0a6 | 2008-06-25 00:19:25 -0400 | [diff] [blame] | 214 | pushq $__KERNEL_DS /* ss */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | CFI_ADJUST_CFA_OFFSET 8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 216 | /*CFI_REL_OFFSET ss,0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | pushq %rax /* rsp */ |
| 218 | CFI_ADJUST_CFA_OFFSET 8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 219 | CFI_REL_OFFSET rsp,0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | pushq $(1<<9) /* eflags - interrupts on */ |
| 221 | CFI_ADJUST_CFA_OFFSET 8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 222 | /*CFI_REL_OFFSET rflags,0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | pushq $__KERNEL_CS /* cs */ |
| 224 | CFI_ADJUST_CFA_OFFSET 8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 225 | /*CFI_REL_OFFSET cs,0*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | pushq \child_rip /* rip */ |
| 227 | CFI_ADJUST_CFA_OFFSET 8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 228 | CFI_REL_OFFSET rip,0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | pushq %rax /* orig rax */ |
| 230 | CFI_ADJUST_CFA_OFFSET 8 |
| 231 | .endm |
| 232 | |
| 233 | .macro UNFAKE_STACK_FRAME |
| 234 | addq $8*6, %rsp |
| 235 | CFI_ADJUST_CFA_OFFSET -(6*8) |
| 236 | .endm |
| 237 | |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 238 | /* |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 239 | * initial frame state for interrupts (and exceptions without error code) |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 240 | */ |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 241 | .macro EMPTY_FRAME start=1 offset=0 |
| 242 | .if \start |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 243 | CFI_STARTPROC simple |
| 244 | CFI_SIGNAL_FRAME |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 245 | CFI_DEF_CFA rsp,8+\offset |
| 246 | .else |
| 247 | CFI_DEF_CFA_OFFSET 8+\offset |
| 248 | .endif |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 249 | .endm |
| 250 | |
| 251 | /* |
| 252 | * initial frame state for interrupts (and exceptions without error code) |
| 253 | */ |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 254 | .macro INTR_FRAME start=1 offset=0 |
Ingo Molnar | e8a0e27 | 2008-11-21 15:11:32 +0100 | [diff] [blame] | 255 | EMPTY_FRAME \start, SS+8+\offset-RIP |
| 256 | /*CFI_REL_OFFSET ss, SS+\offset-RIP*/ |
| 257 | CFI_REL_OFFSET rsp, RSP+\offset-RIP |
| 258 | /*CFI_REL_OFFSET rflags, EFLAGS+\offset-RIP*/ |
| 259 | /*CFI_REL_OFFSET cs, CS+\offset-RIP*/ |
| 260 | CFI_REL_OFFSET rip, RIP+\offset-RIP |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 261 | .endm |
| 262 | |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 263 | /* |
| 264 | * initial frame state for exceptions with error code (and interrupts |
| 265 | * with vector already pushed) |
| 266 | */ |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 267 | .macro XCPT_FRAME start=1 offset=0 |
Ingo Molnar | e8a0e27 | 2008-11-21 15:11:32 +0100 | [diff] [blame] | 268 | INTR_FRAME \start, RIP+\offset-ORIG_RAX |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 269 | /*CFI_REL_OFFSET orig_rax, ORIG_RAX-ORIG_RAX*/ |
| 270 | .endm |
| 271 | |
| 272 | /* |
| 273 | * frame that enables calling into C. |
| 274 | */ |
| 275 | .macro PARTIAL_FRAME start=1 offset=0 |
Ingo Molnar | e8a0e27 | 2008-11-21 15:11:32 +0100 | [diff] [blame] | 276 | XCPT_FRAME \start, ORIG_RAX+\offset-ARGOFFSET |
| 277 | CFI_REL_OFFSET rdi, RDI+\offset-ARGOFFSET |
| 278 | CFI_REL_OFFSET rsi, RSI+\offset-ARGOFFSET |
| 279 | CFI_REL_OFFSET rdx, RDX+\offset-ARGOFFSET |
| 280 | CFI_REL_OFFSET rcx, RCX+\offset-ARGOFFSET |
| 281 | CFI_REL_OFFSET rax, RAX+\offset-ARGOFFSET |
| 282 | CFI_REL_OFFSET r8, R8+\offset-ARGOFFSET |
| 283 | CFI_REL_OFFSET r9, R9+\offset-ARGOFFSET |
| 284 | CFI_REL_OFFSET r10, R10+\offset-ARGOFFSET |
| 285 | CFI_REL_OFFSET r11, R11+\offset-ARGOFFSET |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 286 | .endm |
| 287 | |
| 288 | /* |
| 289 | * frame that enables passing a complete pt_regs to a C function. |
| 290 | */ |
| 291 | .macro DEFAULT_FRAME start=1 offset=0 |
Ingo Molnar | e8a0e27 | 2008-11-21 15:11:32 +0100 | [diff] [blame] | 292 | PARTIAL_FRAME \start, R11+\offset-R15 |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 293 | CFI_REL_OFFSET rbx, RBX+\offset |
| 294 | CFI_REL_OFFSET rbp, RBP+\offset |
| 295 | CFI_REL_OFFSET r12, R12+\offset |
| 296 | CFI_REL_OFFSET r13, R13+\offset |
| 297 | CFI_REL_OFFSET r14, R14+\offset |
| 298 | CFI_REL_OFFSET r15, R15+\offset |
| 299 | .endm |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 300 | |
| 301 | /* save partial stack frame */ |
| 302 | ENTRY(save_args) |
| 303 | XCPT_FRAME |
| 304 | cld |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 305 | movq_cfi rdi, RDI+16-ARGOFFSET |
| 306 | movq_cfi rsi, RSI+16-ARGOFFSET |
| 307 | movq_cfi rdx, RDX+16-ARGOFFSET |
| 308 | movq_cfi rcx, RCX+16-ARGOFFSET |
| 309 | movq_cfi rax, RAX+16-ARGOFFSET |
| 310 | movq_cfi r8, R8+16-ARGOFFSET |
| 311 | movq_cfi r9, R9+16-ARGOFFSET |
| 312 | movq_cfi r10, R10+16-ARGOFFSET |
| 313 | movq_cfi r11, R11+16-ARGOFFSET |
| 314 | |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 315 | leaq -ARGOFFSET+16(%rsp),%rdi /* arg1 for handler */ |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 316 | movq_cfi rbp, 8 /* push %rbp */ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 317 | leaq 8(%rsp), %rbp /* mov %rsp, %ebp */ |
| 318 | testl $3, CS(%rdi) |
| 319 | je 1f |
| 320 | SWAPGS |
| 321 | /* |
| 322 | * irqcount is used to check if a CPU is already on an interrupt stack |
| 323 | * or not. While this is essentially redundant with preempt_count it is |
| 324 | * a little cheaper to use a separate counter in the PDA (short of |
| 325 | * moving irq_enter into assembly, which would be too much work) |
| 326 | */ |
| 327 | 1: incl %gs:pda_irqcount |
| 328 | jne 2f |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 329 | popq_cfi %rax /* move return address... */ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 330 | mov %gs:pda_irqstackptr,%rsp |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 331 | EMPTY_FRAME 0 |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 332 | pushq_cfi %rax /* ... to the new stack */ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 333 | /* |
| 334 | * We entered an interrupt context - irqs are off: |
| 335 | */ |
| 336 | 2: TRACE_IRQS_OFF |
| 337 | ret |
| 338 | CFI_ENDPROC |
| 339 | END(save_args) |
| 340 | |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 341 | ENTRY(save_rest) |
| 342 | PARTIAL_FRAME 1 REST_SKIP+8 |
| 343 | movq 5*8+16(%rsp), %r11 /* save return address */ |
| 344 | movq_cfi rbx, RBX+16 |
| 345 | movq_cfi rbp, RBP+16 |
| 346 | movq_cfi r12, R12+16 |
| 347 | movq_cfi r13, R13+16 |
| 348 | movq_cfi r14, R14+16 |
| 349 | movq_cfi r15, R15+16 |
| 350 | movq %r11, 8(%rsp) /* return address */ |
| 351 | FIXUP_TOP_OF_STACK %r11, 16 |
| 352 | ret |
| 353 | CFI_ENDPROC |
| 354 | END(save_rest) |
| 355 | |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 356 | /* save complete stack frame */ |
| 357 | ENTRY(save_paranoid) |
| 358 | XCPT_FRAME 1 RDI+8 |
| 359 | cld |
| 360 | movq_cfi rdi, RDI+8 |
| 361 | movq_cfi rsi, RSI+8 |
| 362 | movq_cfi rdx, RDX+8 |
| 363 | movq_cfi rcx, RCX+8 |
| 364 | movq_cfi rax, RAX+8 |
| 365 | movq_cfi r8, R8+8 |
| 366 | movq_cfi r9, R9+8 |
| 367 | movq_cfi r10, R10+8 |
| 368 | movq_cfi r11, R11+8 |
| 369 | movq_cfi rbx, RBX+8 |
| 370 | movq_cfi rbp, RBP+8 |
| 371 | movq_cfi r12, R12+8 |
| 372 | movq_cfi r13, R13+8 |
| 373 | movq_cfi r14, R14+8 |
| 374 | movq_cfi r15, R15+8 |
| 375 | movl $1,%ebx |
| 376 | movl $MSR_GS_BASE,%ecx |
| 377 | rdmsr |
| 378 | testl %edx,%edx |
| 379 | js 1f /* negative -> in kernel */ |
| 380 | SWAPGS |
| 381 | xorl %ebx,%ebx |
| 382 | 1: ret |
| 383 | CFI_ENDPROC |
| 384 | END(save_paranoid) |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | /* |
| 387 | * A newly forked process directly context switches into this. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 388 | */ |
| 389 | /* rdi: prev */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | ENTRY(ret_from_fork) |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 391 | DEFAULT_FRAME |
Andi Kleen | 658fdbe | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 392 | push kernel_eflags(%rip) |
Alexander van Heukelum | e0a5a5d | 2008-07-22 18:14:16 +0200 | [diff] [blame] | 393 | CFI_ADJUST_CFA_OFFSET 8 |
Andi Kleen | 658fdbe | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 394 | popf # reset kernel eflags |
Alexander van Heukelum | e0a5a5d | 2008-07-22 18:14:16 +0200 | [diff] [blame] | 395 | CFI_ADJUST_CFA_OFFSET -8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | call schedule_tail |
| 397 | GET_THREAD_INFO(%rcx) |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 398 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | jnz rff_trace |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 400 | rff_action: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | RESTORE_REST |
| 402 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? |
| 403 | je int_ret_from_sys_call |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 404 | testl $_TIF_IA32,TI_flags(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | jnz int_ret_from_sys_call |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 406 | RESTORE_TOP_OF_STACK %rdi, -ARGOFFSET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | jmp ret_from_sys_call |
| 408 | rff_trace: |
| 409 | movq %rsp,%rdi |
| 410 | call syscall_trace_leave |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 411 | GET_THREAD_INFO(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | jmp rff_action |
| 413 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 414 | END(ret_from_fork) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | /* |
| 417 | * System call entry. Upto 6 arguments in registers are supported. |
| 418 | * |
| 419 | * SYSCALL does not save anything on the stack and does not change the |
| 420 | * stack pointer. |
| 421 | */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /* |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 424 | * Register setup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | * rax system call number |
| 426 | * rdi arg0 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 427 | * rcx return address for syscall/sysret, C arg3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | * rsi arg1 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 429 | * rdx arg2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | * r10 arg3 (--> moved to rcx for C) |
| 431 | * r8 arg4 |
| 432 | * r9 arg5 |
| 433 | * r11 eflags for syscall/sysret, temporary for C |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 434 | * r12-r15,rbp,rbx saved by C code, not touched. |
| 435 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | * Interrupts are off on entry. |
| 437 | * Only called from user space. |
| 438 | * |
| 439 | * XXX if we had a free scratch register we could save the RSP into the stack frame |
| 440 | * and report it properly in ps. Unfortunately we haven't. |
Andi Kleen | 7bf36bb | 2006-04-07 19:50:00 +0200 | [diff] [blame] | 441 | * |
| 442 | * When user can change the frames always force IRET. That is because |
| 443 | * it deals with uncanonical addresses better. SYSRET has trouble |
| 444 | * with them due to bugs in both AMD and Intel CPUs. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 445 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | ENTRY(system_call) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 448 | CFI_STARTPROC simple |
Jan Beulich | adf1423 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 449 | CFI_SIGNAL_FRAME |
Jan Beulich | dffead4 | 2006-06-26 13:57:38 +0200 | [diff] [blame] | 450 | CFI_DEF_CFA rsp,PDA_STACKOFFSET |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 451 | CFI_REGISTER rip,rcx |
| 452 | /*CFI_REGISTER rflags,r11*/ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 453 | SWAPGS_UNSAFE_STACK |
| 454 | /* |
| 455 | * A hypervisor implementation might want to use a label |
| 456 | * after the swapgs, so that it can do the swapgs |
| 457 | * for the guest and jump here on syscall. |
| 458 | */ |
| 459 | ENTRY(system_call_after_swapgs) |
| 460 | |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 461 | movq %rsp,%gs:pda_oldrsp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | movq %gs:pda_kernelstack,%rsp |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 463 | /* |
| 464 | * No need to follow this irqs off/on section - it's straight |
| 465 | * and short: |
| 466 | */ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 467 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | SAVE_ARGS 8,1 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 469 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 470 | movq %rcx,RIP-ARGOFFSET(%rsp) |
| 471 | CFI_REL_OFFSET rip,RIP-ARGOFFSET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | GET_THREAD_INFO(%rcx) |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 473 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | jnz tracesys |
Roland McGrath | 86a1c34 | 2008-06-23 15:37:04 -0700 | [diff] [blame] | 475 | system_call_fastpath: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | cmpq $__NR_syscall_max,%rax |
| 477 | ja badsys |
| 478 | movq %r10,%rcx |
| 479 | call *sys_call_table(,%rax,8) # XXX: rip relative |
| 480 | movq %rax,RAX-ARGOFFSET(%rsp) |
| 481 | /* |
| 482 | * Syscall return path ending with SYSRET (fast path) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 483 | * Has incomplete stack frame and undefined top of stack. |
| 484 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | ret_from_sys_call: |
Andi Kleen | 11b854b | 2005-04-16 15:25:02 -0700 | [diff] [blame] | 486 | movl $_TIF_ALLWORK_MASK,%edi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | /* edi: flagmask */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 488 | sysret_check: |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 489 | LOCKDEP_SYS_EXIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | GET_THREAD_INFO(%rcx) |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 491 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 492 | TRACE_IRQS_OFF |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 493 | movl TI_flags(%rcx),%edx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | andl %edi,%edx |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 495 | jnz sysret_careful |
Jan Beulich | bcddc01 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 496 | CFI_REMEMBER_STATE |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 497 | /* |
| 498 | * sysretq will re-enable interrupts: |
| 499 | */ |
| 500 | TRACE_IRQS_ON |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | movq RIP-ARGOFFSET(%rsp),%rcx |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 502 | CFI_REGISTER rip,rcx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | RESTORE_ARGS 0,-ARG_SKIP,1 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 504 | /*CFI_REGISTER rflags,r11*/ |
Jeremy Fitzhardinge | c7245da | 2008-06-25 00:19:27 -0400 | [diff] [blame] | 505 | movq %gs:pda_oldrsp, %rsp |
Jeremy Fitzhardinge | 2be2998 | 2008-06-25 00:19:28 -0400 | [diff] [blame] | 506 | USERGS_SYSRET64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Jan Beulich | bcddc01 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 508 | CFI_RESTORE_STATE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* Handle reschedules */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 510 | /* edx: work, edi: workmask */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | sysret_careful: |
| 512 | bt $TIF_NEED_RESCHED,%edx |
| 513 | jnc sysret_signal |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 514 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 515 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | pushq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 517 | CFI_ADJUST_CFA_OFFSET 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | call schedule |
| 519 | popq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 520 | CFI_ADJUST_CFA_OFFSET -8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | jmp sysret_check |
| 522 | |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 523 | /* Handle a signal */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | sysret_signal: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 525 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 526 | ENABLE_INTERRUPTS(CLBR_NONE) |
Roland McGrath | 86a1c34 | 2008-06-23 15:37:04 -0700 | [diff] [blame] | 527 | #ifdef CONFIG_AUDITSYSCALL |
| 528 | bt $TIF_SYSCALL_AUDIT,%edx |
| 529 | jc sysret_audit |
| 530 | #endif |
Andi Kleen | 10ffdbb | 2005-05-16 21:53:19 -0700 | [diff] [blame] | 531 | /* edx: work flags (arg3) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | leaq do_notify_resume(%rip),%rax |
| 533 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 |
| 534 | xorl %esi,%esi # oldset -> arg2 |
| 535 | call ptregscall_common |
Roland McGrath | 15e8f34 | 2008-06-23 20:41:12 -0700 | [diff] [blame] | 536 | movl $_TIF_WORK_MASK,%edi |
Andi Kleen | 7bf36bb | 2006-04-07 19:50:00 +0200 | [diff] [blame] | 537 | /* Use IRET because user could have changed frame. This |
| 538 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 539 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 540 | TRACE_IRQS_OFF |
Andi Kleen | 7bf36bb | 2006-04-07 19:50:00 +0200 | [diff] [blame] | 541 | jmp int_with_check |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 542 | |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 543 | badsys: |
| 544 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) |
| 545 | jmp ret_from_sys_call |
| 546 | |
Roland McGrath | 86a1c34 | 2008-06-23 15:37:04 -0700 | [diff] [blame] | 547 | #ifdef CONFIG_AUDITSYSCALL |
| 548 | /* |
| 549 | * Fast path for syscall audit without full syscall trace. |
| 550 | * We just call audit_syscall_entry() directly, and then |
| 551 | * jump back to the normal fast path. |
| 552 | */ |
| 553 | auditsys: |
| 554 | movq %r10,%r9 /* 6th arg: 4th syscall arg */ |
| 555 | movq %rdx,%r8 /* 5th arg: 3rd syscall arg */ |
| 556 | movq %rsi,%rcx /* 4th arg: 2nd syscall arg */ |
| 557 | movq %rdi,%rdx /* 3rd arg: 1st syscall arg */ |
| 558 | movq %rax,%rsi /* 2nd arg: syscall number */ |
| 559 | movl $AUDIT_ARCH_X86_64,%edi /* 1st arg: audit arch */ |
| 560 | call audit_syscall_entry |
| 561 | LOAD_ARGS 0 /* reload call-clobbered registers */ |
| 562 | jmp system_call_fastpath |
| 563 | |
| 564 | /* |
| 565 | * Return fast path for syscall audit. Call audit_syscall_exit() |
| 566 | * directly and then jump back to the fast path with TIF_SYSCALL_AUDIT |
| 567 | * masked off. |
| 568 | */ |
| 569 | sysret_audit: |
| 570 | movq %rax,%rsi /* second arg, syscall return value */ |
| 571 | cmpq $0,%rax /* is it < 0? */ |
| 572 | setl %al /* 1 if so, 0 if not */ |
| 573 | movzbl %al,%edi /* zero-extend that into %edi */ |
| 574 | inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ |
| 575 | call audit_syscall_exit |
| 576 | movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi |
| 577 | jmp sysret_check |
| 578 | #endif /* CONFIG_AUDITSYSCALL */ |
| 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | /* Do syscall tracing */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 581 | tracesys: |
Roland McGrath | 86a1c34 | 2008-06-23 15:37:04 -0700 | [diff] [blame] | 582 | #ifdef CONFIG_AUDITSYSCALL |
| 583 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx) |
| 584 | jz auditsys |
| 585 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | SAVE_REST |
Roland McGrath | a31f8dd | 2008-03-16 21:59:11 -0700 | [diff] [blame] | 587 | movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | FIXUP_TOP_OF_STACK %rdi |
| 589 | movq %rsp,%rdi |
| 590 | call syscall_trace_enter |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 591 | /* |
| 592 | * Reload arg registers from stack in case ptrace changed them. |
| 593 | * We don't reload %rax because syscall_trace_enter() returned |
| 594 | * the value it wants us to use in the table lookup. |
| 595 | */ |
| 596 | LOAD_ARGS ARGOFFSET, 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | RESTORE_REST |
| 598 | cmpq $__NR_syscall_max,%rax |
Roland McGrath | a31f8dd | 2008-03-16 21:59:11 -0700 | [diff] [blame] | 599 | ja int_ret_from_sys_call /* RAX(%rsp) set to -ENOSYS above */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | movq %r10,%rcx /* fixup for C */ |
| 601 | call *sys_call_table(,%rax,8) |
Roland McGrath | a31f8dd | 2008-03-16 21:59:11 -0700 | [diff] [blame] | 602 | movq %rax,RAX-ARGOFFSET(%rsp) |
Andi Kleen | 7bf36bb | 2006-04-07 19:50:00 +0200 | [diff] [blame] | 603 | /* Use IRET because user could have changed frame */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 604 | |
| 605 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | * Syscall return path ending with IRET. |
| 607 | * Has correct top of stack, but partial stack frame. |
Jan Beulich | bcddc01 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 608 | */ |
| 609 | .globl int_ret_from_sys_call |
Roland McGrath | 5cbf156 | 2008-06-24 01:13:31 -0700 | [diff] [blame] | 610 | .globl int_with_check |
Jan Beulich | bcddc01 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 611 | int_ret_from_sys_call: |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 612 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 613 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | testl $3,CS-ARGOFFSET(%rsp) |
| 615 | je retint_restore_args |
| 616 | movl $_TIF_ALLWORK_MASK,%edi |
| 617 | /* edi: mask to check */ |
| 618 | int_with_check: |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 619 | LOCKDEP_SYS_EXIT_IRQ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | GET_THREAD_INFO(%rcx) |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 621 | movl TI_flags(%rcx),%edx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | andl %edi,%edx |
| 623 | jnz int_careful |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 624 | andl $~TS_COMPAT,TI_status(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | jmp retint_swapgs |
| 626 | |
| 627 | /* Either reschedule or signal or syscall exit tracking needed. */ |
| 628 | /* First do a reschedule test. */ |
| 629 | /* edx: work, edi: workmask */ |
| 630 | int_careful: |
| 631 | bt $TIF_NEED_RESCHED,%edx |
| 632 | jnc int_very_careful |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 633 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 634 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | pushq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 636 | CFI_ADJUST_CFA_OFFSET 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | call schedule |
| 638 | popq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 639 | CFI_ADJUST_CFA_OFFSET -8 |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 640 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 641 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | jmp int_with_check |
| 643 | |
| 644 | /* handle signals and tracing -- both require a full stack frame */ |
| 645 | int_very_careful: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 646 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 647 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | SAVE_REST |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 649 | /* Check for syscall exit trace */ |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 650 | testl $_TIF_WORK_SYSCALL_EXIT,%edx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | jz int_signal |
| 652 | pushq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 653 | CFI_ADJUST_CFA_OFFSET 8 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 654 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | call syscall_trace_leave |
| 656 | popq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 657 | CFI_ADJUST_CFA_OFFSET -8 |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 658 | andl $~(_TIF_WORK_SYSCALL_EXIT|_TIF_SYSCALL_EMU),%edi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | jmp int_restore_rest |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | int_signal: |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 662 | testl $_TIF_DO_NOTIFY_MASK,%edx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | jz 1f |
| 664 | movq %rsp,%rdi # &ptregs -> arg1 |
| 665 | xorl %esi,%esi # oldset -> arg2 |
| 666 | call do_notify_resume |
Roland McGrath | eca91e7 | 2008-07-10 14:50:39 -0700 | [diff] [blame] | 667 | 1: movl $_TIF_WORK_MASK,%edi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | int_restore_rest: |
| 669 | RESTORE_REST |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 670 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 671 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | jmp int_with_check |
| 673 | CFI_ENDPROC |
Jan Beulich | bcddc01 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 674 | END(system_call) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 675 | |
| 676 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | * Certain special system calls that need to save a complete full stack frame. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 678 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | .macro PTREGSCALL label,func,arg |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 680 | ENTRY(\label) |
| 681 | PARTIAL_FRAME 1 8 /* offset 8: return address */ |
| 682 | subq $REST_SKIP, %rsp |
| 683 | CFI_ADJUST_CFA_OFFSET REST_SKIP |
| 684 | call save_rest |
| 685 | DEFAULT_FRAME 0 8 /* offset 8: return address */ |
| 686 | leaq 8(%rsp), \arg /* pt_regs pointer */ |
| 687 | call \func |
| 688 | jmp ptregscall_common |
| 689 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 690 | END(\label) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | .endm |
| 692 | |
| 693 | PTREGSCALL stub_clone, sys_clone, %r8 |
| 694 | PTREGSCALL stub_fork, sys_fork, %rdi |
| 695 | PTREGSCALL stub_vfork, sys_vfork, %rdi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx |
| 697 | PTREGSCALL stub_iopl, sys_iopl, %rsi |
| 698 | |
| 699 | ENTRY(ptregscall_common) |
Alexander van Heukelum | c002a1e | 2008-11-21 16:41:55 +0100 | [diff] [blame] | 700 | DEFAULT_FRAME 1 8 /* offset 8: return address */ |
| 701 | RESTORE_TOP_OF_STACK %r11, 8 |
| 702 | movq_cfi_restore R15+8, r15 |
| 703 | movq_cfi_restore R14+8, r14 |
| 704 | movq_cfi_restore R13+8, r13 |
| 705 | movq_cfi_restore R12+8, r12 |
| 706 | movq_cfi_restore RBP+8, rbp |
| 707 | movq_cfi_restore RBX+8, rbx |
| 708 | ret $REST_SKIP /* pop extended registers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 710 | END(ptregscall_common) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | ENTRY(stub_execve) |
| 713 | CFI_STARTPROC |
| 714 | popq %r11 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 715 | CFI_ADJUST_CFA_OFFSET -8 |
| 716 | CFI_REGISTER rip, r11 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | SAVE_REST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | FIXUP_TOP_OF_STACK %r11 |
Ingo Molnar | 5d119b2 | 2008-02-26 12:55:57 +0100 | [diff] [blame] | 719 | movq %rsp, %rcx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | call sys_execve |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | RESTORE_TOP_OF_STACK %r11 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | movq %rax,RAX(%rsp) |
| 723 | RESTORE_REST |
| 724 | jmp int_ret_from_sys_call |
| 725 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 726 | END(stub_execve) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | /* |
| 729 | * sigreturn is special because it needs to restore all registers on return. |
| 730 | * This cannot be done with SYSRET, so use the IRET return path instead. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 731 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | ENTRY(stub_rt_sigreturn) |
| 733 | CFI_STARTPROC |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 734 | addq $8, %rsp |
| 735 | CFI_ADJUST_CFA_OFFSET -8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | SAVE_REST |
| 737 | movq %rsp,%rdi |
| 738 | FIXUP_TOP_OF_STACK %r11 |
| 739 | call sys_rt_sigreturn |
| 740 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer |
| 741 | RESTORE_REST |
| 742 | jmp int_ret_from_sys_call |
| 743 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 744 | END(stub_rt_sigreturn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 746 | /* |
H. Peter Anvin | 939b787 | 2008-11-11 13:51:52 -0800 | [diff] [blame] | 747 | * Build the entry stubs and pointer table with some assembler magic. |
| 748 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a |
| 749 | * single cache line on all modern x86 implementations. |
| 750 | */ |
| 751 | .section .init.rodata,"a" |
| 752 | ENTRY(interrupt) |
| 753 | .text |
| 754 | .p2align 5 |
| 755 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
| 756 | ENTRY(irq_entries_start) |
| 757 | INTR_FRAME |
| 758 | vector=FIRST_EXTERNAL_VECTOR |
| 759 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 |
| 760 | .balign 32 |
| 761 | .rept 7 |
| 762 | .if vector < NR_VECTORS |
H. Peter Anvin | 8665596 | 2008-11-12 10:27:35 -0800 | [diff] [blame] | 763 | .if vector <> FIRST_EXTERNAL_VECTOR |
H. Peter Anvin | 939b787 | 2008-11-11 13:51:52 -0800 | [diff] [blame] | 764 | CFI_ADJUST_CFA_OFFSET -8 |
| 765 | .endif |
| 766 | 1: pushq $(~vector+0x80) /* Note: always in signed byte range */ |
| 767 | CFI_ADJUST_CFA_OFFSET 8 |
H. Peter Anvin | 8665596 | 2008-11-12 10:27:35 -0800 | [diff] [blame] | 768 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
H. Peter Anvin | 939b787 | 2008-11-11 13:51:52 -0800 | [diff] [blame] | 769 | jmp 2f |
| 770 | .endif |
| 771 | .previous |
| 772 | .quad 1b |
| 773 | .text |
| 774 | vector=vector+1 |
| 775 | .endif |
| 776 | .endr |
| 777 | 2: jmp common_interrupt |
| 778 | .endr |
| 779 | CFI_ENDPROC |
| 780 | END(irq_entries_start) |
| 781 | |
| 782 | .previous |
| 783 | END(interrupt) |
| 784 | .previous |
| 785 | |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 786 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | * Interrupt entry/exit. |
| 788 | * |
| 789 | * Interrupt entry points save only callee clobbered registers in fast path. |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 790 | * |
| 791 | * Entry runs with interrupts off. |
| 792 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Alexander van Heukelum | 722024d | 2008-11-13 13:50:20 +0100 | [diff] [blame] | 794 | /* 0(%rsp): ~(interrupt number) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | .macro interrupt func |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 796 | subq $10*8, %rsp |
| 797 | CFI_ADJUST_CFA_OFFSET 10*8 |
| 798 | call save_args |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 799 | PARTIAL_FRAME 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | call \func |
| 801 | .endm |
| 802 | |
Alexander van Heukelum | 722024d | 2008-11-13 13:50:20 +0100 | [diff] [blame] | 803 | /* |
| 804 | * The interrupt stubs push (~vector+0x80) onto the stack and |
| 805 | * then jump to common_interrupt. |
| 806 | */ |
H. Peter Anvin | 939b787 | 2008-11-11 13:51:52 -0800 | [diff] [blame] | 807 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
| 808 | common_interrupt: |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 809 | XCPT_FRAME |
Alexander van Heukelum | 722024d | 2008-11-13 13:50:20 +0100 | [diff] [blame] | 810 | addq $-0x80,(%rsp) /* Adjust vector to [-256,-1] range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | interrupt do_IRQ |
| 812 | /* 0(%rsp): oldrsp-ARGOFFSET */ |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 813 | ret_from_intr: |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 814 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 815 | TRACE_IRQS_OFF |
Andi Kleen | 3829ee6 | 2005-07-28 21:15:48 -0700 | [diff] [blame] | 816 | decl %gs:pda_irqcount |
Jan Beulich | 1de9c3f | 2006-06-26 13:57:35 +0200 | [diff] [blame] | 817 | leaveq |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 818 | CFI_DEF_CFA_REGISTER rsp |
Jan Beulich | 1de9c3f | 2006-06-26 13:57:35 +0200 | [diff] [blame] | 819 | CFI_ADJUST_CFA_OFFSET -8 |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 820 | exit_intr: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | GET_THREAD_INFO(%rcx) |
| 822 | testl $3,CS-ARGOFFSET(%rsp) |
| 823 | je retint_kernel |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | /* Interrupt came from user space */ |
| 826 | /* |
| 827 | * Has a correct top of stack, but a partial stack frame |
| 828 | * %rcx: thread info. Interrupts off. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 829 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | retint_with_reschedule: |
| 831 | movl $_TIF_WORK_MASK,%edi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 832 | retint_check: |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 833 | LOCKDEP_SYS_EXIT_IRQ |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 834 | movl TI_flags(%rcx),%edx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | andl %edi,%edx |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 836 | CFI_REMEMBER_STATE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | jnz retint_careful |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 838 | |
| 839 | retint_swapgs: /* return to user-space */ |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 840 | /* |
| 841 | * The iretq could re-enable interrupts: |
| 842 | */ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 843 | DISABLE_INTERRUPTS(CLBR_ANY) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 844 | TRACE_IRQS_IRETQ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 845 | SWAPGS |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 846 | jmp restore_args |
| 847 | |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 848 | retint_restore_args: /* return to kernel space */ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 849 | DISABLE_INTERRUPTS(CLBR_ANY) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 850 | /* |
| 851 | * The iretq could re-enable interrupts: |
| 852 | */ |
| 853 | TRACE_IRQS_IRETQ |
| 854 | restore_args: |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 855 | RESTORE_ARGS 0,8,0 |
| 856 | |
Adrian Bunk | f7f3d79 | 2008-02-13 23:29:53 +0200 | [diff] [blame] | 857 | irq_return: |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 858 | INTERRUPT_RETURN |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 859 | |
| 860 | .section __ex_table, "a" |
| 861 | .quad irq_return, bad_iret |
| 862 | .previous |
| 863 | |
| 864 | #ifdef CONFIG_PARAVIRT |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 865 | ENTRY(native_iret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | iretq |
| 867 | |
| 868 | .section __ex_table,"a" |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 869 | .quad native_iret, bad_iret |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | .previous |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 871 | #endif |
| 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | .section .fixup,"ax" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | bad_iret: |
Roland McGrath | 3aa4b37 | 2008-02-06 22:39:43 +0100 | [diff] [blame] | 875 | /* |
| 876 | * The iret traps when the %cs or %ss being restored is bogus. |
| 877 | * We've lost the original trap vector and error code. |
| 878 | * #GPF is the most likely one to get for an invalid selector. |
| 879 | * So pretend we completed the iret and took the #GPF in user mode. |
| 880 | * |
| 881 | * We are now running with the kernel GS after exception recovery. |
| 882 | * But error_entry expects us to have user GS to match the user %cs, |
| 883 | * so swap back. |
| 884 | */ |
| 885 | pushq $0 |
| 886 | |
| 887 | SWAPGS |
| 888 | jmp general_protection |
| 889 | |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 890 | .previous |
| 891 | |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 892 | /* edi: workmask, edx: work */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | retint_careful: |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 894 | CFI_RESTORE_STATE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | bt $TIF_NEED_RESCHED,%edx |
| 896 | jnc retint_signal |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 897 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 898 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | pushq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 900 | CFI_ADJUST_CFA_OFFSET 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | call schedule |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 902 | popq %rdi |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 903 | CFI_ADJUST_CFA_OFFSET -8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | GET_THREAD_INFO(%rcx) |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 905 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 906 | TRACE_IRQS_OFF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | jmp retint_check |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | retint_signal: |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 910 | testl $_TIF_DO_NOTIFY_MASK,%edx |
Andi Kleen | 10ffdbb | 2005-05-16 21:53:19 -0700 | [diff] [blame] | 911 | jz retint_swapgs |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 912 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 913 | ENABLE_INTERRUPTS(CLBR_NONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | SAVE_REST |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 915 | movq $-1,ORIG_RAX(%rsp) |
Andi Kleen | 3829ee6 | 2005-07-28 21:15:48 -0700 | [diff] [blame] | 916 | xorl %esi,%esi # oldset |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | movq %rsp,%rdi # &pt_regs |
| 918 | call do_notify_resume |
| 919 | RESTORE_REST |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 920 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 921 | TRACE_IRQS_OFF |
Andi Kleen | be9e687 | 2005-05-01 08:58:51 -0700 | [diff] [blame] | 922 | GET_THREAD_INFO(%rcx) |
Roland McGrath | eca91e7 | 2008-07-10 14:50:39 -0700 | [diff] [blame] | 923 | jmp retint_with_reschedule |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | #ifdef CONFIG_PREEMPT |
| 926 | /* Returning to kernel space. Check if we need preemption */ |
| 927 | /* rcx: threadinfo. interrupts off. */ |
Andi Kleen | b06baba | 2006-09-26 10:52:29 +0200 | [diff] [blame] | 928 | ENTRY(retint_kernel) |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 929 | cmpl $0,TI_preempt_count(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | jnz retint_restore_args |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 931 | bt $TIF_NEED_RESCHED,TI_flags(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | jnc retint_restore_args |
| 933 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ |
| 934 | jnc retint_restore_args |
| 935 | call preempt_schedule_irq |
| 936 | jmp exit_intr |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 937 | #endif |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 940 | END(common_interrupt) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | /* |
| 943 | * APIC interrupts. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 944 | */ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 945 | .p2align 5 |
| 946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | .macro apicinterrupt num,func |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 948 | INTR_FRAME |
Rusty Russell | 19eadf9 | 2006-06-27 02:53:44 -0700 | [diff] [blame] | 949 | pushq $~(\num) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 950 | CFI_ADJUST_CFA_OFFSET 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | interrupt \func |
| 952 | jmp ret_from_intr |
| 953 | CFI_ENDPROC |
| 954 | .endm |
| 955 | |
| 956 | ENTRY(thermal_interrupt) |
| 957 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 958 | END(thermal_interrupt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Jacob Shin | 89b831e | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 960 | ENTRY(threshold_interrupt) |
| 961 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 962 | END(threshold_interrupt) |
Jacob Shin | 89b831e | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 963 | |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 964 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | ENTRY(reschedule_interrupt) |
| 966 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 967 | END(reschedule_interrupt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Andi Kleen | e5bc8b6 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 969 | .macro INVALIDATE_ENTRY num |
| 970 | ENTRY(invalidate_interrupt\num) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 971 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 972 | END(invalidate_interrupt\num) |
Andi Kleen | e5bc8b6 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 973 | .endm |
| 974 | |
| 975 | INVALIDATE_ENTRY 0 |
| 976 | INVALIDATE_ENTRY 1 |
| 977 | INVALIDATE_ENTRY 2 |
| 978 | INVALIDATE_ENTRY 3 |
| 979 | INVALIDATE_ENTRY 4 |
| 980 | INVALIDATE_ENTRY 5 |
| 981 | INVALIDATE_ENTRY 6 |
| 982 | INVALIDATE_ENTRY 7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
| 984 | ENTRY(call_function_interrupt) |
| 985 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 986 | END(call_function_interrupt) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 987 | ENTRY(call_function_single_interrupt) |
| 988 | apicinterrupt CALL_FUNCTION_SINGLE_VECTOR,smp_call_function_single_interrupt |
| 989 | END(call_function_single_interrupt) |
Eric W. Biederman | 6101429 | 2007-02-23 04:40:58 -0700 | [diff] [blame] | 990 | ENTRY(irq_move_cleanup_interrupt) |
| 991 | apicinterrupt IRQ_MOVE_CLEANUP_VECTOR,smp_irq_move_cleanup_interrupt |
| 992 | END(irq_move_cleanup_interrupt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | #endif |
| 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | ENTRY(apic_timer_interrupt) |
| 996 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 997 | END(apic_timer_interrupt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
Cliff Wickman | 1812924 | 2008-06-02 08:56:14 -0500 | [diff] [blame] | 999 | ENTRY(uv_bau_message_intr1) |
| 1000 | apicinterrupt 220,uv_bau_message_interrupt |
| 1001 | END(uv_bau_message_intr1) |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | ENTRY(error_interrupt) |
| 1004 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1005 | END(error_interrupt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
| 1007 | ENTRY(spurious_interrupt) |
| 1008 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1009 | END(spurious_interrupt) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | /* |
| 1012 | * Exception entry points. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1013 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | .macro zeroentry sym |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1015 | INTR_FRAME |
Jeremy Fitzhardinge | fab5842 | 2008-06-25 00:19:31 -0400 | [diff] [blame] | 1016 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 1017 | pushq_cfi $-1 /* ORIG_RAX: no syscall to restart */ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1018 | subq $15*8,%rsp |
| 1019 | CFI_ADJUST_CFA_OFFSET 15*8 |
| 1020 | call error_entry |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1021 | DEFAULT_FRAME 0 |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1022 | movq %rsp,%rdi /* pt_regs pointer */ |
| 1023 | xorl %esi,%esi /* no error code */ |
| 1024 | call \sym |
| 1025 | jmp error_exit /* %ebx: no swapgs flag */ |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1026 | CFI_ENDPROC |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1027 | .endm |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1029 | .macro paranoidzeroentry sym |
| 1030 | INTR_FRAME |
| 1031 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
| 1032 | pushq $-1 /* ORIG_RAX: no syscall to restart */ |
| 1033 | CFI_ADJUST_CFA_OFFSET 8 |
| 1034 | subq $15*8, %rsp |
| 1035 | call save_paranoid |
| 1036 | TRACE_IRQS_OFF |
| 1037 | movq %rsp,%rdi /* pt_regs pointer */ |
| 1038 | xorl %esi,%esi /* no error code */ |
| 1039 | call \sym |
| 1040 | jmp paranoid_exit /* %ebx: no swapgs flag */ |
| 1041 | CFI_ENDPROC |
| 1042 | .endm |
| 1043 | |
| 1044 | .macro paranoidzeroentry_ist sym ist |
| 1045 | INTR_FRAME |
| 1046 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
| 1047 | pushq $-1 /* ORIG_RAX: no syscall to restart */ |
| 1048 | CFI_ADJUST_CFA_OFFSET 8 |
| 1049 | subq $15*8, %rsp |
| 1050 | call save_paranoid |
| 1051 | TRACE_IRQS_OFF |
| 1052 | movq %rsp,%rdi /* pt_regs pointer */ |
| 1053 | xorl %esi,%esi /* no error code */ |
| 1054 | movq %gs:pda_data_offset, %rbp |
| 1055 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
| 1056 | call \sym |
| 1057 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
| 1058 | jmp paranoid_exit /* %ebx: no swapgs flag */ |
| 1059 | CFI_ENDPROC |
| 1060 | .endm |
| 1061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | .macro errorentry sym |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1063 | XCPT_FRAME |
Jeremy Fitzhardinge | fab5842 | 2008-06-25 00:19:31 -0400 | [diff] [blame] | 1064 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1065 | subq $15*8,%rsp |
| 1066 | CFI_ADJUST_CFA_OFFSET 15*8 |
| 1067 | call error_entry |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1068 | DEFAULT_FRAME 0 |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1069 | movq %rsp,%rdi /* pt_regs pointer */ |
| 1070 | movq ORIG_RAX(%rsp),%rsi /* get error code */ |
| 1071 | movq $-1,ORIG_RAX(%rsp) /* no syscall to restart */ |
| 1072 | call \sym |
| 1073 | jmp error_exit /* %ebx: no swapgs flag */ |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1074 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | .endm |
| 1076 | |
| 1077 | /* error code is on the stack already */ |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1078 | .macro paranoiderrorentry sym |
| 1079 | XCPT_FRAME |
| 1080 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
| 1081 | subq $15*8,%rsp |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1082 | CFI_ADJUST_CFA_OFFSET 15*8 |
| 1083 | call save_paranoid |
| 1084 | DEFAULT_FRAME 0 |
Alexander van Heukelum | 7e61a79 | 2008-09-26 14:03:03 +0200 | [diff] [blame] | 1085 | TRACE_IRQS_OFF |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1086 | movq %rsp,%rdi /* pt_regs pointer */ |
| 1087 | movq ORIG_RAX(%rsp),%rsi /* get error code */ |
| 1088 | movq $-1,ORIG_RAX(%rsp) /* no syscall to restart */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | call \sym |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1090 | jmp paranoid_exit /* %ebx: no swapgs flag */ |
| 1091 | CFI_ENDPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | .endm |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1093 | |
| 1094 | /* |
| 1095 | * "Paranoid" exit path from exception stack. |
| 1096 | * Paranoid because this is used by NMIs and cannot take |
| 1097 | * any kernel state for granted. |
| 1098 | * We don't do kernel preemption checks here, because only |
| 1099 | * NMI should be common and it does not enable IRQs and |
| 1100 | * cannot get reschedule ticks. |
| 1101 | * |
| 1102 | * "trace" is 0 for the NMI handler only, because irq-tracing |
| 1103 | * is fundamentally NMI-unsafe. (we cannot change the soft and |
| 1104 | * hard flags at once, atomically) |
| 1105 | */ |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1106 | |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1107 | /* ebx: no swapgs flag */ |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1108 | KPROBE_ENTRY(paranoid_exit) |
| 1109 | INTR_FRAME |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1110 | DISABLE_INTERRUPTS(CLBR_NONE) |
| 1111 | TRACE_IRQS_OFF |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1112 | testl %ebx,%ebx /* swapgs needed? */ |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1113 | jnz paranoid_restore |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1114 | testl $3,CS(%rsp) |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1115 | jnz paranoid_userspace |
| 1116 | paranoid_swapgs: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1117 | TRACE_IRQS_IRETQ 0 |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1118 | SWAPGS_UNSAFE_STACK |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1119 | paranoid_restore: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1120 | RESTORE_ALL 8 |
Ingo Molnar | 3701d863 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 1121 | jmp irq_return |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1122 | paranoid_userspace: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1123 | GET_THREAD_INFO(%rcx) |
Glauber Costa | 26ccb8a | 2008-06-24 11:19:35 -0300 | [diff] [blame] | 1124 | movl TI_flags(%rcx),%ebx |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1125 | andl $_TIF_WORK_MASK,%ebx |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1126 | jz paranoid_swapgs |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1127 | movq %rsp,%rdi /* &pt_regs */ |
| 1128 | call sync_regs |
| 1129 | movq %rax,%rsp /* switch stack for scheduling */ |
| 1130 | testl $_TIF_NEED_RESCHED,%ebx |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1131 | jnz paranoid_schedule |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1132 | movl %ebx,%edx /* arg3: thread flags */ |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1133 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1134 | ENABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1135 | xorl %esi,%esi /* arg2: oldset */ |
| 1136 | movq %rsp,%rdi /* arg1: &pt_regs */ |
| 1137 | call do_notify_resume |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1138 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1139 | TRACE_IRQS_OFF |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1140 | jmp paranoid_userspace |
| 1141 | paranoid_schedule: |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1142 | TRACE_IRQS_ON |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1143 | ENABLE_INTERRUPTS(CLBR_ANY) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1144 | call schedule |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1145 | DISABLE_INTERRUPTS(CLBR_ANY) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1146 | TRACE_IRQS_OFF |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1147 | jmp paranoid_userspace |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1148 | CFI_ENDPROC |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1149 | END(paranoid_exit) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | /* |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1152 | * Exception entry point. This expects an error code/orig_rax on the stack. |
| 1153 | * returns in "no swapgs flag" in %ebx. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1154 | */ |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1155 | KPROBE_ENTRY(error_entry) |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1156 | XCPT_FRAME |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1157 | CFI_ADJUST_CFA_OFFSET 15*8 |
| 1158 | /* oldrax contains error code */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1159 | cld |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 1160 | movq_cfi rdi, RDI+8 |
| 1161 | movq_cfi rsi, RSI+8 |
| 1162 | movq_cfi rdx, RDX+8 |
| 1163 | movq_cfi rcx, RCX+8 |
| 1164 | movq_cfi rax, RAX+8 |
| 1165 | movq_cfi r8, R8+8 |
| 1166 | movq_cfi r9, R9+8 |
| 1167 | movq_cfi r10, R10+8 |
| 1168 | movq_cfi r11, R11+8 |
| 1169 | movq_cfi rbx, RBX+8 |
| 1170 | movq_cfi rbp, RBP+8 |
| 1171 | movq_cfi r12, R12+8 |
| 1172 | movq_cfi r13, R13+8 |
| 1173 | movq_cfi r14, R14+8 |
| 1174 | movq_cfi r15, R15+8 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1175 | xorl %ebx,%ebx |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1176 | testl $3,CS+8(%rsp) |
| 1177 | je error_kernelspace |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1178 | error_swapgs: |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1179 | SWAPGS |
Alexander van Heukelum | 6b11d4e | 2008-09-26 14:03:02 +0200 | [diff] [blame] | 1180 | error_sti: |
| 1181 | TRACE_IRQS_OFF |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1182 | ret |
| 1183 | CFI_ENDPROC |
| 1184 | |
| 1185 | /* |
| 1186 | * There are two places in the kernel that can potentially fault with |
| 1187 | * usergs. Handle them here. The exception handlers after iret run with |
| 1188 | * kernel gs again, so don't set the user space flag. B stepping K8s |
| 1189 | * sometimes report an truncated RIP for IRET exceptions returning to |
| 1190 | * compat mode. Check for these here too. |
| 1191 | */ |
| 1192 | error_kernelspace: |
| 1193 | incl %ebx |
| 1194 | leaq irq_return(%rip),%rcx |
| 1195 | cmpq %rcx,RIP+8(%rsp) |
| 1196 | je error_swapgs |
| 1197 | movl %ecx,%ecx /* zero extend */ |
| 1198 | cmpq %rcx,RIP+8(%rsp) |
| 1199 | je error_swapgs |
| 1200 | cmpq $gs_change,RIP+8(%rsp) |
| 1201 | je error_swapgs |
| 1202 | jmp error_sti |
| 1203 | KPROBE_END(error_entry) |
| 1204 | |
| 1205 | |
| 1206 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ |
| 1207 | KPROBE_ENTRY(error_exit) |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1208 | DEFAULT_FRAME |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 1209 | movl %ebx,%eax |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | RESTORE_REST |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1211 | DISABLE_INTERRUPTS(CLBR_NONE) |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1212 | TRACE_IRQS_OFF |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1213 | GET_THREAD_INFO(%rcx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | testl %eax,%eax |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1215 | jne retint_kernel |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 1216 | LOCKDEP_SYS_EXIT_IRQ |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1217 | movl TI_flags(%rcx),%edx |
| 1218 | movl $_TIF_WORK_MASK,%edi |
| 1219 | andl %edi,%edx |
| 1220 | jnz retint_careful |
Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 1221 | jmp retint_swapgs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | CFI_ENDPROC |
Alexander van Heukelum | d99015b | 2008-11-19 01:18:11 +0100 | [diff] [blame] | 1223 | KPROBE_END(error_exit) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | /* Reload gs selector with exception handling */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1226 | /* edi: new selector */ |
Jeremy Fitzhardinge | 9f9d489 | 2008-06-25 00:19:32 -0400 | [diff] [blame] | 1227 | ENTRY(native_load_gs_index) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1228 | CFI_STARTPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | pushf |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1230 | CFI_ADJUST_CFA_OFFSET 8 |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1231 | DISABLE_INTERRUPTS(CLBR_ANY | ~(CLBR_RDI)) |
| 1232 | SWAPGS |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1233 | gs_change: |
| 1234 | movl %edi,%gs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | 2: mfence /* workaround */ |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1236 | SWAPGS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | popf |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1238 | CFI_ADJUST_CFA_OFFSET -8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | ret |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1240 | CFI_ENDPROC |
Jeremy Fitzhardinge | 9f9d489 | 2008-06-25 00:19:32 -0400 | [diff] [blame] | 1241 | ENDPROC(native_load_gs_index) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | .section __ex_table,"a" |
| 1244 | .align 8 |
| 1245 | .quad gs_change,bad_gs |
| 1246 | .previous |
| 1247 | .section .fixup,"ax" |
| 1248 | /* running with kernelgs */ |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1249 | bad_gs: |
Glauber de Oliveira Costa | 72fe485 | 2008-01-30 13:32:08 +0100 | [diff] [blame] | 1250 | SWAPGS /* switch back to user gs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | xorl %eax,%eax |
| 1252 | movl %eax,%gs |
| 1253 | jmp 2b |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1254 | .previous |
| 1255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | /* |
| 1257 | * Create a kernel thread. |
| 1258 | * |
| 1259 | * C extern interface: |
| 1260 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 1261 | * |
| 1262 | * asm input arguments: |
| 1263 | * rdi: fn, rsi: arg, rdx: flags |
| 1264 | */ |
| 1265 | ENTRY(kernel_thread) |
| 1266 | CFI_STARTPROC |
| 1267 | FAKE_STACK_FRAME $child_rip |
| 1268 | SAVE_ALL |
| 1269 | |
| 1270 | # rdi: flags, rsi: usp, rdx: will be &pt_regs |
| 1271 | movq %rdx,%rdi |
| 1272 | orq kernel_thread_flags(%rip),%rdi |
| 1273 | movq $-1, %rsi |
| 1274 | movq %rsp, %rdx |
| 1275 | |
| 1276 | xorl %r8d,%r8d |
| 1277 | xorl %r9d,%r9d |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | # clone now |
| 1280 | call do_fork |
| 1281 | movq %rax,RAX(%rsp) |
| 1282 | xorl %edi,%edi |
| 1283 | |
| 1284 | /* |
| 1285 | * It isn't worth to check for reschedule here, |
| 1286 | * so internally to the x86_64 port you can rely on kernel_thread() |
| 1287 | * not to reschedule the child before returning, this avoids the need |
| 1288 | * of hacks for example to fork off the per-CPU idle tasks. |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1289 | * [Hopefully no generic code relies on the reschedule -AK] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | */ |
| 1291 | RESTORE_ALL |
| 1292 | UNFAKE_STACK_FRAME |
| 1293 | ret |
| 1294 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1295 | ENDPROC(kernel_thread) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | child_rip: |
Andi Kleen | c05991e | 2006-08-30 19:37:08 +0200 | [diff] [blame] | 1298 | pushq $0 # fake return address |
| 1299 | CFI_STARTPROC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | /* |
| 1301 | * Here we are in the child and the registers are set as they were |
| 1302 | * at kernel_thread() invocation in the parent. |
| 1303 | */ |
| 1304 | movq %rdi, %rax |
| 1305 | movq %rsi, %rdi |
| 1306 | call *%rax |
| 1307 | # exit |
Andrey Mirkin | 1c5b5cf | 2007-10-17 18:04:33 +0200 | [diff] [blame] | 1308 | mov %eax, %edi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | call do_exit |
Andi Kleen | c05991e | 2006-08-30 19:37:08 +0200 | [diff] [blame] | 1310 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1311 | ENDPROC(child_rip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
| 1313 | /* |
| 1314 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. |
| 1315 | * |
| 1316 | * C extern interface: |
| 1317 | * extern long execve(char *name, char **argv, char **envp) |
| 1318 | * |
| 1319 | * asm input arguments: |
| 1320 | * rdi: name, rsi: argv, rdx: envp |
| 1321 | * |
| 1322 | * We want to fallback into: |
Ingo Molnar | 5d119b2 | 2008-02-26 12:55:57 +0100 | [diff] [blame] | 1323 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | * |
| 1325 | * do_sys_execve asm fallback arguments: |
Ingo Molnar | 5d119b2 | 2008-02-26 12:55:57 +0100 | [diff] [blame] | 1326 | * rdi: name, rsi: argv, rdx: envp, rcx: fake frame on the stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | */ |
Arnd Bergmann | 3db03b4 | 2006-10-02 02:18:31 -0700 | [diff] [blame] | 1328 | ENTRY(kernel_execve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | CFI_STARTPROC |
| 1330 | FAKE_STACK_FRAME $0 |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1331 | SAVE_ALL |
Ingo Molnar | 5d119b2 | 2008-02-26 12:55:57 +0100 | [diff] [blame] | 1332 | movq %rsp,%rcx |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | call sys_execve |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1334 | movq %rax, RAX(%rsp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | RESTORE_REST |
| 1336 | testq %rax,%rax |
| 1337 | je int_ret_from_sys_call |
| 1338 | RESTORE_ARGS |
| 1339 | UNFAKE_STACK_FRAME |
| 1340 | ret |
| 1341 | CFI_ENDPROC |
Arnd Bergmann | 3db03b4 | 2006-10-02 02:18:31 -0700 | [diff] [blame] | 1342 | ENDPROC(kernel_execve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 1344 | KPROBE_ENTRY(page_fault) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | errorentry do_page_fault |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1346 | KPROBE_END(page_fault) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | |
| 1348 | ENTRY(coprocessor_error) |
| 1349 | zeroentry do_coprocessor_error |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1350 | END(coprocessor_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
| 1352 | ENTRY(simd_coprocessor_error) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1353 | zeroentry do_simd_coprocessor_error |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1354 | END(simd_coprocessor_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | |
| 1356 | ENTRY(device_not_available) |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 1357 | zeroentry do_device_not_available |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1358 | END(device_not_available) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | |
| 1360 | /* runs on exception stack */ |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 1361 | KPROBE_ENTRY(debug) |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1362 | paranoidzeroentry_ist do_debug, DEBUG_STACK |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1363 | KPROBE_END(debug) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1365 | /* runs on exception stack */ |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 1366 | KPROBE_ENTRY(nmi) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1367 | INTR_FRAME |
Jeremy Fitzhardinge | 0940294 | 2008-07-12 02:22:12 -0700 | [diff] [blame] | 1368 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1369 | pushq_cfi $-1 |
| 1370 | subq $15*8, %rsp |
| 1371 | CFI_ADJUST_CFA_OFFSET 15*8 |
| 1372 | call save_paranoid |
| 1373 | DEFAULT_FRAME 0 |
| 1374 | /* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */ |
| 1375 | movq %rsp,%rdi |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1376 | movq $-1,%rsi |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1377 | call do_nmi |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1378 | #ifdef CONFIG_TRACE_IRQFLAGS |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1379 | /* paranoidexit; without TRACE_IRQS_OFF */ |
| 1380 | /* ebx: no swapgs flag */ |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1381 | DISABLE_INTERRUPTS(CLBR_NONE) |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1382 | testl %ebx,%ebx /* swapgs needed? */ |
| 1383 | jnz nmi_restore |
| 1384 | testl $3,CS(%rsp) |
| 1385 | jnz nmi_userspace |
| 1386 | nmi_swapgs: |
| 1387 | SWAPGS_UNSAFE_STACK |
| 1388 | nmi_restore: |
| 1389 | RESTORE_ALL 8 |
| 1390 | jmp irq_return |
| 1391 | nmi_userspace: |
| 1392 | GET_THREAD_INFO(%rcx) |
| 1393 | movl TI_flags(%rcx),%ebx |
| 1394 | andl $_TIF_WORK_MASK,%ebx |
| 1395 | jz nmi_swapgs |
| 1396 | movq %rsp,%rdi /* &pt_regs */ |
| 1397 | call sync_regs |
| 1398 | movq %rax,%rsp /* switch stack for scheduling */ |
| 1399 | testl $_TIF_NEED_RESCHED,%ebx |
| 1400 | jnz nmi_schedule |
| 1401 | movl %ebx,%edx /* arg3: thread flags */ |
| 1402 | ENABLE_INTERRUPTS(CLBR_NONE) |
| 1403 | xorl %esi,%esi /* arg2: oldset */ |
| 1404 | movq %rsp,%rdi /* arg1: &pt_regs */ |
| 1405 | call do_notify_resume |
| 1406 | DISABLE_INTERRUPTS(CLBR_NONE) |
| 1407 | jmp nmi_userspace |
| 1408 | nmi_schedule: |
| 1409 | ENABLE_INTERRUPTS(CLBR_ANY) |
| 1410 | call schedule |
| 1411 | DISABLE_INTERRUPTS(CLBR_ANY) |
| 1412 | jmp nmi_userspace |
| 1413 | CFI_ENDPROC |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1414 | #else |
Alexander van Heukelum | e2f6bc2 | 2008-11-21 16:43:18 +0100 | [diff] [blame] | 1415 | jmp paranoid_exit |
Ingo Molnar | 2601e64 | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 1416 | CFI_ENDPROC |
| 1417 | #endif |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1418 | KPROBE_END(nmi) |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 1419 | |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 1420 | KPROBE_ENTRY(int3) |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1421 | paranoidzeroentry_ist do_int3, DEBUG_STACK |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1422 | KPROBE_END(int3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
| 1424 | ENTRY(overflow) |
| 1425 | zeroentry do_overflow |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1426 | END(overflow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | ENTRY(bounds) |
| 1429 | zeroentry do_bounds |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1430 | END(bounds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
| 1432 | ENTRY(invalid_op) |
Alexander van Heukelum | 0bd7b79 | 2008-11-16 15:29:00 +0100 | [diff] [blame] | 1433 | zeroentry do_invalid_op |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1434 | END(invalid_op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
| 1436 | ENTRY(coprocessor_segment_overrun) |
| 1437 | zeroentry do_coprocessor_segment_overrun |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1438 | END(coprocessor_segment_overrun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | /* runs on exception stack */ |
| 1441 | ENTRY(double_fault) |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1442 | paranoiderrorentry do_double_fault |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1443 | END(double_fault) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
| 1445 | ENTRY(invalid_TSS) |
| 1446 | errorentry do_invalid_TSS |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1447 | END(invalid_TSS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | |
| 1449 | ENTRY(segment_not_present) |
| 1450 | errorentry do_segment_not_present |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1451 | END(segment_not_present) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | |
| 1453 | /* runs on exception stack */ |
| 1454 | ENTRY(stack_segment) |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1455 | paranoiderrorentry do_stack_segment |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1456 | END(stack_segment) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 1458 | KPROBE_ENTRY(general_protection) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | errorentry do_general_protection |
Prasanna S.P | d28c439 | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 1460 | KPROBE_END(general_protection) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | |
| 1462 | ENTRY(alignment_check) |
| 1463 | errorentry do_alignment_check |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1464 | END(alignment_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | |
| 1466 | ENTRY(divide_error) |
| 1467 | zeroentry do_divide_error |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1468 | END(divide_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | |
| 1470 | ENTRY(spurious_interrupt_bug) |
| 1471 | zeroentry do_spurious_interrupt_bug |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1472 | END(spurious_interrupt_bug) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | |
| 1474 | #ifdef CONFIG_X86_MCE |
| 1475 | /* runs on exception stack */ |
| 1476 | ENTRY(machine_check) |
Alexander van Heukelum | b8b1d08 | 2008-11-21 16:44:28 +0100 | [diff] [blame^] | 1477 | paranoidzeroentry do_machine_check |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1478 | END(machine_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | #endif |
| 1480 | |
Andi Kleen | 2699500 | 2006-08-02 22:37:28 +0200 | [diff] [blame] | 1481 | /* Call softirq on interrupt stack. Interrupts are off. */ |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 1482 | ENTRY(call_softirq) |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1483 | CFI_STARTPROC |
Andi Kleen | 2699500 | 2006-08-02 22:37:28 +0200 | [diff] [blame] | 1484 | push %rbp |
| 1485 | CFI_ADJUST_CFA_OFFSET 8 |
| 1486 | CFI_REL_OFFSET rbp,0 |
| 1487 | mov %rsp,%rbp |
| 1488 | CFI_DEF_CFA_REGISTER rbp |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 1489 | incl %gs:pda_irqcount |
Andi Kleen | 2699500 | 2006-08-02 22:37:28 +0200 | [diff] [blame] | 1490 | cmove %gs:pda_irqstackptr,%rsp |
| 1491 | push %rbp # backlink for old unwinder |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 1492 | call __do_softirq |
Andi Kleen | 2699500 | 2006-08-02 22:37:28 +0200 | [diff] [blame] | 1493 | leaveq |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1494 | CFI_DEF_CFA_REGISTER rsp |
Andi Kleen | 2699500 | 2006-08-02 22:37:28 +0200 | [diff] [blame] | 1495 | CFI_ADJUST_CFA_OFFSET -8 |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 1496 | decl %gs:pda_irqcount |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 1497 | ret |
Jan Beulich | 7effaa8 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 1498 | CFI_ENDPROC |
Jan Beulich | 4b787e0 | 2006-06-26 13:56:55 +0200 | [diff] [blame] | 1499 | ENDPROC(call_softirq) |
Andi Kleen | 75154f4 | 2007-06-23 02:29:25 +0200 | [diff] [blame] | 1500 | |
| 1501 | KPROBE_ENTRY(ignore_sysret) |
| 1502 | CFI_STARTPROC |
| 1503 | mov $-ENOSYS,%eax |
| 1504 | sysret |
| 1505 | CFI_ENDPROC |
| 1506 | ENDPROC(ignore_sysret) |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1507 | |
| 1508 | #ifdef CONFIG_XEN |
| 1509 | ENTRY(xen_hypervisor_callback) |
| 1510 | zeroentry xen_do_hypervisor_callback |
| 1511 | END(xen_hypervisor_callback) |
| 1512 | |
| 1513 | /* |
| 1514 | # A note on the "critical region" in our callback handler. |
| 1515 | # We want to avoid stacking callback handlers due to events occurring |
| 1516 | # during handling of the last event. To do this, we keep events disabled |
| 1517 | # until we've done all processing. HOWEVER, we must enable events before |
| 1518 | # popping the stack frame (can't be done atomically) and so it would still |
| 1519 | # be possible to get enough handler activations to overflow the stack. |
| 1520 | # Although unlikely, bugs of that kind are hard to track down, so we'd |
| 1521 | # like to avoid the possibility. |
| 1522 | # So, on entry to the handler we detect whether we interrupted an |
| 1523 | # existing activation in its critical region -- if so, we pop the current |
| 1524 | # activation and restart the handler using the previous one. |
| 1525 | */ |
| 1526 | ENTRY(xen_do_hypervisor_callback) # do_hypervisor_callback(struct *pt_regs) |
| 1527 | CFI_STARTPROC |
| 1528 | /* Since we don't modify %rdi, evtchn_do_upall(struct *pt_regs) will |
| 1529 | see the correct pointer to the pt_regs */ |
| 1530 | movq %rdi, %rsp # we don't return, adjust the stack frame |
| 1531 | CFI_ENDPROC |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1532 | DEFAULT_FRAME |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1533 | 11: incl %gs:pda_irqcount |
| 1534 | movq %rsp,%rbp |
| 1535 | CFI_DEF_CFA_REGISTER rbp |
| 1536 | cmovzq %gs:pda_irqstackptr,%rsp |
| 1537 | pushq %rbp # backlink for old unwinder |
| 1538 | call xen_evtchn_do_upcall |
| 1539 | popq %rsp |
| 1540 | CFI_DEF_CFA_REGISTER rsp |
| 1541 | decl %gs:pda_irqcount |
| 1542 | jmp error_exit |
| 1543 | CFI_ENDPROC |
| 1544 | END(do_hypervisor_callback) |
| 1545 | |
| 1546 | /* |
| 1547 | # Hypervisor uses this for application faults while it executes. |
| 1548 | # We get here for two reasons: |
| 1549 | # 1. Fault while reloading DS, ES, FS or GS |
| 1550 | # 2. Fault while executing IRET |
| 1551 | # Category 1 we do not need to fix up as Xen has already reloaded all segment |
| 1552 | # registers that could be reloaded and zeroed the others. |
| 1553 | # Category 2 we fix up by killing the current process. We cannot use the |
| 1554 | # normal Linux return path in this case because if we use the IRET hypercall |
| 1555 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. |
| 1556 | # We distinguish between categories by comparing each saved segment register |
| 1557 | # with its current contents: any discrepancy means we in category 1. |
| 1558 | */ |
| 1559 | ENTRY(xen_failsafe_callback) |
Alexander van Heukelum | dcd072e | 2008-11-20 14:40:11 +0100 | [diff] [blame] | 1560 | INTR_FRAME 1 (6*8) |
| 1561 | /*CFI_REL_OFFSET gs,GS*/ |
| 1562 | /*CFI_REL_OFFSET fs,FS*/ |
| 1563 | /*CFI_REL_OFFSET es,ES*/ |
| 1564 | /*CFI_REL_OFFSET ds,DS*/ |
| 1565 | CFI_REL_OFFSET r11,8 |
| 1566 | CFI_REL_OFFSET rcx,0 |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1567 | movw %ds,%cx |
| 1568 | cmpw %cx,0x10(%rsp) |
| 1569 | CFI_REMEMBER_STATE |
| 1570 | jne 1f |
| 1571 | movw %es,%cx |
| 1572 | cmpw %cx,0x18(%rsp) |
| 1573 | jne 1f |
| 1574 | movw %fs,%cx |
| 1575 | cmpw %cx,0x20(%rsp) |
| 1576 | jne 1f |
| 1577 | movw %gs,%cx |
| 1578 | cmpw %cx,0x28(%rsp) |
| 1579 | jne 1f |
| 1580 | /* All segments match their saved values => Category 2 (Bad IRET). */ |
| 1581 | movq (%rsp),%rcx |
| 1582 | CFI_RESTORE rcx |
| 1583 | movq 8(%rsp),%r11 |
| 1584 | CFI_RESTORE r11 |
| 1585 | addq $0x30,%rsp |
| 1586 | CFI_ADJUST_CFA_OFFSET -0x30 |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 1587 | pushq_cfi $0 /* RIP */ |
| 1588 | pushq_cfi %r11 |
| 1589 | pushq_cfi %rcx |
Jeremy Fitzhardinge | 4a5c3e7 | 2008-07-08 15:07:09 -0700 | [diff] [blame] | 1590 | jmp general_protection |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1591 | CFI_RESTORE_STATE |
| 1592 | 1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */ |
| 1593 | movq (%rsp),%rcx |
| 1594 | CFI_RESTORE rcx |
| 1595 | movq 8(%rsp),%r11 |
| 1596 | CFI_RESTORE r11 |
| 1597 | addq $0x30,%rsp |
| 1598 | CFI_ADJUST_CFA_OFFSET -0x30 |
Ingo Molnar | 14ae22b | 2008-11-21 15:20:47 +0100 | [diff] [blame] | 1599 | pushq_cfi $0 |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1600 | SAVE_ALL |
| 1601 | jmp error_exit |
| 1602 | CFI_ENDPROC |
Jeremy Fitzhardinge | 3d75e1b | 2008-07-08 15:06:49 -0700 | [diff] [blame] | 1603 | END(xen_failsafe_callback) |
| 1604 | |
| 1605 | #endif /* CONFIG_XEN */ |