Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | */ | |
5 | ||
6 | /* | |
7 | * entry.S contains the system-call and fault low-level handling routines. | |
8 | * This also contains the timer-interrupt handler, as well as all interrupts | |
9 | * and faults that can result in a task-switch. | |
10 | * | |
11 | * NOTE: This code handles signal-recognition, which happens every time | |
12 | * after a timer-interrupt and after each system call. | |
13 | * | |
14 | * I changed all the .align's to 4 (16 byte alignment), as that's faster | |
15 | * on a 486. | |
16 | * | |
889f21ce | 17 | * Stack layout in 'syscall_exit': |
1da177e4 LT |
18 | * ptrace needs to have all regs on the stack. |
19 | * if the order here is changed, it needs to be | |
20 | * updated in fork.c:copy_process, signal.c:do_signal, | |
21 | * ptrace.c and ptrace.h | |
22 | * | |
23 | * 0(%esp) - %ebx | |
24 | * 4(%esp) - %ecx | |
25 | * 8(%esp) - %edx | |
26 | * C(%esp) - %esi | |
27 | * 10(%esp) - %edi | |
28 | * 14(%esp) - %ebp | |
29 | * 18(%esp) - %eax | |
30 | * 1C(%esp) - %ds | |
31 | * 20(%esp) - %es | |
464d1a78 | 32 | * 24(%esp) - %fs |
ccbeed3a TH |
33 | * 28(%esp) - %gs saved iff !CONFIG_X86_32_LAZY_GS |
34 | * 2C(%esp) - orig_eax | |
35 | * 30(%esp) - %eip | |
36 | * 34(%esp) - %cs | |
37 | * 38(%esp) - %eflags | |
38 | * 3C(%esp) - %oldesp | |
39 | * 40(%esp) - %oldss | |
1da177e4 LT |
40 | * |
41 | * "current" is in register %ebx during any slow entries. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <linux/linkage.h> |
d7e7528b | 45 | #include <linux/err.h> |
1da177e4 | 46 | #include <asm/thread_info.h> |
55f327fa | 47 | #include <asm/irqflags.h> |
1da177e4 LT |
48 | #include <asm/errno.h> |
49 | #include <asm/segment.h> | |
50 | #include <asm/smp.h> | |
0341c14d | 51 | #include <asm/page_types.h> |
be44d2aa | 52 | #include <asm/percpu.h> |
fe7cacc1 | 53 | #include <asm/dwarf2.h> |
ab68ed98 | 54 | #include <asm/processor-flags.h> |
395a59d0 | 55 | #include <asm/ftrace.h> |
9b7dc567 | 56 | #include <asm/irq_vectors.h> |
40d2e763 | 57 | #include <asm/cpufeature.h> |
b4ca46e4 | 58 | #include <asm/alternative-asm.h> |
1da177e4 | 59 | |
af0575bb RM |
60 | /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
61 | #include <linux/elf-em.h> | |
62 | #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) | |
63 | #define __AUDIT_ARCH_LE 0x40000000 | |
64 | ||
65 | #ifndef CONFIG_AUDITSYSCALL | |
66 | #define sysenter_audit syscall_trace_entry | |
67 | #define sysexit_audit syscall_exit_work | |
68 | #endif | |
69 | ||
ea714547 JO |
70 | .section .entry.text, "ax" |
71 | ||
139ec7c4 RR |
72 | /* |
73 | * We use macros for low-level operations which need to be overridden | |
74 | * for paravirtualization. The following will never clobber any registers: | |
75 | * INTERRUPT_RETURN (aka. "iret") | |
76 | * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") | |
d75cd22f | 77 | * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). |
139ec7c4 RR |
78 | * |
79 | * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must | |
80 | * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). | |
81 | * Allowing a register to be clobbered can shrink the paravirt replacement | |
82 | * enough to patch inline, increasing performance. | |
83 | */ | |
84 | ||
1da177e4 | 85 | #ifdef CONFIG_PREEMPT |
139ec7c4 | 86 | #define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF |
1da177e4 | 87 | #else |
139ec7c4 | 88 | #define preempt_stop(clobbers) |
2e04bc76 | 89 | #define resume_kernel restore_all |
1da177e4 LT |
90 | #endif |
91 | ||
55f327fa IM |
92 | .macro TRACE_IRQS_IRET |
93 | #ifdef CONFIG_TRACE_IRQFLAGS | |
ab68ed98 | 94 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? |
55f327fa IM |
95 | jz 1f |
96 | TRACE_IRQS_ON | |
97 | 1: | |
98 | #endif | |
99 | .endm | |
100 | ||
ccbeed3a TH |
101 | /* |
102 | * User gs save/restore | |
103 | * | |
104 | * %gs is used for userland TLS and kernel only uses it for stack | |
105 | * canary which is required to be at %gs:20 by gcc. Read the comment | |
106 | * at the top of stackprotector.h for more info. | |
107 | * | |
108 | * Local labels 98 and 99 are used. | |
109 | */ | |
110 | #ifdef CONFIG_X86_32_LAZY_GS | |
111 | ||
112 | /* unfortunately push/pop can't be no-op */ | |
113 | .macro PUSH_GS | |
df5d1874 | 114 | pushl_cfi $0 |
ccbeed3a TH |
115 | .endm |
116 | .macro POP_GS pop=0 | |
117 | addl $(4 + \pop), %esp | |
118 | CFI_ADJUST_CFA_OFFSET -(4 + \pop) | |
119 | .endm | |
120 | .macro POP_GS_EX | |
121 | .endm | |
122 | ||
123 | /* all the rest are no-op */ | |
124 | .macro PTGS_TO_GS | |
125 | .endm | |
126 | .macro PTGS_TO_GS_EX | |
127 | .endm | |
128 | .macro GS_TO_REG reg | |
129 | .endm | |
130 | .macro REG_TO_PTGS reg | |
131 | .endm | |
132 | .macro SET_KERNEL_GS reg | |
133 | .endm | |
134 | ||
135 | #else /* CONFIG_X86_32_LAZY_GS */ | |
136 | ||
137 | .macro PUSH_GS | |
df5d1874 | 138 | pushl_cfi %gs |
ccbeed3a TH |
139 | /*CFI_REL_OFFSET gs, 0*/ |
140 | .endm | |
141 | ||
142 | .macro POP_GS pop=0 | |
df5d1874 | 143 | 98: popl_cfi %gs |
ccbeed3a TH |
144 | /*CFI_RESTORE gs*/ |
145 | .if \pop <> 0 | |
146 | add $\pop, %esp | |
147 | CFI_ADJUST_CFA_OFFSET -\pop | |
148 | .endif | |
149 | .endm | |
150 | .macro POP_GS_EX | |
151 | .pushsection .fixup, "ax" | |
152 | 99: movl $0, (%esp) | |
153 | jmp 98b | |
154 | .section __ex_table, "a" | |
155 | .align 4 | |
156 | .long 98b, 99b | |
157 | .popsection | |
158 | .endm | |
159 | ||
160 | .macro PTGS_TO_GS | |
161 | 98: mov PT_GS(%esp), %gs | |
162 | .endm | |
163 | .macro PTGS_TO_GS_EX | |
164 | .pushsection .fixup, "ax" | |
165 | 99: movl $0, PT_GS(%esp) | |
166 | jmp 98b | |
167 | .section __ex_table, "a" | |
168 | .align 4 | |
169 | .long 98b, 99b | |
170 | .popsection | |
171 | .endm | |
172 | ||
173 | .macro GS_TO_REG reg | |
174 | movl %gs, \reg | |
175 | /*CFI_REGISTER gs, \reg*/ | |
176 | .endm | |
177 | .macro REG_TO_PTGS reg | |
178 | movl \reg, PT_GS(%esp) | |
179 | /*CFI_REL_OFFSET gs, PT_GS*/ | |
180 | .endm | |
181 | .macro SET_KERNEL_GS reg | |
60a5317f | 182 | movl $(__KERNEL_STACK_CANARY), \reg |
ccbeed3a TH |
183 | movl \reg, %gs |
184 | .endm | |
185 | ||
186 | #endif /* CONFIG_X86_32_LAZY_GS */ | |
187 | ||
f0d96110 TH |
188 | .macro SAVE_ALL |
189 | cld | |
ccbeed3a | 190 | PUSH_GS |
df5d1874 | 191 | pushl_cfi %fs |
f0d96110 | 192 | /*CFI_REL_OFFSET fs, 0;*/ |
df5d1874 | 193 | pushl_cfi %es |
f0d96110 | 194 | /*CFI_REL_OFFSET es, 0;*/ |
df5d1874 | 195 | pushl_cfi %ds |
f0d96110 | 196 | /*CFI_REL_OFFSET ds, 0;*/ |
df5d1874 | 197 | pushl_cfi %eax |
f0d96110 | 198 | CFI_REL_OFFSET eax, 0 |
df5d1874 | 199 | pushl_cfi %ebp |
f0d96110 | 200 | CFI_REL_OFFSET ebp, 0 |
df5d1874 | 201 | pushl_cfi %edi |
f0d96110 | 202 | CFI_REL_OFFSET edi, 0 |
df5d1874 | 203 | pushl_cfi %esi |
f0d96110 | 204 | CFI_REL_OFFSET esi, 0 |
df5d1874 | 205 | pushl_cfi %edx |
f0d96110 | 206 | CFI_REL_OFFSET edx, 0 |
df5d1874 | 207 | pushl_cfi %ecx |
f0d96110 | 208 | CFI_REL_OFFSET ecx, 0 |
df5d1874 | 209 | pushl_cfi %ebx |
f0d96110 TH |
210 | CFI_REL_OFFSET ebx, 0 |
211 | movl $(__USER_DS), %edx | |
212 | movl %edx, %ds | |
213 | movl %edx, %es | |
214 | movl $(__KERNEL_PERCPU), %edx | |
464d1a78 | 215 | movl %edx, %fs |
ccbeed3a | 216 | SET_KERNEL_GS %edx |
f0d96110 | 217 | .endm |
1da177e4 | 218 | |
f0d96110 | 219 | .macro RESTORE_INT_REGS |
df5d1874 | 220 | popl_cfi %ebx |
f0d96110 | 221 | CFI_RESTORE ebx |
df5d1874 | 222 | popl_cfi %ecx |
f0d96110 | 223 | CFI_RESTORE ecx |
df5d1874 | 224 | popl_cfi %edx |
f0d96110 | 225 | CFI_RESTORE edx |
df5d1874 | 226 | popl_cfi %esi |
f0d96110 | 227 | CFI_RESTORE esi |
df5d1874 | 228 | popl_cfi %edi |
f0d96110 | 229 | CFI_RESTORE edi |
df5d1874 | 230 | popl_cfi %ebp |
f0d96110 | 231 | CFI_RESTORE ebp |
df5d1874 | 232 | popl_cfi %eax |
fe7cacc1 | 233 | CFI_RESTORE eax |
f0d96110 | 234 | .endm |
1da177e4 | 235 | |
ccbeed3a | 236 | .macro RESTORE_REGS pop=0 |
f0d96110 | 237 | RESTORE_INT_REGS |
df5d1874 | 238 | 1: popl_cfi %ds |
f0d96110 | 239 | /*CFI_RESTORE ds;*/ |
df5d1874 | 240 | 2: popl_cfi %es |
f0d96110 | 241 | /*CFI_RESTORE es;*/ |
df5d1874 | 242 | 3: popl_cfi %fs |
f0d96110 | 243 | /*CFI_RESTORE fs;*/ |
ccbeed3a | 244 | POP_GS \pop |
f0d96110 TH |
245 | .pushsection .fixup, "ax" |
246 | 4: movl $0, (%esp) | |
247 | jmp 1b | |
248 | 5: movl $0, (%esp) | |
249 | jmp 2b | |
250 | 6: movl $0, (%esp) | |
251 | jmp 3b | |
252 | .section __ex_table, "a" | |
253 | .align 4 | |
254 | .long 1b, 4b | |
255 | .long 2b, 5b | |
256 | .long 3b, 6b | |
f95d47ca | 257 | .popsection |
ccbeed3a | 258 | POP_GS_EX |
f0d96110 | 259 | .endm |
1da177e4 | 260 | |
f0d96110 TH |
261 | .macro RING0_INT_FRAME |
262 | CFI_STARTPROC simple | |
263 | CFI_SIGNAL_FRAME | |
264 | CFI_DEF_CFA esp, 3*4 | |
265 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 266 | CFI_OFFSET eip, -3*4 |
f0d96110 | 267 | .endm |
fe7cacc1 | 268 | |
f0d96110 TH |
269 | .macro RING0_EC_FRAME |
270 | CFI_STARTPROC simple | |
271 | CFI_SIGNAL_FRAME | |
272 | CFI_DEF_CFA esp, 4*4 | |
273 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 274 | CFI_OFFSET eip, -3*4 |
f0d96110 | 275 | .endm |
fe7cacc1 | 276 | |
f0d96110 TH |
277 | .macro RING0_PTREGS_FRAME |
278 | CFI_STARTPROC simple | |
279 | CFI_SIGNAL_FRAME | |
280 | CFI_DEF_CFA esp, PT_OLDESP-PT_EBX | |
281 | /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ | |
282 | CFI_OFFSET eip, PT_EIP-PT_OLDESP | |
283 | /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ | |
284 | /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ | |
285 | CFI_OFFSET eax, PT_EAX-PT_OLDESP | |
286 | CFI_OFFSET ebp, PT_EBP-PT_OLDESP | |
287 | CFI_OFFSET edi, PT_EDI-PT_OLDESP | |
288 | CFI_OFFSET esi, PT_ESI-PT_OLDESP | |
289 | CFI_OFFSET edx, PT_EDX-PT_OLDESP | |
290 | CFI_OFFSET ecx, PT_ECX-PT_OLDESP | |
eb5b7b9d | 291 | CFI_OFFSET ebx, PT_EBX-PT_OLDESP |
f0d96110 | 292 | .endm |
1da177e4 LT |
293 | |
294 | ENTRY(ret_from_fork) | |
fe7cacc1 | 295 | CFI_STARTPROC |
df5d1874 | 296 | pushl_cfi %eax |
1da177e4 LT |
297 | call schedule_tail |
298 | GET_THREAD_INFO(%ebp) | |
df5d1874 JB |
299 | popl_cfi %eax |
300 | pushl_cfi $0x0202 # Reset kernel eflags | |
301 | popfl_cfi | |
1da177e4 | 302 | jmp syscall_exit |
fe7cacc1 | 303 | CFI_ENDPROC |
47a55cd7 | 304 | END(ret_from_fork) |
1da177e4 | 305 | |
a00e817f MH |
306 | /* |
307 | * Interrupt exit functions should be protected against kprobes | |
308 | */ | |
309 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
310 | /* |
311 | * Return to user mode is not as complex as all this looks, | |
312 | * but we want the default path for a system call return to | |
313 | * go as quickly as possible which is why some of this is | |
314 | * less clear than it otherwise should be. | |
315 | */ | |
316 | ||
317 | # userspace resumption stub bypassing syscall exit tracing | |
318 | ALIGN | |
fe7cacc1 | 319 | RING0_PTREGS_FRAME |
1da177e4 | 320 | ret_from_exception: |
139ec7c4 | 321 | preempt_stop(CLBR_ANY) |
1da177e4 LT |
322 | ret_from_intr: |
323 | GET_THREAD_INFO(%ebp) | |
29a2e283 DA |
324 | resume_userspace_sig: |
325 | #ifdef CONFIG_VM86 | |
eb5b7b9d JF |
326 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
327 | movb PT_CS(%esp), %al | |
ab68ed98 | 328 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
29a2e283 DA |
329 | #else |
330 | /* | |
331 | * We can be coming here from a syscall done in the kernel space, | |
332 | * e.g. a failed kernel_execve(). | |
333 | */ | |
334 | movl PT_CS(%esp), %eax | |
335 | andl $SEGMENT_RPL_MASK, %eax | |
336 | #endif | |
78be3706 RR |
337 | cmpl $USER_RPL, %eax |
338 | jb resume_kernel # not returning to v8086 or userspace | |
f95d47ca | 339 | |
1da177e4 | 340 | ENTRY(resume_userspace) |
c7e872e7 | 341 | LOCKDEP_SYS_EXIT |
139ec7c4 | 342 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
343 | # setting need_resched or sigpending |
344 | # between sampling and the iret | |
e32e58a9 | 345 | TRACE_IRQS_OFF |
1da177e4 LT |
346 | movl TI_flags(%ebp), %ecx |
347 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
348 | # int/exception return? | |
349 | jne work_pending | |
350 | jmp restore_all | |
47a55cd7 | 351 | END(ret_from_exception) |
1da177e4 LT |
352 | |
353 | #ifdef CONFIG_PREEMPT | |
354 | ENTRY(resume_kernel) | |
139ec7c4 | 355 | DISABLE_INTERRUPTS(CLBR_ANY) |
1da177e4 | 356 | cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? |
2e04bc76 | 357 | jnz restore_all |
1da177e4 LT |
358 | need_resched: |
359 | movl TI_flags(%ebp), %ecx # need_resched set ? | |
360 | testb $_TIF_NEED_RESCHED, %cl | |
361 | jz restore_all | |
ab68ed98 | 362 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
1da177e4 LT |
363 | jz restore_all |
364 | call preempt_schedule_irq | |
365 | jmp need_resched | |
47a55cd7 | 366 | END(resume_kernel) |
1da177e4 | 367 | #endif |
fe7cacc1 | 368 | CFI_ENDPROC |
a00e817f MH |
369 | /* |
370 | * End of kprobes section | |
371 | */ | |
372 | .popsection | |
1da177e4 LT |
373 | |
374 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
375 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
376 | ||
377 | # sysenter call handler stub | |
0aa97fb2 | 378 | ENTRY(ia32_sysenter_target) |
fe7cacc1 | 379 | CFI_STARTPROC simple |
adf14236 | 380 | CFI_SIGNAL_FRAME |
fe7cacc1 JB |
381 | CFI_DEF_CFA esp, 0 |
382 | CFI_REGISTER esp, ebp | |
faca6227 | 383 | movl TSS_sysenter_sp0(%esp),%esp |
1da177e4 | 384 | sysenter_past_esp: |
55f327fa | 385 | /* |
d93c870b JF |
386 | * Interrupts are disabled here, but we can't trace it until |
387 | * enough kernel state to call TRACE_IRQS_OFF can be called - but | |
388 | * we immediately enable interrupts at that point anyway. | |
55f327fa | 389 | */ |
3234282f | 390 | pushl_cfi $__USER_DS |
fe7cacc1 | 391 | /*CFI_REL_OFFSET ss, 0*/ |
df5d1874 | 392 | pushl_cfi %ebp |
fe7cacc1 | 393 | CFI_REL_OFFSET esp, 0 |
df5d1874 | 394 | pushfl_cfi |
d93c870b | 395 | orl $X86_EFLAGS_IF, (%esp) |
3234282f | 396 | pushl_cfi $__USER_CS |
fe7cacc1 | 397 | /*CFI_REL_OFFSET cs, 0*/ |
e6e5494c IM |
398 | /* |
399 | * Push current_thread_info()->sysenter_return to the stack. | |
400 | * A tiny bit of offset fixup is necessary - 4*4 means the 4 words | |
401 | * pushed above; +8 corresponds to copy_thread's esp0 setting. | |
402 | */ | |
7bf04be8 | 403 | pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) |
fe7cacc1 | 404 | CFI_REL_OFFSET eip, 0 |
1da177e4 | 405 | |
df5d1874 | 406 | pushl_cfi %eax |
d93c870b JF |
407 | SAVE_ALL |
408 | ENABLE_INTERRUPTS(CLBR_NONE) | |
409 | ||
1da177e4 LT |
410 | /* |
411 | * Load the potential sixth argument from user stack. | |
412 | * Careful about security. | |
413 | */ | |
414 | cmpl $__PAGE_OFFSET-3,%ebp | |
415 | jae syscall_fault | |
416 | 1: movl (%ebp),%ebp | |
d93c870b | 417 | movl %ebp,PT_EBP(%esp) |
1da177e4 LT |
418 | .section __ex_table,"a" |
419 | .align 4 | |
420 | .long 1b,syscall_fault | |
421 | .previous | |
422 | ||
1da177e4 LT |
423 | GET_THREAD_INFO(%ebp) |
424 | ||
88200bc2 | 425 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
af0575bb RM |
426 | jnz sysenter_audit |
427 | sysenter_do_call: | |
303395ac | 428 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
429 | jae syscall_badsys |
430 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 431 | movl %eax,PT_EAX(%esp) |
c7e872e7 | 432 | LOCKDEP_SYS_EXIT |
42c24fa2 | 433 | DISABLE_INTERRUPTS(CLBR_ANY) |
55f327fa | 434 | TRACE_IRQS_OFF |
1da177e4 | 435 | movl TI_flags(%ebp), %ecx |
88200bc2 | 436 | testl $_TIF_ALLWORK_MASK, %ecx |
af0575bb RM |
437 | jne sysexit_audit |
438 | sysenter_exit: | |
1da177e4 | 439 | /* if something modifies registers it must also disable sysexit */ |
eb5b7b9d JF |
440 | movl PT_EIP(%esp), %edx |
441 | movl PT_OLDESP(%esp), %ecx | |
1da177e4 | 442 | xorl %ebp,%ebp |
55f327fa | 443 | TRACE_IRQS_ON |
464d1a78 | 444 | 1: mov PT_FS(%esp), %fs |
ccbeed3a | 445 | PTGS_TO_GS |
d75cd22f | 446 | ENABLE_INTERRUPTS_SYSEXIT |
af0575bb RM |
447 | |
448 | #ifdef CONFIG_AUDITSYSCALL | |
449 | sysenter_audit: | |
88200bc2 | 450 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
af0575bb RM |
451 | jnz syscall_trace_entry |
452 | addl $4,%esp | |
453 | CFI_ADJUST_CFA_OFFSET -4 | |
454 | /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ | |
455 | /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ | |
456 | /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ | |
457 | movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ | |
458 | movl %eax,%edx /* 2nd arg: syscall number */ | |
459 | movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ | |
b05d8447 | 460 | call __audit_syscall_entry |
df5d1874 | 461 | pushl_cfi %ebx |
af0575bb RM |
462 | movl PT_EAX(%esp),%eax /* reload syscall number */ |
463 | jmp sysenter_do_call | |
464 | ||
465 | sysexit_audit: | |
88200bc2 | 466 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
467 | jne syscall_exit_work |
468 | TRACE_IRQS_ON | |
469 | ENABLE_INTERRUPTS(CLBR_ANY) | |
470 | movl %eax,%edx /* second arg, syscall return value */ | |
d7e7528b EP |
471 | cmpl $-MAX_ERRNO,%eax /* is it an error ? */ |
472 | setbe %al /* 1 if so, 0 if not */ | |
af0575bb | 473 | movzbl %al,%eax /* zero-extend that */ |
d7e7528b | 474 | call __audit_syscall_exit |
af0575bb RM |
475 | DISABLE_INTERRUPTS(CLBR_ANY) |
476 | TRACE_IRQS_OFF | |
477 | movl TI_flags(%ebp), %ecx | |
88200bc2 | 478 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
479 | jne syscall_exit_work |
480 | movl PT_EAX(%esp),%eax /* reload syscall return value */ | |
481 | jmp sysenter_exit | |
482 | #endif | |
483 | ||
fe7cacc1 | 484 | CFI_ENDPROC |
f95d47ca | 485 | .pushsection .fixup,"ax" |
464d1a78 | 486 | 2: movl $0,PT_FS(%esp) |
f95d47ca JF |
487 | jmp 1b |
488 | .section __ex_table,"a" | |
489 | .align 4 | |
490 | .long 1b,2b | |
491 | .popsection | |
ccbeed3a | 492 | PTGS_TO_GS_EX |
0aa97fb2 | 493 | ENDPROC(ia32_sysenter_target) |
1da177e4 | 494 | |
a00e817f MH |
495 | /* |
496 | * syscall stub including irq exit should be protected against kprobes | |
497 | */ | |
498 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
499 | # system call handler stub |
500 | ENTRY(system_call) | |
fe7cacc1 | 501 | RING0_INT_FRAME # can't unwind into user space anyway |
df5d1874 | 502 | pushl_cfi %eax # save orig_eax |
1da177e4 LT |
503 | SAVE_ALL |
504 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 505 | # system call tracing in operation / emulation |
88200bc2 | 506 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
1da177e4 | 507 | jnz syscall_trace_entry |
303395ac | 508 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
509 | jae syscall_badsys |
510 | syscall_call: | |
511 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 512 | movl %eax,PT_EAX(%esp) # store the return value |
1da177e4 | 513 | syscall_exit: |
c7e872e7 | 514 | LOCKDEP_SYS_EXIT |
139ec7c4 | 515 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
516 | # setting need_resched or sigpending |
517 | # between sampling and the iret | |
55f327fa | 518 | TRACE_IRQS_OFF |
1da177e4 | 519 | movl TI_flags(%ebp), %ecx |
88200bc2 | 520 | testl $_TIF_ALLWORK_MASK, %ecx # current->work |
1da177e4 LT |
521 | jne syscall_exit_work |
522 | ||
523 | restore_all: | |
2e04bc76 AH |
524 | TRACE_IRQS_IRET |
525 | restore_all_notrace: | |
eb5b7b9d JF |
526 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
527 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we | |
5df24082 SS |
528 | # are returning to the kernel. |
529 | # See comments in process.c:copy_thread() for details. | |
eb5b7b9d JF |
530 | movb PT_OLDSS(%esp), %ah |
531 | movb PT_CS(%esp), %al | |
ab68ed98 | 532 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
78be3706 | 533 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
fe7cacc1 | 534 | CFI_REMEMBER_STATE |
1da177e4 LT |
535 | je ldt_ss # returning to user-space with LDT SS |
536 | restore_nocheck: | |
ccbeed3a | 537 | RESTORE_REGS 4 # skip orig_eax/error_code |
f7f3d791 | 538 | irq_return: |
3701d863 | 539 | INTERRUPT_RETURN |
1da177e4 | 540 | .section .fixup,"ax" |
90e9f536 | 541 | ENTRY(iret_exc) |
a879cbbb LT |
542 | pushl $0 # no error code |
543 | pushl $do_iret_error | |
544 | jmp error_code | |
1da177e4 LT |
545 | .previous |
546 | .section __ex_table,"a" | |
547 | .align 4 | |
3701d863 | 548 | .long irq_return,iret_exc |
1da177e4 LT |
549 | .previous |
550 | ||
fe7cacc1 | 551 | CFI_RESTORE_STATE |
1da177e4 | 552 | ldt_ss: |
eb5b7b9d | 553 | larl PT_OLDSS(%esp), %eax |
1da177e4 LT |
554 | jnz restore_nocheck |
555 | testl $0x00400000, %eax # returning to 32bit stack? | |
556 | jnz restore_nocheck # allright, normal return | |
d3561b7f RR |
557 | |
558 | #ifdef CONFIG_PARAVIRT | |
559 | /* | |
560 | * The kernel can't run on a non-flat stack if paravirt mode | |
561 | * is active. Rather than try to fixup the high bits of | |
562 | * ESP, bypass this code entirely. This may break DOSemu | |
563 | * and/or Wine support in a paravirt VM, although the option | |
564 | * is still available to implement the setting of the high | |
565 | * 16-bits in the INTERRUPT_RETURN paravirt-op. | |
566 | */ | |
93b1eab3 | 567 | cmpl $0, pv_info+PARAVIRT_enabled |
d3561b7f RR |
568 | jne restore_nocheck |
569 | #endif | |
570 | ||
dc4c2a0a AH |
571 | /* |
572 | * Setup and switch to ESPFIX stack | |
573 | * | |
574 | * We're returning to userspace with a 16 bit stack. The CPU will not | |
575 | * restore the high word of ESP for us on executing iret... This is an | |
576 | * "official" bug of all the x86-compatible CPUs, which we can work | |
577 | * around to make dosemu and wine happy. We do this by preloading the | |
578 | * high word of ESP with the high word of the userspace ESP while | |
579 | * compensating for the offset by changing to the ESPFIX segment with | |
580 | * a base address that matches for the difference. | |
581 | */ | |
72c511dd | 582 | #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) |
dc4c2a0a AH |
583 | mov %esp, %edx /* load kernel esp */ |
584 | mov PT_OLDESP(%esp), %eax /* load userspace esp */ | |
585 | mov %dx, %ax /* eax: new kernel esp */ | |
586 | sub %eax, %edx /* offset (low word is 0) */ | |
dc4c2a0a | 587 | shr $16, %edx |
72c511dd BG |
588 | mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ |
589 | mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ | |
df5d1874 JB |
590 | pushl_cfi $__ESPFIX_SS |
591 | pushl_cfi %eax /* new kernel esp */ | |
2e04bc76 AH |
592 | /* Disable interrupts, but do not irqtrace this section: we |
593 | * will soon execute iret and the tracer was already set to | |
594 | * the irqstate after the iret */ | |
139ec7c4 | 595 | DISABLE_INTERRUPTS(CLBR_EAX) |
dc4c2a0a | 596 | lss (%esp), %esp /* switch to espfix segment */ |
be44d2aa SS |
597 | CFI_ADJUST_CFA_OFFSET -8 |
598 | jmp restore_nocheck | |
fe7cacc1 | 599 | CFI_ENDPROC |
47a55cd7 | 600 | ENDPROC(system_call) |
1da177e4 LT |
601 | |
602 | # perform work that needs to be done immediately before resumption | |
603 | ALIGN | |
fe7cacc1 | 604 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
1da177e4 LT |
605 | work_pending: |
606 | testb $_TIF_NEED_RESCHED, %cl | |
607 | jz work_notifysig | |
608 | work_resched: | |
609 | call schedule | |
c7e872e7 | 610 | LOCKDEP_SYS_EXIT |
139ec7c4 | 611 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
612 | # setting need_resched or sigpending |
613 | # between sampling and the iret | |
55f327fa | 614 | TRACE_IRQS_OFF |
1da177e4 LT |
615 | movl TI_flags(%ebp), %ecx |
616 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
617 | # than syscall tracing? | |
618 | jz restore_all | |
619 | testb $_TIF_NEED_RESCHED, %cl | |
620 | jnz work_resched | |
621 | ||
622 | work_notifysig: # deal with pending signals and | |
623 | # notify-resume requests | |
74b47a78 | 624 | #ifdef CONFIG_VM86 |
ab68ed98 | 625 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
1da177e4 LT |
626 | movl %esp, %eax |
627 | jne work_notifysig_v86 # returning to kernel-space or | |
628 | # vm86-space | |
3596ff4e SD |
629 | TRACE_IRQS_ON |
630 | ENABLE_INTERRUPTS(CLBR_NONE) | |
1da177e4 LT |
631 | xorl %edx, %edx |
632 | call do_notify_resume | |
4031ff38 | 633 | jmp resume_userspace_sig |
1da177e4 LT |
634 | |
635 | ALIGN | |
636 | work_notifysig_v86: | |
df5d1874 | 637 | pushl_cfi %ecx # save ti_flags for do_notify_resume |
1da177e4 | 638 | call save_v86_state # %eax contains pt_regs pointer |
df5d1874 | 639 | popl_cfi %ecx |
1da177e4 | 640 | movl %eax, %esp |
74b47a78 JK |
641 | #else |
642 | movl %esp, %eax | |
643 | #endif | |
3596ff4e SD |
644 | TRACE_IRQS_ON |
645 | ENABLE_INTERRUPTS(CLBR_NONE) | |
1da177e4 LT |
646 | xorl %edx, %edx |
647 | call do_notify_resume | |
4031ff38 | 648 | jmp resume_userspace_sig |
47a55cd7 | 649 | END(work_pending) |
1da177e4 LT |
650 | |
651 | # perform syscall exit tracing | |
652 | ALIGN | |
653 | syscall_trace_entry: | |
eb5b7b9d | 654 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 655 | movl %esp, %eax |
d4d67150 RM |
656 | call syscall_trace_enter |
657 | /* What it returned is what we'll actually use. */ | |
303395ac | 658 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
659 | jnae syscall_call |
660 | jmp syscall_exit | |
47a55cd7 | 661 | END(syscall_trace_entry) |
1da177e4 LT |
662 | |
663 | # perform syscall exit tracing | |
664 | ALIGN | |
665 | syscall_exit_work: | |
88200bc2 | 666 | testl $_TIF_WORK_SYSCALL_EXIT, %ecx |
1da177e4 | 667 | jz work_pending |
55f327fa | 668 | TRACE_IRQS_ON |
d4d67150 | 669 | ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call |
1da177e4 LT |
670 | # schedule() instead |
671 | movl %esp, %eax | |
d4d67150 | 672 | call syscall_trace_leave |
1da177e4 | 673 | jmp resume_userspace |
47a55cd7 | 674 | END(syscall_exit_work) |
fe7cacc1 | 675 | CFI_ENDPROC |
1da177e4 | 676 | |
fe7cacc1 | 677 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 678 | syscall_fault: |
1da177e4 | 679 | GET_THREAD_INFO(%ebp) |
eb5b7b9d | 680 | movl $-EFAULT,PT_EAX(%esp) |
1da177e4 | 681 | jmp resume_userspace |
47a55cd7 | 682 | END(syscall_fault) |
1da177e4 | 683 | |
1da177e4 | 684 | syscall_badsys: |
eb5b7b9d | 685 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 686 | jmp resume_userspace |
47a55cd7 | 687 | END(syscall_badsys) |
fe7cacc1 | 688 | CFI_ENDPROC |
a00e817f MH |
689 | /* |
690 | * End of kprobes section | |
691 | */ | |
692 | .popsection | |
1da177e4 | 693 | |
253f29a4 BG |
694 | /* |
695 | * System calls that need a pt_regs pointer. | |
696 | */ | |
e258e4e0 | 697 | #define PTREGSCALL0(name) \ |
303395ac | 698 | ENTRY(ptregs_##name) ; \ |
253f29a4 | 699 | leal 4(%esp),%eax; \ |
303395ac PA |
700 | jmp sys_##name; \ |
701 | ENDPROC(ptregs_##name) | |
253f29a4 | 702 | |
e258e4e0 | 703 | #define PTREGSCALL1(name) \ |
303395ac | 704 | ENTRY(ptregs_##name) ; \ |
e258e4e0 | 705 | leal 4(%esp),%edx; \ |
ce9119ad | 706 | movl (PT_EBX+4)(%esp),%eax; \ |
303395ac PA |
707 | jmp sys_##name; \ |
708 | ENDPROC(ptregs_##name) | |
e258e4e0 BG |
709 | |
710 | #define PTREGSCALL2(name) \ | |
303395ac | 711 | ENTRY(ptregs_##name) ; \ |
e258e4e0 | 712 | leal 4(%esp),%ecx; \ |
ce9119ad PA |
713 | movl (PT_ECX+4)(%esp),%edx; \ |
714 | movl (PT_EBX+4)(%esp),%eax; \ | |
303395ac PA |
715 | jmp sys_##name; \ |
716 | ENDPROC(ptregs_##name) | |
e258e4e0 BG |
717 | |
718 | #define PTREGSCALL3(name) \ | |
303395ac | 719 | ENTRY(ptregs_##name) ; \ |
a34107b5 | 720 | CFI_STARTPROC; \ |
e258e4e0 | 721 | leal 4(%esp),%eax; \ |
a34107b5 | 722 | pushl_cfi %eax; \ |
e258e4e0 BG |
723 | movl PT_EDX(%eax),%ecx; \ |
724 | movl PT_ECX(%eax),%edx; \ | |
725 | movl PT_EBX(%eax),%eax; \ | |
726 | call sys_##name; \ | |
727 | addl $4,%esp; \ | |
a34107b5 JB |
728 | CFI_ADJUST_CFA_OFFSET -4; \ |
729 | ret; \ | |
730 | CFI_ENDPROC; \ | |
731 | ENDPROC(ptregs_##name) | |
e258e4e0 | 732 | |
27f59559 | 733 | PTREGSCALL1(iopl) |
e258e4e0 | 734 | PTREGSCALL0(fork) |
e258e4e0 | 735 | PTREGSCALL0(vfork) |
11cf88bd | 736 | PTREGSCALL3(execve) |
052acad4 | 737 | PTREGSCALL2(sigaltstack) |
e258e4e0 BG |
738 | PTREGSCALL0(sigreturn) |
739 | PTREGSCALL0(rt_sigreturn) | |
f1382f15 BG |
740 | PTREGSCALL2(vm86) |
741 | PTREGSCALL1(vm86old) | |
253f29a4 | 742 | |
f839bbc5 | 743 | /* Clone is an oddball. The 4th arg is in %edi */ |
303395ac | 744 | ENTRY(ptregs_clone) |
a34107b5 | 745 | CFI_STARTPROC |
f839bbc5 | 746 | leal 4(%esp),%eax |
a34107b5 JB |
747 | pushl_cfi %eax |
748 | pushl_cfi PT_EDI(%eax) | |
f839bbc5 BG |
749 | movl PT_EDX(%eax),%ecx |
750 | movl PT_ECX(%eax),%edx | |
751 | movl PT_EBX(%eax),%eax | |
752 | call sys_clone | |
753 | addl $8,%esp | |
a34107b5 | 754 | CFI_ADJUST_CFA_OFFSET -8 |
f839bbc5 | 755 | ret |
a34107b5 JB |
756 | CFI_ENDPROC |
757 | ENDPROC(ptregs_clone) | |
f839bbc5 | 758 | |
f0d96110 | 759 | .macro FIXUP_ESPFIX_STACK |
dc4c2a0a AH |
760 | /* |
761 | * Switch back for ESPFIX stack to the normal zerobased stack | |
762 | * | |
763 | * We can't call C functions using the ESPFIX stack. This code reads | |
764 | * the high word of the segment base from the GDT and swiches to the | |
765 | * normal stack and adjusts ESP with the matching offset. | |
766 | */ | |
767 | /* fixup the stack */ | |
72c511dd BG |
768 | mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ |
769 | mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ | |
dc4c2a0a AH |
770 | shl $16, %eax |
771 | addl %esp, %eax /* the adjusted stack pointer */ | |
df5d1874 JB |
772 | pushl_cfi $__KERNEL_DS |
773 | pushl_cfi %eax | |
dc4c2a0a | 774 | lss (%esp), %esp /* switch to the normal stack segment */ |
f0d96110 TH |
775 | CFI_ADJUST_CFA_OFFSET -8 |
776 | .endm | |
777 | .macro UNWIND_ESPFIX_STACK | |
778 | movl %ss, %eax | |
779 | /* see if on espfix stack */ | |
780 | cmpw $__ESPFIX_SS, %ax | |
781 | jne 27f | |
782 | movl $__KERNEL_DS, %eax | |
783 | movl %eax, %ds | |
784 | movl %eax, %es | |
785 | /* switch to normal stack */ | |
786 | FIXUP_ESPFIX_STACK | |
787 | 27: | |
788 | .endm | |
1da177e4 LT |
789 | |
790 | /* | |
b7c6244f PA |
791 | * Build the entry stubs and pointer table with some assembler magic. |
792 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
793 | * single cache line on all modern x86 implementations. | |
1da177e4 | 794 | */ |
4687518c | 795 | .section .init.rodata,"a" |
1da177e4 | 796 | ENTRY(interrupt) |
ea714547 | 797 | .section .entry.text, "ax" |
b7c6244f PA |
798 | .p2align 5 |
799 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
1da177e4 | 800 | ENTRY(irq_entries_start) |
fe7cacc1 | 801 | RING0_INT_FRAME |
4687518c | 802 | vector=FIRST_EXTERNAL_VECTOR |
b7c6244f PA |
803 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 |
804 | .balign 32 | |
805 | .rept 7 | |
806 | .if vector < NR_VECTORS | |
8665596e | 807 | .if vector <> FIRST_EXTERNAL_VECTOR |
fe7cacc1 | 808 | CFI_ADJUST_CFA_OFFSET -4 |
b7c6244f | 809 | .endif |
df5d1874 | 810 | 1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ |
8665596e | 811 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
b7c6244f PA |
812 | jmp 2f |
813 | .endif | |
814 | .previous | |
1da177e4 | 815 | .long 1b |
ea714547 | 816 | .section .entry.text, "ax" |
1da177e4 | 817 | vector=vector+1 |
b7c6244f PA |
818 | .endif |
819 | .endr | |
820 | 2: jmp common_interrupt | |
1da177e4 | 821 | .endr |
47a55cd7 JB |
822 | END(irq_entries_start) |
823 | ||
824 | .previous | |
825 | END(interrupt) | |
826 | .previous | |
1da177e4 | 827 | |
55f327fa IM |
828 | /* |
829 | * the CPU automatically disables interrupts when executing an IRQ vector, | |
830 | * so IRQ-flags tracing has to follow that: | |
831 | */ | |
b7c6244f | 832 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
1da177e4 | 833 | common_interrupt: |
b7c6244f | 834 | addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ |
1da177e4 | 835 | SAVE_ALL |
55f327fa | 836 | TRACE_IRQS_OFF |
1da177e4 LT |
837 | movl %esp,%eax |
838 | call do_IRQ | |
839 | jmp ret_from_intr | |
47a55cd7 | 840 | ENDPROC(common_interrupt) |
fe7cacc1 | 841 | CFI_ENDPROC |
1da177e4 | 842 | |
a00e817f MH |
843 | /* |
844 | * Irq entries should be protected against kprobes | |
845 | */ | |
846 | .pushsection .kprobes.text, "ax" | |
02cf94c3 | 847 | #define BUILD_INTERRUPT3(name, nr, fn) \ |
1da177e4 | 848 | ENTRY(name) \ |
fe7cacc1 | 849 | RING0_INT_FRAME; \ |
df5d1874 | 850 | pushl_cfi $~(nr); \ |
fe7cacc1 | 851 | SAVE_ALL; \ |
55f327fa | 852 | TRACE_IRQS_OFF \ |
1da177e4 | 853 | movl %esp,%eax; \ |
02cf94c3 | 854 | call fn; \ |
55f327fa | 855 | jmp ret_from_intr; \ |
47a55cd7 JB |
856 | CFI_ENDPROC; \ |
857 | ENDPROC(name) | |
1da177e4 | 858 | |
02cf94c3 TH |
859 | #define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) |
860 | ||
1da177e4 | 861 | /* The include is where all of the SMP etc. interrupts come from */ |
1164dd00 | 862 | #include <asm/entry_arch.h> |
1da177e4 | 863 | |
1da177e4 | 864 | ENTRY(coprocessor_error) |
fe7cacc1 | 865 | RING0_INT_FRAME |
df5d1874 JB |
866 | pushl_cfi $0 |
867 | pushl_cfi $do_coprocessor_error | |
1da177e4 | 868 | jmp error_code |
fe7cacc1 | 869 | CFI_ENDPROC |
47a55cd7 | 870 | END(coprocessor_error) |
1da177e4 LT |
871 | |
872 | ENTRY(simd_coprocessor_error) | |
fe7cacc1 | 873 | RING0_INT_FRAME |
df5d1874 | 874 | pushl_cfi $0 |
40d2e763 BG |
875 | #ifdef CONFIG_X86_INVD_BUG |
876 | /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ | |
df5d1874 | 877 | 661: pushl_cfi $do_general_protection |
40d2e763 BG |
878 | 662: |
879 | .section .altinstructions,"a" | |
b4ca46e4 | 880 | altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f |
40d2e763 BG |
881 | .previous |
882 | .section .altinstr_replacement,"ax" | |
883 | 663: pushl $do_simd_coprocessor_error | |
884 | 664: | |
885 | .previous | |
886 | #else | |
df5d1874 | 887 | pushl_cfi $do_simd_coprocessor_error |
40d2e763 | 888 | #endif |
1da177e4 | 889 | jmp error_code |
fe7cacc1 | 890 | CFI_ENDPROC |
47a55cd7 | 891 | END(simd_coprocessor_error) |
1da177e4 LT |
892 | |
893 | ENTRY(device_not_available) | |
fe7cacc1 | 894 | RING0_INT_FRAME |
df5d1874 JB |
895 | pushl_cfi $-1 # mark this as an int |
896 | pushl_cfi $do_device_not_available | |
7643e9b9 | 897 | jmp error_code |
fe7cacc1 | 898 | CFI_ENDPROC |
47a55cd7 | 899 | END(device_not_available) |
1da177e4 | 900 | |
d3561b7f RR |
901 | #ifdef CONFIG_PARAVIRT |
902 | ENTRY(native_iret) | |
3701d863 | 903 | iret |
d3561b7f RR |
904 | .section __ex_table,"a" |
905 | .align 4 | |
3701d863 | 906 | .long native_iret, iret_exc |
d3561b7f | 907 | .previous |
47a55cd7 | 908 | END(native_iret) |
d3561b7f | 909 | |
d75cd22f | 910 | ENTRY(native_irq_enable_sysexit) |
d3561b7f RR |
911 | sti |
912 | sysexit | |
d75cd22f | 913 | END(native_irq_enable_sysexit) |
d3561b7f RR |
914 | #endif |
915 | ||
1da177e4 | 916 | ENTRY(overflow) |
fe7cacc1 | 917 | RING0_INT_FRAME |
df5d1874 JB |
918 | pushl_cfi $0 |
919 | pushl_cfi $do_overflow | |
1da177e4 | 920 | jmp error_code |
fe7cacc1 | 921 | CFI_ENDPROC |
47a55cd7 | 922 | END(overflow) |
1da177e4 LT |
923 | |
924 | ENTRY(bounds) | |
fe7cacc1 | 925 | RING0_INT_FRAME |
df5d1874 JB |
926 | pushl_cfi $0 |
927 | pushl_cfi $do_bounds | |
1da177e4 | 928 | jmp error_code |
fe7cacc1 | 929 | CFI_ENDPROC |
47a55cd7 | 930 | END(bounds) |
1da177e4 LT |
931 | |
932 | ENTRY(invalid_op) | |
fe7cacc1 | 933 | RING0_INT_FRAME |
df5d1874 JB |
934 | pushl_cfi $0 |
935 | pushl_cfi $do_invalid_op | |
1da177e4 | 936 | jmp error_code |
fe7cacc1 | 937 | CFI_ENDPROC |
47a55cd7 | 938 | END(invalid_op) |
1da177e4 LT |
939 | |
940 | ENTRY(coprocessor_segment_overrun) | |
fe7cacc1 | 941 | RING0_INT_FRAME |
df5d1874 JB |
942 | pushl_cfi $0 |
943 | pushl_cfi $do_coprocessor_segment_overrun | |
1da177e4 | 944 | jmp error_code |
fe7cacc1 | 945 | CFI_ENDPROC |
47a55cd7 | 946 | END(coprocessor_segment_overrun) |
1da177e4 LT |
947 | |
948 | ENTRY(invalid_TSS) | |
fe7cacc1 | 949 | RING0_EC_FRAME |
df5d1874 | 950 | pushl_cfi $do_invalid_TSS |
1da177e4 | 951 | jmp error_code |
fe7cacc1 | 952 | CFI_ENDPROC |
47a55cd7 | 953 | END(invalid_TSS) |
1da177e4 LT |
954 | |
955 | ENTRY(segment_not_present) | |
fe7cacc1 | 956 | RING0_EC_FRAME |
df5d1874 | 957 | pushl_cfi $do_segment_not_present |
1da177e4 | 958 | jmp error_code |
fe7cacc1 | 959 | CFI_ENDPROC |
47a55cd7 | 960 | END(segment_not_present) |
1da177e4 LT |
961 | |
962 | ENTRY(stack_segment) | |
fe7cacc1 | 963 | RING0_EC_FRAME |
df5d1874 | 964 | pushl_cfi $do_stack_segment |
1da177e4 | 965 | jmp error_code |
fe7cacc1 | 966 | CFI_ENDPROC |
47a55cd7 | 967 | END(stack_segment) |
1da177e4 | 968 | |
1da177e4 | 969 | ENTRY(alignment_check) |
fe7cacc1 | 970 | RING0_EC_FRAME |
df5d1874 | 971 | pushl_cfi $do_alignment_check |
1da177e4 | 972 | jmp error_code |
fe7cacc1 | 973 | CFI_ENDPROC |
47a55cd7 | 974 | END(alignment_check) |
1da177e4 | 975 | |
d28c4393 P |
976 | ENTRY(divide_error) |
977 | RING0_INT_FRAME | |
df5d1874 JB |
978 | pushl_cfi $0 # no error code |
979 | pushl_cfi $do_divide_error | |
1da177e4 | 980 | jmp error_code |
fe7cacc1 | 981 | CFI_ENDPROC |
47a55cd7 | 982 | END(divide_error) |
1da177e4 LT |
983 | |
984 | #ifdef CONFIG_X86_MCE | |
985 | ENTRY(machine_check) | |
fe7cacc1 | 986 | RING0_INT_FRAME |
df5d1874 JB |
987 | pushl_cfi $0 |
988 | pushl_cfi machine_check_vector | |
1da177e4 | 989 | jmp error_code |
fe7cacc1 | 990 | CFI_ENDPROC |
47a55cd7 | 991 | END(machine_check) |
1da177e4 LT |
992 | #endif |
993 | ||
994 | ENTRY(spurious_interrupt_bug) | |
fe7cacc1 | 995 | RING0_INT_FRAME |
df5d1874 JB |
996 | pushl_cfi $0 |
997 | pushl_cfi $do_spurious_interrupt_bug | |
1da177e4 | 998 | jmp error_code |
fe7cacc1 | 999 | CFI_ENDPROC |
47a55cd7 | 1000 | END(spurious_interrupt_bug) |
a00e817f MH |
1001 | /* |
1002 | * End of kprobes section | |
1003 | */ | |
1004 | .popsection | |
1da177e4 | 1005 | |
02ba1a32 AK |
1006 | ENTRY(kernel_thread_helper) |
1007 | pushl $0 # fake return address for unwinder | |
1008 | CFI_STARTPROC | |
e840227c BG |
1009 | movl %edi,%eax |
1010 | call *%esi | |
02ba1a32 | 1011 | call do_exit |
5f5db591 | 1012 | ud2 # padding for call trace |
02ba1a32 AK |
1013 | CFI_ENDPROC |
1014 | ENDPROC(kernel_thread_helper) | |
1015 | ||
5ead97c8 | 1016 | #ifdef CONFIG_XEN |
e2a81baf JF |
1017 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
1018 | entrypoint expects, so fix it up before using the normal path. */ | |
1019 | ENTRY(xen_sysenter_target) | |
1020 | RING0_INT_FRAME | |
1021 | addl $5*4, %esp /* remove xen-provided frame */ | |
2ddf9b7b | 1022 | CFI_ADJUST_CFA_OFFSET -5*4 |
e2a81baf | 1023 | jmp sysenter_past_esp |
557d7d4e | 1024 | CFI_ENDPROC |
e2a81baf | 1025 | |
5ead97c8 JF |
1026 | ENTRY(xen_hypervisor_callback) |
1027 | CFI_STARTPROC | |
df5d1874 | 1028 | pushl_cfi $0 |
5ead97c8 JF |
1029 | SAVE_ALL |
1030 | TRACE_IRQS_OFF | |
9ec2b804 JF |
1031 | |
1032 | /* Check to see if we got the event in the critical | |
1033 | region in xen_iret_direct, after we've reenabled | |
1034 | events and checked for pending events. This simulates | |
1035 | iret instruction's behaviour where it delivers a | |
1036 | pending interrupt when enabling interrupts. */ | |
1037 | movl PT_EIP(%esp),%eax | |
1038 | cmpl $xen_iret_start_crit,%eax | |
1039 | jb 1f | |
1040 | cmpl $xen_iret_end_crit,%eax | |
1041 | jae 1f | |
1042 | ||
0f2c8769 | 1043 | jmp xen_iret_crit_fixup |
e2a81baf | 1044 | |
e2a81baf | 1045 | ENTRY(xen_do_upcall) |
b77797fb | 1046 | 1: mov %esp, %eax |
5ead97c8 JF |
1047 | call xen_evtchn_do_upcall |
1048 | jmp ret_from_intr | |
1049 | CFI_ENDPROC | |
1050 | ENDPROC(xen_hypervisor_callback) | |
1051 | ||
1052 | # Hypervisor uses this for application faults while it executes. | |
1053 | # We get here for two reasons: | |
1054 | # 1. Fault while reloading DS, ES, FS or GS | |
1055 | # 2. Fault while executing IRET | |
1056 | # Category 1 we fix up by reattempting the load, and zeroing the segment | |
1057 | # register if the load fails. | |
1058 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the | |
1059 | # normal Linux return path in this case because if we use the IRET hypercall | |
1060 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1061 | # We distinguish between categories by maintaining a status value in EAX. | |
1062 | ENTRY(xen_failsafe_callback) | |
1063 | CFI_STARTPROC | |
df5d1874 | 1064 | pushl_cfi %eax |
5ead97c8 JF |
1065 | movl $1,%eax |
1066 | 1: mov 4(%esp),%ds | |
1067 | 2: mov 8(%esp),%es | |
1068 | 3: mov 12(%esp),%fs | |
1069 | 4: mov 16(%esp),%gs | |
1070 | testl %eax,%eax | |
df5d1874 | 1071 | popl_cfi %eax |
5ead97c8 JF |
1072 | lea 16(%esp),%esp |
1073 | CFI_ADJUST_CFA_OFFSET -16 | |
1074 | jz 5f | |
1075 | addl $16,%esp | |
1076 | jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) | |
df5d1874 | 1077 | 5: pushl_cfi $0 # EAX == 0 => Category 1 (Bad segment) |
5ead97c8 JF |
1078 | SAVE_ALL |
1079 | jmp ret_from_exception | |
1080 | CFI_ENDPROC | |
1081 | ||
1082 | .section .fixup,"ax" | |
1083 | 6: xorl %eax,%eax | |
1084 | movl %eax,4(%esp) | |
1085 | jmp 1b | |
1086 | 7: xorl %eax,%eax | |
1087 | movl %eax,8(%esp) | |
1088 | jmp 2b | |
1089 | 8: xorl %eax,%eax | |
1090 | movl %eax,12(%esp) | |
1091 | jmp 3b | |
1092 | 9: xorl %eax,%eax | |
1093 | movl %eax,16(%esp) | |
1094 | jmp 4b | |
1095 | .previous | |
1096 | .section __ex_table,"a" | |
1097 | .align 4 | |
1098 | .long 1b,6b | |
1099 | .long 2b,7b | |
1100 | .long 3b,8b | |
1101 | .long 4b,9b | |
1102 | .previous | |
1103 | ENDPROC(xen_failsafe_callback) | |
1104 | ||
38e20b07 SY |
1105 | BUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, |
1106 | xen_evtchn_do_upcall) | |
1107 | ||
5ead97c8 JF |
1108 | #endif /* CONFIG_XEN */ |
1109 | ||
606576ce | 1110 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
1111 | #ifdef CONFIG_DYNAMIC_FTRACE |
1112 | ||
1113 | ENTRY(mcount) | |
d61f82d0 SR |
1114 | ret |
1115 | END(mcount) | |
1116 | ||
1117 | ENTRY(ftrace_caller) | |
60a7ecf4 SR |
1118 | cmpl $0, function_trace_stop |
1119 | jne ftrace_stub | |
1120 | ||
d61f82d0 SR |
1121 | pushl %eax |
1122 | pushl %ecx | |
1123 | pushl %edx | |
1124 | movl 0xc(%esp), %eax | |
1125 | movl 0x4(%ebp), %edx | |
395a59d0 | 1126 | subl $MCOUNT_INSN_SIZE, %eax |
d61f82d0 SR |
1127 | |
1128 | .globl ftrace_call | |
1129 | ftrace_call: | |
1130 | call ftrace_stub | |
1131 | ||
1132 | popl %edx | |
1133 | popl %ecx | |
1134 | popl %eax | |
5a45cfe1 SR |
1135 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1136 | .globl ftrace_graph_call | |
1137 | ftrace_graph_call: | |
1138 | jmp ftrace_stub | |
1139 | #endif | |
d61f82d0 SR |
1140 | |
1141 | .globl ftrace_stub | |
1142 | ftrace_stub: | |
1143 | ret | |
1144 | END(ftrace_caller) | |
1145 | ||
1146 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
1147 | ||
16444a8a | 1148 | ENTRY(mcount) |
60a7ecf4 SR |
1149 | cmpl $0, function_trace_stop |
1150 | jne ftrace_stub | |
1151 | ||
16444a8a ACM |
1152 | cmpl $ftrace_stub, ftrace_trace_function |
1153 | jnz trace | |
fb52607a | 1154 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
c2324b69 | 1155 | cmpl $ftrace_stub, ftrace_graph_return |
fb52607a | 1156 | jnz ftrace_graph_caller |
e49dc19c SR |
1157 | |
1158 | cmpl $ftrace_graph_entry_stub, ftrace_graph_entry | |
1159 | jnz ftrace_graph_caller | |
caf4b323 | 1160 | #endif |
16444a8a ACM |
1161 | .globl ftrace_stub |
1162 | ftrace_stub: | |
1163 | ret | |
1164 | ||
1165 | /* taken from glibc */ | |
1166 | trace: | |
1167 | pushl %eax | |
1168 | pushl %ecx | |
1169 | pushl %edx | |
1170 | movl 0xc(%esp), %eax | |
1171 | movl 0x4(%ebp), %edx | |
395a59d0 | 1172 | subl $MCOUNT_INSN_SIZE, %eax |
16444a8a | 1173 | |
d61f82d0 | 1174 | call *ftrace_trace_function |
16444a8a ACM |
1175 | |
1176 | popl %edx | |
1177 | popl %ecx | |
1178 | popl %eax | |
16444a8a ACM |
1179 | jmp ftrace_stub |
1180 | END(mcount) | |
d61f82d0 | 1181 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 1182 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 1183 | |
fb52607a FW |
1184 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1185 | ENTRY(ftrace_graph_caller) | |
e7d3737e FW |
1186 | cmpl $0, function_trace_stop |
1187 | jne ftrace_stub | |
1188 | ||
caf4b323 FW |
1189 | pushl %eax |
1190 | pushl %ecx | |
1191 | pushl %edx | |
1dc1c6ad | 1192 | movl 0xc(%esp), %edx |
caf4b323 | 1193 | lea 0x4(%ebp), %eax |
71e308a2 | 1194 | movl (%ebp), %ecx |
bb4304c7 | 1195 | subl $MCOUNT_INSN_SIZE, %edx |
caf4b323 | 1196 | call prepare_ftrace_return |
caf4b323 FW |
1197 | popl %edx |
1198 | popl %ecx | |
1199 | popl %eax | |
e7d3737e | 1200 | ret |
fb52607a | 1201 | END(ftrace_graph_caller) |
caf4b323 FW |
1202 | |
1203 | .globl return_to_handler | |
1204 | return_to_handler: | |
caf4b323 | 1205 | pushl %eax |
caf4b323 | 1206 | pushl %edx |
71e308a2 | 1207 | movl %ebp, %eax |
caf4b323 | 1208 | call ftrace_return_to_handler |
194ec341 | 1209 | movl %eax, %ecx |
caf4b323 | 1210 | popl %edx |
caf4b323 | 1211 | popl %eax |
194ec341 | 1212 | jmp *%ecx |
e7d3737e | 1213 | #endif |
16444a8a | 1214 | |
d211af05 AH |
1215 | /* |
1216 | * Some functions should be protected against kprobes | |
1217 | */ | |
1218 | .pushsection .kprobes.text, "ax" | |
1219 | ||
1220 | ENTRY(page_fault) | |
1221 | RING0_EC_FRAME | |
df5d1874 | 1222 | pushl_cfi $do_page_fault |
d211af05 AH |
1223 | ALIGN |
1224 | error_code: | |
ccbeed3a | 1225 | /* the function address is in %gs's slot on the stack */ |
df5d1874 | 1226 | pushl_cfi %fs |
ccbeed3a | 1227 | /*CFI_REL_OFFSET fs, 0*/ |
df5d1874 | 1228 | pushl_cfi %es |
d211af05 | 1229 | /*CFI_REL_OFFSET es, 0*/ |
df5d1874 | 1230 | pushl_cfi %ds |
d211af05 | 1231 | /*CFI_REL_OFFSET ds, 0*/ |
df5d1874 | 1232 | pushl_cfi %eax |
d211af05 | 1233 | CFI_REL_OFFSET eax, 0 |
df5d1874 | 1234 | pushl_cfi %ebp |
d211af05 | 1235 | CFI_REL_OFFSET ebp, 0 |
df5d1874 | 1236 | pushl_cfi %edi |
d211af05 | 1237 | CFI_REL_OFFSET edi, 0 |
df5d1874 | 1238 | pushl_cfi %esi |
d211af05 | 1239 | CFI_REL_OFFSET esi, 0 |
df5d1874 | 1240 | pushl_cfi %edx |
d211af05 | 1241 | CFI_REL_OFFSET edx, 0 |
df5d1874 | 1242 | pushl_cfi %ecx |
d211af05 | 1243 | CFI_REL_OFFSET ecx, 0 |
df5d1874 | 1244 | pushl_cfi %ebx |
d211af05 AH |
1245 | CFI_REL_OFFSET ebx, 0 |
1246 | cld | |
d211af05 AH |
1247 | movl $(__KERNEL_PERCPU), %ecx |
1248 | movl %ecx, %fs | |
1249 | UNWIND_ESPFIX_STACK | |
ccbeed3a TH |
1250 | GS_TO_REG %ecx |
1251 | movl PT_GS(%esp), %edi # get the function address | |
d211af05 AH |
1252 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
1253 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart | |
ccbeed3a TH |
1254 | REG_TO_PTGS %ecx |
1255 | SET_KERNEL_GS %ecx | |
d211af05 AH |
1256 | movl $(__USER_DS), %ecx |
1257 | movl %ecx, %ds | |
1258 | movl %ecx, %es | |
1259 | TRACE_IRQS_OFF | |
1260 | movl %esp,%eax # pt_regs pointer | |
1261 | call *%edi | |
1262 | jmp ret_from_exception | |
1263 | CFI_ENDPROC | |
1264 | END(page_fault) | |
1265 | ||
1266 | /* | |
1267 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
1268 | * that sets up the real kernel stack. Check here, since we can't | |
1269 | * allow the wrong stack to be used. | |
1270 | * | |
1271 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have | |
1272 | * already pushed 3 words if it hits on the sysenter instruction: | |
1273 | * eflags, cs and eip. | |
1274 | * | |
1275 | * We just load the right stack, and push the three (known) values | |
1276 | * by hand onto the new stack - while updating the return eip past | |
1277 | * the instruction that would have done it for sysenter. | |
1278 | */ | |
f0d96110 TH |
1279 | .macro FIX_STACK offset ok label |
1280 | cmpw $__KERNEL_CS, 4(%esp) | |
1281 | jne \ok | |
1282 | \label: | |
1283 | movl TSS_sysenter_sp0 + \offset(%esp), %esp | |
1284 | CFI_DEF_CFA esp, 0 | |
1285 | CFI_UNDEFINED eip | |
df5d1874 JB |
1286 | pushfl_cfi |
1287 | pushl_cfi $__KERNEL_CS | |
1288 | pushl_cfi $sysenter_past_esp | |
d211af05 | 1289 | CFI_REL_OFFSET eip, 0 |
f0d96110 | 1290 | .endm |
d211af05 AH |
1291 | |
1292 | ENTRY(debug) | |
1293 | RING0_INT_FRAME | |
1294 | cmpl $ia32_sysenter_target,(%esp) | |
1295 | jne debug_stack_correct | |
f0d96110 | 1296 | FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn |
d211af05 | 1297 | debug_stack_correct: |
df5d1874 | 1298 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1299 | SAVE_ALL |
1300 | TRACE_IRQS_OFF | |
1301 | xorl %edx,%edx # error code 0 | |
1302 | movl %esp,%eax # pt_regs pointer | |
1303 | call do_debug | |
1304 | jmp ret_from_exception | |
1305 | CFI_ENDPROC | |
1306 | END(debug) | |
1307 | ||
1308 | /* | |
1309 | * NMI is doubly nasty. It can happen _while_ we're handling | |
1310 | * a debug fault, and the debug fault hasn't yet been able to | |
1311 | * clear up the stack. So we first check whether we got an | |
1312 | * NMI on the sysenter entry path, but after that we need to | |
1313 | * check whether we got an NMI on the debug path where the debug | |
1314 | * fault happened on the sysenter path. | |
1315 | */ | |
1316 | ENTRY(nmi) | |
1317 | RING0_INT_FRAME | |
df5d1874 | 1318 | pushl_cfi %eax |
d211af05 AH |
1319 | movl %ss, %eax |
1320 | cmpw $__ESPFIX_SS, %ax | |
df5d1874 | 1321 | popl_cfi %eax |
d211af05 AH |
1322 | je nmi_espfix_stack |
1323 | cmpl $ia32_sysenter_target,(%esp) | |
1324 | je nmi_stack_fixup | |
df5d1874 | 1325 | pushl_cfi %eax |
d211af05 AH |
1326 | movl %esp,%eax |
1327 | /* Do not access memory above the end of our stack page, | |
1328 | * it might not exist. | |
1329 | */ | |
1330 | andl $(THREAD_SIZE-1),%eax | |
1331 | cmpl $(THREAD_SIZE-20),%eax | |
df5d1874 | 1332 | popl_cfi %eax |
d211af05 AH |
1333 | jae nmi_stack_correct |
1334 | cmpl $ia32_sysenter_target,12(%esp) | |
1335 | je nmi_debug_stack_check | |
1336 | nmi_stack_correct: | |
1337 | /* We have a RING0_INT_FRAME here */ | |
df5d1874 | 1338 | pushl_cfi %eax |
d211af05 | 1339 | SAVE_ALL |
d211af05 AH |
1340 | xorl %edx,%edx # zero error code |
1341 | movl %esp,%eax # pt_regs pointer | |
1342 | call do_nmi | |
2e04bc76 | 1343 | jmp restore_all_notrace |
d211af05 AH |
1344 | CFI_ENDPROC |
1345 | ||
1346 | nmi_stack_fixup: | |
1347 | RING0_INT_FRAME | |
f0d96110 | 1348 | FIX_STACK 12, nmi_stack_correct, 1 |
d211af05 AH |
1349 | jmp nmi_stack_correct |
1350 | ||
1351 | nmi_debug_stack_check: | |
1352 | /* We have a RING0_INT_FRAME here */ | |
1353 | cmpw $__KERNEL_CS,16(%esp) | |
1354 | jne nmi_stack_correct | |
1355 | cmpl $debug,(%esp) | |
1356 | jb nmi_stack_correct | |
1357 | cmpl $debug_esp_fix_insn,(%esp) | |
1358 | ja nmi_stack_correct | |
f0d96110 | 1359 | FIX_STACK 24, nmi_stack_correct, 1 |
d211af05 AH |
1360 | jmp nmi_stack_correct |
1361 | ||
1362 | nmi_espfix_stack: | |
1363 | /* We have a RING0_INT_FRAME here. | |
1364 | * | |
1365 | * create the pointer to lss back | |
1366 | */ | |
df5d1874 JB |
1367 | pushl_cfi %ss |
1368 | pushl_cfi %esp | |
bda3a897 | 1369 | addl $4, (%esp) |
d211af05 AH |
1370 | /* copy the iret frame of 12 bytes */ |
1371 | .rept 3 | |
df5d1874 | 1372 | pushl_cfi 16(%esp) |
d211af05 | 1373 | .endr |
df5d1874 | 1374 | pushl_cfi %eax |
d211af05 | 1375 | SAVE_ALL |
d211af05 AH |
1376 | FIXUP_ESPFIX_STACK # %eax == %esp |
1377 | xorl %edx,%edx # zero error code | |
1378 | call do_nmi | |
1379 | RESTORE_REGS | |
1380 | lss 12+4(%esp), %esp # back to espfix stack | |
1381 | CFI_ADJUST_CFA_OFFSET -24 | |
1382 | jmp irq_return | |
1383 | CFI_ENDPROC | |
1384 | END(nmi) | |
1385 | ||
1386 | ENTRY(int3) | |
1387 | RING0_INT_FRAME | |
df5d1874 | 1388 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1389 | SAVE_ALL |
1390 | TRACE_IRQS_OFF | |
1391 | xorl %edx,%edx # zero error code | |
1392 | movl %esp,%eax # pt_regs pointer | |
1393 | call do_int3 | |
1394 | jmp ret_from_exception | |
1395 | CFI_ENDPROC | |
1396 | END(int3) | |
1397 | ||
1398 | ENTRY(general_protection) | |
1399 | RING0_EC_FRAME | |
df5d1874 | 1400 | pushl_cfi $do_general_protection |
d211af05 AH |
1401 | jmp error_code |
1402 | CFI_ENDPROC | |
1403 | END(general_protection) | |
1404 | ||
631bc487 GN |
1405 | #ifdef CONFIG_KVM_GUEST |
1406 | ENTRY(async_page_fault) | |
1407 | RING0_EC_FRAME | |
60cf637a | 1408 | pushl_cfi $do_async_page_fault |
631bc487 GN |
1409 | jmp error_code |
1410 | CFI_ENDPROC | |
2ae9d293 | 1411 | END(async_page_fault) |
631bc487 GN |
1412 | #endif |
1413 | ||
d211af05 AH |
1414 | /* |
1415 | * End of kprobes section | |
1416 | */ | |
1417 | .popsection |