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> |
6837a54d | 59 | #include <asm/asm.h> |
e59d1b0a | 60 | #include <asm/smap.h> |
1da177e4 | 61 | |
af0575bb RM |
62 | /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
63 | #include <linux/elf-em.h> | |
64 | #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) | |
65 | #define __AUDIT_ARCH_LE 0x40000000 | |
66 | ||
67 | #ifndef CONFIG_AUDITSYSCALL | |
68 | #define sysenter_audit syscall_trace_entry | |
69 | #define sysexit_audit syscall_exit_work | |
70 | #endif | |
71 | ||
ea714547 JO |
72 | .section .entry.text, "ax" |
73 | ||
139ec7c4 RR |
74 | /* |
75 | * We use macros for low-level operations which need to be overridden | |
76 | * for paravirtualization. The following will never clobber any registers: | |
77 | * INTERRUPT_RETURN (aka. "iret") | |
78 | * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") | |
d75cd22f | 79 | * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). |
139ec7c4 RR |
80 | * |
81 | * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must | |
82 | * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). | |
83 | * Allowing a register to be clobbered can shrink the paravirt replacement | |
84 | * enough to patch inline, increasing performance. | |
85 | */ | |
86 | ||
1da177e4 | 87 | #ifdef CONFIG_PREEMPT |
139ec7c4 | 88 | #define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF |
1da177e4 | 89 | #else |
139ec7c4 | 90 | #define preempt_stop(clobbers) |
2e04bc76 | 91 | #define resume_kernel restore_all |
1da177e4 LT |
92 | #endif |
93 | ||
55f327fa IM |
94 | .macro TRACE_IRQS_IRET |
95 | #ifdef CONFIG_TRACE_IRQFLAGS | |
ab68ed98 | 96 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? |
55f327fa IM |
97 | jz 1f |
98 | TRACE_IRQS_ON | |
99 | 1: | |
100 | #endif | |
101 | .endm | |
102 | ||
ccbeed3a TH |
103 | /* |
104 | * User gs save/restore | |
105 | * | |
106 | * %gs is used for userland TLS and kernel only uses it for stack | |
107 | * canary which is required to be at %gs:20 by gcc. Read the comment | |
108 | * at the top of stackprotector.h for more info. | |
109 | * | |
110 | * Local labels 98 and 99 are used. | |
111 | */ | |
112 | #ifdef CONFIG_X86_32_LAZY_GS | |
113 | ||
114 | /* unfortunately push/pop can't be no-op */ | |
115 | .macro PUSH_GS | |
df5d1874 | 116 | pushl_cfi $0 |
ccbeed3a TH |
117 | .endm |
118 | .macro POP_GS pop=0 | |
119 | addl $(4 + \pop), %esp | |
120 | CFI_ADJUST_CFA_OFFSET -(4 + \pop) | |
121 | .endm | |
122 | .macro POP_GS_EX | |
123 | .endm | |
124 | ||
125 | /* all the rest are no-op */ | |
126 | .macro PTGS_TO_GS | |
127 | .endm | |
128 | .macro PTGS_TO_GS_EX | |
129 | .endm | |
130 | .macro GS_TO_REG reg | |
131 | .endm | |
132 | .macro REG_TO_PTGS reg | |
133 | .endm | |
134 | .macro SET_KERNEL_GS reg | |
135 | .endm | |
136 | ||
137 | #else /* CONFIG_X86_32_LAZY_GS */ | |
138 | ||
139 | .macro PUSH_GS | |
df5d1874 | 140 | pushl_cfi %gs |
ccbeed3a TH |
141 | /*CFI_REL_OFFSET gs, 0*/ |
142 | .endm | |
143 | ||
144 | .macro POP_GS pop=0 | |
df5d1874 | 145 | 98: popl_cfi %gs |
ccbeed3a TH |
146 | /*CFI_RESTORE gs*/ |
147 | .if \pop <> 0 | |
148 | add $\pop, %esp | |
149 | CFI_ADJUST_CFA_OFFSET -\pop | |
150 | .endif | |
151 | .endm | |
152 | .macro POP_GS_EX | |
153 | .pushsection .fixup, "ax" | |
154 | 99: movl $0, (%esp) | |
155 | jmp 98b | |
ccbeed3a | 156 | .popsection |
6837a54d | 157 | _ASM_EXTABLE(98b,99b) |
ccbeed3a TH |
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 | |
ccbeed3a | 167 | .popsection |
6837a54d | 168 | _ASM_EXTABLE(98b,99b) |
ccbeed3a TH |
169 | .endm |
170 | ||
171 | .macro GS_TO_REG reg | |
172 | movl %gs, \reg | |
173 | /*CFI_REGISTER gs, \reg*/ | |
174 | .endm | |
175 | .macro REG_TO_PTGS reg | |
176 | movl \reg, PT_GS(%esp) | |
177 | /*CFI_REL_OFFSET gs, PT_GS*/ | |
178 | .endm | |
179 | .macro SET_KERNEL_GS reg | |
60a5317f | 180 | movl $(__KERNEL_STACK_CANARY), \reg |
ccbeed3a TH |
181 | movl \reg, %gs |
182 | .endm | |
183 | ||
184 | #endif /* CONFIG_X86_32_LAZY_GS */ | |
185 | ||
f0d96110 TH |
186 | .macro SAVE_ALL |
187 | cld | |
ccbeed3a | 188 | PUSH_GS |
df5d1874 | 189 | pushl_cfi %fs |
f0d96110 | 190 | /*CFI_REL_OFFSET fs, 0;*/ |
df5d1874 | 191 | pushl_cfi %es |
f0d96110 | 192 | /*CFI_REL_OFFSET es, 0;*/ |
df5d1874 | 193 | pushl_cfi %ds |
f0d96110 | 194 | /*CFI_REL_OFFSET ds, 0;*/ |
df5d1874 | 195 | pushl_cfi %eax |
f0d96110 | 196 | CFI_REL_OFFSET eax, 0 |
df5d1874 | 197 | pushl_cfi %ebp |
f0d96110 | 198 | CFI_REL_OFFSET ebp, 0 |
df5d1874 | 199 | pushl_cfi %edi |
f0d96110 | 200 | CFI_REL_OFFSET edi, 0 |
df5d1874 | 201 | pushl_cfi %esi |
f0d96110 | 202 | CFI_REL_OFFSET esi, 0 |
df5d1874 | 203 | pushl_cfi %edx |
f0d96110 | 204 | CFI_REL_OFFSET edx, 0 |
df5d1874 | 205 | pushl_cfi %ecx |
f0d96110 | 206 | CFI_REL_OFFSET ecx, 0 |
df5d1874 | 207 | pushl_cfi %ebx |
f0d96110 TH |
208 | CFI_REL_OFFSET ebx, 0 |
209 | movl $(__USER_DS), %edx | |
210 | movl %edx, %ds | |
211 | movl %edx, %es | |
212 | movl $(__KERNEL_PERCPU), %edx | |
464d1a78 | 213 | movl %edx, %fs |
ccbeed3a | 214 | SET_KERNEL_GS %edx |
f0d96110 | 215 | .endm |
1da177e4 | 216 | |
f0d96110 | 217 | .macro RESTORE_INT_REGS |
df5d1874 | 218 | popl_cfi %ebx |
f0d96110 | 219 | CFI_RESTORE ebx |
df5d1874 | 220 | popl_cfi %ecx |
f0d96110 | 221 | CFI_RESTORE ecx |
df5d1874 | 222 | popl_cfi %edx |
f0d96110 | 223 | CFI_RESTORE edx |
df5d1874 | 224 | popl_cfi %esi |
f0d96110 | 225 | CFI_RESTORE esi |
df5d1874 | 226 | popl_cfi %edi |
f0d96110 | 227 | CFI_RESTORE edi |
df5d1874 | 228 | popl_cfi %ebp |
f0d96110 | 229 | CFI_RESTORE ebp |
df5d1874 | 230 | popl_cfi %eax |
fe7cacc1 | 231 | CFI_RESTORE eax |
f0d96110 | 232 | .endm |
1da177e4 | 233 | |
ccbeed3a | 234 | .macro RESTORE_REGS pop=0 |
f0d96110 | 235 | RESTORE_INT_REGS |
df5d1874 | 236 | 1: popl_cfi %ds |
f0d96110 | 237 | /*CFI_RESTORE ds;*/ |
df5d1874 | 238 | 2: popl_cfi %es |
f0d96110 | 239 | /*CFI_RESTORE es;*/ |
df5d1874 | 240 | 3: popl_cfi %fs |
f0d96110 | 241 | /*CFI_RESTORE fs;*/ |
ccbeed3a | 242 | POP_GS \pop |
f0d96110 TH |
243 | .pushsection .fixup, "ax" |
244 | 4: movl $0, (%esp) | |
245 | jmp 1b | |
246 | 5: movl $0, (%esp) | |
247 | jmp 2b | |
248 | 6: movl $0, (%esp) | |
249 | jmp 3b | |
f95d47ca | 250 | .popsection |
6837a54d PA |
251 | _ASM_EXTABLE(1b,4b) |
252 | _ASM_EXTABLE(2b,5b) | |
253 | _ASM_EXTABLE(3b,6b) | |
ccbeed3a | 254 | POP_GS_EX |
f0d96110 | 255 | .endm |
1da177e4 | 256 | |
f0d96110 TH |
257 | .macro RING0_INT_FRAME |
258 | CFI_STARTPROC simple | |
259 | CFI_SIGNAL_FRAME | |
260 | CFI_DEF_CFA esp, 3*4 | |
261 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 262 | CFI_OFFSET eip, -3*4 |
f0d96110 | 263 | .endm |
fe7cacc1 | 264 | |
f0d96110 TH |
265 | .macro RING0_EC_FRAME |
266 | CFI_STARTPROC simple | |
267 | CFI_SIGNAL_FRAME | |
268 | CFI_DEF_CFA esp, 4*4 | |
269 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 270 | CFI_OFFSET eip, -3*4 |
f0d96110 | 271 | .endm |
fe7cacc1 | 272 | |
f0d96110 TH |
273 | .macro RING0_PTREGS_FRAME |
274 | CFI_STARTPROC simple | |
275 | CFI_SIGNAL_FRAME | |
276 | CFI_DEF_CFA esp, PT_OLDESP-PT_EBX | |
277 | /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ | |
278 | CFI_OFFSET eip, PT_EIP-PT_OLDESP | |
279 | /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ | |
280 | /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ | |
281 | CFI_OFFSET eax, PT_EAX-PT_OLDESP | |
282 | CFI_OFFSET ebp, PT_EBP-PT_OLDESP | |
283 | CFI_OFFSET edi, PT_EDI-PT_OLDESP | |
284 | CFI_OFFSET esi, PT_ESI-PT_OLDESP | |
285 | CFI_OFFSET edx, PT_EDX-PT_OLDESP | |
286 | CFI_OFFSET ecx, PT_ECX-PT_OLDESP | |
eb5b7b9d | 287 | CFI_OFFSET ebx, PT_EBX-PT_OLDESP |
f0d96110 | 288 | .endm |
1da177e4 LT |
289 | |
290 | ENTRY(ret_from_fork) | |
fe7cacc1 | 291 | CFI_STARTPROC |
df5d1874 | 292 | pushl_cfi %eax |
1da177e4 LT |
293 | call schedule_tail |
294 | GET_THREAD_INFO(%ebp) | |
df5d1874 JB |
295 | popl_cfi %eax |
296 | pushl_cfi $0x0202 # Reset kernel eflags | |
297 | popfl_cfi | |
1da177e4 | 298 | jmp syscall_exit |
fe7cacc1 | 299 | CFI_ENDPROC |
47a55cd7 | 300 | END(ret_from_fork) |
1da177e4 | 301 | |
22e2430d AV |
302 | ENTRY(ret_from_kernel_thread) |
303 | CFI_STARTPROC | |
304 | pushl_cfi %eax | |
305 | call schedule_tail | |
6783eaa2 | 306 | GET_THREAD_INFO(%ebp) |
22e2430d AV |
307 | popl_cfi %eax |
308 | pushl_cfi $0x0202 # Reset kernel eflags | |
309 | popfl_cfi | |
310 | movl PT_EBP(%esp),%eax | |
311 | call *PT_EBX(%esp) | |
312 | movl $0,PT_EAX(%esp) | |
6783eaa2 | 313 | jmp syscall_exit |
22e2430d AV |
314 | CFI_ENDPROC |
315 | ENDPROC(ret_from_kernel_thread) | |
6783eaa2 | 316 | |
1da177e4 LT |
317 | /* |
318 | * Return to user mode is not as complex as all this looks, | |
319 | * but we want the default path for a system call return to | |
320 | * go as quickly as possible which is why some of this is | |
321 | * less clear than it otherwise should be. | |
322 | */ | |
323 | ||
324 | # userspace resumption stub bypassing syscall exit tracing | |
325 | ALIGN | |
fe7cacc1 | 326 | RING0_PTREGS_FRAME |
1da177e4 | 327 | ret_from_exception: |
139ec7c4 | 328 | preempt_stop(CLBR_ANY) |
1da177e4 LT |
329 | ret_from_intr: |
330 | GET_THREAD_INFO(%ebp) | |
29a2e283 | 331 | #ifdef CONFIG_VM86 |
eb5b7b9d JF |
332 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
333 | movb PT_CS(%esp), %al | |
ab68ed98 | 334 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
29a2e283 DA |
335 | #else |
336 | /* | |
6783eaa2 | 337 | * We can be coming here from child spawned by kernel_thread(). |
29a2e283 DA |
338 | */ |
339 | movl PT_CS(%esp), %eax | |
340 | andl $SEGMENT_RPL_MASK, %eax | |
341 | #endif | |
78be3706 RR |
342 | cmpl $USER_RPL, %eax |
343 | jb resume_kernel # not returning to v8086 or userspace | |
f95d47ca | 344 | |
1da177e4 | 345 | ENTRY(resume_userspace) |
c7e872e7 | 346 | LOCKDEP_SYS_EXIT |
139ec7c4 | 347 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
348 | # setting need_resched or sigpending |
349 | # between sampling and the iret | |
e32e58a9 | 350 | TRACE_IRQS_OFF |
1da177e4 LT |
351 | movl TI_flags(%ebp), %ecx |
352 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
353 | # int/exception return? | |
354 | jne work_pending | |
355 | jmp restore_all | |
47a55cd7 | 356 | END(ret_from_exception) |
1da177e4 LT |
357 | |
358 | #ifdef CONFIG_PREEMPT | |
359 | ENTRY(resume_kernel) | |
139ec7c4 | 360 | DISABLE_INTERRUPTS(CLBR_ANY) |
1da177e4 | 361 | need_resched: |
c2daa3be PZ |
362 | cmpl $0,PER_CPU_VAR(__preempt_count) |
363 | jnz restore_all | |
ab68ed98 | 364 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
1da177e4 LT |
365 | jz restore_all |
366 | call preempt_schedule_irq | |
367 | jmp need_resched | |
47a55cd7 | 368 | END(resume_kernel) |
1da177e4 | 369 | #endif |
fe7cacc1 | 370 | CFI_ENDPROC |
1da177e4 LT |
371 | |
372 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
373 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
374 | ||
375 | # sysenter call handler stub | |
0aa97fb2 | 376 | ENTRY(ia32_sysenter_target) |
fe7cacc1 | 377 | CFI_STARTPROC simple |
adf14236 | 378 | CFI_SIGNAL_FRAME |
fe7cacc1 JB |
379 | CFI_DEF_CFA esp, 0 |
380 | CFI_REGISTER esp, ebp | |
faca6227 | 381 | movl TSS_sysenter_sp0(%esp),%esp |
1da177e4 | 382 | sysenter_past_esp: |
55f327fa | 383 | /* |
d93c870b JF |
384 | * Interrupts are disabled here, but we can't trace it until |
385 | * enough kernel state to call TRACE_IRQS_OFF can be called - but | |
386 | * we immediately enable interrupts at that point anyway. | |
55f327fa | 387 | */ |
3234282f | 388 | pushl_cfi $__USER_DS |
fe7cacc1 | 389 | /*CFI_REL_OFFSET ss, 0*/ |
df5d1874 | 390 | pushl_cfi %ebp |
fe7cacc1 | 391 | CFI_REL_OFFSET esp, 0 |
df5d1874 | 392 | pushfl_cfi |
d93c870b | 393 | orl $X86_EFLAGS_IF, (%esp) |
3234282f | 394 | pushl_cfi $__USER_CS |
fe7cacc1 | 395 | /*CFI_REL_OFFSET cs, 0*/ |
e6e5494c IM |
396 | /* |
397 | * Push current_thread_info()->sysenter_return to the stack. | |
ff8287f3 AL |
398 | * A tiny bit of offset fixup is necessary: TI_sysenter_return |
399 | * is relative to thread_info, which is at the bottom of the | |
400 | * kernel stack page. 4*4 means the 4 words pushed above; | |
401 | * TOP_OF_KERNEL_STACK_PADDING takes us to the top of the stack; | |
402 | * and THREAD_SIZE takes us to the bottom. | |
e6e5494c | 403 | */ |
ff8287f3 | 404 | pushl_cfi ((TI_sysenter_return) - THREAD_SIZE + TOP_OF_KERNEL_STACK_PADDING + 4*4)(%esp) |
fe7cacc1 | 405 | CFI_REL_OFFSET eip, 0 |
1da177e4 | 406 | |
df5d1874 | 407 | pushl_cfi %eax |
d93c870b JF |
408 | SAVE_ALL |
409 | ENABLE_INTERRUPTS(CLBR_NONE) | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * Load the potential sixth argument from user stack. | |
413 | * Careful about security. | |
414 | */ | |
415 | cmpl $__PAGE_OFFSET-3,%ebp | |
416 | jae syscall_fault | |
e59d1b0a | 417 | ASM_STAC |
1da177e4 | 418 | 1: movl (%ebp),%ebp |
e59d1b0a | 419 | ASM_CLAC |
d93c870b | 420 | movl %ebp,PT_EBP(%esp) |
6837a54d | 421 | _ASM_EXTABLE(1b,syscall_fault) |
1da177e4 | 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 |
554086d8 | 429 | jae sysenter_badsys |
1da177e4 | 430 | call *sys_call_table(,%eax,4) |
554086d8 | 431 | sysenter_after_call: |
8142b215 | 432 | movl %eax,PT_EAX(%esp) |
c7e872e7 | 433 | LOCKDEP_SYS_EXIT |
42c24fa2 | 434 | DISABLE_INTERRUPTS(CLBR_ANY) |
55f327fa | 435 | TRACE_IRQS_OFF |
1da177e4 | 436 | movl TI_flags(%ebp), %ecx |
88200bc2 | 437 | testl $_TIF_ALLWORK_MASK, %ecx |
54cfa458 | 438 | jnz sysexit_audit |
af0575bb | 439 | sysenter_exit: |
1da177e4 | 440 | /* if something modifies registers it must also disable sysexit */ |
eb5b7b9d JF |
441 | movl PT_EIP(%esp), %edx |
442 | movl PT_OLDESP(%esp), %ecx | |
1da177e4 | 443 | xorl %ebp,%ebp |
55f327fa | 444 | TRACE_IRQS_ON |
464d1a78 | 445 | 1: mov PT_FS(%esp), %fs |
ccbeed3a | 446 | PTGS_TO_GS |
d75cd22f | 447 | ENABLE_INTERRUPTS_SYSEXIT |
af0575bb RM |
448 | |
449 | #ifdef CONFIG_AUDITSYSCALL | |
450 | sysenter_audit: | |
88200bc2 | 451 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
af0575bb | 452 | jnz syscall_trace_entry |
26c2d2b3 EP |
453 | /* movl PT_EAX(%esp), %eax already set, syscall number: 1st arg to audit */ |
454 | movl PT_EBX(%esp), %edx /* ebx/a0: 2nd arg to audit */ | |
455 | /* movl PT_ECX(%esp), %ecx already set, a1: 3nd arg to audit */ | |
456 | pushl_cfi PT_ESI(%esp) /* a3: 5th arg */ | |
457 | pushl_cfi PT_EDX+4(%esp) /* a2: 4th arg */ | |
b05d8447 | 458 | call __audit_syscall_entry |
26c2d2b3 EP |
459 | popl_cfi %ecx /* get that remapped edx off the stack */ |
460 | popl_cfi %ecx /* get that remapped esi off the stack */ | |
af0575bb RM |
461 | movl PT_EAX(%esp),%eax /* reload syscall number */ |
462 | jmp sysenter_do_call | |
463 | ||
464 | sysexit_audit: | |
88200bc2 | 465 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
54cfa458 | 466 | jnz syscall_exit_work |
af0575bb RM |
467 | TRACE_IRQS_ON |
468 | ENABLE_INTERRUPTS(CLBR_ANY) | |
469 | movl %eax,%edx /* second arg, syscall return value */ | |
d7e7528b EP |
470 | cmpl $-MAX_ERRNO,%eax /* is it an error ? */ |
471 | setbe %al /* 1 if so, 0 if not */ | |
af0575bb | 472 | movzbl %al,%eax /* zero-extend that */ |
d7e7528b | 473 | call __audit_syscall_exit |
af0575bb RM |
474 | DISABLE_INTERRUPTS(CLBR_ANY) |
475 | TRACE_IRQS_OFF | |
476 | movl TI_flags(%ebp), %ecx | |
88200bc2 | 477 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
54cfa458 | 478 | jnz syscall_exit_work |
af0575bb RM |
479 | movl PT_EAX(%esp),%eax /* reload syscall return value */ |
480 | jmp sysenter_exit | |
481 | #endif | |
482 | ||
fe7cacc1 | 483 | CFI_ENDPROC |
f95d47ca | 484 | .pushsection .fixup,"ax" |
464d1a78 | 485 | 2: movl $0,PT_FS(%esp) |
f95d47ca | 486 | jmp 1b |
f95d47ca | 487 | .popsection |
6837a54d | 488 | _ASM_EXTABLE(1b,2b) |
ccbeed3a | 489 | PTGS_TO_GS_EX |
0aa97fb2 | 490 | ENDPROC(ia32_sysenter_target) |
1da177e4 LT |
491 | |
492 | # system call handler stub | |
493 | ENTRY(system_call) | |
fe7cacc1 | 494 | RING0_INT_FRAME # can't unwind into user space anyway |
e59d1b0a | 495 | ASM_CLAC |
df5d1874 | 496 | pushl_cfi %eax # save orig_eax |
1da177e4 LT |
497 | SAVE_ALL |
498 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 499 | # system call tracing in operation / emulation |
88200bc2 | 500 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
1da177e4 | 501 | jnz syscall_trace_entry |
303395ac | 502 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
503 | jae syscall_badsys |
504 | syscall_call: | |
505 | call *sys_call_table(,%eax,4) | |
8142b215 | 506 | syscall_after_call: |
eb5b7b9d | 507 | movl %eax,PT_EAX(%esp) # store the return value |
1da177e4 | 508 | syscall_exit: |
c7e872e7 | 509 | LOCKDEP_SYS_EXIT |
139ec7c4 | 510 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
511 | # setting need_resched or sigpending |
512 | # between sampling and the iret | |
55f327fa | 513 | TRACE_IRQS_OFF |
1da177e4 | 514 | movl TI_flags(%ebp), %ecx |
88200bc2 | 515 | testl $_TIF_ALLWORK_MASK, %ecx # current->work |
54cfa458 | 516 | jnz syscall_exit_work |
1da177e4 LT |
517 | |
518 | restore_all: | |
2e04bc76 AH |
519 | TRACE_IRQS_IRET |
520 | restore_all_notrace: | |
34273f41 | 521 | #ifdef CONFIG_X86_ESPFIX32 |
eb5b7b9d JF |
522 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
523 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we | |
5df24082 SS |
524 | # are returning to the kernel. |
525 | # See comments in process.c:copy_thread() for details. | |
eb5b7b9d JF |
526 | movb PT_OLDSS(%esp), %ah |
527 | movb PT_CS(%esp), %al | |
ab68ed98 | 528 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
78be3706 | 529 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
fe7cacc1 | 530 | CFI_REMEMBER_STATE |
1da177e4 | 531 | je ldt_ss # returning to user-space with LDT SS |
34273f41 | 532 | #endif |
1da177e4 | 533 | restore_nocheck: |
ccbeed3a | 534 | RESTORE_REGS 4 # skip orig_eax/error_code |
f7f3d791 | 535 | irq_return: |
3701d863 | 536 | INTERRUPT_RETURN |
1da177e4 | 537 | .section .fixup,"ax" |
90e9f536 | 538 | ENTRY(iret_exc) |
a879cbbb LT |
539 | pushl $0 # no error code |
540 | pushl $do_iret_error | |
541 | jmp error_code | |
1da177e4 | 542 | .previous |
6837a54d | 543 | _ASM_EXTABLE(irq_return,iret_exc) |
1da177e4 | 544 | |
34273f41 | 545 | #ifdef CONFIG_X86_ESPFIX32 |
fe7cacc1 | 546 | CFI_RESTORE_STATE |
1da177e4 | 547 | ldt_ss: |
d3561b7f RR |
548 | #ifdef CONFIG_PARAVIRT |
549 | /* | |
550 | * The kernel can't run on a non-flat stack if paravirt mode | |
551 | * is active. Rather than try to fixup the high bits of | |
552 | * ESP, bypass this code entirely. This may break DOSemu | |
553 | * and/or Wine support in a paravirt VM, although the option | |
554 | * is still available to implement the setting of the high | |
555 | * 16-bits in the INTERRUPT_RETURN paravirt-op. | |
556 | */ | |
93b1eab3 | 557 | cmpl $0, pv_info+PARAVIRT_enabled |
d3561b7f RR |
558 | jne restore_nocheck |
559 | #endif | |
560 | ||
dc4c2a0a AH |
561 | /* |
562 | * Setup and switch to ESPFIX stack | |
563 | * | |
564 | * We're returning to userspace with a 16 bit stack. The CPU will not | |
565 | * restore the high word of ESP for us on executing iret... This is an | |
566 | * "official" bug of all the x86-compatible CPUs, which we can work | |
567 | * around to make dosemu and wine happy. We do this by preloading the | |
568 | * high word of ESP with the high word of the userspace ESP while | |
569 | * compensating for the offset by changing to the ESPFIX segment with | |
570 | * a base address that matches for the difference. | |
571 | */ | |
72c511dd | 572 | #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) |
dc4c2a0a AH |
573 | mov %esp, %edx /* load kernel esp */ |
574 | mov PT_OLDESP(%esp), %eax /* load userspace esp */ | |
575 | mov %dx, %ax /* eax: new kernel esp */ | |
576 | sub %eax, %edx /* offset (low word is 0) */ | |
dc4c2a0a | 577 | shr $16, %edx |
72c511dd BG |
578 | mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ |
579 | mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ | |
df5d1874 JB |
580 | pushl_cfi $__ESPFIX_SS |
581 | pushl_cfi %eax /* new kernel esp */ | |
2e04bc76 AH |
582 | /* Disable interrupts, but do not irqtrace this section: we |
583 | * will soon execute iret and the tracer was already set to | |
584 | * the irqstate after the iret */ | |
139ec7c4 | 585 | DISABLE_INTERRUPTS(CLBR_EAX) |
dc4c2a0a | 586 | lss (%esp), %esp /* switch to espfix segment */ |
be44d2aa SS |
587 | CFI_ADJUST_CFA_OFFSET -8 |
588 | jmp restore_nocheck | |
34273f41 | 589 | #endif |
fe7cacc1 | 590 | CFI_ENDPROC |
47a55cd7 | 591 | ENDPROC(system_call) |
1da177e4 LT |
592 | |
593 | # perform work that needs to be done immediately before resumption | |
594 | ALIGN | |
fe7cacc1 | 595 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
1da177e4 LT |
596 | work_pending: |
597 | testb $_TIF_NEED_RESCHED, %cl | |
598 | jz work_notifysig | |
599 | work_resched: | |
600 | call schedule | |
c7e872e7 | 601 | LOCKDEP_SYS_EXIT |
139ec7c4 | 602 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
603 | # setting need_resched or sigpending |
604 | # between sampling and the iret | |
55f327fa | 605 | TRACE_IRQS_OFF |
1da177e4 LT |
606 | movl TI_flags(%ebp), %ecx |
607 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
608 | # than syscall tracing? | |
609 | jz restore_all | |
610 | testb $_TIF_NEED_RESCHED, %cl | |
611 | jnz work_resched | |
612 | ||
613 | work_notifysig: # deal with pending signals and | |
614 | # notify-resume requests | |
74b47a78 | 615 | #ifdef CONFIG_VM86 |
ab68ed98 | 616 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
1da177e4 | 617 | movl %esp, %eax |
54cfa458 | 618 | jnz work_notifysig_v86 # returning to kernel-space or |
1da177e4 | 619 | # vm86-space |
969ae0bf AV |
620 | 1: |
621 | #else | |
622 | movl %esp, %eax | |
623 | #endif | |
3596ff4e SD |
624 | TRACE_IRQS_ON |
625 | ENABLE_INTERRUPTS(CLBR_NONE) | |
44fbbb3d AV |
626 | movb PT_CS(%esp), %bl |
627 | andb $SEGMENT_RPL_MASK, %bl | |
628 | cmpb $USER_RPL, %bl | |
629 | jb resume_kernel | |
1da177e4 LT |
630 | xorl %edx, %edx |
631 | call do_notify_resume | |
44fbbb3d | 632 | jmp resume_userspace |
1da177e4 | 633 | |
969ae0bf | 634 | #ifdef CONFIG_VM86 |
1da177e4 LT |
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 |
969ae0bf | 641 | jmp 1b |
74b47a78 | 642 | #endif |
47a55cd7 | 643 | END(work_pending) |
1da177e4 LT |
644 | |
645 | # perform syscall exit tracing | |
646 | ALIGN | |
647 | syscall_trace_entry: | |
eb5b7b9d | 648 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 649 | movl %esp, %eax |
d4d67150 RM |
650 | call syscall_trace_enter |
651 | /* What it returned is what we'll actually use. */ | |
303395ac | 652 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
653 | jnae syscall_call |
654 | jmp syscall_exit | |
47a55cd7 | 655 | END(syscall_trace_entry) |
1da177e4 LT |
656 | |
657 | # perform syscall exit tracing | |
658 | ALIGN | |
659 | syscall_exit_work: | |
88200bc2 | 660 | testl $_TIF_WORK_SYSCALL_EXIT, %ecx |
1da177e4 | 661 | jz work_pending |
55f327fa | 662 | TRACE_IRQS_ON |
d4d67150 | 663 | ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call |
1da177e4 LT |
664 | # schedule() instead |
665 | movl %esp, %eax | |
d4d67150 | 666 | call syscall_trace_leave |
1da177e4 | 667 | jmp resume_userspace |
47a55cd7 | 668 | END(syscall_exit_work) |
fe7cacc1 | 669 | CFI_ENDPROC |
1da177e4 | 670 | |
fe7cacc1 | 671 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 672 | syscall_fault: |
e59d1b0a | 673 | ASM_CLAC |
1da177e4 | 674 | GET_THREAD_INFO(%ebp) |
eb5b7b9d | 675 | movl $-EFAULT,PT_EAX(%esp) |
1da177e4 | 676 | jmp resume_userspace |
47a55cd7 | 677 | END(syscall_fault) |
1da177e4 | 678 | |
1da177e4 | 679 | syscall_badsys: |
8142b215 SW |
680 | movl $-ENOSYS,%eax |
681 | jmp syscall_after_call | |
554086d8 AL |
682 | END(syscall_badsys) |
683 | ||
684 | sysenter_badsys: | |
8142b215 | 685 | movl $-ENOSYS,%eax |
554086d8 | 686 | jmp sysenter_after_call |
fb21b84e | 687 | END(sysenter_badsys) |
fe7cacc1 | 688 | CFI_ENDPROC |
1da177e4 | 689 | |
f0d96110 | 690 | .macro FIXUP_ESPFIX_STACK |
dc4c2a0a AH |
691 | /* |
692 | * Switch back for ESPFIX stack to the normal zerobased stack | |
693 | * | |
694 | * We can't call C functions using the ESPFIX stack. This code reads | |
695 | * the high word of the segment base from the GDT and swiches to the | |
696 | * normal stack and adjusts ESP with the matching offset. | |
697 | */ | |
34273f41 | 698 | #ifdef CONFIG_X86_ESPFIX32 |
dc4c2a0a | 699 | /* fixup the stack */ |
72c511dd BG |
700 | mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ |
701 | mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ | |
dc4c2a0a AH |
702 | shl $16, %eax |
703 | addl %esp, %eax /* the adjusted stack pointer */ | |
df5d1874 JB |
704 | pushl_cfi $__KERNEL_DS |
705 | pushl_cfi %eax | |
dc4c2a0a | 706 | lss (%esp), %esp /* switch to the normal stack segment */ |
f0d96110 | 707 | CFI_ADJUST_CFA_OFFSET -8 |
34273f41 | 708 | #endif |
f0d96110 TH |
709 | .endm |
710 | .macro UNWIND_ESPFIX_STACK | |
34273f41 | 711 | #ifdef CONFIG_X86_ESPFIX32 |
f0d96110 TH |
712 | movl %ss, %eax |
713 | /* see if on espfix stack */ | |
714 | cmpw $__ESPFIX_SS, %ax | |
715 | jne 27f | |
716 | movl $__KERNEL_DS, %eax | |
717 | movl %eax, %ds | |
718 | movl %eax, %es | |
719 | /* switch to normal stack */ | |
720 | FIXUP_ESPFIX_STACK | |
721 | 27: | |
34273f41 | 722 | #endif |
f0d96110 | 723 | .endm |
1da177e4 LT |
724 | |
725 | /* | |
3304c9c3 DV |
726 | * Build the entry stubs with some assembler magic. |
727 | * We pack 1 stub into every 8-byte block. | |
1da177e4 | 728 | */ |
3304c9c3 | 729 | .align 8 |
1da177e4 | 730 | ENTRY(irq_entries_start) |
fe7cacc1 | 731 | RING0_INT_FRAME |
3304c9c3 DV |
732 | vector=FIRST_EXTERNAL_VECTOR |
733 | .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR) | |
734 | pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ | |
735 | vector=vector+1 | |
736 | jmp common_interrupt | |
fe7cacc1 | 737 | CFI_ADJUST_CFA_OFFSET -4 |
3304c9c3 DV |
738 | .align 8 |
739 | .endr | |
47a55cd7 JB |
740 | END(irq_entries_start) |
741 | ||
55f327fa IM |
742 | /* |
743 | * the CPU automatically disables interrupts when executing an IRQ vector, | |
744 | * so IRQ-flags tracing has to follow that: | |
745 | */ | |
b7c6244f | 746 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
1da177e4 | 747 | common_interrupt: |
e59d1b0a | 748 | ASM_CLAC |
b7c6244f | 749 | addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ |
1da177e4 | 750 | SAVE_ALL |
55f327fa | 751 | TRACE_IRQS_OFF |
1da177e4 LT |
752 | movl %esp,%eax |
753 | call do_IRQ | |
754 | jmp ret_from_intr | |
47a55cd7 | 755 | ENDPROC(common_interrupt) |
fe7cacc1 | 756 | CFI_ENDPROC |
1da177e4 | 757 | |
02cf94c3 | 758 | #define BUILD_INTERRUPT3(name, nr, fn) \ |
1da177e4 | 759 | ENTRY(name) \ |
fe7cacc1 | 760 | RING0_INT_FRAME; \ |
e59d1b0a | 761 | ASM_CLAC; \ |
df5d1874 | 762 | pushl_cfi $~(nr); \ |
fe7cacc1 | 763 | SAVE_ALL; \ |
55f327fa | 764 | TRACE_IRQS_OFF \ |
1da177e4 | 765 | movl %esp,%eax; \ |
02cf94c3 | 766 | call fn; \ |
55f327fa | 767 | jmp ret_from_intr; \ |
47a55cd7 JB |
768 | CFI_ENDPROC; \ |
769 | ENDPROC(name) | |
1da177e4 | 770 | |
cf910e83 SA |
771 | |
772 | #ifdef CONFIG_TRACING | |
773 | #define TRACE_BUILD_INTERRUPT(name, nr) \ | |
774 | BUILD_INTERRUPT3(trace_##name, nr, smp_trace_##name) | |
775 | #else | |
776 | #define TRACE_BUILD_INTERRUPT(name, nr) | |
777 | #endif | |
778 | ||
779 | #define BUILD_INTERRUPT(name, nr) \ | |
780 | BUILD_INTERRUPT3(name, nr, smp_##name); \ | |
781 | TRACE_BUILD_INTERRUPT(name, nr) | |
02cf94c3 | 782 | |
1da177e4 | 783 | /* The include is where all of the SMP etc. interrupts come from */ |
1164dd00 | 784 | #include <asm/entry_arch.h> |
1da177e4 | 785 | |
1da177e4 | 786 | ENTRY(coprocessor_error) |
fe7cacc1 | 787 | RING0_INT_FRAME |
e59d1b0a | 788 | ASM_CLAC |
df5d1874 JB |
789 | pushl_cfi $0 |
790 | pushl_cfi $do_coprocessor_error | |
1da177e4 | 791 | jmp error_code |
fe7cacc1 | 792 | CFI_ENDPROC |
47a55cd7 | 793 | END(coprocessor_error) |
1da177e4 LT |
794 | |
795 | ENTRY(simd_coprocessor_error) | |
fe7cacc1 | 796 | RING0_INT_FRAME |
e59d1b0a | 797 | ASM_CLAC |
df5d1874 | 798 | pushl_cfi $0 |
40d2e763 BG |
799 | #ifdef CONFIG_X86_INVD_BUG |
800 | /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ | |
8e65f6e0 BP |
801 | ALTERNATIVE "pushl_cfi $do_general_protection", \ |
802 | "pushl $do_simd_coprocessor_error", \ | |
803 | X86_FEATURE_XMM | |
40d2e763 | 804 | #else |
df5d1874 | 805 | pushl_cfi $do_simd_coprocessor_error |
40d2e763 | 806 | #endif |
1da177e4 | 807 | jmp error_code |
fe7cacc1 | 808 | CFI_ENDPROC |
47a55cd7 | 809 | END(simd_coprocessor_error) |
1da177e4 LT |
810 | |
811 | ENTRY(device_not_available) | |
fe7cacc1 | 812 | RING0_INT_FRAME |
e59d1b0a | 813 | ASM_CLAC |
df5d1874 JB |
814 | pushl_cfi $-1 # mark this as an int |
815 | pushl_cfi $do_device_not_available | |
7643e9b9 | 816 | jmp error_code |
fe7cacc1 | 817 | CFI_ENDPROC |
47a55cd7 | 818 | END(device_not_available) |
1da177e4 | 819 | |
d3561b7f RR |
820 | #ifdef CONFIG_PARAVIRT |
821 | ENTRY(native_iret) | |
3701d863 | 822 | iret |
6837a54d | 823 | _ASM_EXTABLE(native_iret, iret_exc) |
47a55cd7 | 824 | END(native_iret) |
d3561b7f | 825 | |
d75cd22f | 826 | ENTRY(native_irq_enable_sysexit) |
d3561b7f RR |
827 | sti |
828 | sysexit | |
d75cd22f | 829 | END(native_irq_enable_sysexit) |
d3561b7f RR |
830 | #endif |
831 | ||
1da177e4 | 832 | ENTRY(overflow) |
fe7cacc1 | 833 | RING0_INT_FRAME |
e59d1b0a | 834 | ASM_CLAC |
df5d1874 JB |
835 | pushl_cfi $0 |
836 | pushl_cfi $do_overflow | |
1da177e4 | 837 | jmp error_code |
fe7cacc1 | 838 | CFI_ENDPROC |
47a55cd7 | 839 | END(overflow) |
1da177e4 LT |
840 | |
841 | ENTRY(bounds) | |
fe7cacc1 | 842 | RING0_INT_FRAME |
e59d1b0a | 843 | ASM_CLAC |
df5d1874 JB |
844 | pushl_cfi $0 |
845 | pushl_cfi $do_bounds | |
1da177e4 | 846 | jmp error_code |
fe7cacc1 | 847 | CFI_ENDPROC |
47a55cd7 | 848 | END(bounds) |
1da177e4 LT |
849 | |
850 | ENTRY(invalid_op) | |
fe7cacc1 | 851 | RING0_INT_FRAME |
e59d1b0a | 852 | ASM_CLAC |
df5d1874 JB |
853 | pushl_cfi $0 |
854 | pushl_cfi $do_invalid_op | |
1da177e4 | 855 | jmp error_code |
fe7cacc1 | 856 | CFI_ENDPROC |
47a55cd7 | 857 | END(invalid_op) |
1da177e4 LT |
858 | |
859 | ENTRY(coprocessor_segment_overrun) | |
fe7cacc1 | 860 | RING0_INT_FRAME |
e59d1b0a | 861 | ASM_CLAC |
df5d1874 JB |
862 | pushl_cfi $0 |
863 | pushl_cfi $do_coprocessor_segment_overrun | |
1da177e4 | 864 | jmp error_code |
fe7cacc1 | 865 | CFI_ENDPROC |
47a55cd7 | 866 | END(coprocessor_segment_overrun) |
1da177e4 LT |
867 | |
868 | ENTRY(invalid_TSS) | |
fe7cacc1 | 869 | RING0_EC_FRAME |
e59d1b0a | 870 | ASM_CLAC |
df5d1874 | 871 | pushl_cfi $do_invalid_TSS |
1da177e4 | 872 | jmp error_code |
fe7cacc1 | 873 | CFI_ENDPROC |
47a55cd7 | 874 | END(invalid_TSS) |
1da177e4 LT |
875 | |
876 | ENTRY(segment_not_present) | |
fe7cacc1 | 877 | RING0_EC_FRAME |
e59d1b0a | 878 | ASM_CLAC |
df5d1874 | 879 | pushl_cfi $do_segment_not_present |
1da177e4 | 880 | jmp error_code |
fe7cacc1 | 881 | CFI_ENDPROC |
47a55cd7 | 882 | END(segment_not_present) |
1da177e4 LT |
883 | |
884 | ENTRY(stack_segment) | |
fe7cacc1 | 885 | RING0_EC_FRAME |
e59d1b0a | 886 | ASM_CLAC |
df5d1874 | 887 | pushl_cfi $do_stack_segment |
1da177e4 | 888 | jmp error_code |
fe7cacc1 | 889 | CFI_ENDPROC |
47a55cd7 | 890 | END(stack_segment) |
1da177e4 | 891 | |
1da177e4 | 892 | ENTRY(alignment_check) |
fe7cacc1 | 893 | RING0_EC_FRAME |
e59d1b0a | 894 | ASM_CLAC |
df5d1874 | 895 | pushl_cfi $do_alignment_check |
1da177e4 | 896 | jmp error_code |
fe7cacc1 | 897 | CFI_ENDPROC |
47a55cd7 | 898 | END(alignment_check) |
1da177e4 | 899 | |
d28c4393 P |
900 | ENTRY(divide_error) |
901 | RING0_INT_FRAME | |
e59d1b0a | 902 | ASM_CLAC |
df5d1874 JB |
903 | pushl_cfi $0 # no error code |
904 | pushl_cfi $do_divide_error | |
1da177e4 | 905 | jmp error_code |
fe7cacc1 | 906 | CFI_ENDPROC |
47a55cd7 | 907 | END(divide_error) |
1da177e4 LT |
908 | |
909 | #ifdef CONFIG_X86_MCE | |
910 | ENTRY(machine_check) | |
fe7cacc1 | 911 | RING0_INT_FRAME |
e59d1b0a | 912 | ASM_CLAC |
df5d1874 JB |
913 | pushl_cfi $0 |
914 | pushl_cfi machine_check_vector | |
1da177e4 | 915 | jmp error_code |
fe7cacc1 | 916 | CFI_ENDPROC |
47a55cd7 | 917 | END(machine_check) |
1da177e4 LT |
918 | #endif |
919 | ||
920 | ENTRY(spurious_interrupt_bug) | |
fe7cacc1 | 921 | RING0_INT_FRAME |
e59d1b0a | 922 | ASM_CLAC |
df5d1874 JB |
923 | pushl_cfi $0 |
924 | pushl_cfi $do_spurious_interrupt_bug | |
1da177e4 | 925 | jmp error_code |
fe7cacc1 | 926 | CFI_ENDPROC |
47a55cd7 | 927 | END(spurious_interrupt_bug) |
1da177e4 | 928 | |
5ead97c8 | 929 | #ifdef CONFIG_XEN |
e2a81baf JF |
930 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
931 | entrypoint expects, so fix it up before using the normal path. */ | |
932 | ENTRY(xen_sysenter_target) | |
933 | RING0_INT_FRAME | |
934 | addl $5*4, %esp /* remove xen-provided frame */ | |
2ddf9b7b | 935 | CFI_ADJUST_CFA_OFFSET -5*4 |
e2a81baf | 936 | jmp sysenter_past_esp |
557d7d4e | 937 | CFI_ENDPROC |
e2a81baf | 938 | |
5ead97c8 JF |
939 | ENTRY(xen_hypervisor_callback) |
940 | CFI_STARTPROC | |
a349e23d | 941 | pushl_cfi $-1 /* orig_ax = -1 => not a system call */ |
5ead97c8 JF |
942 | SAVE_ALL |
943 | TRACE_IRQS_OFF | |
9ec2b804 JF |
944 | |
945 | /* Check to see if we got the event in the critical | |
946 | region in xen_iret_direct, after we've reenabled | |
947 | events and checked for pending events. This simulates | |
948 | iret instruction's behaviour where it delivers a | |
949 | pending interrupt when enabling interrupts. */ | |
950 | movl PT_EIP(%esp),%eax | |
951 | cmpl $xen_iret_start_crit,%eax | |
952 | jb 1f | |
953 | cmpl $xen_iret_end_crit,%eax | |
954 | jae 1f | |
955 | ||
0f2c8769 | 956 | jmp xen_iret_crit_fixup |
e2a81baf | 957 | |
e2a81baf | 958 | ENTRY(xen_do_upcall) |
b77797fb | 959 | 1: mov %esp, %eax |
5ead97c8 | 960 | call xen_evtchn_do_upcall |
fdfd811d DV |
961 | #ifndef CONFIG_PREEMPT |
962 | call xen_maybe_preempt_hcall | |
963 | #endif | |
5ead97c8 JF |
964 | jmp ret_from_intr |
965 | CFI_ENDPROC | |
966 | ENDPROC(xen_hypervisor_callback) | |
967 | ||
968 | # Hypervisor uses this for application faults while it executes. | |
969 | # We get here for two reasons: | |
970 | # 1. Fault while reloading DS, ES, FS or GS | |
971 | # 2. Fault while executing IRET | |
972 | # Category 1 we fix up by reattempting the load, and zeroing the segment | |
973 | # register if the load fails. | |
974 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the | |
975 | # normal Linux return path in this case because if we use the IRET hypercall | |
976 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
977 | # We distinguish between categories by maintaining a status value in EAX. | |
978 | ENTRY(xen_failsafe_callback) | |
979 | CFI_STARTPROC | |
df5d1874 | 980 | pushl_cfi %eax |
5ead97c8 JF |
981 | movl $1,%eax |
982 | 1: mov 4(%esp),%ds | |
983 | 2: mov 8(%esp),%es | |
984 | 3: mov 12(%esp),%fs | |
985 | 4: mov 16(%esp),%gs | |
a349e23d DV |
986 | /* EAX == 0 => Category 1 (Bad segment) |
987 | EAX != 0 => Category 2 (Bad IRET) */ | |
5ead97c8 | 988 | testl %eax,%eax |
df5d1874 | 989 | popl_cfi %eax |
5ead97c8 JF |
990 | lea 16(%esp),%esp |
991 | CFI_ADJUST_CFA_OFFSET -16 | |
992 | jz 5f | |
a349e23d DV |
993 | jmp iret_exc |
994 | 5: pushl_cfi $-1 /* orig_ax = -1 => not a system call */ | |
5ead97c8 JF |
995 | SAVE_ALL |
996 | jmp ret_from_exception | |
997 | CFI_ENDPROC | |
998 | ||
999 | .section .fixup,"ax" | |
1000 | 6: xorl %eax,%eax | |
1001 | movl %eax,4(%esp) | |
1002 | jmp 1b | |
1003 | 7: xorl %eax,%eax | |
1004 | movl %eax,8(%esp) | |
1005 | jmp 2b | |
1006 | 8: xorl %eax,%eax | |
1007 | movl %eax,12(%esp) | |
1008 | jmp 3b | |
1009 | 9: xorl %eax,%eax | |
1010 | movl %eax,16(%esp) | |
1011 | jmp 4b | |
1012 | .previous | |
6837a54d PA |
1013 | _ASM_EXTABLE(1b,6b) |
1014 | _ASM_EXTABLE(2b,7b) | |
1015 | _ASM_EXTABLE(3b,8b) | |
1016 | _ASM_EXTABLE(4b,9b) | |
5ead97c8 JF |
1017 | ENDPROC(xen_failsafe_callback) |
1018 | ||
bc2b0331 | 1019 | BUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR, |
38e20b07 SY |
1020 | xen_evtchn_do_upcall) |
1021 | ||
5ead97c8 | 1022 | #endif /* CONFIG_XEN */ |
bc2b0331 S |
1023 | |
1024 | #if IS_ENABLED(CONFIG_HYPERV) | |
1025 | ||
1026 | BUILD_INTERRUPT3(hyperv_callback_vector, HYPERVISOR_CALLBACK_VECTOR, | |
1027 | hyperv_vector_handler) | |
1028 | ||
1029 | #endif /* CONFIG_HYPERV */ | |
5ead97c8 | 1030 | |
606576ce | 1031 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
1032 | #ifdef CONFIG_DYNAMIC_FTRACE |
1033 | ||
1034 | ENTRY(mcount) | |
d61f82d0 SR |
1035 | ret |
1036 | END(mcount) | |
1037 | ||
1038 | ENTRY(ftrace_caller) | |
1039 | pushl %eax | |
1040 | pushl %ecx | |
1041 | pushl %edx | |
08f6fba5 SR |
1042 | pushl $0 /* Pass NULL as regs pointer */ |
1043 | movl 4*4(%esp), %eax | |
d61f82d0 | 1044 | movl 0x4(%ebp), %edx |
1739f09e | 1045 | movl function_trace_op, %ecx |
395a59d0 | 1046 | subl $MCOUNT_INSN_SIZE, %eax |
d61f82d0 SR |
1047 | |
1048 | .globl ftrace_call | |
1049 | ftrace_call: | |
1050 | call ftrace_stub | |
1051 | ||
08f6fba5 | 1052 | addl $4,%esp /* skip NULL pointer */ |
d61f82d0 SR |
1053 | popl %edx |
1054 | popl %ecx | |
1055 | popl %eax | |
4de72395 | 1056 | ftrace_ret: |
5a45cfe1 SR |
1057 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1058 | .globl ftrace_graph_call | |
1059 | ftrace_graph_call: | |
1060 | jmp ftrace_stub | |
1061 | #endif | |
d61f82d0 SR |
1062 | |
1063 | .globl ftrace_stub | |
1064 | ftrace_stub: | |
1065 | ret | |
1066 | END(ftrace_caller) | |
1067 | ||
4de72395 SR |
1068 | ENTRY(ftrace_regs_caller) |
1069 | pushf /* push flags before compare (in cs location) */ | |
4de72395 SR |
1070 | |
1071 | /* | |
1072 | * i386 does not save SS and ESP when coming from kernel. | |
1073 | * Instead, to get sp, ®s->sp is used (see ptrace.h). | |
1074 | * Unfortunately, that means eflags must be at the same location | |
1075 | * as the current return ip is. We move the return ip into the | |
1076 | * ip location, and move flags into the return ip location. | |
1077 | */ | |
1078 | pushl 4(%esp) /* save return ip into ip slot */ | |
4de72395 SR |
1079 | |
1080 | pushl $0 /* Load 0 into orig_ax */ | |
1081 | pushl %gs | |
1082 | pushl %fs | |
1083 | pushl %es | |
1084 | pushl %ds | |
1085 | pushl %eax | |
1086 | pushl %ebp | |
1087 | pushl %edi | |
1088 | pushl %esi | |
1089 | pushl %edx | |
1090 | pushl %ecx | |
1091 | pushl %ebx | |
1092 | ||
1093 | movl 13*4(%esp), %eax /* Get the saved flags */ | |
1094 | movl %eax, 14*4(%esp) /* Move saved flags into regs->flags location */ | |
1095 | /* clobbering return ip */ | |
1096 | movl $__KERNEL_CS,13*4(%esp) | |
1097 | ||
1098 | movl 12*4(%esp), %eax /* Load ip (1st parameter) */ | |
a5e37863 | 1099 | subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */ |
e4ea3f6b | 1100 | movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ |
1739f09e | 1101 | movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ |
e4ea3f6b | 1102 | pushl %esp /* Save pt_regs as 4th parameter */ |
4de72395 SR |
1103 | |
1104 | GLOBAL(ftrace_regs_call) | |
1105 | call ftrace_stub | |
1106 | ||
1107 | addl $4, %esp /* Skip pt_regs */ | |
1108 | movl 14*4(%esp), %eax /* Move flags back into cs */ | |
1109 | movl %eax, 13*4(%esp) /* Needed to keep addl from modifying flags */ | |
1110 | movl 12*4(%esp), %eax /* Get return ip from regs->ip */ | |
4de72395 SR |
1111 | movl %eax, 14*4(%esp) /* Put return ip back for ret */ |
1112 | ||
1113 | popl %ebx | |
1114 | popl %ecx | |
1115 | popl %edx | |
1116 | popl %esi | |
1117 | popl %edi | |
1118 | popl %ebp | |
1119 | popl %eax | |
1120 | popl %ds | |
1121 | popl %es | |
1122 | popl %fs | |
1123 | popl %gs | |
1124 | addl $8, %esp /* Skip orig_ax and ip */ | |
1125 | popf /* Pop flags at end (no addl to corrupt flags) */ | |
1126 | jmp ftrace_ret | |
1127 | ||
4de72395 SR |
1128 | popf |
1129 | jmp ftrace_stub | |
d61f82d0 SR |
1130 | #else /* ! CONFIG_DYNAMIC_FTRACE */ |
1131 | ||
16444a8a | 1132 | ENTRY(mcount) |
af058ab0 PA |
1133 | cmpl $__PAGE_OFFSET, %esp |
1134 | jb ftrace_stub /* Paging not enabled yet? */ | |
1135 | ||
16444a8a ACM |
1136 | cmpl $ftrace_stub, ftrace_trace_function |
1137 | jnz trace | |
fb52607a | 1138 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
c2324b69 | 1139 | cmpl $ftrace_stub, ftrace_graph_return |
fb52607a | 1140 | jnz ftrace_graph_caller |
e49dc19c SR |
1141 | |
1142 | cmpl $ftrace_graph_entry_stub, ftrace_graph_entry | |
1143 | jnz ftrace_graph_caller | |
caf4b323 | 1144 | #endif |
16444a8a ACM |
1145 | .globl ftrace_stub |
1146 | ftrace_stub: | |
1147 | ret | |
1148 | ||
1149 | /* taken from glibc */ | |
1150 | trace: | |
1151 | pushl %eax | |
1152 | pushl %ecx | |
1153 | pushl %edx | |
1154 | movl 0xc(%esp), %eax | |
1155 | movl 0x4(%ebp), %edx | |
395a59d0 | 1156 | subl $MCOUNT_INSN_SIZE, %eax |
16444a8a | 1157 | |
d61f82d0 | 1158 | call *ftrace_trace_function |
16444a8a ACM |
1159 | |
1160 | popl %edx | |
1161 | popl %ecx | |
1162 | popl %eax | |
16444a8a ACM |
1163 | jmp ftrace_stub |
1164 | END(mcount) | |
d61f82d0 | 1165 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 1166 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 1167 | |
fb52607a FW |
1168 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1169 | ENTRY(ftrace_graph_caller) | |
caf4b323 FW |
1170 | pushl %eax |
1171 | pushl %ecx | |
1172 | pushl %edx | |
f823b37b SRRH |
1173 | movl 0xc(%esp), %eax |
1174 | lea 0x4(%ebp), %edx | |
71e308a2 | 1175 | movl (%ebp), %ecx |
f823b37b | 1176 | subl $MCOUNT_INSN_SIZE, %eax |
caf4b323 | 1177 | call prepare_ftrace_return |
caf4b323 FW |
1178 | popl %edx |
1179 | popl %ecx | |
1180 | popl %eax | |
e7d3737e | 1181 | ret |
fb52607a | 1182 | END(ftrace_graph_caller) |
caf4b323 FW |
1183 | |
1184 | .globl return_to_handler | |
1185 | return_to_handler: | |
caf4b323 | 1186 | pushl %eax |
caf4b323 | 1187 | pushl %edx |
71e308a2 | 1188 | movl %ebp, %eax |
caf4b323 | 1189 | call ftrace_return_to_handler |
194ec341 | 1190 | movl %eax, %ecx |
caf4b323 | 1191 | popl %edx |
caf4b323 | 1192 | popl %eax |
194ec341 | 1193 | jmp *%ecx |
e7d3737e | 1194 | #endif |
16444a8a | 1195 | |
25c74b10 SA |
1196 | #ifdef CONFIG_TRACING |
1197 | ENTRY(trace_page_fault) | |
1198 | RING0_EC_FRAME | |
1199 | ASM_CLAC | |
1200 | pushl_cfi $trace_do_page_fault | |
1201 | jmp error_code | |
1202 | CFI_ENDPROC | |
1203 | END(trace_page_fault) | |
1204 | #endif | |
1205 | ||
d211af05 AH |
1206 | ENTRY(page_fault) |
1207 | RING0_EC_FRAME | |
e59d1b0a | 1208 | ASM_CLAC |
df5d1874 | 1209 | pushl_cfi $do_page_fault |
d211af05 AH |
1210 | ALIGN |
1211 | error_code: | |
ccbeed3a | 1212 | /* the function address is in %gs's slot on the stack */ |
df5d1874 | 1213 | pushl_cfi %fs |
ccbeed3a | 1214 | /*CFI_REL_OFFSET fs, 0*/ |
df5d1874 | 1215 | pushl_cfi %es |
d211af05 | 1216 | /*CFI_REL_OFFSET es, 0*/ |
df5d1874 | 1217 | pushl_cfi %ds |
d211af05 | 1218 | /*CFI_REL_OFFSET ds, 0*/ |
49db46a6 DV |
1219 | pushl_cfi_reg eax |
1220 | pushl_cfi_reg ebp | |
1221 | pushl_cfi_reg edi | |
1222 | pushl_cfi_reg esi | |
1223 | pushl_cfi_reg edx | |
1224 | pushl_cfi_reg ecx | |
1225 | pushl_cfi_reg ebx | |
d211af05 | 1226 | cld |
d211af05 AH |
1227 | movl $(__KERNEL_PERCPU), %ecx |
1228 | movl %ecx, %fs | |
1229 | UNWIND_ESPFIX_STACK | |
ccbeed3a TH |
1230 | GS_TO_REG %ecx |
1231 | movl PT_GS(%esp), %edi # get the function address | |
d211af05 AH |
1232 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
1233 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart | |
ccbeed3a TH |
1234 | REG_TO_PTGS %ecx |
1235 | SET_KERNEL_GS %ecx | |
d211af05 AH |
1236 | movl $(__USER_DS), %ecx |
1237 | movl %ecx, %ds | |
1238 | movl %ecx, %es | |
1239 | TRACE_IRQS_OFF | |
1240 | movl %esp,%eax # pt_regs pointer | |
1241 | call *%edi | |
1242 | jmp ret_from_exception | |
1243 | CFI_ENDPROC | |
1244 | END(page_fault) | |
1245 | ||
1246 | /* | |
1247 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
1248 | * that sets up the real kernel stack. Check here, since we can't | |
1249 | * allow the wrong stack to be used. | |
1250 | * | |
1251 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have | |
1252 | * already pushed 3 words if it hits on the sysenter instruction: | |
1253 | * eflags, cs and eip. | |
1254 | * | |
1255 | * We just load the right stack, and push the three (known) values | |
1256 | * by hand onto the new stack - while updating the return eip past | |
1257 | * the instruction that would have done it for sysenter. | |
1258 | */ | |
f0d96110 TH |
1259 | .macro FIX_STACK offset ok label |
1260 | cmpw $__KERNEL_CS, 4(%esp) | |
1261 | jne \ok | |
1262 | \label: | |
1263 | movl TSS_sysenter_sp0 + \offset(%esp), %esp | |
1264 | CFI_DEF_CFA esp, 0 | |
1265 | CFI_UNDEFINED eip | |
df5d1874 JB |
1266 | pushfl_cfi |
1267 | pushl_cfi $__KERNEL_CS | |
1268 | pushl_cfi $sysenter_past_esp | |
d211af05 | 1269 | CFI_REL_OFFSET eip, 0 |
f0d96110 | 1270 | .endm |
d211af05 AH |
1271 | |
1272 | ENTRY(debug) | |
1273 | RING0_INT_FRAME | |
e59d1b0a | 1274 | ASM_CLAC |
d211af05 AH |
1275 | cmpl $ia32_sysenter_target,(%esp) |
1276 | jne debug_stack_correct | |
f0d96110 | 1277 | FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn |
d211af05 | 1278 | debug_stack_correct: |
df5d1874 | 1279 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1280 | SAVE_ALL |
1281 | TRACE_IRQS_OFF | |
1282 | xorl %edx,%edx # error code 0 | |
1283 | movl %esp,%eax # pt_regs pointer | |
1284 | call do_debug | |
1285 | jmp ret_from_exception | |
1286 | CFI_ENDPROC | |
1287 | END(debug) | |
1288 | ||
1289 | /* | |
1290 | * NMI is doubly nasty. It can happen _while_ we're handling | |
1291 | * a debug fault, and the debug fault hasn't yet been able to | |
1292 | * clear up the stack. So we first check whether we got an | |
1293 | * NMI on the sysenter entry path, but after that we need to | |
1294 | * check whether we got an NMI on the debug path where the debug | |
1295 | * fault happened on the sysenter path. | |
1296 | */ | |
1297 | ENTRY(nmi) | |
1298 | RING0_INT_FRAME | |
e59d1b0a | 1299 | ASM_CLAC |
34273f41 | 1300 | #ifdef CONFIG_X86_ESPFIX32 |
df5d1874 | 1301 | pushl_cfi %eax |
d211af05 AH |
1302 | movl %ss, %eax |
1303 | cmpw $__ESPFIX_SS, %ax | |
df5d1874 | 1304 | popl_cfi %eax |
d211af05 | 1305 | je nmi_espfix_stack |
34273f41 | 1306 | #endif |
d211af05 AH |
1307 | cmpl $ia32_sysenter_target,(%esp) |
1308 | je nmi_stack_fixup | |
df5d1874 | 1309 | pushl_cfi %eax |
d211af05 AH |
1310 | movl %esp,%eax |
1311 | /* Do not access memory above the end of our stack page, | |
1312 | * it might not exist. | |
1313 | */ | |
1314 | andl $(THREAD_SIZE-1),%eax | |
1315 | cmpl $(THREAD_SIZE-20),%eax | |
df5d1874 | 1316 | popl_cfi %eax |
d211af05 AH |
1317 | jae nmi_stack_correct |
1318 | cmpl $ia32_sysenter_target,12(%esp) | |
1319 | je nmi_debug_stack_check | |
1320 | nmi_stack_correct: | |
1321 | /* We have a RING0_INT_FRAME here */ | |
df5d1874 | 1322 | pushl_cfi %eax |
d211af05 | 1323 | SAVE_ALL |
d211af05 AH |
1324 | xorl %edx,%edx # zero error code |
1325 | movl %esp,%eax # pt_regs pointer | |
1326 | call do_nmi | |
2e04bc76 | 1327 | jmp restore_all_notrace |
d211af05 AH |
1328 | CFI_ENDPROC |
1329 | ||
1330 | nmi_stack_fixup: | |
1331 | RING0_INT_FRAME | |
f0d96110 | 1332 | FIX_STACK 12, nmi_stack_correct, 1 |
d211af05 AH |
1333 | jmp nmi_stack_correct |
1334 | ||
1335 | nmi_debug_stack_check: | |
1336 | /* We have a RING0_INT_FRAME here */ | |
1337 | cmpw $__KERNEL_CS,16(%esp) | |
1338 | jne nmi_stack_correct | |
1339 | cmpl $debug,(%esp) | |
1340 | jb nmi_stack_correct | |
1341 | cmpl $debug_esp_fix_insn,(%esp) | |
1342 | ja nmi_stack_correct | |
f0d96110 | 1343 | FIX_STACK 24, nmi_stack_correct, 1 |
d211af05 AH |
1344 | jmp nmi_stack_correct |
1345 | ||
34273f41 | 1346 | #ifdef CONFIG_X86_ESPFIX32 |
d211af05 AH |
1347 | nmi_espfix_stack: |
1348 | /* We have a RING0_INT_FRAME here. | |
1349 | * | |
1350 | * create the pointer to lss back | |
1351 | */ | |
df5d1874 JB |
1352 | pushl_cfi %ss |
1353 | pushl_cfi %esp | |
bda3a897 | 1354 | addl $4, (%esp) |
d211af05 AH |
1355 | /* copy the iret frame of 12 bytes */ |
1356 | .rept 3 | |
df5d1874 | 1357 | pushl_cfi 16(%esp) |
d211af05 | 1358 | .endr |
df5d1874 | 1359 | pushl_cfi %eax |
d211af05 | 1360 | SAVE_ALL |
d211af05 AH |
1361 | FIXUP_ESPFIX_STACK # %eax == %esp |
1362 | xorl %edx,%edx # zero error code | |
1363 | call do_nmi | |
1364 | RESTORE_REGS | |
1365 | lss 12+4(%esp), %esp # back to espfix stack | |
1366 | CFI_ADJUST_CFA_OFFSET -24 | |
1367 | jmp irq_return | |
34273f41 | 1368 | #endif |
d211af05 AH |
1369 | CFI_ENDPROC |
1370 | END(nmi) | |
1371 | ||
1372 | ENTRY(int3) | |
1373 | RING0_INT_FRAME | |
e59d1b0a | 1374 | ASM_CLAC |
df5d1874 | 1375 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1376 | SAVE_ALL |
1377 | TRACE_IRQS_OFF | |
1378 | xorl %edx,%edx # zero error code | |
1379 | movl %esp,%eax # pt_regs pointer | |
1380 | call do_int3 | |
1381 | jmp ret_from_exception | |
1382 | CFI_ENDPROC | |
1383 | END(int3) | |
1384 | ||
1385 | ENTRY(general_protection) | |
1386 | RING0_EC_FRAME | |
df5d1874 | 1387 | pushl_cfi $do_general_protection |
d211af05 AH |
1388 | jmp error_code |
1389 | CFI_ENDPROC | |
1390 | END(general_protection) | |
1391 | ||
631bc487 GN |
1392 | #ifdef CONFIG_KVM_GUEST |
1393 | ENTRY(async_page_fault) | |
1394 | RING0_EC_FRAME | |
e59d1b0a | 1395 | ASM_CLAC |
60cf637a | 1396 | pushl_cfi $do_async_page_fault |
631bc487 GN |
1397 | jmp error_code |
1398 | CFI_ENDPROC | |
2ae9d293 | 1399 | END(async_page_fault) |
631bc487 GN |
1400 | #endif |
1401 |