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 | |
a00e817f MH |
317 | /* |
318 | * Interrupt exit functions should be protected against kprobes | |
319 | */ | |
320 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
321 | /* |
322 | * Return to user mode is not as complex as all this looks, | |
323 | * but we want the default path for a system call return to | |
324 | * go as quickly as possible which is why some of this is | |
325 | * less clear than it otherwise should be. | |
326 | */ | |
327 | ||
328 | # userspace resumption stub bypassing syscall exit tracing | |
329 | ALIGN | |
fe7cacc1 | 330 | RING0_PTREGS_FRAME |
1da177e4 | 331 | ret_from_exception: |
139ec7c4 | 332 | preempt_stop(CLBR_ANY) |
1da177e4 LT |
333 | ret_from_intr: |
334 | GET_THREAD_INFO(%ebp) | |
29a2e283 | 335 | #ifdef CONFIG_VM86 |
eb5b7b9d JF |
336 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
337 | movb PT_CS(%esp), %al | |
ab68ed98 | 338 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
29a2e283 DA |
339 | #else |
340 | /* | |
6783eaa2 | 341 | * We can be coming here from child spawned by kernel_thread(). |
29a2e283 DA |
342 | */ |
343 | movl PT_CS(%esp), %eax | |
344 | andl $SEGMENT_RPL_MASK, %eax | |
345 | #endif | |
78be3706 RR |
346 | cmpl $USER_RPL, %eax |
347 | jb resume_kernel # not returning to v8086 or userspace | |
f95d47ca | 348 | |
1da177e4 | 349 | ENTRY(resume_userspace) |
c7e872e7 | 350 | LOCKDEP_SYS_EXIT |
139ec7c4 | 351 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
352 | # setting need_resched or sigpending |
353 | # between sampling and the iret | |
e32e58a9 | 354 | TRACE_IRQS_OFF |
1da177e4 LT |
355 | movl TI_flags(%ebp), %ecx |
356 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
357 | # int/exception return? | |
358 | jne work_pending | |
359 | jmp restore_all | |
47a55cd7 | 360 | END(ret_from_exception) |
1da177e4 LT |
361 | |
362 | #ifdef CONFIG_PREEMPT | |
363 | ENTRY(resume_kernel) | |
139ec7c4 | 364 | DISABLE_INTERRUPTS(CLBR_ANY) |
1da177e4 | 365 | need_resched: |
c2daa3be PZ |
366 | cmpl $0,PER_CPU_VAR(__preempt_count) |
367 | jnz restore_all | |
ab68ed98 | 368 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
1da177e4 LT |
369 | jz restore_all |
370 | call preempt_schedule_irq | |
371 | jmp need_resched | |
47a55cd7 | 372 | END(resume_kernel) |
1da177e4 | 373 | #endif |
fe7cacc1 | 374 | CFI_ENDPROC |
a00e817f MH |
375 | /* |
376 | * End of kprobes section | |
377 | */ | |
378 | .popsection | |
1da177e4 LT |
379 | |
380 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
381 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
382 | ||
383 | # sysenter call handler stub | |
0aa97fb2 | 384 | ENTRY(ia32_sysenter_target) |
fe7cacc1 | 385 | CFI_STARTPROC simple |
adf14236 | 386 | CFI_SIGNAL_FRAME |
fe7cacc1 JB |
387 | CFI_DEF_CFA esp, 0 |
388 | CFI_REGISTER esp, ebp | |
faca6227 | 389 | movl TSS_sysenter_sp0(%esp),%esp |
1da177e4 | 390 | sysenter_past_esp: |
55f327fa | 391 | /* |
d93c870b JF |
392 | * Interrupts are disabled here, but we can't trace it until |
393 | * enough kernel state to call TRACE_IRQS_OFF can be called - but | |
394 | * we immediately enable interrupts at that point anyway. | |
55f327fa | 395 | */ |
3234282f | 396 | pushl_cfi $__USER_DS |
fe7cacc1 | 397 | /*CFI_REL_OFFSET ss, 0*/ |
df5d1874 | 398 | pushl_cfi %ebp |
fe7cacc1 | 399 | CFI_REL_OFFSET esp, 0 |
df5d1874 | 400 | pushfl_cfi |
d93c870b | 401 | orl $X86_EFLAGS_IF, (%esp) |
3234282f | 402 | pushl_cfi $__USER_CS |
fe7cacc1 | 403 | /*CFI_REL_OFFSET cs, 0*/ |
e6e5494c IM |
404 | /* |
405 | * Push current_thread_info()->sysenter_return to the stack. | |
406 | * A tiny bit of offset fixup is necessary - 4*4 means the 4 words | |
407 | * pushed above; +8 corresponds to copy_thread's esp0 setting. | |
408 | */ | |
7bf04be8 | 409 | pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp) |
fe7cacc1 | 410 | CFI_REL_OFFSET eip, 0 |
1da177e4 | 411 | |
df5d1874 | 412 | pushl_cfi %eax |
d93c870b JF |
413 | SAVE_ALL |
414 | ENABLE_INTERRUPTS(CLBR_NONE) | |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Load the potential sixth argument from user stack. | |
418 | * Careful about security. | |
419 | */ | |
420 | cmpl $__PAGE_OFFSET-3,%ebp | |
421 | jae syscall_fault | |
e59d1b0a | 422 | ASM_STAC |
1da177e4 | 423 | 1: movl (%ebp),%ebp |
e59d1b0a | 424 | ASM_CLAC |
d93c870b | 425 | movl %ebp,PT_EBP(%esp) |
6837a54d | 426 | _ASM_EXTABLE(1b,syscall_fault) |
1da177e4 | 427 | |
1da177e4 LT |
428 | GET_THREAD_INFO(%ebp) |
429 | ||
88200bc2 | 430 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
af0575bb RM |
431 | jnz sysenter_audit |
432 | sysenter_do_call: | |
303395ac | 433 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
434 | jae syscall_badsys |
435 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 436 | movl %eax,PT_EAX(%esp) |
c7e872e7 | 437 | LOCKDEP_SYS_EXIT |
42c24fa2 | 438 | DISABLE_INTERRUPTS(CLBR_ANY) |
55f327fa | 439 | TRACE_IRQS_OFF |
1da177e4 | 440 | movl TI_flags(%ebp), %ecx |
88200bc2 | 441 | testl $_TIF_ALLWORK_MASK, %ecx |
af0575bb RM |
442 | jne sysexit_audit |
443 | sysenter_exit: | |
1da177e4 | 444 | /* if something modifies registers it must also disable sysexit */ |
eb5b7b9d JF |
445 | movl PT_EIP(%esp), %edx |
446 | movl PT_OLDESP(%esp), %ecx | |
1da177e4 | 447 | xorl %ebp,%ebp |
55f327fa | 448 | TRACE_IRQS_ON |
464d1a78 | 449 | 1: mov PT_FS(%esp), %fs |
ccbeed3a | 450 | PTGS_TO_GS |
d75cd22f | 451 | ENABLE_INTERRUPTS_SYSEXIT |
af0575bb RM |
452 | |
453 | #ifdef CONFIG_AUDITSYSCALL | |
454 | sysenter_audit: | |
88200bc2 | 455 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
af0575bb RM |
456 | jnz syscall_trace_entry |
457 | addl $4,%esp | |
458 | CFI_ADJUST_CFA_OFFSET -4 | |
459 | /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ | |
460 | /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ | |
461 | /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ | |
462 | movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ | |
463 | movl %eax,%edx /* 2nd arg: syscall number */ | |
464 | movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ | |
b05d8447 | 465 | call __audit_syscall_entry |
df5d1874 | 466 | pushl_cfi %ebx |
af0575bb RM |
467 | movl PT_EAX(%esp),%eax /* reload syscall number */ |
468 | jmp sysenter_do_call | |
469 | ||
470 | sysexit_audit: | |
88200bc2 | 471 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
472 | jne syscall_exit_work |
473 | TRACE_IRQS_ON | |
474 | ENABLE_INTERRUPTS(CLBR_ANY) | |
475 | movl %eax,%edx /* second arg, syscall return value */ | |
d7e7528b EP |
476 | cmpl $-MAX_ERRNO,%eax /* is it an error ? */ |
477 | setbe %al /* 1 if so, 0 if not */ | |
af0575bb | 478 | movzbl %al,%eax /* zero-extend that */ |
d7e7528b | 479 | call __audit_syscall_exit |
af0575bb RM |
480 | DISABLE_INTERRUPTS(CLBR_ANY) |
481 | TRACE_IRQS_OFF | |
482 | movl TI_flags(%ebp), %ecx | |
88200bc2 | 483 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
484 | jne syscall_exit_work |
485 | movl PT_EAX(%esp),%eax /* reload syscall return value */ | |
486 | jmp sysenter_exit | |
487 | #endif | |
488 | ||
fe7cacc1 | 489 | CFI_ENDPROC |
f95d47ca | 490 | .pushsection .fixup,"ax" |
464d1a78 | 491 | 2: movl $0,PT_FS(%esp) |
f95d47ca | 492 | jmp 1b |
f95d47ca | 493 | .popsection |
6837a54d | 494 | _ASM_EXTABLE(1b,2b) |
ccbeed3a | 495 | PTGS_TO_GS_EX |
0aa97fb2 | 496 | ENDPROC(ia32_sysenter_target) |
1da177e4 | 497 | |
a00e817f MH |
498 | /* |
499 | * syscall stub including irq exit should be protected against kprobes | |
500 | */ | |
501 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
502 | # system call handler stub |
503 | ENTRY(system_call) | |
fe7cacc1 | 504 | RING0_INT_FRAME # can't unwind into user space anyway |
e59d1b0a | 505 | ASM_CLAC |
df5d1874 | 506 | pushl_cfi %eax # save orig_eax |
1da177e4 LT |
507 | SAVE_ALL |
508 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 509 | # system call tracing in operation / emulation |
88200bc2 | 510 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
1da177e4 | 511 | jnz syscall_trace_entry |
303395ac | 512 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
513 | jae syscall_badsys |
514 | syscall_call: | |
515 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 516 | movl %eax,PT_EAX(%esp) # store the return value |
1da177e4 | 517 | syscall_exit: |
c7e872e7 | 518 | LOCKDEP_SYS_EXIT |
139ec7c4 | 519 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
520 | # setting need_resched or sigpending |
521 | # between sampling and the iret | |
55f327fa | 522 | TRACE_IRQS_OFF |
1da177e4 | 523 | movl TI_flags(%ebp), %ecx |
88200bc2 | 524 | testl $_TIF_ALLWORK_MASK, %ecx # current->work |
1da177e4 LT |
525 | jne syscall_exit_work |
526 | ||
527 | restore_all: | |
2e04bc76 AH |
528 | TRACE_IRQS_IRET |
529 | restore_all_notrace: | |
eb5b7b9d JF |
530 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
531 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we | |
5df24082 SS |
532 | # are returning to the kernel. |
533 | # See comments in process.c:copy_thread() for details. | |
eb5b7b9d JF |
534 | movb PT_OLDSS(%esp), %ah |
535 | movb PT_CS(%esp), %al | |
ab68ed98 | 536 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
78be3706 | 537 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
fe7cacc1 | 538 | CFI_REMEMBER_STATE |
1da177e4 LT |
539 | je ldt_ss # returning to user-space with LDT SS |
540 | restore_nocheck: | |
ccbeed3a | 541 | RESTORE_REGS 4 # skip orig_eax/error_code |
f7f3d791 | 542 | irq_return: |
3701d863 | 543 | INTERRUPT_RETURN |
1da177e4 | 544 | .section .fixup,"ax" |
90e9f536 | 545 | ENTRY(iret_exc) |
a879cbbb LT |
546 | pushl $0 # no error code |
547 | pushl $do_iret_error | |
548 | jmp error_code | |
1da177e4 | 549 | .previous |
6837a54d | 550 | _ASM_EXTABLE(irq_return,iret_exc) |
1da177e4 | 551 | |
fe7cacc1 | 552 | CFI_RESTORE_STATE |
1da177e4 | 553 | ldt_ss: |
eb5b7b9d | 554 | larl PT_OLDSS(%esp), %eax |
1da177e4 LT |
555 | jnz restore_nocheck |
556 | testl $0x00400000, %eax # returning to 32bit stack? | |
557 | jnz restore_nocheck # allright, normal return | |
d3561b7f RR |
558 | |
559 | #ifdef CONFIG_PARAVIRT | |
560 | /* | |
561 | * The kernel can't run on a non-flat stack if paravirt mode | |
562 | * is active. Rather than try to fixup the high bits of | |
563 | * ESP, bypass this code entirely. This may break DOSemu | |
564 | * and/or Wine support in a paravirt VM, although the option | |
565 | * is still available to implement the setting of the high | |
566 | * 16-bits in the INTERRUPT_RETURN paravirt-op. | |
567 | */ | |
93b1eab3 | 568 | cmpl $0, pv_info+PARAVIRT_enabled |
d3561b7f RR |
569 | jne restore_nocheck |
570 | #endif | |
571 | ||
dc4c2a0a AH |
572 | /* |
573 | * Setup and switch to ESPFIX stack | |
574 | * | |
575 | * We're returning to userspace with a 16 bit stack. The CPU will not | |
576 | * restore the high word of ESP for us on executing iret... This is an | |
577 | * "official" bug of all the x86-compatible CPUs, which we can work | |
578 | * around to make dosemu and wine happy. We do this by preloading the | |
579 | * high word of ESP with the high word of the userspace ESP while | |
580 | * compensating for the offset by changing to the ESPFIX segment with | |
581 | * a base address that matches for the difference. | |
582 | */ | |
72c511dd | 583 | #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) |
dc4c2a0a AH |
584 | mov %esp, %edx /* load kernel esp */ |
585 | mov PT_OLDESP(%esp), %eax /* load userspace esp */ | |
586 | mov %dx, %ax /* eax: new kernel esp */ | |
587 | sub %eax, %edx /* offset (low word is 0) */ | |
dc4c2a0a | 588 | shr $16, %edx |
72c511dd BG |
589 | mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ |
590 | mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ | |
df5d1874 JB |
591 | pushl_cfi $__ESPFIX_SS |
592 | pushl_cfi %eax /* new kernel esp */ | |
2e04bc76 AH |
593 | /* Disable interrupts, but do not irqtrace this section: we |
594 | * will soon execute iret and the tracer was already set to | |
595 | * the irqstate after the iret */ | |
139ec7c4 | 596 | DISABLE_INTERRUPTS(CLBR_EAX) |
dc4c2a0a | 597 | lss (%esp), %esp /* switch to espfix segment */ |
be44d2aa SS |
598 | CFI_ADJUST_CFA_OFFSET -8 |
599 | jmp restore_nocheck | |
fe7cacc1 | 600 | CFI_ENDPROC |
47a55cd7 | 601 | ENDPROC(system_call) |
1da177e4 LT |
602 | |
603 | # perform work that needs to be done immediately before resumption | |
604 | ALIGN | |
fe7cacc1 | 605 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
1da177e4 LT |
606 | work_pending: |
607 | testb $_TIF_NEED_RESCHED, %cl | |
608 | jz work_notifysig | |
609 | work_resched: | |
610 | call schedule | |
c7e872e7 | 611 | LOCKDEP_SYS_EXIT |
139ec7c4 | 612 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
613 | # setting need_resched or sigpending |
614 | # between sampling and the iret | |
55f327fa | 615 | TRACE_IRQS_OFF |
1da177e4 LT |
616 | movl TI_flags(%ebp), %ecx |
617 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
618 | # than syscall tracing? | |
619 | jz restore_all | |
620 | testb $_TIF_NEED_RESCHED, %cl | |
621 | jnz work_resched | |
622 | ||
623 | work_notifysig: # deal with pending signals and | |
624 | # notify-resume requests | |
74b47a78 | 625 | #ifdef CONFIG_VM86 |
ab68ed98 | 626 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
1da177e4 LT |
627 | movl %esp, %eax |
628 | jne work_notifysig_v86 # returning to kernel-space or | |
629 | # vm86-space | |
969ae0bf AV |
630 | 1: |
631 | #else | |
632 | movl %esp, %eax | |
633 | #endif | |
3596ff4e SD |
634 | TRACE_IRQS_ON |
635 | ENABLE_INTERRUPTS(CLBR_NONE) | |
44fbbb3d AV |
636 | movb PT_CS(%esp), %bl |
637 | andb $SEGMENT_RPL_MASK, %bl | |
638 | cmpb $USER_RPL, %bl | |
639 | jb resume_kernel | |
1da177e4 LT |
640 | xorl %edx, %edx |
641 | call do_notify_resume | |
44fbbb3d | 642 | jmp resume_userspace |
1da177e4 | 643 | |
969ae0bf | 644 | #ifdef CONFIG_VM86 |
1da177e4 LT |
645 | ALIGN |
646 | work_notifysig_v86: | |
df5d1874 | 647 | pushl_cfi %ecx # save ti_flags for do_notify_resume |
1da177e4 | 648 | call save_v86_state # %eax contains pt_regs pointer |
df5d1874 | 649 | popl_cfi %ecx |
1da177e4 | 650 | movl %eax, %esp |
969ae0bf | 651 | jmp 1b |
74b47a78 | 652 | #endif |
47a55cd7 | 653 | END(work_pending) |
1da177e4 LT |
654 | |
655 | # perform syscall exit tracing | |
656 | ALIGN | |
657 | syscall_trace_entry: | |
eb5b7b9d | 658 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 659 | movl %esp, %eax |
d4d67150 RM |
660 | call syscall_trace_enter |
661 | /* What it returned is what we'll actually use. */ | |
303395ac | 662 | cmpl $(NR_syscalls), %eax |
1da177e4 LT |
663 | jnae syscall_call |
664 | jmp syscall_exit | |
47a55cd7 | 665 | END(syscall_trace_entry) |
1da177e4 LT |
666 | |
667 | # perform syscall exit tracing | |
668 | ALIGN | |
669 | syscall_exit_work: | |
88200bc2 | 670 | testl $_TIF_WORK_SYSCALL_EXIT, %ecx |
1da177e4 | 671 | jz work_pending |
55f327fa | 672 | TRACE_IRQS_ON |
d4d67150 | 673 | ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call |
1da177e4 LT |
674 | # schedule() instead |
675 | movl %esp, %eax | |
d4d67150 | 676 | call syscall_trace_leave |
1da177e4 | 677 | jmp resume_userspace |
47a55cd7 | 678 | END(syscall_exit_work) |
fe7cacc1 | 679 | CFI_ENDPROC |
1da177e4 | 680 | |
fe7cacc1 | 681 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 682 | syscall_fault: |
e59d1b0a | 683 | ASM_CLAC |
1da177e4 | 684 | GET_THREAD_INFO(%ebp) |
eb5b7b9d | 685 | movl $-EFAULT,PT_EAX(%esp) |
1da177e4 | 686 | jmp resume_userspace |
47a55cd7 | 687 | END(syscall_fault) |
1da177e4 | 688 | |
1da177e4 | 689 | syscall_badsys: |
eb5b7b9d | 690 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 691 | jmp resume_userspace |
47a55cd7 | 692 | END(syscall_badsys) |
fe7cacc1 | 693 | CFI_ENDPROC |
a00e817f MH |
694 | /* |
695 | * End of kprobes section | |
696 | */ | |
697 | .popsection | |
1da177e4 | 698 | |
f0d96110 | 699 | .macro FIXUP_ESPFIX_STACK |
dc4c2a0a AH |
700 | /* |
701 | * Switch back for ESPFIX stack to the normal zerobased stack | |
702 | * | |
703 | * We can't call C functions using the ESPFIX stack. This code reads | |
704 | * the high word of the segment base from the GDT and swiches to the | |
705 | * normal stack and adjusts ESP with the matching offset. | |
706 | */ | |
707 | /* fixup the stack */ | |
72c511dd BG |
708 | mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ |
709 | mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ | |
dc4c2a0a AH |
710 | shl $16, %eax |
711 | addl %esp, %eax /* the adjusted stack pointer */ | |
df5d1874 JB |
712 | pushl_cfi $__KERNEL_DS |
713 | pushl_cfi %eax | |
dc4c2a0a | 714 | lss (%esp), %esp /* switch to the normal stack segment */ |
f0d96110 TH |
715 | CFI_ADJUST_CFA_OFFSET -8 |
716 | .endm | |
717 | .macro UNWIND_ESPFIX_STACK | |
718 | movl %ss, %eax | |
719 | /* see if on espfix stack */ | |
720 | cmpw $__ESPFIX_SS, %ax | |
721 | jne 27f | |
722 | movl $__KERNEL_DS, %eax | |
723 | movl %eax, %ds | |
724 | movl %eax, %es | |
725 | /* switch to normal stack */ | |
726 | FIXUP_ESPFIX_STACK | |
727 | 27: | |
728 | .endm | |
1da177e4 LT |
729 | |
730 | /* | |
b7c6244f PA |
731 | * Build the entry stubs and pointer table with some assembler magic. |
732 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
733 | * single cache line on all modern x86 implementations. | |
1da177e4 | 734 | */ |
4687518c | 735 | .section .init.rodata,"a" |
1da177e4 | 736 | ENTRY(interrupt) |
ea714547 | 737 | .section .entry.text, "ax" |
b7c6244f PA |
738 | .p2align 5 |
739 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
1da177e4 | 740 | ENTRY(irq_entries_start) |
fe7cacc1 | 741 | RING0_INT_FRAME |
4687518c | 742 | vector=FIRST_EXTERNAL_VECTOR |
b7c6244f PA |
743 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 |
744 | .balign 32 | |
745 | .rept 7 | |
746 | .if vector < NR_VECTORS | |
8665596e | 747 | .if vector <> FIRST_EXTERNAL_VECTOR |
fe7cacc1 | 748 | CFI_ADJUST_CFA_OFFSET -4 |
b7c6244f | 749 | .endif |
df5d1874 | 750 | 1: pushl_cfi $(~vector+0x80) /* Note: always in signed byte range */ |
8665596e | 751 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
b7c6244f PA |
752 | jmp 2f |
753 | .endif | |
754 | .previous | |
1da177e4 | 755 | .long 1b |
ea714547 | 756 | .section .entry.text, "ax" |
1da177e4 | 757 | vector=vector+1 |
b7c6244f PA |
758 | .endif |
759 | .endr | |
760 | 2: jmp common_interrupt | |
1da177e4 | 761 | .endr |
47a55cd7 JB |
762 | END(irq_entries_start) |
763 | ||
764 | .previous | |
765 | END(interrupt) | |
766 | .previous | |
1da177e4 | 767 | |
55f327fa IM |
768 | /* |
769 | * the CPU automatically disables interrupts when executing an IRQ vector, | |
770 | * so IRQ-flags tracing has to follow that: | |
771 | */ | |
b7c6244f | 772 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
1da177e4 | 773 | common_interrupt: |
e59d1b0a | 774 | ASM_CLAC |
b7c6244f | 775 | addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ |
1da177e4 | 776 | SAVE_ALL |
55f327fa | 777 | TRACE_IRQS_OFF |
1da177e4 LT |
778 | movl %esp,%eax |
779 | call do_IRQ | |
780 | jmp ret_from_intr | |
47a55cd7 | 781 | ENDPROC(common_interrupt) |
fe7cacc1 | 782 | CFI_ENDPROC |
1da177e4 | 783 | |
a00e817f MH |
784 | /* |
785 | * Irq entries should be protected against kprobes | |
786 | */ | |
787 | .pushsection .kprobes.text, "ax" | |
02cf94c3 | 788 | #define BUILD_INTERRUPT3(name, nr, fn) \ |
1da177e4 | 789 | ENTRY(name) \ |
fe7cacc1 | 790 | RING0_INT_FRAME; \ |
e59d1b0a | 791 | ASM_CLAC; \ |
df5d1874 | 792 | pushl_cfi $~(nr); \ |
fe7cacc1 | 793 | SAVE_ALL; \ |
55f327fa | 794 | TRACE_IRQS_OFF \ |
1da177e4 | 795 | movl %esp,%eax; \ |
02cf94c3 | 796 | call fn; \ |
55f327fa | 797 | jmp ret_from_intr; \ |
47a55cd7 JB |
798 | CFI_ENDPROC; \ |
799 | ENDPROC(name) | |
1da177e4 | 800 | |
cf910e83 SA |
801 | |
802 | #ifdef CONFIG_TRACING | |
803 | #define TRACE_BUILD_INTERRUPT(name, nr) \ | |
804 | BUILD_INTERRUPT3(trace_##name, nr, smp_trace_##name) | |
805 | #else | |
806 | #define TRACE_BUILD_INTERRUPT(name, nr) | |
807 | #endif | |
808 | ||
809 | #define BUILD_INTERRUPT(name, nr) \ | |
810 | BUILD_INTERRUPT3(name, nr, smp_##name); \ | |
811 | TRACE_BUILD_INTERRUPT(name, nr) | |
02cf94c3 | 812 | |
1da177e4 | 813 | /* The include is where all of the SMP etc. interrupts come from */ |
1164dd00 | 814 | #include <asm/entry_arch.h> |
1da177e4 | 815 | |
1da177e4 | 816 | ENTRY(coprocessor_error) |
fe7cacc1 | 817 | RING0_INT_FRAME |
e59d1b0a | 818 | ASM_CLAC |
df5d1874 JB |
819 | pushl_cfi $0 |
820 | pushl_cfi $do_coprocessor_error | |
1da177e4 | 821 | jmp error_code |
fe7cacc1 | 822 | CFI_ENDPROC |
47a55cd7 | 823 | END(coprocessor_error) |
1da177e4 LT |
824 | |
825 | ENTRY(simd_coprocessor_error) | |
fe7cacc1 | 826 | RING0_INT_FRAME |
e59d1b0a | 827 | ASM_CLAC |
df5d1874 | 828 | pushl_cfi $0 |
40d2e763 BG |
829 | #ifdef CONFIG_X86_INVD_BUG |
830 | /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ | |
df5d1874 | 831 | 661: pushl_cfi $do_general_protection |
40d2e763 BG |
832 | 662: |
833 | .section .altinstructions,"a" | |
b4ca46e4 | 834 | altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f |
40d2e763 BG |
835 | .previous |
836 | .section .altinstr_replacement,"ax" | |
837 | 663: pushl $do_simd_coprocessor_error | |
838 | 664: | |
839 | .previous | |
840 | #else | |
df5d1874 | 841 | pushl_cfi $do_simd_coprocessor_error |
40d2e763 | 842 | #endif |
1da177e4 | 843 | jmp error_code |
fe7cacc1 | 844 | CFI_ENDPROC |
47a55cd7 | 845 | END(simd_coprocessor_error) |
1da177e4 LT |
846 | |
847 | ENTRY(device_not_available) | |
fe7cacc1 | 848 | RING0_INT_FRAME |
e59d1b0a | 849 | ASM_CLAC |
df5d1874 JB |
850 | pushl_cfi $-1 # mark this as an int |
851 | pushl_cfi $do_device_not_available | |
7643e9b9 | 852 | jmp error_code |
fe7cacc1 | 853 | CFI_ENDPROC |
47a55cd7 | 854 | END(device_not_available) |
1da177e4 | 855 | |
d3561b7f RR |
856 | #ifdef CONFIG_PARAVIRT |
857 | ENTRY(native_iret) | |
3701d863 | 858 | iret |
6837a54d | 859 | _ASM_EXTABLE(native_iret, iret_exc) |
47a55cd7 | 860 | END(native_iret) |
d3561b7f | 861 | |
d75cd22f | 862 | ENTRY(native_irq_enable_sysexit) |
d3561b7f RR |
863 | sti |
864 | sysexit | |
d75cd22f | 865 | END(native_irq_enable_sysexit) |
d3561b7f RR |
866 | #endif |
867 | ||
1da177e4 | 868 | ENTRY(overflow) |
fe7cacc1 | 869 | RING0_INT_FRAME |
e59d1b0a | 870 | ASM_CLAC |
df5d1874 JB |
871 | pushl_cfi $0 |
872 | pushl_cfi $do_overflow | |
1da177e4 | 873 | jmp error_code |
fe7cacc1 | 874 | CFI_ENDPROC |
47a55cd7 | 875 | END(overflow) |
1da177e4 LT |
876 | |
877 | ENTRY(bounds) | |
fe7cacc1 | 878 | RING0_INT_FRAME |
e59d1b0a | 879 | ASM_CLAC |
df5d1874 JB |
880 | pushl_cfi $0 |
881 | pushl_cfi $do_bounds | |
1da177e4 | 882 | jmp error_code |
fe7cacc1 | 883 | CFI_ENDPROC |
47a55cd7 | 884 | END(bounds) |
1da177e4 LT |
885 | |
886 | ENTRY(invalid_op) | |
fe7cacc1 | 887 | RING0_INT_FRAME |
e59d1b0a | 888 | ASM_CLAC |
df5d1874 JB |
889 | pushl_cfi $0 |
890 | pushl_cfi $do_invalid_op | |
1da177e4 | 891 | jmp error_code |
fe7cacc1 | 892 | CFI_ENDPROC |
47a55cd7 | 893 | END(invalid_op) |
1da177e4 LT |
894 | |
895 | ENTRY(coprocessor_segment_overrun) | |
fe7cacc1 | 896 | RING0_INT_FRAME |
e59d1b0a | 897 | ASM_CLAC |
df5d1874 JB |
898 | pushl_cfi $0 |
899 | pushl_cfi $do_coprocessor_segment_overrun | |
1da177e4 | 900 | jmp error_code |
fe7cacc1 | 901 | CFI_ENDPROC |
47a55cd7 | 902 | END(coprocessor_segment_overrun) |
1da177e4 LT |
903 | |
904 | ENTRY(invalid_TSS) | |
fe7cacc1 | 905 | RING0_EC_FRAME |
e59d1b0a | 906 | ASM_CLAC |
df5d1874 | 907 | pushl_cfi $do_invalid_TSS |
1da177e4 | 908 | jmp error_code |
fe7cacc1 | 909 | CFI_ENDPROC |
47a55cd7 | 910 | END(invalid_TSS) |
1da177e4 LT |
911 | |
912 | ENTRY(segment_not_present) | |
fe7cacc1 | 913 | RING0_EC_FRAME |
e59d1b0a | 914 | ASM_CLAC |
df5d1874 | 915 | pushl_cfi $do_segment_not_present |
1da177e4 | 916 | jmp error_code |
fe7cacc1 | 917 | CFI_ENDPROC |
47a55cd7 | 918 | END(segment_not_present) |
1da177e4 LT |
919 | |
920 | ENTRY(stack_segment) | |
fe7cacc1 | 921 | RING0_EC_FRAME |
e59d1b0a | 922 | ASM_CLAC |
df5d1874 | 923 | pushl_cfi $do_stack_segment |
1da177e4 | 924 | jmp error_code |
fe7cacc1 | 925 | CFI_ENDPROC |
47a55cd7 | 926 | END(stack_segment) |
1da177e4 | 927 | |
1da177e4 | 928 | ENTRY(alignment_check) |
fe7cacc1 | 929 | RING0_EC_FRAME |
e59d1b0a | 930 | ASM_CLAC |
df5d1874 | 931 | pushl_cfi $do_alignment_check |
1da177e4 | 932 | jmp error_code |
fe7cacc1 | 933 | CFI_ENDPROC |
47a55cd7 | 934 | END(alignment_check) |
1da177e4 | 935 | |
d28c4393 P |
936 | ENTRY(divide_error) |
937 | RING0_INT_FRAME | |
e59d1b0a | 938 | ASM_CLAC |
df5d1874 JB |
939 | pushl_cfi $0 # no error code |
940 | pushl_cfi $do_divide_error | |
1da177e4 | 941 | jmp error_code |
fe7cacc1 | 942 | CFI_ENDPROC |
47a55cd7 | 943 | END(divide_error) |
1da177e4 LT |
944 | |
945 | #ifdef CONFIG_X86_MCE | |
946 | ENTRY(machine_check) | |
fe7cacc1 | 947 | RING0_INT_FRAME |
e59d1b0a | 948 | ASM_CLAC |
df5d1874 JB |
949 | pushl_cfi $0 |
950 | pushl_cfi machine_check_vector | |
1da177e4 | 951 | jmp error_code |
fe7cacc1 | 952 | CFI_ENDPROC |
47a55cd7 | 953 | END(machine_check) |
1da177e4 LT |
954 | #endif |
955 | ||
956 | ENTRY(spurious_interrupt_bug) | |
fe7cacc1 | 957 | RING0_INT_FRAME |
e59d1b0a | 958 | ASM_CLAC |
df5d1874 JB |
959 | pushl_cfi $0 |
960 | pushl_cfi $do_spurious_interrupt_bug | |
1da177e4 | 961 | jmp error_code |
fe7cacc1 | 962 | CFI_ENDPROC |
47a55cd7 | 963 | END(spurious_interrupt_bug) |
a00e817f MH |
964 | /* |
965 | * End of kprobes section | |
966 | */ | |
967 | .popsection | |
1da177e4 | 968 | |
5ead97c8 | 969 | #ifdef CONFIG_XEN |
e2a81baf JF |
970 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
971 | entrypoint expects, so fix it up before using the normal path. */ | |
972 | ENTRY(xen_sysenter_target) | |
973 | RING0_INT_FRAME | |
974 | addl $5*4, %esp /* remove xen-provided frame */ | |
2ddf9b7b | 975 | CFI_ADJUST_CFA_OFFSET -5*4 |
e2a81baf | 976 | jmp sysenter_past_esp |
557d7d4e | 977 | CFI_ENDPROC |
e2a81baf | 978 | |
5ead97c8 JF |
979 | ENTRY(xen_hypervisor_callback) |
980 | CFI_STARTPROC | |
a349e23d | 981 | pushl_cfi $-1 /* orig_ax = -1 => not a system call */ |
5ead97c8 JF |
982 | SAVE_ALL |
983 | TRACE_IRQS_OFF | |
9ec2b804 JF |
984 | |
985 | /* Check to see if we got the event in the critical | |
986 | region in xen_iret_direct, after we've reenabled | |
987 | events and checked for pending events. This simulates | |
988 | iret instruction's behaviour where it delivers a | |
989 | pending interrupt when enabling interrupts. */ | |
990 | movl PT_EIP(%esp),%eax | |
991 | cmpl $xen_iret_start_crit,%eax | |
992 | jb 1f | |
993 | cmpl $xen_iret_end_crit,%eax | |
994 | jae 1f | |
995 | ||
0f2c8769 | 996 | jmp xen_iret_crit_fixup |
e2a81baf | 997 | |
e2a81baf | 998 | ENTRY(xen_do_upcall) |
b77797fb | 999 | 1: mov %esp, %eax |
5ead97c8 JF |
1000 | call xen_evtchn_do_upcall |
1001 | jmp ret_from_intr | |
1002 | CFI_ENDPROC | |
1003 | ENDPROC(xen_hypervisor_callback) | |
1004 | ||
1005 | # Hypervisor uses this for application faults while it executes. | |
1006 | # We get here for two reasons: | |
1007 | # 1. Fault while reloading DS, ES, FS or GS | |
1008 | # 2. Fault while executing IRET | |
1009 | # Category 1 we fix up by reattempting the load, and zeroing the segment | |
1010 | # register if the load fails. | |
1011 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the | |
1012 | # normal Linux return path in this case because if we use the IRET hypercall | |
1013 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1014 | # We distinguish between categories by maintaining a status value in EAX. | |
1015 | ENTRY(xen_failsafe_callback) | |
1016 | CFI_STARTPROC | |
df5d1874 | 1017 | pushl_cfi %eax |
5ead97c8 JF |
1018 | movl $1,%eax |
1019 | 1: mov 4(%esp),%ds | |
1020 | 2: mov 8(%esp),%es | |
1021 | 3: mov 12(%esp),%fs | |
1022 | 4: mov 16(%esp),%gs | |
a349e23d DV |
1023 | /* EAX == 0 => Category 1 (Bad segment) |
1024 | EAX != 0 => Category 2 (Bad IRET) */ | |
5ead97c8 | 1025 | testl %eax,%eax |
df5d1874 | 1026 | popl_cfi %eax |
5ead97c8 JF |
1027 | lea 16(%esp),%esp |
1028 | CFI_ADJUST_CFA_OFFSET -16 | |
1029 | jz 5f | |
a349e23d DV |
1030 | jmp iret_exc |
1031 | 5: pushl_cfi $-1 /* orig_ax = -1 => not a system call */ | |
5ead97c8 JF |
1032 | SAVE_ALL |
1033 | jmp ret_from_exception | |
1034 | CFI_ENDPROC | |
1035 | ||
1036 | .section .fixup,"ax" | |
1037 | 6: xorl %eax,%eax | |
1038 | movl %eax,4(%esp) | |
1039 | jmp 1b | |
1040 | 7: xorl %eax,%eax | |
1041 | movl %eax,8(%esp) | |
1042 | jmp 2b | |
1043 | 8: xorl %eax,%eax | |
1044 | movl %eax,12(%esp) | |
1045 | jmp 3b | |
1046 | 9: xorl %eax,%eax | |
1047 | movl %eax,16(%esp) | |
1048 | jmp 4b | |
1049 | .previous | |
6837a54d PA |
1050 | _ASM_EXTABLE(1b,6b) |
1051 | _ASM_EXTABLE(2b,7b) | |
1052 | _ASM_EXTABLE(3b,8b) | |
1053 | _ASM_EXTABLE(4b,9b) | |
5ead97c8 JF |
1054 | ENDPROC(xen_failsafe_callback) |
1055 | ||
bc2b0331 | 1056 | BUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR, |
38e20b07 SY |
1057 | xen_evtchn_do_upcall) |
1058 | ||
5ead97c8 | 1059 | #endif /* CONFIG_XEN */ |
bc2b0331 S |
1060 | |
1061 | #if IS_ENABLED(CONFIG_HYPERV) | |
1062 | ||
1063 | BUILD_INTERRUPT3(hyperv_callback_vector, HYPERVISOR_CALLBACK_VECTOR, | |
1064 | hyperv_vector_handler) | |
1065 | ||
1066 | #endif /* CONFIG_HYPERV */ | |
5ead97c8 | 1067 | |
606576ce | 1068 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
1069 | #ifdef CONFIG_DYNAMIC_FTRACE |
1070 | ||
1071 | ENTRY(mcount) | |
d61f82d0 SR |
1072 | ret |
1073 | END(mcount) | |
1074 | ||
1075 | ENTRY(ftrace_caller) | |
60a7ecf4 SR |
1076 | cmpl $0, function_trace_stop |
1077 | jne ftrace_stub | |
1078 | ||
d61f82d0 SR |
1079 | pushl %eax |
1080 | pushl %ecx | |
1081 | pushl %edx | |
08f6fba5 SR |
1082 | pushl $0 /* Pass NULL as regs pointer */ |
1083 | movl 4*4(%esp), %eax | |
d61f82d0 | 1084 | movl 0x4(%ebp), %edx |
1739f09e | 1085 | movl function_trace_op, %ecx |
395a59d0 | 1086 | subl $MCOUNT_INSN_SIZE, %eax |
d61f82d0 SR |
1087 | |
1088 | .globl ftrace_call | |
1089 | ftrace_call: | |
1090 | call ftrace_stub | |
1091 | ||
08f6fba5 | 1092 | addl $4,%esp /* skip NULL pointer */ |
d61f82d0 SR |
1093 | popl %edx |
1094 | popl %ecx | |
1095 | popl %eax | |
4de72395 | 1096 | ftrace_ret: |
5a45cfe1 SR |
1097 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1098 | .globl ftrace_graph_call | |
1099 | ftrace_graph_call: | |
1100 | jmp ftrace_stub | |
1101 | #endif | |
d61f82d0 SR |
1102 | |
1103 | .globl ftrace_stub | |
1104 | ftrace_stub: | |
1105 | ret | |
1106 | END(ftrace_caller) | |
1107 | ||
4de72395 SR |
1108 | ENTRY(ftrace_regs_caller) |
1109 | pushf /* push flags before compare (in cs location) */ | |
1110 | cmpl $0, function_trace_stop | |
1111 | jne ftrace_restore_flags | |
1112 | ||
1113 | /* | |
1114 | * i386 does not save SS and ESP when coming from kernel. | |
1115 | * Instead, to get sp, ®s->sp is used (see ptrace.h). | |
1116 | * Unfortunately, that means eflags must be at the same location | |
1117 | * as the current return ip is. We move the return ip into the | |
1118 | * ip location, and move flags into the return ip location. | |
1119 | */ | |
1120 | pushl 4(%esp) /* save return ip into ip slot */ | |
4de72395 SR |
1121 | |
1122 | pushl $0 /* Load 0 into orig_ax */ | |
1123 | pushl %gs | |
1124 | pushl %fs | |
1125 | pushl %es | |
1126 | pushl %ds | |
1127 | pushl %eax | |
1128 | pushl %ebp | |
1129 | pushl %edi | |
1130 | pushl %esi | |
1131 | pushl %edx | |
1132 | pushl %ecx | |
1133 | pushl %ebx | |
1134 | ||
1135 | movl 13*4(%esp), %eax /* Get the saved flags */ | |
1136 | movl %eax, 14*4(%esp) /* Move saved flags into regs->flags location */ | |
1137 | /* clobbering return ip */ | |
1138 | movl $__KERNEL_CS,13*4(%esp) | |
1139 | ||
1140 | movl 12*4(%esp), %eax /* Load ip (1st parameter) */ | |
a5e37863 | 1141 | subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */ |
e4ea3f6b | 1142 | movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ |
1739f09e | 1143 | movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ |
e4ea3f6b | 1144 | pushl %esp /* Save pt_regs as 4th parameter */ |
4de72395 SR |
1145 | |
1146 | GLOBAL(ftrace_regs_call) | |
1147 | call ftrace_stub | |
1148 | ||
1149 | addl $4, %esp /* Skip pt_regs */ | |
1150 | movl 14*4(%esp), %eax /* Move flags back into cs */ | |
1151 | movl %eax, 13*4(%esp) /* Needed to keep addl from modifying flags */ | |
1152 | movl 12*4(%esp), %eax /* Get return ip from regs->ip */ | |
4de72395 SR |
1153 | movl %eax, 14*4(%esp) /* Put return ip back for ret */ |
1154 | ||
1155 | popl %ebx | |
1156 | popl %ecx | |
1157 | popl %edx | |
1158 | popl %esi | |
1159 | popl %edi | |
1160 | popl %ebp | |
1161 | popl %eax | |
1162 | popl %ds | |
1163 | popl %es | |
1164 | popl %fs | |
1165 | popl %gs | |
1166 | addl $8, %esp /* Skip orig_ax and ip */ | |
1167 | popf /* Pop flags at end (no addl to corrupt flags) */ | |
1168 | jmp ftrace_ret | |
1169 | ||
1170 | ftrace_restore_flags: | |
1171 | popf | |
1172 | jmp ftrace_stub | |
d61f82d0 SR |
1173 | #else /* ! CONFIG_DYNAMIC_FTRACE */ |
1174 | ||
16444a8a | 1175 | ENTRY(mcount) |
af058ab0 PA |
1176 | cmpl $__PAGE_OFFSET, %esp |
1177 | jb ftrace_stub /* Paging not enabled yet? */ | |
1178 | ||
60a7ecf4 SR |
1179 | cmpl $0, function_trace_stop |
1180 | jne ftrace_stub | |
1181 | ||
16444a8a ACM |
1182 | cmpl $ftrace_stub, ftrace_trace_function |
1183 | jnz trace | |
fb52607a | 1184 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
c2324b69 | 1185 | cmpl $ftrace_stub, ftrace_graph_return |
fb52607a | 1186 | jnz ftrace_graph_caller |
e49dc19c SR |
1187 | |
1188 | cmpl $ftrace_graph_entry_stub, ftrace_graph_entry | |
1189 | jnz ftrace_graph_caller | |
caf4b323 | 1190 | #endif |
16444a8a ACM |
1191 | .globl ftrace_stub |
1192 | ftrace_stub: | |
1193 | ret | |
1194 | ||
1195 | /* taken from glibc */ | |
1196 | trace: | |
1197 | pushl %eax | |
1198 | pushl %ecx | |
1199 | pushl %edx | |
1200 | movl 0xc(%esp), %eax | |
1201 | movl 0x4(%ebp), %edx | |
395a59d0 | 1202 | subl $MCOUNT_INSN_SIZE, %eax |
16444a8a | 1203 | |
d61f82d0 | 1204 | call *ftrace_trace_function |
16444a8a ACM |
1205 | |
1206 | popl %edx | |
1207 | popl %ecx | |
1208 | popl %eax | |
16444a8a ACM |
1209 | jmp ftrace_stub |
1210 | END(mcount) | |
d61f82d0 | 1211 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 1212 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 1213 | |
fb52607a FW |
1214 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1215 | ENTRY(ftrace_graph_caller) | |
caf4b323 FW |
1216 | pushl %eax |
1217 | pushl %ecx | |
1218 | pushl %edx | |
1dc1c6ad | 1219 | movl 0xc(%esp), %edx |
caf4b323 | 1220 | lea 0x4(%ebp), %eax |
71e308a2 | 1221 | movl (%ebp), %ecx |
bb4304c7 | 1222 | subl $MCOUNT_INSN_SIZE, %edx |
caf4b323 | 1223 | call prepare_ftrace_return |
caf4b323 FW |
1224 | popl %edx |
1225 | popl %ecx | |
1226 | popl %eax | |
e7d3737e | 1227 | ret |
fb52607a | 1228 | END(ftrace_graph_caller) |
caf4b323 FW |
1229 | |
1230 | .globl return_to_handler | |
1231 | return_to_handler: | |
caf4b323 | 1232 | pushl %eax |
caf4b323 | 1233 | pushl %edx |
71e308a2 | 1234 | movl %ebp, %eax |
caf4b323 | 1235 | call ftrace_return_to_handler |
194ec341 | 1236 | movl %eax, %ecx |
caf4b323 | 1237 | popl %edx |
caf4b323 | 1238 | popl %eax |
194ec341 | 1239 | jmp *%ecx |
e7d3737e | 1240 | #endif |
16444a8a | 1241 | |
d211af05 AH |
1242 | /* |
1243 | * Some functions should be protected against kprobes | |
1244 | */ | |
1245 | .pushsection .kprobes.text, "ax" | |
1246 | ||
25c74b10 SA |
1247 | #ifdef CONFIG_TRACING |
1248 | ENTRY(trace_page_fault) | |
1249 | RING0_EC_FRAME | |
1250 | ASM_CLAC | |
1251 | pushl_cfi $trace_do_page_fault | |
1252 | jmp error_code | |
1253 | CFI_ENDPROC | |
1254 | END(trace_page_fault) | |
1255 | #endif | |
1256 | ||
d211af05 AH |
1257 | ENTRY(page_fault) |
1258 | RING0_EC_FRAME | |
e59d1b0a | 1259 | ASM_CLAC |
df5d1874 | 1260 | pushl_cfi $do_page_fault |
d211af05 AH |
1261 | ALIGN |
1262 | error_code: | |
ccbeed3a | 1263 | /* the function address is in %gs's slot on the stack */ |
df5d1874 | 1264 | pushl_cfi %fs |
ccbeed3a | 1265 | /*CFI_REL_OFFSET fs, 0*/ |
df5d1874 | 1266 | pushl_cfi %es |
d211af05 | 1267 | /*CFI_REL_OFFSET es, 0*/ |
df5d1874 | 1268 | pushl_cfi %ds |
d211af05 | 1269 | /*CFI_REL_OFFSET ds, 0*/ |
df5d1874 | 1270 | pushl_cfi %eax |
d211af05 | 1271 | CFI_REL_OFFSET eax, 0 |
df5d1874 | 1272 | pushl_cfi %ebp |
d211af05 | 1273 | CFI_REL_OFFSET ebp, 0 |
df5d1874 | 1274 | pushl_cfi %edi |
d211af05 | 1275 | CFI_REL_OFFSET edi, 0 |
df5d1874 | 1276 | pushl_cfi %esi |
d211af05 | 1277 | CFI_REL_OFFSET esi, 0 |
df5d1874 | 1278 | pushl_cfi %edx |
d211af05 | 1279 | CFI_REL_OFFSET edx, 0 |
df5d1874 | 1280 | pushl_cfi %ecx |
d211af05 | 1281 | CFI_REL_OFFSET ecx, 0 |
df5d1874 | 1282 | pushl_cfi %ebx |
d211af05 AH |
1283 | CFI_REL_OFFSET ebx, 0 |
1284 | cld | |
d211af05 AH |
1285 | movl $(__KERNEL_PERCPU), %ecx |
1286 | movl %ecx, %fs | |
1287 | UNWIND_ESPFIX_STACK | |
ccbeed3a TH |
1288 | GS_TO_REG %ecx |
1289 | movl PT_GS(%esp), %edi # get the function address | |
d211af05 AH |
1290 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
1291 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart | |
ccbeed3a TH |
1292 | REG_TO_PTGS %ecx |
1293 | SET_KERNEL_GS %ecx | |
d211af05 AH |
1294 | movl $(__USER_DS), %ecx |
1295 | movl %ecx, %ds | |
1296 | movl %ecx, %es | |
1297 | TRACE_IRQS_OFF | |
1298 | movl %esp,%eax # pt_regs pointer | |
1299 | call *%edi | |
1300 | jmp ret_from_exception | |
1301 | CFI_ENDPROC | |
1302 | END(page_fault) | |
1303 | ||
1304 | /* | |
1305 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
1306 | * that sets up the real kernel stack. Check here, since we can't | |
1307 | * allow the wrong stack to be used. | |
1308 | * | |
1309 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have | |
1310 | * already pushed 3 words if it hits on the sysenter instruction: | |
1311 | * eflags, cs and eip. | |
1312 | * | |
1313 | * We just load the right stack, and push the three (known) values | |
1314 | * by hand onto the new stack - while updating the return eip past | |
1315 | * the instruction that would have done it for sysenter. | |
1316 | */ | |
f0d96110 TH |
1317 | .macro FIX_STACK offset ok label |
1318 | cmpw $__KERNEL_CS, 4(%esp) | |
1319 | jne \ok | |
1320 | \label: | |
1321 | movl TSS_sysenter_sp0 + \offset(%esp), %esp | |
1322 | CFI_DEF_CFA esp, 0 | |
1323 | CFI_UNDEFINED eip | |
df5d1874 JB |
1324 | pushfl_cfi |
1325 | pushl_cfi $__KERNEL_CS | |
1326 | pushl_cfi $sysenter_past_esp | |
d211af05 | 1327 | CFI_REL_OFFSET eip, 0 |
f0d96110 | 1328 | .endm |
d211af05 AH |
1329 | |
1330 | ENTRY(debug) | |
1331 | RING0_INT_FRAME | |
e59d1b0a | 1332 | ASM_CLAC |
d211af05 AH |
1333 | cmpl $ia32_sysenter_target,(%esp) |
1334 | jne debug_stack_correct | |
f0d96110 | 1335 | FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn |
d211af05 | 1336 | debug_stack_correct: |
df5d1874 | 1337 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1338 | SAVE_ALL |
1339 | TRACE_IRQS_OFF | |
1340 | xorl %edx,%edx # error code 0 | |
1341 | movl %esp,%eax # pt_regs pointer | |
1342 | call do_debug | |
1343 | jmp ret_from_exception | |
1344 | CFI_ENDPROC | |
1345 | END(debug) | |
1346 | ||
1347 | /* | |
1348 | * NMI is doubly nasty. It can happen _while_ we're handling | |
1349 | * a debug fault, and the debug fault hasn't yet been able to | |
1350 | * clear up the stack. So we first check whether we got an | |
1351 | * NMI on the sysenter entry path, but after that we need to | |
1352 | * check whether we got an NMI on the debug path where the debug | |
1353 | * fault happened on the sysenter path. | |
1354 | */ | |
1355 | ENTRY(nmi) | |
1356 | RING0_INT_FRAME | |
e59d1b0a | 1357 | ASM_CLAC |
df5d1874 | 1358 | pushl_cfi %eax |
d211af05 AH |
1359 | movl %ss, %eax |
1360 | cmpw $__ESPFIX_SS, %ax | |
df5d1874 | 1361 | popl_cfi %eax |
d211af05 AH |
1362 | je nmi_espfix_stack |
1363 | cmpl $ia32_sysenter_target,(%esp) | |
1364 | je nmi_stack_fixup | |
df5d1874 | 1365 | pushl_cfi %eax |
d211af05 AH |
1366 | movl %esp,%eax |
1367 | /* Do not access memory above the end of our stack page, | |
1368 | * it might not exist. | |
1369 | */ | |
1370 | andl $(THREAD_SIZE-1),%eax | |
1371 | cmpl $(THREAD_SIZE-20),%eax | |
df5d1874 | 1372 | popl_cfi %eax |
d211af05 AH |
1373 | jae nmi_stack_correct |
1374 | cmpl $ia32_sysenter_target,12(%esp) | |
1375 | je nmi_debug_stack_check | |
1376 | nmi_stack_correct: | |
1377 | /* We have a RING0_INT_FRAME here */ | |
df5d1874 | 1378 | pushl_cfi %eax |
d211af05 | 1379 | SAVE_ALL |
d211af05 AH |
1380 | xorl %edx,%edx # zero error code |
1381 | movl %esp,%eax # pt_regs pointer | |
1382 | call do_nmi | |
2e04bc76 | 1383 | jmp restore_all_notrace |
d211af05 AH |
1384 | CFI_ENDPROC |
1385 | ||
1386 | nmi_stack_fixup: | |
1387 | RING0_INT_FRAME | |
f0d96110 | 1388 | FIX_STACK 12, nmi_stack_correct, 1 |
d211af05 AH |
1389 | jmp nmi_stack_correct |
1390 | ||
1391 | nmi_debug_stack_check: | |
1392 | /* We have a RING0_INT_FRAME here */ | |
1393 | cmpw $__KERNEL_CS,16(%esp) | |
1394 | jne nmi_stack_correct | |
1395 | cmpl $debug,(%esp) | |
1396 | jb nmi_stack_correct | |
1397 | cmpl $debug_esp_fix_insn,(%esp) | |
1398 | ja nmi_stack_correct | |
f0d96110 | 1399 | FIX_STACK 24, nmi_stack_correct, 1 |
d211af05 AH |
1400 | jmp nmi_stack_correct |
1401 | ||
1402 | nmi_espfix_stack: | |
1403 | /* We have a RING0_INT_FRAME here. | |
1404 | * | |
1405 | * create the pointer to lss back | |
1406 | */ | |
df5d1874 JB |
1407 | pushl_cfi %ss |
1408 | pushl_cfi %esp | |
bda3a897 | 1409 | addl $4, (%esp) |
d211af05 AH |
1410 | /* copy the iret frame of 12 bytes */ |
1411 | .rept 3 | |
df5d1874 | 1412 | pushl_cfi 16(%esp) |
d211af05 | 1413 | .endr |
df5d1874 | 1414 | pushl_cfi %eax |
d211af05 | 1415 | SAVE_ALL |
d211af05 AH |
1416 | FIXUP_ESPFIX_STACK # %eax == %esp |
1417 | xorl %edx,%edx # zero error code | |
1418 | call do_nmi | |
1419 | RESTORE_REGS | |
1420 | lss 12+4(%esp), %esp # back to espfix stack | |
1421 | CFI_ADJUST_CFA_OFFSET -24 | |
1422 | jmp irq_return | |
1423 | CFI_ENDPROC | |
1424 | END(nmi) | |
1425 | ||
1426 | ENTRY(int3) | |
1427 | RING0_INT_FRAME | |
e59d1b0a | 1428 | ASM_CLAC |
df5d1874 | 1429 | pushl_cfi $-1 # mark this as an int |
d211af05 AH |
1430 | SAVE_ALL |
1431 | TRACE_IRQS_OFF | |
1432 | xorl %edx,%edx # zero error code | |
1433 | movl %esp,%eax # pt_regs pointer | |
1434 | call do_int3 | |
1435 | jmp ret_from_exception | |
1436 | CFI_ENDPROC | |
1437 | END(int3) | |
1438 | ||
1439 | ENTRY(general_protection) | |
1440 | RING0_EC_FRAME | |
df5d1874 | 1441 | pushl_cfi $do_general_protection |
d211af05 AH |
1442 | jmp error_code |
1443 | CFI_ENDPROC | |
1444 | END(general_protection) | |
1445 | ||
631bc487 GN |
1446 | #ifdef CONFIG_KVM_GUEST |
1447 | ENTRY(async_page_fault) | |
1448 | RING0_EC_FRAME | |
e59d1b0a | 1449 | ASM_CLAC |
60cf637a | 1450 | pushl_cfi $do_async_page_fault |
631bc487 GN |
1451 | jmp error_code |
1452 | CFI_ENDPROC | |
2ae9d293 | 1453 | END(async_page_fault) |
631bc487 GN |
1454 | #endif |
1455 | ||
d211af05 AH |
1456 | /* |
1457 | * End of kprobes section | |
1458 | */ | |
1459 | .popsection |