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 LT |
44 | #include <linux/linkage.h> |
45 | #include <asm/thread_info.h> | |
55f327fa | 46 | #include <asm/irqflags.h> |
1da177e4 LT |
47 | #include <asm/errno.h> |
48 | #include <asm/segment.h> | |
49 | #include <asm/smp.h> | |
0341c14d | 50 | #include <asm/page_types.h> |
be44d2aa | 51 | #include <asm/percpu.h> |
fe7cacc1 | 52 | #include <asm/dwarf2.h> |
ab68ed98 | 53 | #include <asm/processor-flags.h> |
395a59d0 | 54 | #include <asm/ftrace.h> |
9b7dc567 | 55 | #include <asm/irq_vectors.h> |
40d2e763 | 56 | #include <asm/cpufeature.h> |
1da177e4 | 57 | |
af0575bb RM |
58 | /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
59 | #include <linux/elf-em.h> | |
60 | #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) | |
61 | #define __AUDIT_ARCH_LE 0x40000000 | |
62 | ||
63 | #ifndef CONFIG_AUDITSYSCALL | |
64 | #define sysenter_audit syscall_trace_entry | |
65 | #define sysexit_audit syscall_exit_work | |
66 | #endif | |
67 | ||
139ec7c4 RR |
68 | /* |
69 | * We use macros for low-level operations which need to be overridden | |
70 | * for paravirtualization. The following will never clobber any registers: | |
71 | * INTERRUPT_RETURN (aka. "iret") | |
72 | * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax") | |
d75cd22f | 73 | * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit"). |
139ec7c4 RR |
74 | * |
75 | * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must | |
76 | * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY). | |
77 | * Allowing a register to be clobbered can shrink the paravirt replacement | |
78 | * enough to patch inline, increasing performance. | |
79 | */ | |
80 | ||
1da177e4 LT |
81 | #define nr_syscalls ((syscall_table_size)/4) |
82 | ||
1da177e4 | 83 | #ifdef CONFIG_PREEMPT |
139ec7c4 | 84 | #define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF |
1da177e4 | 85 | #else |
139ec7c4 | 86 | #define preempt_stop(clobbers) |
2e04bc76 | 87 | #define resume_kernel restore_all |
1da177e4 LT |
88 | #endif |
89 | ||
55f327fa IM |
90 | .macro TRACE_IRQS_IRET |
91 | #ifdef CONFIG_TRACE_IRQFLAGS | |
ab68ed98 | 92 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off? |
55f327fa IM |
93 | jz 1f |
94 | TRACE_IRQS_ON | |
95 | 1: | |
96 | #endif | |
97 | .endm | |
98 | ||
4031ff38 AG |
99 | #ifdef CONFIG_VM86 |
100 | #define resume_userspace_sig check_userspace | |
101 | #else | |
102 | #define resume_userspace_sig resume_userspace | |
103 | #endif | |
104 | ||
ccbeed3a TH |
105 | /* |
106 | * User gs save/restore | |
107 | * | |
108 | * %gs is used for userland TLS and kernel only uses it for stack | |
109 | * canary which is required to be at %gs:20 by gcc. Read the comment | |
110 | * at the top of stackprotector.h for more info. | |
111 | * | |
112 | * Local labels 98 and 99 are used. | |
113 | */ | |
114 | #ifdef CONFIG_X86_32_LAZY_GS | |
115 | ||
116 | /* unfortunately push/pop can't be no-op */ | |
117 | .macro PUSH_GS | |
118 | pushl $0 | |
119 | CFI_ADJUST_CFA_OFFSET 4 | |
120 | .endm | |
121 | .macro POP_GS pop=0 | |
122 | addl $(4 + \pop), %esp | |
123 | CFI_ADJUST_CFA_OFFSET -(4 + \pop) | |
124 | .endm | |
125 | .macro POP_GS_EX | |
126 | .endm | |
127 | ||
128 | /* all the rest are no-op */ | |
129 | .macro PTGS_TO_GS | |
130 | .endm | |
131 | .macro PTGS_TO_GS_EX | |
132 | .endm | |
133 | .macro GS_TO_REG reg | |
134 | .endm | |
135 | .macro REG_TO_PTGS reg | |
136 | .endm | |
137 | .macro SET_KERNEL_GS reg | |
138 | .endm | |
139 | ||
140 | #else /* CONFIG_X86_32_LAZY_GS */ | |
141 | ||
142 | .macro PUSH_GS | |
143 | pushl %gs | |
144 | CFI_ADJUST_CFA_OFFSET 4 | |
145 | /*CFI_REL_OFFSET gs, 0*/ | |
146 | .endm | |
147 | ||
148 | .macro POP_GS pop=0 | |
149 | 98: popl %gs | |
150 | CFI_ADJUST_CFA_OFFSET -4 | |
151 | /*CFI_RESTORE gs*/ | |
152 | .if \pop <> 0 | |
153 | add $\pop, %esp | |
154 | CFI_ADJUST_CFA_OFFSET -\pop | |
155 | .endif | |
156 | .endm | |
157 | .macro POP_GS_EX | |
158 | .pushsection .fixup, "ax" | |
159 | 99: movl $0, (%esp) | |
160 | jmp 98b | |
161 | .section __ex_table, "a" | |
162 | .align 4 | |
163 | .long 98b, 99b | |
164 | .popsection | |
165 | .endm | |
166 | ||
167 | .macro PTGS_TO_GS | |
168 | 98: mov PT_GS(%esp), %gs | |
169 | .endm | |
170 | .macro PTGS_TO_GS_EX | |
171 | .pushsection .fixup, "ax" | |
172 | 99: movl $0, PT_GS(%esp) | |
173 | jmp 98b | |
174 | .section __ex_table, "a" | |
175 | .align 4 | |
176 | .long 98b, 99b | |
177 | .popsection | |
178 | .endm | |
179 | ||
180 | .macro GS_TO_REG reg | |
181 | movl %gs, \reg | |
182 | /*CFI_REGISTER gs, \reg*/ | |
183 | .endm | |
184 | .macro REG_TO_PTGS reg | |
185 | movl \reg, PT_GS(%esp) | |
186 | /*CFI_REL_OFFSET gs, PT_GS*/ | |
187 | .endm | |
188 | .macro SET_KERNEL_GS reg | |
60a5317f | 189 | movl $(__KERNEL_STACK_CANARY), \reg |
ccbeed3a TH |
190 | movl \reg, %gs |
191 | .endm | |
192 | ||
193 | #endif /* CONFIG_X86_32_LAZY_GS */ | |
194 | ||
f0d96110 TH |
195 | .macro SAVE_ALL |
196 | cld | |
ccbeed3a | 197 | PUSH_GS |
f0d96110 TH |
198 | pushl %fs |
199 | CFI_ADJUST_CFA_OFFSET 4 | |
200 | /*CFI_REL_OFFSET fs, 0;*/ | |
201 | pushl %es | |
202 | CFI_ADJUST_CFA_OFFSET 4 | |
203 | /*CFI_REL_OFFSET es, 0;*/ | |
204 | pushl %ds | |
205 | CFI_ADJUST_CFA_OFFSET 4 | |
206 | /*CFI_REL_OFFSET ds, 0;*/ | |
207 | pushl %eax | |
208 | CFI_ADJUST_CFA_OFFSET 4 | |
209 | CFI_REL_OFFSET eax, 0 | |
210 | pushl %ebp | |
211 | CFI_ADJUST_CFA_OFFSET 4 | |
212 | CFI_REL_OFFSET ebp, 0 | |
213 | pushl %edi | |
214 | CFI_ADJUST_CFA_OFFSET 4 | |
215 | CFI_REL_OFFSET edi, 0 | |
216 | pushl %esi | |
217 | CFI_ADJUST_CFA_OFFSET 4 | |
218 | CFI_REL_OFFSET esi, 0 | |
219 | pushl %edx | |
220 | CFI_ADJUST_CFA_OFFSET 4 | |
221 | CFI_REL_OFFSET edx, 0 | |
222 | pushl %ecx | |
223 | CFI_ADJUST_CFA_OFFSET 4 | |
224 | CFI_REL_OFFSET ecx, 0 | |
225 | pushl %ebx | |
226 | CFI_ADJUST_CFA_OFFSET 4 | |
227 | CFI_REL_OFFSET ebx, 0 | |
228 | movl $(__USER_DS), %edx | |
229 | movl %edx, %ds | |
230 | movl %edx, %es | |
231 | movl $(__KERNEL_PERCPU), %edx | |
464d1a78 | 232 | movl %edx, %fs |
ccbeed3a | 233 | SET_KERNEL_GS %edx |
f0d96110 | 234 | .endm |
1da177e4 | 235 | |
f0d96110 TH |
236 | .macro RESTORE_INT_REGS |
237 | popl %ebx | |
238 | CFI_ADJUST_CFA_OFFSET -4 | |
239 | CFI_RESTORE ebx | |
240 | popl %ecx | |
241 | CFI_ADJUST_CFA_OFFSET -4 | |
242 | CFI_RESTORE ecx | |
243 | popl %edx | |
244 | CFI_ADJUST_CFA_OFFSET -4 | |
245 | CFI_RESTORE edx | |
246 | popl %esi | |
247 | CFI_ADJUST_CFA_OFFSET -4 | |
248 | CFI_RESTORE esi | |
249 | popl %edi | |
250 | CFI_ADJUST_CFA_OFFSET -4 | |
251 | CFI_RESTORE edi | |
252 | popl %ebp | |
253 | CFI_ADJUST_CFA_OFFSET -4 | |
254 | CFI_RESTORE ebp | |
255 | popl %eax | |
256 | CFI_ADJUST_CFA_OFFSET -4 | |
fe7cacc1 | 257 | CFI_RESTORE eax |
f0d96110 | 258 | .endm |
1da177e4 | 259 | |
ccbeed3a | 260 | .macro RESTORE_REGS pop=0 |
f0d96110 TH |
261 | RESTORE_INT_REGS |
262 | 1: popl %ds | |
263 | CFI_ADJUST_CFA_OFFSET -4 | |
264 | /*CFI_RESTORE ds;*/ | |
265 | 2: popl %es | |
266 | CFI_ADJUST_CFA_OFFSET -4 | |
267 | /*CFI_RESTORE es;*/ | |
268 | 3: popl %fs | |
269 | CFI_ADJUST_CFA_OFFSET -4 | |
270 | /*CFI_RESTORE fs;*/ | |
ccbeed3a | 271 | POP_GS \pop |
f0d96110 TH |
272 | .pushsection .fixup, "ax" |
273 | 4: movl $0, (%esp) | |
274 | jmp 1b | |
275 | 5: movl $0, (%esp) | |
276 | jmp 2b | |
277 | 6: movl $0, (%esp) | |
278 | jmp 3b | |
279 | .section __ex_table, "a" | |
280 | .align 4 | |
281 | .long 1b, 4b | |
282 | .long 2b, 5b | |
283 | .long 3b, 6b | |
f95d47ca | 284 | .popsection |
ccbeed3a | 285 | POP_GS_EX |
f0d96110 | 286 | .endm |
1da177e4 | 287 | |
f0d96110 TH |
288 | .macro RING0_INT_FRAME |
289 | CFI_STARTPROC simple | |
290 | CFI_SIGNAL_FRAME | |
291 | CFI_DEF_CFA esp, 3*4 | |
292 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 293 | CFI_OFFSET eip, -3*4 |
f0d96110 | 294 | .endm |
fe7cacc1 | 295 | |
f0d96110 TH |
296 | .macro RING0_EC_FRAME |
297 | CFI_STARTPROC simple | |
298 | CFI_SIGNAL_FRAME | |
299 | CFI_DEF_CFA esp, 4*4 | |
300 | /*CFI_OFFSET cs, -2*4;*/ | |
fe7cacc1 | 301 | CFI_OFFSET eip, -3*4 |
f0d96110 | 302 | .endm |
fe7cacc1 | 303 | |
f0d96110 TH |
304 | .macro RING0_PTREGS_FRAME |
305 | CFI_STARTPROC simple | |
306 | CFI_SIGNAL_FRAME | |
307 | CFI_DEF_CFA esp, PT_OLDESP-PT_EBX | |
308 | /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/ | |
309 | CFI_OFFSET eip, PT_EIP-PT_OLDESP | |
310 | /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/ | |
311 | /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/ | |
312 | CFI_OFFSET eax, PT_EAX-PT_OLDESP | |
313 | CFI_OFFSET ebp, PT_EBP-PT_OLDESP | |
314 | CFI_OFFSET edi, PT_EDI-PT_OLDESP | |
315 | CFI_OFFSET esi, PT_ESI-PT_OLDESP | |
316 | CFI_OFFSET edx, PT_EDX-PT_OLDESP | |
317 | CFI_OFFSET ecx, PT_ECX-PT_OLDESP | |
eb5b7b9d | 318 | CFI_OFFSET ebx, PT_EBX-PT_OLDESP |
f0d96110 | 319 | .endm |
1da177e4 LT |
320 | |
321 | ENTRY(ret_from_fork) | |
fe7cacc1 | 322 | CFI_STARTPROC |
1da177e4 | 323 | pushl %eax |
25d7dfda | 324 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 LT |
325 | call schedule_tail |
326 | GET_THREAD_INFO(%ebp) | |
327 | popl %eax | |
fe7cacc1 | 328 | CFI_ADJUST_CFA_OFFSET -4 |
47a5c6fa LT |
329 | pushl $0x0202 # Reset kernel eflags |
330 | CFI_ADJUST_CFA_OFFSET 4 | |
331 | popfl | |
332 | CFI_ADJUST_CFA_OFFSET -4 | |
1da177e4 | 333 | jmp syscall_exit |
fe7cacc1 | 334 | CFI_ENDPROC |
47a55cd7 | 335 | END(ret_from_fork) |
1da177e4 | 336 | |
a00e817f MH |
337 | /* |
338 | * Interrupt exit functions should be protected against kprobes | |
339 | */ | |
340 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
341 | /* |
342 | * Return to user mode is not as complex as all this looks, | |
343 | * but we want the default path for a system call return to | |
344 | * go as quickly as possible which is why some of this is | |
345 | * less clear than it otherwise should be. | |
346 | */ | |
347 | ||
348 | # userspace resumption stub bypassing syscall exit tracing | |
349 | ALIGN | |
fe7cacc1 | 350 | RING0_PTREGS_FRAME |
1da177e4 | 351 | ret_from_exception: |
139ec7c4 | 352 | preempt_stop(CLBR_ANY) |
1da177e4 LT |
353 | ret_from_intr: |
354 | GET_THREAD_INFO(%ebp) | |
4031ff38 | 355 | check_userspace: |
eb5b7b9d JF |
356 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
357 | movb PT_CS(%esp), %al | |
ab68ed98 | 358 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
78be3706 RR |
359 | cmpl $USER_RPL, %eax |
360 | jb resume_kernel # not returning to v8086 or userspace | |
f95d47ca | 361 | |
1da177e4 | 362 | ENTRY(resume_userspace) |
c7e872e7 | 363 | LOCKDEP_SYS_EXIT |
139ec7c4 | 364 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
365 | # setting need_resched or sigpending |
366 | # between sampling and the iret | |
e32e58a9 | 367 | TRACE_IRQS_OFF |
1da177e4 LT |
368 | movl TI_flags(%ebp), %ecx |
369 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
370 | # int/exception return? | |
371 | jne work_pending | |
372 | jmp restore_all | |
47a55cd7 | 373 | END(ret_from_exception) |
1da177e4 LT |
374 | |
375 | #ifdef CONFIG_PREEMPT | |
376 | ENTRY(resume_kernel) | |
139ec7c4 | 377 | DISABLE_INTERRUPTS(CLBR_ANY) |
1da177e4 | 378 | cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? |
2e04bc76 | 379 | jnz restore_all |
1da177e4 LT |
380 | need_resched: |
381 | movl TI_flags(%ebp), %ecx # need_resched set ? | |
382 | testb $_TIF_NEED_RESCHED, %cl | |
383 | jz restore_all | |
ab68ed98 | 384 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
1da177e4 LT |
385 | jz restore_all |
386 | call preempt_schedule_irq | |
387 | jmp need_resched | |
47a55cd7 | 388 | END(resume_kernel) |
1da177e4 | 389 | #endif |
fe7cacc1 | 390 | CFI_ENDPROC |
a00e817f MH |
391 | /* |
392 | * End of kprobes section | |
393 | */ | |
394 | .popsection | |
1da177e4 LT |
395 | |
396 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
397 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
398 | ||
399 | # sysenter call handler stub | |
0aa97fb2 | 400 | ENTRY(ia32_sysenter_target) |
fe7cacc1 | 401 | CFI_STARTPROC simple |
adf14236 | 402 | CFI_SIGNAL_FRAME |
fe7cacc1 JB |
403 | CFI_DEF_CFA esp, 0 |
404 | CFI_REGISTER esp, ebp | |
faca6227 | 405 | movl TSS_sysenter_sp0(%esp),%esp |
1da177e4 | 406 | sysenter_past_esp: |
55f327fa | 407 | /* |
d93c870b JF |
408 | * Interrupts are disabled here, but we can't trace it until |
409 | * enough kernel state to call TRACE_IRQS_OFF can be called - but | |
410 | * we immediately enable interrupts at that point anyway. | |
55f327fa | 411 | */ |
1da177e4 | 412 | pushl $(__USER_DS) |
fe7cacc1 JB |
413 | CFI_ADJUST_CFA_OFFSET 4 |
414 | /*CFI_REL_OFFSET ss, 0*/ | |
1da177e4 | 415 | pushl %ebp |
fe7cacc1 JB |
416 | CFI_ADJUST_CFA_OFFSET 4 |
417 | CFI_REL_OFFSET esp, 0 | |
1da177e4 | 418 | pushfl |
d93c870b | 419 | orl $X86_EFLAGS_IF, (%esp) |
fe7cacc1 | 420 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 421 | pushl $(__USER_CS) |
fe7cacc1 JB |
422 | CFI_ADJUST_CFA_OFFSET 4 |
423 | /*CFI_REL_OFFSET cs, 0*/ | |
e6e5494c IM |
424 | /* |
425 | * Push current_thread_info()->sysenter_return to the stack. | |
426 | * A tiny bit of offset fixup is necessary - 4*4 means the 4 words | |
427 | * pushed above; +8 corresponds to copy_thread's esp0 setting. | |
428 | */ | |
429 | pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp) | |
fe7cacc1 JB |
430 | CFI_ADJUST_CFA_OFFSET 4 |
431 | CFI_REL_OFFSET eip, 0 | |
1da177e4 | 432 | |
d93c870b JF |
433 | pushl %eax |
434 | CFI_ADJUST_CFA_OFFSET 4 | |
435 | SAVE_ALL | |
436 | ENABLE_INTERRUPTS(CLBR_NONE) | |
437 | ||
1da177e4 LT |
438 | /* |
439 | * Load the potential sixth argument from user stack. | |
440 | * Careful about security. | |
441 | */ | |
442 | cmpl $__PAGE_OFFSET-3,%ebp | |
443 | jae syscall_fault | |
444 | 1: movl (%ebp),%ebp | |
d93c870b | 445 | movl %ebp,PT_EBP(%esp) |
1da177e4 LT |
446 | .section __ex_table,"a" |
447 | .align 4 | |
448 | .long 1b,syscall_fault | |
449 | .previous | |
450 | ||
1da177e4 LT |
451 | GET_THREAD_INFO(%ebp) |
452 | ||
88200bc2 | 453 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
af0575bb RM |
454 | jnz sysenter_audit |
455 | sysenter_do_call: | |
1da177e4 LT |
456 | cmpl $(nr_syscalls), %eax |
457 | jae syscall_badsys | |
458 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 459 | movl %eax,PT_EAX(%esp) |
c7e872e7 | 460 | LOCKDEP_SYS_EXIT |
42c24fa2 | 461 | DISABLE_INTERRUPTS(CLBR_ANY) |
55f327fa | 462 | TRACE_IRQS_OFF |
1da177e4 | 463 | movl TI_flags(%ebp), %ecx |
88200bc2 | 464 | testl $_TIF_ALLWORK_MASK, %ecx |
af0575bb RM |
465 | jne sysexit_audit |
466 | sysenter_exit: | |
1da177e4 | 467 | /* if something modifies registers it must also disable sysexit */ |
eb5b7b9d JF |
468 | movl PT_EIP(%esp), %edx |
469 | movl PT_OLDESP(%esp), %ecx | |
1da177e4 | 470 | xorl %ebp,%ebp |
55f327fa | 471 | TRACE_IRQS_ON |
464d1a78 | 472 | 1: mov PT_FS(%esp), %fs |
ccbeed3a | 473 | PTGS_TO_GS |
d75cd22f | 474 | ENABLE_INTERRUPTS_SYSEXIT |
af0575bb RM |
475 | |
476 | #ifdef CONFIG_AUDITSYSCALL | |
477 | sysenter_audit: | |
88200bc2 | 478 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
af0575bb RM |
479 | jnz syscall_trace_entry |
480 | addl $4,%esp | |
481 | CFI_ADJUST_CFA_OFFSET -4 | |
482 | /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ | |
483 | /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ | |
484 | /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ | |
485 | movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ | |
486 | movl %eax,%edx /* 2nd arg: syscall number */ | |
487 | movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ | |
488 | call audit_syscall_entry | |
489 | pushl %ebx | |
490 | CFI_ADJUST_CFA_OFFSET 4 | |
491 | movl PT_EAX(%esp),%eax /* reload syscall number */ | |
492 | jmp sysenter_do_call | |
493 | ||
494 | sysexit_audit: | |
88200bc2 | 495 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
496 | jne syscall_exit_work |
497 | TRACE_IRQS_ON | |
498 | ENABLE_INTERRUPTS(CLBR_ANY) | |
499 | movl %eax,%edx /* second arg, syscall return value */ | |
500 | cmpl $0,%eax /* is it < 0? */ | |
501 | setl %al /* 1 if so, 0 if not */ | |
502 | movzbl %al,%eax /* zero-extend that */ | |
503 | inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ | |
504 | call audit_syscall_exit | |
505 | DISABLE_INTERRUPTS(CLBR_ANY) | |
506 | TRACE_IRQS_OFF | |
507 | movl TI_flags(%ebp), %ecx | |
88200bc2 | 508 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
509 | jne syscall_exit_work |
510 | movl PT_EAX(%esp),%eax /* reload syscall return value */ | |
511 | jmp sysenter_exit | |
512 | #endif | |
513 | ||
fe7cacc1 | 514 | CFI_ENDPROC |
f95d47ca | 515 | .pushsection .fixup,"ax" |
464d1a78 | 516 | 2: movl $0,PT_FS(%esp) |
f95d47ca JF |
517 | jmp 1b |
518 | .section __ex_table,"a" | |
519 | .align 4 | |
520 | .long 1b,2b | |
521 | .popsection | |
ccbeed3a | 522 | PTGS_TO_GS_EX |
0aa97fb2 | 523 | ENDPROC(ia32_sysenter_target) |
1da177e4 | 524 | |
a00e817f MH |
525 | /* |
526 | * syscall stub including irq exit should be protected against kprobes | |
527 | */ | |
528 | .pushsection .kprobes.text, "ax" | |
1da177e4 LT |
529 | # system call handler stub |
530 | ENTRY(system_call) | |
fe7cacc1 | 531 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 532 | pushl %eax # save orig_eax |
fe7cacc1 | 533 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 LT |
534 | SAVE_ALL |
535 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 536 | # system call tracing in operation / emulation |
88200bc2 | 537 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
1da177e4 LT |
538 | jnz syscall_trace_entry |
539 | cmpl $(nr_syscalls), %eax | |
540 | jae syscall_badsys | |
541 | syscall_call: | |
542 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 543 | movl %eax,PT_EAX(%esp) # store the return value |
1da177e4 | 544 | syscall_exit: |
c7e872e7 | 545 | LOCKDEP_SYS_EXIT |
139ec7c4 | 546 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
547 | # setting need_resched or sigpending |
548 | # between sampling and the iret | |
55f327fa | 549 | TRACE_IRQS_OFF |
1da177e4 | 550 | movl TI_flags(%ebp), %ecx |
88200bc2 | 551 | testl $_TIF_ALLWORK_MASK, %ecx # current->work |
1da177e4 LT |
552 | jne syscall_exit_work |
553 | ||
554 | restore_all: | |
2e04bc76 AH |
555 | TRACE_IRQS_IRET |
556 | restore_all_notrace: | |
eb5b7b9d JF |
557 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
558 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we | |
5df24082 SS |
559 | # are returning to the kernel. |
560 | # See comments in process.c:copy_thread() for details. | |
eb5b7b9d JF |
561 | movb PT_OLDSS(%esp), %ah |
562 | movb PT_CS(%esp), %al | |
ab68ed98 | 563 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
78be3706 | 564 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
fe7cacc1 | 565 | CFI_REMEMBER_STATE |
1da177e4 LT |
566 | je ldt_ss # returning to user-space with LDT SS |
567 | restore_nocheck: | |
ccbeed3a | 568 | RESTORE_REGS 4 # skip orig_eax/error_code |
fe7cacc1 | 569 | CFI_ADJUST_CFA_OFFSET -4 |
f7f3d791 | 570 | irq_return: |
3701d863 | 571 | INTERRUPT_RETURN |
1da177e4 | 572 | .section .fixup,"ax" |
90e9f536 | 573 | ENTRY(iret_exc) |
a879cbbb LT |
574 | pushl $0 # no error code |
575 | pushl $do_iret_error | |
576 | jmp error_code | |
1da177e4 LT |
577 | .previous |
578 | .section __ex_table,"a" | |
579 | .align 4 | |
3701d863 | 580 | .long irq_return,iret_exc |
1da177e4 LT |
581 | .previous |
582 | ||
fe7cacc1 | 583 | CFI_RESTORE_STATE |
1da177e4 | 584 | ldt_ss: |
eb5b7b9d | 585 | larl PT_OLDSS(%esp), %eax |
1da177e4 LT |
586 | jnz restore_nocheck |
587 | testl $0x00400000, %eax # returning to 32bit stack? | |
588 | jnz restore_nocheck # allright, normal return | |
d3561b7f RR |
589 | |
590 | #ifdef CONFIG_PARAVIRT | |
591 | /* | |
592 | * The kernel can't run on a non-flat stack if paravirt mode | |
593 | * is active. Rather than try to fixup the high bits of | |
594 | * ESP, bypass this code entirely. This may break DOSemu | |
595 | * and/or Wine support in a paravirt VM, although the option | |
596 | * is still available to implement the setting of the high | |
597 | * 16-bits in the INTERRUPT_RETURN paravirt-op. | |
598 | */ | |
93b1eab3 | 599 | cmpl $0, pv_info+PARAVIRT_enabled |
d3561b7f RR |
600 | jne restore_nocheck |
601 | #endif | |
602 | ||
dc4c2a0a AH |
603 | /* |
604 | * Setup and switch to ESPFIX stack | |
605 | * | |
606 | * We're returning to userspace with a 16 bit stack. The CPU will not | |
607 | * restore the high word of ESP for us on executing iret... This is an | |
608 | * "official" bug of all the x86-compatible CPUs, which we can work | |
609 | * around to make dosemu and wine happy. We do this by preloading the | |
610 | * high word of ESP with the high word of the userspace ESP while | |
611 | * compensating for the offset by changing to the ESPFIX segment with | |
612 | * a base address that matches for the difference. | |
613 | */ | |
72c511dd | 614 | #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) |
dc4c2a0a AH |
615 | mov %esp, %edx /* load kernel esp */ |
616 | mov PT_OLDESP(%esp), %eax /* load userspace esp */ | |
617 | mov %dx, %ax /* eax: new kernel esp */ | |
618 | sub %eax, %edx /* offset (low word is 0) */ | |
dc4c2a0a | 619 | shr $16, %edx |
72c511dd BG |
620 | mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */ |
621 | mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */ | |
be44d2aa SS |
622 | pushl $__ESPFIX_SS |
623 | CFI_ADJUST_CFA_OFFSET 4 | |
dc4c2a0a | 624 | push %eax /* new kernel esp */ |
be44d2aa | 625 | CFI_ADJUST_CFA_OFFSET 4 |
2e04bc76 AH |
626 | /* Disable interrupts, but do not irqtrace this section: we |
627 | * will soon execute iret and the tracer was already set to | |
628 | * the irqstate after the iret */ | |
139ec7c4 | 629 | DISABLE_INTERRUPTS(CLBR_EAX) |
dc4c2a0a | 630 | lss (%esp), %esp /* switch to espfix segment */ |
be44d2aa SS |
631 | CFI_ADJUST_CFA_OFFSET -8 |
632 | jmp restore_nocheck | |
fe7cacc1 | 633 | CFI_ENDPROC |
47a55cd7 | 634 | ENDPROC(system_call) |
1da177e4 LT |
635 | |
636 | # perform work that needs to be done immediately before resumption | |
637 | ALIGN | |
fe7cacc1 | 638 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
1da177e4 LT |
639 | work_pending: |
640 | testb $_TIF_NEED_RESCHED, %cl | |
641 | jz work_notifysig | |
642 | work_resched: | |
643 | call schedule | |
c7e872e7 | 644 | LOCKDEP_SYS_EXIT |
139ec7c4 | 645 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
646 | # setting need_resched or sigpending |
647 | # between sampling and the iret | |
55f327fa | 648 | TRACE_IRQS_OFF |
1da177e4 LT |
649 | movl TI_flags(%ebp), %ecx |
650 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
651 | # than syscall tracing? | |
652 | jz restore_all | |
653 | testb $_TIF_NEED_RESCHED, %cl | |
654 | jnz work_resched | |
655 | ||
656 | work_notifysig: # deal with pending signals and | |
657 | # notify-resume requests | |
74b47a78 | 658 | #ifdef CONFIG_VM86 |
ab68ed98 | 659 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
1da177e4 LT |
660 | movl %esp, %eax |
661 | jne work_notifysig_v86 # returning to kernel-space or | |
662 | # vm86-space | |
663 | xorl %edx, %edx | |
664 | call do_notify_resume | |
4031ff38 | 665 | jmp resume_userspace_sig |
1da177e4 LT |
666 | |
667 | ALIGN | |
668 | work_notifysig_v86: | |
669 | pushl %ecx # save ti_flags for do_notify_resume | |
fe7cacc1 | 670 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 LT |
671 | call save_v86_state # %eax contains pt_regs pointer |
672 | popl %ecx | |
fe7cacc1 | 673 | CFI_ADJUST_CFA_OFFSET -4 |
1da177e4 | 674 | movl %eax, %esp |
74b47a78 JK |
675 | #else |
676 | movl %esp, %eax | |
677 | #endif | |
1da177e4 LT |
678 | xorl %edx, %edx |
679 | call do_notify_resume | |
4031ff38 | 680 | jmp resume_userspace_sig |
47a55cd7 | 681 | END(work_pending) |
1da177e4 LT |
682 | |
683 | # perform syscall exit tracing | |
684 | ALIGN | |
685 | syscall_trace_entry: | |
eb5b7b9d | 686 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 687 | movl %esp, %eax |
d4d67150 RM |
688 | call syscall_trace_enter |
689 | /* What it returned is what we'll actually use. */ | |
1da177e4 LT |
690 | cmpl $(nr_syscalls), %eax |
691 | jnae syscall_call | |
692 | jmp syscall_exit | |
47a55cd7 | 693 | END(syscall_trace_entry) |
1da177e4 LT |
694 | |
695 | # perform syscall exit tracing | |
696 | ALIGN | |
697 | syscall_exit_work: | |
88200bc2 | 698 | testl $_TIF_WORK_SYSCALL_EXIT, %ecx |
1da177e4 | 699 | jz work_pending |
55f327fa | 700 | TRACE_IRQS_ON |
d4d67150 | 701 | ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call |
1da177e4 LT |
702 | # schedule() instead |
703 | movl %esp, %eax | |
d4d67150 | 704 | call syscall_trace_leave |
1da177e4 | 705 | jmp resume_userspace |
47a55cd7 | 706 | END(syscall_exit_work) |
fe7cacc1 | 707 | CFI_ENDPROC |
1da177e4 | 708 | |
fe7cacc1 | 709 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 710 | syscall_fault: |
1da177e4 | 711 | GET_THREAD_INFO(%ebp) |
eb5b7b9d | 712 | movl $-EFAULT,PT_EAX(%esp) |
1da177e4 | 713 | jmp resume_userspace |
47a55cd7 | 714 | END(syscall_fault) |
1da177e4 | 715 | |
1da177e4 | 716 | syscall_badsys: |
eb5b7b9d | 717 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 718 | jmp resume_userspace |
47a55cd7 | 719 | END(syscall_badsys) |
fe7cacc1 | 720 | CFI_ENDPROC |
a00e817f MH |
721 | /* |
722 | * End of kprobes section | |
723 | */ | |
724 | .popsection | |
1da177e4 | 725 | |
253f29a4 BG |
726 | /* |
727 | * System calls that need a pt_regs pointer. | |
728 | */ | |
e258e4e0 | 729 | #define PTREGSCALL0(name) \ |
253f29a4 BG |
730 | ALIGN; \ |
731 | ptregs_##name: \ | |
732 | leal 4(%esp),%eax; \ | |
733 | jmp sys_##name; | |
734 | ||
e258e4e0 BG |
735 | #define PTREGSCALL1(name) \ |
736 | ALIGN; \ | |
737 | ptregs_##name: \ | |
738 | leal 4(%esp),%edx; \ | |
ce9119ad | 739 | movl (PT_EBX+4)(%esp),%eax; \ |
e258e4e0 BG |
740 | jmp sys_##name; |
741 | ||
742 | #define PTREGSCALL2(name) \ | |
743 | ALIGN; \ | |
744 | ptregs_##name: \ | |
745 | leal 4(%esp),%ecx; \ | |
ce9119ad PA |
746 | movl (PT_ECX+4)(%esp),%edx; \ |
747 | movl (PT_EBX+4)(%esp),%eax; \ | |
e258e4e0 BG |
748 | jmp sys_##name; |
749 | ||
750 | #define PTREGSCALL3(name) \ | |
751 | ALIGN; \ | |
752 | ptregs_##name: \ | |
a34107b5 | 753 | CFI_STARTPROC; \ |
e258e4e0 | 754 | leal 4(%esp),%eax; \ |
a34107b5 | 755 | pushl_cfi %eax; \ |
e258e4e0 BG |
756 | movl PT_EDX(%eax),%ecx; \ |
757 | movl PT_ECX(%eax),%edx; \ | |
758 | movl PT_EBX(%eax),%eax; \ | |
759 | call sys_##name; \ | |
760 | addl $4,%esp; \ | |
a34107b5 JB |
761 | CFI_ADJUST_CFA_OFFSET -4; \ |
762 | ret; \ | |
763 | CFI_ENDPROC; \ | |
764 | ENDPROC(ptregs_##name) | |
e258e4e0 | 765 | |
27f59559 | 766 | PTREGSCALL1(iopl) |
e258e4e0 | 767 | PTREGSCALL0(fork) |
e258e4e0 | 768 | PTREGSCALL0(vfork) |
11cf88bd | 769 | PTREGSCALL3(execve) |
052acad4 | 770 | PTREGSCALL2(sigaltstack) |
e258e4e0 BG |
771 | PTREGSCALL0(sigreturn) |
772 | PTREGSCALL0(rt_sigreturn) | |
f1382f15 BG |
773 | PTREGSCALL2(vm86) |
774 | PTREGSCALL1(vm86old) | |
253f29a4 | 775 | |
f839bbc5 BG |
776 | /* Clone is an oddball. The 4th arg is in %edi */ |
777 | ALIGN; | |
778 | ptregs_clone: | |
a34107b5 | 779 | CFI_STARTPROC |
f839bbc5 | 780 | leal 4(%esp),%eax |
a34107b5 JB |
781 | pushl_cfi %eax |
782 | pushl_cfi PT_EDI(%eax) | |
f839bbc5 BG |
783 | movl PT_EDX(%eax),%ecx |
784 | movl PT_ECX(%eax),%edx | |
785 | movl PT_EBX(%eax),%eax | |
786 | call sys_clone | |
787 | addl $8,%esp | |
a34107b5 | 788 | CFI_ADJUST_CFA_OFFSET -8 |
f839bbc5 | 789 | ret |
a34107b5 JB |
790 | CFI_ENDPROC |
791 | ENDPROC(ptregs_clone) | |
f839bbc5 | 792 | |
f0d96110 | 793 | .macro FIXUP_ESPFIX_STACK |
dc4c2a0a AH |
794 | /* |
795 | * Switch back for ESPFIX stack to the normal zerobased stack | |
796 | * | |
797 | * We can't call C functions using the ESPFIX stack. This code reads | |
798 | * the high word of the segment base from the GDT and swiches to the | |
799 | * normal stack and adjusts ESP with the matching offset. | |
800 | */ | |
801 | /* fixup the stack */ | |
72c511dd BG |
802 | mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */ |
803 | mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */ | |
dc4c2a0a AH |
804 | shl $16, %eax |
805 | addl %esp, %eax /* the adjusted stack pointer */ | |
f0d96110 TH |
806 | pushl $__KERNEL_DS |
807 | CFI_ADJUST_CFA_OFFSET 4 | |
808 | pushl %eax | |
809 | CFI_ADJUST_CFA_OFFSET 4 | |
dc4c2a0a | 810 | lss (%esp), %esp /* switch to the normal stack segment */ |
f0d96110 TH |
811 | CFI_ADJUST_CFA_OFFSET -8 |
812 | .endm | |
813 | .macro UNWIND_ESPFIX_STACK | |
814 | movl %ss, %eax | |
815 | /* see if on espfix stack */ | |
816 | cmpw $__ESPFIX_SS, %ax | |
817 | jne 27f | |
818 | movl $__KERNEL_DS, %eax | |
819 | movl %eax, %ds | |
820 | movl %eax, %es | |
821 | /* switch to normal stack */ | |
822 | FIXUP_ESPFIX_STACK | |
823 | 27: | |
824 | .endm | |
1da177e4 LT |
825 | |
826 | /* | |
b7c6244f PA |
827 | * Build the entry stubs and pointer table with some assembler magic. |
828 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
829 | * single cache line on all modern x86 implementations. | |
1da177e4 | 830 | */ |
4687518c | 831 | .section .init.rodata,"a" |
1da177e4 LT |
832 | ENTRY(interrupt) |
833 | .text | |
b7c6244f PA |
834 | .p2align 5 |
835 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
1da177e4 | 836 | ENTRY(irq_entries_start) |
fe7cacc1 | 837 | RING0_INT_FRAME |
4687518c | 838 | vector=FIRST_EXTERNAL_VECTOR |
b7c6244f PA |
839 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 |
840 | .balign 32 | |
841 | .rept 7 | |
842 | .if vector < NR_VECTORS | |
8665596e | 843 | .if vector <> FIRST_EXTERNAL_VECTOR |
fe7cacc1 | 844 | CFI_ADJUST_CFA_OFFSET -4 |
b7c6244f PA |
845 | .endif |
846 | 1: pushl $(~vector+0x80) /* Note: always in signed byte range */ | |
fe7cacc1 | 847 | CFI_ADJUST_CFA_OFFSET 4 |
8665596e | 848 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
b7c6244f PA |
849 | jmp 2f |
850 | .endif | |
851 | .previous | |
1da177e4 | 852 | .long 1b |
b7c6244f | 853 | .text |
1da177e4 | 854 | vector=vector+1 |
b7c6244f PA |
855 | .endif |
856 | .endr | |
857 | 2: jmp common_interrupt | |
1da177e4 | 858 | .endr |
47a55cd7 JB |
859 | END(irq_entries_start) |
860 | ||
861 | .previous | |
862 | END(interrupt) | |
863 | .previous | |
1da177e4 | 864 | |
55f327fa IM |
865 | /* |
866 | * the CPU automatically disables interrupts when executing an IRQ vector, | |
867 | * so IRQ-flags tracing has to follow that: | |
868 | */ | |
b7c6244f | 869 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
1da177e4 | 870 | common_interrupt: |
b7c6244f | 871 | addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ |
1da177e4 | 872 | SAVE_ALL |
55f327fa | 873 | TRACE_IRQS_OFF |
1da177e4 LT |
874 | movl %esp,%eax |
875 | call do_IRQ | |
876 | jmp ret_from_intr | |
47a55cd7 | 877 | ENDPROC(common_interrupt) |
fe7cacc1 | 878 | CFI_ENDPROC |
1da177e4 | 879 | |
a00e817f MH |
880 | /* |
881 | * Irq entries should be protected against kprobes | |
882 | */ | |
883 | .pushsection .kprobes.text, "ax" | |
02cf94c3 | 884 | #define BUILD_INTERRUPT3(name, nr, fn) \ |
1da177e4 | 885 | ENTRY(name) \ |
fe7cacc1 | 886 | RING0_INT_FRAME; \ |
19eadf98 | 887 | pushl $~(nr); \ |
fe7cacc1 JB |
888 | CFI_ADJUST_CFA_OFFSET 4; \ |
889 | SAVE_ALL; \ | |
55f327fa | 890 | TRACE_IRQS_OFF \ |
1da177e4 | 891 | movl %esp,%eax; \ |
02cf94c3 | 892 | call fn; \ |
55f327fa | 893 | jmp ret_from_intr; \ |
47a55cd7 JB |
894 | CFI_ENDPROC; \ |
895 | ENDPROC(name) | |
1da177e4 | 896 | |
02cf94c3 TH |
897 | #define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) |
898 | ||
1da177e4 | 899 | /* The include is where all of the SMP etc. interrupts come from */ |
1164dd00 | 900 | #include <asm/entry_arch.h> |
1da177e4 | 901 | |
1da177e4 | 902 | ENTRY(coprocessor_error) |
fe7cacc1 | 903 | RING0_INT_FRAME |
1da177e4 | 904 | pushl $0 |
fe7cacc1 | 905 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 906 | pushl $do_coprocessor_error |
fe7cacc1 | 907 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 908 | jmp error_code |
fe7cacc1 | 909 | CFI_ENDPROC |
47a55cd7 | 910 | END(coprocessor_error) |
1da177e4 LT |
911 | |
912 | ENTRY(simd_coprocessor_error) | |
fe7cacc1 | 913 | RING0_INT_FRAME |
1da177e4 | 914 | pushl $0 |
fe7cacc1 | 915 | CFI_ADJUST_CFA_OFFSET 4 |
40d2e763 BG |
916 | #ifdef CONFIG_X86_INVD_BUG |
917 | /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ | |
918 | 661: pushl $do_general_protection | |
919 | 662: | |
920 | .section .altinstructions,"a" | |
921 | .balign 4 | |
922 | .long 661b | |
923 | .long 663f | |
83a7a2ad | 924 | .word X86_FEATURE_XMM |
40d2e763 BG |
925 | .byte 662b-661b |
926 | .byte 664f-663f | |
927 | .previous | |
928 | .section .altinstr_replacement,"ax" | |
929 | 663: pushl $do_simd_coprocessor_error | |
930 | 664: | |
931 | .previous | |
932 | #else | |
1da177e4 | 933 | pushl $do_simd_coprocessor_error |
40d2e763 | 934 | #endif |
fe7cacc1 | 935 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 936 | jmp error_code |
fe7cacc1 | 937 | CFI_ENDPROC |
47a55cd7 | 938 | END(simd_coprocessor_error) |
1da177e4 LT |
939 | |
940 | ENTRY(device_not_available) | |
fe7cacc1 | 941 | RING0_INT_FRAME |
1da177e4 | 942 | pushl $-1 # mark this as an int |
fe7cacc1 | 943 | CFI_ADJUST_CFA_OFFSET 4 |
7643e9b9 | 944 | pushl $do_device_not_available |
fe7cacc1 | 945 | CFI_ADJUST_CFA_OFFSET 4 |
7643e9b9 | 946 | jmp error_code |
fe7cacc1 | 947 | CFI_ENDPROC |
47a55cd7 | 948 | END(device_not_available) |
1da177e4 | 949 | |
d3561b7f RR |
950 | #ifdef CONFIG_PARAVIRT |
951 | ENTRY(native_iret) | |
3701d863 | 952 | iret |
d3561b7f RR |
953 | .section __ex_table,"a" |
954 | .align 4 | |
3701d863 | 955 | .long native_iret, iret_exc |
d3561b7f | 956 | .previous |
47a55cd7 | 957 | END(native_iret) |
d3561b7f | 958 | |
d75cd22f | 959 | ENTRY(native_irq_enable_sysexit) |
d3561b7f RR |
960 | sti |
961 | sysexit | |
d75cd22f | 962 | END(native_irq_enable_sysexit) |
d3561b7f RR |
963 | #endif |
964 | ||
1da177e4 | 965 | ENTRY(overflow) |
fe7cacc1 | 966 | RING0_INT_FRAME |
1da177e4 | 967 | pushl $0 |
fe7cacc1 | 968 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 969 | pushl $do_overflow |
fe7cacc1 | 970 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 971 | jmp error_code |
fe7cacc1 | 972 | CFI_ENDPROC |
47a55cd7 | 973 | END(overflow) |
1da177e4 LT |
974 | |
975 | ENTRY(bounds) | |
fe7cacc1 | 976 | RING0_INT_FRAME |
1da177e4 | 977 | pushl $0 |
fe7cacc1 | 978 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 979 | pushl $do_bounds |
fe7cacc1 | 980 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 981 | jmp error_code |
fe7cacc1 | 982 | CFI_ENDPROC |
47a55cd7 | 983 | END(bounds) |
1da177e4 LT |
984 | |
985 | ENTRY(invalid_op) | |
fe7cacc1 | 986 | RING0_INT_FRAME |
1da177e4 | 987 | pushl $0 |
fe7cacc1 | 988 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 989 | pushl $do_invalid_op |
fe7cacc1 | 990 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 991 | jmp error_code |
fe7cacc1 | 992 | CFI_ENDPROC |
47a55cd7 | 993 | END(invalid_op) |
1da177e4 LT |
994 | |
995 | ENTRY(coprocessor_segment_overrun) | |
fe7cacc1 | 996 | RING0_INT_FRAME |
1da177e4 | 997 | pushl $0 |
fe7cacc1 | 998 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 999 | pushl $do_coprocessor_segment_overrun |
fe7cacc1 | 1000 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1001 | jmp error_code |
fe7cacc1 | 1002 | CFI_ENDPROC |
47a55cd7 | 1003 | END(coprocessor_segment_overrun) |
1da177e4 LT |
1004 | |
1005 | ENTRY(invalid_TSS) | |
fe7cacc1 | 1006 | RING0_EC_FRAME |
1da177e4 | 1007 | pushl $do_invalid_TSS |
fe7cacc1 | 1008 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1009 | jmp error_code |
fe7cacc1 | 1010 | CFI_ENDPROC |
47a55cd7 | 1011 | END(invalid_TSS) |
1da177e4 LT |
1012 | |
1013 | ENTRY(segment_not_present) | |
fe7cacc1 | 1014 | RING0_EC_FRAME |
1da177e4 | 1015 | pushl $do_segment_not_present |
fe7cacc1 | 1016 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1017 | jmp error_code |
fe7cacc1 | 1018 | CFI_ENDPROC |
47a55cd7 | 1019 | END(segment_not_present) |
1da177e4 LT |
1020 | |
1021 | ENTRY(stack_segment) | |
fe7cacc1 | 1022 | RING0_EC_FRAME |
1da177e4 | 1023 | pushl $do_stack_segment |
fe7cacc1 | 1024 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1025 | jmp error_code |
fe7cacc1 | 1026 | CFI_ENDPROC |
47a55cd7 | 1027 | END(stack_segment) |
1da177e4 | 1028 | |
1da177e4 | 1029 | ENTRY(alignment_check) |
fe7cacc1 | 1030 | RING0_EC_FRAME |
1da177e4 | 1031 | pushl $do_alignment_check |
fe7cacc1 | 1032 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1033 | jmp error_code |
fe7cacc1 | 1034 | CFI_ENDPROC |
47a55cd7 | 1035 | END(alignment_check) |
1da177e4 | 1036 | |
d28c4393 P |
1037 | ENTRY(divide_error) |
1038 | RING0_INT_FRAME | |
1039 | pushl $0 # no error code | |
1040 | CFI_ADJUST_CFA_OFFSET 4 | |
1041 | pushl $do_divide_error | |
fe7cacc1 | 1042 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1043 | jmp error_code |
fe7cacc1 | 1044 | CFI_ENDPROC |
47a55cd7 | 1045 | END(divide_error) |
1da177e4 LT |
1046 | |
1047 | #ifdef CONFIG_X86_MCE | |
1048 | ENTRY(machine_check) | |
fe7cacc1 | 1049 | RING0_INT_FRAME |
1da177e4 | 1050 | pushl $0 |
fe7cacc1 | 1051 | CFI_ADJUST_CFA_OFFSET 4 |
d2f6f7ae | 1052 | pushl machine_check_vector |
fe7cacc1 | 1053 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1054 | jmp error_code |
fe7cacc1 | 1055 | CFI_ENDPROC |
47a55cd7 | 1056 | END(machine_check) |
1da177e4 LT |
1057 | #endif |
1058 | ||
1059 | ENTRY(spurious_interrupt_bug) | |
fe7cacc1 | 1060 | RING0_INT_FRAME |
1da177e4 | 1061 | pushl $0 |
fe7cacc1 | 1062 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1063 | pushl $do_spurious_interrupt_bug |
fe7cacc1 | 1064 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 1065 | jmp error_code |
fe7cacc1 | 1066 | CFI_ENDPROC |
47a55cd7 | 1067 | END(spurious_interrupt_bug) |
a00e817f MH |
1068 | /* |
1069 | * End of kprobes section | |
1070 | */ | |
1071 | .popsection | |
1da177e4 | 1072 | |
02ba1a32 AK |
1073 | ENTRY(kernel_thread_helper) |
1074 | pushl $0 # fake return address for unwinder | |
1075 | CFI_STARTPROC | |
e840227c BG |
1076 | movl %edi,%eax |
1077 | call *%esi | |
02ba1a32 | 1078 | call do_exit |
5f5db591 | 1079 | ud2 # padding for call trace |
02ba1a32 AK |
1080 | CFI_ENDPROC |
1081 | ENDPROC(kernel_thread_helper) | |
1082 | ||
5ead97c8 | 1083 | #ifdef CONFIG_XEN |
e2a81baf JF |
1084 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
1085 | entrypoint expects, so fix it up before using the normal path. */ | |
1086 | ENTRY(xen_sysenter_target) | |
1087 | RING0_INT_FRAME | |
1088 | addl $5*4, %esp /* remove xen-provided frame */ | |
2ddf9b7b | 1089 | CFI_ADJUST_CFA_OFFSET -5*4 |
e2a81baf | 1090 | jmp sysenter_past_esp |
557d7d4e | 1091 | CFI_ENDPROC |
e2a81baf | 1092 | |
5ead97c8 JF |
1093 | ENTRY(xen_hypervisor_callback) |
1094 | CFI_STARTPROC | |
1095 | pushl $0 | |
1096 | CFI_ADJUST_CFA_OFFSET 4 | |
1097 | SAVE_ALL | |
1098 | TRACE_IRQS_OFF | |
9ec2b804 JF |
1099 | |
1100 | /* Check to see if we got the event in the critical | |
1101 | region in xen_iret_direct, after we've reenabled | |
1102 | events and checked for pending events. This simulates | |
1103 | iret instruction's behaviour where it delivers a | |
1104 | pending interrupt when enabling interrupts. */ | |
1105 | movl PT_EIP(%esp),%eax | |
1106 | cmpl $xen_iret_start_crit,%eax | |
1107 | jb 1f | |
1108 | cmpl $xen_iret_end_crit,%eax | |
1109 | jae 1f | |
1110 | ||
0f2c8769 | 1111 | jmp xen_iret_crit_fixup |
e2a81baf | 1112 | |
e2a81baf | 1113 | ENTRY(xen_do_upcall) |
b77797fb | 1114 | 1: mov %esp, %eax |
5ead97c8 JF |
1115 | call xen_evtchn_do_upcall |
1116 | jmp ret_from_intr | |
1117 | CFI_ENDPROC | |
1118 | ENDPROC(xen_hypervisor_callback) | |
1119 | ||
1120 | # Hypervisor uses this for application faults while it executes. | |
1121 | # We get here for two reasons: | |
1122 | # 1. Fault while reloading DS, ES, FS or GS | |
1123 | # 2. Fault while executing IRET | |
1124 | # Category 1 we fix up by reattempting the load, and zeroing the segment | |
1125 | # register if the load fails. | |
1126 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the | |
1127 | # normal Linux return path in this case because if we use the IRET hypercall | |
1128 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1129 | # We distinguish between categories by maintaining a status value in EAX. | |
1130 | ENTRY(xen_failsafe_callback) | |
1131 | CFI_STARTPROC | |
1132 | pushl %eax | |
1133 | CFI_ADJUST_CFA_OFFSET 4 | |
1134 | movl $1,%eax | |
1135 | 1: mov 4(%esp),%ds | |
1136 | 2: mov 8(%esp),%es | |
1137 | 3: mov 12(%esp),%fs | |
1138 | 4: mov 16(%esp),%gs | |
1139 | testl %eax,%eax | |
1140 | popl %eax | |
1141 | CFI_ADJUST_CFA_OFFSET -4 | |
1142 | lea 16(%esp),%esp | |
1143 | CFI_ADJUST_CFA_OFFSET -16 | |
1144 | jz 5f | |
1145 | addl $16,%esp | |
1146 | jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) | |
1147 | 5: pushl $0 # EAX == 0 => Category 1 (Bad segment) | |
1148 | CFI_ADJUST_CFA_OFFSET 4 | |
1149 | SAVE_ALL | |
1150 | jmp ret_from_exception | |
1151 | CFI_ENDPROC | |
1152 | ||
1153 | .section .fixup,"ax" | |
1154 | 6: xorl %eax,%eax | |
1155 | movl %eax,4(%esp) | |
1156 | jmp 1b | |
1157 | 7: xorl %eax,%eax | |
1158 | movl %eax,8(%esp) | |
1159 | jmp 2b | |
1160 | 8: xorl %eax,%eax | |
1161 | movl %eax,12(%esp) | |
1162 | jmp 3b | |
1163 | 9: xorl %eax,%eax | |
1164 | movl %eax,16(%esp) | |
1165 | jmp 4b | |
1166 | .previous | |
1167 | .section __ex_table,"a" | |
1168 | .align 4 | |
1169 | .long 1b,6b | |
1170 | .long 2b,7b | |
1171 | .long 3b,8b | |
1172 | .long 4b,9b | |
1173 | .previous | |
1174 | ENDPROC(xen_failsafe_callback) | |
1175 | ||
38e20b07 SY |
1176 | BUILD_INTERRUPT3(xen_hvm_callback_vector, XEN_HVM_EVTCHN_CALLBACK, |
1177 | xen_evtchn_do_upcall) | |
1178 | ||
5ead97c8 JF |
1179 | #endif /* CONFIG_XEN */ |
1180 | ||
606576ce | 1181 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
1182 | #ifdef CONFIG_DYNAMIC_FTRACE |
1183 | ||
1184 | ENTRY(mcount) | |
d61f82d0 SR |
1185 | ret |
1186 | END(mcount) | |
1187 | ||
1188 | ENTRY(ftrace_caller) | |
60a7ecf4 SR |
1189 | cmpl $0, function_trace_stop |
1190 | jne ftrace_stub | |
1191 | ||
d61f82d0 SR |
1192 | pushl %eax |
1193 | pushl %ecx | |
1194 | pushl %edx | |
1195 | movl 0xc(%esp), %eax | |
1196 | movl 0x4(%ebp), %edx | |
395a59d0 | 1197 | subl $MCOUNT_INSN_SIZE, %eax |
d61f82d0 SR |
1198 | |
1199 | .globl ftrace_call | |
1200 | ftrace_call: | |
1201 | call ftrace_stub | |
1202 | ||
1203 | popl %edx | |
1204 | popl %ecx | |
1205 | popl %eax | |
5a45cfe1 SR |
1206 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1207 | .globl ftrace_graph_call | |
1208 | ftrace_graph_call: | |
1209 | jmp ftrace_stub | |
1210 | #endif | |
d61f82d0 SR |
1211 | |
1212 | .globl ftrace_stub | |
1213 | ftrace_stub: | |
1214 | ret | |
1215 | END(ftrace_caller) | |
1216 | ||
1217 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
1218 | ||
16444a8a | 1219 | ENTRY(mcount) |
60a7ecf4 SR |
1220 | cmpl $0, function_trace_stop |
1221 | jne ftrace_stub | |
1222 | ||
16444a8a ACM |
1223 | cmpl $ftrace_stub, ftrace_trace_function |
1224 | jnz trace | |
fb52607a | 1225 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
c2324b69 | 1226 | cmpl $ftrace_stub, ftrace_graph_return |
fb52607a | 1227 | jnz ftrace_graph_caller |
e49dc19c SR |
1228 | |
1229 | cmpl $ftrace_graph_entry_stub, ftrace_graph_entry | |
1230 | jnz ftrace_graph_caller | |
caf4b323 | 1231 | #endif |
16444a8a ACM |
1232 | .globl ftrace_stub |
1233 | ftrace_stub: | |
1234 | ret | |
1235 | ||
1236 | /* taken from glibc */ | |
1237 | trace: | |
1238 | pushl %eax | |
1239 | pushl %ecx | |
1240 | pushl %edx | |
1241 | movl 0xc(%esp), %eax | |
1242 | movl 0x4(%ebp), %edx | |
395a59d0 | 1243 | subl $MCOUNT_INSN_SIZE, %eax |
16444a8a | 1244 | |
d61f82d0 | 1245 | call *ftrace_trace_function |
16444a8a ACM |
1246 | |
1247 | popl %edx | |
1248 | popl %ecx | |
1249 | popl %eax | |
16444a8a ACM |
1250 | jmp ftrace_stub |
1251 | END(mcount) | |
d61f82d0 | 1252 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 1253 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 1254 | |
fb52607a FW |
1255 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1256 | ENTRY(ftrace_graph_caller) | |
e7d3737e FW |
1257 | cmpl $0, function_trace_stop |
1258 | jne ftrace_stub | |
1259 | ||
caf4b323 FW |
1260 | pushl %eax |
1261 | pushl %ecx | |
1262 | pushl %edx | |
1dc1c6ad | 1263 | movl 0xc(%esp), %edx |
caf4b323 | 1264 | lea 0x4(%ebp), %eax |
71e308a2 | 1265 | movl (%ebp), %ecx |
bb4304c7 | 1266 | subl $MCOUNT_INSN_SIZE, %edx |
caf4b323 | 1267 | call prepare_ftrace_return |
caf4b323 FW |
1268 | popl %edx |
1269 | popl %ecx | |
1270 | popl %eax | |
e7d3737e | 1271 | ret |
fb52607a | 1272 | END(ftrace_graph_caller) |
caf4b323 FW |
1273 | |
1274 | .globl return_to_handler | |
1275 | return_to_handler: | |
caf4b323 | 1276 | pushl %eax |
caf4b323 | 1277 | pushl %edx |
71e308a2 | 1278 | movl %ebp, %eax |
caf4b323 | 1279 | call ftrace_return_to_handler |
194ec341 | 1280 | movl %eax, %ecx |
caf4b323 | 1281 | popl %edx |
caf4b323 | 1282 | popl %eax |
194ec341 | 1283 | jmp *%ecx |
e7d3737e | 1284 | #endif |
16444a8a | 1285 | |
bb152f53 | 1286 | .section .rodata,"a" |
541054d9 | 1287 | #include "syscall_table_32.S" |
1da177e4 LT |
1288 | |
1289 | syscall_table_size=(.-sys_call_table) | |
d211af05 AH |
1290 | |
1291 | /* | |
1292 | * Some functions should be protected against kprobes | |
1293 | */ | |
1294 | .pushsection .kprobes.text, "ax" | |
1295 | ||
1296 | ENTRY(page_fault) | |
1297 | RING0_EC_FRAME | |
1298 | pushl $do_page_fault | |
1299 | CFI_ADJUST_CFA_OFFSET 4 | |
1300 | ALIGN | |
1301 | error_code: | |
ccbeed3a TH |
1302 | /* the function address is in %gs's slot on the stack */ |
1303 | pushl %fs | |
1304 | CFI_ADJUST_CFA_OFFSET 4 | |
1305 | /*CFI_REL_OFFSET fs, 0*/ | |
d211af05 AH |
1306 | pushl %es |
1307 | CFI_ADJUST_CFA_OFFSET 4 | |
1308 | /*CFI_REL_OFFSET es, 0*/ | |
1309 | pushl %ds | |
1310 | CFI_ADJUST_CFA_OFFSET 4 | |
1311 | /*CFI_REL_OFFSET ds, 0*/ | |
1312 | pushl %eax | |
1313 | CFI_ADJUST_CFA_OFFSET 4 | |
1314 | CFI_REL_OFFSET eax, 0 | |
1315 | pushl %ebp | |
1316 | CFI_ADJUST_CFA_OFFSET 4 | |
1317 | CFI_REL_OFFSET ebp, 0 | |
1318 | pushl %edi | |
1319 | CFI_ADJUST_CFA_OFFSET 4 | |
1320 | CFI_REL_OFFSET edi, 0 | |
1321 | pushl %esi | |
1322 | CFI_ADJUST_CFA_OFFSET 4 | |
1323 | CFI_REL_OFFSET esi, 0 | |
1324 | pushl %edx | |
1325 | CFI_ADJUST_CFA_OFFSET 4 | |
1326 | CFI_REL_OFFSET edx, 0 | |
1327 | pushl %ecx | |
1328 | CFI_ADJUST_CFA_OFFSET 4 | |
1329 | CFI_REL_OFFSET ecx, 0 | |
1330 | pushl %ebx | |
1331 | CFI_ADJUST_CFA_OFFSET 4 | |
1332 | CFI_REL_OFFSET ebx, 0 | |
1333 | cld | |
d211af05 AH |
1334 | movl $(__KERNEL_PERCPU), %ecx |
1335 | movl %ecx, %fs | |
1336 | UNWIND_ESPFIX_STACK | |
ccbeed3a TH |
1337 | GS_TO_REG %ecx |
1338 | movl PT_GS(%esp), %edi # get the function address | |
d211af05 AH |
1339 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
1340 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart | |
ccbeed3a TH |
1341 | REG_TO_PTGS %ecx |
1342 | SET_KERNEL_GS %ecx | |
d211af05 AH |
1343 | movl $(__USER_DS), %ecx |
1344 | movl %ecx, %ds | |
1345 | movl %ecx, %es | |
1346 | TRACE_IRQS_OFF | |
1347 | movl %esp,%eax # pt_regs pointer | |
1348 | call *%edi | |
1349 | jmp ret_from_exception | |
1350 | CFI_ENDPROC | |
1351 | END(page_fault) | |
1352 | ||
1353 | /* | |
1354 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
1355 | * that sets up the real kernel stack. Check here, since we can't | |
1356 | * allow the wrong stack to be used. | |
1357 | * | |
1358 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have | |
1359 | * already pushed 3 words if it hits on the sysenter instruction: | |
1360 | * eflags, cs and eip. | |
1361 | * | |
1362 | * We just load the right stack, and push the three (known) values | |
1363 | * by hand onto the new stack - while updating the return eip past | |
1364 | * the instruction that would have done it for sysenter. | |
1365 | */ | |
f0d96110 TH |
1366 | .macro FIX_STACK offset ok label |
1367 | cmpw $__KERNEL_CS, 4(%esp) | |
1368 | jne \ok | |
1369 | \label: | |
1370 | movl TSS_sysenter_sp0 + \offset(%esp), %esp | |
1371 | CFI_DEF_CFA esp, 0 | |
1372 | CFI_UNDEFINED eip | |
1373 | pushfl | |
1374 | CFI_ADJUST_CFA_OFFSET 4 | |
1375 | pushl $__KERNEL_CS | |
1376 | CFI_ADJUST_CFA_OFFSET 4 | |
1377 | pushl $sysenter_past_esp | |
1378 | CFI_ADJUST_CFA_OFFSET 4 | |
d211af05 | 1379 | CFI_REL_OFFSET eip, 0 |
f0d96110 | 1380 | .endm |
d211af05 AH |
1381 | |
1382 | ENTRY(debug) | |
1383 | RING0_INT_FRAME | |
1384 | cmpl $ia32_sysenter_target,(%esp) | |
1385 | jne debug_stack_correct | |
f0d96110 | 1386 | FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn |
d211af05 AH |
1387 | debug_stack_correct: |
1388 | pushl $-1 # mark this as an int | |
1389 | CFI_ADJUST_CFA_OFFSET 4 | |
1390 | SAVE_ALL | |
1391 | TRACE_IRQS_OFF | |
1392 | xorl %edx,%edx # error code 0 | |
1393 | movl %esp,%eax # pt_regs pointer | |
1394 | call do_debug | |
1395 | jmp ret_from_exception | |
1396 | CFI_ENDPROC | |
1397 | END(debug) | |
1398 | ||
1399 | /* | |
1400 | * NMI is doubly nasty. It can happen _while_ we're handling | |
1401 | * a debug fault, and the debug fault hasn't yet been able to | |
1402 | * clear up the stack. So we first check whether we got an | |
1403 | * NMI on the sysenter entry path, but after that we need to | |
1404 | * check whether we got an NMI on the debug path where the debug | |
1405 | * fault happened on the sysenter path. | |
1406 | */ | |
1407 | ENTRY(nmi) | |
1408 | RING0_INT_FRAME | |
1409 | pushl %eax | |
1410 | CFI_ADJUST_CFA_OFFSET 4 | |
1411 | movl %ss, %eax | |
1412 | cmpw $__ESPFIX_SS, %ax | |
1413 | popl %eax | |
1414 | CFI_ADJUST_CFA_OFFSET -4 | |
1415 | je nmi_espfix_stack | |
1416 | cmpl $ia32_sysenter_target,(%esp) | |
1417 | je nmi_stack_fixup | |
1418 | pushl %eax | |
1419 | CFI_ADJUST_CFA_OFFSET 4 | |
1420 | movl %esp,%eax | |
1421 | /* Do not access memory above the end of our stack page, | |
1422 | * it might not exist. | |
1423 | */ | |
1424 | andl $(THREAD_SIZE-1),%eax | |
1425 | cmpl $(THREAD_SIZE-20),%eax | |
1426 | popl %eax | |
1427 | CFI_ADJUST_CFA_OFFSET -4 | |
1428 | jae nmi_stack_correct | |
1429 | cmpl $ia32_sysenter_target,12(%esp) | |
1430 | je nmi_debug_stack_check | |
1431 | nmi_stack_correct: | |
1432 | /* We have a RING0_INT_FRAME here */ | |
1433 | pushl %eax | |
1434 | CFI_ADJUST_CFA_OFFSET 4 | |
1435 | SAVE_ALL | |
d211af05 AH |
1436 | xorl %edx,%edx # zero error code |
1437 | movl %esp,%eax # pt_regs pointer | |
1438 | call do_nmi | |
2e04bc76 | 1439 | jmp restore_all_notrace |
d211af05 AH |
1440 | CFI_ENDPROC |
1441 | ||
1442 | nmi_stack_fixup: | |
1443 | RING0_INT_FRAME | |
f0d96110 | 1444 | FIX_STACK 12, nmi_stack_correct, 1 |
d211af05 AH |
1445 | jmp nmi_stack_correct |
1446 | ||
1447 | nmi_debug_stack_check: | |
1448 | /* We have a RING0_INT_FRAME here */ | |
1449 | cmpw $__KERNEL_CS,16(%esp) | |
1450 | jne nmi_stack_correct | |
1451 | cmpl $debug,(%esp) | |
1452 | jb nmi_stack_correct | |
1453 | cmpl $debug_esp_fix_insn,(%esp) | |
1454 | ja nmi_stack_correct | |
f0d96110 | 1455 | FIX_STACK 24, nmi_stack_correct, 1 |
d211af05 AH |
1456 | jmp nmi_stack_correct |
1457 | ||
1458 | nmi_espfix_stack: | |
1459 | /* We have a RING0_INT_FRAME here. | |
1460 | * | |
1461 | * create the pointer to lss back | |
1462 | */ | |
1463 | pushl %ss | |
1464 | CFI_ADJUST_CFA_OFFSET 4 | |
1465 | pushl %esp | |
1466 | CFI_ADJUST_CFA_OFFSET 4 | |
bda3a897 | 1467 | addl $4, (%esp) |
d211af05 AH |
1468 | /* copy the iret frame of 12 bytes */ |
1469 | .rept 3 | |
1470 | pushl 16(%esp) | |
1471 | CFI_ADJUST_CFA_OFFSET 4 | |
1472 | .endr | |
1473 | pushl %eax | |
1474 | CFI_ADJUST_CFA_OFFSET 4 | |
1475 | SAVE_ALL | |
d211af05 AH |
1476 | FIXUP_ESPFIX_STACK # %eax == %esp |
1477 | xorl %edx,%edx # zero error code | |
1478 | call do_nmi | |
1479 | RESTORE_REGS | |
1480 | lss 12+4(%esp), %esp # back to espfix stack | |
1481 | CFI_ADJUST_CFA_OFFSET -24 | |
1482 | jmp irq_return | |
1483 | CFI_ENDPROC | |
1484 | END(nmi) | |
1485 | ||
1486 | ENTRY(int3) | |
1487 | RING0_INT_FRAME | |
1488 | pushl $-1 # mark this as an int | |
1489 | CFI_ADJUST_CFA_OFFSET 4 | |
1490 | SAVE_ALL | |
1491 | TRACE_IRQS_OFF | |
1492 | xorl %edx,%edx # zero error code | |
1493 | movl %esp,%eax # pt_regs pointer | |
1494 | call do_int3 | |
1495 | jmp ret_from_exception | |
1496 | CFI_ENDPROC | |
1497 | END(int3) | |
1498 | ||
1499 | ENTRY(general_protection) | |
1500 | RING0_EC_FRAME | |
1501 | pushl $do_general_protection | |
1502 | CFI_ADJUST_CFA_OFFSET 4 | |
1503 | jmp error_code | |
1504 | CFI_ENDPROC | |
1505 | END(general_protection) | |
1506 | ||
1507 | /* | |
1508 | * End of kprobes section | |
1509 | */ | |
1510 | .popsection |