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1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/entry.S | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* | |
8 | * entry.S contains the system-call and fault low-level handling routines. | |
9 | * This also contains the timer-interrupt handler, as well as all interrupts | |
10 | * and faults that can result in a task-switch. | |
11 | * | |
12 | * NOTE: This code handles signal-recognition, which happens every time | |
13 | * after a timer-interrupt and after each system call. | |
14 | * | |
15 | * I changed all the .align's to 4 (16 byte alignment), as that's faster | |
16 | * on a 486. | |
17 | * | |
18 | * Stack layout in 'ret_from_system_call': | |
19 | * ptrace needs to have all regs on the stack. | |
20 | * if the order here is changed, it needs to be | |
21 | * updated in fork.c:copy_process, signal.c:do_signal, | |
22 | * ptrace.c and ptrace.h | |
23 | * | |
24 | * 0(%esp) - %ebx | |
25 | * 4(%esp) - %ecx | |
26 | * 8(%esp) - %edx | |
27 | * C(%esp) - %esi | |
28 | * 10(%esp) - %edi | |
29 | * 14(%esp) - %ebp | |
30 | * 18(%esp) - %eax | |
31 | * 1C(%esp) - %ds | |
32 | * 20(%esp) - %es | |
33 | * 24(%esp) - orig_eax | |
34 | * 28(%esp) - %eip | |
35 | * 2C(%esp) - %cs | |
36 | * 30(%esp) - %eflags | |
37 | * 34(%esp) - %oldesp | |
38 | * 38(%esp) - %oldss | |
39 | * | |
40 | * "current" is in register %ebx during any slow entries. | |
41 | */ | |
42 | ||
43 | #include <linux/config.h> | |
44 | #include <linux/linkage.h> | |
45 | #include <asm/thread_info.h> | |
46 | #include <asm/errno.h> | |
47 | #include <asm/segment.h> | |
48 | #include <asm/smp.h> | |
49 | #include <asm/page.h> | |
50 | #include <asm/desc.h> | |
51 | #include "irq_vectors.h" | |
52 | ||
53 | #define nr_syscalls ((syscall_table_size)/4) | |
54 | ||
55 | EBX = 0x00 | |
56 | ECX = 0x04 | |
57 | EDX = 0x08 | |
58 | ESI = 0x0C | |
59 | EDI = 0x10 | |
60 | EBP = 0x14 | |
61 | EAX = 0x18 | |
62 | DS = 0x1C | |
63 | ES = 0x20 | |
64 | ORIG_EAX = 0x24 | |
65 | EIP = 0x28 | |
66 | CS = 0x2C | |
67 | EFLAGS = 0x30 | |
68 | OLDESP = 0x34 | |
69 | OLDSS = 0x38 | |
70 | ||
71 | CF_MASK = 0x00000001 | |
72 | TF_MASK = 0x00000100 | |
73 | IF_MASK = 0x00000200 | |
74 | DF_MASK = 0x00000400 | |
75 | NT_MASK = 0x00004000 | |
76 | VM_MASK = 0x00020000 | |
77 | ||
78 | #ifdef CONFIG_PREEMPT | |
79 | #define preempt_stop cli | |
80 | #else | |
81 | #define preempt_stop | |
82 | #define resume_kernel restore_nocheck | |
83 | #endif | |
84 | ||
85 | #define SAVE_ALL \ | |
86 | cld; \ | |
87 | pushl %es; \ | |
88 | pushl %ds; \ | |
89 | pushl %eax; \ | |
90 | pushl %ebp; \ | |
91 | pushl %edi; \ | |
92 | pushl %esi; \ | |
93 | pushl %edx; \ | |
94 | pushl %ecx; \ | |
95 | pushl %ebx; \ | |
96 | movl $(__USER_DS), %edx; \ | |
97 | movl %edx, %ds; \ | |
98 | movl %edx, %es; | |
99 | ||
100 | #define RESTORE_INT_REGS \ | |
101 | popl %ebx; \ | |
102 | popl %ecx; \ | |
103 | popl %edx; \ | |
104 | popl %esi; \ | |
105 | popl %edi; \ | |
106 | popl %ebp; \ | |
107 | popl %eax | |
108 | ||
109 | #define RESTORE_REGS \ | |
110 | RESTORE_INT_REGS; \ | |
111 | 1: popl %ds; \ | |
112 | 2: popl %es; \ | |
113 | .section .fixup,"ax"; \ | |
114 | 3: movl $0,(%esp); \ | |
115 | jmp 1b; \ | |
116 | 4: movl $0,(%esp); \ | |
117 | jmp 2b; \ | |
118 | .previous; \ | |
119 | .section __ex_table,"a";\ | |
120 | .align 4; \ | |
121 | .long 1b,3b; \ | |
122 | .long 2b,4b; \ | |
123 | .previous | |
124 | ||
125 | ||
126 | ENTRY(ret_from_fork) | |
127 | pushl %eax | |
128 | call schedule_tail | |
129 | GET_THREAD_INFO(%ebp) | |
130 | popl %eax | |
131 | jmp syscall_exit | |
132 | ||
133 | /* | |
134 | * Return to user mode is not as complex as all this looks, | |
135 | * but we want the default path for a system call return to | |
136 | * go as quickly as possible which is why some of this is | |
137 | * less clear than it otherwise should be. | |
138 | */ | |
139 | ||
140 | # userspace resumption stub bypassing syscall exit tracing | |
141 | ALIGN | |
142 | ret_from_exception: | |
143 | preempt_stop | |
144 | ret_from_intr: | |
145 | GET_THREAD_INFO(%ebp) | |
146 | movl EFLAGS(%esp), %eax # mix EFLAGS and CS | |
147 | movb CS(%esp), %al | |
148 | testl $(VM_MASK | 3), %eax | |
149 | jz resume_kernel | |
150 | ENTRY(resume_userspace) | |
151 | cli # make sure we don't miss an interrupt | |
152 | # setting need_resched or sigpending | |
153 | # between sampling and the iret | |
154 | movl TI_flags(%ebp), %ecx | |
155 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
156 | # int/exception return? | |
157 | jne work_pending | |
158 | jmp restore_all | |
159 | ||
160 | #ifdef CONFIG_PREEMPT | |
161 | ENTRY(resume_kernel) | |
162 | cli | |
163 | cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? | |
164 | jnz restore_nocheck | |
165 | need_resched: | |
166 | movl TI_flags(%ebp), %ecx # need_resched set ? | |
167 | testb $_TIF_NEED_RESCHED, %cl | |
168 | jz restore_all | |
169 | testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception path) ? | |
170 | jz restore_all | |
171 | call preempt_schedule_irq | |
172 | jmp need_resched | |
173 | #endif | |
174 | ||
175 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
176 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
177 | ||
178 | # sysenter call handler stub | |
179 | ENTRY(sysenter_entry) | |
180 | movl TSS_sysenter_esp0(%esp),%esp | |
181 | sysenter_past_esp: | |
182 | sti | |
183 | pushl $(__USER_DS) | |
184 | pushl %ebp | |
185 | pushfl | |
186 | pushl $(__USER_CS) | |
187 | pushl $SYSENTER_RETURN | |
188 | ||
189 | /* | |
190 | * Load the potential sixth argument from user stack. | |
191 | * Careful about security. | |
192 | */ | |
193 | cmpl $__PAGE_OFFSET-3,%ebp | |
194 | jae syscall_fault | |
195 | 1: movl (%ebp),%ebp | |
196 | .section __ex_table,"a" | |
197 | .align 4 | |
198 | .long 1b,syscall_fault | |
199 | .previous | |
200 | ||
201 | pushl %eax | |
202 | SAVE_ALL | |
203 | GET_THREAD_INFO(%ebp) | |
204 | ||
205 | /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ | |
ed75e8d5 | 206 | testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
1da177e4 LT |
207 | jnz syscall_trace_entry |
208 | cmpl $(nr_syscalls), %eax | |
209 | jae syscall_badsys | |
210 | call *sys_call_table(,%eax,4) | |
211 | movl %eax,EAX(%esp) | |
212 | cli | |
213 | movl TI_flags(%ebp), %ecx | |
214 | testw $_TIF_ALLWORK_MASK, %cx | |
215 | jne syscall_exit_work | |
216 | /* if something modifies registers it must also disable sysexit */ | |
217 | movl EIP(%esp), %edx | |
218 | movl OLDESP(%esp), %ecx | |
219 | xorl %ebp,%ebp | |
220 | sti | |
221 | sysexit | |
222 | ||
223 | ||
224 | # system call handler stub | |
225 | ENTRY(system_call) | |
226 | pushl %eax # save orig_eax | |
227 | SAVE_ALL | |
228 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 229 | # system call tracing in operation / emulation |
1da177e4 | 230 | /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */ |
ed75e8d5 | 231 | testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
1da177e4 LT |
232 | jnz syscall_trace_entry |
233 | cmpl $(nr_syscalls), %eax | |
234 | jae syscall_badsys | |
235 | syscall_call: | |
236 | call *sys_call_table(,%eax,4) | |
237 | movl %eax,EAX(%esp) # store the return value | |
238 | syscall_exit: | |
239 | cli # make sure we don't miss an interrupt | |
240 | # setting need_resched or sigpending | |
241 | # between sampling and the iret | |
242 | movl TI_flags(%ebp), %ecx | |
243 | testw $_TIF_ALLWORK_MASK, %cx # current->work | |
244 | jne syscall_exit_work | |
245 | ||
246 | restore_all: | |
247 | movl EFLAGS(%esp), %eax # mix EFLAGS, SS and CS | |
5df24082 SS |
248 | # Warning: OLDSS(%esp) contains the wrong/random values if we |
249 | # are returning to the kernel. | |
250 | # See comments in process.c:copy_thread() for details. | |
1da177e4 LT |
251 | movb OLDSS(%esp), %ah |
252 | movb CS(%esp), %al | |
253 | andl $(VM_MASK | (4 << 8) | 3), %eax | |
254 | cmpl $((4 << 8) | 3), %eax | |
255 | je ldt_ss # returning to user-space with LDT SS | |
256 | restore_nocheck: | |
257 | RESTORE_REGS | |
258 | addl $4, %esp | |
259 | 1: iret | |
260 | .section .fixup,"ax" | |
261 | iret_exc: | |
262 | sti | |
a879cbbb LT |
263 | pushl $0 # no error code |
264 | pushl $do_iret_error | |
265 | jmp error_code | |
1da177e4 LT |
266 | .previous |
267 | .section __ex_table,"a" | |
268 | .align 4 | |
269 | .long 1b,iret_exc | |
270 | .previous | |
271 | ||
272 | ldt_ss: | |
273 | larl OLDSS(%esp), %eax | |
274 | jnz restore_nocheck | |
275 | testl $0x00400000, %eax # returning to 32bit stack? | |
276 | jnz restore_nocheck # allright, normal return | |
277 | /* If returning to userspace with 16bit stack, | |
278 | * try to fix the higher word of ESP, as the CPU | |
279 | * won't restore it. | |
280 | * This is an "official" bug of all the x86-compatible | |
281 | * CPUs, which we can try to work around to make | |
282 | * dosemu and wine happy. */ | |
283 | subl $8, %esp # reserve space for switch16 pointer | |
284 | cli | |
285 | movl %esp, %eax | |
286 | /* Set up the 16bit stack frame with switch32 pointer on top, | |
287 | * and a switch16 pointer on top of the current frame. */ | |
288 | call setup_x86_bogus_stack | |
289 | RESTORE_REGS | |
290 | lss 20+4(%esp), %esp # switch to 16bit stack | |
291 | 1: iret | |
292 | .section __ex_table,"a" | |
293 | .align 4 | |
294 | .long 1b,iret_exc | |
295 | .previous | |
296 | ||
297 | # perform work that needs to be done immediately before resumption | |
298 | ALIGN | |
299 | work_pending: | |
300 | testb $_TIF_NEED_RESCHED, %cl | |
301 | jz work_notifysig | |
302 | work_resched: | |
303 | call schedule | |
304 | cli # make sure we don't miss an interrupt | |
305 | # setting need_resched or sigpending | |
306 | # between sampling and the iret | |
307 | movl TI_flags(%ebp), %ecx | |
308 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
309 | # than syscall tracing? | |
310 | jz restore_all | |
311 | testb $_TIF_NEED_RESCHED, %cl | |
312 | jnz work_resched | |
313 | ||
314 | work_notifysig: # deal with pending signals and | |
315 | # notify-resume requests | |
316 | testl $VM_MASK, EFLAGS(%esp) | |
317 | movl %esp, %eax | |
318 | jne work_notifysig_v86 # returning to kernel-space or | |
319 | # vm86-space | |
320 | xorl %edx, %edx | |
321 | call do_notify_resume | |
322 | jmp restore_all | |
323 | ||
324 | ALIGN | |
325 | work_notifysig_v86: | |
326 | pushl %ecx # save ti_flags for do_notify_resume | |
327 | call save_v86_state # %eax contains pt_regs pointer | |
328 | popl %ecx | |
329 | movl %eax, %esp | |
330 | xorl %edx, %edx | |
331 | call do_notify_resume | |
332 | jmp restore_all | |
333 | ||
334 | # perform syscall exit tracing | |
335 | ALIGN | |
336 | syscall_trace_entry: | |
337 | movl $-ENOSYS,EAX(%esp) | |
338 | movl %esp, %eax | |
339 | xorl %edx,%edx | |
340 | call do_syscall_trace | |
ed75e8d5 | 341 | cmpl $0, %eax |
640aa46e | 342 | jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU, |
ed75e8d5 | 343 | # so must skip actual syscall |
1da177e4 LT |
344 | movl ORIG_EAX(%esp), %eax |
345 | cmpl $(nr_syscalls), %eax | |
346 | jnae syscall_call | |
347 | jmp syscall_exit | |
348 | ||
349 | # perform syscall exit tracing | |
350 | ALIGN | |
351 | syscall_exit_work: | |
352 | testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl | |
353 | jz work_pending | |
354 | sti # could let do_syscall_trace() call | |
355 | # schedule() instead | |
356 | movl %esp, %eax | |
357 | movl $1, %edx | |
358 | call do_syscall_trace | |
359 | jmp resume_userspace | |
360 | ||
361 | ALIGN | |
362 | syscall_fault: | |
363 | pushl %eax # save orig_eax | |
364 | SAVE_ALL | |
365 | GET_THREAD_INFO(%ebp) | |
366 | movl $-EFAULT,EAX(%esp) | |
367 | jmp resume_userspace | |
368 | ||
369 | ALIGN | |
370 | syscall_badsys: | |
371 | movl $-ENOSYS,EAX(%esp) | |
372 | jmp resume_userspace | |
373 | ||
374 | #define FIXUP_ESPFIX_STACK \ | |
375 | movl %esp, %eax; \ | |
376 | /* switch to 32bit stack using the pointer on top of 16bit stack */ \ | |
377 | lss %ss:CPU_16BIT_STACK_SIZE-8, %esp; \ | |
378 | /* copy data from 16bit stack to 32bit stack */ \ | |
379 | call fixup_x86_bogus_stack; \ | |
380 | /* put ESP to the proper location */ \ | |
381 | movl %eax, %esp; | |
382 | #define UNWIND_ESPFIX_STACK \ | |
383 | pushl %eax; \ | |
384 | movl %ss, %eax; \ | |
385 | /* see if on 16bit stack */ \ | |
386 | cmpw $__ESPFIX_SS, %ax; \ | |
387 | jne 28f; \ | |
388 | movl $__KERNEL_DS, %edx; \ | |
389 | movl %edx, %ds; \ | |
390 | movl %edx, %es; \ | |
391 | /* switch to 32bit stack */ \ | |
392 | FIXUP_ESPFIX_STACK \ | |
393 | 28: popl %eax; | |
394 | ||
395 | /* | |
396 | * Build the entry stubs and pointer table with | |
397 | * some assembler magic. | |
398 | */ | |
399 | .data | |
400 | ENTRY(interrupt) | |
401 | .text | |
402 | ||
403 | vector=0 | |
404 | ENTRY(irq_entries_start) | |
405 | .rept NR_IRQS | |
406 | ALIGN | |
407 | 1: pushl $vector-256 | |
408 | jmp common_interrupt | |
409 | .data | |
410 | .long 1b | |
411 | .text | |
412 | vector=vector+1 | |
413 | .endr | |
414 | ||
415 | ALIGN | |
416 | common_interrupt: | |
417 | SAVE_ALL | |
418 | movl %esp,%eax | |
419 | call do_IRQ | |
420 | jmp ret_from_intr | |
421 | ||
422 | #define BUILD_INTERRUPT(name, nr) \ | |
423 | ENTRY(name) \ | |
424 | pushl $nr-256; \ | |
425 | SAVE_ALL \ | |
426 | movl %esp,%eax; \ | |
427 | call smp_/**/name; \ | |
428 | jmp ret_from_intr; | |
429 | ||
430 | /* The include is where all of the SMP etc. interrupts come from */ | |
431 | #include "entry_arch.h" | |
432 | ||
433 | ENTRY(divide_error) | |
434 | pushl $0 # no error code | |
435 | pushl $do_divide_error | |
436 | ALIGN | |
437 | error_code: | |
438 | pushl %ds | |
439 | pushl %eax | |
440 | xorl %eax, %eax | |
441 | pushl %ebp | |
442 | pushl %edi | |
443 | pushl %esi | |
444 | pushl %edx | |
445 | decl %eax # eax = -1 | |
446 | pushl %ecx | |
447 | pushl %ebx | |
448 | cld | |
449 | pushl %es | |
450 | UNWIND_ESPFIX_STACK | |
451 | popl %ecx | |
452 | movl ES(%esp), %edi # get the function address | |
453 | movl ORIG_EAX(%esp), %edx # get the error code | |
454 | movl %eax, ORIG_EAX(%esp) | |
455 | movl %ecx, ES(%esp) | |
456 | movl $(__USER_DS), %ecx | |
457 | movl %ecx, %ds | |
458 | movl %ecx, %es | |
459 | movl %esp,%eax # pt_regs pointer | |
460 | call *%edi | |
461 | jmp ret_from_exception | |
462 | ||
463 | ENTRY(coprocessor_error) | |
464 | pushl $0 | |
465 | pushl $do_coprocessor_error | |
466 | jmp error_code | |
467 | ||
468 | ENTRY(simd_coprocessor_error) | |
469 | pushl $0 | |
470 | pushl $do_simd_coprocessor_error | |
471 | jmp error_code | |
472 | ||
473 | ENTRY(device_not_available) | |
474 | pushl $-1 # mark this as an int | |
475 | SAVE_ALL | |
476 | movl %cr0, %eax | |
477 | testl $0x4, %eax # EM (math emulation bit) | |
478 | jne device_not_available_emulate | |
479 | preempt_stop | |
480 | call math_state_restore | |
481 | jmp ret_from_exception | |
482 | device_not_available_emulate: | |
483 | pushl $0 # temporary storage for ORIG_EIP | |
484 | call math_emulate | |
485 | addl $4, %esp | |
486 | jmp ret_from_exception | |
487 | ||
488 | /* | |
489 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
490 | * that sets up the real kernel stack. Check here, since we can't | |
491 | * allow the wrong stack to be used. | |
492 | * | |
493 | * "TSS_sysenter_esp0+12" is because the NMI/debug handler will have | |
494 | * already pushed 3 words if it hits on the sysenter instruction: | |
495 | * eflags, cs and eip. | |
496 | * | |
497 | * We just load the right stack, and push the three (known) values | |
498 | * by hand onto the new stack - while updating the return eip past | |
499 | * the instruction that would have done it for sysenter. | |
500 | */ | |
501 | #define FIX_STACK(offset, ok, label) \ | |
502 | cmpw $__KERNEL_CS,4(%esp); \ | |
503 | jne ok; \ | |
504 | label: \ | |
505 | movl TSS_sysenter_esp0+offset(%esp),%esp; \ | |
506 | pushfl; \ | |
507 | pushl $__KERNEL_CS; \ | |
508 | pushl $sysenter_past_esp | |
509 | ||
510 | ENTRY(debug) | |
511 | cmpl $sysenter_entry,(%esp) | |
512 | jne debug_stack_correct | |
513 | FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn) | |
514 | debug_stack_correct: | |
515 | pushl $-1 # mark this as an int | |
516 | SAVE_ALL | |
517 | xorl %edx,%edx # error code 0 | |
518 | movl %esp,%eax # pt_regs pointer | |
519 | call do_debug | |
1da177e4 LT |
520 | jmp ret_from_exception |
521 | ||
522 | /* | |
523 | * NMI is doubly nasty. It can happen _while_ we're handling | |
524 | * a debug fault, and the debug fault hasn't yet been able to | |
525 | * clear up the stack. So we first check whether we got an | |
526 | * NMI on the sysenter entry path, but after that we need to | |
527 | * check whether we got an NMI on the debug path where the debug | |
528 | * fault happened on the sysenter path. | |
529 | */ | |
530 | ENTRY(nmi) | |
531 | pushl %eax | |
532 | movl %ss, %eax | |
533 | cmpw $__ESPFIX_SS, %ax | |
534 | popl %eax | |
535 | je nmi_16bit_stack | |
536 | cmpl $sysenter_entry,(%esp) | |
537 | je nmi_stack_fixup | |
538 | pushl %eax | |
539 | movl %esp,%eax | |
540 | /* Do not access memory above the end of our stack page, | |
541 | * it might not exist. | |
542 | */ | |
543 | andl $(THREAD_SIZE-1),%eax | |
544 | cmpl $(THREAD_SIZE-20),%eax | |
545 | popl %eax | |
546 | jae nmi_stack_correct | |
547 | cmpl $sysenter_entry,12(%esp) | |
548 | je nmi_debug_stack_check | |
549 | nmi_stack_correct: | |
550 | pushl %eax | |
551 | SAVE_ALL | |
552 | xorl %edx,%edx # zero error code | |
553 | movl %esp,%eax # pt_regs pointer | |
554 | call do_nmi | |
555 | jmp restore_all | |
556 | ||
557 | nmi_stack_fixup: | |
558 | FIX_STACK(12,nmi_stack_correct, 1) | |
559 | jmp nmi_stack_correct | |
560 | nmi_debug_stack_check: | |
561 | cmpw $__KERNEL_CS,16(%esp) | |
562 | jne nmi_stack_correct | |
563 | cmpl $debug - 1,(%esp) | |
564 | jle nmi_stack_correct | |
565 | cmpl $debug_esp_fix_insn,(%esp) | |
566 | jle nmi_debug_stack_fixup | |
567 | nmi_debug_stack_fixup: | |
568 | FIX_STACK(24,nmi_stack_correct, 1) | |
569 | jmp nmi_stack_correct | |
570 | ||
571 | nmi_16bit_stack: | |
572 | /* create the pointer to lss back */ | |
573 | pushl %ss | |
574 | pushl %esp | |
575 | movzwl %sp, %esp | |
576 | addw $4, (%esp) | |
577 | /* copy the iret frame of 12 bytes */ | |
578 | .rept 3 | |
579 | pushl 16(%esp) | |
580 | .endr | |
581 | pushl %eax | |
582 | SAVE_ALL | |
583 | FIXUP_ESPFIX_STACK # %eax == %esp | |
584 | xorl %edx,%edx # zero error code | |
585 | call do_nmi | |
586 | RESTORE_REGS | |
587 | lss 12+4(%esp), %esp # back to 16bit stack | |
588 | 1: iret | |
589 | .section __ex_table,"a" | |
590 | .align 4 | |
591 | .long 1b,iret_exc | |
592 | .previous | |
593 | ||
594 | ENTRY(int3) | |
595 | pushl $-1 # mark this as an int | |
596 | SAVE_ALL | |
597 | xorl %edx,%edx # zero error code | |
598 | movl %esp,%eax # pt_regs pointer | |
599 | call do_int3 | |
1da177e4 LT |
600 | jmp ret_from_exception |
601 | ||
602 | ENTRY(overflow) | |
603 | pushl $0 | |
604 | pushl $do_overflow | |
605 | jmp error_code | |
606 | ||
607 | ENTRY(bounds) | |
608 | pushl $0 | |
609 | pushl $do_bounds | |
610 | jmp error_code | |
611 | ||
612 | ENTRY(invalid_op) | |
613 | pushl $0 | |
614 | pushl $do_invalid_op | |
615 | jmp error_code | |
616 | ||
617 | ENTRY(coprocessor_segment_overrun) | |
618 | pushl $0 | |
619 | pushl $do_coprocessor_segment_overrun | |
620 | jmp error_code | |
621 | ||
622 | ENTRY(invalid_TSS) | |
623 | pushl $do_invalid_TSS | |
624 | jmp error_code | |
625 | ||
626 | ENTRY(segment_not_present) | |
627 | pushl $do_segment_not_present | |
628 | jmp error_code | |
629 | ||
630 | ENTRY(stack_segment) | |
631 | pushl $do_stack_segment | |
632 | jmp error_code | |
633 | ||
634 | ENTRY(general_protection) | |
635 | pushl $do_general_protection | |
636 | jmp error_code | |
637 | ||
638 | ENTRY(alignment_check) | |
639 | pushl $do_alignment_check | |
640 | jmp error_code | |
641 | ||
642 | ENTRY(page_fault) | |
643 | pushl $do_page_fault | |
644 | jmp error_code | |
645 | ||
646 | #ifdef CONFIG_X86_MCE | |
647 | ENTRY(machine_check) | |
648 | pushl $0 | |
649 | pushl machine_check_vector | |
650 | jmp error_code | |
651 | #endif | |
652 | ||
653 | ENTRY(spurious_interrupt_bug) | |
654 | pushl $0 | |
655 | pushl $do_spurious_interrupt_bug | |
656 | jmp error_code | |
657 | ||
5e7b83ff | 658 | #include "syscall_table.S" |
1da177e4 LT |
659 | |
660 | syscall_table_size=(.-sys_call_table) |