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Commit | Line | Data |
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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> |
1da177e4 | 51 | #include <asm/desc.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> |
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) |
1da177e4 LT |
87 | #define resume_kernel restore_nocheck |
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 LT |
336 | |
337 | /* | |
338 | * Return to user mode is not as complex as all this looks, | |
339 | * but we want the default path for a system call return to | |
340 | * go as quickly as possible which is why some of this is | |
341 | * less clear than it otherwise should be. | |
342 | */ | |
343 | ||
344 | # userspace resumption stub bypassing syscall exit tracing | |
345 | ALIGN | |
fe7cacc1 | 346 | RING0_PTREGS_FRAME |
1da177e4 | 347 | ret_from_exception: |
139ec7c4 | 348 | preempt_stop(CLBR_ANY) |
1da177e4 LT |
349 | ret_from_intr: |
350 | GET_THREAD_INFO(%ebp) | |
4031ff38 | 351 | check_userspace: |
eb5b7b9d JF |
352 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS |
353 | movb PT_CS(%esp), %al | |
ab68ed98 | 354 | andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax |
78be3706 RR |
355 | cmpl $USER_RPL, %eax |
356 | jb resume_kernel # not returning to v8086 or userspace | |
f95d47ca | 357 | |
1da177e4 | 358 | ENTRY(resume_userspace) |
c7e872e7 | 359 | LOCKDEP_SYS_EXIT |
139ec7c4 | 360 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
361 | # setting need_resched or sigpending |
362 | # between sampling and the iret | |
e32e58a9 | 363 | TRACE_IRQS_OFF |
1da177e4 LT |
364 | movl TI_flags(%ebp), %ecx |
365 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done on | |
366 | # int/exception return? | |
367 | jne work_pending | |
368 | jmp restore_all | |
47a55cd7 | 369 | END(ret_from_exception) |
1da177e4 LT |
370 | |
371 | #ifdef CONFIG_PREEMPT | |
372 | ENTRY(resume_kernel) | |
139ec7c4 | 373 | DISABLE_INTERRUPTS(CLBR_ANY) |
1da177e4 LT |
374 | cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ? |
375 | jnz restore_nocheck | |
376 | need_resched: | |
377 | movl TI_flags(%ebp), %ecx # need_resched set ? | |
378 | testb $_TIF_NEED_RESCHED, %cl | |
379 | jz restore_all | |
ab68ed98 | 380 | testl $X86_EFLAGS_IF,PT_EFLAGS(%esp) # interrupts off (exception path) ? |
1da177e4 LT |
381 | jz restore_all |
382 | call preempt_schedule_irq | |
383 | jmp need_resched | |
47a55cd7 | 384 | END(resume_kernel) |
1da177e4 | 385 | #endif |
fe7cacc1 | 386 | CFI_ENDPROC |
1da177e4 LT |
387 | |
388 | /* SYSENTER_RETURN points to after the "sysenter" instruction in | |
389 | the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */ | |
390 | ||
391 | # sysenter call handler stub | |
0aa97fb2 | 392 | ENTRY(ia32_sysenter_target) |
fe7cacc1 | 393 | CFI_STARTPROC simple |
adf14236 | 394 | CFI_SIGNAL_FRAME |
fe7cacc1 JB |
395 | CFI_DEF_CFA esp, 0 |
396 | CFI_REGISTER esp, ebp | |
faca6227 | 397 | movl TSS_sysenter_sp0(%esp),%esp |
1da177e4 | 398 | sysenter_past_esp: |
55f327fa | 399 | /* |
d93c870b JF |
400 | * Interrupts are disabled here, but we can't trace it until |
401 | * enough kernel state to call TRACE_IRQS_OFF can be called - but | |
402 | * we immediately enable interrupts at that point anyway. | |
55f327fa | 403 | */ |
1da177e4 | 404 | pushl $(__USER_DS) |
fe7cacc1 JB |
405 | CFI_ADJUST_CFA_OFFSET 4 |
406 | /*CFI_REL_OFFSET ss, 0*/ | |
1da177e4 | 407 | pushl %ebp |
fe7cacc1 JB |
408 | CFI_ADJUST_CFA_OFFSET 4 |
409 | CFI_REL_OFFSET esp, 0 | |
1da177e4 | 410 | pushfl |
d93c870b | 411 | orl $X86_EFLAGS_IF, (%esp) |
fe7cacc1 | 412 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 413 | pushl $(__USER_CS) |
fe7cacc1 JB |
414 | CFI_ADJUST_CFA_OFFSET 4 |
415 | /*CFI_REL_OFFSET cs, 0*/ | |
e6e5494c IM |
416 | /* |
417 | * Push current_thread_info()->sysenter_return to the stack. | |
418 | * A tiny bit of offset fixup is necessary - 4*4 means the 4 words | |
419 | * pushed above; +8 corresponds to copy_thread's esp0 setting. | |
420 | */ | |
421 | pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp) | |
fe7cacc1 JB |
422 | CFI_ADJUST_CFA_OFFSET 4 |
423 | CFI_REL_OFFSET eip, 0 | |
1da177e4 | 424 | |
d93c870b JF |
425 | pushl %eax |
426 | CFI_ADJUST_CFA_OFFSET 4 | |
427 | SAVE_ALL | |
428 | ENABLE_INTERRUPTS(CLBR_NONE) | |
429 | ||
1da177e4 LT |
430 | /* |
431 | * Load the potential sixth argument from user stack. | |
432 | * Careful about security. | |
433 | */ | |
434 | cmpl $__PAGE_OFFSET-3,%ebp | |
435 | jae syscall_fault | |
436 | 1: movl (%ebp),%ebp | |
d93c870b | 437 | movl %ebp,PT_EBP(%esp) |
1da177e4 LT |
438 | .section __ex_table,"a" |
439 | .align 4 | |
440 | .long 1b,syscall_fault | |
441 | .previous | |
442 | ||
1da177e4 LT |
443 | GET_THREAD_INFO(%ebp) |
444 | ||
88200bc2 | 445 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
af0575bb RM |
446 | jnz sysenter_audit |
447 | sysenter_do_call: | |
1da177e4 LT |
448 | cmpl $(nr_syscalls), %eax |
449 | jae syscall_badsys | |
450 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 451 | movl %eax,PT_EAX(%esp) |
c7e872e7 | 452 | LOCKDEP_SYS_EXIT |
42c24fa2 | 453 | DISABLE_INTERRUPTS(CLBR_ANY) |
55f327fa | 454 | TRACE_IRQS_OFF |
1da177e4 | 455 | movl TI_flags(%ebp), %ecx |
88200bc2 | 456 | testl $_TIF_ALLWORK_MASK, %ecx |
af0575bb RM |
457 | jne sysexit_audit |
458 | sysenter_exit: | |
1da177e4 | 459 | /* if something modifies registers it must also disable sysexit */ |
eb5b7b9d JF |
460 | movl PT_EIP(%esp), %edx |
461 | movl PT_OLDESP(%esp), %ecx | |
1da177e4 | 462 | xorl %ebp,%ebp |
55f327fa | 463 | TRACE_IRQS_ON |
464d1a78 | 464 | 1: mov PT_FS(%esp), %fs |
ccbeed3a | 465 | PTGS_TO_GS |
d75cd22f | 466 | ENABLE_INTERRUPTS_SYSEXIT |
af0575bb RM |
467 | |
468 | #ifdef CONFIG_AUDITSYSCALL | |
469 | sysenter_audit: | |
88200bc2 | 470 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%ebp) |
af0575bb RM |
471 | jnz syscall_trace_entry |
472 | addl $4,%esp | |
473 | CFI_ADJUST_CFA_OFFSET -4 | |
474 | /* %esi already in 8(%esp) 6th arg: 4th syscall arg */ | |
475 | /* %edx already in 4(%esp) 5th arg: 3rd syscall arg */ | |
476 | /* %ecx already in 0(%esp) 4th arg: 2nd syscall arg */ | |
477 | movl %ebx,%ecx /* 3rd arg: 1st syscall arg */ | |
478 | movl %eax,%edx /* 2nd arg: syscall number */ | |
479 | movl $AUDIT_ARCH_I386,%eax /* 1st arg: audit arch */ | |
480 | call audit_syscall_entry | |
481 | pushl %ebx | |
482 | CFI_ADJUST_CFA_OFFSET 4 | |
483 | movl PT_EAX(%esp),%eax /* reload syscall number */ | |
484 | jmp sysenter_do_call | |
485 | ||
486 | sysexit_audit: | |
88200bc2 | 487 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
488 | jne syscall_exit_work |
489 | TRACE_IRQS_ON | |
490 | ENABLE_INTERRUPTS(CLBR_ANY) | |
491 | movl %eax,%edx /* second arg, syscall return value */ | |
492 | cmpl $0,%eax /* is it < 0? */ | |
493 | setl %al /* 1 if so, 0 if not */ | |
494 | movzbl %al,%eax /* zero-extend that */ | |
495 | inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ | |
496 | call audit_syscall_exit | |
497 | DISABLE_INTERRUPTS(CLBR_ANY) | |
498 | TRACE_IRQS_OFF | |
499 | movl TI_flags(%ebp), %ecx | |
88200bc2 | 500 | testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx |
af0575bb RM |
501 | jne syscall_exit_work |
502 | movl PT_EAX(%esp),%eax /* reload syscall return value */ | |
503 | jmp sysenter_exit | |
504 | #endif | |
505 | ||
fe7cacc1 | 506 | CFI_ENDPROC |
f95d47ca | 507 | .pushsection .fixup,"ax" |
464d1a78 | 508 | 2: movl $0,PT_FS(%esp) |
f95d47ca JF |
509 | jmp 1b |
510 | .section __ex_table,"a" | |
511 | .align 4 | |
512 | .long 1b,2b | |
513 | .popsection | |
ccbeed3a | 514 | PTGS_TO_GS_EX |
0aa97fb2 | 515 | ENDPROC(ia32_sysenter_target) |
1da177e4 LT |
516 | |
517 | # system call handler stub | |
518 | ENTRY(system_call) | |
fe7cacc1 | 519 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 520 | pushl %eax # save orig_eax |
fe7cacc1 | 521 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 LT |
522 | SAVE_ALL |
523 | GET_THREAD_INFO(%ebp) | |
ed75e8d5 | 524 | # system call tracing in operation / emulation |
88200bc2 | 525 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp) |
1da177e4 LT |
526 | jnz syscall_trace_entry |
527 | cmpl $(nr_syscalls), %eax | |
528 | jae syscall_badsys | |
529 | syscall_call: | |
530 | call *sys_call_table(,%eax,4) | |
eb5b7b9d | 531 | movl %eax,PT_EAX(%esp) # store the return value |
1da177e4 | 532 | syscall_exit: |
c7e872e7 | 533 | LOCKDEP_SYS_EXIT |
139ec7c4 | 534 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
535 | # setting need_resched or sigpending |
536 | # between sampling and the iret | |
55f327fa | 537 | TRACE_IRQS_OFF |
1da177e4 | 538 | movl TI_flags(%ebp), %ecx |
88200bc2 | 539 | testl $_TIF_ALLWORK_MASK, %ecx # current->work |
1da177e4 LT |
540 | jne syscall_exit_work |
541 | ||
542 | restore_all: | |
eb5b7b9d JF |
543 | movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS |
544 | # Warning: PT_OLDSS(%esp) contains the wrong/random values if we | |
5df24082 SS |
545 | # are returning to the kernel. |
546 | # See comments in process.c:copy_thread() for details. | |
eb5b7b9d JF |
547 | movb PT_OLDSS(%esp), %ah |
548 | movb PT_CS(%esp), %al | |
ab68ed98 | 549 | andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax |
78be3706 | 550 | cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax |
fe7cacc1 | 551 | CFI_REMEMBER_STATE |
1da177e4 LT |
552 | je ldt_ss # returning to user-space with LDT SS |
553 | restore_nocheck: | |
55f327fa IM |
554 | TRACE_IRQS_IRET |
555 | restore_nocheck_notrace: | |
ccbeed3a | 556 | RESTORE_REGS 4 # skip orig_eax/error_code |
fe7cacc1 | 557 | CFI_ADJUST_CFA_OFFSET -4 |
f7f3d791 | 558 | irq_return: |
3701d863 | 559 | INTERRUPT_RETURN |
1da177e4 | 560 | .section .fixup,"ax" |
90e9f536 | 561 | ENTRY(iret_exc) |
a879cbbb LT |
562 | pushl $0 # no error code |
563 | pushl $do_iret_error | |
564 | jmp error_code | |
1da177e4 LT |
565 | .previous |
566 | .section __ex_table,"a" | |
567 | .align 4 | |
3701d863 | 568 | .long irq_return,iret_exc |
1da177e4 LT |
569 | .previous |
570 | ||
fe7cacc1 | 571 | CFI_RESTORE_STATE |
1da177e4 | 572 | ldt_ss: |
eb5b7b9d | 573 | larl PT_OLDSS(%esp), %eax |
1da177e4 LT |
574 | jnz restore_nocheck |
575 | testl $0x00400000, %eax # returning to 32bit stack? | |
576 | jnz restore_nocheck # allright, normal return | |
d3561b7f RR |
577 | |
578 | #ifdef CONFIG_PARAVIRT | |
579 | /* | |
580 | * The kernel can't run on a non-flat stack if paravirt mode | |
581 | * is active. Rather than try to fixup the high bits of | |
582 | * ESP, bypass this code entirely. This may break DOSemu | |
583 | * and/or Wine support in a paravirt VM, although the option | |
584 | * is still available to implement the setting of the high | |
585 | * 16-bits in the INTERRUPT_RETURN paravirt-op. | |
586 | */ | |
93b1eab3 | 587 | cmpl $0, pv_info+PARAVIRT_enabled |
d3561b7f RR |
588 | jne restore_nocheck |
589 | #endif | |
590 | ||
1da177e4 LT |
591 | /* If returning to userspace with 16bit stack, |
592 | * try to fix the higher word of ESP, as the CPU | |
593 | * won't restore it. | |
594 | * This is an "official" bug of all the x86-compatible | |
595 | * CPUs, which we can try to work around to make | |
596 | * dosemu and wine happy. */ | |
eb5b7b9d | 597 | movl PT_OLDESP(%esp), %eax |
be44d2aa SS |
598 | movl %esp, %edx |
599 | call patch_espfix_desc | |
600 | pushl $__ESPFIX_SS | |
601 | CFI_ADJUST_CFA_OFFSET 4 | |
602 | pushl %eax | |
603 | CFI_ADJUST_CFA_OFFSET 4 | |
139ec7c4 | 604 | DISABLE_INTERRUPTS(CLBR_EAX) |
55f327fa | 605 | TRACE_IRQS_OFF |
be44d2aa SS |
606 | lss (%esp), %esp |
607 | CFI_ADJUST_CFA_OFFSET -8 | |
608 | jmp restore_nocheck | |
fe7cacc1 | 609 | CFI_ENDPROC |
47a55cd7 | 610 | ENDPROC(system_call) |
1da177e4 LT |
611 | |
612 | # perform work that needs to be done immediately before resumption | |
613 | ALIGN | |
fe7cacc1 | 614 | RING0_PTREGS_FRAME # can't unwind into user space anyway |
1da177e4 LT |
615 | work_pending: |
616 | testb $_TIF_NEED_RESCHED, %cl | |
617 | jz work_notifysig | |
618 | work_resched: | |
619 | call schedule | |
c7e872e7 | 620 | LOCKDEP_SYS_EXIT |
139ec7c4 | 621 | DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt |
1da177e4 LT |
622 | # setting need_resched or sigpending |
623 | # between sampling and the iret | |
55f327fa | 624 | TRACE_IRQS_OFF |
1da177e4 LT |
625 | movl TI_flags(%ebp), %ecx |
626 | andl $_TIF_WORK_MASK, %ecx # is there any work to be done other | |
627 | # than syscall tracing? | |
628 | jz restore_all | |
629 | testb $_TIF_NEED_RESCHED, %cl | |
630 | jnz work_resched | |
631 | ||
632 | work_notifysig: # deal with pending signals and | |
633 | # notify-resume requests | |
74b47a78 | 634 | #ifdef CONFIG_VM86 |
ab68ed98 | 635 | testl $X86_EFLAGS_VM, PT_EFLAGS(%esp) |
1da177e4 LT |
636 | movl %esp, %eax |
637 | jne work_notifysig_v86 # returning to kernel-space or | |
638 | # vm86-space | |
639 | xorl %edx, %edx | |
640 | call do_notify_resume | |
4031ff38 | 641 | jmp resume_userspace_sig |
1da177e4 LT |
642 | |
643 | ALIGN | |
644 | work_notifysig_v86: | |
645 | pushl %ecx # save ti_flags for do_notify_resume | |
fe7cacc1 | 646 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 LT |
647 | call save_v86_state # %eax contains pt_regs pointer |
648 | popl %ecx | |
fe7cacc1 | 649 | CFI_ADJUST_CFA_OFFSET -4 |
1da177e4 | 650 | movl %eax, %esp |
74b47a78 JK |
651 | #else |
652 | movl %esp, %eax | |
653 | #endif | |
1da177e4 LT |
654 | xorl %edx, %edx |
655 | call do_notify_resume | |
4031ff38 | 656 | jmp resume_userspace_sig |
47a55cd7 | 657 | END(work_pending) |
1da177e4 LT |
658 | |
659 | # perform syscall exit tracing | |
660 | ALIGN | |
661 | syscall_trace_entry: | |
eb5b7b9d | 662 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 663 | movl %esp, %eax |
d4d67150 RM |
664 | call syscall_trace_enter |
665 | /* What it returned is what we'll actually use. */ | |
1da177e4 LT |
666 | cmpl $(nr_syscalls), %eax |
667 | jnae syscall_call | |
668 | jmp syscall_exit | |
47a55cd7 | 669 | END(syscall_trace_entry) |
1da177e4 LT |
670 | |
671 | # perform syscall exit tracing | |
672 | ALIGN | |
673 | syscall_exit_work: | |
88200bc2 | 674 | testl $_TIF_WORK_SYSCALL_EXIT, %ecx |
1da177e4 | 675 | jz work_pending |
55f327fa | 676 | TRACE_IRQS_ON |
d4d67150 | 677 | ENABLE_INTERRUPTS(CLBR_ANY) # could let syscall_trace_leave() call |
1da177e4 LT |
678 | # schedule() instead |
679 | movl %esp, %eax | |
d4d67150 | 680 | call syscall_trace_leave |
1da177e4 | 681 | jmp resume_userspace |
47a55cd7 | 682 | END(syscall_exit_work) |
fe7cacc1 | 683 | CFI_ENDPROC |
1da177e4 | 684 | |
fe7cacc1 | 685 | RING0_INT_FRAME # can't unwind into user space anyway |
1da177e4 | 686 | syscall_fault: |
1da177e4 | 687 | GET_THREAD_INFO(%ebp) |
eb5b7b9d | 688 | movl $-EFAULT,PT_EAX(%esp) |
1da177e4 | 689 | jmp resume_userspace |
47a55cd7 | 690 | END(syscall_fault) |
1da177e4 | 691 | |
1da177e4 | 692 | syscall_badsys: |
eb5b7b9d | 693 | movl $-ENOSYS,PT_EAX(%esp) |
1da177e4 | 694 | jmp resume_userspace |
47a55cd7 | 695 | END(syscall_badsys) |
fe7cacc1 | 696 | CFI_ENDPROC |
1da177e4 | 697 | |
253f29a4 BG |
698 | /* |
699 | * System calls that need a pt_regs pointer. | |
700 | */ | |
701 | #define PTREGSCALL(name) \ | |
702 | ALIGN; \ | |
703 | ptregs_##name: \ | |
704 | leal 4(%esp),%eax; \ | |
705 | jmp sys_##name; | |
706 | ||
707 | PTREGSCALL(iopl) | |
708 | PTREGSCALL(fork) | |
709 | PTREGSCALL(clone) | |
710 | PTREGSCALL(vfork) | |
711 | PTREGSCALL(execve) | |
712 | PTREGSCALL(sigaltstack) | |
713 | PTREGSCALL(sigreturn) | |
714 | PTREGSCALL(rt_sigreturn) | |
715 | PTREGSCALL(vm86) | |
716 | PTREGSCALL(vm86old) | |
717 | ||
f0d96110 TH |
718 | .macro FIXUP_ESPFIX_STACK |
719 | /* since we are on a wrong stack, we cant make it a C code :( */ | |
720 | PER_CPU(gdt_page, %ebx) | |
721 | GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah) | |
722 | addl %esp, %eax | |
723 | pushl $__KERNEL_DS | |
724 | CFI_ADJUST_CFA_OFFSET 4 | |
725 | pushl %eax | |
726 | CFI_ADJUST_CFA_OFFSET 4 | |
727 | lss (%esp), %esp | |
728 | CFI_ADJUST_CFA_OFFSET -8 | |
729 | .endm | |
730 | .macro UNWIND_ESPFIX_STACK | |
731 | movl %ss, %eax | |
732 | /* see if on espfix stack */ | |
733 | cmpw $__ESPFIX_SS, %ax | |
734 | jne 27f | |
735 | movl $__KERNEL_DS, %eax | |
736 | movl %eax, %ds | |
737 | movl %eax, %es | |
738 | /* switch to normal stack */ | |
739 | FIXUP_ESPFIX_STACK | |
740 | 27: | |
741 | .endm | |
1da177e4 LT |
742 | |
743 | /* | |
b7c6244f PA |
744 | * Build the entry stubs and pointer table with some assembler magic. |
745 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
746 | * single cache line on all modern x86 implementations. | |
1da177e4 | 747 | */ |
4687518c | 748 | .section .init.rodata,"a" |
1da177e4 LT |
749 | ENTRY(interrupt) |
750 | .text | |
b7c6244f PA |
751 | .p2align 5 |
752 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
1da177e4 | 753 | ENTRY(irq_entries_start) |
fe7cacc1 | 754 | RING0_INT_FRAME |
4687518c | 755 | vector=FIRST_EXTERNAL_VECTOR |
b7c6244f PA |
756 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 |
757 | .balign 32 | |
758 | .rept 7 | |
759 | .if vector < NR_VECTORS | |
8665596e | 760 | .if vector <> FIRST_EXTERNAL_VECTOR |
fe7cacc1 | 761 | CFI_ADJUST_CFA_OFFSET -4 |
b7c6244f PA |
762 | .endif |
763 | 1: pushl $(~vector+0x80) /* Note: always in signed byte range */ | |
fe7cacc1 | 764 | CFI_ADJUST_CFA_OFFSET 4 |
8665596e | 765 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
b7c6244f PA |
766 | jmp 2f |
767 | .endif | |
768 | .previous | |
1da177e4 | 769 | .long 1b |
b7c6244f | 770 | .text |
1da177e4 | 771 | vector=vector+1 |
b7c6244f PA |
772 | .endif |
773 | .endr | |
774 | 2: jmp common_interrupt | |
1da177e4 | 775 | .endr |
47a55cd7 JB |
776 | END(irq_entries_start) |
777 | ||
778 | .previous | |
779 | END(interrupt) | |
780 | .previous | |
1da177e4 | 781 | |
55f327fa IM |
782 | /* |
783 | * the CPU automatically disables interrupts when executing an IRQ vector, | |
784 | * so IRQ-flags tracing has to follow that: | |
785 | */ | |
b7c6244f | 786 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
1da177e4 | 787 | common_interrupt: |
b7c6244f | 788 | addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */ |
1da177e4 | 789 | SAVE_ALL |
55f327fa | 790 | TRACE_IRQS_OFF |
1da177e4 LT |
791 | movl %esp,%eax |
792 | call do_IRQ | |
793 | jmp ret_from_intr | |
47a55cd7 | 794 | ENDPROC(common_interrupt) |
fe7cacc1 | 795 | CFI_ENDPROC |
1da177e4 | 796 | |
02cf94c3 | 797 | #define BUILD_INTERRUPT3(name, nr, fn) \ |
1da177e4 | 798 | ENTRY(name) \ |
fe7cacc1 | 799 | RING0_INT_FRAME; \ |
19eadf98 | 800 | pushl $~(nr); \ |
fe7cacc1 JB |
801 | CFI_ADJUST_CFA_OFFSET 4; \ |
802 | SAVE_ALL; \ | |
55f327fa | 803 | TRACE_IRQS_OFF \ |
1da177e4 | 804 | movl %esp,%eax; \ |
02cf94c3 | 805 | call fn; \ |
55f327fa | 806 | jmp ret_from_intr; \ |
47a55cd7 JB |
807 | CFI_ENDPROC; \ |
808 | ENDPROC(name) | |
1da177e4 | 809 | |
02cf94c3 TH |
810 | #define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) |
811 | ||
1da177e4 | 812 | /* The include is where all of the SMP etc. interrupts come from */ |
1164dd00 | 813 | #include <asm/entry_arch.h> |
1da177e4 | 814 | |
1da177e4 | 815 | ENTRY(coprocessor_error) |
fe7cacc1 | 816 | RING0_INT_FRAME |
1da177e4 | 817 | pushl $0 |
fe7cacc1 | 818 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 819 | pushl $do_coprocessor_error |
fe7cacc1 | 820 | CFI_ADJUST_CFA_OFFSET 4 |
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 |
1da177e4 | 827 | pushl $0 |
fe7cacc1 | 828 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 829 | pushl $do_simd_coprocessor_error |
fe7cacc1 | 830 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 831 | jmp error_code |
fe7cacc1 | 832 | CFI_ENDPROC |
47a55cd7 | 833 | END(simd_coprocessor_error) |
1da177e4 LT |
834 | |
835 | ENTRY(device_not_available) | |
fe7cacc1 | 836 | RING0_INT_FRAME |
1da177e4 | 837 | pushl $-1 # mark this as an int |
fe7cacc1 | 838 | CFI_ADJUST_CFA_OFFSET 4 |
7643e9b9 | 839 | pushl $do_device_not_available |
fe7cacc1 | 840 | CFI_ADJUST_CFA_OFFSET 4 |
7643e9b9 | 841 | jmp error_code |
fe7cacc1 | 842 | CFI_ENDPROC |
47a55cd7 | 843 | END(device_not_available) |
1da177e4 | 844 | |
d3561b7f RR |
845 | #ifdef CONFIG_PARAVIRT |
846 | ENTRY(native_iret) | |
3701d863 | 847 | iret |
d3561b7f RR |
848 | .section __ex_table,"a" |
849 | .align 4 | |
3701d863 | 850 | .long native_iret, iret_exc |
d3561b7f | 851 | .previous |
47a55cd7 | 852 | END(native_iret) |
d3561b7f | 853 | |
d75cd22f | 854 | ENTRY(native_irq_enable_sysexit) |
d3561b7f RR |
855 | sti |
856 | sysexit | |
d75cd22f | 857 | END(native_irq_enable_sysexit) |
d3561b7f RR |
858 | #endif |
859 | ||
1da177e4 | 860 | ENTRY(overflow) |
fe7cacc1 | 861 | RING0_INT_FRAME |
1da177e4 | 862 | pushl $0 |
fe7cacc1 | 863 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 864 | pushl $do_overflow |
fe7cacc1 | 865 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 866 | jmp error_code |
fe7cacc1 | 867 | CFI_ENDPROC |
47a55cd7 | 868 | END(overflow) |
1da177e4 LT |
869 | |
870 | ENTRY(bounds) | |
fe7cacc1 | 871 | RING0_INT_FRAME |
1da177e4 | 872 | pushl $0 |
fe7cacc1 | 873 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 874 | pushl $do_bounds |
fe7cacc1 | 875 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 876 | jmp error_code |
fe7cacc1 | 877 | CFI_ENDPROC |
47a55cd7 | 878 | END(bounds) |
1da177e4 LT |
879 | |
880 | ENTRY(invalid_op) | |
fe7cacc1 | 881 | RING0_INT_FRAME |
1da177e4 | 882 | pushl $0 |
fe7cacc1 | 883 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 884 | pushl $do_invalid_op |
fe7cacc1 | 885 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 886 | jmp error_code |
fe7cacc1 | 887 | CFI_ENDPROC |
47a55cd7 | 888 | END(invalid_op) |
1da177e4 LT |
889 | |
890 | ENTRY(coprocessor_segment_overrun) | |
fe7cacc1 | 891 | RING0_INT_FRAME |
1da177e4 | 892 | pushl $0 |
fe7cacc1 | 893 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 894 | pushl $do_coprocessor_segment_overrun |
fe7cacc1 | 895 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 896 | jmp error_code |
fe7cacc1 | 897 | CFI_ENDPROC |
47a55cd7 | 898 | END(coprocessor_segment_overrun) |
1da177e4 LT |
899 | |
900 | ENTRY(invalid_TSS) | |
fe7cacc1 | 901 | RING0_EC_FRAME |
1da177e4 | 902 | pushl $do_invalid_TSS |
fe7cacc1 | 903 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 904 | jmp error_code |
fe7cacc1 | 905 | CFI_ENDPROC |
47a55cd7 | 906 | END(invalid_TSS) |
1da177e4 LT |
907 | |
908 | ENTRY(segment_not_present) | |
fe7cacc1 | 909 | RING0_EC_FRAME |
1da177e4 | 910 | pushl $do_segment_not_present |
fe7cacc1 | 911 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 912 | jmp error_code |
fe7cacc1 | 913 | CFI_ENDPROC |
47a55cd7 | 914 | END(segment_not_present) |
1da177e4 LT |
915 | |
916 | ENTRY(stack_segment) | |
fe7cacc1 | 917 | RING0_EC_FRAME |
1da177e4 | 918 | pushl $do_stack_segment |
fe7cacc1 | 919 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 920 | jmp error_code |
fe7cacc1 | 921 | CFI_ENDPROC |
47a55cd7 | 922 | END(stack_segment) |
1da177e4 | 923 | |
1da177e4 | 924 | ENTRY(alignment_check) |
fe7cacc1 | 925 | RING0_EC_FRAME |
1da177e4 | 926 | pushl $do_alignment_check |
fe7cacc1 | 927 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 928 | jmp error_code |
fe7cacc1 | 929 | CFI_ENDPROC |
47a55cd7 | 930 | END(alignment_check) |
1da177e4 | 931 | |
d28c4393 P |
932 | ENTRY(divide_error) |
933 | RING0_INT_FRAME | |
934 | pushl $0 # no error code | |
935 | CFI_ADJUST_CFA_OFFSET 4 | |
936 | pushl $do_divide_error | |
fe7cacc1 | 937 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 938 | jmp error_code |
fe7cacc1 | 939 | CFI_ENDPROC |
47a55cd7 | 940 | END(divide_error) |
1da177e4 LT |
941 | |
942 | #ifdef CONFIG_X86_MCE | |
943 | ENTRY(machine_check) | |
fe7cacc1 | 944 | RING0_INT_FRAME |
1da177e4 | 945 | pushl $0 |
fe7cacc1 | 946 | CFI_ADJUST_CFA_OFFSET 4 |
d2f6f7ae | 947 | pushl machine_check_vector |
fe7cacc1 | 948 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 949 | jmp error_code |
fe7cacc1 | 950 | CFI_ENDPROC |
47a55cd7 | 951 | END(machine_check) |
1da177e4 LT |
952 | #endif |
953 | ||
954 | ENTRY(spurious_interrupt_bug) | |
fe7cacc1 | 955 | RING0_INT_FRAME |
1da177e4 | 956 | pushl $0 |
fe7cacc1 | 957 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 958 | pushl $do_spurious_interrupt_bug |
fe7cacc1 | 959 | CFI_ADJUST_CFA_OFFSET 4 |
1da177e4 | 960 | jmp error_code |
fe7cacc1 | 961 | CFI_ENDPROC |
47a55cd7 | 962 | END(spurious_interrupt_bug) |
1da177e4 | 963 | |
02ba1a32 AK |
964 | ENTRY(kernel_thread_helper) |
965 | pushl $0 # fake return address for unwinder | |
966 | CFI_STARTPROC | |
967 | movl %edx,%eax | |
968 | push %edx | |
969 | CFI_ADJUST_CFA_OFFSET 4 | |
970 | call *%ebx | |
971 | push %eax | |
972 | CFI_ADJUST_CFA_OFFSET 4 | |
973 | call do_exit | |
5f5db591 | 974 | ud2 # padding for call trace |
02ba1a32 AK |
975 | CFI_ENDPROC |
976 | ENDPROC(kernel_thread_helper) | |
977 | ||
5ead97c8 | 978 | #ifdef CONFIG_XEN |
e2a81baf JF |
979 | /* Xen doesn't set %esp to be precisely what the normal sysenter |
980 | entrypoint expects, so fix it up before using the normal path. */ | |
981 | ENTRY(xen_sysenter_target) | |
982 | RING0_INT_FRAME | |
983 | addl $5*4, %esp /* remove xen-provided frame */ | |
2ddf9b7b | 984 | CFI_ADJUST_CFA_OFFSET -5*4 |
e2a81baf | 985 | jmp sysenter_past_esp |
557d7d4e | 986 | CFI_ENDPROC |
e2a81baf | 987 | |
5ead97c8 JF |
988 | ENTRY(xen_hypervisor_callback) |
989 | CFI_STARTPROC | |
990 | pushl $0 | |
991 | CFI_ADJUST_CFA_OFFSET 4 | |
992 | SAVE_ALL | |
993 | TRACE_IRQS_OFF | |
9ec2b804 JF |
994 | |
995 | /* Check to see if we got the event in the critical | |
996 | region in xen_iret_direct, after we've reenabled | |
997 | events and checked for pending events. This simulates | |
998 | iret instruction's behaviour where it delivers a | |
999 | pending interrupt when enabling interrupts. */ | |
1000 | movl PT_EIP(%esp),%eax | |
1001 | cmpl $xen_iret_start_crit,%eax | |
1002 | jb 1f | |
1003 | cmpl $xen_iret_end_crit,%eax | |
1004 | jae 1f | |
1005 | ||
0f2c8769 | 1006 | jmp xen_iret_crit_fixup |
e2a81baf | 1007 | |
e2a81baf | 1008 | ENTRY(xen_do_upcall) |
b77797fb | 1009 | 1: mov %esp, %eax |
5ead97c8 JF |
1010 | call xen_evtchn_do_upcall |
1011 | jmp ret_from_intr | |
1012 | CFI_ENDPROC | |
1013 | ENDPROC(xen_hypervisor_callback) | |
1014 | ||
1015 | # Hypervisor uses this for application faults while it executes. | |
1016 | # We get here for two reasons: | |
1017 | # 1. Fault while reloading DS, ES, FS or GS | |
1018 | # 2. Fault while executing IRET | |
1019 | # Category 1 we fix up by reattempting the load, and zeroing the segment | |
1020 | # register if the load fails. | |
1021 | # Category 2 we fix up by jumping to do_iret_error. We cannot use the | |
1022 | # normal Linux return path in this case because if we use the IRET hypercall | |
1023 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1024 | # We distinguish between categories by maintaining a status value in EAX. | |
1025 | ENTRY(xen_failsafe_callback) | |
1026 | CFI_STARTPROC | |
1027 | pushl %eax | |
1028 | CFI_ADJUST_CFA_OFFSET 4 | |
1029 | movl $1,%eax | |
1030 | 1: mov 4(%esp),%ds | |
1031 | 2: mov 8(%esp),%es | |
1032 | 3: mov 12(%esp),%fs | |
1033 | 4: mov 16(%esp),%gs | |
1034 | testl %eax,%eax | |
1035 | popl %eax | |
1036 | CFI_ADJUST_CFA_OFFSET -4 | |
1037 | lea 16(%esp),%esp | |
1038 | CFI_ADJUST_CFA_OFFSET -16 | |
1039 | jz 5f | |
1040 | addl $16,%esp | |
1041 | jmp iret_exc # EAX != 0 => Category 2 (Bad IRET) | |
1042 | 5: pushl $0 # EAX == 0 => Category 1 (Bad segment) | |
1043 | CFI_ADJUST_CFA_OFFSET 4 | |
1044 | SAVE_ALL | |
1045 | jmp ret_from_exception | |
1046 | CFI_ENDPROC | |
1047 | ||
1048 | .section .fixup,"ax" | |
1049 | 6: xorl %eax,%eax | |
1050 | movl %eax,4(%esp) | |
1051 | jmp 1b | |
1052 | 7: xorl %eax,%eax | |
1053 | movl %eax,8(%esp) | |
1054 | jmp 2b | |
1055 | 8: xorl %eax,%eax | |
1056 | movl %eax,12(%esp) | |
1057 | jmp 3b | |
1058 | 9: xorl %eax,%eax | |
1059 | movl %eax,16(%esp) | |
1060 | jmp 4b | |
1061 | .previous | |
1062 | .section __ex_table,"a" | |
1063 | .align 4 | |
1064 | .long 1b,6b | |
1065 | .long 2b,7b | |
1066 | .long 3b,8b | |
1067 | .long 4b,9b | |
1068 | .previous | |
1069 | ENDPROC(xen_failsafe_callback) | |
1070 | ||
1071 | #endif /* CONFIG_XEN */ | |
1072 | ||
606576ce | 1073 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
1074 | #ifdef CONFIG_DYNAMIC_FTRACE |
1075 | ||
1076 | ENTRY(mcount) | |
d61f82d0 SR |
1077 | ret |
1078 | END(mcount) | |
1079 | ||
1080 | ENTRY(ftrace_caller) | |
60a7ecf4 SR |
1081 | cmpl $0, function_trace_stop |
1082 | jne ftrace_stub | |
1083 | ||
d61f82d0 SR |
1084 | pushl %eax |
1085 | pushl %ecx | |
1086 | pushl %edx | |
1087 | movl 0xc(%esp), %eax | |
1088 | movl 0x4(%ebp), %edx | |
395a59d0 | 1089 | subl $MCOUNT_INSN_SIZE, %eax |
d61f82d0 SR |
1090 | |
1091 | .globl ftrace_call | |
1092 | ftrace_call: | |
1093 | call ftrace_stub | |
1094 | ||
1095 | popl %edx | |
1096 | popl %ecx | |
1097 | popl %eax | |
5a45cfe1 SR |
1098 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1099 | .globl ftrace_graph_call | |
1100 | ftrace_graph_call: | |
1101 | jmp ftrace_stub | |
1102 | #endif | |
d61f82d0 SR |
1103 | |
1104 | .globl ftrace_stub | |
1105 | ftrace_stub: | |
1106 | ret | |
1107 | END(ftrace_caller) | |
1108 | ||
1109 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
1110 | ||
16444a8a | 1111 | ENTRY(mcount) |
60a7ecf4 SR |
1112 | cmpl $0, function_trace_stop |
1113 | jne ftrace_stub | |
1114 | ||
16444a8a ACM |
1115 | cmpl $ftrace_stub, ftrace_trace_function |
1116 | jnz trace | |
fb52607a | 1117 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
c2324b69 | 1118 | cmpl $ftrace_stub, ftrace_graph_return |
fb52607a | 1119 | jnz ftrace_graph_caller |
e49dc19c SR |
1120 | |
1121 | cmpl $ftrace_graph_entry_stub, ftrace_graph_entry | |
1122 | jnz ftrace_graph_caller | |
caf4b323 | 1123 | #endif |
16444a8a ACM |
1124 | .globl ftrace_stub |
1125 | ftrace_stub: | |
1126 | ret | |
1127 | ||
1128 | /* taken from glibc */ | |
1129 | trace: | |
1130 | pushl %eax | |
1131 | pushl %ecx | |
1132 | pushl %edx | |
1133 | movl 0xc(%esp), %eax | |
1134 | movl 0x4(%ebp), %edx | |
395a59d0 | 1135 | subl $MCOUNT_INSN_SIZE, %eax |
16444a8a | 1136 | |
d61f82d0 | 1137 | call *ftrace_trace_function |
16444a8a ACM |
1138 | |
1139 | popl %edx | |
1140 | popl %ecx | |
1141 | popl %eax | |
16444a8a ACM |
1142 | jmp ftrace_stub |
1143 | END(mcount) | |
d61f82d0 | 1144 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 1145 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 1146 | |
fb52607a FW |
1147 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1148 | ENTRY(ftrace_graph_caller) | |
e7d3737e FW |
1149 | cmpl $0, function_trace_stop |
1150 | jne ftrace_stub | |
1151 | ||
caf4b323 FW |
1152 | pushl %eax |
1153 | pushl %ecx | |
1154 | pushl %edx | |
1dc1c6ad | 1155 | movl 0xc(%esp), %edx |
caf4b323 | 1156 | lea 0x4(%ebp), %eax |
bb4304c7 | 1157 | subl $MCOUNT_INSN_SIZE, %edx |
caf4b323 | 1158 | call prepare_ftrace_return |
caf4b323 FW |
1159 | popl %edx |
1160 | popl %ecx | |
1161 | popl %eax | |
e7d3737e | 1162 | ret |
fb52607a | 1163 | END(ftrace_graph_caller) |
caf4b323 FW |
1164 | |
1165 | .globl return_to_handler | |
1166 | return_to_handler: | |
1167 | pushl $0 | |
1168 | pushl %eax | |
1169 | pushl %ecx | |
1170 | pushl %edx | |
1171 | call ftrace_return_to_handler | |
1172 | movl %eax, 0xc(%esp) | |
1173 | popl %edx | |
1174 | popl %ecx | |
1175 | popl %eax | |
1176 | ret | |
e7d3737e | 1177 | #endif |
16444a8a | 1178 | |
bb152f53 | 1179 | .section .rodata,"a" |
541054d9 | 1180 | #include "syscall_table_32.S" |
1da177e4 LT |
1181 | |
1182 | syscall_table_size=(.-sys_call_table) | |
d211af05 AH |
1183 | |
1184 | /* | |
1185 | * Some functions should be protected against kprobes | |
1186 | */ | |
1187 | .pushsection .kprobes.text, "ax" | |
1188 | ||
1189 | ENTRY(page_fault) | |
1190 | RING0_EC_FRAME | |
1191 | pushl $do_page_fault | |
1192 | CFI_ADJUST_CFA_OFFSET 4 | |
1193 | ALIGN | |
1194 | error_code: | |
ccbeed3a TH |
1195 | /* the function address is in %gs's slot on the stack */ |
1196 | pushl %fs | |
1197 | CFI_ADJUST_CFA_OFFSET 4 | |
1198 | /*CFI_REL_OFFSET fs, 0*/ | |
d211af05 AH |
1199 | pushl %es |
1200 | CFI_ADJUST_CFA_OFFSET 4 | |
1201 | /*CFI_REL_OFFSET es, 0*/ | |
1202 | pushl %ds | |
1203 | CFI_ADJUST_CFA_OFFSET 4 | |
1204 | /*CFI_REL_OFFSET ds, 0*/ | |
1205 | pushl %eax | |
1206 | CFI_ADJUST_CFA_OFFSET 4 | |
1207 | CFI_REL_OFFSET eax, 0 | |
1208 | pushl %ebp | |
1209 | CFI_ADJUST_CFA_OFFSET 4 | |
1210 | CFI_REL_OFFSET ebp, 0 | |
1211 | pushl %edi | |
1212 | CFI_ADJUST_CFA_OFFSET 4 | |
1213 | CFI_REL_OFFSET edi, 0 | |
1214 | pushl %esi | |
1215 | CFI_ADJUST_CFA_OFFSET 4 | |
1216 | CFI_REL_OFFSET esi, 0 | |
1217 | pushl %edx | |
1218 | CFI_ADJUST_CFA_OFFSET 4 | |
1219 | CFI_REL_OFFSET edx, 0 | |
1220 | pushl %ecx | |
1221 | CFI_ADJUST_CFA_OFFSET 4 | |
1222 | CFI_REL_OFFSET ecx, 0 | |
1223 | pushl %ebx | |
1224 | CFI_ADJUST_CFA_OFFSET 4 | |
1225 | CFI_REL_OFFSET ebx, 0 | |
1226 | cld | |
d211af05 AH |
1227 | movl $(__KERNEL_PERCPU), %ecx |
1228 | movl %ecx, %fs | |
1229 | UNWIND_ESPFIX_STACK | |
ccbeed3a TH |
1230 | GS_TO_REG %ecx |
1231 | movl PT_GS(%esp), %edi # get the function address | |
d211af05 AH |
1232 | movl PT_ORIG_EAX(%esp), %edx # get the error code |
1233 | movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart | |
ccbeed3a TH |
1234 | REG_TO_PTGS %ecx |
1235 | SET_KERNEL_GS %ecx | |
d211af05 AH |
1236 | movl $(__USER_DS), %ecx |
1237 | movl %ecx, %ds | |
1238 | movl %ecx, %es | |
1239 | TRACE_IRQS_OFF | |
1240 | movl %esp,%eax # pt_regs pointer | |
1241 | call *%edi | |
1242 | jmp ret_from_exception | |
1243 | CFI_ENDPROC | |
1244 | END(page_fault) | |
1245 | ||
1246 | /* | |
1247 | * Debug traps and NMI can happen at the one SYSENTER instruction | |
1248 | * that sets up the real kernel stack. Check here, since we can't | |
1249 | * allow the wrong stack to be used. | |
1250 | * | |
1251 | * "TSS_sysenter_sp0+12" is because the NMI/debug handler will have | |
1252 | * already pushed 3 words if it hits on the sysenter instruction: | |
1253 | * eflags, cs and eip. | |
1254 | * | |
1255 | * We just load the right stack, and push the three (known) values | |
1256 | * by hand onto the new stack - while updating the return eip past | |
1257 | * the instruction that would have done it for sysenter. | |
1258 | */ | |
f0d96110 TH |
1259 | .macro FIX_STACK offset ok label |
1260 | cmpw $__KERNEL_CS, 4(%esp) | |
1261 | jne \ok | |
1262 | \label: | |
1263 | movl TSS_sysenter_sp0 + \offset(%esp), %esp | |
1264 | CFI_DEF_CFA esp, 0 | |
1265 | CFI_UNDEFINED eip | |
1266 | pushfl | |
1267 | CFI_ADJUST_CFA_OFFSET 4 | |
1268 | pushl $__KERNEL_CS | |
1269 | CFI_ADJUST_CFA_OFFSET 4 | |
1270 | pushl $sysenter_past_esp | |
1271 | CFI_ADJUST_CFA_OFFSET 4 | |
d211af05 | 1272 | CFI_REL_OFFSET eip, 0 |
f0d96110 | 1273 | .endm |
d211af05 AH |
1274 | |
1275 | ENTRY(debug) | |
1276 | RING0_INT_FRAME | |
1277 | cmpl $ia32_sysenter_target,(%esp) | |
1278 | jne debug_stack_correct | |
f0d96110 | 1279 | FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn |
d211af05 AH |
1280 | debug_stack_correct: |
1281 | pushl $-1 # mark this as an int | |
1282 | CFI_ADJUST_CFA_OFFSET 4 | |
1283 | SAVE_ALL | |
1284 | TRACE_IRQS_OFF | |
1285 | xorl %edx,%edx # error code 0 | |
1286 | movl %esp,%eax # pt_regs pointer | |
1287 | call do_debug | |
1288 | jmp ret_from_exception | |
1289 | CFI_ENDPROC | |
1290 | END(debug) | |
1291 | ||
1292 | /* | |
1293 | * NMI is doubly nasty. It can happen _while_ we're handling | |
1294 | * a debug fault, and the debug fault hasn't yet been able to | |
1295 | * clear up the stack. So we first check whether we got an | |
1296 | * NMI on the sysenter entry path, but after that we need to | |
1297 | * check whether we got an NMI on the debug path where the debug | |
1298 | * fault happened on the sysenter path. | |
1299 | */ | |
1300 | ENTRY(nmi) | |
1301 | RING0_INT_FRAME | |
1302 | pushl %eax | |
1303 | CFI_ADJUST_CFA_OFFSET 4 | |
1304 | movl %ss, %eax | |
1305 | cmpw $__ESPFIX_SS, %ax | |
1306 | popl %eax | |
1307 | CFI_ADJUST_CFA_OFFSET -4 | |
1308 | je nmi_espfix_stack | |
1309 | cmpl $ia32_sysenter_target,(%esp) | |
1310 | je nmi_stack_fixup | |
1311 | pushl %eax | |
1312 | CFI_ADJUST_CFA_OFFSET 4 | |
1313 | movl %esp,%eax | |
1314 | /* Do not access memory above the end of our stack page, | |
1315 | * it might not exist. | |
1316 | */ | |
1317 | andl $(THREAD_SIZE-1),%eax | |
1318 | cmpl $(THREAD_SIZE-20),%eax | |
1319 | popl %eax | |
1320 | CFI_ADJUST_CFA_OFFSET -4 | |
1321 | jae nmi_stack_correct | |
1322 | cmpl $ia32_sysenter_target,12(%esp) | |
1323 | je nmi_debug_stack_check | |
1324 | nmi_stack_correct: | |
1325 | /* We have a RING0_INT_FRAME here */ | |
1326 | pushl %eax | |
1327 | CFI_ADJUST_CFA_OFFSET 4 | |
1328 | SAVE_ALL | |
d211af05 AH |
1329 | xorl %edx,%edx # zero error code |
1330 | movl %esp,%eax # pt_regs pointer | |
1331 | call do_nmi | |
1332 | jmp restore_nocheck_notrace | |
1333 | CFI_ENDPROC | |
1334 | ||
1335 | nmi_stack_fixup: | |
1336 | RING0_INT_FRAME | |
f0d96110 | 1337 | FIX_STACK 12, nmi_stack_correct, 1 |
d211af05 AH |
1338 | jmp nmi_stack_correct |
1339 | ||
1340 | nmi_debug_stack_check: | |
1341 | /* We have a RING0_INT_FRAME here */ | |
1342 | cmpw $__KERNEL_CS,16(%esp) | |
1343 | jne nmi_stack_correct | |
1344 | cmpl $debug,(%esp) | |
1345 | jb nmi_stack_correct | |
1346 | cmpl $debug_esp_fix_insn,(%esp) | |
1347 | ja nmi_stack_correct | |
f0d96110 | 1348 | FIX_STACK 24, nmi_stack_correct, 1 |
d211af05 AH |
1349 | jmp nmi_stack_correct |
1350 | ||
1351 | nmi_espfix_stack: | |
1352 | /* We have a RING0_INT_FRAME here. | |
1353 | * | |
1354 | * create the pointer to lss back | |
1355 | */ | |
1356 | pushl %ss | |
1357 | CFI_ADJUST_CFA_OFFSET 4 | |
1358 | pushl %esp | |
1359 | CFI_ADJUST_CFA_OFFSET 4 | |
bda3a897 | 1360 | addl $4, (%esp) |
d211af05 AH |
1361 | /* copy the iret frame of 12 bytes */ |
1362 | .rept 3 | |
1363 | pushl 16(%esp) | |
1364 | CFI_ADJUST_CFA_OFFSET 4 | |
1365 | .endr | |
1366 | pushl %eax | |
1367 | CFI_ADJUST_CFA_OFFSET 4 | |
1368 | SAVE_ALL | |
d211af05 AH |
1369 | FIXUP_ESPFIX_STACK # %eax == %esp |
1370 | xorl %edx,%edx # zero error code | |
1371 | call do_nmi | |
1372 | RESTORE_REGS | |
1373 | lss 12+4(%esp), %esp # back to espfix stack | |
1374 | CFI_ADJUST_CFA_OFFSET -24 | |
1375 | jmp irq_return | |
1376 | CFI_ENDPROC | |
1377 | END(nmi) | |
1378 | ||
1379 | ENTRY(int3) | |
1380 | RING0_INT_FRAME | |
1381 | pushl $-1 # mark this as an int | |
1382 | CFI_ADJUST_CFA_OFFSET 4 | |
1383 | SAVE_ALL | |
1384 | TRACE_IRQS_OFF | |
1385 | xorl %edx,%edx # zero error code | |
1386 | movl %esp,%eax # pt_regs pointer | |
1387 | call do_int3 | |
1388 | jmp ret_from_exception | |
1389 | CFI_ENDPROC | |
1390 | END(int3) | |
1391 | ||
1392 | ENTRY(general_protection) | |
1393 | RING0_EC_FRAME | |
1394 | pushl $do_general_protection | |
1395 | CFI_ADJUST_CFA_OFFSET 4 | |
1396 | jmp error_code | |
1397 | CFI_ENDPROC | |
1398 | END(general_protection) | |
1399 | ||
1400 | /* | |
1401 | * End of kprobes section | |
1402 | */ | |
1403 | .popsection |