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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/entry.S | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs | |
6 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> | |
7 | * | |
8 | * $Id$ | |
9 | */ | |
10 | ||
11 | /* | |
12 | * entry.S contains the system-call and fault low-level handling routines. | |
13 | * | |
14 | * NOTE: This code handles signal-recognition, which happens every time | |
15 | * after an interrupt and after each system call. | |
16 | * | |
17 | * Normal syscalls and interrupts don't save a full stack frame, this is | |
18 | * only done for syscall tracing, signals or fork/exec et.al. | |
19 | * | |
20 | * A note on terminology: | |
21 | * - top of stack: Architecture defined interrupt frame from SS to RIP | |
22 | * at the top of the kernel process stack. | |
23 | * - partial stack frame: partially saved registers upto R11. | |
24 | * - full stack frame: Like partial stack frame, but all register saved. | |
25 | * | |
26 | * TODO: | |
27 | * - schedule it carefully for the final hardware. | |
28 | */ | |
29 | ||
30 | #define ASSEMBLY 1 | |
31 | #include <linux/config.h> | |
32 | #include <linux/linkage.h> | |
33 | #include <asm/segment.h> | |
34 | #include <asm/smp.h> | |
35 | #include <asm/cache.h> | |
36 | #include <asm/errno.h> | |
37 | #include <asm/dwarf2.h> | |
38 | #include <asm/calling.h> | |
e2d5df93 | 39 | #include <asm/asm-offsets.h> |
1da177e4 LT |
40 | #include <asm/msr.h> |
41 | #include <asm/unistd.h> | |
42 | #include <asm/thread_info.h> | |
43 | #include <asm/hw_irq.h> | |
44 | ||
45 | .code64 | |
46 | ||
dc37db4d | 47 | #ifndef CONFIG_PREEMPT |
1da177e4 LT |
48 | #define retint_kernel retint_restore_args |
49 | #endif | |
50 | ||
51 | /* | |
52 | * C code is not supposed to know about undefined top of stack. Every time | |
53 | * a C function with an pt_regs argument is called from the SYSCALL based | |
54 | * fast path FIXUP_TOP_OF_STACK is needed. | |
55 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs | |
56 | * manipulation. | |
57 | */ | |
58 | ||
59 | /* %rsp:at FRAMEEND */ | |
60 | .macro FIXUP_TOP_OF_STACK tmp | |
61 | movq %gs:pda_oldrsp,\tmp | |
62 | movq \tmp,RSP(%rsp) | |
63 | movq $__USER_DS,SS(%rsp) | |
64 | movq $__USER_CS,CS(%rsp) | |
65 | movq $-1,RCX(%rsp) | |
66 | movq R11(%rsp),\tmp /* get eflags */ | |
67 | movq \tmp,EFLAGS(%rsp) | |
68 | .endm | |
69 | ||
70 | .macro RESTORE_TOP_OF_STACK tmp,offset=0 | |
71 | movq RSP-\offset(%rsp),\tmp | |
72 | movq \tmp,%gs:pda_oldrsp | |
73 | movq EFLAGS-\offset(%rsp),\tmp | |
74 | movq \tmp,R11-\offset(%rsp) | |
75 | .endm | |
76 | ||
77 | .macro FAKE_STACK_FRAME child_rip | |
78 | /* push in order ss, rsp, eflags, cs, rip */ | |
3829ee6b | 79 | xorl %eax, %eax |
1da177e4 LT |
80 | pushq %rax /* ss */ |
81 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 82 | /*CFI_REL_OFFSET ss,0*/ |
1da177e4 LT |
83 | pushq %rax /* rsp */ |
84 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 85 | CFI_REL_OFFSET rsp,0 |
1da177e4 LT |
86 | pushq $(1<<9) /* eflags - interrupts on */ |
87 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 88 | /*CFI_REL_OFFSET rflags,0*/ |
1da177e4 LT |
89 | pushq $__KERNEL_CS /* cs */ |
90 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 91 | /*CFI_REL_OFFSET cs,0*/ |
1da177e4 LT |
92 | pushq \child_rip /* rip */ |
93 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 94 | CFI_REL_OFFSET rip,0 |
1da177e4 LT |
95 | pushq %rax /* orig rax */ |
96 | CFI_ADJUST_CFA_OFFSET 8 | |
97 | .endm | |
98 | ||
99 | .macro UNFAKE_STACK_FRAME | |
100 | addq $8*6, %rsp | |
101 | CFI_ADJUST_CFA_OFFSET -(6*8) | |
102 | .endm | |
103 | ||
7effaa88 JB |
104 | .macro CFI_DEFAULT_STACK start=1 |
105 | .if \start | |
106 | CFI_STARTPROC simple | |
107 | CFI_DEF_CFA rsp,SS+8 | |
108 | .else | |
109 | CFI_DEF_CFA_OFFSET SS+8 | |
110 | .endif | |
111 | CFI_REL_OFFSET r15,R15 | |
112 | CFI_REL_OFFSET r14,R14 | |
113 | CFI_REL_OFFSET r13,R13 | |
114 | CFI_REL_OFFSET r12,R12 | |
115 | CFI_REL_OFFSET rbp,RBP | |
116 | CFI_REL_OFFSET rbx,RBX | |
117 | CFI_REL_OFFSET r11,R11 | |
118 | CFI_REL_OFFSET r10,R10 | |
119 | CFI_REL_OFFSET r9,R9 | |
120 | CFI_REL_OFFSET r8,R8 | |
121 | CFI_REL_OFFSET rax,RAX | |
122 | CFI_REL_OFFSET rcx,RCX | |
123 | CFI_REL_OFFSET rdx,RDX | |
124 | CFI_REL_OFFSET rsi,RSI | |
125 | CFI_REL_OFFSET rdi,RDI | |
126 | CFI_REL_OFFSET rip,RIP | |
127 | /*CFI_REL_OFFSET cs,CS*/ | |
128 | /*CFI_REL_OFFSET rflags,EFLAGS*/ | |
129 | CFI_REL_OFFSET rsp,RSP | |
130 | /*CFI_REL_OFFSET ss,SS*/ | |
1da177e4 LT |
131 | .endm |
132 | /* | |
133 | * A newly forked process directly context switches into this. | |
134 | */ | |
135 | /* rdi: prev */ | |
136 | ENTRY(ret_from_fork) | |
1da177e4 LT |
137 | CFI_DEFAULT_STACK |
138 | call schedule_tail | |
139 | GET_THREAD_INFO(%rcx) | |
140 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx) | |
141 | jnz rff_trace | |
142 | rff_action: | |
143 | RESTORE_REST | |
144 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? | |
145 | je int_ret_from_sys_call | |
146 | testl $_TIF_IA32,threadinfo_flags(%rcx) | |
147 | jnz int_ret_from_sys_call | |
148 | RESTORE_TOP_OF_STACK %rdi,ARGOFFSET | |
149 | jmp ret_from_sys_call | |
150 | rff_trace: | |
151 | movq %rsp,%rdi | |
152 | call syscall_trace_leave | |
153 | GET_THREAD_INFO(%rcx) | |
154 | jmp rff_action | |
155 | CFI_ENDPROC | |
156 | ||
157 | /* | |
158 | * System call entry. Upto 6 arguments in registers are supported. | |
159 | * | |
160 | * SYSCALL does not save anything on the stack and does not change the | |
161 | * stack pointer. | |
162 | */ | |
163 | ||
164 | /* | |
165 | * Register setup: | |
166 | * rax system call number | |
167 | * rdi arg0 | |
168 | * rcx return address for syscall/sysret, C arg3 | |
169 | * rsi arg1 | |
170 | * rdx arg2 | |
171 | * r10 arg3 (--> moved to rcx for C) | |
172 | * r8 arg4 | |
173 | * r9 arg5 | |
174 | * r11 eflags for syscall/sysret, temporary for C | |
175 | * r12-r15,rbp,rbx saved by C code, not touched. | |
176 | * | |
177 | * Interrupts are off on entry. | |
178 | * Only called from user space. | |
179 | * | |
180 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
181 | * and report it properly in ps. Unfortunately we haven't. | |
182 | */ | |
183 | ||
184 | ENTRY(system_call) | |
7effaa88 JB |
185 | CFI_STARTPROC simple |
186 | CFI_DEF_CFA rsp,0 | |
187 | CFI_REGISTER rip,rcx | |
188 | /*CFI_REGISTER rflags,r11*/ | |
1da177e4 LT |
189 | swapgs |
190 | movq %rsp,%gs:pda_oldrsp | |
191 | movq %gs:pda_kernelstack,%rsp | |
192 | sti | |
193 | SAVE_ARGS 8,1 | |
194 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) | |
7effaa88 JB |
195 | movq %rcx,RIP-ARGOFFSET(%rsp) |
196 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 LT |
197 | GET_THREAD_INFO(%rcx) |
198 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx) | |
7effaa88 | 199 | CFI_REMEMBER_STATE |
1da177e4 LT |
200 | jnz tracesys |
201 | cmpq $__NR_syscall_max,%rax | |
202 | ja badsys | |
203 | movq %r10,%rcx | |
204 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
205 | movq %rax,RAX-ARGOFFSET(%rsp) | |
206 | /* | |
207 | * Syscall return path ending with SYSRET (fast path) | |
208 | * Has incomplete stack frame and undefined top of stack. | |
209 | */ | |
210 | .globl ret_from_sys_call | |
211 | ret_from_sys_call: | |
11b854b2 | 212 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 LT |
213 | /* edi: flagmask */ |
214 | sysret_check: | |
215 | GET_THREAD_INFO(%rcx) | |
216 | cli | |
217 | movl threadinfo_flags(%rcx),%edx | |
218 | andl %edi,%edx | |
7effaa88 | 219 | CFI_REMEMBER_STATE |
1da177e4 LT |
220 | jnz sysret_careful |
221 | movq RIP-ARGOFFSET(%rsp),%rcx | |
7effaa88 | 222 | CFI_REGISTER rip,rcx |
1da177e4 | 223 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 224 | /*CFI_REGISTER rflags,r11*/ |
1da177e4 LT |
225 | movq %gs:pda_oldrsp,%rsp |
226 | swapgs | |
227 | sysretq | |
228 | ||
229 | /* Handle reschedules */ | |
230 | /* edx: work, edi: workmask */ | |
231 | sysret_careful: | |
7effaa88 | 232 | CFI_RESTORE_STATE |
1da177e4 LT |
233 | bt $TIF_NEED_RESCHED,%edx |
234 | jnc sysret_signal | |
235 | sti | |
236 | pushq %rdi | |
7effaa88 | 237 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
238 | call schedule |
239 | popq %rdi | |
7effaa88 | 240 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
241 | jmp sysret_check |
242 | ||
243 | /* Handle a signal */ | |
244 | sysret_signal: | |
245 | sti | |
10ffdbb8 AK |
246 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
247 | jz 1f | |
248 | ||
249 | /* Really a signal */ | |
250 | /* edx: work flags (arg3) */ | |
1da177e4 LT |
251 | leaq do_notify_resume(%rip),%rax |
252 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
253 | xorl %esi,%esi # oldset -> arg2 | |
254 | call ptregscall_common | |
10ffdbb8 | 255 | 1: movl $_TIF_NEED_RESCHED,%edi |
1da177e4 LT |
256 | jmp sysret_check |
257 | ||
7effaa88 JB |
258 | badsys: |
259 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
260 | jmp ret_from_sys_call | |
261 | ||
1da177e4 LT |
262 | /* Do syscall tracing */ |
263 | tracesys: | |
7effaa88 | 264 | CFI_RESTORE_STATE |
1da177e4 LT |
265 | SAVE_REST |
266 | movq $-ENOSYS,RAX(%rsp) | |
267 | FIXUP_TOP_OF_STACK %rdi | |
268 | movq %rsp,%rdi | |
269 | call syscall_trace_enter | |
270 | LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */ | |
271 | RESTORE_REST | |
272 | cmpq $__NR_syscall_max,%rax | |
273 | ja 1f | |
274 | movq %r10,%rcx /* fixup for C */ | |
275 | call *sys_call_table(,%rax,8) | |
276 | movq %rax,RAX-ARGOFFSET(%rsp) | |
277 | 1: SAVE_REST | |
278 | movq %rsp,%rdi | |
279 | call syscall_trace_leave | |
280 | RESTORE_TOP_OF_STACK %rbx | |
281 | RESTORE_REST | |
282 | jmp ret_from_sys_call | |
7effaa88 | 283 | CFI_ENDPROC |
1da177e4 | 284 | |
1da177e4 LT |
285 | /* |
286 | * Syscall return path ending with IRET. | |
287 | * Has correct top of stack, but partial stack frame. | |
288 | */ | |
7effaa88 JB |
289 | ENTRY(int_ret_from_sys_call) |
290 | CFI_STARTPROC simple | |
291 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET | |
292 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
293 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
294 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
295 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
296 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
297 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
298 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
299 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
300 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
301 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
302 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
303 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
304 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
305 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 LT |
306 | cli |
307 | testl $3,CS-ARGOFFSET(%rsp) | |
308 | je retint_restore_args | |
309 | movl $_TIF_ALLWORK_MASK,%edi | |
310 | /* edi: mask to check */ | |
311 | int_with_check: | |
312 | GET_THREAD_INFO(%rcx) | |
313 | movl threadinfo_flags(%rcx),%edx | |
314 | andl %edi,%edx | |
315 | jnz int_careful | |
316 | jmp retint_swapgs | |
317 | ||
318 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
319 | /* First do a reschedule test. */ | |
320 | /* edx: work, edi: workmask */ | |
321 | int_careful: | |
322 | bt $TIF_NEED_RESCHED,%edx | |
323 | jnc int_very_careful | |
324 | sti | |
325 | pushq %rdi | |
7effaa88 | 326 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
327 | call schedule |
328 | popq %rdi | |
7effaa88 | 329 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 330 | cli |
1da177e4 LT |
331 | jmp int_with_check |
332 | ||
333 | /* handle signals and tracing -- both require a full stack frame */ | |
334 | int_very_careful: | |
335 | sti | |
336 | SAVE_REST | |
337 | /* Check for syscall exit trace */ | |
338 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
339 | jz int_signal | |
340 | pushq %rdi | |
7effaa88 | 341 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
342 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
343 | call syscall_trace_leave | |
344 | popq %rdi | |
7effaa88 | 345 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 346 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 347 | cli |
1da177e4 LT |
348 | jmp int_restore_rest |
349 | ||
350 | int_signal: | |
351 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
352 | jz 1f | |
353 | movq %rsp,%rdi # &ptregs -> arg1 | |
354 | xorl %esi,%esi # oldset -> arg2 | |
355 | call do_notify_resume | |
356 | 1: movl $_TIF_NEED_RESCHED,%edi | |
357 | int_restore_rest: | |
358 | RESTORE_REST | |
be9e6870 | 359 | cli |
1da177e4 LT |
360 | jmp int_with_check |
361 | CFI_ENDPROC | |
362 | ||
363 | /* | |
364 | * Certain special system calls that need to save a complete full stack frame. | |
365 | */ | |
366 | ||
367 | .macro PTREGSCALL label,func,arg | |
368 | .globl \label | |
369 | \label: | |
370 | leaq \func(%rip),%rax | |
371 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
372 | jmp ptregscall_common | |
373 | .endm | |
374 | ||
7effaa88 JB |
375 | CFI_STARTPROC |
376 | ||
1da177e4 LT |
377 | PTREGSCALL stub_clone, sys_clone, %r8 |
378 | PTREGSCALL stub_fork, sys_fork, %rdi | |
379 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
380 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
381 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
382 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
383 | ||
384 | ENTRY(ptregscall_common) | |
1da177e4 | 385 | popq %r11 |
7effaa88 JB |
386 | CFI_ADJUST_CFA_OFFSET -8 |
387 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
388 | SAVE_REST |
389 | movq %r11, %r15 | |
7effaa88 | 390 | CFI_REGISTER rip, r15 |
1da177e4 LT |
391 | FIXUP_TOP_OF_STACK %r11 |
392 | call *%rax | |
393 | RESTORE_TOP_OF_STACK %r11 | |
394 | movq %r15, %r11 | |
7effaa88 | 395 | CFI_REGISTER rip, r11 |
1da177e4 LT |
396 | RESTORE_REST |
397 | pushq %r11 | |
7effaa88 JB |
398 | CFI_ADJUST_CFA_OFFSET 8 |
399 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
400 | ret |
401 | CFI_ENDPROC | |
402 | ||
403 | ENTRY(stub_execve) | |
404 | CFI_STARTPROC | |
405 | popq %r11 | |
7effaa88 JB |
406 | CFI_ADJUST_CFA_OFFSET -8 |
407 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
408 | SAVE_REST |
409 | movq %r11, %r15 | |
7effaa88 | 410 | CFI_REGISTER rip, r15 |
1da177e4 LT |
411 | FIXUP_TOP_OF_STACK %r11 |
412 | call sys_execve | |
413 | GET_THREAD_INFO(%rcx) | |
414 | bt $TIF_IA32,threadinfo_flags(%rcx) | |
7effaa88 | 415 | CFI_REMEMBER_STATE |
1da177e4 LT |
416 | jc exec_32bit |
417 | RESTORE_TOP_OF_STACK %r11 | |
418 | movq %r15, %r11 | |
7effaa88 | 419 | CFI_REGISTER rip, r11 |
1da177e4 | 420 | RESTORE_REST |
7effaa88 JB |
421 | pushq %r11 |
422 | CFI_ADJUST_CFA_OFFSET 8 | |
423 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
424 | ret |
425 | ||
426 | exec_32bit: | |
7effaa88 | 427 | CFI_RESTORE_STATE |
1da177e4 LT |
428 | movq %rax,RAX(%rsp) |
429 | RESTORE_REST | |
430 | jmp int_ret_from_sys_call | |
431 | CFI_ENDPROC | |
432 | ||
433 | /* | |
434 | * sigreturn is special because it needs to restore all registers on return. | |
435 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
436 | */ | |
437 | ENTRY(stub_rt_sigreturn) | |
438 | CFI_STARTPROC | |
7effaa88 JB |
439 | addq $8, %rsp |
440 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
441 | SAVE_REST |
442 | movq %rsp,%rdi | |
443 | FIXUP_TOP_OF_STACK %r11 | |
444 | call sys_rt_sigreturn | |
445 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
446 | RESTORE_REST | |
447 | jmp int_ret_from_sys_call | |
448 | CFI_ENDPROC | |
449 | ||
7effaa88 JB |
450 | /* |
451 | * initial frame state for interrupts and exceptions | |
452 | */ | |
453 | .macro _frame ref | |
454 | CFI_STARTPROC simple | |
455 | CFI_DEF_CFA rsp,SS+8-\ref | |
456 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
457 | CFI_REL_OFFSET rsp,RSP-\ref | |
458 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
459 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
460 | CFI_REL_OFFSET rip,RIP-\ref | |
461 | .endm | |
462 | ||
463 | /* initial frame state for interrupts (and exceptions without error code) */ | |
464 | #define INTR_FRAME _frame RIP | |
465 | /* initial frame state for exceptions with error code (and interrupts with | |
466 | vector already pushed) */ | |
467 | #define XCPT_FRAME _frame ORIG_RAX | |
468 | ||
1da177e4 LT |
469 | /* |
470 | * Interrupt entry/exit. | |
471 | * | |
472 | * Interrupt entry points save only callee clobbered registers in fast path. | |
473 | * | |
474 | * Entry runs with interrupts off. | |
475 | */ | |
476 | ||
477 | /* 0(%rsp): interrupt number */ | |
478 | .macro interrupt func | |
1da177e4 LT |
479 | cld |
480 | #ifdef CONFIG_DEBUG_INFO | |
481 | SAVE_ALL | |
482 | movq %rsp,%rdi | |
483 | /* | |
484 | * Setup a stack frame pointer. This allows gdb to trace | |
485 | * back to the original stack. | |
486 | */ | |
487 | movq %rsp,%rbp | |
488 | CFI_DEF_CFA_REGISTER rbp | |
489 | #else | |
490 | SAVE_ARGS | |
491 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
492 | #endif | |
493 | testl $3,CS(%rdi) | |
494 | je 1f | |
495 | swapgs | |
3829ee6b | 496 | 1: incl %gs:pda_irqcount # RED-PEN should check preempt count |
1da177e4 | 497 | movq %gs:pda_irqstackptr,%rax |
7effaa88 | 498 | cmoveq %rax,%rsp /*todo This needs CFI annotation! */ |
1da177e4 | 499 | pushq %rdi # save old stack |
7effaa88 | 500 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
501 | call \func |
502 | .endm | |
503 | ||
504 | ENTRY(common_interrupt) | |
7effaa88 | 505 | XCPT_FRAME |
1da177e4 LT |
506 | interrupt do_IRQ |
507 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 508 | ret_from_intr: |
1da177e4 | 509 | popq %rdi |
7effaa88 | 510 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 511 | cli |
3829ee6b | 512 | decl %gs:pda_irqcount |
1da177e4 LT |
513 | #ifdef CONFIG_DEBUG_INFO |
514 | movq RBP(%rdi),%rbp | |
7effaa88 | 515 | CFI_DEF_CFA_REGISTER rsp |
1da177e4 | 516 | #endif |
7effaa88 JB |
517 | leaq ARGOFFSET(%rdi),%rsp /*todo This needs CFI annotation! */ |
518 | exit_intr: | |
1da177e4 LT |
519 | GET_THREAD_INFO(%rcx) |
520 | testl $3,CS-ARGOFFSET(%rsp) | |
521 | je retint_kernel | |
522 | ||
523 | /* Interrupt came from user space */ | |
524 | /* | |
525 | * Has a correct top of stack, but a partial stack frame | |
526 | * %rcx: thread info. Interrupts off. | |
527 | */ | |
528 | retint_with_reschedule: | |
529 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 530 | retint_check: |
1da177e4 LT |
531 | movl threadinfo_flags(%rcx),%edx |
532 | andl %edi,%edx | |
7effaa88 | 533 | CFI_REMEMBER_STATE |
1da177e4 LT |
534 | jnz retint_careful |
535 | retint_swapgs: | |
1da177e4 LT |
536 | swapgs |
537 | retint_restore_args: | |
538 | cli | |
539 | RESTORE_ARGS 0,8,0 | |
540 | iret_label: | |
541 | iretq | |
542 | ||
543 | .section __ex_table,"a" | |
544 | .quad iret_label,bad_iret | |
545 | .previous | |
546 | .section .fixup,"ax" | |
547 | /* force a signal here? this matches i386 behaviour */ | |
548 | /* running with kernel gs */ | |
549 | bad_iret: | |
550 | movq $-9999,%rdi /* better code? */ | |
551 | jmp do_exit | |
552 | .previous | |
553 | ||
7effaa88 | 554 | /* edi: workmask, edx: work */ |
1da177e4 | 555 | retint_careful: |
7effaa88 | 556 | CFI_RESTORE_STATE |
1da177e4 LT |
557 | bt $TIF_NEED_RESCHED,%edx |
558 | jnc retint_signal | |
559 | sti | |
560 | pushq %rdi | |
7effaa88 | 561 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
562 | call schedule |
563 | popq %rdi | |
7effaa88 | 564 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
565 | GET_THREAD_INFO(%rcx) |
566 | cli | |
567 | jmp retint_check | |
568 | ||
569 | retint_signal: | |
10ffdbb8 AK |
570 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
571 | jz retint_swapgs | |
1da177e4 LT |
572 | sti |
573 | SAVE_REST | |
574 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 575 | xorl %esi,%esi # oldset |
1da177e4 LT |
576 | movq %rsp,%rdi # &pt_regs |
577 | call do_notify_resume | |
578 | RESTORE_REST | |
579 | cli | |
10ffdbb8 | 580 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 581 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
582 | jmp retint_check |
583 | ||
584 | #ifdef CONFIG_PREEMPT | |
585 | /* Returning to kernel space. Check if we need preemption */ | |
586 | /* rcx: threadinfo. interrupts off. */ | |
587 | .p2align | |
588 | retint_kernel: | |
589 | cmpl $0,threadinfo_preempt_count(%rcx) | |
590 | jnz retint_restore_args | |
591 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
592 | jnc retint_restore_args | |
593 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
594 | jnc retint_restore_args | |
595 | call preempt_schedule_irq | |
596 | jmp exit_intr | |
597 | #endif | |
598 | CFI_ENDPROC | |
599 | ||
600 | /* | |
601 | * APIC interrupts. | |
602 | */ | |
603 | .macro apicinterrupt num,func | |
7effaa88 | 604 | INTR_FRAME |
1da177e4 | 605 | pushq $\num-256 |
7effaa88 | 606 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
607 | interrupt \func |
608 | jmp ret_from_intr | |
609 | CFI_ENDPROC | |
610 | .endm | |
611 | ||
612 | ENTRY(thermal_interrupt) | |
613 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
614 | ||
89b831ef JS |
615 | ENTRY(threshold_interrupt) |
616 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
617 | ||
1da177e4 LT |
618 | #ifdef CONFIG_SMP |
619 | ENTRY(reschedule_interrupt) | |
620 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
621 | ||
e5bc8b6b AK |
622 | .macro INVALIDATE_ENTRY num |
623 | ENTRY(invalidate_interrupt\num) | |
624 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
625 | .endm | |
626 | ||
627 | INVALIDATE_ENTRY 0 | |
628 | INVALIDATE_ENTRY 1 | |
629 | INVALIDATE_ENTRY 2 | |
630 | INVALIDATE_ENTRY 3 | |
631 | INVALIDATE_ENTRY 4 | |
632 | INVALIDATE_ENTRY 5 | |
633 | INVALIDATE_ENTRY 6 | |
634 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
635 | |
636 | ENTRY(call_function_interrupt) | |
637 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
638 | #endif | |
639 | ||
640 | #ifdef CONFIG_X86_LOCAL_APIC | |
641 | ENTRY(apic_timer_interrupt) | |
642 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
643 | ||
644 | ENTRY(error_interrupt) | |
645 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
646 | ||
647 | ENTRY(spurious_interrupt) | |
648 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
649 | #endif | |
650 | ||
651 | /* | |
652 | * Exception entry points. | |
653 | */ | |
654 | .macro zeroentry sym | |
7effaa88 | 655 | INTR_FRAME |
1da177e4 | 656 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 657 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 658 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 659 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
660 | leaq \sym(%rip),%rax |
661 | jmp error_entry | |
7effaa88 | 662 | CFI_ENDPROC |
1da177e4 LT |
663 | .endm |
664 | ||
665 | .macro errorentry sym | |
7effaa88 | 666 | XCPT_FRAME |
1da177e4 | 667 | pushq %rax |
7effaa88 | 668 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
669 | leaq \sym(%rip),%rax |
670 | jmp error_entry | |
7effaa88 | 671 | CFI_ENDPROC |
1da177e4 LT |
672 | .endm |
673 | ||
674 | /* error code is on the stack already */ | |
675 | /* handle NMI like exceptions that can happen everywhere */ | |
676 | .macro paranoidentry sym | |
677 | SAVE_ALL | |
678 | cld | |
679 | movl $1,%ebx | |
680 | movl $MSR_GS_BASE,%ecx | |
681 | rdmsr | |
682 | testl %edx,%edx | |
683 | js 1f | |
684 | swapgs | |
685 | xorl %ebx,%ebx | |
686 | 1: movq %rsp,%rdi | |
687 | movq ORIG_RAX(%rsp),%rsi | |
688 | movq $-1,ORIG_RAX(%rsp) | |
689 | call \sym | |
6fefb0d1 | 690 | cli |
1da177e4 LT |
691 | .endm |
692 | ||
693 | /* | |
694 | * Exception entry point. This expects an error code/orig_rax on the stack | |
695 | * and the exception handler in %rax. | |
696 | */ | |
697 | ENTRY(error_entry) | |
7effaa88 | 698 | _frame RDI |
1da177e4 LT |
699 | /* rdi slot contains rax, oldrax contains error code */ |
700 | cld | |
701 | subq $14*8,%rsp | |
702 | CFI_ADJUST_CFA_OFFSET (14*8) | |
703 | movq %rsi,13*8(%rsp) | |
704 | CFI_REL_OFFSET rsi,RSI | |
705 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
706 | movq %rdx,12*8(%rsp) | |
707 | CFI_REL_OFFSET rdx,RDX | |
708 | movq %rcx,11*8(%rsp) | |
709 | CFI_REL_OFFSET rcx,RCX | |
710 | movq %rsi,10*8(%rsp) /* store rax */ | |
711 | CFI_REL_OFFSET rax,RAX | |
712 | movq %r8, 9*8(%rsp) | |
713 | CFI_REL_OFFSET r8,R8 | |
714 | movq %r9, 8*8(%rsp) | |
715 | CFI_REL_OFFSET r9,R9 | |
716 | movq %r10,7*8(%rsp) | |
717 | CFI_REL_OFFSET r10,R10 | |
718 | movq %r11,6*8(%rsp) | |
719 | CFI_REL_OFFSET r11,R11 | |
720 | movq %rbx,5*8(%rsp) | |
721 | CFI_REL_OFFSET rbx,RBX | |
722 | movq %rbp,4*8(%rsp) | |
723 | CFI_REL_OFFSET rbp,RBP | |
724 | movq %r12,3*8(%rsp) | |
725 | CFI_REL_OFFSET r12,R12 | |
726 | movq %r13,2*8(%rsp) | |
727 | CFI_REL_OFFSET r13,R13 | |
728 | movq %r14,1*8(%rsp) | |
729 | CFI_REL_OFFSET r14,R14 | |
730 | movq %r15,(%rsp) | |
731 | CFI_REL_OFFSET r15,R15 | |
732 | xorl %ebx,%ebx | |
733 | testl $3,CS(%rsp) | |
734 | je error_kernelspace | |
735 | error_swapgs: | |
736 | swapgs | |
737 | error_sti: | |
738 | movq %rdi,RDI(%rsp) | |
739 | movq %rsp,%rdi | |
740 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
741 | movq $-1,ORIG_RAX(%rsp) | |
742 | call *%rax | |
743 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
744 | error_exit: | |
745 | movl %ebx,%eax | |
746 | RESTORE_REST | |
747 | cli | |
748 | GET_THREAD_INFO(%rcx) | |
749 | testl %eax,%eax | |
750 | jne retint_kernel | |
751 | movl threadinfo_flags(%rcx),%edx | |
752 | movl $_TIF_WORK_MASK,%edi | |
753 | andl %edi,%edx | |
754 | jnz retint_careful | |
755 | swapgs | |
756 | RESTORE_ARGS 0,8,0 | |
757 | iretq | |
758 | CFI_ENDPROC | |
759 | ||
760 | error_kernelspace: | |
761 | incl %ebx | |
762 | /* There are two places in the kernel that can potentially fault with | |
763 | usergs. Handle them here. The exception handlers after | |
764 | iret run with kernel gs again, so don't set the user space flag. | |
765 | B stepping K8s sometimes report an truncated RIP for IRET | |
766 | exceptions returning to compat mode. Check for these here too. */ | |
767 | leaq iret_label(%rip),%rbp | |
768 | cmpq %rbp,RIP(%rsp) | |
769 | je error_swapgs | |
770 | movl %ebp,%ebp /* zero extend */ | |
771 | cmpq %rbp,RIP(%rsp) | |
772 | je error_swapgs | |
773 | cmpq $gs_change,RIP(%rsp) | |
774 | je error_swapgs | |
775 | jmp error_sti | |
776 | ||
777 | /* Reload gs selector with exception handling */ | |
778 | /* edi: new selector */ | |
779 | ENTRY(load_gs_index) | |
7effaa88 | 780 | CFI_STARTPROC |
1da177e4 | 781 | pushf |
7effaa88 | 782 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
783 | cli |
784 | swapgs | |
785 | gs_change: | |
786 | movl %edi,%gs | |
787 | 2: mfence /* workaround */ | |
788 | swapgs | |
789 | popf | |
7effaa88 | 790 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 791 | ret |
7effaa88 | 792 | CFI_ENDPROC |
1da177e4 LT |
793 | |
794 | .section __ex_table,"a" | |
795 | .align 8 | |
796 | .quad gs_change,bad_gs | |
797 | .previous | |
798 | .section .fixup,"ax" | |
799 | /* running with kernelgs */ | |
800 | bad_gs: | |
801 | swapgs /* switch back to user gs */ | |
802 | xorl %eax,%eax | |
803 | movl %eax,%gs | |
804 | jmp 2b | |
805 | .previous | |
806 | ||
807 | /* | |
808 | * Create a kernel thread. | |
809 | * | |
810 | * C extern interface: | |
811 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
812 | * | |
813 | * asm input arguments: | |
814 | * rdi: fn, rsi: arg, rdx: flags | |
815 | */ | |
816 | ENTRY(kernel_thread) | |
817 | CFI_STARTPROC | |
818 | FAKE_STACK_FRAME $child_rip | |
819 | SAVE_ALL | |
820 | ||
821 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
822 | movq %rdx,%rdi | |
823 | orq kernel_thread_flags(%rip),%rdi | |
824 | movq $-1, %rsi | |
825 | movq %rsp, %rdx | |
826 | ||
827 | xorl %r8d,%r8d | |
828 | xorl %r9d,%r9d | |
829 | ||
830 | # clone now | |
831 | call do_fork | |
832 | movq %rax,RAX(%rsp) | |
833 | xorl %edi,%edi | |
834 | ||
835 | /* | |
836 | * It isn't worth to check for reschedule here, | |
837 | * so internally to the x86_64 port you can rely on kernel_thread() | |
838 | * not to reschedule the child before returning, this avoids the need | |
839 | * of hacks for example to fork off the per-CPU idle tasks. | |
840 | * [Hopefully no generic code relies on the reschedule -AK] | |
841 | */ | |
842 | RESTORE_ALL | |
843 | UNFAKE_STACK_FRAME | |
844 | ret | |
845 | CFI_ENDPROC | |
846 | ||
847 | ||
848 | child_rip: | |
849 | /* | |
850 | * Here we are in the child and the registers are set as they were | |
851 | * at kernel_thread() invocation in the parent. | |
852 | */ | |
853 | movq %rdi, %rax | |
854 | movq %rsi, %rdi | |
855 | call *%rax | |
856 | # exit | |
3829ee6b | 857 | xorl %edi, %edi |
1da177e4 LT |
858 | call do_exit |
859 | ||
860 | /* | |
861 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
862 | * | |
863 | * C extern interface: | |
864 | * extern long execve(char *name, char **argv, char **envp) | |
865 | * | |
866 | * asm input arguments: | |
867 | * rdi: name, rsi: argv, rdx: envp | |
868 | * | |
869 | * We want to fallback into: | |
870 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
871 | * | |
872 | * do_sys_execve asm fallback arguments: | |
873 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
874 | */ | |
875 | ENTRY(execve) | |
876 | CFI_STARTPROC | |
877 | FAKE_STACK_FRAME $0 | |
878 | SAVE_ALL | |
879 | call sys_execve | |
880 | movq %rax, RAX(%rsp) | |
881 | RESTORE_REST | |
882 | testq %rax,%rax | |
883 | je int_ret_from_sys_call | |
884 | RESTORE_ARGS | |
885 | UNFAKE_STACK_FRAME | |
886 | ret | |
887 | CFI_ENDPROC | |
888 | ||
0f2fbdcb | 889 | KPROBE_ENTRY(page_fault) |
1da177e4 | 890 | errorentry do_page_fault |
0f2fbdcb | 891 | .previous .text |
1da177e4 LT |
892 | |
893 | ENTRY(coprocessor_error) | |
894 | zeroentry do_coprocessor_error | |
895 | ||
896 | ENTRY(simd_coprocessor_error) | |
897 | zeroentry do_simd_coprocessor_error | |
898 | ||
899 | ENTRY(device_not_available) | |
900 | zeroentry math_state_restore | |
901 | ||
902 | /* runs on exception stack */ | |
0f2fbdcb | 903 | KPROBE_ENTRY(debug) |
7effaa88 | 904 | INTR_FRAME |
1da177e4 LT |
905 | pushq $0 |
906 | CFI_ADJUST_CFA_OFFSET 8 | |
907 | paranoidentry do_debug | |
1da177e4 LT |
908 | jmp paranoid_exit |
909 | CFI_ENDPROC | |
0f2fbdcb | 910 | .previous .text |
1da177e4 LT |
911 | |
912 | /* runs on exception stack */ | |
913 | ENTRY(nmi) | |
7effaa88 | 914 | INTR_FRAME |
1da177e4 | 915 | pushq $-1 |
7effaa88 | 916 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 917 | paranoidentry do_nmi |
6fefb0d1 AK |
918 | /* |
919 | * "Paranoid" exit path from exception stack. | |
920 | * Paranoid because this is used by NMIs and cannot take | |
921 | * any kernel state for granted. | |
922 | * We don't do kernel preemption checks here, because only | |
923 | * NMI should be common and it does not enable IRQs and | |
924 | * cannot get reschedule ticks. | |
925 | */ | |
1da177e4 LT |
926 | /* ebx: no swapgs flag */ |
927 | paranoid_exit: | |
928 | testl %ebx,%ebx /* swapgs needed? */ | |
929 | jnz paranoid_restore | |
6fefb0d1 AK |
930 | testl $3,CS(%rsp) |
931 | jnz paranoid_userspace | |
1da177e4 | 932 | paranoid_swapgs: |
1da177e4 LT |
933 | swapgs |
934 | paranoid_restore: | |
935 | RESTORE_ALL 8 | |
936 | iretq | |
937 | paranoid_userspace: | |
1da177e4 | 938 | GET_THREAD_INFO(%rcx) |
6fefb0d1 AK |
939 | movl threadinfo_flags(%rcx),%ebx |
940 | andl $_TIF_WORK_MASK,%ebx | |
11b854b2 | 941 | jz paranoid_swapgs |
6fefb0d1 AK |
942 | movq %rsp,%rdi /* &pt_regs */ |
943 | call sync_regs | |
944 | movq %rax,%rsp /* switch stack for scheduling */ | |
945 | testl $_TIF_NEED_RESCHED,%ebx | |
946 | jnz paranoid_schedule | |
947 | movl %ebx,%edx /* arg3: thread flags */ | |
1da177e4 | 948 | sti |
6fefb0d1 AK |
949 | xorl %esi,%esi /* arg2: oldset */ |
950 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1da177e4 | 951 | call do_notify_resume |
6fefb0d1 AK |
952 | cli |
953 | jmp paranoid_userspace | |
954 | paranoid_schedule: | |
11b854b2 AK |
955 | sti |
956 | call schedule | |
6fefb0d1 AK |
957 | cli |
958 | jmp paranoid_userspace | |
1da177e4 | 959 | CFI_ENDPROC |
6fefb0d1 | 960 | |
0f2fbdcb | 961 | KPROBE_ENTRY(int3) |
1da177e4 | 962 | zeroentry do_int3 |
0f2fbdcb | 963 | .previous .text |
1da177e4 LT |
964 | |
965 | ENTRY(overflow) | |
966 | zeroentry do_overflow | |
967 | ||
968 | ENTRY(bounds) | |
969 | zeroentry do_bounds | |
970 | ||
971 | ENTRY(invalid_op) | |
972 | zeroentry do_invalid_op | |
973 | ||
974 | ENTRY(coprocessor_segment_overrun) | |
975 | zeroentry do_coprocessor_segment_overrun | |
976 | ||
977 | ENTRY(reserved) | |
978 | zeroentry do_reserved | |
979 | ||
980 | /* runs on exception stack */ | |
981 | ENTRY(double_fault) | |
7effaa88 | 982 | XCPT_FRAME |
1da177e4 | 983 | paranoidentry do_double_fault |
1da177e4 LT |
984 | jmp paranoid_exit |
985 | CFI_ENDPROC | |
986 | ||
987 | ENTRY(invalid_TSS) | |
988 | errorentry do_invalid_TSS | |
989 | ||
990 | ENTRY(segment_not_present) | |
991 | errorentry do_segment_not_present | |
992 | ||
993 | /* runs on exception stack */ | |
994 | ENTRY(stack_segment) | |
7effaa88 | 995 | XCPT_FRAME |
1da177e4 | 996 | paranoidentry do_stack_segment |
1da177e4 LT |
997 | jmp paranoid_exit |
998 | CFI_ENDPROC | |
999 | ||
0f2fbdcb | 1000 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1001 | errorentry do_general_protection |
0f2fbdcb | 1002 | .previous .text |
1da177e4 LT |
1003 | |
1004 | ENTRY(alignment_check) | |
1005 | errorentry do_alignment_check | |
1006 | ||
1007 | ENTRY(divide_error) | |
1008 | zeroentry do_divide_error | |
1009 | ||
1010 | ENTRY(spurious_interrupt_bug) | |
1011 | zeroentry do_spurious_interrupt_bug | |
1012 | ||
1013 | #ifdef CONFIG_X86_MCE | |
1014 | /* runs on exception stack */ | |
1015 | ENTRY(machine_check) | |
7effaa88 | 1016 | INTR_FRAME |
1da177e4 LT |
1017 | pushq $0 |
1018 | CFI_ADJUST_CFA_OFFSET 8 | |
1019 | paranoidentry do_machine_check | |
1020 | jmp paranoid_exit | |
1021 | CFI_ENDPROC | |
1022 | #endif | |
1023 | ||
1024 | ENTRY(call_debug) | |
1025 | zeroentry do_call_debug | |
1026 | ||
ed6b676c | 1027 | ENTRY(call_softirq) |
7effaa88 | 1028 | CFI_STARTPROC |
ed6b676c AK |
1029 | movq %gs:pda_irqstackptr,%rax |
1030 | pushq %r15 | |
7effaa88 | 1031 | CFI_ADJUST_CFA_OFFSET 8 |
ed6b676c | 1032 | movq %rsp,%r15 |
7effaa88 | 1033 | CFI_DEF_CFA_REGISTER r15 |
ed6b676c AK |
1034 | incl %gs:pda_irqcount |
1035 | cmove %rax,%rsp | |
1036 | call __do_softirq | |
1037 | movq %r15,%rsp | |
7effaa88 | 1038 | CFI_DEF_CFA_REGISTER rsp |
ed6b676c AK |
1039 | decl %gs:pda_irqcount |
1040 | popq %r15 | |
7effaa88 | 1041 | CFI_ADJUST_CFA_OFFSET -8 |
ed6b676c | 1042 | ret |
7effaa88 | 1043 | CFI_ENDPROC |