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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> | |
5f8efbb9 | 44 | #include <asm/page.h> |
1da177e4 LT |
45 | |
46 | .code64 | |
47 | ||
dc37db4d | 48 | #ifndef CONFIG_PREEMPT |
1da177e4 LT |
49 | #define retint_kernel retint_restore_args |
50 | #endif | |
51 | ||
52 | /* | |
53 | * C code is not supposed to know about undefined top of stack. Every time | |
54 | * a C function with an pt_regs argument is called from the SYSCALL based | |
55 | * fast path FIXUP_TOP_OF_STACK is needed. | |
56 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs | |
57 | * manipulation. | |
58 | */ | |
59 | ||
60 | /* %rsp:at FRAMEEND */ | |
61 | .macro FIXUP_TOP_OF_STACK tmp | |
62 | movq %gs:pda_oldrsp,\tmp | |
63 | movq \tmp,RSP(%rsp) | |
64 | movq $__USER_DS,SS(%rsp) | |
65 | movq $__USER_CS,CS(%rsp) | |
66 | movq $-1,RCX(%rsp) | |
67 | movq R11(%rsp),\tmp /* get eflags */ | |
68 | movq \tmp,EFLAGS(%rsp) | |
69 | .endm | |
70 | ||
71 | .macro RESTORE_TOP_OF_STACK tmp,offset=0 | |
72 | movq RSP-\offset(%rsp),\tmp | |
73 | movq \tmp,%gs:pda_oldrsp | |
74 | movq EFLAGS-\offset(%rsp),\tmp | |
75 | movq \tmp,R11-\offset(%rsp) | |
76 | .endm | |
77 | ||
78 | .macro FAKE_STACK_FRAME child_rip | |
79 | /* push in order ss, rsp, eflags, cs, rip */ | |
3829ee6b | 80 | xorl %eax, %eax |
1da177e4 LT |
81 | pushq %rax /* ss */ |
82 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 83 | /*CFI_REL_OFFSET ss,0*/ |
1da177e4 LT |
84 | pushq %rax /* rsp */ |
85 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 86 | CFI_REL_OFFSET rsp,0 |
1da177e4 LT |
87 | pushq $(1<<9) /* eflags - interrupts on */ |
88 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 89 | /*CFI_REL_OFFSET rflags,0*/ |
1da177e4 LT |
90 | pushq $__KERNEL_CS /* cs */ |
91 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 92 | /*CFI_REL_OFFSET cs,0*/ |
1da177e4 LT |
93 | pushq \child_rip /* rip */ |
94 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 95 | CFI_REL_OFFSET rip,0 |
1da177e4 LT |
96 | pushq %rax /* orig rax */ |
97 | CFI_ADJUST_CFA_OFFSET 8 | |
98 | .endm | |
99 | ||
100 | .macro UNFAKE_STACK_FRAME | |
101 | addq $8*6, %rsp | |
102 | CFI_ADJUST_CFA_OFFSET -(6*8) | |
103 | .endm | |
104 | ||
7effaa88 JB |
105 | .macro CFI_DEFAULT_STACK start=1 |
106 | .if \start | |
107 | CFI_STARTPROC simple | |
108 | CFI_DEF_CFA rsp,SS+8 | |
109 | .else | |
110 | CFI_DEF_CFA_OFFSET SS+8 | |
111 | .endif | |
112 | CFI_REL_OFFSET r15,R15 | |
113 | CFI_REL_OFFSET r14,R14 | |
114 | CFI_REL_OFFSET r13,R13 | |
115 | CFI_REL_OFFSET r12,R12 | |
116 | CFI_REL_OFFSET rbp,RBP | |
117 | CFI_REL_OFFSET rbx,RBX | |
118 | CFI_REL_OFFSET r11,R11 | |
119 | CFI_REL_OFFSET r10,R10 | |
120 | CFI_REL_OFFSET r9,R9 | |
121 | CFI_REL_OFFSET r8,R8 | |
122 | CFI_REL_OFFSET rax,RAX | |
123 | CFI_REL_OFFSET rcx,RCX | |
124 | CFI_REL_OFFSET rdx,RDX | |
125 | CFI_REL_OFFSET rsi,RSI | |
126 | CFI_REL_OFFSET rdi,RDI | |
127 | CFI_REL_OFFSET rip,RIP | |
128 | /*CFI_REL_OFFSET cs,CS*/ | |
129 | /*CFI_REL_OFFSET rflags,EFLAGS*/ | |
130 | CFI_REL_OFFSET rsp,RSP | |
131 | /*CFI_REL_OFFSET ss,SS*/ | |
1da177e4 LT |
132 | .endm |
133 | /* | |
134 | * A newly forked process directly context switches into this. | |
135 | */ | |
136 | /* rdi: prev */ | |
137 | ENTRY(ret_from_fork) | |
1da177e4 LT |
138 | CFI_DEFAULT_STACK |
139 | call schedule_tail | |
140 | GET_THREAD_INFO(%rcx) | |
141 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx) | |
142 | jnz rff_trace | |
143 | rff_action: | |
144 | RESTORE_REST | |
145 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? | |
146 | je int_ret_from_sys_call | |
147 | testl $_TIF_IA32,threadinfo_flags(%rcx) | |
148 | jnz int_ret_from_sys_call | |
149 | RESTORE_TOP_OF_STACK %rdi,ARGOFFSET | |
150 | jmp ret_from_sys_call | |
151 | rff_trace: | |
152 | movq %rsp,%rdi | |
153 | call syscall_trace_leave | |
154 | GET_THREAD_INFO(%rcx) | |
155 | jmp rff_action | |
156 | CFI_ENDPROC | |
157 | ||
158 | /* | |
159 | * System call entry. Upto 6 arguments in registers are supported. | |
160 | * | |
161 | * SYSCALL does not save anything on the stack and does not change the | |
162 | * stack pointer. | |
163 | */ | |
164 | ||
165 | /* | |
166 | * Register setup: | |
167 | * rax system call number | |
168 | * rdi arg0 | |
169 | * rcx return address for syscall/sysret, C arg3 | |
170 | * rsi arg1 | |
171 | * rdx arg2 | |
172 | * r10 arg3 (--> moved to rcx for C) | |
173 | * r8 arg4 | |
174 | * r9 arg5 | |
175 | * r11 eflags for syscall/sysret, temporary for C | |
176 | * r12-r15,rbp,rbx saved by C code, not touched. | |
177 | * | |
178 | * Interrupts are off on entry. | |
179 | * Only called from user space. | |
180 | * | |
181 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
182 | * and report it properly in ps. Unfortunately we haven't. | |
7bf36bbc AK |
183 | * |
184 | * When user can change the frames always force IRET. That is because | |
185 | * it deals with uncanonical addresses better. SYSRET has trouble | |
186 | * with them due to bugs in both AMD and Intel CPUs. | |
1da177e4 LT |
187 | */ |
188 | ||
189 | ENTRY(system_call) | |
7effaa88 JB |
190 | CFI_STARTPROC simple |
191 | CFI_DEF_CFA rsp,0 | |
192 | CFI_REGISTER rip,rcx | |
193 | /*CFI_REGISTER rflags,r11*/ | |
1da177e4 LT |
194 | swapgs |
195 | movq %rsp,%gs:pda_oldrsp | |
196 | movq %gs:pda_kernelstack,%rsp | |
197 | sti | |
198 | SAVE_ARGS 8,1 | |
199 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) | |
7effaa88 JB |
200 | movq %rcx,RIP-ARGOFFSET(%rsp) |
201 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 LT |
202 | GET_THREAD_INFO(%rcx) |
203 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx) | |
7effaa88 | 204 | CFI_REMEMBER_STATE |
1da177e4 LT |
205 | jnz tracesys |
206 | cmpq $__NR_syscall_max,%rax | |
207 | ja badsys | |
208 | movq %r10,%rcx | |
209 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
210 | movq %rax,RAX-ARGOFFSET(%rsp) | |
211 | /* | |
212 | * Syscall return path ending with SYSRET (fast path) | |
213 | * Has incomplete stack frame and undefined top of stack. | |
214 | */ | |
215 | .globl ret_from_sys_call | |
216 | ret_from_sys_call: | |
11b854b2 | 217 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 LT |
218 | /* edi: flagmask */ |
219 | sysret_check: | |
220 | GET_THREAD_INFO(%rcx) | |
221 | cli | |
222 | movl threadinfo_flags(%rcx),%edx | |
223 | andl %edi,%edx | |
7effaa88 | 224 | CFI_REMEMBER_STATE |
1da177e4 LT |
225 | jnz sysret_careful |
226 | movq RIP-ARGOFFSET(%rsp),%rcx | |
7effaa88 | 227 | CFI_REGISTER rip,rcx |
1da177e4 | 228 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 229 | /*CFI_REGISTER rflags,r11*/ |
1da177e4 LT |
230 | movq %gs:pda_oldrsp,%rsp |
231 | swapgs | |
232 | sysretq | |
233 | ||
234 | /* Handle reschedules */ | |
235 | /* edx: work, edi: workmask */ | |
236 | sysret_careful: | |
7effaa88 | 237 | CFI_RESTORE_STATE |
1da177e4 LT |
238 | bt $TIF_NEED_RESCHED,%edx |
239 | jnc sysret_signal | |
240 | sti | |
241 | pushq %rdi | |
7effaa88 | 242 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
243 | call schedule |
244 | popq %rdi | |
7effaa88 | 245 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
246 | jmp sysret_check |
247 | ||
248 | /* Handle a signal */ | |
249 | sysret_signal: | |
250 | sti | |
10ffdbb8 AK |
251 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
252 | jz 1f | |
253 | ||
254 | /* Really a signal */ | |
255 | /* edx: work flags (arg3) */ | |
1da177e4 LT |
256 | leaq do_notify_resume(%rip),%rax |
257 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
258 | xorl %esi,%esi # oldset -> arg2 | |
259 | call ptregscall_common | |
10ffdbb8 | 260 | 1: movl $_TIF_NEED_RESCHED,%edi |
7bf36bbc AK |
261 | /* Use IRET because user could have changed frame. This |
262 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ | |
263 | cli | |
264 | jmp int_with_check | |
1da177e4 | 265 | |
7effaa88 JB |
266 | badsys: |
267 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
268 | jmp ret_from_sys_call | |
269 | ||
1da177e4 LT |
270 | /* Do syscall tracing */ |
271 | tracesys: | |
7effaa88 | 272 | CFI_RESTORE_STATE |
1da177e4 LT |
273 | SAVE_REST |
274 | movq $-ENOSYS,RAX(%rsp) | |
275 | FIXUP_TOP_OF_STACK %rdi | |
276 | movq %rsp,%rdi | |
277 | call syscall_trace_enter | |
278 | LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */ | |
279 | RESTORE_REST | |
280 | cmpq $__NR_syscall_max,%rax | |
281 | ja 1f | |
282 | movq %r10,%rcx /* fixup for C */ | |
283 | call *sys_call_table(,%rax,8) | |
284 | movq %rax,RAX-ARGOFFSET(%rsp) | |
285 | 1: SAVE_REST | |
286 | movq %rsp,%rdi | |
287 | call syscall_trace_leave | |
288 | RESTORE_TOP_OF_STACK %rbx | |
289 | RESTORE_REST | |
7bf36bbc AK |
290 | /* Use IRET because user could have changed frame */ |
291 | jmp int_ret_from_sys_call | |
7effaa88 | 292 | CFI_ENDPROC |
1da177e4 | 293 | |
1da177e4 LT |
294 | /* |
295 | * Syscall return path ending with IRET. | |
296 | * Has correct top of stack, but partial stack frame. | |
297 | */ | |
7effaa88 JB |
298 | ENTRY(int_ret_from_sys_call) |
299 | CFI_STARTPROC simple | |
300 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET | |
301 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
302 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
303 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
304 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
305 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
306 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
307 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
308 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
309 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
310 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
311 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
312 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
313 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
314 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 LT |
315 | cli |
316 | testl $3,CS-ARGOFFSET(%rsp) | |
317 | je retint_restore_args | |
318 | movl $_TIF_ALLWORK_MASK,%edi | |
319 | /* edi: mask to check */ | |
320 | int_with_check: | |
321 | GET_THREAD_INFO(%rcx) | |
322 | movl threadinfo_flags(%rcx),%edx | |
323 | andl %edi,%edx | |
324 | jnz int_careful | |
bf2fcc6f | 325 | andl $~TS_COMPAT,threadinfo_status(%rcx) |
1da177e4 LT |
326 | jmp retint_swapgs |
327 | ||
328 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
329 | /* First do a reschedule test. */ | |
330 | /* edx: work, edi: workmask */ | |
331 | int_careful: | |
332 | bt $TIF_NEED_RESCHED,%edx | |
333 | jnc int_very_careful | |
334 | sti | |
335 | pushq %rdi | |
7effaa88 | 336 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
337 | call schedule |
338 | popq %rdi | |
7effaa88 | 339 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 340 | cli |
1da177e4 LT |
341 | jmp int_with_check |
342 | ||
343 | /* handle signals and tracing -- both require a full stack frame */ | |
344 | int_very_careful: | |
345 | sti | |
346 | SAVE_REST | |
347 | /* Check for syscall exit trace */ | |
348 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
349 | jz int_signal | |
350 | pushq %rdi | |
7effaa88 | 351 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
352 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
353 | call syscall_trace_leave | |
354 | popq %rdi | |
7effaa88 | 355 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 356 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 357 | cli |
1da177e4 LT |
358 | jmp int_restore_rest |
359 | ||
360 | int_signal: | |
361 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
362 | jz 1f | |
363 | movq %rsp,%rdi # &ptregs -> arg1 | |
364 | xorl %esi,%esi # oldset -> arg2 | |
365 | call do_notify_resume | |
366 | 1: movl $_TIF_NEED_RESCHED,%edi | |
367 | int_restore_rest: | |
368 | RESTORE_REST | |
be9e6870 | 369 | cli |
1da177e4 LT |
370 | jmp int_with_check |
371 | CFI_ENDPROC | |
372 | ||
373 | /* | |
374 | * Certain special system calls that need to save a complete full stack frame. | |
375 | */ | |
376 | ||
377 | .macro PTREGSCALL label,func,arg | |
378 | .globl \label | |
379 | \label: | |
380 | leaq \func(%rip),%rax | |
381 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
382 | jmp ptregscall_common | |
383 | .endm | |
384 | ||
7effaa88 JB |
385 | CFI_STARTPROC |
386 | ||
1da177e4 LT |
387 | PTREGSCALL stub_clone, sys_clone, %r8 |
388 | PTREGSCALL stub_fork, sys_fork, %rdi | |
389 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
390 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
391 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
392 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
393 | ||
394 | ENTRY(ptregscall_common) | |
1da177e4 | 395 | popq %r11 |
7effaa88 JB |
396 | CFI_ADJUST_CFA_OFFSET -8 |
397 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
398 | SAVE_REST |
399 | movq %r11, %r15 | |
7effaa88 | 400 | CFI_REGISTER rip, r15 |
1da177e4 LT |
401 | FIXUP_TOP_OF_STACK %r11 |
402 | call *%rax | |
403 | RESTORE_TOP_OF_STACK %r11 | |
404 | movq %r15, %r11 | |
7effaa88 | 405 | CFI_REGISTER rip, r11 |
1da177e4 LT |
406 | RESTORE_REST |
407 | pushq %r11 | |
7effaa88 JB |
408 | CFI_ADJUST_CFA_OFFSET 8 |
409 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
410 | ret |
411 | CFI_ENDPROC | |
412 | ||
413 | ENTRY(stub_execve) | |
414 | CFI_STARTPROC | |
415 | popq %r11 | |
7effaa88 JB |
416 | CFI_ADJUST_CFA_OFFSET -8 |
417 | CFI_REGISTER rip, r11 | |
1da177e4 | 418 | SAVE_REST |
1da177e4 LT |
419 | FIXUP_TOP_OF_STACK %r11 |
420 | call sys_execve | |
1da177e4 | 421 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
422 | movq %rax,RAX(%rsp) |
423 | RESTORE_REST | |
424 | jmp int_ret_from_sys_call | |
425 | CFI_ENDPROC | |
426 | ||
427 | /* | |
428 | * sigreturn is special because it needs to restore all registers on return. | |
429 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
430 | */ | |
431 | ENTRY(stub_rt_sigreturn) | |
432 | CFI_STARTPROC | |
7effaa88 JB |
433 | addq $8, %rsp |
434 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
435 | SAVE_REST |
436 | movq %rsp,%rdi | |
437 | FIXUP_TOP_OF_STACK %r11 | |
438 | call sys_rt_sigreturn | |
439 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
440 | RESTORE_REST | |
441 | jmp int_ret_from_sys_call | |
442 | CFI_ENDPROC | |
443 | ||
7effaa88 JB |
444 | /* |
445 | * initial frame state for interrupts and exceptions | |
446 | */ | |
447 | .macro _frame ref | |
448 | CFI_STARTPROC simple | |
449 | CFI_DEF_CFA rsp,SS+8-\ref | |
450 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
451 | CFI_REL_OFFSET rsp,RSP-\ref | |
452 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
453 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
454 | CFI_REL_OFFSET rip,RIP-\ref | |
455 | .endm | |
456 | ||
457 | /* initial frame state for interrupts (and exceptions without error code) */ | |
458 | #define INTR_FRAME _frame RIP | |
459 | /* initial frame state for exceptions with error code (and interrupts with | |
460 | vector already pushed) */ | |
461 | #define XCPT_FRAME _frame ORIG_RAX | |
462 | ||
1da177e4 LT |
463 | /* |
464 | * Interrupt entry/exit. | |
465 | * | |
466 | * Interrupt entry points save only callee clobbered registers in fast path. | |
467 | * | |
468 | * Entry runs with interrupts off. | |
469 | */ | |
470 | ||
471 | /* 0(%rsp): interrupt number */ | |
472 | .macro interrupt func | |
1da177e4 LT |
473 | cld |
474 | #ifdef CONFIG_DEBUG_INFO | |
475 | SAVE_ALL | |
476 | movq %rsp,%rdi | |
477 | /* | |
478 | * Setup a stack frame pointer. This allows gdb to trace | |
479 | * back to the original stack. | |
480 | */ | |
481 | movq %rsp,%rbp | |
482 | CFI_DEF_CFA_REGISTER rbp | |
483 | #else | |
484 | SAVE_ARGS | |
485 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
486 | #endif | |
487 | testl $3,CS(%rdi) | |
488 | je 1f | |
489 | swapgs | |
3829ee6b | 490 | 1: incl %gs:pda_irqcount # RED-PEN should check preempt count |
1da177e4 | 491 | movq %gs:pda_irqstackptr,%rax |
7effaa88 | 492 | cmoveq %rax,%rsp /*todo This needs CFI annotation! */ |
1da177e4 | 493 | pushq %rdi # save old stack |
91522a96 | 494 | #ifndef CONFIG_DEBUG_INFO |
7effaa88 | 495 | CFI_ADJUST_CFA_OFFSET 8 |
91522a96 | 496 | #endif |
1da177e4 LT |
497 | call \func |
498 | .endm | |
499 | ||
500 | ENTRY(common_interrupt) | |
7effaa88 | 501 | XCPT_FRAME |
1da177e4 LT |
502 | interrupt do_IRQ |
503 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 504 | ret_from_intr: |
1da177e4 | 505 | popq %rdi |
91522a96 | 506 | #ifndef CONFIG_DEBUG_INFO |
7effaa88 | 507 | CFI_ADJUST_CFA_OFFSET -8 |
91522a96 | 508 | #endif |
1da177e4 | 509 | cli |
3829ee6b | 510 | decl %gs:pda_irqcount |
1da177e4 LT |
511 | #ifdef CONFIG_DEBUG_INFO |
512 | movq RBP(%rdi),%rbp | |
7effaa88 | 513 | CFI_DEF_CFA_REGISTER rsp |
1da177e4 | 514 | #endif |
7effaa88 JB |
515 | leaq ARGOFFSET(%rdi),%rsp /*todo This needs CFI annotation! */ |
516 | exit_intr: | |
1da177e4 LT |
517 | GET_THREAD_INFO(%rcx) |
518 | testl $3,CS-ARGOFFSET(%rsp) | |
519 | je retint_kernel | |
520 | ||
521 | /* Interrupt came from user space */ | |
522 | /* | |
523 | * Has a correct top of stack, but a partial stack frame | |
524 | * %rcx: thread info. Interrupts off. | |
525 | */ | |
526 | retint_with_reschedule: | |
527 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 528 | retint_check: |
1da177e4 LT |
529 | movl threadinfo_flags(%rcx),%edx |
530 | andl %edi,%edx | |
7effaa88 | 531 | CFI_REMEMBER_STATE |
1da177e4 LT |
532 | jnz retint_careful |
533 | retint_swapgs: | |
1da177e4 LT |
534 | swapgs |
535 | retint_restore_args: | |
536 | cli | |
537 | RESTORE_ARGS 0,8,0 | |
538 | iret_label: | |
539 | iretq | |
540 | ||
541 | .section __ex_table,"a" | |
542 | .quad iret_label,bad_iret | |
543 | .previous | |
544 | .section .fixup,"ax" | |
545 | /* force a signal here? this matches i386 behaviour */ | |
546 | /* running with kernel gs */ | |
547 | bad_iret: | |
3076a492 | 548 | movq $11,%rdi /* SIGSEGV */ |
2391c4b5 | 549 | sti |
1da177e4 LT |
550 | jmp do_exit |
551 | .previous | |
552 | ||
7effaa88 | 553 | /* edi: workmask, edx: work */ |
1da177e4 | 554 | retint_careful: |
7effaa88 | 555 | CFI_RESTORE_STATE |
1da177e4 LT |
556 | bt $TIF_NEED_RESCHED,%edx |
557 | jnc retint_signal | |
558 | sti | |
559 | pushq %rdi | |
7effaa88 | 560 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
561 | call schedule |
562 | popq %rdi | |
7effaa88 | 563 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
564 | GET_THREAD_INFO(%rcx) |
565 | cli | |
566 | jmp retint_check | |
567 | ||
568 | retint_signal: | |
10ffdbb8 AK |
569 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
570 | jz retint_swapgs | |
1da177e4 LT |
571 | sti |
572 | SAVE_REST | |
573 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 574 | xorl %esi,%esi # oldset |
1da177e4 LT |
575 | movq %rsp,%rdi # &pt_regs |
576 | call do_notify_resume | |
577 | RESTORE_REST | |
578 | cli | |
10ffdbb8 | 579 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 580 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
581 | jmp retint_check |
582 | ||
583 | #ifdef CONFIG_PREEMPT | |
584 | /* Returning to kernel space. Check if we need preemption */ | |
585 | /* rcx: threadinfo. interrupts off. */ | |
586 | .p2align | |
587 | retint_kernel: | |
588 | cmpl $0,threadinfo_preempt_count(%rcx) | |
589 | jnz retint_restore_args | |
590 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
591 | jnc retint_restore_args | |
592 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
593 | jnc retint_restore_args | |
594 | call preempt_schedule_irq | |
595 | jmp exit_intr | |
596 | #endif | |
597 | CFI_ENDPROC | |
598 | ||
599 | /* | |
600 | * APIC interrupts. | |
601 | */ | |
602 | .macro apicinterrupt num,func | |
7effaa88 | 603 | INTR_FRAME |
1da177e4 | 604 | pushq $\num-256 |
7effaa88 | 605 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
606 | interrupt \func |
607 | jmp ret_from_intr | |
608 | CFI_ENDPROC | |
609 | .endm | |
610 | ||
611 | ENTRY(thermal_interrupt) | |
612 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
613 | ||
89b831ef JS |
614 | ENTRY(threshold_interrupt) |
615 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
616 | ||
1da177e4 LT |
617 | #ifdef CONFIG_SMP |
618 | ENTRY(reschedule_interrupt) | |
619 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
620 | ||
e5bc8b6b AK |
621 | .macro INVALIDATE_ENTRY num |
622 | ENTRY(invalidate_interrupt\num) | |
623 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
624 | .endm | |
625 | ||
626 | INVALIDATE_ENTRY 0 | |
627 | INVALIDATE_ENTRY 1 | |
628 | INVALIDATE_ENTRY 2 | |
629 | INVALIDATE_ENTRY 3 | |
630 | INVALIDATE_ENTRY 4 | |
631 | INVALIDATE_ENTRY 5 | |
632 | INVALIDATE_ENTRY 6 | |
633 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
634 | |
635 | ENTRY(call_function_interrupt) | |
636 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
637 | #endif | |
638 | ||
639 | #ifdef CONFIG_X86_LOCAL_APIC | |
640 | ENTRY(apic_timer_interrupt) | |
641 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
642 | ||
643 | ENTRY(error_interrupt) | |
644 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
645 | ||
646 | ENTRY(spurious_interrupt) | |
647 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
648 | #endif | |
649 | ||
650 | /* | |
651 | * Exception entry points. | |
652 | */ | |
653 | .macro zeroentry sym | |
7effaa88 | 654 | INTR_FRAME |
1da177e4 | 655 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 656 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 657 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 658 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
659 | leaq \sym(%rip),%rax |
660 | jmp error_entry | |
7effaa88 | 661 | CFI_ENDPROC |
1da177e4 LT |
662 | .endm |
663 | ||
664 | .macro errorentry sym | |
7effaa88 | 665 | XCPT_FRAME |
1da177e4 | 666 | pushq %rax |
7effaa88 | 667 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
668 | leaq \sym(%rip),%rax |
669 | jmp error_entry | |
7effaa88 | 670 | CFI_ENDPROC |
1da177e4 LT |
671 | .endm |
672 | ||
673 | /* error code is on the stack already */ | |
674 | /* handle NMI like exceptions that can happen everywhere */ | |
b556b35e | 675 | .macro paranoidentry sym, ist=0 |
1da177e4 LT |
676 | SAVE_ALL |
677 | cld | |
678 | movl $1,%ebx | |
679 | movl $MSR_GS_BASE,%ecx | |
680 | rdmsr | |
681 | testl %edx,%edx | |
682 | js 1f | |
683 | swapgs | |
684 | xorl %ebx,%ebx | |
b556b35e JB |
685 | 1: |
686 | .if \ist | |
687 | movq %gs:pda_data_offset, %rbp | |
688 | .endif | |
689 | movq %rsp,%rdi | |
1da177e4 LT |
690 | movq ORIG_RAX(%rsp),%rsi |
691 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 692 | .if \ist |
5f8efbb9 | 693 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 694 | .endif |
1da177e4 | 695 | call \sym |
b556b35e | 696 | .if \ist |
5f8efbb9 | 697 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 698 | .endif |
6fefb0d1 | 699 | cli |
1da177e4 LT |
700 | .endm |
701 | ||
702 | /* | |
703 | * Exception entry point. This expects an error code/orig_rax on the stack | |
704 | * and the exception handler in %rax. | |
705 | */ | |
706 | ENTRY(error_entry) | |
7effaa88 | 707 | _frame RDI |
1da177e4 LT |
708 | /* rdi slot contains rax, oldrax contains error code */ |
709 | cld | |
710 | subq $14*8,%rsp | |
711 | CFI_ADJUST_CFA_OFFSET (14*8) | |
712 | movq %rsi,13*8(%rsp) | |
713 | CFI_REL_OFFSET rsi,RSI | |
714 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
715 | movq %rdx,12*8(%rsp) | |
716 | CFI_REL_OFFSET rdx,RDX | |
717 | movq %rcx,11*8(%rsp) | |
718 | CFI_REL_OFFSET rcx,RCX | |
719 | movq %rsi,10*8(%rsp) /* store rax */ | |
720 | CFI_REL_OFFSET rax,RAX | |
721 | movq %r8, 9*8(%rsp) | |
722 | CFI_REL_OFFSET r8,R8 | |
723 | movq %r9, 8*8(%rsp) | |
724 | CFI_REL_OFFSET r9,R9 | |
725 | movq %r10,7*8(%rsp) | |
726 | CFI_REL_OFFSET r10,R10 | |
727 | movq %r11,6*8(%rsp) | |
728 | CFI_REL_OFFSET r11,R11 | |
729 | movq %rbx,5*8(%rsp) | |
730 | CFI_REL_OFFSET rbx,RBX | |
731 | movq %rbp,4*8(%rsp) | |
732 | CFI_REL_OFFSET rbp,RBP | |
733 | movq %r12,3*8(%rsp) | |
734 | CFI_REL_OFFSET r12,R12 | |
735 | movq %r13,2*8(%rsp) | |
736 | CFI_REL_OFFSET r13,R13 | |
737 | movq %r14,1*8(%rsp) | |
738 | CFI_REL_OFFSET r14,R14 | |
739 | movq %r15,(%rsp) | |
740 | CFI_REL_OFFSET r15,R15 | |
741 | xorl %ebx,%ebx | |
742 | testl $3,CS(%rsp) | |
743 | je error_kernelspace | |
744 | error_swapgs: | |
745 | swapgs | |
746 | error_sti: | |
747 | movq %rdi,RDI(%rsp) | |
748 | movq %rsp,%rdi | |
749 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
750 | movq $-1,ORIG_RAX(%rsp) | |
751 | call *%rax | |
752 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
753 | error_exit: | |
754 | movl %ebx,%eax | |
755 | RESTORE_REST | |
756 | cli | |
757 | GET_THREAD_INFO(%rcx) | |
758 | testl %eax,%eax | |
759 | jne retint_kernel | |
760 | movl threadinfo_flags(%rcx),%edx | |
761 | movl $_TIF_WORK_MASK,%edi | |
762 | andl %edi,%edx | |
763 | jnz retint_careful | |
764 | swapgs | |
765 | RESTORE_ARGS 0,8,0 | |
505cc4e1 | 766 | jmp iret_label |
1da177e4 LT |
767 | CFI_ENDPROC |
768 | ||
769 | error_kernelspace: | |
770 | incl %ebx | |
771 | /* There are two places in the kernel that can potentially fault with | |
772 | usergs. Handle them here. The exception handlers after | |
773 | iret run with kernel gs again, so don't set the user space flag. | |
774 | B stepping K8s sometimes report an truncated RIP for IRET | |
775 | exceptions returning to compat mode. Check for these here too. */ | |
776 | leaq iret_label(%rip),%rbp | |
777 | cmpq %rbp,RIP(%rsp) | |
778 | je error_swapgs | |
779 | movl %ebp,%ebp /* zero extend */ | |
780 | cmpq %rbp,RIP(%rsp) | |
781 | je error_swapgs | |
782 | cmpq $gs_change,RIP(%rsp) | |
783 | je error_swapgs | |
784 | jmp error_sti | |
785 | ||
786 | /* Reload gs selector with exception handling */ | |
787 | /* edi: new selector */ | |
788 | ENTRY(load_gs_index) | |
7effaa88 | 789 | CFI_STARTPROC |
1da177e4 | 790 | pushf |
7effaa88 | 791 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
792 | cli |
793 | swapgs | |
794 | gs_change: | |
795 | movl %edi,%gs | |
796 | 2: mfence /* workaround */ | |
797 | swapgs | |
798 | popf | |
7effaa88 | 799 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 800 | ret |
7effaa88 | 801 | CFI_ENDPROC |
1da177e4 LT |
802 | |
803 | .section __ex_table,"a" | |
804 | .align 8 | |
805 | .quad gs_change,bad_gs | |
806 | .previous | |
807 | .section .fixup,"ax" | |
808 | /* running with kernelgs */ | |
809 | bad_gs: | |
810 | swapgs /* switch back to user gs */ | |
811 | xorl %eax,%eax | |
812 | movl %eax,%gs | |
813 | jmp 2b | |
814 | .previous | |
815 | ||
816 | /* | |
817 | * Create a kernel thread. | |
818 | * | |
819 | * C extern interface: | |
820 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
821 | * | |
822 | * asm input arguments: | |
823 | * rdi: fn, rsi: arg, rdx: flags | |
824 | */ | |
825 | ENTRY(kernel_thread) | |
826 | CFI_STARTPROC | |
827 | FAKE_STACK_FRAME $child_rip | |
828 | SAVE_ALL | |
829 | ||
830 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
831 | movq %rdx,%rdi | |
832 | orq kernel_thread_flags(%rip),%rdi | |
833 | movq $-1, %rsi | |
834 | movq %rsp, %rdx | |
835 | ||
836 | xorl %r8d,%r8d | |
837 | xorl %r9d,%r9d | |
838 | ||
839 | # clone now | |
840 | call do_fork | |
841 | movq %rax,RAX(%rsp) | |
842 | xorl %edi,%edi | |
843 | ||
844 | /* | |
845 | * It isn't worth to check for reschedule here, | |
846 | * so internally to the x86_64 port you can rely on kernel_thread() | |
847 | * not to reschedule the child before returning, this avoids the need | |
848 | * of hacks for example to fork off the per-CPU idle tasks. | |
849 | * [Hopefully no generic code relies on the reschedule -AK] | |
850 | */ | |
851 | RESTORE_ALL | |
852 | UNFAKE_STACK_FRAME | |
853 | ret | |
854 | CFI_ENDPROC | |
855 | ||
856 | ||
857 | child_rip: | |
858 | /* | |
859 | * Here we are in the child and the registers are set as they were | |
860 | * at kernel_thread() invocation in the parent. | |
861 | */ | |
862 | movq %rdi, %rax | |
863 | movq %rsi, %rdi | |
864 | call *%rax | |
865 | # exit | |
3829ee6b | 866 | xorl %edi, %edi |
1da177e4 LT |
867 | call do_exit |
868 | ||
869 | /* | |
870 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
871 | * | |
872 | * C extern interface: | |
873 | * extern long execve(char *name, char **argv, char **envp) | |
874 | * | |
875 | * asm input arguments: | |
876 | * rdi: name, rsi: argv, rdx: envp | |
877 | * | |
878 | * We want to fallback into: | |
879 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
880 | * | |
881 | * do_sys_execve asm fallback arguments: | |
882 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
883 | */ | |
884 | ENTRY(execve) | |
885 | CFI_STARTPROC | |
886 | FAKE_STACK_FRAME $0 | |
887 | SAVE_ALL | |
888 | call sys_execve | |
889 | movq %rax, RAX(%rsp) | |
890 | RESTORE_REST | |
891 | testq %rax,%rax | |
892 | je int_ret_from_sys_call | |
893 | RESTORE_ARGS | |
894 | UNFAKE_STACK_FRAME | |
895 | ret | |
896 | CFI_ENDPROC | |
897 | ||
0f2fbdcb | 898 | KPROBE_ENTRY(page_fault) |
1da177e4 | 899 | errorentry do_page_fault |
0f2fbdcb | 900 | .previous .text |
1da177e4 LT |
901 | |
902 | ENTRY(coprocessor_error) | |
903 | zeroentry do_coprocessor_error | |
904 | ||
905 | ENTRY(simd_coprocessor_error) | |
906 | zeroentry do_simd_coprocessor_error | |
907 | ||
908 | ENTRY(device_not_available) | |
909 | zeroentry math_state_restore | |
910 | ||
911 | /* runs on exception stack */ | |
0f2fbdcb | 912 | KPROBE_ENTRY(debug) |
7effaa88 | 913 | INTR_FRAME |
1da177e4 LT |
914 | pushq $0 |
915 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 916 | paranoidentry do_debug, DEBUG_STACK |
1da177e4 LT |
917 | jmp paranoid_exit |
918 | CFI_ENDPROC | |
0f2fbdcb | 919 | .previous .text |
1da177e4 LT |
920 | |
921 | /* runs on exception stack */ | |
eddb6fb9 | 922 | KPROBE_ENTRY(nmi) |
7effaa88 | 923 | INTR_FRAME |
1da177e4 | 924 | pushq $-1 |
7effaa88 | 925 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 926 | paranoidentry do_nmi |
6fefb0d1 AK |
927 | /* |
928 | * "Paranoid" exit path from exception stack. | |
929 | * Paranoid because this is used by NMIs and cannot take | |
930 | * any kernel state for granted. | |
931 | * We don't do kernel preemption checks here, because only | |
932 | * NMI should be common and it does not enable IRQs and | |
933 | * cannot get reschedule ticks. | |
934 | */ | |
1da177e4 LT |
935 | /* ebx: no swapgs flag */ |
936 | paranoid_exit: | |
937 | testl %ebx,%ebx /* swapgs needed? */ | |
938 | jnz paranoid_restore | |
6fefb0d1 AK |
939 | testl $3,CS(%rsp) |
940 | jnz paranoid_userspace | |
1da177e4 | 941 | paranoid_swapgs: |
1da177e4 LT |
942 | swapgs |
943 | paranoid_restore: | |
944 | RESTORE_ALL 8 | |
945 | iretq | |
946 | paranoid_userspace: | |
1da177e4 | 947 | GET_THREAD_INFO(%rcx) |
6fefb0d1 AK |
948 | movl threadinfo_flags(%rcx),%ebx |
949 | andl $_TIF_WORK_MASK,%ebx | |
11b854b2 | 950 | jz paranoid_swapgs |
6fefb0d1 AK |
951 | movq %rsp,%rdi /* &pt_regs */ |
952 | call sync_regs | |
953 | movq %rax,%rsp /* switch stack for scheduling */ | |
954 | testl $_TIF_NEED_RESCHED,%ebx | |
955 | jnz paranoid_schedule | |
956 | movl %ebx,%edx /* arg3: thread flags */ | |
1da177e4 | 957 | sti |
6fefb0d1 AK |
958 | xorl %esi,%esi /* arg2: oldset */ |
959 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1da177e4 | 960 | call do_notify_resume |
6fefb0d1 AK |
961 | cli |
962 | jmp paranoid_userspace | |
963 | paranoid_schedule: | |
11b854b2 AK |
964 | sti |
965 | call schedule | |
6fefb0d1 AK |
966 | cli |
967 | jmp paranoid_userspace | |
1da177e4 | 968 | CFI_ENDPROC |
eddb6fb9 | 969 | .previous .text |
6fefb0d1 | 970 | |
0f2fbdcb | 971 | KPROBE_ENTRY(int3) |
b556b35e JB |
972 | INTR_FRAME |
973 | pushq $0 | |
974 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 975 | paranoidentry do_int3, DEBUG_STACK |
b556b35e JB |
976 | jmp paranoid_exit |
977 | CFI_ENDPROC | |
0f2fbdcb | 978 | .previous .text |
1da177e4 LT |
979 | |
980 | ENTRY(overflow) | |
981 | zeroentry do_overflow | |
982 | ||
983 | ENTRY(bounds) | |
984 | zeroentry do_bounds | |
985 | ||
986 | ENTRY(invalid_op) | |
987 | zeroentry do_invalid_op | |
988 | ||
989 | ENTRY(coprocessor_segment_overrun) | |
990 | zeroentry do_coprocessor_segment_overrun | |
991 | ||
992 | ENTRY(reserved) | |
993 | zeroentry do_reserved | |
994 | ||
995 | /* runs on exception stack */ | |
996 | ENTRY(double_fault) | |
7effaa88 | 997 | XCPT_FRAME |
1da177e4 | 998 | paranoidentry do_double_fault |
1da177e4 LT |
999 | jmp paranoid_exit |
1000 | CFI_ENDPROC | |
1001 | ||
1002 | ENTRY(invalid_TSS) | |
1003 | errorentry do_invalid_TSS | |
1004 | ||
1005 | ENTRY(segment_not_present) | |
1006 | errorentry do_segment_not_present | |
1007 | ||
1008 | /* runs on exception stack */ | |
1009 | ENTRY(stack_segment) | |
7effaa88 | 1010 | XCPT_FRAME |
1da177e4 | 1011 | paranoidentry do_stack_segment |
1da177e4 LT |
1012 | jmp paranoid_exit |
1013 | CFI_ENDPROC | |
1014 | ||
0f2fbdcb | 1015 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1016 | errorentry do_general_protection |
0f2fbdcb | 1017 | .previous .text |
1da177e4 LT |
1018 | |
1019 | ENTRY(alignment_check) | |
1020 | errorentry do_alignment_check | |
1021 | ||
1022 | ENTRY(divide_error) | |
1023 | zeroentry do_divide_error | |
1024 | ||
1025 | ENTRY(spurious_interrupt_bug) | |
1026 | zeroentry do_spurious_interrupt_bug | |
1027 | ||
1028 | #ifdef CONFIG_X86_MCE | |
1029 | /* runs on exception stack */ | |
1030 | ENTRY(machine_check) | |
7effaa88 | 1031 | INTR_FRAME |
1da177e4 LT |
1032 | pushq $0 |
1033 | CFI_ADJUST_CFA_OFFSET 8 | |
1034 | paranoidentry do_machine_check | |
1035 | jmp paranoid_exit | |
1036 | CFI_ENDPROC | |
1037 | #endif | |
1038 | ||
ed6b676c | 1039 | ENTRY(call_softirq) |
7effaa88 | 1040 | CFI_STARTPROC |
ed6b676c | 1041 | movq %gs:pda_irqstackptr,%rax |
bd9cb64d JB |
1042 | movq %rsp,%rdx |
1043 | CFI_DEF_CFA_REGISTER rdx | |
ed6b676c AK |
1044 | incl %gs:pda_irqcount |
1045 | cmove %rax,%rsp | |
bd9cb64d JB |
1046 | pushq %rdx |
1047 | /*todo CFI_DEF_CFA_EXPRESSION ...*/ | |
ed6b676c | 1048 | call __do_softirq |
bd9cb64d | 1049 | popq %rsp |
7effaa88 | 1050 | CFI_DEF_CFA_REGISTER rsp |
ed6b676c | 1051 | decl %gs:pda_irqcount |
ed6b676c | 1052 | ret |
7effaa88 | 1053 | CFI_ENDPROC |