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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 | |
4b787e0b | 157 | END(ret_from_fork) |
1da177e4 LT |
158 | |
159 | /* | |
160 | * System call entry. Upto 6 arguments in registers are supported. | |
161 | * | |
162 | * SYSCALL does not save anything on the stack and does not change the | |
163 | * stack pointer. | |
164 | */ | |
165 | ||
166 | /* | |
167 | * Register setup: | |
168 | * rax system call number | |
169 | * rdi arg0 | |
170 | * rcx return address for syscall/sysret, C arg3 | |
171 | * rsi arg1 | |
172 | * rdx arg2 | |
173 | * r10 arg3 (--> moved to rcx for C) | |
174 | * r8 arg4 | |
175 | * r9 arg5 | |
176 | * r11 eflags for syscall/sysret, temporary for C | |
177 | * r12-r15,rbp,rbx saved by C code, not touched. | |
178 | * | |
179 | * Interrupts are off on entry. | |
180 | * Only called from user space. | |
181 | * | |
182 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
183 | * and report it properly in ps. Unfortunately we haven't. | |
7bf36bbc AK |
184 | * |
185 | * When user can change the frames always force IRET. That is because | |
186 | * it deals with uncanonical addresses better. SYSRET has trouble | |
187 | * with them due to bugs in both AMD and Intel CPUs. | |
1da177e4 LT |
188 | */ |
189 | ||
190 | ENTRY(system_call) | |
7effaa88 JB |
191 | CFI_STARTPROC simple |
192 | CFI_DEF_CFA rsp,0 | |
193 | CFI_REGISTER rip,rcx | |
194 | /*CFI_REGISTER rflags,r11*/ | |
1da177e4 LT |
195 | swapgs |
196 | movq %rsp,%gs:pda_oldrsp | |
197 | movq %gs:pda_kernelstack,%rsp | |
198 | sti | |
199 | SAVE_ARGS 8,1 | |
200 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) | |
7effaa88 JB |
201 | movq %rcx,RIP-ARGOFFSET(%rsp) |
202 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 LT |
203 | GET_THREAD_INFO(%rcx) |
204 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx) | |
7effaa88 | 205 | CFI_REMEMBER_STATE |
1da177e4 LT |
206 | jnz tracesys |
207 | cmpq $__NR_syscall_max,%rax | |
208 | ja badsys | |
209 | movq %r10,%rcx | |
210 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
211 | movq %rax,RAX-ARGOFFSET(%rsp) | |
212 | /* | |
213 | * Syscall return path ending with SYSRET (fast path) | |
214 | * Has incomplete stack frame and undefined top of stack. | |
215 | */ | |
216 | .globl ret_from_sys_call | |
217 | ret_from_sys_call: | |
11b854b2 | 218 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 LT |
219 | /* edi: flagmask */ |
220 | sysret_check: | |
221 | GET_THREAD_INFO(%rcx) | |
222 | cli | |
223 | movl threadinfo_flags(%rcx),%edx | |
224 | andl %edi,%edx | |
7effaa88 | 225 | CFI_REMEMBER_STATE |
1da177e4 LT |
226 | jnz sysret_careful |
227 | movq RIP-ARGOFFSET(%rsp),%rcx | |
7effaa88 | 228 | CFI_REGISTER rip,rcx |
1da177e4 | 229 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 230 | /*CFI_REGISTER rflags,r11*/ |
1da177e4 LT |
231 | movq %gs:pda_oldrsp,%rsp |
232 | swapgs | |
233 | sysretq | |
234 | ||
235 | /* Handle reschedules */ | |
236 | /* edx: work, edi: workmask */ | |
237 | sysret_careful: | |
7effaa88 | 238 | CFI_RESTORE_STATE |
1da177e4 LT |
239 | bt $TIF_NEED_RESCHED,%edx |
240 | jnc sysret_signal | |
241 | sti | |
242 | pushq %rdi | |
7effaa88 | 243 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
244 | call schedule |
245 | popq %rdi | |
7effaa88 | 246 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
247 | jmp sysret_check |
248 | ||
249 | /* Handle a signal */ | |
250 | sysret_signal: | |
251 | sti | |
10ffdbb8 AK |
252 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
253 | jz 1f | |
254 | ||
255 | /* Really a signal */ | |
256 | /* edx: work flags (arg3) */ | |
1da177e4 LT |
257 | leaq do_notify_resume(%rip),%rax |
258 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
259 | xorl %esi,%esi # oldset -> arg2 | |
260 | call ptregscall_common | |
10ffdbb8 | 261 | 1: movl $_TIF_NEED_RESCHED,%edi |
7bf36bbc AK |
262 | /* Use IRET because user could have changed frame. This |
263 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ | |
264 | cli | |
265 | jmp int_with_check | |
1da177e4 | 266 | |
7effaa88 JB |
267 | badsys: |
268 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
269 | jmp ret_from_sys_call | |
270 | ||
1da177e4 LT |
271 | /* Do syscall tracing */ |
272 | tracesys: | |
7effaa88 | 273 | CFI_RESTORE_STATE |
1da177e4 LT |
274 | SAVE_REST |
275 | movq $-ENOSYS,RAX(%rsp) | |
276 | FIXUP_TOP_OF_STACK %rdi | |
277 | movq %rsp,%rdi | |
278 | call syscall_trace_enter | |
279 | LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */ | |
280 | RESTORE_REST | |
281 | cmpq $__NR_syscall_max,%rax | |
282 | ja 1f | |
283 | movq %r10,%rcx /* fixup for C */ | |
284 | call *sys_call_table(,%rax,8) | |
822ff019 | 285 | 1: movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc AK |
286 | /* Use IRET because user could have changed frame */ |
287 | jmp int_ret_from_sys_call | |
7effaa88 | 288 | CFI_ENDPROC |
4b787e0b | 289 | END(system_call) |
1da177e4 | 290 | |
1da177e4 LT |
291 | /* |
292 | * Syscall return path ending with IRET. | |
293 | * Has correct top of stack, but partial stack frame. | |
294 | */ | |
7effaa88 JB |
295 | ENTRY(int_ret_from_sys_call) |
296 | CFI_STARTPROC simple | |
297 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET | |
298 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
299 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
300 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
301 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
302 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
303 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
304 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
305 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
306 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
307 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
308 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
309 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
310 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
311 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 LT |
312 | cli |
313 | testl $3,CS-ARGOFFSET(%rsp) | |
314 | je retint_restore_args | |
315 | movl $_TIF_ALLWORK_MASK,%edi | |
316 | /* edi: mask to check */ | |
317 | int_with_check: | |
318 | GET_THREAD_INFO(%rcx) | |
319 | movl threadinfo_flags(%rcx),%edx | |
320 | andl %edi,%edx | |
321 | jnz int_careful | |
bf2fcc6f | 322 | andl $~TS_COMPAT,threadinfo_status(%rcx) |
1da177e4 LT |
323 | jmp retint_swapgs |
324 | ||
325 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
326 | /* First do a reschedule test. */ | |
327 | /* edx: work, edi: workmask */ | |
328 | int_careful: | |
329 | bt $TIF_NEED_RESCHED,%edx | |
330 | jnc int_very_careful | |
331 | sti | |
332 | pushq %rdi | |
7effaa88 | 333 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
334 | call schedule |
335 | popq %rdi | |
7effaa88 | 336 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 337 | cli |
1da177e4 LT |
338 | jmp int_with_check |
339 | ||
340 | /* handle signals and tracing -- both require a full stack frame */ | |
341 | int_very_careful: | |
342 | sti | |
343 | SAVE_REST | |
344 | /* Check for syscall exit trace */ | |
345 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
346 | jz int_signal | |
347 | pushq %rdi | |
7effaa88 | 348 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
349 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
350 | call syscall_trace_leave | |
351 | popq %rdi | |
7effaa88 | 352 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 353 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 354 | cli |
1da177e4 LT |
355 | jmp int_restore_rest |
356 | ||
357 | int_signal: | |
358 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
359 | jz 1f | |
360 | movq %rsp,%rdi # &ptregs -> arg1 | |
361 | xorl %esi,%esi # oldset -> arg2 | |
362 | call do_notify_resume | |
363 | 1: movl $_TIF_NEED_RESCHED,%edi | |
364 | int_restore_rest: | |
365 | RESTORE_REST | |
be9e6870 | 366 | cli |
1da177e4 LT |
367 | jmp int_with_check |
368 | CFI_ENDPROC | |
4b787e0b | 369 | END(int_ret_from_sys_call) |
1da177e4 LT |
370 | |
371 | /* | |
372 | * Certain special system calls that need to save a complete full stack frame. | |
373 | */ | |
374 | ||
375 | .macro PTREGSCALL label,func,arg | |
376 | .globl \label | |
377 | \label: | |
378 | leaq \func(%rip),%rax | |
379 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
380 | jmp ptregscall_common | |
4b787e0b | 381 | END(\label) |
1da177e4 LT |
382 | .endm |
383 | ||
7effaa88 JB |
384 | CFI_STARTPROC |
385 | ||
1da177e4 LT |
386 | PTREGSCALL stub_clone, sys_clone, %r8 |
387 | PTREGSCALL stub_fork, sys_fork, %rdi | |
388 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
389 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
390 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
391 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
392 | ||
393 | ENTRY(ptregscall_common) | |
1da177e4 | 394 | popq %r11 |
7effaa88 JB |
395 | CFI_ADJUST_CFA_OFFSET -8 |
396 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
397 | SAVE_REST |
398 | movq %r11, %r15 | |
7effaa88 | 399 | CFI_REGISTER rip, r15 |
1da177e4 LT |
400 | FIXUP_TOP_OF_STACK %r11 |
401 | call *%rax | |
402 | RESTORE_TOP_OF_STACK %r11 | |
403 | movq %r15, %r11 | |
7effaa88 | 404 | CFI_REGISTER rip, r11 |
1da177e4 LT |
405 | RESTORE_REST |
406 | pushq %r11 | |
7effaa88 JB |
407 | CFI_ADJUST_CFA_OFFSET 8 |
408 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
409 | ret |
410 | CFI_ENDPROC | |
4b787e0b | 411 | END(ptregscall_common) |
1da177e4 LT |
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 | |
4b787e0b | 426 | END(stub_execve) |
1da177e4 LT |
427 | |
428 | /* | |
429 | * sigreturn is special because it needs to restore all registers on return. | |
430 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
431 | */ | |
432 | ENTRY(stub_rt_sigreturn) | |
433 | CFI_STARTPROC | |
7effaa88 JB |
434 | addq $8, %rsp |
435 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
436 | SAVE_REST |
437 | movq %rsp,%rdi | |
438 | FIXUP_TOP_OF_STACK %r11 | |
439 | call sys_rt_sigreturn | |
440 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
441 | RESTORE_REST | |
442 | jmp int_ret_from_sys_call | |
443 | CFI_ENDPROC | |
4b787e0b | 444 | END(stub_rt_sigreturn) |
1da177e4 | 445 | |
7effaa88 JB |
446 | /* |
447 | * initial frame state for interrupts and exceptions | |
448 | */ | |
449 | .macro _frame ref | |
450 | CFI_STARTPROC simple | |
451 | CFI_DEF_CFA rsp,SS+8-\ref | |
452 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
453 | CFI_REL_OFFSET rsp,RSP-\ref | |
454 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
455 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
456 | CFI_REL_OFFSET rip,RIP-\ref | |
457 | .endm | |
458 | ||
459 | /* initial frame state for interrupts (and exceptions without error code) */ | |
460 | #define INTR_FRAME _frame RIP | |
461 | /* initial frame state for exceptions with error code (and interrupts with | |
462 | vector already pushed) */ | |
463 | #define XCPT_FRAME _frame ORIG_RAX | |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Interrupt entry/exit. | |
467 | * | |
468 | * Interrupt entry points save only callee clobbered registers in fast path. | |
469 | * | |
470 | * Entry runs with interrupts off. | |
471 | */ | |
472 | ||
473 | /* 0(%rsp): interrupt number */ | |
474 | .macro interrupt func | |
1da177e4 | 475 | cld |
1da177e4 LT |
476 | SAVE_ARGS |
477 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
1de9c3f6 JB |
478 | pushq %rbp |
479 | CFI_ADJUST_CFA_OFFSET 8 | |
480 | CFI_REL_OFFSET rbp, 0 | |
481 | movq %rsp,%rbp | |
482 | CFI_DEF_CFA_REGISTER rbp | |
1da177e4 LT |
483 | testl $3,CS(%rdi) |
484 | je 1f | |
485 | swapgs | |
3829ee6b | 486 | 1: incl %gs:pda_irqcount # RED-PEN should check preempt count |
1de9c3f6 | 487 | cmoveq %gs:pda_irqstackptr,%rsp |
1da177e4 LT |
488 | call \func |
489 | .endm | |
490 | ||
491 | ENTRY(common_interrupt) | |
7effaa88 | 492 | XCPT_FRAME |
1da177e4 LT |
493 | interrupt do_IRQ |
494 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 495 | ret_from_intr: |
1da177e4 | 496 | cli |
3829ee6b | 497 | decl %gs:pda_irqcount |
1de9c3f6 | 498 | leaveq |
7effaa88 | 499 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 500 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 501 | exit_intr: |
1da177e4 LT |
502 | GET_THREAD_INFO(%rcx) |
503 | testl $3,CS-ARGOFFSET(%rsp) | |
504 | je retint_kernel | |
505 | ||
506 | /* Interrupt came from user space */ | |
507 | /* | |
508 | * Has a correct top of stack, but a partial stack frame | |
509 | * %rcx: thread info. Interrupts off. | |
510 | */ | |
511 | retint_with_reschedule: | |
512 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 513 | retint_check: |
1da177e4 LT |
514 | movl threadinfo_flags(%rcx),%edx |
515 | andl %edi,%edx | |
7effaa88 | 516 | CFI_REMEMBER_STATE |
1da177e4 LT |
517 | jnz retint_careful |
518 | retint_swapgs: | |
1da177e4 LT |
519 | swapgs |
520 | retint_restore_args: | |
521 | cli | |
522 | RESTORE_ARGS 0,8,0 | |
523 | iret_label: | |
524 | iretq | |
525 | ||
526 | .section __ex_table,"a" | |
527 | .quad iret_label,bad_iret | |
528 | .previous | |
529 | .section .fixup,"ax" | |
530 | /* force a signal here? this matches i386 behaviour */ | |
531 | /* running with kernel gs */ | |
532 | bad_iret: | |
3076a492 | 533 | movq $11,%rdi /* SIGSEGV */ |
2391c4b5 | 534 | sti |
1da177e4 LT |
535 | jmp do_exit |
536 | .previous | |
537 | ||
7effaa88 | 538 | /* edi: workmask, edx: work */ |
1da177e4 | 539 | retint_careful: |
7effaa88 | 540 | CFI_RESTORE_STATE |
1da177e4 LT |
541 | bt $TIF_NEED_RESCHED,%edx |
542 | jnc retint_signal | |
543 | sti | |
544 | pushq %rdi | |
7effaa88 | 545 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
546 | call schedule |
547 | popq %rdi | |
7effaa88 | 548 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
549 | GET_THREAD_INFO(%rcx) |
550 | cli | |
551 | jmp retint_check | |
552 | ||
553 | retint_signal: | |
10ffdbb8 AK |
554 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
555 | jz retint_swapgs | |
1da177e4 LT |
556 | sti |
557 | SAVE_REST | |
558 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 559 | xorl %esi,%esi # oldset |
1da177e4 LT |
560 | movq %rsp,%rdi # &pt_regs |
561 | call do_notify_resume | |
562 | RESTORE_REST | |
563 | cli | |
10ffdbb8 | 564 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 565 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
566 | jmp retint_check |
567 | ||
568 | #ifdef CONFIG_PREEMPT | |
569 | /* Returning to kernel space. Check if we need preemption */ | |
570 | /* rcx: threadinfo. interrupts off. */ | |
571 | .p2align | |
572 | retint_kernel: | |
573 | cmpl $0,threadinfo_preempt_count(%rcx) | |
574 | jnz retint_restore_args | |
575 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
576 | jnc retint_restore_args | |
577 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
578 | jnc retint_restore_args | |
579 | call preempt_schedule_irq | |
580 | jmp exit_intr | |
581 | #endif | |
4b787e0b | 582 | |
1da177e4 | 583 | CFI_ENDPROC |
4b787e0b | 584 | END(common_interrupt) |
1da177e4 LT |
585 | |
586 | /* | |
587 | * APIC interrupts. | |
588 | */ | |
589 | .macro apicinterrupt num,func | |
7effaa88 | 590 | INTR_FRAME |
1da177e4 | 591 | pushq $\num-256 |
7effaa88 | 592 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
593 | interrupt \func |
594 | jmp ret_from_intr | |
595 | CFI_ENDPROC | |
596 | .endm | |
597 | ||
598 | ENTRY(thermal_interrupt) | |
599 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 600 | END(thermal_interrupt) |
1da177e4 | 601 | |
89b831ef JS |
602 | ENTRY(threshold_interrupt) |
603 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 604 | END(threshold_interrupt) |
89b831ef | 605 | |
1da177e4 LT |
606 | #ifdef CONFIG_SMP |
607 | ENTRY(reschedule_interrupt) | |
608 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 609 | END(reschedule_interrupt) |
1da177e4 | 610 | |
e5bc8b6b AK |
611 | .macro INVALIDATE_ENTRY num |
612 | ENTRY(invalidate_interrupt\num) | |
613 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
4b787e0b | 614 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
615 | .endm |
616 | ||
617 | INVALIDATE_ENTRY 0 | |
618 | INVALIDATE_ENTRY 1 | |
619 | INVALIDATE_ENTRY 2 | |
620 | INVALIDATE_ENTRY 3 | |
621 | INVALIDATE_ENTRY 4 | |
622 | INVALIDATE_ENTRY 5 | |
623 | INVALIDATE_ENTRY 6 | |
624 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
625 | |
626 | ENTRY(call_function_interrupt) | |
627 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 628 | END(call_function_interrupt) |
1da177e4 LT |
629 | #endif |
630 | ||
631 | #ifdef CONFIG_X86_LOCAL_APIC | |
632 | ENTRY(apic_timer_interrupt) | |
633 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 634 | END(apic_timer_interrupt) |
1da177e4 LT |
635 | |
636 | ENTRY(error_interrupt) | |
637 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 638 | END(error_interrupt) |
1da177e4 LT |
639 | |
640 | ENTRY(spurious_interrupt) | |
641 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 642 | END(spurious_interrupt) |
1da177e4 LT |
643 | #endif |
644 | ||
645 | /* | |
646 | * Exception entry points. | |
647 | */ | |
648 | .macro zeroentry sym | |
7effaa88 | 649 | INTR_FRAME |
1da177e4 | 650 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 651 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 652 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 653 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
654 | leaq \sym(%rip),%rax |
655 | jmp error_entry | |
7effaa88 | 656 | CFI_ENDPROC |
1da177e4 LT |
657 | .endm |
658 | ||
659 | .macro errorentry sym | |
7effaa88 | 660 | XCPT_FRAME |
1da177e4 | 661 | pushq %rax |
7effaa88 | 662 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
663 | leaq \sym(%rip),%rax |
664 | jmp error_entry | |
7effaa88 | 665 | CFI_ENDPROC |
1da177e4 LT |
666 | .endm |
667 | ||
668 | /* error code is on the stack already */ | |
669 | /* handle NMI like exceptions that can happen everywhere */ | |
b556b35e | 670 | .macro paranoidentry sym, ist=0 |
1da177e4 LT |
671 | SAVE_ALL |
672 | cld | |
673 | movl $1,%ebx | |
674 | movl $MSR_GS_BASE,%ecx | |
675 | rdmsr | |
676 | testl %edx,%edx | |
677 | js 1f | |
678 | swapgs | |
679 | xorl %ebx,%ebx | |
b556b35e JB |
680 | 1: |
681 | .if \ist | |
682 | movq %gs:pda_data_offset, %rbp | |
683 | .endif | |
684 | movq %rsp,%rdi | |
1da177e4 LT |
685 | movq ORIG_RAX(%rsp),%rsi |
686 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 687 | .if \ist |
5f8efbb9 | 688 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 689 | .endif |
1da177e4 | 690 | call \sym |
b556b35e | 691 | .if \ist |
5f8efbb9 | 692 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 693 | .endif |
6fefb0d1 | 694 | cli |
1da177e4 LT |
695 | .endm |
696 | ||
697 | /* | |
698 | * Exception entry point. This expects an error code/orig_rax on the stack | |
699 | * and the exception handler in %rax. | |
700 | */ | |
701 | ENTRY(error_entry) | |
7effaa88 | 702 | _frame RDI |
1da177e4 LT |
703 | /* rdi slot contains rax, oldrax contains error code */ |
704 | cld | |
705 | subq $14*8,%rsp | |
706 | CFI_ADJUST_CFA_OFFSET (14*8) | |
707 | movq %rsi,13*8(%rsp) | |
708 | CFI_REL_OFFSET rsi,RSI | |
709 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
710 | movq %rdx,12*8(%rsp) | |
711 | CFI_REL_OFFSET rdx,RDX | |
712 | movq %rcx,11*8(%rsp) | |
713 | CFI_REL_OFFSET rcx,RCX | |
714 | movq %rsi,10*8(%rsp) /* store rax */ | |
715 | CFI_REL_OFFSET rax,RAX | |
716 | movq %r8, 9*8(%rsp) | |
717 | CFI_REL_OFFSET r8,R8 | |
718 | movq %r9, 8*8(%rsp) | |
719 | CFI_REL_OFFSET r9,R9 | |
720 | movq %r10,7*8(%rsp) | |
721 | CFI_REL_OFFSET r10,R10 | |
722 | movq %r11,6*8(%rsp) | |
723 | CFI_REL_OFFSET r11,R11 | |
724 | movq %rbx,5*8(%rsp) | |
725 | CFI_REL_OFFSET rbx,RBX | |
726 | movq %rbp,4*8(%rsp) | |
727 | CFI_REL_OFFSET rbp,RBP | |
728 | movq %r12,3*8(%rsp) | |
729 | CFI_REL_OFFSET r12,R12 | |
730 | movq %r13,2*8(%rsp) | |
731 | CFI_REL_OFFSET r13,R13 | |
732 | movq %r14,1*8(%rsp) | |
733 | CFI_REL_OFFSET r14,R14 | |
734 | movq %r15,(%rsp) | |
735 | CFI_REL_OFFSET r15,R15 | |
736 | xorl %ebx,%ebx | |
737 | testl $3,CS(%rsp) | |
738 | je error_kernelspace | |
739 | error_swapgs: | |
740 | swapgs | |
741 | error_sti: | |
742 | movq %rdi,RDI(%rsp) | |
743 | movq %rsp,%rdi | |
744 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
745 | movq $-1,ORIG_RAX(%rsp) | |
746 | call *%rax | |
747 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
748 | error_exit: | |
749 | movl %ebx,%eax | |
750 | RESTORE_REST | |
751 | cli | |
752 | GET_THREAD_INFO(%rcx) | |
753 | testl %eax,%eax | |
754 | jne retint_kernel | |
755 | movl threadinfo_flags(%rcx),%edx | |
756 | movl $_TIF_WORK_MASK,%edi | |
757 | andl %edi,%edx | |
758 | jnz retint_careful | |
759 | swapgs | |
760 | RESTORE_ARGS 0,8,0 | |
505cc4e1 | 761 | jmp iret_label |
1da177e4 LT |
762 | CFI_ENDPROC |
763 | ||
764 | error_kernelspace: | |
765 | incl %ebx | |
766 | /* There are two places in the kernel that can potentially fault with | |
767 | usergs. Handle them here. The exception handlers after | |
768 | iret run with kernel gs again, so don't set the user space flag. | |
769 | B stepping K8s sometimes report an truncated RIP for IRET | |
770 | exceptions returning to compat mode. Check for these here too. */ | |
771 | leaq iret_label(%rip),%rbp | |
772 | cmpq %rbp,RIP(%rsp) | |
773 | je error_swapgs | |
774 | movl %ebp,%ebp /* zero extend */ | |
775 | cmpq %rbp,RIP(%rsp) | |
776 | je error_swapgs | |
777 | cmpq $gs_change,RIP(%rsp) | |
778 | je error_swapgs | |
779 | jmp error_sti | |
4b787e0b | 780 | END(error_entry) |
1da177e4 LT |
781 | |
782 | /* Reload gs selector with exception handling */ | |
783 | /* edi: new selector */ | |
784 | ENTRY(load_gs_index) | |
7effaa88 | 785 | CFI_STARTPROC |
1da177e4 | 786 | pushf |
7effaa88 | 787 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
788 | cli |
789 | swapgs | |
790 | gs_change: | |
791 | movl %edi,%gs | |
792 | 2: mfence /* workaround */ | |
793 | swapgs | |
794 | popf | |
7effaa88 | 795 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 796 | ret |
7effaa88 | 797 | CFI_ENDPROC |
4b787e0b | 798 | ENDPROC(load_gs_index) |
1da177e4 LT |
799 | |
800 | .section __ex_table,"a" | |
801 | .align 8 | |
802 | .quad gs_change,bad_gs | |
803 | .previous | |
804 | .section .fixup,"ax" | |
805 | /* running with kernelgs */ | |
806 | bad_gs: | |
807 | swapgs /* switch back to user gs */ | |
808 | xorl %eax,%eax | |
809 | movl %eax,%gs | |
810 | jmp 2b | |
811 | .previous | |
812 | ||
813 | /* | |
814 | * Create a kernel thread. | |
815 | * | |
816 | * C extern interface: | |
817 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
818 | * | |
819 | * asm input arguments: | |
820 | * rdi: fn, rsi: arg, rdx: flags | |
821 | */ | |
822 | ENTRY(kernel_thread) | |
823 | CFI_STARTPROC | |
824 | FAKE_STACK_FRAME $child_rip | |
825 | SAVE_ALL | |
826 | ||
827 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
828 | movq %rdx,%rdi | |
829 | orq kernel_thread_flags(%rip),%rdi | |
830 | movq $-1, %rsi | |
831 | movq %rsp, %rdx | |
832 | ||
833 | xorl %r8d,%r8d | |
834 | xorl %r9d,%r9d | |
835 | ||
836 | # clone now | |
837 | call do_fork | |
838 | movq %rax,RAX(%rsp) | |
839 | xorl %edi,%edi | |
840 | ||
841 | /* | |
842 | * It isn't worth to check for reschedule here, | |
843 | * so internally to the x86_64 port you can rely on kernel_thread() | |
844 | * not to reschedule the child before returning, this avoids the need | |
845 | * of hacks for example to fork off the per-CPU idle tasks. | |
846 | * [Hopefully no generic code relies on the reschedule -AK] | |
847 | */ | |
848 | RESTORE_ALL | |
849 | UNFAKE_STACK_FRAME | |
850 | ret | |
851 | CFI_ENDPROC | |
4b787e0b | 852 | ENDPROC(kernel_thread) |
1da177e4 LT |
853 | |
854 | child_rip: | |
855 | /* | |
856 | * Here we are in the child and the registers are set as they were | |
857 | * at kernel_thread() invocation in the parent. | |
858 | */ | |
859 | movq %rdi, %rax | |
860 | movq %rsi, %rdi | |
861 | call *%rax | |
862 | # exit | |
3829ee6b | 863 | xorl %edi, %edi |
1da177e4 | 864 | call do_exit |
4b787e0b | 865 | ENDPROC(child_rip) |
1da177e4 LT |
866 | |
867 | /* | |
868 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
869 | * | |
870 | * C extern interface: | |
871 | * extern long execve(char *name, char **argv, char **envp) | |
872 | * | |
873 | * asm input arguments: | |
874 | * rdi: name, rsi: argv, rdx: envp | |
875 | * | |
876 | * We want to fallback into: | |
877 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
878 | * | |
879 | * do_sys_execve asm fallback arguments: | |
880 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
881 | */ | |
882 | ENTRY(execve) | |
883 | CFI_STARTPROC | |
884 | FAKE_STACK_FRAME $0 | |
885 | SAVE_ALL | |
886 | call sys_execve | |
887 | movq %rax, RAX(%rsp) | |
888 | RESTORE_REST | |
889 | testq %rax,%rax | |
890 | je int_ret_from_sys_call | |
891 | RESTORE_ARGS | |
892 | UNFAKE_STACK_FRAME | |
893 | ret | |
894 | CFI_ENDPROC | |
4b787e0b | 895 | ENDPROC(execve) |
1da177e4 | 896 | |
0f2fbdcb | 897 | KPROBE_ENTRY(page_fault) |
1da177e4 | 898 | errorentry do_page_fault |
4b787e0b | 899 | END(page_fault) |
0f2fbdcb | 900 | .previous .text |
1da177e4 LT |
901 | |
902 | ENTRY(coprocessor_error) | |
903 | zeroentry do_coprocessor_error | |
4b787e0b | 904 | END(coprocessor_error) |
1da177e4 LT |
905 | |
906 | ENTRY(simd_coprocessor_error) | |
907 | zeroentry do_simd_coprocessor_error | |
4b787e0b | 908 | END(simd_coprocessor_error) |
1da177e4 LT |
909 | |
910 | ENTRY(device_not_available) | |
911 | zeroentry math_state_restore | |
4b787e0b | 912 | END(device_not_available) |
1da177e4 LT |
913 | |
914 | /* runs on exception stack */ | |
0f2fbdcb | 915 | KPROBE_ENTRY(debug) |
7effaa88 | 916 | INTR_FRAME |
1da177e4 LT |
917 | pushq $0 |
918 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 919 | paranoidentry do_debug, DEBUG_STACK |
1da177e4 LT |
920 | jmp paranoid_exit |
921 | CFI_ENDPROC | |
4b787e0b | 922 | END(debug) |
0f2fbdcb | 923 | .previous .text |
1da177e4 LT |
924 | |
925 | /* runs on exception stack */ | |
eddb6fb9 | 926 | KPROBE_ENTRY(nmi) |
7effaa88 | 927 | INTR_FRAME |
1da177e4 | 928 | pushq $-1 |
7effaa88 | 929 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 930 | paranoidentry do_nmi |
6fefb0d1 AK |
931 | /* |
932 | * "Paranoid" exit path from exception stack. | |
933 | * Paranoid because this is used by NMIs and cannot take | |
934 | * any kernel state for granted. | |
935 | * We don't do kernel preemption checks here, because only | |
936 | * NMI should be common and it does not enable IRQs and | |
937 | * cannot get reschedule ticks. | |
938 | */ | |
1da177e4 LT |
939 | /* ebx: no swapgs flag */ |
940 | paranoid_exit: | |
941 | testl %ebx,%ebx /* swapgs needed? */ | |
942 | jnz paranoid_restore | |
6fefb0d1 AK |
943 | testl $3,CS(%rsp) |
944 | jnz paranoid_userspace | |
1da177e4 | 945 | paranoid_swapgs: |
1da177e4 LT |
946 | swapgs |
947 | paranoid_restore: | |
948 | RESTORE_ALL 8 | |
949 | iretq | |
950 | paranoid_userspace: | |
1da177e4 | 951 | GET_THREAD_INFO(%rcx) |
6fefb0d1 AK |
952 | movl threadinfo_flags(%rcx),%ebx |
953 | andl $_TIF_WORK_MASK,%ebx | |
11b854b2 | 954 | jz paranoid_swapgs |
6fefb0d1 AK |
955 | movq %rsp,%rdi /* &pt_regs */ |
956 | call sync_regs | |
957 | movq %rax,%rsp /* switch stack for scheduling */ | |
958 | testl $_TIF_NEED_RESCHED,%ebx | |
959 | jnz paranoid_schedule | |
960 | movl %ebx,%edx /* arg3: thread flags */ | |
1da177e4 | 961 | sti |
6fefb0d1 AK |
962 | xorl %esi,%esi /* arg2: oldset */ |
963 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1da177e4 | 964 | call do_notify_resume |
6fefb0d1 AK |
965 | cli |
966 | jmp paranoid_userspace | |
967 | paranoid_schedule: | |
11b854b2 AK |
968 | sti |
969 | call schedule | |
6fefb0d1 AK |
970 | cli |
971 | jmp paranoid_userspace | |
1da177e4 | 972 | CFI_ENDPROC |
4b787e0b | 973 | END(nmi) |
eddb6fb9 | 974 | .previous .text |
6fefb0d1 | 975 | |
0f2fbdcb | 976 | KPROBE_ENTRY(int3) |
b556b35e JB |
977 | INTR_FRAME |
978 | pushq $0 | |
979 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 980 | paranoidentry do_int3, DEBUG_STACK |
b556b35e JB |
981 | jmp paranoid_exit |
982 | CFI_ENDPROC | |
4b787e0b | 983 | END(int3) |
0f2fbdcb | 984 | .previous .text |
1da177e4 LT |
985 | |
986 | ENTRY(overflow) | |
987 | zeroentry do_overflow | |
4b787e0b | 988 | END(overflow) |
1da177e4 LT |
989 | |
990 | ENTRY(bounds) | |
991 | zeroentry do_bounds | |
4b787e0b | 992 | END(bounds) |
1da177e4 LT |
993 | |
994 | ENTRY(invalid_op) | |
995 | zeroentry do_invalid_op | |
4b787e0b | 996 | END(invalid_op) |
1da177e4 LT |
997 | |
998 | ENTRY(coprocessor_segment_overrun) | |
999 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 1000 | END(coprocessor_segment_overrun) |
1da177e4 LT |
1001 | |
1002 | ENTRY(reserved) | |
1003 | zeroentry do_reserved | |
4b787e0b | 1004 | END(reserved) |
1da177e4 LT |
1005 | |
1006 | /* runs on exception stack */ | |
1007 | ENTRY(double_fault) | |
7effaa88 | 1008 | XCPT_FRAME |
1da177e4 | 1009 | paranoidentry do_double_fault |
1da177e4 LT |
1010 | jmp paranoid_exit |
1011 | CFI_ENDPROC | |
4b787e0b | 1012 | END(double_fault) |
1da177e4 LT |
1013 | |
1014 | ENTRY(invalid_TSS) | |
1015 | errorentry do_invalid_TSS | |
4b787e0b | 1016 | END(invalid_TSS) |
1da177e4 LT |
1017 | |
1018 | ENTRY(segment_not_present) | |
1019 | errorentry do_segment_not_present | |
4b787e0b | 1020 | END(segment_not_present) |
1da177e4 LT |
1021 | |
1022 | /* runs on exception stack */ | |
1023 | ENTRY(stack_segment) | |
7effaa88 | 1024 | XCPT_FRAME |
1da177e4 | 1025 | paranoidentry do_stack_segment |
1da177e4 LT |
1026 | jmp paranoid_exit |
1027 | CFI_ENDPROC | |
4b787e0b | 1028 | END(stack_segment) |
1da177e4 | 1029 | |
0f2fbdcb | 1030 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1031 | errorentry do_general_protection |
4b787e0b | 1032 | END(general_protection) |
0f2fbdcb | 1033 | .previous .text |
1da177e4 LT |
1034 | |
1035 | ENTRY(alignment_check) | |
1036 | errorentry do_alignment_check | |
4b787e0b | 1037 | END(alignment_check) |
1da177e4 LT |
1038 | |
1039 | ENTRY(divide_error) | |
1040 | zeroentry do_divide_error | |
4b787e0b | 1041 | END(divide_error) |
1da177e4 LT |
1042 | |
1043 | ENTRY(spurious_interrupt_bug) | |
1044 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1045 | END(spurious_interrupt_bug) |
1da177e4 LT |
1046 | |
1047 | #ifdef CONFIG_X86_MCE | |
1048 | /* runs on exception stack */ | |
1049 | ENTRY(machine_check) | |
7effaa88 | 1050 | INTR_FRAME |
1da177e4 LT |
1051 | pushq $0 |
1052 | CFI_ADJUST_CFA_OFFSET 8 | |
1053 | paranoidentry do_machine_check | |
1054 | jmp paranoid_exit | |
1055 | CFI_ENDPROC | |
4b787e0b | 1056 | END(machine_check) |
1da177e4 LT |
1057 | #endif |
1058 | ||
ed6b676c | 1059 | ENTRY(call_softirq) |
7effaa88 | 1060 | CFI_STARTPROC |
ed6b676c | 1061 | movq %gs:pda_irqstackptr,%rax |
bd9cb64d JB |
1062 | movq %rsp,%rdx |
1063 | CFI_DEF_CFA_REGISTER rdx | |
ed6b676c AK |
1064 | incl %gs:pda_irqcount |
1065 | cmove %rax,%rsp | |
bd9cb64d JB |
1066 | pushq %rdx |
1067 | /*todo CFI_DEF_CFA_EXPRESSION ...*/ | |
ed6b676c | 1068 | call __do_softirq |
bd9cb64d | 1069 | popq %rsp |
7effaa88 | 1070 | CFI_DEF_CFA_REGISTER rsp |
ed6b676c | 1071 | decl %gs:pda_irqcount |
ed6b676c | 1072 | ret |
7effaa88 | 1073 | CFI_ENDPROC |
4b787e0b | 1074 | ENDPROC(call_softirq) |
b538ed27 JB |
1075 | |
1076 | #ifdef CONFIG_STACK_UNWIND | |
1077 | ENTRY(arch_unwind_init_running) | |
1078 | CFI_STARTPROC | |
1079 | movq %r15, R15(%rdi) | |
1080 | movq %r14, R14(%rdi) | |
1081 | xchgq %rsi, %rdx | |
1082 | movq %r13, R13(%rdi) | |
1083 | movq %r12, R12(%rdi) | |
1084 | xorl %eax, %eax | |
1085 | movq %rbp, RBP(%rdi) | |
1086 | movq %rbx, RBX(%rdi) | |
1087 | movq (%rsp), %rcx | |
1088 | movq %rax, R11(%rdi) | |
1089 | movq %rax, R10(%rdi) | |
1090 | movq %rax, R9(%rdi) | |
1091 | movq %rax, R8(%rdi) | |
1092 | movq %rax, RAX(%rdi) | |
1093 | movq %rax, RCX(%rdi) | |
1094 | movq %rax, RDX(%rdi) | |
1095 | movq %rax, RSI(%rdi) | |
1096 | movq %rax, RDI(%rdi) | |
1097 | movq %rax, ORIG_RAX(%rdi) | |
1098 | movq %rcx, RIP(%rdi) | |
1099 | leaq 8(%rsp), %rcx | |
1100 | movq $__KERNEL_CS, CS(%rdi) | |
1101 | movq %rax, EFLAGS(%rdi) | |
1102 | movq %rcx, RSP(%rdi) | |
1103 | movq $__KERNEL_DS, SS(%rdi) | |
1104 | jmpq *%rdx | |
1105 | CFI_ENDPROC | |
1106 | ENDPROC(arch_unwind_init_running) | |
1107 | #endif |