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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 | |
1da177e4 LT |
31 | #include <linux/linkage.h> |
32 | #include <asm/segment.h> | |
33 | #include <asm/smp.h> | |
34 | #include <asm/cache.h> | |
35 | #include <asm/errno.h> | |
36 | #include <asm/dwarf2.h> | |
37 | #include <asm/calling.h> | |
e2d5df93 | 38 | #include <asm/asm-offsets.h> |
1da177e4 LT |
39 | #include <asm/msr.h> |
40 | #include <asm/unistd.h> | |
41 | #include <asm/thread_info.h> | |
42 | #include <asm/hw_irq.h> | |
5f8efbb9 | 43 | #include <asm/page.h> |
1da177e4 LT |
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 | |
4b787e0b | 156 | END(ret_from_fork) |
1da177e4 LT |
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 | 190 | CFI_STARTPROC simple |
dffead4e | 191 | CFI_DEF_CFA rsp,PDA_STACKOFFSET |
7effaa88 JB |
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) | |
822ff019 | 284 | 1: movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc AK |
285 | /* Use IRET because user could have changed frame */ |
286 | jmp int_ret_from_sys_call | |
7effaa88 | 287 | CFI_ENDPROC |
4b787e0b | 288 | END(system_call) |
1da177e4 | 289 | |
1da177e4 LT |
290 | /* |
291 | * Syscall return path ending with IRET. | |
292 | * Has correct top of stack, but partial stack frame. | |
293 | */ | |
7effaa88 JB |
294 | ENTRY(int_ret_from_sys_call) |
295 | CFI_STARTPROC simple | |
296 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET | |
297 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
298 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
299 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
300 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
301 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
302 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
303 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
304 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
305 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
306 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
307 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
308 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
309 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
310 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 LT |
311 | cli |
312 | testl $3,CS-ARGOFFSET(%rsp) | |
313 | je retint_restore_args | |
314 | movl $_TIF_ALLWORK_MASK,%edi | |
315 | /* edi: mask to check */ | |
316 | int_with_check: | |
317 | GET_THREAD_INFO(%rcx) | |
318 | movl threadinfo_flags(%rcx),%edx | |
319 | andl %edi,%edx | |
320 | jnz int_careful | |
bf2fcc6f | 321 | andl $~TS_COMPAT,threadinfo_status(%rcx) |
1da177e4 LT |
322 | jmp retint_swapgs |
323 | ||
324 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
325 | /* First do a reschedule test. */ | |
326 | /* edx: work, edi: workmask */ | |
327 | int_careful: | |
328 | bt $TIF_NEED_RESCHED,%edx | |
329 | jnc int_very_careful | |
330 | sti | |
331 | pushq %rdi | |
7effaa88 | 332 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
333 | call schedule |
334 | popq %rdi | |
7effaa88 | 335 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 336 | cli |
1da177e4 LT |
337 | jmp int_with_check |
338 | ||
339 | /* handle signals and tracing -- both require a full stack frame */ | |
340 | int_very_careful: | |
341 | sti | |
342 | SAVE_REST | |
343 | /* Check for syscall exit trace */ | |
344 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
345 | jz int_signal | |
346 | pushq %rdi | |
7effaa88 | 347 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
348 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
349 | call syscall_trace_leave | |
350 | popq %rdi | |
7effaa88 | 351 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 352 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 353 | cli |
1da177e4 LT |
354 | jmp int_restore_rest |
355 | ||
356 | int_signal: | |
357 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
358 | jz 1f | |
359 | movq %rsp,%rdi # &ptregs -> arg1 | |
360 | xorl %esi,%esi # oldset -> arg2 | |
361 | call do_notify_resume | |
362 | 1: movl $_TIF_NEED_RESCHED,%edi | |
363 | int_restore_rest: | |
364 | RESTORE_REST | |
be9e6870 | 365 | cli |
1da177e4 LT |
366 | jmp int_with_check |
367 | CFI_ENDPROC | |
4b787e0b | 368 | END(int_ret_from_sys_call) |
1da177e4 LT |
369 | |
370 | /* | |
371 | * Certain special system calls that need to save a complete full stack frame. | |
372 | */ | |
373 | ||
374 | .macro PTREGSCALL label,func,arg | |
375 | .globl \label | |
376 | \label: | |
377 | leaq \func(%rip),%rax | |
378 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
379 | jmp ptregscall_common | |
4b787e0b | 380 | END(\label) |
1da177e4 LT |
381 | .endm |
382 | ||
7effaa88 JB |
383 | CFI_STARTPROC |
384 | ||
1da177e4 LT |
385 | PTREGSCALL stub_clone, sys_clone, %r8 |
386 | PTREGSCALL stub_fork, sys_fork, %rdi | |
387 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
388 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
389 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
390 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
391 | ||
392 | ENTRY(ptregscall_common) | |
1da177e4 | 393 | popq %r11 |
7effaa88 JB |
394 | CFI_ADJUST_CFA_OFFSET -8 |
395 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
396 | SAVE_REST |
397 | movq %r11, %r15 | |
7effaa88 | 398 | CFI_REGISTER rip, r15 |
1da177e4 LT |
399 | FIXUP_TOP_OF_STACK %r11 |
400 | call *%rax | |
401 | RESTORE_TOP_OF_STACK %r11 | |
402 | movq %r15, %r11 | |
7effaa88 | 403 | CFI_REGISTER rip, r11 |
1da177e4 LT |
404 | RESTORE_REST |
405 | pushq %r11 | |
7effaa88 JB |
406 | CFI_ADJUST_CFA_OFFSET 8 |
407 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
408 | ret |
409 | CFI_ENDPROC | |
4b787e0b | 410 | END(ptregscall_common) |
1da177e4 LT |
411 | |
412 | ENTRY(stub_execve) | |
413 | CFI_STARTPROC | |
414 | popq %r11 | |
7effaa88 JB |
415 | CFI_ADJUST_CFA_OFFSET -8 |
416 | CFI_REGISTER rip, r11 | |
1da177e4 | 417 | SAVE_REST |
1da177e4 LT |
418 | FIXUP_TOP_OF_STACK %r11 |
419 | call sys_execve | |
1da177e4 | 420 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
421 | movq %rax,RAX(%rsp) |
422 | RESTORE_REST | |
423 | jmp int_ret_from_sys_call | |
424 | CFI_ENDPROC | |
4b787e0b | 425 | END(stub_execve) |
1da177e4 LT |
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 | |
4b787e0b | 443 | END(stub_rt_sigreturn) |
1da177e4 | 444 | |
7effaa88 JB |
445 | /* |
446 | * initial frame state for interrupts and exceptions | |
447 | */ | |
448 | .macro _frame ref | |
449 | CFI_STARTPROC simple | |
450 | CFI_DEF_CFA rsp,SS+8-\ref | |
451 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
452 | CFI_REL_OFFSET rsp,RSP-\ref | |
453 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
454 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
455 | CFI_REL_OFFSET rip,RIP-\ref | |
456 | .endm | |
457 | ||
458 | /* initial frame state for interrupts (and exceptions without error code) */ | |
459 | #define INTR_FRAME _frame RIP | |
460 | /* initial frame state for exceptions with error code (and interrupts with | |
461 | vector already pushed) */ | |
462 | #define XCPT_FRAME _frame ORIG_RAX | |
463 | ||
1da177e4 LT |
464 | /* |
465 | * Interrupt entry/exit. | |
466 | * | |
467 | * Interrupt entry points save only callee clobbered registers in fast path. | |
468 | * | |
469 | * Entry runs with interrupts off. | |
470 | */ | |
471 | ||
472 | /* 0(%rsp): interrupt number */ | |
473 | .macro interrupt func | |
1da177e4 | 474 | cld |
1da177e4 LT |
475 | SAVE_ARGS |
476 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
1de9c3f6 JB |
477 | pushq %rbp |
478 | CFI_ADJUST_CFA_OFFSET 8 | |
479 | CFI_REL_OFFSET rbp, 0 | |
480 | movq %rsp,%rbp | |
481 | CFI_DEF_CFA_REGISTER rbp | |
1da177e4 LT |
482 | testl $3,CS(%rdi) |
483 | je 1f | |
484 | swapgs | |
3829ee6b | 485 | 1: incl %gs:pda_irqcount # RED-PEN should check preempt count |
1de9c3f6 | 486 | cmoveq %gs:pda_irqstackptr,%rsp |
1da177e4 LT |
487 | call \func |
488 | .endm | |
489 | ||
490 | ENTRY(common_interrupt) | |
7effaa88 | 491 | XCPT_FRAME |
1da177e4 LT |
492 | interrupt do_IRQ |
493 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 494 | ret_from_intr: |
1da177e4 | 495 | cli |
3829ee6b | 496 | decl %gs:pda_irqcount |
1de9c3f6 | 497 | leaveq |
7effaa88 | 498 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 499 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 500 | exit_intr: |
1da177e4 LT |
501 | GET_THREAD_INFO(%rcx) |
502 | testl $3,CS-ARGOFFSET(%rsp) | |
503 | je retint_kernel | |
504 | ||
505 | /* Interrupt came from user space */ | |
506 | /* | |
507 | * Has a correct top of stack, but a partial stack frame | |
508 | * %rcx: thread info. Interrupts off. | |
509 | */ | |
510 | retint_with_reschedule: | |
511 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 512 | retint_check: |
1da177e4 LT |
513 | movl threadinfo_flags(%rcx),%edx |
514 | andl %edi,%edx | |
7effaa88 | 515 | CFI_REMEMBER_STATE |
1da177e4 LT |
516 | jnz retint_careful |
517 | retint_swapgs: | |
1da177e4 LT |
518 | swapgs |
519 | retint_restore_args: | |
520 | cli | |
521 | RESTORE_ARGS 0,8,0 | |
522 | iret_label: | |
523 | iretq | |
524 | ||
525 | .section __ex_table,"a" | |
526 | .quad iret_label,bad_iret | |
527 | .previous | |
528 | .section .fixup,"ax" | |
529 | /* force a signal here? this matches i386 behaviour */ | |
530 | /* running with kernel gs */ | |
531 | bad_iret: | |
3076a492 | 532 | movq $11,%rdi /* SIGSEGV */ |
2391c4b5 | 533 | sti |
1da177e4 LT |
534 | jmp do_exit |
535 | .previous | |
536 | ||
7effaa88 | 537 | /* edi: workmask, edx: work */ |
1da177e4 | 538 | retint_careful: |
7effaa88 | 539 | CFI_RESTORE_STATE |
1da177e4 LT |
540 | bt $TIF_NEED_RESCHED,%edx |
541 | jnc retint_signal | |
542 | sti | |
543 | pushq %rdi | |
7effaa88 | 544 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
545 | call schedule |
546 | popq %rdi | |
7effaa88 | 547 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
548 | GET_THREAD_INFO(%rcx) |
549 | cli | |
550 | jmp retint_check | |
551 | ||
552 | retint_signal: | |
10ffdbb8 AK |
553 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
554 | jz retint_swapgs | |
1da177e4 LT |
555 | sti |
556 | SAVE_REST | |
557 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 558 | xorl %esi,%esi # oldset |
1da177e4 LT |
559 | movq %rsp,%rdi # &pt_regs |
560 | call do_notify_resume | |
561 | RESTORE_REST | |
562 | cli | |
10ffdbb8 | 563 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 564 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
565 | jmp retint_check |
566 | ||
567 | #ifdef CONFIG_PREEMPT | |
568 | /* Returning to kernel space. Check if we need preemption */ | |
569 | /* rcx: threadinfo. interrupts off. */ | |
570 | .p2align | |
571 | retint_kernel: | |
572 | cmpl $0,threadinfo_preempt_count(%rcx) | |
573 | jnz retint_restore_args | |
574 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
575 | jnc retint_restore_args | |
576 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
577 | jnc retint_restore_args | |
578 | call preempt_schedule_irq | |
579 | jmp exit_intr | |
580 | #endif | |
4b787e0b | 581 | |
1da177e4 | 582 | CFI_ENDPROC |
4b787e0b | 583 | END(common_interrupt) |
1da177e4 LT |
584 | |
585 | /* | |
586 | * APIC interrupts. | |
587 | */ | |
588 | .macro apicinterrupt num,func | |
7effaa88 | 589 | INTR_FRAME |
19eadf98 | 590 | pushq $~(\num) |
7effaa88 | 591 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
592 | interrupt \func |
593 | jmp ret_from_intr | |
594 | CFI_ENDPROC | |
595 | .endm | |
596 | ||
597 | ENTRY(thermal_interrupt) | |
598 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 599 | END(thermal_interrupt) |
1da177e4 | 600 | |
89b831ef JS |
601 | ENTRY(threshold_interrupt) |
602 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 603 | END(threshold_interrupt) |
89b831ef | 604 | |
1da177e4 LT |
605 | #ifdef CONFIG_SMP |
606 | ENTRY(reschedule_interrupt) | |
607 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 608 | END(reschedule_interrupt) |
1da177e4 | 609 | |
e5bc8b6b AK |
610 | .macro INVALIDATE_ENTRY num |
611 | ENTRY(invalidate_interrupt\num) | |
612 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
4b787e0b | 613 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
614 | .endm |
615 | ||
616 | INVALIDATE_ENTRY 0 | |
617 | INVALIDATE_ENTRY 1 | |
618 | INVALIDATE_ENTRY 2 | |
619 | INVALIDATE_ENTRY 3 | |
620 | INVALIDATE_ENTRY 4 | |
621 | INVALIDATE_ENTRY 5 | |
622 | INVALIDATE_ENTRY 6 | |
623 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
624 | |
625 | ENTRY(call_function_interrupt) | |
626 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 627 | END(call_function_interrupt) |
1da177e4 LT |
628 | #endif |
629 | ||
630 | #ifdef CONFIG_X86_LOCAL_APIC | |
631 | ENTRY(apic_timer_interrupt) | |
632 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 633 | END(apic_timer_interrupt) |
1da177e4 LT |
634 | |
635 | ENTRY(error_interrupt) | |
636 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 637 | END(error_interrupt) |
1da177e4 LT |
638 | |
639 | ENTRY(spurious_interrupt) | |
640 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 641 | END(spurious_interrupt) |
1da177e4 LT |
642 | #endif |
643 | ||
644 | /* | |
645 | * Exception entry points. | |
646 | */ | |
647 | .macro zeroentry sym | |
7effaa88 | 648 | INTR_FRAME |
1da177e4 | 649 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 650 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 651 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 652 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
653 | leaq \sym(%rip),%rax |
654 | jmp error_entry | |
7effaa88 | 655 | CFI_ENDPROC |
1da177e4 LT |
656 | .endm |
657 | ||
658 | .macro errorentry sym | |
7effaa88 | 659 | XCPT_FRAME |
1da177e4 | 660 | pushq %rax |
7effaa88 | 661 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
662 | leaq \sym(%rip),%rax |
663 | jmp error_entry | |
7effaa88 | 664 | CFI_ENDPROC |
1da177e4 LT |
665 | .endm |
666 | ||
667 | /* error code is on the stack already */ | |
668 | /* handle NMI like exceptions that can happen everywhere */ | |
b556b35e | 669 | .macro paranoidentry sym, ist=0 |
1da177e4 LT |
670 | SAVE_ALL |
671 | cld | |
672 | movl $1,%ebx | |
673 | movl $MSR_GS_BASE,%ecx | |
674 | rdmsr | |
675 | testl %edx,%edx | |
676 | js 1f | |
677 | swapgs | |
678 | xorl %ebx,%ebx | |
b556b35e JB |
679 | 1: |
680 | .if \ist | |
681 | movq %gs:pda_data_offset, %rbp | |
682 | .endif | |
683 | movq %rsp,%rdi | |
1da177e4 LT |
684 | movq ORIG_RAX(%rsp),%rsi |
685 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 686 | .if \ist |
5f8efbb9 | 687 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 688 | .endif |
1da177e4 | 689 | call \sym |
b556b35e | 690 | .if \ist |
5f8efbb9 | 691 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 692 | .endif |
6fefb0d1 | 693 | cli |
1da177e4 LT |
694 | .endm |
695 | ||
696 | /* | |
697 | * Exception entry point. This expects an error code/orig_rax on the stack | |
698 | * and the exception handler in %rax. | |
699 | */ | |
700 | ENTRY(error_entry) | |
7effaa88 | 701 | _frame RDI |
1da177e4 LT |
702 | /* rdi slot contains rax, oldrax contains error code */ |
703 | cld | |
704 | subq $14*8,%rsp | |
705 | CFI_ADJUST_CFA_OFFSET (14*8) | |
706 | movq %rsi,13*8(%rsp) | |
707 | CFI_REL_OFFSET rsi,RSI | |
708 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
709 | movq %rdx,12*8(%rsp) | |
710 | CFI_REL_OFFSET rdx,RDX | |
711 | movq %rcx,11*8(%rsp) | |
712 | CFI_REL_OFFSET rcx,RCX | |
713 | movq %rsi,10*8(%rsp) /* store rax */ | |
714 | CFI_REL_OFFSET rax,RAX | |
715 | movq %r8, 9*8(%rsp) | |
716 | CFI_REL_OFFSET r8,R8 | |
717 | movq %r9, 8*8(%rsp) | |
718 | CFI_REL_OFFSET r9,R9 | |
719 | movq %r10,7*8(%rsp) | |
720 | CFI_REL_OFFSET r10,R10 | |
721 | movq %r11,6*8(%rsp) | |
722 | CFI_REL_OFFSET r11,R11 | |
723 | movq %rbx,5*8(%rsp) | |
724 | CFI_REL_OFFSET rbx,RBX | |
725 | movq %rbp,4*8(%rsp) | |
726 | CFI_REL_OFFSET rbp,RBP | |
727 | movq %r12,3*8(%rsp) | |
728 | CFI_REL_OFFSET r12,R12 | |
729 | movq %r13,2*8(%rsp) | |
730 | CFI_REL_OFFSET r13,R13 | |
731 | movq %r14,1*8(%rsp) | |
732 | CFI_REL_OFFSET r14,R14 | |
733 | movq %r15,(%rsp) | |
734 | CFI_REL_OFFSET r15,R15 | |
735 | xorl %ebx,%ebx | |
736 | testl $3,CS(%rsp) | |
737 | je error_kernelspace | |
738 | error_swapgs: | |
739 | swapgs | |
740 | error_sti: | |
741 | movq %rdi,RDI(%rsp) | |
742 | movq %rsp,%rdi | |
743 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
744 | movq $-1,ORIG_RAX(%rsp) | |
745 | call *%rax | |
746 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
747 | error_exit: | |
748 | movl %ebx,%eax | |
749 | RESTORE_REST | |
750 | cli | |
751 | GET_THREAD_INFO(%rcx) | |
752 | testl %eax,%eax | |
753 | jne retint_kernel | |
754 | movl threadinfo_flags(%rcx),%edx | |
755 | movl $_TIF_WORK_MASK,%edi | |
756 | andl %edi,%edx | |
757 | jnz retint_careful | |
758 | swapgs | |
759 | RESTORE_ARGS 0,8,0 | |
505cc4e1 | 760 | jmp iret_label |
1da177e4 LT |
761 | CFI_ENDPROC |
762 | ||
763 | error_kernelspace: | |
764 | incl %ebx | |
765 | /* There are two places in the kernel that can potentially fault with | |
766 | usergs. Handle them here. The exception handlers after | |
767 | iret run with kernel gs again, so don't set the user space flag. | |
768 | B stepping K8s sometimes report an truncated RIP for IRET | |
769 | exceptions returning to compat mode. Check for these here too. */ | |
770 | leaq iret_label(%rip),%rbp | |
771 | cmpq %rbp,RIP(%rsp) | |
772 | je error_swapgs | |
773 | movl %ebp,%ebp /* zero extend */ | |
774 | cmpq %rbp,RIP(%rsp) | |
775 | je error_swapgs | |
776 | cmpq $gs_change,RIP(%rsp) | |
777 | je error_swapgs | |
778 | jmp error_sti | |
4b787e0b | 779 | END(error_entry) |
1da177e4 LT |
780 | |
781 | /* Reload gs selector with exception handling */ | |
782 | /* edi: new selector */ | |
783 | ENTRY(load_gs_index) | |
7effaa88 | 784 | CFI_STARTPROC |
1da177e4 | 785 | pushf |
7effaa88 | 786 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
787 | cli |
788 | swapgs | |
789 | gs_change: | |
790 | movl %edi,%gs | |
791 | 2: mfence /* workaround */ | |
792 | swapgs | |
793 | popf | |
7effaa88 | 794 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 795 | ret |
7effaa88 | 796 | CFI_ENDPROC |
4b787e0b | 797 | ENDPROC(load_gs_index) |
1da177e4 LT |
798 | |
799 | .section __ex_table,"a" | |
800 | .align 8 | |
801 | .quad gs_change,bad_gs | |
802 | .previous | |
803 | .section .fixup,"ax" | |
804 | /* running with kernelgs */ | |
805 | bad_gs: | |
806 | swapgs /* switch back to user gs */ | |
807 | xorl %eax,%eax | |
808 | movl %eax,%gs | |
809 | jmp 2b | |
810 | .previous | |
811 | ||
812 | /* | |
813 | * Create a kernel thread. | |
814 | * | |
815 | * C extern interface: | |
816 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
817 | * | |
818 | * asm input arguments: | |
819 | * rdi: fn, rsi: arg, rdx: flags | |
820 | */ | |
821 | ENTRY(kernel_thread) | |
822 | CFI_STARTPROC | |
823 | FAKE_STACK_FRAME $child_rip | |
824 | SAVE_ALL | |
825 | ||
826 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
827 | movq %rdx,%rdi | |
828 | orq kernel_thread_flags(%rip),%rdi | |
829 | movq $-1, %rsi | |
830 | movq %rsp, %rdx | |
831 | ||
832 | xorl %r8d,%r8d | |
833 | xorl %r9d,%r9d | |
834 | ||
835 | # clone now | |
836 | call do_fork | |
837 | movq %rax,RAX(%rsp) | |
838 | xorl %edi,%edi | |
839 | ||
840 | /* | |
841 | * It isn't worth to check for reschedule here, | |
842 | * so internally to the x86_64 port you can rely on kernel_thread() | |
843 | * not to reschedule the child before returning, this avoids the need | |
844 | * of hacks for example to fork off the per-CPU idle tasks. | |
845 | * [Hopefully no generic code relies on the reschedule -AK] | |
846 | */ | |
847 | RESTORE_ALL | |
848 | UNFAKE_STACK_FRAME | |
849 | ret | |
850 | CFI_ENDPROC | |
4b787e0b | 851 | ENDPROC(kernel_thread) |
1da177e4 LT |
852 | |
853 | child_rip: | |
854 | /* | |
855 | * Here we are in the child and the registers are set as they were | |
856 | * at kernel_thread() invocation in the parent. | |
857 | */ | |
858 | movq %rdi, %rax | |
859 | movq %rsi, %rdi | |
860 | call *%rax | |
861 | # exit | |
3829ee6b | 862 | xorl %edi, %edi |
1da177e4 | 863 | call do_exit |
4b787e0b | 864 | ENDPROC(child_rip) |
1da177e4 LT |
865 | |
866 | /* | |
867 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
868 | * | |
869 | * C extern interface: | |
870 | * extern long execve(char *name, char **argv, char **envp) | |
871 | * | |
872 | * asm input arguments: | |
873 | * rdi: name, rsi: argv, rdx: envp | |
874 | * | |
875 | * We want to fallback into: | |
876 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
877 | * | |
878 | * do_sys_execve asm fallback arguments: | |
879 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
880 | */ | |
881 | ENTRY(execve) | |
882 | CFI_STARTPROC | |
883 | FAKE_STACK_FRAME $0 | |
884 | SAVE_ALL | |
885 | call sys_execve | |
886 | movq %rax, RAX(%rsp) | |
887 | RESTORE_REST | |
888 | testq %rax,%rax | |
889 | je int_ret_from_sys_call | |
890 | RESTORE_ARGS | |
891 | UNFAKE_STACK_FRAME | |
892 | ret | |
893 | CFI_ENDPROC | |
4b787e0b | 894 | ENDPROC(execve) |
1da177e4 | 895 | |
0f2fbdcb | 896 | KPROBE_ENTRY(page_fault) |
1da177e4 | 897 | errorentry do_page_fault |
4b787e0b | 898 | END(page_fault) |
0f2fbdcb | 899 | .previous .text |
1da177e4 LT |
900 | |
901 | ENTRY(coprocessor_error) | |
902 | zeroentry do_coprocessor_error | |
4b787e0b | 903 | END(coprocessor_error) |
1da177e4 LT |
904 | |
905 | ENTRY(simd_coprocessor_error) | |
906 | zeroentry do_simd_coprocessor_error | |
4b787e0b | 907 | END(simd_coprocessor_error) |
1da177e4 LT |
908 | |
909 | ENTRY(device_not_available) | |
910 | zeroentry math_state_restore | |
4b787e0b | 911 | END(device_not_available) |
1da177e4 LT |
912 | |
913 | /* runs on exception stack */ | |
0f2fbdcb | 914 | KPROBE_ENTRY(debug) |
7effaa88 | 915 | INTR_FRAME |
1da177e4 LT |
916 | pushq $0 |
917 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 918 | paranoidentry do_debug, DEBUG_STACK |
1da177e4 LT |
919 | jmp paranoid_exit |
920 | CFI_ENDPROC | |
4b787e0b | 921 | END(debug) |
0f2fbdcb | 922 | .previous .text |
1da177e4 LT |
923 | |
924 | /* runs on exception stack */ | |
eddb6fb9 | 925 | KPROBE_ENTRY(nmi) |
7effaa88 | 926 | INTR_FRAME |
1da177e4 | 927 | pushq $-1 |
7effaa88 | 928 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 929 | paranoidentry do_nmi |
6fefb0d1 AK |
930 | /* |
931 | * "Paranoid" exit path from exception stack. | |
932 | * Paranoid because this is used by NMIs and cannot take | |
933 | * any kernel state for granted. | |
934 | * We don't do kernel preemption checks here, because only | |
935 | * NMI should be common and it does not enable IRQs and | |
936 | * cannot get reschedule ticks. | |
937 | */ | |
1da177e4 LT |
938 | /* ebx: no swapgs flag */ |
939 | paranoid_exit: | |
940 | testl %ebx,%ebx /* swapgs needed? */ | |
941 | jnz paranoid_restore | |
6fefb0d1 AK |
942 | testl $3,CS(%rsp) |
943 | jnz paranoid_userspace | |
1da177e4 | 944 | paranoid_swapgs: |
1da177e4 LT |
945 | swapgs |
946 | paranoid_restore: | |
947 | RESTORE_ALL 8 | |
948 | iretq | |
949 | paranoid_userspace: | |
1da177e4 | 950 | GET_THREAD_INFO(%rcx) |
6fefb0d1 AK |
951 | movl threadinfo_flags(%rcx),%ebx |
952 | andl $_TIF_WORK_MASK,%ebx | |
11b854b2 | 953 | jz paranoid_swapgs |
6fefb0d1 AK |
954 | movq %rsp,%rdi /* &pt_regs */ |
955 | call sync_regs | |
956 | movq %rax,%rsp /* switch stack for scheduling */ | |
957 | testl $_TIF_NEED_RESCHED,%ebx | |
958 | jnz paranoid_schedule | |
959 | movl %ebx,%edx /* arg3: thread flags */ | |
1da177e4 | 960 | sti |
6fefb0d1 AK |
961 | xorl %esi,%esi /* arg2: oldset */ |
962 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1da177e4 | 963 | call do_notify_resume |
6fefb0d1 AK |
964 | cli |
965 | jmp paranoid_userspace | |
966 | paranoid_schedule: | |
11b854b2 AK |
967 | sti |
968 | call schedule | |
6fefb0d1 AK |
969 | cli |
970 | jmp paranoid_userspace | |
1da177e4 | 971 | CFI_ENDPROC |
4b787e0b | 972 | END(nmi) |
eddb6fb9 | 973 | .previous .text |
6fefb0d1 | 974 | |
0f2fbdcb | 975 | KPROBE_ENTRY(int3) |
b556b35e JB |
976 | INTR_FRAME |
977 | pushq $0 | |
978 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 979 | paranoidentry do_int3, DEBUG_STACK |
b556b35e JB |
980 | jmp paranoid_exit |
981 | CFI_ENDPROC | |
4b787e0b | 982 | END(int3) |
0f2fbdcb | 983 | .previous .text |
1da177e4 LT |
984 | |
985 | ENTRY(overflow) | |
986 | zeroentry do_overflow | |
4b787e0b | 987 | END(overflow) |
1da177e4 LT |
988 | |
989 | ENTRY(bounds) | |
990 | zeroentry do_bounds | |
4b787e0b | 991 | END(bounds) |
1da177e4 LT |
992 | |
993 | ENTRY(invalid_op) | |
994 | zeroentry do_invalid_op | |
4b787e0b | 995 | END(invalid_op) |
1da177e4 LT |
996 | |
997 | ENTRY(coprocessor_segment_overrun) | |
998 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 999 | END(coprocessor_segment_overrun) |
1da177e4 LT |
1000 | |
1001 | ENTRY(reserved) | |
1002 | zeroentry do_reserved | |
4b787e0b | 1003 | END(reserved) |
1da177e4 LT |
1004 | |
1005 | /* runs on exception stack */ | |
1006 | ENTRY(double_fault) | |
7effaa88 | 1007 | XCPT_FRAME |
1da177e4 | 1008 | paranoidentry do_double_fault |
1da177e4 LT |
1009 | jmp paranoid_exit |
1010 | CFI_ENDPROC | |
4b787e0b | 1011 | END(double_fault) |
1da177e4 LT |
1012 | |
1013 | ENTRY(invalid_TSS) | |
1014 | errorentry do_invalid_TSS | |
4b787e0b | 1015 | END(invalid_TSS) |
1da177e4 LT |
1016 | |
1017 | ENTRY(segment_not_present) | |
1018 | errorentry do_segment_not_present | |
4b787e0b | 1019 | END(segment_not_present) |
1da177e4 LT |
1020 | |
1021 | /* runs on exception stack */ | |
1022 | ENTRY(stack_segment) | |
7effaa88 | 1023 | XCPT_FRAME |
1da177e4 | 1024 | paranoidentry do_stack_segment |
1da177e4 LT |
1025 | jmp paranoid_exit |
1026 | CFI_ENDPROC | |
4b787e0b | 1027 | END(stack_segment) |
1da177e4 | 1028 | |
0f2fbdcb | 1029 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1030 | errorentry do_general_protection |
4b787e0b | 1031 | END(general_protection) |
0f2fbdcb | 1032 | .previous .text |
1da177e4 LT |
1033 | |
1034 | ENTRY(alignment_check) | |
1035 | errorentry do_alignment_check | |
4b787e0b | 1036 | END(alignment_check) |
1da177e4 LT |
1037 | |
1038 | ENTRY(divide_error) | |
1039 | zeroentry do_divide_error | |
4b787e0b | 1040 | END(divide_error) |
1da177e4 LT |
1041 | |
1042 | ENTRY(spurious_interrupt_bug) | |
1043 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1044 | END(spurious_interrupt_bug) |
1da177e4 LT |
1045 | |
1046 | #ifdef CONFIG_X86_MCE | |
1047 | /* runs on exception stack */ | |
1048 | ENTRY(machine_check) | |
7effaa88 | 1049 | INTR_FRAME |
1da177e4 LT |
1050 | pushq $0 |
1051 | CFI_ADJUST_CFA_OFFSET 8 | |
1052 | paranoidentry do_machine_check | |
1053 | jmp paranoid_exit | |
1054 | CFI_ENDPROC | |
4b787e0b | 1055 | END(machine_check) |
1da177e4 LT |
1056 | #endif |
1057 | ||
ed6b676c | 1058 | ENTRY(call_softirq) |
7effaa88 | 1059 | CFI_STARTPROC |
ed6b676c | 1060 | movq %gs:pda_irqstackptr,%rax |
bd9cb64d JB |
1061 | movq %rsp,%rdx |
1062 | CFI_DEF_CFA_REGISTER rdx | |
ed6b676c AK |
1063 | incl %gs:pda_irqcount |
1064 | cmove %rax,%rsp | |
bd9cb64d JB |
1065 | pushq %rdx |
1066 | /*todo CFI_DEF_CFA_EXPRESSION ...*/ | |
ed6b676c | 1067 | call __do_softirq |
bd9cb64d | 1068 | popq %rsp |
7effaa88 | 1069 | CFI_DEF_CFA_REGISTER rsp |
ed6b676c | 1070 | decl %gs:pda_irqcount |
ed6b676c | 1071 | ret |
7effaa88 | 1072 | CFI_ENDPROC |
4b787e0b | 1073 | ENDPROC(call_softirq) |
b538ed27 JB |
1074 | |
1075 | #ifdef CONFIG_STACK_UNWIND | |
1076 | ENTRY(arch_unwind_init_running) | |
1077 | CFI_STARTPROC | |
1078 | movq %r15, R15(%rdi) | |
1079 | movq %r14, R14(%rdi) | |
1080 | xchgq %rsi, %rdx | |
1081 | movq %r13, R13(%rdi) | |
1082 | movq %r12, R12(%rdi) | |
1083 | xorl %eax, %eax | |
1084 | movq %rbp, RBP(%rdi) | |
1085 | movq %rbx, RBX(%rdi) | |
1086 | movq (%rsp), %rcx | |
1087 | movq %rax, R11(%rdi) | |
1088 | movq %rax, R10(%rdi) | |
1089 | movq %rax, R9(%rdi) | |
1090 | movq %rax, R8(%rdi) | |
1091 | movq %rax, RAX(%rdi) | |
1092 | movq %rax, RCX(%rdi) | |
1093 | movq %rax, RDX(%rdi) | |
1094 | movq %rax, RSI(%rdi) | |
1095 | movq %rax, RDI(%rdi) | |
1096 | movq %rax, ORIG_RAX(%rdi) | |
1097 | movq %rcx, RIP(%rdi) | |
1098 | leaq 8(%rsp), %rcx | |
1099 | movq $__KERNEL_CS, CS(%rdi) | |
1100 | movq %rax, EFLAGS(%rdi) | |
1101 | movq %rcx, RSP(%rdi) | |
1102 | movq $__KERNEL_DS, SS(%rdi) | |
1103 | jmpq *%rdx | |
1104 | CFI_ENDPROC | |
1105 | ENDPROC(arch_unwind_init_running) | |
1106 | #endif |