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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> | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* | |
10 | * entry.S contains the system-call and fault low-level handling routines. | |
11 | * | |
12 | * NOTE: This code handles signal-recognition, which happens every time | |
13 | * after an interrupt and after each system call. | |
14 | * | |
15 | * Normal syscalls and interrupts don't save a full stack frame, this is | |
16 | * only done for syscall tracing, signals or fork/exec et.al. | |
17 | * | |
18 | * A note on terminology: | |
19 | * - top of stack: Architecture defined interrupt frame from SS to RIP | |
20 | * at the top of the kernel process stack. | |
21 | * - partial stack frame: partially saved registers upto R11. | |
22 | * - full stack frame: Like partial stack frame, but all register saved. | |
2e91a17b AK |
23 | * |
24 | * Some macro usage: | |
25 | * - CFI macros are used to generate dwarf2 unwind information for better | |
26 | * backtraces. They don't change any code. | |
27 | * - SAVE_ALL/RESTORE_ALL - Save/restore all registers | |
28 | * - SAVE_ARGS/RESTORE_ARGS - Save/restore registers that C functions modify. | |
29 | * There are unfortunately lots of special cases where some registers | |
30 | * not touched. The macro is a big mess that should be cleaned up. | |
31 | * - SAVE_REST/RESTORE_REST - Handle the registers not saved by SAVE_ARGS. | |
32 | * Gives a full stack frame. | |
33 | * - ENTRY/END Define functions in the symbol table. | |
34 | * - FIXUP_TOP_OF_STACK/RESTORE_TOP_OF_STACK - Fix up the hardware stack | |
35 | * frame that is otherwise undefined after a SYSCALL | |
36 | * - TRACE_IRQ_* - Trace hard interrupt state for lock debugging. | |
37 | * - errorentry/paranoidentry/zeroentry - Define exception entry points. | |
1da177e4 LT |
38 | */ |
39 | ||
1da177e4 LT |
40 | #include <linux/linkage.h> |
41 | #include <asm/segment.h> | |
1da177e4 LT |
42 | #include <asm/cache.h> |
43 | #include <asm/errno.h> | |
44 | #include <asm/dwarf2.h> | |
45 | #include <asm/calling.h> | |
e2d5df93 | 46 | #include <asm/asm-offsets.h> |
1da177e4 LT |
47 | #include <asm/msr.h> |
48 | #include <asm/unistd.h> | |
49 | #include <asm/thread_info.h> | |
50 | #include <asm/hw_irq.h> | |
5f8efbb9 | 51 | #include <asm/page.h> |
2601e64d | 52 | #include <asm/irqflags.h> |
1da177e4 LT |
53 | |
54 | .code64 | |
55 | ||
dc37db4d | 56 | #ifndef CONFIG_PREEMPT |
1da177e4 LT |
57 | #define retint_kernel retint_restore_args |
58 | #endif | |
2601e64d IM |
59 | |
60 | ||
61 | .macro TRACE_IRQS_IRETQ offset=ARGOFFSET | |
62 | #ifdef CONFIG_TRACE_IRQFLAGS | |
63 | bt $9,EFLAGS-\offset(%rsp) /* interrupts off? */ | |
64 | jnc 1f | |
65 | TRACE_IRQS_ON | |
66 | 1: | |
67 | #endif | |
68 | .endm | |
69 | ||
1da177e4 LT |
70 | /* |
71 | * C code is not supposed to know about undefined top of stack. Every time | |
72 | * a C function with an pt_regs argument is called from the SYSCALL based | |
73 | * fast path FIXUP_TOP_OF_STACK is needed. | |
74 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs | |
75 | * manipulation. | |
76 | */ | |
77 | ||
78 | /* %rsp:at FRAMEEND */ | |
79 | .macro FIXUP_TOP_OF_STACK tmp | |
80 | movq %gs:pda_oldrsp,\tmp | |
81 | movq \tmp,RSP(%rsp) | |
82 | movq $__USER_DS,SS(%rsp) | |
83 | movq $__USER_CS,CS(%rsp) | |
84 | movq $-1,RCX(%rsp) | |
85 | movq R11(%rsp),\tmp /* get eflags */ | |
86 | movq \tmp,EFLAGS(%rsp) | |
87 | .endm | |
88 | ||
89 | .macro RESTORE_TOP_OF_STACK tmp,offset=0 | |
90 | movq RSP-\offset(%rsp),\tmp | |
91 | movq \tmp,%gs:pda_oldrsp | |
92 | movq EFLAGS-\offset(%rsp),\tmp | |
93 | movq \tmp,R11-\offset(%rsp) | |
94 | .endm | |
95 | ||
96 | .macro FAKE_STACK_FRAME child_rip | |
97 | /* push in order ss, rsp, eflags, cs, rip */ | |
3829ee6b | 98 | xorl %eax, %eax |
1da177e4 LT |
99 | pushq %rax /* ss */ |
100 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 101 | /*CFI_REL_OFFSET ss,0*/ |
1da177e4 LT |
102 | pushq %rax /* rsp */ |
103 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 104 | CFI_REL_OFFSET rsp,0 |
1da177e4 LT |
105 | pushq $(1<<9) /* eflags - interrupts on */ |
106 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 107 | /*CFI_REL_OFFSET rflags,0*/ |
1da177e4 LT |
108 | pushq $__KERNEL_CS /* cs */ |
109 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 110 | /*CFI_REL_OFFSET cs,0*/ |
1da177e4 LT |
111 | pushq \child_rip /* rip */ |
112 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 113 | CFI_REL_OFFSET rip,0 |
1da177e4 LT |
114 | pushq %rax /* orig rax */ |
115 | CFI_ADJUST_CFA_OFFSET 8 | |
116 | .endm | |
117 | ||
118 | .macro UNFAKE_STACK_FRAME | |
119 | addq $8*6, %rsp | |
120 | CFI_ADJUST_CFA_OFFSET -(6*8) | |
121 | .endm | |
122 | ||
7effaa88 JB |
123 | .macro CFI_DEFAULT_STACK start=1 |
124 | .if \start | |
125 | CFI_STARTPROC simple | |
adf14236 | 126 | CFI_SIGNAL_FRAME |
7effaa88 JB |
127 | CFI_DEF_CFA rsp,SS+8 |
128 | .else | |
129 | CFI_DEF_CFA_OFFSET SS+8 | |
130 | .endif | |
131 | CFI_REL_OFFSET r15,R15 | |
132 | CFI_REL_OFFSET r14,R14 | |
133 | CFI_REL_OFFSET r13,R13 | |
134 | CFI_REL_OFFSET r12,R12 | |
135 | CFI_REL_OFFSET rbp,RBP | |
136 | CFI_REL_OFFSET rbx,RBX | |
137 | CFI_REL_OFFSET r11,R11 | |
138 | CFI_REL_OFFSET r10,R10 | |
139 | CFI_REL_OFFSET r9,R9 | |
140 | CFI_REL_OFFSET r8,R8 | |
141 | CFI_REL_OFFSET rax,RAX | |
142 | CFI_REL_OFFSET rcx,RCX | |
143 | CFI_REL_OFFSET rdx,RDX | |
144 | CFI_REL_OFFSET rsi,RSI | |
145 | CFI_REL_OFFSET rdi,RDI | |
146 | CFI_REL_OFFSET rip,RIP | |
147 | /*CFI_REL_OFFSET cs,CS*/ | |
148 | /*CFI_REL_OFFSET rflags,EFLAGS*/ | |
149 | CFI_REL_OFFSET rsp,RSP | |
150 | /*CFI_REL_OFFSET ss,SS*/ | |
1da177e4 LT |
151 | .endm |
152 | /* | |
153 | * A newly forked process directly context switches into this. | |
154 | */ | |
155 | /* rdi: prev */ | |
156 | ENTRY(ret_from_fork) | |
1da177e4 | 157 | CFI_DEFAULT_STACK |
658fdbef AK |
158 | push kernel_eflags(%rip) |
159 | CFI_ADJUST_CFA_OFFSET 4 | |
160 | popf # reset kernel eflags | |
161 | CFI_ADJUST_CFA_OFFSET -4 | |
1da177e4 LT |
162 | call schedule_tail |
163 | GET_THREAD_INFO(%rcx) | |
164 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx) | |
165 | jnz rff_trace | |
166 | rff_action: | |
167 | RESTORE_REST | |
168 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? | |
169 | je int_ret_from_sys_call | |
170 | testl $_TIF_IA32,threadinfo_flags(%rcx) | |
171 | jnz int_ret_from_sys_call | |
172 | RESTORE_TOP_OF_STACK %rdi,ARGOFFSET | |
173 | jmp ret_from_sys_call | |
174 | rff_trace: | |
175 | movq %rsp,%rdi | |
176 | call syscall_trace_leave | |
177 | GET_THREAD_INFO(%rcx) | |
178 | jmp rff_action | |
179 | CFI_ENDPROC | |
4b787e0b | 180 | END(ret_from_fork) |
1da177e4 LT |
181 | |
182 | /* | |
183 | * System call entry. Upto 6 arguments in registers are supported. | |
184 | * | |
185 | * SYSCALL does not save anything on the stack and does not change the | |
186 | * stack pointer. | |
187 | */ | |
188 | ||
189 | /* | |
190 | * Register setup: | |
191 | * rax system call number | |
192 | * rdi arg0 | |
193 | * rcx return address for syscall/sysret, C arg3 | |
194 | * rsi arg1 | |
195 | * rdx arg2 | |
196 | * r10 arg3 (--> moved to rcx for C) | |
197 | * r8 arg4 | |
198 | * r9 arg5 | |
199 | * r11 eflags for syscall/sysret, temporary for C | |
200 | * r12-r15,rbp,rbx saved by C code, not touched. | |
201 | * | |
202 | * Interrupts are off on entry. | |
203 | * Only called from user space. | |
204 | * | |
205 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
206 | * and report it properly in ps. Unfortunately we haven't. | |
7bf36bbc AK |
207 | * |
208 | * When user can change the frames always force IRET. That is because | |
209 | * it deals with uncanonical addresses better. SYSRET has trouble | |
210 | * with them due to bugs in both AMD and Intel CPUs. | |
1da177e4 LT |
211 | */ |
212 | ||
213 | ENTRY(system_call) | |
7effaa88 | 214 | CFI_STARTPROC simple |
adf14236 | 215 | CFI_SIGNAL_FRAME |
dffead4e | 216 | CFI_DEF_CFA rsp,PDA_STACKOFFSET |
7effaa88 JB |
217 | CFI_REGISTER rip,rcx |
218 | /*CFI_REGISTER rflags,r11*/ | |
1da177e4 LT |
219 | swapgs |
220 | movq %rsp,%gs:pda_oldrsp | |
221 | movq %gs:pda_kernelstack,%rsp | |
2601e64d IM |
222 | /* |
223 | * No need to follow this irqs off/on section - it's straight | |
224 | * and short: | |
225 | */ | |
1da177e4 LT |
226 | sti |
227 | SAVE_ARGS 8,1 | |
228 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) | |
7effaa88 JB |
229 | movq %rcx,RIP-ARGOFFSET(%rsp) |
230 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 LT |
231 | GET_THREAD_INFO(%rcx) |
232 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx) | |
7effaa88 | 233 | CFI_REMEMBER_STATE |
1da177e4 LT |
234 | jnz tracesys |
235 | cmpq $__NR_syscall_max,%rax | |
236 | ja badsys | |
237 | movq %r10,%rcx | |
238 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
239 | movq %rax,RAX-ARGOFFSET(%rsp) | |
240 | /* | |
241 | * Syscall return path ending with SYSRET (fast path) | |
242 | * Has incomplete stack frame and undefined top of stack. | |
243 | */ | |
244 | .globl ret_from_sys_call | |
245 | ret_from_sys_call: | |
11b854b2 | 246 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 LT |
247 | /* edi: flagmask */ |
248 | sysret_check: | |
249 | GET_THREAD_INFO(%rcx) | |
250 | cli | |
2601e64d | 251 | TRACE_IRQS_OFF |
1da177e4 LT |
252 | movl threadinfo_flags(%rcx),%edx |
253 | andl %edi,%edx | |
7effaa88 | 254 | CFI_REMEMBER_STATE |
1da177e4 | 255 | jnz sysret_careful |
2601e64d IM |
256 | /* |
257 | * sysretq will re-enable interrupts: | |
258 | */ | |
259 | TRACE_IRQS_ON | |
1da177e4 | 260 | movq RIP-ARGOFFSET(%rsp),%rcx |
7effaa88 | 261 | CFI_REGISTER rip,rcx |
1da177e4 | 262 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 263 | /*CFI_REGISTER rflags,r11*/ |
1da177e4 LT |
264 | movq %gs:pda_oldrsp,%rsp |
265 | swapgs | |
266 | sysretq | |
267 | ||
268 | /* Handle reschedules */ | |
269 | /* edx: work, edi: workmask */ | |
270 | sysret_careful: | |
7effaa88 | 271 | CFI_RESTORE_STATE |
1da177e4 LT |
272 | bt $TIF_NEED_RESCHED,%edx |
273 | jnc sysret_signal | |
2601e64d | 274 | TRACE_IRQS_ON |
1da177e4 LT |
275 | sti |
276 | pushq %rdi | |
7effaa88 | 277 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
278 | call schedule |
279 | popq %rdi | |
7effaa88 | 280 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
281 | jmp sysret_check |
282 | ||
283 | /* Handle a signal */ | |
284 | sysret_signal: | |
2601e64d | 285 | TRACE_IRQS_ON |
1da177e4 | 286 | sti |
10ffdbb8 AK |
287 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
288 | jz 1f | |
289 | ||
290 | /* Really a signal */ | |
291 | /* edx: work flags (arg3) */ | |
1da177e4 LT |
292 | leaq do_notify_resume(%rip),%rax |
293 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
294 | xorl %esi,%esi # oldset -> arg2 | |
295 | call ptregscall_common | |
10ffdbb8 | 296 | 1: movl $_TIF_NEED_RESCHED,%edi |
7bf36bbc AK |
297 | /* Use IRET because user could have changed frame. This |
298 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ | |
299 | cli | |
2601e64d | 300 | TRACE_IRQS_OFF |
7bf36bbc | 301 | jmp int_with_check |
1da177e4 | 302 | |
7effaa88 JB |
303 | badsys: |
304 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
305 | jmp ret_from_sys_call | |
306 | ||
1da177e4 LT |
307 | /* Do syscall tracing */ |
308 | tracesys: | |
7effaa88 | 309 | CFI_RESTORE_STATE |
1da177e4 LT |
310 | SAVE_REST |
311 | movq $-ENOSYS,RAX(%rsp) | |
312 | FIXUP_TOP_OF_STACK %rdi | |
313 | movq %rsp,%rdi | |
314 | call syscall_trace_enter | |
315 | LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */ | |
316 | RESTORE_REST | |
317 | cmpq $__NR_syscall_max,%rax | |
cc7d479f JB |
318 | movq $-ENOSYS,%rcx |
319 | cmova %rcx,%rax | |
1da177e4 LT |
320 | ja 1f |
321 | movq %r10,%rcx /* fixup for C */ | |
322 | call *sys_call_table(,%rax,8) | |
822ff019 | 323 | 1: movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc AK |
324 | /* Use IRET because user could have changed frame */ |
325 | jmp int_ret_from_sys_call | |
7effaa88 | 326 | CFI_ENDPROC |
4b787e0b | 327 | END(system_call) |
1da177e4 | 328 | |
1da177e4 LT |
329 | /* |
330 | * Syscall return path ending with IRET. | |
331 | * Has correct top of stack, but partial stack frame. | |
332 | */ | |
7effaa88 JB |
333 | ENTRY(int_ret_from_sys_call) |
334 | CFI_STARTPROC simple | |
adf14236 | 335 | CFI_SIGNAL_FRAME |
7effaa88 JB |
336 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET |
337 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
338 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
339 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
340 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
341 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
342 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
343 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
344 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
345 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
346 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
347 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
348 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
349 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
350 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 | 351 | cli |
2601e64d | 352 | TRACE_IRQS_OFF |
1da177e4 LT |
353 | testl $3,CS-ARGOFFSET(%rsp) |
354 | je retint_restore_args | |
355 | movl $_TIF_ALLWORK_MASK,%edi | |
356 | /* edi: mask to check */ | |
357 | int_with_check: | |
358 | GET_THREAD_INFO(%rcx) | |
359 | movl threadinfo_flags(%rcx),%edx | |
360 | andl %edi,%edx | |
361 | jnz int_careful | |
bf2fcc6f | 362 | andl $~TS_COMPAT,threadinfo_status(%rcx) |
1da177e4 LT |
363 | jmp retint_swapgs |
364 | ||
365 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
366 | /* First do a reschedule test. */ | |
367 | /* edx: work, edi: workmask */ | |
368 | int_careful: | |
369 | bt $TIF_NEED_RESCHED,%edx | |
370 | jnc int_very_careful | |
2601e64d | 371 | TRACE_IRQS_ON |
1da177e4 LT |
372 | sti |
373 | pushq %rdi | |
7effaa88 | 374 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
375 | call schedule |
376 | popq %rdi | |
7effaa88 | 377 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 378 | cli |
2601e64d | 379 | TRACE_IRQS_OFF |
1da177e4 LT |
380 | jmp int_with_check |
381 | ||
382 | /* handle signals and tracing -- both require a full stack frame */ | |
383 | int_very_careful: | |
2601e64d | 384 | TRACE_IRQS_ON |
1da177e4 LT |
385 | sti |
386 | SAVE_REST | |
387 | /* Check for syscall exit trace */ | |
388 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
389 | jz int_signal | |
390 | pushq %rdi | |
7effaa88 | 391 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
392 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
393 | call syscall_trace_leave | |
394 | popq %rdi | |
7effaa88 | 395 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 396 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 397 | cli |
2601e64d | 398 | TRACE_IRQS_OFF |
1da177e4 LT |
399 | jmp int_restore_rest |
400 | ||
401 | int_signal: | |
402 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
403 | jz 1f | |
404 | movq %rsp,%rdi # &ptregs -> arg1 | |
405 | xorl %esi,%esi # oldset -> arg2 | |
406 | call do_notify_resume | |
407 | 1: movl $_TIF_NEED_RESCHED,%edi | |
408 | int_restore_rest: | |
409 | RESTORE_REST | |
be9e6870 | 410 | cli |
2601e64d | 411 | TRACE_IRQS_OFF |
1da177e4 LT |
412 | jmp int_with_check |
413 | CFI_ENDPROC | |
4b787e0b | 414 | END(int_ret_from_sys_call) |
1da177e4 LT |
415 | |
416 | /* | |
417 | * Certain special system calls that need to save a complete full stack frame. | |
418 | */ | |
419 | ||
420 | .macro PTREGSCALL label,func,arg | |
421 | .globl \label | |
422 | \label: | |
423 | leaq \func(%rip),%rax | |
424 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
425 | jmp ptregscall_common | |
4b787e0b | 426 | END(\label) |
1da177e4 LT |
427 | .endm |
428 | ||
7effaa88 JB |
429 | CFI_STARTPROC |
430 | ||
1da177e4 LT |
431 | PTREGSCALL stub_clone, sys_clone, %r8 |
432 | PTREGSCALL stub_fork, sys_fork, %rdi | |
433 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
434 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
435 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
436 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
437 | ||
438 | ENTRY(ptregscall_common) | |
1da177e4 | 439 | popq %r11 |
7effaa88 JB |
440 | CFI_ADJUST_CFA_OFFSET -8 |
441 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
442 | SAVE_REST |
443 | movq %r11, %r15 | |
7effaa88 | 444 | CFI_REGISTER rip, r15 |
1da177e4 LT |
445 | FIXUP_TOP_OF_STACK %r11 |
446 | call *%rax | |
447 | RESTORE_TOP_OF_STACK %r11 | |
448 | movq %r15, %r11 | |
7effaa88 | 449 | CFI_REGISTER rip, r11 |
1da177e4 LT |
450 | RESTORE_REST |
451 | pushq %r11 | |
7effaa88 JB |
452 | CFI_ADJUST_CFA_OFFSET 8 |
453 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
454 | ret |
455 | CFI_ENDPROC | |
4b787e0b | 456 | END(ptregscall_common) |
1da177e4 LT |
457 | |
458 | ENTRY(stub_execve) | |
459 | CFI_STARTPROC | |
460 | popq %r11 | |
7effaa88 JB |
461 | CFI_ADJUST_CFA_OFFSET -8 |
462 | CFI_REGISTER rip, r11 | |
1da177e4 | 463 | SAVE_REST |
1da177e4 LT |
464 | FIXUP_TOP_OF_STACK %r11 |
465 | call sys_execve | |
1da177e4 | 466 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
467 | movq %rax,RAX(%rsp) |
468 | RESTORE_REST | |
469 | jmp int_ret_from_sys_call | |
470 | CFI_ENDPROC | |
4b787e0b | 471 | END(stub_execve) |
1da177e4 LT |
472 | |
473 | /* | |
474 | * sigreturn is special because it needs to restore all registers on return. | |
475 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
476 | */ | |
477 | ENTRY(stub_rt_sigreturn) | |
478 | CFI_STARTPROC | |
7effaa88 JB |
479 | addq $8, %rsp |
480 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
481 | SAVE_REST |
482 | movq %rsp,%rdi | |
483 | FIXUP_TOP_OF_STACK %r11 | |
484 | call sys_rt_sigreturn | |
485 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
486 | RESTORE_REST | |
487 | jmp int_ret_from_sys_call | |
488 | CFI_ENDPROC | |
4b787e0b | 489 | END(stub_rt_sigreturn) |
1da177e4 | 490 | |
7effaa88 JB |
491 | /* |
492 | * initial frame state for interrupts and exceptions | |
493 | */ | |
494 | .macro _frame ref | |
495 | CFI_STARTPROC simple | |
adf14236 | 496 | CFI_SIGNAL_FRAME |
7effaa88 JB |
497 | CFI_DEF_CFA rsp,SS+8-\ref |
498 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
499 | CFI_REL_OFFSET rsp,RSP-\ref | |
500 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
501 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
502 | CFI_REL_OFFSET rip,RIP-\ref | |
503 | .endm | |
504 | ||
505 | /* initial frame state for interrupts (and exceptions without error code) */ | |
506 | #define INTR_FRAME _frame RIP | |
507 | /* initial frame state for exceptions with error code (and interrupts with | |
508 | vector already pushed) */ | |
509 | #define XCPT_FRAME _frame ORIG_RAX | |
510 | ||
1da177e4 LT |
511 | /* |
512 | * Interrupt entry/exit. | |
513 | * | |
514 | * Interrupt entry points save only callee clobbered registers in fast path. | |
515 | * | |
516 | * Entry runs with interrupts off. | |
517 | */ | |
518 | ||
519 | /* 0(%rsp): interrupt number */ | |
520 | .macro interrupt func | |
1da177e4 | 521 | cld |
1da177e4 LT |
522 | SAVE_ARGS |
523 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
1de9c3f6 JB |
524 | pushq %rbp |
525 | CFI_ADJUST_CFA_OFFSET 8 | |
526 | CFI_REL_OFFSET rbp, 0 | |
527 | movq %rsp,%rbp | |
528 | CFI_DEF_CFA_REGISTER rbp | |
1da177e4 LT |
529 | testl $3,CS(%rdi) |
530 | je 1f | |
531 | swapgs | |
96e54049 AK |
532 | /* irqcount is used to check if a CPU is already on an interrupt |
533 | stack or not. While this is essentially redundant with preempt_count | |
534 | it is a little cheaper to use a separate counter in the PDA | |
535 | (short of moving irq_enter into assembly, which would be too | |
536 | much work) */ | |
537 | 1: incl %gs:pda_irqcount | |
1de9c3f6 | 538 | cmoveq %gs:pda_irqstackptr,%rsp |
2699500b | 539 | push %rbp # backlink for old unwinder |
2601e64d IM |
540 | /* |
541 | * We entered an interrupt context - irqs are off: | |
542 | */ | |
543 | TRACE_IRQS_OFF | |
1da177e4 LT |
544 | call \func |
545 | .endm | |
546 | ||
547 | ENTRY(common_interrupt) | |
7effaa88 | 548 | XCPT_FRAME |
1da177e4 LT |
549 | interrupt do_IRQ |
550 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 551 | ret_from_intr: |
1da177e4 | 552 | cli |
2601e64d | 553 | TRACE_IRQS_OFF |
3829ee6b | 554 | decl %gs:pda_irqcount |
1de9c3f6 | 555 | leaveq |
7effaa88 | 556 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 557 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 558 | exit_intr: |
1da177e4 LT |
559 | GET_THREAD_INFO(%rcx) |
560 | testl $3,CS-ARGOFFSET(%rsp) | |
561 | je retint_kernel | |
562 | ||
563 | /* Interrupt came from user space */ | |
564 | /* | |
565 | * Has a correct top of stack, but a partial stack frame | |
566 | * %rcx: thread info. Interrupts off. | |
567 | */ | |
568 | retint_with_reschedule: | |
569 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 570 | retint_check: |
1da177e4 LT |
571 | movl threadinfo_flags(%rcx),%edx |
572 | andl %edi,%edx | |
7effaa88 | 573 | CFI_REMEMBER_STATE |
1da177e4 LT |
574 | jnz retint_careful |
575 | retint_swapgs: | |
2601e64d IM |
576 | /* |
577 | * The iretq could re-enable interrupts: | |
578 | */ | |
579 | cli | |
580 | TRACE_IRQS_IRETQ | |
1da177e4 | 581 | swapgs |
2601e64d IM |
582 | jmp restore_args |
583 | ||
1da177e4 LT |
584 | retint_restore_args: |
585 | cli | |
2601e64d IM |
586 | /* |
587 | * The iretq could re-enable interrupts: | |
588 | */ | |
589 | TRACE_IRQS_IRETQ | |
590 | restore_args: | |
1da177e4 LT |
591 | RESTORE_ARGS 0,8,0 |
592 | iret_label: | |
593 | iretq | |
594 | ||
595 | .section __ex_table,"a" | |
596 | .quad iret_label,bad_iret | |
597 | .previous | |
598 | .section .fixup,"ax" | |
599 | /* force a signal here? this matches i386 behaviour */ | |
600 | /* running with kernel gs */ | |
601 | bad_iret: | |
3076a492 | 602 | movq $11,%rdi /* SIGSEGV */ |
2601e64d | 603 | TRACE_IRQS_ON |
2391c4b5 | 604 | sti |
1da177e4 LT |
605 | jmp do_exit |
606 | .previous | |
607 | ||
7effaa88 | 608 | /* edi: workmask, edx: work */ |
1da177e4 | 609 | retint_careful: |
7effaa88 | 610 | CFI_RESTORE_STATE |
1da177e4 LT |
611 | bt $TIF_NEED_RESCHED,%edx |
612 | jnc retint_signal | |
2601e64d | 613 | TRACE_IRQS_ON |
1da177e4 LT |
614 | sti |
615 | pushq %rdi | |
7effaa88 | 616 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
617 | call schedule |
618 | popq %rdi | |
7effaa88 | 619 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
620 | GET_THREAD_INFO(%rcx) |
621 | cli | |
2601e64d | 622 | TRACE_IRQS_OFF |
1da177e4 LT |
623 | jmp retint_check |
624 | ||
625 | retint_signal: | |
10ffdbb8 AK |
626 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
627 | jz retint_swapgs | |
2601e64d | 628 | TRACE_IRQS_ON |
1da177e4 LT |
629 | sti |
630 | SAVE_REST | |
631 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 632 | xorl %esi,%esi # oldset |
1da177e4 LT |
633 | movq %rsp,%rdi # &pt_regs |
634 | call do_notify_resume | |
635 | RESTORE_REST | |
636 | cli | |
2601e64d | 637 | TRACE_IRQS_OFF |
10ffdbb8 | 638 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 639 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
640 | jmp retint_check |
641 | ||
642 | #ifdef CONFIG_PREEMPT | |
643 | /* Returning to kernel space. Check if we need preemption */ | |
644 | /* rcx: threadinfo. interrupts off. */ | |
b06babac | 645 | ENTRY(retint_kernel) |
1da177e4 LT |
646 | cmpl $0,threadinfo_preempt_count(%rcx) |
647 | jnz retint_restore_args | |
648 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
649 | jnc retint_restore_args | |
650 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
651 | jnc retint_restore_args | |
652 | call preempt_schedule_irq | |
653 | jmp exit_intr | |
654 | #endif | |
4b787e0b | 655 | |
1da177e4 | 656 | CFI_ENDPROC |
4b787e0b | 657 | END(common_interrupt) |
1da177e4 LT |
658 | |
659 | /* | |
660 | * APIC interrupts. | |
661 | */ | |
662 | .macro apicinterrupt num,func | |
7effaa88 | 663 | INTR_FRAME |
19eadf98 | 664 | pushq $~(\num) |
7effaa88 | 665 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
666 | interrupt \func |
667 | jmp ret_from_intr | |
668 | CFI_ENDPROC | |
669 | .endm | |
670 | ||
671 | ENTRY(thermal_interrupt) | |
672 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 673 | END(thermal_interrupt) |
1da177e4 | 674 | |
89b831ef JS |
675 | ENTRY(threshold_interrupt) |
676 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 677 | END(threshold_interrupt) |
89b831ef | 678 | |
1da177e4 LT |
679 | #ifdef CONFIG_SMP |
680 | ENTRY(reschedule_interrupt) | |
681 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 682 | END(reschedule_interrupt) |
1da177e4 | 683 | |
e5bc8b6b AK |
684 | .macro INVALIDATE_ENTRY num |
685 | ENTRY(invalidate_interrupt\num) | |
686 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
4b787e0b | 687 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
688 | .endm |
689 | ||
690 | INVALIDATE_ENTRY 0 | |
691 | INVALIDATE_ENTRY 1 | |
692 | INVALIDATE_ENTRY 2 | |
693 | INVALIDATE_ENTRY 3 | |
694 | INVALIDATE_ENTRY 4 | |
695 | INVALIDATE_ENTRY 5 | |
696 | INVALIDATE_ENTRY 6 | |
697 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
698 | |
699 | ENTRY(call_function_interrupt) | |
700 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 701 | END(call_function_interrupt) |
1da177e4 LT |
702 | #endif |
703 | ||
1da177e4 LT |
704 | ENTRY(apic_timer_interrupt) |
705 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 706 | END(apic_timer_interrupt) |
1da177e4 LT |
707 | |
708 | ENTRY(error_interrupt) | |
709 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 710 | END(error_interrupt) |
1da177e4 LT |
711 | |
712 | ENTRY(spurious_interrupt) | |
713 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 714 | END(spurious_interrupt) |
1da177e4 LT |
715 | |
716 | /* | |
717 | * Exception entry points. | |
718 | */ | |
719 | .macro zeroentry sym | |
7effaa88 | 720 | INTR_FRAME |
1da177e4 | 721 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 722 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 723 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 724 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
725 | leaq \sym(%rip),%rax |
726 | jmp error_entry | |
7effaa88 | 727 | CFI_ENDPROC |
1da177e4 LT |
728 | .endm |
729 | ||
730 | .macro errorentry sym | |
7effaa88 | 731 | XCPT_FRAME |
1da177e4 | 732 | pushq %rax |
7effaa88 | 733 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
734 | leaq \sym(%rip),%rax |
735 | jmp error_entry | |
7effaa88 | 736 | CFI_ENDPROC |
1da177e4 LT |
737 | .endm |
738 | ||
739 | /* error code is on the stack already */ | |
740 | /* handle NMI like exceptions that can happen everywhere */ | |
2601e64d | 741 | .macro paranoidentry sym, ist=0, irqtrace=1 |
1da177e4 LT |
742 | SAVE_ALL |
743 | cld | |
744 | movl $1,%ebx | |
745 | movl $MSR_GS_BASE,%ecx | |
746 | rdmsr | |
747 | testl %edx,%edx | |
748 | js 1f | |
749 | swapgs | |
750 | xorl %ebx,%ebx | |
b556b35e JB |
751 | 1: |
752 | .if \ist | |
753 | movq %gs:pda_data_offset, %rbp | |
754 | .endif | |
755 | movq %rsp,%rdi | |
1da177e4 LT |
756 | movq ORIG_RAX(%rsp),%rsi |
757 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 758 | .if \ist |
5f8efbb9 | 759 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 760 | .endif |
1da177e4 | 761 | call \sym |
b556b35e | 762 | .if \ist |
5f8efbb9 | 763 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 764 | .endif |
6fefb0d1 | 765 | cli |
2601e64d IM |
766 | .if \irqtrace |
767 | TRACE_IRQS_OFF | |
768 | .endif | |
1da177e4 | 769 | .endm |
2601e64d IM |
770 | |
771 | /* | |
772 | * "Paranoid" exit path from exception stack. | |
773 | * Paranoid because this is used by NMIs and cannot take | |
774 | * any kernel state for granted. | |
775 | * We don't do kernel preemption checks here, because only | |
776 | * NMI should be common and it does not enable IRQs and | |
777 | * cannot get reschedule ticks. | |
778 | * | |
779 | * "trace" is 0 for the NMI handler only, because irq-tracing | |
780 | * is fundamentally NMI-unsafe. (we cannot change the soft and | |
781 | * hard flags at once, atomically) | |
782 | */ | |
783 | .macro paranoidexit trace=1 | |
784 | /* ebx: no swapgs flag */ | |
785 | paranoid_exit\trace: | |
786 | testl %ebx,%ebx /* swapgs needed? */ | |
787 | jnz paranoid_restore\trace | |
788 | testl $3,CS(%rsp) | |
789 | jnz paranoid_userspace\trace | |
790 | paranoid_swapgs\trace: | |
7a0a2dff | 791 | .if \trace |
2601e64d | 792 | TRACE_IRQS_IRETQ 0 |
7a0a2dff | 793 | .endif |
2601e64d IM |
794 | swapgs |
795 | paranoid_restore\trace: | |
796 | RESTORE_ALL 8 | |
797 | iretq | |
798 | paranoid_userspace\trace: | |
799 | GET_THREAD_INFO(%rcx) | |
800 | movl threadinfo_flags(%rcx),%ebx | |
801 | andl $_TIF_WORK_MASK,%ebx | |
802 | jz paranoid_swapgs\trace | |
803 | movq %rsp,%rdi /* &pt_regs */ | |
804 | call sync_regs | |
805 | movq %rax,%rsp /* switch stack for scheduling */ | |
806 | testl $_TIF_NEED_RESCHED,%ebx | |
807 | jnz paranoid_schedule\trace | |
808 | movl %ebx,%edx /* arg3: thread flags */ | |
809 | .if \trace | |
810 | TRACE_IRQS_ON | |
811 | .endif | |
812 | sti | |
813 | xorl %esi,%esi /* arg2: oldset */ | |
814 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
815 | call do_notify_resume | |
816 | cli | |
817 | .if \trace | |
818 | TRACE_IRQS_OFF | |
819 | .endif | |
820 | jmp paranoid_userspace\trace | |
821 | paranoid_schedule\trace: | |
822 | .if \trace | |
823 | TRACE_IRQS_ON | |
824 | .endif | |
825 | sti | |
826 | call schedule | |
827 | cli | |
828 | .if \trace | |
829 | TRACE_IRQS_OFF | |
830 | .endif | |
831 | jmp paranoid_userspace\trace | |
832 | CFI_ENDPROC | |
833 | .endm | |
834 | ||
1da177e4 LT |
835 | /* |
836 | * Exception entry point. This expects an error code/orig_rax on the stack | |
837 | * and the exception handler in %rax. | |
838 | */ | |
d28c4393 | 839 | KPROBE_ENTRY(error_entry) |
7effaa88 | 840 | _frame RDI |
1da177e4 LT |
841 | /* rdi slot contains rax, oldrax contains error code */ |
842 | cld | |
843 | subq $14*8,%rsp | |
844 | CFI_ADJUST_CFA_OFFSET (14*8) | |
845 | movq %rsi,13*8(%rsp) | |
846 | CFI_REL_OFFSET rsi,RSI | |
847 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
848 | movq %rdx,12*8(%rsp) | |
849 | CFI_REL_OFFSET rdx,RDX | |
850 | movq %rcx,11*8(%rsp) | |
851 | CFI_REL_OFFSET rcx,RCX | |
852 | movq %rsi,10*8(%rsp) /* store rax */ | |
853 | CFI_REL_OFFSET rax,RAX | |
854 | movq %r8, 9*8(%rsp) | |
855 | CFI_REL_OFFSET r8,R8 | |
856 | movq %r9, 8*8(%rsp) | |
857 | CFI_REL_OFFSET r9,R9 | |
858 | movq %r10,7*8(%rsp) | |
859 | CFI_REL_OFFSET r10,R10 | |
860 | movq %r11,6*8(%rsp) | |
861 | CFI_REL_OFFSET r11,R11 | |
862 | movq %rbx,5*8(%rsp) | |
863 | CFI_REL_OFFSET rbx,RBX | |
864 | movq %rbp,4*8(%rsp) | |
865 | CFI_REL_OFFSET rbp,RBP | |
866 | movq %r12,3*8(%rsp) | |
867 | CFI_REL_OFFSET r12,R12 | |
868 | movq %r13,2*8(%rsp) | |
869 | CFI_REL_OFFSET r13,R13 | |
870 | movq %r14,1*8(%rsp) | |
871 | CFI_REL_OFFSET r14,R14 | |
872 | movq %r15,(%rsp) | |
873 | CFI_REL_OFFSET r15,R15 | |
874 | xorl %ebx,%ebx | |
875 | testl $3,CS(%rsp) | |
876 | je error_kernelspace | |
877 | error_swapgs: | |
878 | swapgs | |
879 | error_sti: | |
880 | movq %rdi,RDI(%rsp) | |
881 | movq %rsp,%rdi | |
882 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
883 | movq $-1,ORIG_RAX(%rsp) | |
884 | call *%rax | |
885 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
886 | error_exit: | |
887 | movl %ebx,%eax | |
888 | RESTORE_REST | |
889 | cli | |
2601e64d | 890 | TRACE_IRQS_OFF |
1da177e4 LT |
891 | GET_THREAD_INFO(%rcx) |
892 | testl %eax,%eax | |
893 | jne retint_kernel | |
894 | movl threadinfo_flags(%rcx),%edx | |
895 | movl $_TIF_WORK_MASK,%edi | |
896 | andl %edi,%edx | |
897 | jnz retint_careful | |
2601e64d IM |
898 | /* |
899 | * The iret might restore flags: | |
900 | */ | |
901 | TRACE_IRQS_IRETQ | |
1da177e4 LT |
902 | swapgs |
903 | RESTORE_ARGS 0,8,0 | |
505cc4e1 | 904 | jmp iret_label |
1da177e4 LT |
905 | CFI_ENDPROC |
906 | ||
907 | error_kernelspace: | |
908 | incl %ebx | |
909 | /* There are two places in the kernel that can potentially fault with | |
910 | usergs. Handle them here. The exception handlers after | |
911 | iret run with kernel gs again, so don't set the user space flag. | |
912 | B stepping K8s sometimes report an truncated RIP for IRET | |
913 | exceptions returning to compat mode. Check for these here too. */ | |
914 | leaq iret_label(%rip),%rbp | |
915 | cmpq %rbp,RIP(%rsp) | |
916 | je error_swapgs | |
917 | movl %ebp,%ebp /* zero extend */ | |
918 | cmpq %rbp,RIP(%rsp) | |
919 | je error_swapgs | |
920 | cmpq $gs_change,RIP(%rsp) | |
921 | je error_swapgs | |
922 | jmp error_sti | |
d28c4393 | 923 | KPROBE_END(error_entry) |
1da177e4 LT |
924 | |
925 | /* Reload gs selector with exception handling */ | |
926 | /* edi: new selector */ | |
927 | ENTRY(load_gs_index) | |
7effaa88 | 928 | CFI_STARTPROC |
1da177e4 | 929 | pushf |
7effaa88 | 930 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
931 | cli |
932 | swapgs | |
933 | gs_change: | |
934 | movl %edi,%gs | |
935 | 2: mfence /* workaround */ | |
936 | swapgs | |
937 | popf | |
7effaa88 | 938 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 939 | ret |
7effaa88 | 940 | CFI_ENDPROC |
4b787e0b | 941 | ENDPROC(load_gs_index) |
1da177e4 LT |
942 | |
943 | .section __ex_table,"a" | |
944 | .align 8 | |
945 | .quad gs_change,bad_gs | |
946 | .previous | |
947 | .section .fixup,"ax" | |
948 | /* running with kernelgs */ | |
949 | bad_gs: | |
950 | swapgs /* switch back to user gs */ | |
951 | xorl %eax,%eax | |
952 | movl %eax,%gs | |
953 | jmp 2b | |
954 | .previous | |
955 | ||
956 | /* | |
957 | * Create a kernel thread. | |
958 | * | |
959 | * C extern interface: | |
960 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
961 | * | |
962 | * asm input arguments: | |
963 | * rdi: fn, rsi: arg, rdx: flags | |
964 | */ | |
965 | ENTRY(kernel_thread) | |
966 | CFI_STARTPROC | |
967 | FAKE_STACK_FRAME $child_rip | |
968 | SAVE_ALL | |
969 | ||
970 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
971 | movq %rdx,%rdi | |
972 | orq kernel_thread_flags(%rip),%rdi | |
973 | movq $-1, %rsi | |
974 | movq %rsp, %rdx | |
975 | ||
976 | xorl %r8d,%r8d | |
977 | xorl %r9d,%r9d | |
978 | ||
979 | # clone now | |
980 | call do_fork | |
981 | movq %rax,RAX(%rsp) | |
982 | xorl %edi,%edi | |
983 | ||
984 | /* | |
985 | * It isn't worth to check for reschedule here, | |
986 | * so internally to the x86_64 port you can rely on kernel_thread() | |
987 | * not to reschedule the child before returning, this avoids the need | |
988 | * of hacks for example to fork off the per-CPU idle tasks. | |
989 | * [Hopefully no generic code relies on the reschedule -AK] | |
990 | */ | |
991 | RESTORE_ALL | |
992 | UNFAKE_STACK_FRAME | |
993 | ret | |
994 | CFI_ENDPROC | |
4b787e0b | 995 | ENDPROC(kernel_thread) |
1da177e4 LT |
996 | |
997 | child_rip: | |
c05991ed AK |
998 | pushq $0 # fake return address |
999 | CFI_STARTPROC | |
1da177e4 LT |
1000 | /* |
1001 | * Here we are in the child and the registers are set as they were | |
1002 | * at kernel_thread() invocation in the parent. | |
1003 | */ | |
1004 | movq %rdi, %rax | |
1005 | movq %rsi, %rdi | |
1006 | call *%rax | |
1007 | # exit | |
3829ee6b | 1008 | xorl %edi, %edi |
1da177e4 | 1009 | call do_exit |
c05991ed | 1010 | CFI_ENDPROC |
4b787e0b | 1011 | ENDPROC(child_rip) |
1da177e4 LT |
1012 | |
1013 | /* | |
1014 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
1015 | * | |
1016 | * C extern interface: | |
1017 | * extern long execve(char *name, char **argv, char **envp) | |
1018 | * | |
1019 | * asm input arguments: | |
1020 | * rdi: name, rsi: argv, rdx: envp | |
1021 | * | |
1022 | * We want to fallback into: | |
1023 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
1024 | * | |
1025 | * do_sys_execve asm fallback arguments: | |
1026 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
1027 | */ | |
3db03b4a | 1028 | ENTRY(kernel_execve) |
1da177e4 LT |
1029 | CFI_STARTPROC |
1030 | FAKE_STACK_FRAME $0 | |
1031 | SAVE_ALL | |
1032 | call sys_execve | |
1033 | movq %rax, RAX(%rsp) | |
1034 | RESTORE_REST | |
1035 | testq %rax,%rax | |
1036 | je int_ret_from_sys_call | |
1037 | RESTORE_ARGS | |
1038 | UNFAKE_STACK_FRAME | |
1039 | ret | |
1040 | CFI_ENDPROC | |
3db03b4a | 1041 | ENDPROC(kernel_execve) |
1da177e4 | 1042 | |
0f2fbdcb | 1043 | KPROBE_ENTRY(page_fault) |
1da177e4 | 1044 | errorentry do_page_fault |
d28c4393 | 1045 | KPROBE_END(page_fault) |
1da177e4 LT |
1046 | |
1047 | ENTRY(coprocessor_error) | |
1048 | zeroentry do_coprocessor_error | |
4b787e0b | 1049 | END(coprocessor_error) |
1da177e4 LT |
1050 | |
1051 | ENTRY(simd_coprocessor_error) | |
1052 | zeroentry do_simd_coprocessor_error | |
4b787e0b | 1053 | END(simd_coprocessor_error) |
1da177e4 LT |
1054 | |
1055 | ENTRY(device_not_available) | |
1056 | zeroentry math_state_restore | |
4b787e0b | 1057 | END(device_not_available) |
1da177e4 LT |
1058 | |
1059 | /* runs on exception stack */ | |
0f2fbdcb | 1060 | KPROBE_ENTRY(debug) |
7effaa88 | 1061 | INTR_FRAME |
1da177e4 LT |
1062 | pushq $0 |
1063 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1064 | paranoidentry do_debug, DEBUG_STACK |
2601e64d | 1065 | paranoidexit |
d28c4393 | 1066 | KPROBE_END(debug) |
1da177e4 LT |
1067 | |
1068 | /* runs on exception stack */ | |
eddb6fb9 | 1069 | KPROBE_ENTRY(nmi) |
7effaa88 | 1070 | INTR_FRAME |
1da177e4 | 1071 | pushq $-1 |
7effaa88 | 1072 | CFI_ADJUST_CFA_OFFSET 8 |
2601e64d IM |
1073 | paranoidentry do_nmi, 0, 0 |
1074 | #ifdef CONFIG_TRACE_IRQFLAGS | |
1075 | paranoidexit 0 | |
1076 | #else | |
1077 | jmp paranoid_exit1 | |
1078 | CFI_ENDPROC | |
1079 | #endif | |
d28c4393 | 1080 | KPROBE_END(nmi) |
6fefb0d1 | 1081 | |
0f2fbdcb | 1082 | KPROBE_ENTRY(int3) |
b556b35e JB |
1083 | INTR_FRAME |
1084 | pushq $0 | |
1085 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1086 | paranoidentry do_int3, DEBUG_STACK |
2601e64d | 1087 | jmp paranoid_exit1 |
b556b35e | 1088 | CFI_ENDPROC |
d28c4393 | 1089 | KPROBE_END(int3) |
1da177e4 LT |
1090 | |
1091 | ENTRY(overflow) | |
1092 | zeroentry do_overflow | |
4b787e0b | 1093 | END(overflow) |
1da177e4 LT |
1094 | |
1095 | ENTRY(bounds) | |
1096 | zeroentry do_bounds | |
4b787e0b | 1097 | END(bounds) |
1da177e4 LT |
1098 | |
1099 | ENTRY(invalid_op) | |
1100 | zeroentry do_invalid_op | |
4b787e0b | 1101 | END(invalid_op) |
1da177e4 LT |
1102 | |
1103 | ENTRY(coprocessor_segment_overrun) | |
1104 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 1105 | END(coprocessor_segment_overrun) |
1da177e4 LT |
1106 | |
1107 | ENTRY(reserved) | |
1108 | zeroentry do_reserved | |
4b787e0b | 1109 | END(reserved) |
1da177e4 LT |
1110 | |
1111 | /* runs on exception stack */ | |
1112 | ENTRY(double_fault) | |
7effaa88 | 1113 | XCPT_FRAME |
1da177e4 | 1114 | paranoidentry do_double_fault |
2601e64d | 1115 | jmp paranoid_exit1 |
1da177e4 | 1116 | CFI_ENDPROC |
4b787e0b | 1117 | END(double_fault) |
1da177e4 LT |
1118 | |
1119 | ENTRY(invalid_TSS) | |
1120 | errorentry do_invalid_TSS | |
4b787e0b | 1121 | END(invalid_TSS) |
1da177e4 LT |
1122 | |
1123 | ENTRY(segment_not_present) | |
1124 | errorentry do_segment_not_present | |
4b787e0b | 1125 | END(segment_not_present) |
1da177e4 LT |
1126 | |
1127 | /* runs on exception stack */ | |
1128 | ENTRY(stack_segment) | |
7effaa88 | 1129 | XCPT_FRAME |
1da177e4 | 1130 | paranoidentry do_stack_segment |
2601e64d | 1131 | jmp paranoid_exit1 |
1da177e4 | 1132 | CFI_ENDPROC |
4b787e0b | 1133 | END(stack_segment) |
1da177e4 | 1134 | |
0f2fbdcb | 1135 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1136 | errorentry do_general_protection |
d28c4393 | 1137 | KPROBE_END(general_protection) |
1da177e4 LT |
1138 | |
1139 | ENTRY(alignment_check) | |
1140 | errorentry do_alignment_check | |
4b787e0b | 1141 | END(alignment_check) |
1da177e4 LT |
1142 | |
1143 | ENTRY(divide_error) | |
1144 | zeroentry do_divide_error | |
4b787e0b | 1145 | END(divide_error) |
1da177e4 LT |
1146 | |
1147 | ENTRY(spurious_interrupt_bug) | |
1148 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1149 | END(spurious_interrupt_bug) |
1da177e4 LT |
1150 | |
1151 | #ifdef CONFIG_X86_MCE | |
1152 | /* runs on exception stack */ | |
1153 | ENTRY(machine_check) | |
7effaa88 | 1154 | INTR_FRAME |
1da177e4 LT |
1155 | pushq $0 |
1156 | CFI_ADJUST_CFA_OFFSET 8 | |
1157 | paranoidentry do_machine_check | |
2601e64d | 1158 | jmp paranoid_exit1 |
1da177e4 | 1159 | CFI_ENDPROC |
4b787e0b | 1160 | END(machine_check) |
1da177e4 LT |
1161 | #endif |
1162 | ||
2699500b | 1163 | /* Call softirq on interrupt stack. Interrupts are off. */ |
ed6b676c | 1164 | ENTRY(call_softirq) |
7effaa88 | 1165 | CFI_STARTPROC |
2699500b AK |
1166 | push %rbp |
1167 | CFI_ADJUST_CFA_OFFSET 8 | |
1168 | CFI_REL_OFFSET rbp,0 | |
1169 | mov %rsp,%rbp | |
1170 | CFI_DEF_CFA_REGISTER rbp | |
ed6b676c | 1171 | incl %gs:pda_irqcount |
2699500b AK |
1172 | cmove %gs:pda_irqstackptr,%rsp |
1173 | push %rbp # backlink for old unwinder | |
ed6b676c | 1174 | call __do_softirq |
2699500b | 1175 | leaveq |
7effaa88 | 1176 | CFI_DEF_CFA_REGISTER rsp |
2699500b | 1177 | CFI_ADJUST_CFA_OFFSET -8 |
ed6b676c | 1178 | decl %gs:pda_irqcount |
ed6b676c | 1179 | ret |
7effaa88 | 1180 | CFI_ENDPROC |
4b787e0b | 1181 | ENDPROC(call_softirq) |
b538ed27 JB |
1182 | |
1183 | #ifdef CONFIG_STACK_UNWIND | |
1184 | ENTRY(arch_unwind_init_running) | |
1185 | CFI_STARTPROC | |
1186 | movq %r15, R15(%rdi) | |
1187 | movq %r14, R14(%rdi) | |
1188 | xchgq %rsi, %rdx | |
1189 | movq %r13, R13(%rdi) | |
1190 | movq %r12, R12(%rdi) | |
1191 | xorl %eax, %eax | |
1192 | movq %rbp, RBP(%rdi) | |
1193 | movq %rbx, RBX(%rdi) | |
1194 | movq (%rsp), %rcx | |
1195 | movq %rax, R11(%rdi) | |
1196 | movq %rax, R10(%rdi) | |
1197 | movq %rax, R9(%rdi) | |
1198 | movq %rax, R8(%rdi) | |
1199 | movq %rax, RAX(%rdi) | |
1200 | movq %rax, RCX(%rdi) | |
1201 | movq %rax, RDX(%rdi) | |
1202 | movq %rax, RSI(%rdi) | |
1203 | movq %rax, RDI(%rdi) | |
1204 | movq %rax, ORIG_RAX(%rdi) | |
1205 | movq %rcx, RIP(%rdi) | |
1206 | leaq 8(%rsp), %rcx | |
1207 | movq $__KERNEL_CS, CS(%rdi) | |
1208 | movq %rax, EFLAGS(%rdi) | |
1209 | movq %rcx, RSP(%rdi) | |
1210 | movq $__KERNEL_DS, SS(%rdi) | |
1211 | jmpq *%rdx | |
1212 | CFI_ENDPROC | |
1213 | ENDPROC(arch_unwind_init_running) | |
1214 | #endif |