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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 | |
318 | ja 1f | |
319 | movq %r10,%rcx /* fixup for C */ | |
320 | call *sys_call_table(,%rax,8) | |
822ff019 | 321 | 1: movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc AK |
322 | /* Use IRET because user could have changed frame */ |
323 | jmp int_ret_from_sys_call | |
7effaa88 | 324 | CFI_ENDPROC |
4b787e0b | 325 | END(system_call) |
1da177e4 | 326 | |
1da177e4 LT |
327 | /* |
328 | * Syscall return path ending with IRET. | |
329 | * Has correct top of stack, but partial stack frame. | |
330 | */ | |
7effaa88 JB |
331 | ENTRY(int_ret_from_sys_call) |
332 | CFI_STARTPROC simple | |
adf14236 | 333 | CFI_SIGNAL_FRAME |
7effaa88 JB |
334 | CFI_DEF_CFA rsp,SS+8-ARGOFFSET |
335 | /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/ | |
336 | CFI_REL_OFFSET rsp,RSP-ARGOFFSET | |
337 | /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/ | |
338 | /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/ | |
339 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
340 | CFI_REL_OFFSET rdx,RDX-ARGOFFSET | |
341 | CFI_REL_OFFSET rcx,RCX-ARGOFFSET | |
342 | CFI_REL_OFFSET rax,RAX-ARGOFFSET | |
343 | CFI_REL_OFFSET rdi,RDI-ARGOFFSET | |
344 | CFI_REL_OFFSET rsi,RSI-ARGOFFSET | |
345 | CFI_REL_OFFSET r8,R8-ARGOFFSET | |
346 | CFI_REL_OFFSET r9,R9-ARGOFFSET | |
347 | CFI_REL_OFFSET r10,R10-ARGOFFSET | |
348 | CFI_REL_OFFSET r11,R11-ARGOFFSET | |
1da177e4 | 349 | cli |
2601e64d | 350 | TRACE_IRQS_OFF |
1da177e4 LT |
351 | testl $3,CS-ARGOFFSET(%rsp) |
352 | je retint_restore_args | |
353 | movl $_TIF_ALLWORK_MASK,%edi | |
354 | /* edi: mask to check */ | |
355 | int_with_check: | |
356 | GET_THREAD_INFO(%rcx) | |
357 | movl threadinfo_flags(%rcx),%edx | |
358 | andl %edi,%edx | |
359 | jnz int_careful | |
bf2fcc6f | 360 | andl $~TS_COMPAT,threadinfo_status(%rcx) |
1da177e4 LT |
361 | jmp retint_swapgs |
362 | ||
363 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
364 | /* First do a reschedule test. */ | |
365 | /* edx: work, edi: workmask */ | |
366 | int_careful: | |
367 | bt $TIF_NEED_RESCHED,%edx | |
368 | jnc int_very_careful | |
2601e64d | 369 | TRACE_IRQS_ON |
1da177e4 LT |
370 | sti |
371 | pushq %rdi | |
7effaa88 | 372 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
373 | call schedule |
374 | popq %rdi | |
7effaa88 | 375 | CFI_ADJUST_CFA_OFFSET -8 |
cdd219cd | 376 | cli |
2601e64d | 377 | TRACE_IRQS_OFF |
1da177e4 LT |
378 | jmp int_with_check |
379 | ||
380 | /* handle signals and tracing -- both require a full stack frame */ | |
381 | int_very_careful: | |
2601e64d | 382 | TRACE_IRQS_ON |
1da177e4 LT |
383 | sti |
384 | SAVE_REST | |
385 | /* Check for syscall exit trace */ | |
386 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx | |
387 | jz int_signal | |
388 | pushq %rdi | |
7effaa88 | 389 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
390 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
391 | call syscall_trace_leave | |
392 | popq %rdi | |
7effaa88 | 393 | CFI_ADJUST_CFA_OFFSET -8 |
36c1104e | 394 | andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi |
be9e6870 | 395 | cli |
2601e64d | 396 | TRACE_IRQS_OFF |
1da177e4 LT |
397 | jmp int_restore_rest |
398 | ||
399 | int_signal: | |
400 | testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx | |
401 | jz 1f | |
402 | movq %rsp,%rdi # &ptregs -> arg1 | |
403 | xorl %esi,%esi # oldset -> arg2 | |
404 | call do_notify_resume | |
405 | 1: movl $_TIF_NEED_RESCHED,%edi | |
406 | int_restore_rest: | |
407 | RESTORE_REST | |
be9e6870 | 408 | cli |
2601e64d | 409 | TRACE_IRQS_OFF |
1da177e4 LT |
410 | jmp int_with_check |
411 | CFI_ENDPROC | |
4b787e0b | 412 | END(int_ret_from_sys_call) |
1da177e4 LT |
413 | |
414 | /* | |
415 | * Certain special system calls that need to save a complete full stack frame. | |
416 | */ | |
417 | ||
418 | .macro PTREGSCALL label,func,arg | |
419 | .globl \label | |
420 | \label: | |
421 | leaq \func(%rip),%rax | |
422 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
423 | jmp ptregscall_common | |
4b787e0b | 424 | END(\label) |
1da177e4 LT |
425 | .endm |
426 | ||
7effaa88 JB |
427 | CFI_STARTPROC |
428 | ||
1da177e4 LT |
429 | PTREGSCALL stub_clone, sys_clone, %r8 |
430 | PTREGSCALL stub_fork, sys_fork, %rdi | |
431 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
432 | PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx | |
433 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx | |
434 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
435 | ||
436 | ENTRY(ptregscall_common) | |
1da177e4 | 437 | popq %r11 |
7effaa88 JB |
438 | CFI_ADJUST_CFA_OFFSET -8 |
439 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
440 | SAVE_REST |
441 | movq %r11, %r15 | |
7effaa88 | 442 | CFI_REGISTER rip, r15 |
1da177e4 LT |
443 | FIXUP_TOP_OF_STACK %r11 |
444 | call *%rax | |
445 | RESTORE_TOP_OF_STACK %r11 | |
446 | movq %r15, %r11 | |
7effaa88 | 447 | CFI_REGISTER rip, r11 |
1da177e4 LT |
448 | RESTORE_REST |
449 | pushq %r11 | |
7effaa88 JB |
450 | CFI_ADJUST_CFA_OFFSET 8 |
451 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
452 | ret |
453 | CFI_ENDPROC | |
4b787e0b | 454 | END(ptregscall_common) |
1da177e4 LT |
455 | |
456 | ENTRY(stub_execve) | |
457 | CFI_STARTPROC | |
458 | popq %r11 | |
7effaa88 JB |
459 | CFI_ADJUST_CFA_OFFSET -8 |
460 | CFI_REGISTER rip, r11 | |
1da177e4 | 461 | SAVE_REST |
1da177e4 LT |
462 | FIXUP_TOP_OF_STACK %r11 |
463 | call sys_execve | |
1da177e4 | 464 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
465 | movq %rax,RAX(%rsp) |
466 | RESTORE_REST | |
467 | jmp int_ret_from_sys_call | |
468 | CFI_ENDPROC | |
4b787e0b | 469 | END(stub_execve) |
1da177e4 LT |
470 | |
471 | /* | |
472 | * sigreturn is special because it needs to restore all registers on return. | |
473 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
474 | */ | |
475 | ENTRY(stub_rt_sigreturn) | |
476 | CFI_STARTPROC | |
7effaa88 JB |
477 | addq $8, %rsp |
478 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
479 | SAVE_REST |
480 | movq %rsp,%rdi | |
481 | FIXUP_TOP_OF_STACK %r11 | |
482 | call sys_rt_sigreturn | |
483 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
484 | RESTORE_REST | |
485 | jmp int_ret_from_sys_call | |
486 | CFI_ENDPROC | |
4b787e0b | 487 | END(stub_rt_sigreturn) |
1da177e4 | 488 | |
7effaa88 JB |
489 | /* |
490 | * initial frame state for interrupts and exceptions | |
491 | */ | |
492 | .macro _frame ref | |
493 | CFI_STARTPROC simple | |
adf14236 | 494 | CFI_SIGNAL_FRAME |
7effaa88 JB |
495 | CFI_DEF_CFA rsp,SS+8-\ref |
496 | /*CFI_REL_OFFSET ss,SS-\ref*/ | |
497 | CFI_REL_OFFSET rsp,RSP-\ref | |
498 | /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/ | |
499 | /*CFI_REL_OFFSET cs,CS-\ref*/ | |
500 | CFI_REL_OFFSET rip,RIP-\ref | |
501 | .endm | |
502 | ||
503 | /* initial frame state for interrupts (and exceptions without error code) */ | |
504 | #define INTR_FRAME _frame RIP | |
505 | /* initial frame state for exceptions with error code (and interrupts with | |
506 | vector already pushed) */ | |
507 | #define XCPT_FRAME _frame ORIG_RAX | |
508 | ||
1da177e4 LT |
509 | /* |
510 | * Interrupt entry/exit. | |
511 | * | |
512 | * Interrupt entry points save only callee clobbered registers in fast path. | |
513 | * | |
514 | * Entry runs with interrupts off. | |
515 | */ | |
516 | ||
517 | /* 0(%rsp): interrupt number */ | |
518 | .macro interrupt func | |
1da177e4 | 519 | cld |
1da177e4 LT |
520 | SAVE_ARGS |
521 | leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler | |
1de9c3f6 JB |
522 | pushq %rbp |
523 | CFI_ADJUST_CFA_OFFSET 8 | |
524 | CFI_REL_OFFSET rbp, 0 | |
525 | movq %rsp,%rbp | |
526 | CFI_DEF_CFA_REGISTER rbp | |
1da177e4 LT |
527 | testl $3,CS(%rdi) |
528 | je 1f | |
529 | swapgs | |
96e54049 AK |
530 | /* irqcount is used to check if a CPU is already on an interrupt |
531 | stack or not. While this is essentially redundant with preempt_count | |
532 | it is a little cheaper to use a separate counter in the PDA | |
533 | (short of moving irq_enter into assembly, which would be too | |
534 | much work) */ | |
535 | 1: incl %gs:pda_irqcount | |
1de9c3f6 | 536 | cmoveq %gs:pda_irqstackptr,%rsp |
2699500b | 537 | push %rbp # backlink for old unwinder |
2601e64d IM |
538 | /* |
539 | * We entered an interrupt context - irqs are off: | |
540 | */ | |
541 | TRACE_IRQS_OFF | |
1da177e4 LT |
542 | call \func |
543 | .endm | |
544 | ||
545 | ENTRY(common_interrupt) | |
7effaa88 | 546 | XCPT_FRAME |
1da177e4 LT |
547 | interrupt do_IRQ |
548 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 549 | ret_from_intr: |
1da177e4 | 550 | cli |
2601e64d | 551 | TRACE_IRQS_OFF |
3829ee6b | 552 | decl %gs:pda_irqcount |
1de9c3f6 | 553 | leaveq |
7effaa88 | 554 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 555 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 556 | exit_intr: |
1da177e4 LT |
557 | GET_THREAD_INFO(%rcx) |
558 | testl $3,CS-ARGOFFSET(%rsp) | |
559 | je retint_kernel | |
560 | ||
561 | /* Interrupt came from user space */ | |
562 | /* | |
563 | * Has a correct top of stack, but a partial stack frame | |
564 | * %rcx: thread info. Interrupts off. | |
565 | */ | |
566 | retint_with_reschedule: | |
567 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 568 | retint_check: |
1da177e4 LT |
569 | movl threadinfo_flags(%rcx),%edx |
570 | andl %edi,%edx | |
7effaa88 | 571 | CFI_REMEMBER_STATE |
1da177e4 LT |
572 | jnz retint_careful |
573 | retint_swapgs: | |
2601e64d IM |
574 | /* |
575 | * The iretq could re-enable interrupts: | |
576 | */ | |
577 | cli | |
578 | TRACE_IRQS_IRETQ | |
1da177e4 | 579 | swapgs |
2601e64d IM |
580 | jmp restore_args |
581 | ||
1da177e4 LT |
582 | retint_restore_args: |
583 | cli | |
2601e64d IM |
584 | /* |
585 | * The iretq could re-enable interrupts: | |
586 | */ | |
587 | TRACE_IRQS_IRETQ | |
588 | restore_args: | |
1da177e4 LT |
589 | RESTORE_ARGS 0,8,0 |
590 | iret_label: | |
591 | iretq | |
592 | ||
593 | .section __ex_table,"a" | |
594 | .quad iret_label,bad_iret | |
595 | .previous | |
596 | .section .fixup,"ax" | |
597 | /* force a signal here? this matches i386 behaviour */ | |
598 | /* running with kernel gs */ | |
599 | bad_iret: | |
3076a492 | 600 | movq $11,%rdi /* SIGSEGV */ |
2601e64d | 601 | TRACE_IRQS_ON |
2391c4b5 | 602 | sti |
1da177e4 LT |
603 | jmp do_exit |
604 | .previous | |
605 | ||
7effaa88 | 606 | /* edi: workmask, edx: work */ |
1da177e4 | 607 | retint_careful: |
7effaa88 | 608 | CFI_RESTORE_STATE |
1da177e4 LT |
609 | bt $TIF_NEED_RESCHED,%edx |
610 | jnc retint_signal | |
2601e64d | 611 | TRACE_IRQS_ON |
1da177e4 LT |
612 | sti |
613 | pushq %rdi | |
7effaa88 | 614 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
615 | call schedule |
616 | popq %rdi | |
7effaa88 | 617 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
618 | GET_THREAD_INFO(%rcx) |
619 | cli | |
2601e64d | 620 | TRACE_IRQS_OFF |
1da177e4 LT |
621 | jmp retint_check |
622 | ||
623 | retint_signal: | |
10ffdbb8 AK |
624 | testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx |
625 | jz retint_swapgs | |
2601e64d | 626 | TRACE_IRQS_ON |
1da177e4 LT |
627 | sti |
628 | SAVE_REST | |
629 | movq $-1,ORIG_RAX(%rsp) | |
3829ee6b | 630 | xorl %esi,%esi # oldset |
1da177e4 LT |
631 | movq %rsp,%rdi # &pt_regs |
632 | call do_notify_resume | |
633 | RESTORE_REST | |
634 | cli | |
2601e64d | 635 | TRACE_IRQS_OFF |
10ffdbb8 | 636 | movl $_TIF_NEED_RESCHED,%edi |
be9e6870 | 637 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
638 | jmp retint_check |
639 | ||
640 | #ifdef CONFIG_PREEMPT | |
641 | /* Returning to kernel space. Check if we need preemption */ | |
642 | /* rcx: threadinfo. interrupts off. */ | |
b06babac | 643 | ENTRY(retint_kernel) |
1da177e4 LT |
644 | cmpl $0,threadinfo_preempt_count(%rcx) |
645 | jnz retint_restore_args | |
646 | bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx) | |
647 | jnc retint_restore_args | |
648 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
649 | jnc retint_restore_args | |
650 | call preempt_schedule_irq | |
651 | jmp exit_intr | |
652 | #endif | |
4b787e0b | 653 | |
1da177e4 | 654 | CFI_ENDPROC |
4b787e0b | 655 | END(common_interrupt) |
1da177e4 LT |
656 | |
657 | /* | |
658 | * APIC interrupts. | |
659 | */ | |
660 | .macro apicinterrupt num,func | |
7effaa88 | 661 | INTR_FRAME |
19eadf98 | 662 | pushq $~(\num) |
7effaa88 | 663 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
664 | interrupt \func |
665 | jmp ret_from_intr | |
666 | CFI_ENDPROC | |
667 | .endm | |
668 | ||
669 | ENTRY(thermal_interrupt) | |
670 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 671 | END(thermal_interrupt) |
1da177e4 | 672 | |
89b831ef JS |
673 | ENTRY(threshold_interrupt) |
674 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 675 | END(threshold_interrupt) |
89b831ef | 676 | |
1da177e4 LT |
677 | #ifdef CONFIG_SMP |
678 | ENTRY(reschedule_interrupt) | |
679 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 680 | END(reschedule_interrupt) |
1da177e4 | 681 | |
e5bc8b6b AK |
682 | .macro INVALIDATE_ENTRY num |
683 | ENTRY(invalidate_interrupt\num) | |
684 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt | |
4b787e0b | 685 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
686 | .endm |
687 | ||
688 | INVALIDATE_ENTRY 0 | |
689 | INVALIDATE_ENTRY 1 | |
690 | INVALIDATE_ENTRY 2 | |
691 | INVALIDATE_ENTRY 3 | |
692 | INVALIDATE_ENTRY 4 | |
693 | INVALIDATE_ENTRY 5 | |
694 | INVALIDATE_ENTRY 6 | |
695 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
696 | |
697 | ENTRY(call_function_interrupt) | |
698 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 699 | END(call_function_interrupt) |
1da177e4 LT |
700 | #endif |
701 | ||
1da177e4 LT |
702 | ENTRY(apic_timer_interrupt) |
703 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 704 | END(apic_timer_interrupt) |
1da177e4 LT |
705 | |
706 | ENTRY(error_interrupt) | |
707 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 708 | END(error_interrupt) |
1da177e4 LT |
709 | |
710 | ENTRY(spurious_interrupt) | |
711 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 712 | END(spurious_interrupt) |
1da177e4 LT |
713 | |
714 | /* | |
715 | * Exception entry points. | |
716 | */ | |
717 | .macro zeroentry sym | |
7effaa88 | 718 | INTR_FRAME |
1da177e4 | 719 | pushq $0 /* push error code/oldrax */ |
7effaa88 | 720 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 721 | pushq %rax /* push real oldrax to the rdi slot */ |
7effaa88 | 722 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
723 | leaq \sym(%rip),%rax |
724 | jmp error_entry | |
7effaa88 | 725 | CFI_ENDPROC |
1da177e4 LT |
726 | .endm |
727 | ||
728 | .macro errorentry sym | |
7effaa88 | 729 | XCPT_FRAME |
1da177e4 | 730 | pushq %rax |
7effaa88 | 731 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
732 | leaq \sym(%rip),%rax |
733 | jmp error_entry | |
7effaa88 | 734 | CFI_ENDPROC |
1da177e4 LT |
735 | .endm |
736 | ||
737 | /* error code is on the stack already */ | |
738 | /* handle NMI like exceptions that can happen everywhere */ | |
2601e64d | 739 | .macro paranoidentry sym, ist=0, irqtrace=1 |
1da177e4 LT |
740 | SAVE_ALL |
741 | cld | |
742 | movl $1,%ebx | |
743 | movl $MSR_GS_BASE,%ecx | |
744 | rdmsr | |
745 | testl %edx,%edx | |
746 | js 1f | |
747 | swapgs | |
748 | xorl %ebx,%ebx | |
b556b35e JB |
749 | 1: |
750 | .if \ist | |
751 | movq %gs:pda_data_offset, %rbp | |
752 | .endif | |
753 | movq %rsp,%rdi | |
1da177e4 LT |
754 | movq ORIG_RAX(%rsp),%rsi |
755 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 756 | .if \ist |
5f8efbb9 | 757 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 758 | .endif |
1da177e4 | 759 | call \sym |
b556b35e | 760 | .if \ist |
5f8efbb9 | 761 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 762 | .endif |
6fefb0d1 | 763 | cli |
2601e64d IM |
764 | .if \irqtrace |
765 | TRACE_IRQS_OFF | |
766 | .endif | |
1da177e4 | 767 | .endm |
2601e64d IM |
768 | |
769 | /* | |
770 | * "Paranoid" exit path from exception stack. | |
771 | * Paranoid because this is used by NMIs and cannot take | |
772 | * any kernel state for granted. | |
773 | * We don't do kernel preemption checks here, because only | |
774 | * NMI should be common and it does not enable IRQs and | |
775 | * cannot get reschedule ticks. | |
776 | * | |
777 | * "trace" is 0 for the NMI handler only, because irq-tracing | |
778 | * is fundamentally NMI-unsafe. (we cannot change the soft and | |
779 | * hard flags at once, atomically) | |
780 | */ | |
781 | .macro paranoidexit trace=1 | |
782 | /* ebx: no swapgs flag */ | |
783 | paranoid_exit\trace: | |
784 | testl %ebx,%ebx /* swapgs needed? */ | |
785 | jnz paranoid_restore\trace | |
786 | testl $3,CS(%rsp) | |
787 | jnz paranoid_userspace\trace | |
788 | paranoid_swapgs\trace: | |
7a0a2dff | 789 | .if \trace |
2601e64d | 790 | TRACE_IRQS_IRETQ 0 |
7a0a2dff | 791 | .endif |
2601e64d IM |
792 | swapgs |
793 | paranoid_restore\trace: | |
794 | RESTORE_ALL 8 | |
795 | iretq | |
796 | paranoid_userspace\trace: | |
797 | GET_THREAD_INFO(%rcx) | |
798 | movl threadinfo_flags(%rcx),%ebx | |
799 | andl $_TIF_WORK_MASK,%ebx | |
800 | jz paranoid_swapgs\trace | |
801 | movq %rsp,%rdi /* &pt_regs */ | |
802 | call sync_regs | |
803 | movq %rax,%rsp /* switch stack for scheduling */ | |
804 | testl $_TIF_NEED_RESCHED,%ebx | |
805 | jnz paranoid_schedule\trace | |
806 | movl %ebx,%edx /* arg3: thread flags */ | |
807 | .if \trace | |
808 | TRACE_IRQS_ON | |
809 | .endif | |
810 | sti | |
811 | xorl %esi,%esi /* arg2: oldset */ | |
812 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
813 | call do_notify_resume | |
814 | cli | |
815 | .if \trace | |
816 | TRACE_IRQS_OFF | |
817 | .endif | |
818 | jmp paranoid_userspace\trace | |
819 | paranoid_schedule\trace: | |
820 | .if \trace | |
821 | TRACE_IRQS_ON | |
822 | .endif | |
823 | sti | |
824 | call schedule | |
825 | cli | |
826 | .if \trace | |
827 | TRACE_IRQS_OFF | |
828 | .endif | |
829 | jmp paranoid_userspace\trace | |
830 | CFI_ENDPROC | |
831 | .endm | |
832 | ||
1da177e4 LT |
833 | /* |
834 | * Exception entry point. This expects an error code/orig_rax on the stack | |
835 | * and the exception handler in %rax. | |
836 | */ | |
d28c4393 | 837 | KPROBE_ENTRY(error_entry) |
7effaa88 | 838 | _frame RDI |
1da177e4 LT |
839 | /* rdi slot contains rax, oldrax contains error code */ |
840 | cld | |
841 | subq $14*8,%rsp | |
842 | CFI_ADJUST_CFA_OFFSET (14*8) | |
843 | movq %rsi,13*8(%rsp) | |
844 | CFI_REL_OFFSET rsi,RSI | |
845 | movq 14*8(%rsp),%rsi /* load rax from rdi slot */ | |
846 | movq %rdx,12*8(%rsp) | |
847 | CFI_REL_OFFSET rdx,RDX | |
848 | movq %rcx,11*8(%rsp) | |
849 | CFI_REL_OFFSET rcx,RCX | |
850 | movq %rsi,10*8(%rsp) /* store rax */ | |
851 | CFI_REL_OFFSET rax,RAX | |
852 | movq %r8, 9*8(%rsp) | |
853 | CFI_REL_OFFSET r8,R8 | |
854 | movq %r9, 8*8(%rsp) | |
855 | CFI_REL_OFFSET r9,R9 | |
856 | movq %r10,7*8(%rsp) | |
857 | CFI_REL_OFFSET r10,R10 | |
858 | movq %r11,6*8(%rsp) | |
859 | CFI_REL_OFFSET r11,R11 | |
860 | movq %rbx,5*8(%rsp) | |
861 | CFI_REL_OFFSET rbx,RBX | |
862 | movq %rbp,4*8(%rsp) | |
863 | CFI_REL_OFFSET rbp,RBP | |
864 | movq %r12,3*8(%rsp) | |
865 | CFI_REL_OFFSET r12,R12 | |
866 | movq %r13,2*8(%rsp) | |
867 | CFI_REL_OFFSET r13,R13 | |
868 | movq %r14,1*8(%rsp) | |
869 | CFI_REL_OFFSET r14,R14 | |
870 | movq %r15,(%rsp) | |
871 | CFI_REL_OFFSET r15,R15 | |
872 | xorl %ebx,%ebx | |
873 | testl $3,CS(%rsp) | |
874 | je error_kernelspace | |
875 | error_swapgs: | |
876 | swapgs | |
877 | error_sti: | |
878 | movq %rdi,RDI(%rsp) | |
879 | movq %rsp,%rdi | |
880 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
881 | movq $-1,ORIG_RAX(%rsp) | |
882 | call *%rax | |
883 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
884 | error_exit: | |
885 | movl %ebx,%eax | |
886 | RESTORE_REST | |
887 | cli | |
2601e64d | 888 | TRACE_IRQS_OFF |
1da177e4 LT |
889 | GET_THREAD_INFO(%rcx) |
890 | testl %eax,%eax | |
891 | jne retint_kernel | |
892 | movl threadinfo_flags(%rcx),%edx | |
893 | movl $_TIF_WORK_MASK,%edi | |
894 | andl %edi,%edx | |
895 | jnz retint_careful | |
2601e64d IM |
896 | /* |
897 | * The iret might restore flags: | |
898 | */ | |
899 | TRACE_IRQS_IRETQ | |
1da177e4 LT |
900 | swapgs |
901 | RESTORE_ARGS 0,8,0 | |
505cc4e1 | 902 | jmp iret_label |
1da177e4 LT |
903 | CFI_ENDPROC |
904 | ||
905 | error_kernelspace: | |
906 | incl %ebx | |
907 | /* There are two places in the kernel that can potentially fault with | |
908 | usergs. Handle them here. The exception handlers after | |
909 | iret run with kernel gs again, so don't set the user space flag. | |
910 | B stepping K8s sometimes report an truncated RIP for IRET | |
911 | exceptions returning to compat mode. Check for these here too. */ | |
912 | leaq iret_label(%rip),%rbp | |
913 | cmpq %rbp,RIP(%rsp) | |
914 | je error_swapgs | |
915 | movl %ebp,%ebp /* zero extend */ | |
916 | cmpq %rbp,RIP(%rsp) | |
917 | je error_swapgs | |
918 | cmpq $gs_change,RIP(%rsp) | |
919 | je error_swapgs | |
920 | jmp error_sti | |
d28c4393 | 921 | KPROBE_END(error_entry) |
1da177e4 LT |
922 | |
923 | /* Reload gs selector with exception handling */ | |
924 | /* edi: new selector */ | |
925 | ENTRY(load_gs_index) | |
7effaa88 | 926 | CFI_STARTPROC |
1da177e4 | 927 | pushf |
7effaa88 | 928 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
929 | cli |
930 | swapgs | |
931 | gs_change: | |
932 | movl %edi,%gs | |
933 | 2: mfence /* workaround */ | |
934 | swapgs | |
935 | popf | |
7effaa88 | 936 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 937 | ret |
7effaa88 | 938 | CFI_ENDPROC |
4b787e0b | 939 | ENDPROC(load_gs_index) |
1da177e4 LT |
940 | |
941 | .section __ex_table,"a" | |
942 | .align 8 | |
943 | .quad gs_change,bad_gs | |
944 | .previous | |
945 | .section .fixup,"ax" | |
946 | /* running with kernelgs */ | |
947 | bad_gs: | |
948 | swapgs /* switch back to user gs */ | |
949 | xorl %eax,%eax | |
950 | movl %eax,%gs | |
951 | jmp 2b | |
952 | .previous | |
953 | ||
954 | /* | |
955 | * Create a kernel thread. | |
956 | * | |
957 | * C extern interface: | |
958 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
959 | * | |
960 | * asm input arguments: | |
961 | * rdi: fn, rsi: arg, rdx: flags | |
962 | */ | |
963 | ENTRY(kernel_thread) | |
964 | CFI_STARTPROC | |
965 | FAKE_STACK_FRAME $child_rip | |
966 | SAVE_ALL | |
967 | ||
968 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
969 | movq %rdx,%rdi | |
970 | orq kernel_thread_flags(%rip),%rdi | |
971 | movq $-1, %rsi | |
972 | movq %rsp, %rdx | |
973 | ||
974 | xorl %r8d,%r8d | |
975 | xorl %r9d,%r9d | |
976 | ||
977 | # clone now | |
978 | call do_fork | |
979 | movq %rax,RAX(%rsp) | |
980 | xorl %edi,%edi | |
981 | ||
982 | /* | |
983 | * It isn't worth to check for reschedule here, | |
984 | * so internally to the x86_64 port you can rely on kernel_thread() | |
985 | * not to reschedule the child before returning, this avoids the need | |
986 | * of hacks for example to fork off the per-CPU idle tasks. | |
987 | * [Hopefully no generic code relies on the reschedule -AK] | |
988 | */ | |
989 | RESTORE_ALL | |
990 | UNFAKE_STACK_FRAME | |
991 | ret | |
992 | CFI_ENDPROC | |
4b787e0b | 993 | ENDPROC(kernel_thread) |
1da177e4 LT |
994 | |
995 | child_rip: | |
c05991ed AK |
996 | pushq $0 # fake return address |
997 | CFI_STARTPROC | |
1da177e4 LT |
998 | /* |
999 | * Here we are in the child and the registers are set as they were | |
1000 | * at kernel_thread() invocation in the parent. | |
1001 | */ | |
1002 | movq %rdi, %rax | |
1003 | movq %rsi, %rdi | |
1004 | call *%rax | |
1005 | # exit | |
3829ee6b | 1006 | xorl %edi, %edi |
1da177e4 | 1007 | call do_exit |
c05991ed | 1008 | CFI_ENDPROC |
4b787e0b | 1009 | ENDPROC(child_rip) |
1da177e4 LT |
1010 | |
1011 | /* | |
1012 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
1013 | * | |
1014 | * C extern interface: | |
1015 | * extern long execve(char *name, char **argv, char **envp) | |
1016 | * | |
1017 | * asm input arguments: | |
1018 | * rdi: name, rsi: argv, rdx: envp | |
1019 | * | |
1020 | * We want to fallback into: | |
1021 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs) | |
1022 | * | |
1023 | * do_sys_execve asm fallback arguments: | |
1024 | * rdi: name, rsi: argv, rdx: envp, fake frame on the stack | |
1025 | */ | |
1026 | ENTRY(execve) | |
1027 | CFI_STARTPROC | |
1028 | FAKE_STACK_FRAME $0 | |
1029 | SAVE_ALL | |
1030 | call sys_execve | |
1031 | movq %rax, RAX(%rsp) | |
1032 | RESTORE_REST | |
1033 | testq %rax,%rax | |
1034 | je int_ret_from_sys_call | |
1035 | RESTORE_ARGS | |
1036 | UNFAKE_STACK_FRAME | |
1037 | ret | |
1038 | CFI_ENDPROC | |
4b787e0b | 1039 | ENDPROC(execve) |
1da177e4 | 1040 | |
0f2fbdcb | 1041 | KPROBE_ENTRY(page_fault) |
1da177e4 | 1042 | errorentry do_page_fault |
d28c4393 | 1043 | KPROBE_END(page_fault) |
1da177e4 LT |
1044 | |
1045 | ENTRY(coprocessor_error) | |
1046 | zeroentry do_coprocessor_error | |
4b787e0b | 1047 | END(coprocessor_error) |
1da177e4 LT |
1048 | |
1049 | ENTRY(simd_coprocessor_error) | |
1050 | zeroentry do_simd_coprocessor_error | |
4b787e0b | 1051 | END(simd_coprocessor_error) |
1da177e4 LT |
1052 | |
1053 | ENTRY(device_not_available) | |
1054 | zeroentry math_state_restore | |
4b787e0b | 1055 | END(device_not_available) |
1da177e4 LT |
1056 | |
1057 | /* runs on exception stack */ | |
0f2fbdcb | 1058 | KPROBE_ENTRY(debug) |
7effaa88 | 1059 | INTR_FRAME |
1da177e4 LT |
1060 | pushq $0 |
1061 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1062 | paranoidentry do_debug, DEBUG_STACK |
2601e64d | 1063 | paranoidexit |
d28c4393 | 1064 | KPROBE_END(debug) |
1da177e4 LT |
1065 | |
1066 | /* runs on exception stack */ | |
eddb6fb9 | 1067 | KPROBE_ENTRY(nmi) |
7effaa88 | 1068 | INTR_FRAME |
1da177e4 | 1069 | pushq $-1 |
7effaa88 | 1070 | CFI_ADJUST_CFA_OFFSET 8 |
2601e64d IM |
1071 | paranoidentry do_nmi, 0, 0 |
1072 | #ifdef CONFIG_TRACE_IRQFLAGS | |
1073 | paranoidexit 0 | |
1074 | #else | |
1075 | jmp paranoid_exit1 | |
1076 | CFI_ENDPROC | |
1077 | #endif | |
d28c4393 | 1078 | KPROBE_END(nmi) |
6fefb0d1 | 1079 | |
0f2fbdcb | 1080 | KPROBE_ENTRY(int3) |
b556b35e JB |
1081 | INTR_FRAME |
1082 | pushq $0 | |
1083 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1084 | paranoidentry do_int3, DEBUG_STACK |
2601e64d | 1085 | jmp paranoid_exit1 |
b556b35e | 1086 | CFI_ENDPROC |
d28c4393 | 1087 | KPROBE_END(int3) |
1da177e4 LT |
1088 | |
1089 | ENTRY(overflow) | |
1090 | zeroentry do_overflow | |
4b787e0b | 1091 | END(overflow) |
1da177e4 LT |
1092 | |
1093 | ENTRY(bounds) | |
1094 | zeroentry do_bounds | |
4b787e0b | 1095 | END(bounds) |
1da177e4 LT |
1096 | |
1097 | ENTRY(invalid_op) | |
1098 | zeroentry do_invalid_op | |
4b787e0b | 1099 | END(invalid_op) |
1da177e4 LT |
1100 | |
1101 | ENTRY(coprocessor_segment_overrun) | |
1102 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 1103 | END(coprocessor_segment_overrun) |
1da177e4 LT |
1104 | |
1105 | ENTRY(reserved) | |
1106 | zeroentry do_reserved | |
4b787e0b | 1107 | END(reserved) |
1da177e4 LT |
1108 | |
1109 | /* runs on exception stack */ | |
1110 | ENTRY(double_fault) | |
7effaa88 | 1111 | XCPT_FRAME |
1da177e4 | 1112 | paranoidentry do_double_fault |
2601e64d | 1113 | jmp paranoid_exit1 |
1da177e4 | 1114 | CFI_ENDPROC |
4b787e0b | 1115 | END(double_fault) |
1da177e4 LT |
1116 | |
1117 | ENTRY(invalid_TSS) | |
1118 | errorentry do_invalid_TSS | |
4b787e0b | 1119 | END(invalid_TSS) |
1da177e4 LT |
1120 | |
1121 | ENTRY(segment_not_present) | |
1122 | errorentry do_segment_not_present | |
4b787e0b | 1123 | END(segment_not_present) |
1da177e4 LT |
1124 | |
1125 | /* runs on exception stack */ | |
1126 | ENTRY(stack_segment) | |
7effaa88 | 1127 | XCPT_FRAME |
1da177e4 | 1128 | paranoidentry do_stack_segment |
2601e64d | 1129 | jmp paranoid_exit1 |
1da177e4 | 1130 | CFI_ENDPROC |
4b787e0b | 1131 | END(stack_segment) |
1da177e4 | 1132 | |
0f2fbdcb | 1133 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1134 | errorentry do_general_protection |
d28c4393 | 1135 | KPROBE_END(general_protection) |
1da177e4 LT |
1136 | |
1137 | ENTRY(alignment_check) | |
1138 | errorentry do_alignment_check | |
4b787e0b | 1139 | END(alignment_check) |
1da177e4 LT |
1140 | |
1141 | ENTRY(divide_error) | |
1142 | zeroentry do_divide_error | |
4b787e0b | 1143 | END(divide_error) |
1da177e4 LT |
1144 | |
1145 | ENTRY(spurious_interrupt_bug) | |
1146 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1147 | END(spurious_interrupt_bug) |
1da177e4 LT |
1148 | |
1149 | #ifdef CONFIG_X86_MCE | |
1150 | /* runs on exception stack */ | |
1151 | ENTRY(machine_check) | |
7effaa88 | 1152 | INTR_FRAME |
1da177e4 LT |
1153 | pushq $0 |
1154 | CFI_ADJUST_CFA_OFFSET 8 | |
1155 | paranoidentry do_machine_check | |
2601e64d | 1156 | jmp paranoid_exit1 |
1da177e4 | 1157 | CFI_ENDPROC |
4b787e0b | 1158 | END(machine_check) |
1da177e4 LT |
1159 | #endif |
1160 | ||
2699500b | 1161 | /* Call softirq on interrupt stack. Interrupts are off. */ |
ed6b676c | 1162 | ENTRY(call_softirq) |
7effaa88 | 1163 | CFI_STARTPROC |
2699500b AK |
1164 | push %rbp |
1165 | CFI_ADJUST_CFA_OFFSET 8 | |
1166 | CFI_REL_OFFSET rbp,0 | |
1167 | mov %rsp,%rbp | |
1168 | CFI_DEF_CFA_REGISTER rbp | |
ed6b676c | 1169 | incl %gs:pda_irqcount |
2699500b AK |
1170 | cmove %gs:pda_irqstackptr,%rsp |
1171 | push %rbp # backlink for old unwinder | |
ed6b676c | 1172 | call __do_softirq |
2699500b | 1173 | leaveq |
7effaa88 | 1174 | CFI_DEF_CFA_REGISTER rsp |
2699500b | 1175 | CFI_ADJUST_CFA_OFFSET -8 |
ed6b676c | 1176 | decl %gs:pda_irqcount |
ed6b676c | 1177 | ret |
7effaa88 | 1178 | CFI_ENDPROC |
4b787e0b | 1179 | ENDPROC(call_softirq) |
b538ed27 JB |
1180 | |
1181 | #ifdef CONFIG_STACK_UNWIND | |
1182 | ENTRY(arch_unwind_init_running) | |
1183 | CFI_STARTPROC | |
1184 | movq %r15, R15(%rdi) | |
1185 | movq %r14, R14(%rdi) | |
1186 | xchgq %rsi, %rdx | |
1187 | movq %r13, R13(%rdi) | |
1188 | movq %r12, R12(%rdi) | |
1189 | xorl %eax, %eax | |
1190 | movq %rbp, RBP(%rdi) | |
1191 | movq %rbx, RBX(%rdi) | |
1192 | movq (%rsp), %rcx | |
1193 | movq %rax, R11(%rdi) | |
1194 | movq %rax, R10(%rdi) | |
1195 | movq %rax, R9(%rdi) | |
1196 | movq %rax, R8(%rdi) | |
1197 | movq %rax, RAX(%rdi) | |
1198 | movq %rax, RCX(%rdi) | |
1199 | movq %rax, RDX(%rdi) | |
1200 | movq %rax, RSI(%rdi) | |
1201 | movq %rax, RDI(%rdi) | |
1202 | movq %rax, ORIG_RAX(%rdi) | |
1203 | movq %rcx, RIP(%rdi) | |
1204 | leaq 8(%rsp), %rcx | |
1205 | movq $__KERNEL_CS, CS(%rdi) | |
1206 | movq %rax, EFLAGS(%rdi) | |
1207 | movq %rcx, RSP(%rdi) | |
1208 | movq $__KERNEL_DS, SS(%rdi) | |
1209 | jmpq *%rdx | |
1210 | CFI_ENDPROC | |
1211 | ENDPROC(arch_unwind_init_running) | |
1212 | #endif |