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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. | |
0bd7b798 AH |
14 | * |
15 | * Normal syscalls and interrupts don't save a full stack frame, this is | |
1da177e4 | 16 | * only done for syscall tracing, signals or fork/exec et.al. |
0bd7b798 AH |
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. | |
1da177e4 | 21 | * - partial stack frame: partially saved registers upto R11. |
0bd7b798 | 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> |
72fe4858 | 53 | #include <asm/paravirt.h> |
395a59d0 | 54 | #include <asm/ftrace.h> |
1da177e4 | 55 | |
86a1c34a RM |
56 | /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
57 | #include <linux/elf-em.h> | |
58 | #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) | |
59 | #define __AUDIT_ARCH_64BIT 0x80000000 | |
60 | #define __AUDIT_ARCH_LE 0x40000000 | |
61 | ||
1da177e4 | 62 | .code64 |
dcd072e2 AH |
63 | /* |
64 | * Some macro's to hide the most frequently occuring CFI annotations. | |
65 | */ | |
14ae22ba | 66 | .macro pushq_cfi reg |
dcd072e2 AH |
67 | pushq \reg |
68 | CFI_ADJUST_CFA_OFFSET 8 | |
69 | .endm | |
70 | ||
14ae22ba | 71 | .macro popq_cfi reg |
dcd072e2 AH |
72 | popq \reg |
73 | CFI_ADJUST_CFA_OFFSET -8 | |
74 | .endm | |
75 | ||
14ae22ba | 76 | .macro movq_cfi reg offset=0 |
dcd072e2 AH |
77 | movq %\reg, \offset(%rsp) |
78 | CFI_REL_OFFSET \reg, \offset | |
79 | .endm | |
1da177e4 | 80 | |
c002a1e6 AH |
81 | .macro movq_cfi_restore offset reg |
82 | movq \offset(%rsp), %\reg | |
83 | CFI_RESTORE \reg | |
84 | .endm | |
85 | ||
606576ce | 86 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
87 | #ifdef CONFIG_DYNAMIC_FTRACE |
88 | ENTRY(mcount) | |
d61f82d0 SR |
89 | retq |
90 | END(mcount) | |
91 | ||
92 | ENTRY(ftrace_caller) | |
93 | ||
94 | /* taken from glibc */ | |
95 | subq $0x38, %rsp | |
96 | movq %rax, (%rsp) | |
97 | movq %rcx, 8(%rsp) | |
98 | movq %rdx, 16(%rsp) | |
99 | movq %rsi, 24(%rsp) | |
100 | movq %rdi, 32(%rsp) | |
101 | movq %r8, 40(%rsp) | |
102 | movq %r9, 48(%rsp) | |
103 | ||
104 | movq 0x38(%rsp), %rdi | |
105 | movq 8(%rbp), %rsi | |
395a59d0 | 106 | subq $MCOUNT_INSN_SIZE, %rdi |
d61f82d0 SR |
107 | |
108 | .globl ftrace_call | |
109 | ftrace_call: | |
110 | call ftrace_stub | |
111 | ||
112 | movq 48(%rsp), %r9 | |
113 | movq 40(%rsp), %r8 | |
114 | movq 32(%rsp), %rdi | |
115 | movq 24(%rsp), %rsi | |
116 | movq 16(%rsp), %rdx | |
117 | movq 8(%rsp), %rcx | |
118 | movq (%rsp), %rax | |
119 | addq $0x38, %rsp | |
120 | ||
121 | .globl ftrace_stub | |
122 | ftrace_stub: | |
123 | retq | |
124 | END(ftrace_caller) | |
125 | ||
126 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
16444a8a ACM |
127 | ENTRY(mcount) |
128 | cmpq $ftrace_stub, ftrace_trace_function | |
129 | jnz trace | |
130 | .globl ftrace_stub | |
131 | ftrace_stub: | |
132 | retq | |
133 | ||
134 | trace: | |
135 | /* taken from glibc */ | |
136 | subq $0x38, %rsp | |
137 | movq %rax, (%rsp) | |
138 | movq %rcx, 8(%rsp) | |
139 | movq %rdx, 16(%rsp) | |
140 | movq %rsi, 24(%rsp) | |
141 | movq %rdi, 32(%rsp) | |
142 | movq %r8, 40(%rsp) | |
143 | movq %r9, 48(%rsp) | |
144 | ||
145 | movq 0x38(%rsp), %rdi | |
146 | movq 8(%rbp), %rsi | |
395a59d0 | 147 | subq $MCOUNT_INSN_SIZE, %rdi |
16444a8a ACM |
148 | |
149 | call *ftrace_trace_function | |
150 | ||
151 | movq 48(%rsp), %r9 | |
152 | movq 40(%rsp), %r8 | |
153 | movq 32(%rsp), %rdi | |
154 | movq 24(%rsp), %rsi | |
155 | movq 16(%rsp), %rdx | |
156 | movq 8(%rsp), %rcx | |
157 | movq (%rsp), %rax | |
158 | addq $0x38, %rsp | |
159 | ||
160 | jmp ftrace_stub | |
161 | END(mcount) | |
d61f82d0 | 162 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 163 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 164 | |
dc37db4d | 165 | #ifndef CONFIG_PREEMPT |
1da177e4 | 166 | #define retint_kernel retint_restore_args |
0bd7b798 | 167 | #endif |
2601e64d | 168 | |
72fe4858 | 169 | #ifdef CONFIG_PARAVIRT |
2be29982 | 170 | ENTRY(native_usergs_sysret64) |
72fe4858 GOC |
171 | swapgs |
172 | sysretq | |
173 | #endif /* CONFIG_PARAVIRT */ | |
174 | ||
2601e64d IM |
175 | |
176 | .macro TRACE_IRQS_IRETQ offset=ARGOFFSET | |
177 | #ifdef CONFIG_TRACE_IRQFLAGS | |
178 | bt $9,EFLAGS-\offset(%rsp) /* interrupts off? */ | |
179 | jnc 1f | |
180 | TRACE_IRQS_ON | |
181 | 1: | |
182 | #endif | |
183 | .endm | |
184 | ||
1da177e4 | 185 | /* |
0bd7b798 AH |
186 | * C code is not supposed to know about undefined top of stack. Every time |
187 | * a C function with an pt_regs argument is called from the SYSCALL based | |
1da177e4 LT |
188 | * fast path FIXUP_TOP_OF_STACK is needed. |
189 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs | |
190 | * manipulation. | |
0bd7b798 AH |
191 | */ |
192 | ||
193 | /* %rsp:at FRAMEEND */ | |
c002a1e6 AH |
194 | .macro FIXUP_TOP_OF_STACK tmp offset=0 |
195 | movq %gs:pda_oldrsp,\tmp | |
196 | movq \tmp,RSP+\offset(%rsp) | |
197 | movq $__USER_DS,SS+\offset(%rsp) | |
198 | movq $__USER_CS,CS+\offset(%rsp) | |
199 | movq $-1,RCX+\offset(%rsp) | |
200 | movq R11+\offset(%rsp),\tmp /* get eflags */ | |
201 | movq \tmp,EFLAGS+\offset(%rsp) | |
1da177e4 LT |
202 | .endm |
203 | ||
c002a1e6 AH |
204 | .macro RESTORE_TOP_OF_STACK tmp offset=0 |
205 | movq RSP+\offset(%rsp),\tmp | |
206 | movq \tmp,%gs:pda_oldrsp | |
207 | movq EFLAGS+\offset(%rsp),\tmp | |
208 | movq \tmp,R11+\offset(%rsp) | |
1da177e4 LT |
209 | .endm |
210 | ||
211 | .macro FAKE_STACK_FRAME child_rip | |
212 | /* push in order ss, rsp, eflags, cs, rip */ | |
3829ee6b | 213 | xorl %eax, %eax |
e04e0a63 | 214 | pushq $__KERNEL_DS /* ss */ |
1da177e4 | 215 | CFI_ADJUST_CFA_OFFSET 8 |
7effaa88 | 216 | /*CFI_REL_OFFSET ss,0*/ |
1da177e4 LT |
217 | pushq %rax /* rsp */ |
218 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 219 | CFI_REL_OFFSET rsp,0 |
1da177e4 LT |
220 | pushq $(1<<9) /* eflags - interrupts on */ |
221 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 222 | /*CFI_REL_OFFSET rflags,0*/ |
1da177e4 LT |
223 | pushq $__KERNEL_CS /* cs */ |
224 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 225 | /*CFI_REL_OFFSET cs,0*/ |
1da177e4 LT |
226 | pushq \child_rip /* rip */ |
227 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 228 | CFI_REL_OFFSET rip,0 |
1da177e4 LT |
229 | pushq %rax /* orig rax */ |
230 | CFI_ADJUST_CFA_OFFSET 8 | |
231 | .endm | |
232 | ||
233 | .macro UNFAKE_STACK_FRAME | |
234 | addq $8*6, %rsp | |
235 | CFI_ADJUST_CFA_OFFSET -(6*8) | |
236 | .endm | |
237 | ||
dcd072e2 AH |
238 | /* |
239 | * initial frame state for interrupts (and exceptions without error code) | |
240 | */ | |
241 | .macro EMPTY_FRAME start=1 offset=0 | |
7effaa88 | 242 | .if \start |
dcd072e2 | 243 | CFI_STARTPROC simple |
adf14236 | 244 | CFI_SIGNAL_FRAME |
dcd072e2 | 245 | CFI_DEF_CFA rsp,8+\offset |
7effaa88 | 246 | .else |
dcd072e2 | 247 | CFI_DEF_CFA_OFFSET 8+\offset |
7effaa88 | 248 | .endif |
1da177e4 | 249 | .endm |
d99015b1 AH |
250 | |
251 | /* | |
dcd072e2 | 252 | * initial frame state for interrupts (and exceptions without error code) |
d99015b1 | 253 | */ |
dcd072e2 | 254 | .macro INTR_FRAME start=1 offset=0 |
e8a0e276 IM |
255 | EMPTY_FRAME \start, SS+8+\offset-RIP |
256 | /*CFI_REL_OFFSET ss, SS+\offset-RIP*/ | |
257 | CFI_REL_OFFSET rsp, RSP+\offset-RIP | |
258 | /*CFI_REL_OFFSET rflags, EFLAGS+\offset-RIP*/ | |
259 | /*CFI_REL_OFFSET cs, CS+\offset-RIP*/ | |
260 | CFI_REL_OFFSET rip, RIP+\offset-RIP | |
d99015b1 AH |
261 | .endm |
262 | ||
d99015b1 AH |
263 | /* |
264 | * initial frame state for exceptions with error code (and interrupts | |
265 | * with vector already pushed) | |
266 | */ | |
dcd072e2 | 267 | .macro XCPT_FRAME start=1 offset=0 |
e8a0e276 | 268 | INTR_FRAME \start, RIP+\offset-ORIG_RAX |
dcd072e2 AH |
269 | /*CFI_REL_OFFSET orig_rax, ORIG_RAX-ORIG_RAX*/ |
270 | .endm | |
271 | ||
272 | /* | |
273 | * frame that enables calling into C. | |
274 | */ | |
275 | .macro PARTIAL_FRAME start=1 offset=0 | |
e8a0e276 IM |
276 | XCPT_FRAME \start, ORIG_RAX+\offset-ARGOFFSET |
277 | CFI_REL_OFFSET rdi, RDI+\offset-ARGOFFSET | |
278 | CFI_REL_OFFSET rsi, RSI+\offset-ARGOFFSET | |
279 | CFI_REL_OFFSET rdx, RDX+\offset-ARGOFFSET | |
280 | CFI_REL_OFFSET rcx, RCX+\offset-ARGOFFSET | |
281 | CFI_REL_OFFSET rax, RAX+\offset-ARGOFFSET | |
282 | CFI_REL_OFFSET r8, R8+\offset-ARGOFFSET | |
283 | CFI_REL_OFFSET r9, R9+\offset-ARGOFFSET | |
284 | CFI_REL_OFFSET r10, R10+\offset-ARGOFFSET | |
285 | CFI_REL_OFFSET r11, R11+\offset-ARGOFFSET | |
dcd072e2 AH |
286 | .endm |
287 | ||
288 | /* | |
289 | * frame that enables passing a complete pt_regs to a C function. | |
290 | */ | |
291 | .macro DEFAULT_FRAME start=1 offset=0 | |
e8a0e276 | 292 | PARTIAL_FRAME \start, R11+\offset-R15 |
dcd072e2 AH |
293 | CFI_REL_OFFSET rbx, RBX+\offset |
294 | CFI_REL_OFFSET rbp, RBP+\offset | |
295 | CFI_REL_OFFSET r12, R12+\offset | |
296 | CFI_REL_OFFSET r13, R13+\offset | |
297 | CFI_REL_OFFSET r14, R14+\offset | |
298 | CFI_REL_OFFSET r15, R15+\offset | |
299 | .endm | |
d99015b1 AH |
300 | |
301 | /* save partial stack frame */ | |
302 | ENTRY(save_args) | |
303 | XCPT_FRAME | |
304 | cld | |
14ae22ba IM |
305 | movq_cfi rdi, RDI+16-ARGOFFSET |
306 | movq_cfi rsi, RSI+16-ARGOFFSET | |
307 | movq_cfi rdx, RDX+16-ARGOFFSET | |
308 | movq_cfi rcx, RCX+16-ARGOFFSET | |
309 | movq_cfi rax, RAX+16-ARGOFFSET | |
310 | movq_cfi r8, R8+16-ARGOFFSET | |
311 | movq_cfi r9, R9+16-ARGOFFSET | |
312 | movq_cfi r10, R10+16-ARGOFFSET | |
313 | movq_cfi r11, R11+16-ARGOFFSET | |
314 | ||
d99015b1 | 315 | leaq -ARGOFFSET+16(%rsp),%rdi /* arg1 for handler */ |
14ae22ba | 316 | movq_cfi rbp, 8 /* push %rbp */ |
d99015b1 AH |
317 | leaq 8(%rsp), %rbp /* mov %rsp, %ebp */ |
318 | testl $3, CS(%rdi) | |
319 | je 1f | |
320 | SWAPGS | |
321 | /* | |
322 | * irqcount is used to check if a CPU is already on an interrupt stack | |
323 | * or not. While this is essentially redundant with preempt_count it is | |
324 | * a little cheaper to use a separate counter in the PDA (short of | |
325 | * moving irq_enter into assembly, which would be too much work) | |
326 | */ | |
327 | 1: incl %gs:pda_irqcount | |
328 | jne 2f | |
14ae22ba | 329 | popq_cfi %rax /* move return address... */ |
d99015b1 | 330 | mov %gs:pda_irqstackptr,%rsp |
dcd072e2 | 331 | EMPTY_FRAME 0 |
14ae22ba | 332 | pushq_cfi %rax /* ... to the new stack */ |
d99015b1 AH |
333 | /* |
334 | * We entered an interrupt context - irqs are off: | |
335 | */ | |
336 | 2: TRACE_IRQS_OFF | |
337 | ret | |
338 | CFI_ENDPROC | |
339 | END(save_args) | |
340 | ||
c002a1e6 AH |
341 | ENTRY(save_rest) |
342 | PARTIAL_FRAME 1 REST_SKIP+8 | |
343 | movq 5*8+16(%rsp), %r11 /* save return address */ | |
344 | movq_cfi rbx, RBX+16 | |
345 | movq_cfi rbp, RBP+16 | |
346 | movq_cfi r12, R12+16 | |
347 | movq_cfi r13, R13+16 | |
348 | movq_cfi r14, R14+16 | |
349 | movq_cfi r15, R15+16 | |
350 | movq %r11, 8(%rsp) /* return address */ | |
351 | FIXUP_TOP_OF_STACK %r11, 16 | |
352 | ret | |
353 | CFI_ENDPROC | |
354 | END(save_rest) | |
355 | ||
e2f6bc25 AH |
356 | /* save complete stack frame */ |
357 | ENTRY(save_paranoid) | |
358 | XCPT_FRAME 1 RDI+8 | |
359 | cld | |
360 | movq_cfi rdi, RDI+8 | |
361 | movq_cfi rsi, RSI+8 | |
362 | movq_cfi rdx, RDX+8 | |
363 | movq_cfi rcx, RCX+8 | |
364 | movq_cfi rax, RAX+8 | |
365 | movq_cfi r8, R8+8 | |
366 | movq_cfi r9, R9+8 | |
367 | movq_cfi r10, R10+8 | |
368 | movq_cfi r11, R11+8 | |
369 | movq_cfi rbx, RBX+8 | |
370 | movq_cfi rbp, RBP+8 | |
371 | movq_cfi r12, R12+8 | |
372 | movq_cfi r13, R13+8 | |
373 | movq_cfi r14, R14+8 | |
374 | movq_cfi r15, R15+8 | |
375 | movl $1,%ebx | |
376 | movl $MSR_GS_BASE,%ecx | |
377 | rdmsr | |
378 | testl %edx,%edx | |
379 | js 1f /* negative -> in kernel */ | |
380 | SWAPGS | |
381 | xorl %ebx,%ebx | |
382 | 1: ret | |
383 | CFI_ENDPROC | |
384 | END(save_paranoid) | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * A newly forked process directly context switches into this. | |
0bd7b798 AH |
388 | */ |
389 | /* rdi: prev */ | |
1da177e4 | 390 | ENTRY(ret_from_fork) |
dcd072e2 | 391 | DEFAULT_FRAME |
658fdbef | 392 | push kernel_eflags(%rip) |
e0a5a5d9 | 393 | CFI_ADJUST_CFA_OFFSET 8 |
658fdbef | 394 | popf # reset kernel eflags |
e0a5a5d9 | 395 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
396 | call schedule_tail |
397 | GET_THREAD_INFO(%rcx) | |
26ccb8a7 | 398 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx) |
1da177e4 | 399 | jnz rff_trace |
0bd7b798 | 400 | rff_action: |
1da177e4 LT |
401 | RESTORE_REST |
402 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? | |
403 | je int_ret_from_sys_call | |
26ccb8a7 | 404 | testl $_TIF_IA32,TI_flags(%rcx) |
1da177e4 | 405 | jnz int_ret_from_sys_call |
c002a1e6 | 406 | RESTORE_TOP_OF_STACK %rdi, -ARGOFFSET |
1da177e4 LT |
407 | jmp ret_from_sys_call |
408 | rff_trace: | |
409 | movq %rsp,%rdi | |
410 | call syscall_trace_leave | |
0bd7b798 | 411 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
412 | jmp rff_action |
413 | CFI_ENDPROC | |
4b787e0b | 414 | END(ret_from_fork) |
1da177e4 LT |
415 | |
416 | /* | |
417 | * System call entry. Upto 6 arguments in registers are supported. | |
418 | * | |
419 | * SYSCALL does not save anything on the stack and does not change the | |
420 | * stack pointer. | |
421 | */ | |
0bd7b798 | 422 | |
1da177e4 | 423 | /* |
0bd7b798 | 424 | * Register setup: |
1da177e4 LT |
425 | * rax system call number |
426 | * rdi arg0 | |
0bd7b798 | 427 | * rcx return address for syscall/sysret, C arg3 |
1da177e4 | 428 | * rsi arg1 |
0bd7b798 | 429 | * rdx arg2 |
1da177e4 LT |
430 | * r10 arg3 (--> moved to rcx for C) |
431 | * r8 arg4 | |
432 | * r9 arg5 | |
433 | * r11 eflags for syscall/sysret, temporary for C | |
0bd7b798 AH |
434 | * r12-r15,rbp,rbx saved by C code, not touched. |
435 | * | |
1da177e4 LT |
436 | * Interrupts are off on entry. |
437 | * Only called from user space. | |
438 | * | |
439 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
440 | * and report it properly in ps. Unfortunately we haven't. | |
7bf36bbc AK |
441 | * |
442 | * When user can change the frames always force IRET. That is because | |
443 | * it deals with uncanonical addresses better. SYSRET has trouble | |
444 | * with them due to bugs in both AMD and Intel CPUs. | |
0bd7b798 | 445 | */ |
1da177e4 LT |
446 | |
447 | ENTRY(system_call) | |
7effaa88 | 448 | CFI_STARTPROC simple |
adf14236 | 449 | CFI_SIGNAL_FRAME |
dffead4e | 450 | CFI_DEF_CFA rsp,PDA_STACKOFFSET |
7effaa88 JB |
451 | CFI_REGISTER rip,rcx |
452 | /*CFI_REGISTER rflags,r11*/ | |
72fe4858 GOC |
453 | SWAPGS_UNSAFE_STACK |
454 | /* | |
455 | * A hypervisor implementation might want to use a label | |
456 | * after the swapgs, so that it can do the swapgs | |
457 | * for the guest and jump here on syscall. | |
458 | */ | |
459 | ENTRY(system_call_after_swapgs) | |
460 | ||
0bd7b798 | 461 | movq %rsp,%gs:pda_oldrsp |
1da177e4 | 462 | movq %gs:pda_kernelstack,%rsp |
2601e64d IM |
463 | /* |
464 | * No need to follow this irqs off/on section - it's straight | |
465 | * and short: | |
466 | */ | |
72fe4858 | 467 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 468 | SAVE_ARGS 8,1 |
0bd7b798 | 469 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) |
7effaa88 JB |
470 | movq %rcx,RIP-ARGOFFSET(%rsp) |
471 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 | 472 | GET_THREAD_INFO(%rcx) |
d4d67150 | 473 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%rcx) |
1da177e4 | 474 | jnz tracesys |
86a1c34a | 475 | system_call_fastpath: |
1da177e4 LT |
476 | cmpq $__NR_syscall_max,%rax |
477 | ja badsys | |
478 | movq %r10,%rcx | |
479 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
480 | movq %rax,RAX-ARGOFFSET(%rsp) | |
481 | /* | |
482 | * Syscall return path ending with SYSRET (fast path) | |
0bd7b798 AH |
483 | * Has incomplete stack frame and undefined top of stack. |
484 | */ | |
1da177e4 | 485 | ret_from_sys_call: |
11b854b2 | 486 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 | 487 | /* edi: flagmask */ |
0bd7b798 | 488 | sysret_check: |
10cd706d | 489 | LOCKDEP_SYS_EXIT |
1da177e4 | 490 | GET_THREAD_INFO(%rcx) |
72fe4858 | 491 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 492 | TRACE_IRQS_OFF |
26ccb8a7 | 493 | movl TI_flags(%rcx),%edx |
1da177e4 | 494 | andl %edi,%edx |
0bd7b798 | 495 | jnz sysret_careful |
bcddc015 | 496 | CFI_REMEMBER_STATE |
2601e64d IM |
497 | /* |
498 | * sysretq will re-enable interrupts: | |
499 | */ | |
500 | TRACE_IRQS_ON | |
1da177e4 | 501 | movq RIP-ARGOFFSET(%rsp),%rcx |
7effaa88 | 502 | CFI_REGISTER rip,rcx |
1da177e4 | 503 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 504 | /*CFI_REGISTER rflags,r11*/ |
c7245da6 | 505 | movq %gs:pda_oldrsp, %rsp |
2be29982 | 506 | USERGS_SYSRET64 |
1da177e4 | 507 | |
bcddc015 | 508 | CFI_RESTORE_STATE |
1da177e4 | 509 | /* Handle reschedules */ |
0bd7b798 | 510 | /* edx: work, edi: workmask */ |
1da177e4 LT |
511 | sysret_careful: |
512 | bt $TIF_NEED_RESCHED,%edx | |
513 | jnc sysret_signal | |
2601e64d | 514 | TRACE_IRQS_ON |
72fe4858 | 515 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 516 | pushq %rdi |
7effaa88 | 517 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
518 | call schedule |
519 | popq %rdi | |
7effaa88 | 520 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
521 | jmp sysret_check |
522 | ||
0bd7b798 | 523 | /* Handle a signal */ |
1da177e4 | 524 | sysret_signal: |
2601e64d | 525 | TRACE_IRQS_ON |
72fe4858 | 526 | ENABLE_INTERRUPTS(CLBR_NONE) |
86a1c34a RM |
527 | #ifdef CONFIG_AUDITSYSCALL |
528 | bt $TIF_SYSCALL_AUDIT,%edx | |
529 | jc sysret_audit | |
530 | #endif | |
10ffdbb8 | 531 | /* edx: work flags (arg3) */ |
1da177e4 LT |
532 | leaq do_notify_resume(%rip),%rax |
533 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
534 | xorl %esi,%esi # oldset -> arg2 | |
535 | call ptregscall_common | |
15e8f348 | 536 | movl $_TIF_WORK_MASK,%edi |
7bf36bbc AK |
537 | /* Use IRET because user could have changed frame. This |
538 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ | |
72fe4858 | 539 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 540 | TRACE_IRQS_OFF |
7bf36bbc | 541 | jmp int_with_check |
0bd7b798 | 542 | |
7effaa88 JB |
543 | badsys: |
544 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
545 | jmp ret_from_sys_call | |
546 | ||
86a1c34a RM |
547 | #ifdef CONFIG_AUDITSYSCALL |
548 | /* | |
549 | * Fast path for syscall audit without full syscall trace. | |
550 | * We just call audit_syscall_entry() directly, and then | |
551 | * jump back to the normal fast path. | |
552 | */ | |
553 | auditsys: | |
554 | movq %r10,%r9 /* 6th arg: 4th syscall arg */ | |
555 | movq %rdx,%r8 /* 5th arg: 3rd syscall arg */ | |
556 | movq %rsi,%rcx /* 4th arg: 2nd syscall arg */ | |
557 | movq %rdi,%rdx /* 3rd arg: 1st syscall arg */ | |
558 | movq %rax,%rsi /* 2nd arg: syscall number */ | |
559 | movl $AUDIT_ARCH_X86_64,%edi /* 1st arg: audit arch */ | |
560 | call audit_syscall_entry | |
561 | LOAD_ARGS 0 /* reload call-clobbered registers */ | |
562 | jmp system_call_fastpath | |
563 | ||
564 | /* | |
565 | * Return fast path for syscall audit. Call audit_syscall_exit() | |
566 | * directly and then jump back to the fast path with TIF_SYSCALL_AUDIT | |
567 | * masked off. | |
568 | */ | |
569 | sysret_audit: | |
570 | movq %rax,%rsi /* second arg, syscall return value */ | |
571 | cmpq $0,%rax /* is it < 0? */ | |
572 | setl %al /* 1 if so, 0 if not */ | |
573 | movzbl %al,%edi /* zero-extend that into %edi */ | |
574 | inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ | |
575 | call audit_syscall_exit | |
576 | movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi | |
577 | jmp sysret_check | |
578 | #endif /* CONFIG_AUDITSYSCALL */ | |
579 | ||
1da177e4 | 580 | /* Do syscall tracing */ |
0bd7b798 | 581 | tracesys: |
86a1c34a RM |
582 | #ifdef CONFIG_AUDITSYSCALL |
583 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx) | |
584 | jz auditsys | |
585 | #endif | |
1da177e4 | 586 | SAVE_REST |
a31f8dd7 | 587 | movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ |
1da177e4 LT |
588 | FIXUP_TOP_OF_STACK %rdi |
589 | movq %rsp,%rdi | |
590 | call syscall_trace_enter | |
d4d67150 RM |
591 | /* |
592 | * Reload arg registers from stack in case ptrace changed them. | |
593 | * We don't reload %rax because syscall_trace_enter() returned | |
594 | * the value it wants us to use in the table lookup. | |
595 | */ | |
596 | LOAD_ARGS ARGOFFSET, 1 | |
1da177e4 LT |
597 | RESTORE_REST |
598 | cmpq $__NR_syscall_max,%rax | |
a31f8dd7 | 599 | ja int_ret_from_sys_call /* RAX(%rsp) set to -ENOSYS above */ |
1da177e4 LT |
600 | movq %r10,%rcx /* fixup for C */ |
601 | call *sys_call_table(,%rax,8) | |
a31f8dd7 | 602 | movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc | 603 | /* Use IRET because user could have changed frame */ |
0bd7b798 AH |
604 | |
605 | /* | |
1da177e4 LT |
606 | * Syscall return path ending with IRET. |
607 | * Has correct top of stack, but partial stack frame. | |
bcddc015 JB |
608 | */ |
609 | .globl int_ret_from_sys_call | |
5cbf1565 | 610 | .globl int_with_check |
bcddc015 | 611 | int_ret_from_sys_call: |
72fe4858 | 612 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 613 | TRACE_IRQS_OFF |
1da177e4 LT |
614 | testl $3,CS-ARGOFFSET(%rsp) |
615 | je retint_restore_args | |
616 | movl $_TIF_ALLWORK_MASK,%edi | |
617 | /* edi: mask to check */ | |
618 | int_with_check: | |
10cd706d | 619 | LOCKDEP_SYS_EXIT_IRQ |
1da177e4 | 620 | GET_THREAD_INFO(%rcx) |
26ccb8a7 | 621 | movl TI_flags(%rcx),%edx |
1da177e4 LT |
622 | andl %edi,%edx |
623 | jnz int_careful | |
26ccb8a7 | 624 | andl $~TS_COMPAT,TI_status(%rcx) |
1da177e4 LT |
625 | jmp retint_swapgs |
626 | ||
627 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
628 | /* First do a reschedule test. */ | |
629 | /* edx: work, edi: workmask */ | |
630 | int_careful: | |
631 | bt $TIF_NEED_RESCHED,%edx | |
632 | jnc int_very_careful | |
2601e64d | 633 | TRACE_IRQS_ON |
72fe4858 | 634 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 635 | pushq %rdi |
7effaa88 | 636 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
637 | call schedule |
638 | popq %rdi | |
7effaa88 | 639 | CFI_ADJUST_CFA_OFFSET -8 |
72fe4858 | 640 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 641 | TRACE_IRQS_OFF |
1da177e4 LT |
642 | jmp int_with_check |
643 | ||
644 | /* handle signals and tracing -- both require a full stack frame */ | |
645 | int_very_careful: | |
2601e64d | 646 | TRACE_IRQS_ON |
72fe4858 | 647 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 648 | SAVE_REST |
0bd7b798 | 649 | /* Check for syscall exit trace */ |
d4d67150 | 650 | testl $_TIF_WORK_SYSCALL_EXIT,%edx |
1da177e4 LT |
651 | jz int_signal |
652 | pushq %rdi | |
7effaa88 | 653 | CFI_ADJUST_CFA_OFFSET 8 |
0bd7b798 | 654 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
1da177e4 LT |
655 | call syscall_trace_leave |
656 | popq %rdi | |
7effaa88 | 657 | CFI_ADJUST_CFA_OFFSET -8 |
d4d67150 | 658 | andl $~(_TIF_WORK_SYSCALL_EXIT|_TIF_SYSCALL_EMU),%edi |
1da177e4 | 659 | jmp int_restore_rest |
0bd7b798 | 660 | |
1da177e4 | 661 | int_signal: |
8f4d37ec | 662 | testl $_TIF_DO_NOTIFY_MASK,%edx |
1da177e4 LT |
663 | jz 1f |
664 | movq %rsp,%rdi # &ptregs -> arg1 | |
665 | xorl %esi,%esi # oldset -> arg2 | |
666 | call do_notify_resume | |
eca91e78 | 667 | 1: movl $_TIF_WORK_MASK,%edi |
1da177e4 LT |
668 | int_restore_rest: |
669 | RESTORE_REST | |
72fe4858 | 670 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 671 | TRACE_IRQS_OFF |
1da177e4 LT |
672 | jmp int_with_check |
673 | CFI_ENDPROC | |
bcddc015 | 674 | END(system_call) |
0bd7b798 AH |
675 | |
676 | /* | |
1da177e4 | 677 | * Certain special system calls that need to save a complete full stack frame. |
0bd7b798 | 678 | */ |
1da177e4 | 679 | .macro PTREGSCALL label,func,arg |
c002a1e6 AH |
680 | ENTRY(\label) |
681 | PARTIAL_FRAME 1 8 /* offset 8: return address */ | |
682 | subq $REST_SKIP, %rsp | |
683 | CFI_ADJUST_CFA_OFFSET REST_SKIP | |
684 | call save_rest | |
685 | DEFAULT_FRAME 0 8 /* offset 8: return address */ | |
686 | leaq 8(%rsp), \arg /* pt_regs pointer */ | |
687 | call \func | |
688 | jmp ptregscall_common | |
689 | CFI_ENDPROC | |
4b787e0b | 690 | END(\label) |
1da177e4 LT |
691 | .endm |
692 | ||
693 | PTREGSCALL stub_clone, sys_clone, %r8 | |
694 | PTREGSCALL stub_fork, sys_fork, %rdi | |
695 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
1da177e4 LT |
696 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx |
697 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
698 | ||
699 | ENTRY(ptregscall_common) | |
c002a1e6 AH |
700 | DEFAULT_FRAME 1 8 /* offset 8: return address */ |
701 | RESTORE_TOP_OF_STACK %r11, 8 | |
702 | movq_cfi_restore R15+8, r15 | |
703 | movq_cfi_restore R14+8, r14 | |
704 | movq_cfi_restore R13+8, r13 | |
705 | movq_cfi_restore R12+8, r12 | |
706 | movq_cfi_restore RBP+8, rbp | |
707 | movq_cfi_restore RBX+8, rbx | |
708 | ret $REST_SKIP /* pop extended registers */ | |
1da177e4 | 709 | CFI_ENDPROC |
4b787e0b | 710 | END(ptregscall_common) |
0bd7b798 | 711 | |
1da177e4 LT |
712 | ENTRY(stub_execve) |
713 | CFI_STARTPROC | |
714 | popq %r11 | |
7effaa88 JB |
715 | CFI_ADJUST_CFA_OFFSET -8 |
716 | CFI_REGISTER rip, r11 | |
1da177e4 | 717 | SAVE_REST |
1da177e4 | 718 | FIXUP_TOP_OF_STACK %r11 |
5d119b2c | 719 | movq %rsp, %rcx |
1da177e4 | 720 | call sys_execve |
1da177e4 | 721 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
722 | movq %rax,RAX(%rsp) |
723 | RESTORE_REST | |
724 | jmp int_ret_from_sys_call | |
725 | CFI_ENDPROC | |
4b787e0b | 726 | END(stub_execve) |
0bd7b798 | 727 | |
1da177e4 LT |
728 | /* |
729 | * sigreturn is special because it needs to restore all registers on return. | |
730 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
0bd7b798 | 731 | */ |
1da177e4 LT |
732 | ENTRY(stub_rt_sigreturn) |
733 | CFI_STARTPROC | |
7effaa88 JB |
734 | addq $8, %rsp |
735 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
736 | SAVE_REST |
737 | movq %rsp,%rdi | |
738 | FIXUP_TOP_OF_STACK %r11 | |
739 | call sys_rt_sigreturn | |
740 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
741 | RESTORE_REST | |
742 | jmp int_ret_from_sys_call | |
743 | CFI_ENDPROC | |
4b787e0b | 744 | END(stub_rt_sigreturn) |
1da177e4 | 745 | |
939b7871 PA |
746 | /* |
747 | * Build the entry stubs and pointer table with some assembler magic. | |
748 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
749 | * single cache line on all modern x86 implementations. | |
750 | */ | |
751 | .section .init.rodata,"a" | |
752 | ENTRY(interrupt) | |
753 | .text | |
754 | .p2align 5 | |
755 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
756 | ENTRY(irq_entries_start) | |
757 | INTR_FRAME | |
758 | vector=FIRST_EXTERNAL_VECTOR | |
759 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 | |
760 | .balign 32 | |
761 | .rept 7 | |
762 | .if vector < NR_VECTORS | |
8665596e | 763 | .if vector <> FIRST_EXTERNAL_VECTOR |
939b7871 PA |
764 | CFI_ADJUST_CFA_OFFSET -8 |
765 | .endif | |
766 | 1: pushq $(~vector+0x80) /* Note: always in signed byte range */ | |
767 | CFI_ADJUST_CFA_OFFSET 8 | |
8665596e | 768 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
939b7871 PA |
769 | jmp 2f |
770 | .endif | |
771 | .previous | |
772 | .quad 1b | |
773 | .text | |
774 | vector=vector+1 | |
775 | .endif | |
776 | .endr | |
777 | 2: jmp common_interrupt | |
778 | .endr | |
779 | CFI_ENDPROC | |
780 | END(irq_entries_start) | |
781 | ||
782 | .previous | |
783 | END(interrupt) | |
784 | .previous | |
785 | ||
d99015b1 | 786 | /* |
1da177e4 LT |
787 | * Interrupt entry/exit. |
788 | * | |
789 | * Interrupt entry points save only callee clobbered registers in fast path. | |
d99015b1 AH |
790 | * |
791 | * Entry runs with interrupts off. | |
792 | */ | |
1da177e4 | 793 | |
722024db | 794 | /* 0(%rsp): ~(interrupt number) */ |
1da177e4 | 795 | .macro interrupt func |
d99015b1 AH |
796 | subq $10*8, %rsp |
797 | CFI_ADJUST_CFA_OFFSET 10*8 | |
798 | call save_args | |
dcd072e2 | 799 | PARTIAL_FRAME 0 |
1da177e4 LT |
800 | call \func |
801 | .endm | |
802 | ||
722024db AH |
803 | /* |
804 | * The interrupt stubs push (~vector+0x80) onto the stack and | |
805 | * then jump to common_interrupt. | |
806 | */ | |
939b7871 PA |
807 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
808 | common_interrupt: | |
7effaa88 | 809 | XCPT_FRAME |
722024db | 810 | addq $-0x80,(%rsp) /* Adjust vector to [-256,-1] range */ |
1da177e4 LT |
811 | interrupt do_IRQ |
812 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 813 | ret_from_intr: |
72fe4858 | 814 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 815 | TRACE_IRQS_OFF |
3829ee6b | 816 | decl %gs:pda_irqcount |
1de9c3f6 | 817 | leaveq |
7effaa88 | 818 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 819 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 820 | exit_intr: |
1da177e4 LT |
821 | GET_THREAD_INFO(%rcx) |
822 | testl $3,CS-ARGOFFSET(%rsp) | |
823 | je retint_kernel | |
0bd7b798 | 824 | |
1da177e4 LT |
825 | /* Interrupt came from user space */ |
826 | /* | |
827 | * Has a correct top of stack, but a partial stack frame | |
828 | * %rcx: thread info. Interrupts off. | |
0bd7b798 | 829 | */ |
1da177e4 LT |
830 | retint_with_reschedule: |
831 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 832 | retint_check: |
10cd706d | 833 | LOCKDEP_SYS_EXIT_IRQ |
26ccb8a7 | 834 | movl TI_flags(%rcx),%edx |
1da177e4 | 835 | andl %edi,%edx |
7effaa88 | 836 | CFI_REMEMBER_STATE |
1da177e4 | 837 | jnz retint_careful |
10cd706d PZ |
838 | |
839 | retint_swapgs: /* return to user-space */ | |
2601e64d IM |
840 | /* |
841 | * The iretq could re-enable interrupts: | |
842 | */ | |
72fe4858 | 843 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d | 844 | TRACE_IRQS_IRETQ |
72fe4858 | 845 | SWAPGS |
2601e64d IM |
846 | jmp restore_args |
847 | ||
10cd706d | 848 | retint_restore_args: /* return to kernel space */ |
72fe4858 | 849 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d IM |
850 | /* |
851 | * The iretq could re-enable interrupts: | |
852 | */ | |
853 | TRACE_IRQS_IRETQ | |
854 | restore_args: | |
3701d863 IM |
855 | RESTORE_ARGS 0,8,0 |
856 | ||
f7f3d791 | 857 | irq_return: |
72fe4858 | 858 | INTERRUPT_RETURN |
3701d863 IM |
859 | |
860 | .section __ex_table, "a" | |
861 | .quad irq_return, bad_iret | |
862 | .previous | |
863 | ||
864 | #ifdef CONFIG_PARAVIRT | |
72fe4858 | 865 | ENTRY(native_iret) |
1da177e4 LT |
866 | iretq |
867 | ||
868 | .section __ex_table,"a" | |
72fe4858 | 869 | .quad native_iret, bad_iret |
1da177e4 | 870 | .previous |
3701d863 IM |
871 | #endif |
872 | ||
1da177e4 | 873 | .section .fixup,"ax" |
1da177e4 | 874 | bad_iret: |
3aa4b37d RM |
875 | /* |
876 | * The iret traps when the %cs or %ss being restored is bogus. | |
877 | * We've lost the original trap vector and error code. | |
878 | * #GPF is the most likely one to get for an invalid selector. | |
879 | * So pretend we completed the iret and took the #GPF in user mode. | |
880 | * | |
881 | * We are now running with the kernel GS after exception recovery. | |
882 | * But error_entry expects us to have user GS to match the user %cs, | |
883 | * so swap back. | |
884 | */ | |
885 | pushq $0 | |
886 | ||
887 | SWAPGS | |
888 | jmp general_protection | |
889 | ||
72fe4858 GOC |
890 | .previous |
891 | ||
7effaa88 | 892 | /* edi: workmask, edx: work */ |
1da177e4 | 893 | retint_careful: |
7effaa88 | 894 | CFI_RESTORE_STATE |
1da177e4 LT |
895 | bt $TIF_NEED_RESCHED,%edx |
896 | jnc retint_signal | |
2601e64d | 897 | TRACE_IRQS_ON |
72fe4858 | 898 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 899 | pushq %rdi |
7effaa88 | 900 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 901 | call schedule |
0bd7b798 | 902 | popq %rdi |
7effaa88 | 903 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 904 | GET_THREAD_INFO(%rcx) |
72fe4858 | 905 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 906 | TRACE_IRQS_OFF |
1da177e4 | 907 | jmp retint_check |
0bd7b798 | 908 | |
1da177e4 | 909 | retint_signal: |
8f4d37ec | 910 | testl $_TIF_DO_NOTIFY_MASK,%edx |
10ffdbb8 | 911 | jz retint_swapgs |
2601e64d | 912 | TRACE_IRQS_ON |
72fe4858 | 913 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 914 | SAVE_REST |
0bd7b798 | 915 | movq $-1,ORIG_RAX(%rsp) |
3829ee6b | 916 | xorl %esi,%esi # oldset |
1da177e4 LT |
917 | movq %rsp,%rdi # &pt_regs |
918 | call do_notify_resume | |
919 | RESTORE_REST | |
72fe4858 | 920 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 921 | TRACE_IRQS_OFF |
be9e6870 | 922 | GET_THREAD_INFO(%rcx) |
eca91e78 | 923 | jmp retint_with_reschedule |
1da177e4 LT |
924 | |
925 | #ifdef CONFIG_PREEMPT | |
926 | /* Returning to kernel space. Check if we need preemption */ | |
927 | /* rcx: threadinfo. interrupts off. */ | |
b06babac | 928 | ENTRY(retint_kernel) |
26ccb8a7 | 929 | cmpl $0,TI_preempt_count(%rcx) |
1da177e4 | 930 | jnz retint_restore_args |
26ccb8a7 | 931 | bt $TIF_NEED_RESCHED,TI_flags(%rcx) |
1da177e4 LT |
932 | jnc retint_restore_args |
933 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
934 | jnc retint_restore_args | |
935 | call preempt_schedule_irq | |
936 | jmp exit_intr | |
0bd7b798 | 937 | #endif |
4b787e0b | 938 | |
1da177e4 | 939 | CFI_ENDPROC |
4b787e0b | 940 | END(common_interrupt) |
0bd7b798 | 941 | |
1da177e4 LT |
942 | /* |
943 | * APIC interrupts. | |
0bd7b798 | 944 | */ |
d99015b1 AH |
945 | .p2align 5 |
946 | ||
1da177e4 | 947 | .macro apicinterrupt num,func |
7effaa88 | 948 | INTR_FRAME |
19eadf98 | 949 | pushq $~(\num) |
7effaa88 | 950 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
951 | interrupt \func |
952 | jmp ret_from_intr | |
953 | CFI_ENDPROC | |
954 | .endm | |
955 | ||
956 | ENTRY(thermal_interrupt) | |
957 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 958 | END(thermal_interrupt) |
1da177e4 | 959 | |
89b831ef JS |
960 | ENTRY(threshold_interrupt) |
961 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 962 | END(threshold_interrupt) |
89b831ef | 963 | |
0bd7b798 | 964 | #ifdef CONFIG_SMP |
1da177e4 LT |
965 | ENTRY(reschedule_interrupt) |
966 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 967 | END(reschedule_interrupt) |
1da177e4 | 968 | |
e5bc8b6b AK |
969 | .macro INVALIDATE_ENTRY num |
970 | ENTRY(invalidate_interrupt\num) | |
0bd7b798 | 971 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt |
4b787e0b | 972 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
973 | .endm |
974 | ||
975 | INVALIDATE_ENTRY 0 | |
976 | INVALIDATE_ENTRY 1 | |
977 | INVALIDATE_ENTRY 2 | |
978 | INVALIDATE_ENTRY 3 | |
979 | INVALIDATE_ENTRY 4 | |
980 | INVALIDATE_ENTRY 5 | |
981 | INVALIDATE_ENTRY 6 | |
982 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
983 | |
984 | ENTRY(call_function_interrupt) | |
985 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 986 | END(call_function_interrupt) |
3b16cf87 JA |
987 | ENTRY(call_function_single_interrupt) |
988 | apicinterrupt CALL_FUNCTION_SINGLE_VECTOR,smp_call_function_single_interrupt | |
989 | END(call_function_single_interrupt) | |
61014292 EB |
990 | ENTRY(irq_move_cleanup_interrupt) |
991 | apicinterrupt IRQ_MOVE_CLEANUP_VECTOR,smp_irq_move_cleanup_interrupt | |
992 | END(irq_move_cleanup_interrupt) | |
1da177e4 LT |
993 | #endif |
994 | ||
1da177e4 LT |
995 | ENTRY(apic_timer_interrupt) |
996 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 997 | END(apic_timer_interrupt) |
1da177e4 | 998 | |
1812924b CW |
999 | ENTRY(uv_bau_message_intr1) |
1000 | apicinterrupt 220,uv_bau_message_interrupt | |
1001 | END(uv_bau_message_intr1) | |
1002 | ||
1da177e4 LT |
1003 | ENTRY(error_interrupt) |
1004 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 1005 | END(error_interrupt) |
1da177e4 LT |
1006 | |
1007 | ENTRY(spurious_interrupt) | |
1008 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 1009 | END(spurious_interrupt) |
0bd7b798 | 1010 | |
1da177e4 LT |
1011 | /* |
1012 | * Exception entry points. | |
0bd7b798 | 1013 | */ |
1da177e4 | 1014 | .macro zeroentry sym |
7effaa88 | 1015 | INTR_FRAME |
fab58420 | 1016 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
14ae22ba | 1017 | pushq_cfi $-1 /* ORIG_RAX: no syscall to restart */ |
d99015b1 AH |
1018 | subq $15*8,%rsp |
1019 | CFI_ADJUST_CFA_OFFSET 15*8 | |
1020 | call error_entry | |
dcd072e2 | 1021 | DEFAULT_FRAME 0 |
d99015b1 AH |
1022 | movq %rsp,%rdi /* pt_regs pointer */ |
1023 | xorl %esi,%esi /* no error code */ | |
1024 | call \sym | |
1025 | jmp error_exit /* %ebx: no swapgs flag */ | |
7effaa88 | 1026 | CFI_ENDPROC |
0bd7b798 | 1027 | .endm |
1da177e4 LT |
1028 | |
1029 | .macro errorentry sym | |
7effaa88 | 1030 | XCPT_FRAME |
fab58420 | 1031 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
d99015b1 AH |
1032 | subq $15*8,%rsp |
1033 | CFI_ADJUST_CFA_OFFSET 15*8 | |
1034 | call error_entry | |
dcd072e2 | 1035 | DEFAULT_FRAME 0 |
d99015b1 AH |
1036 | movq %rsp,%rdi /* pt_regs pointer */ |
1037 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
1038 | movq $-1,ORIG_RAX(%rsp) /* no syscall to restart */ | |
1039 | call \sym | |
1040 | jmp error_exit /* %ebx: no swapgs flag */ | |
7effaa88 | 1041 | CFI_ENDPROC |
1da177e4 LT |
1042 | .endm |
1043 | ||
1044 | /* error code is on the stack already */ | |
e2f6bc25 AH |
1045 | .macro paranoidentry sym ist=0 |
1046 | subq $15*8, %rsp | |
1047 | CFI_ADJUST_CFA_OFFSET 15*8 | |
1048 | call save_paranoid | |
1049 | DEFAULT_FRAME 0 | |
b556b35e JB |
1050 | .if \ist |
1051 | movq %gs:pda_data_offset, %rbp | |
1052 | .endif | |
7e61a793 | 1053 | TRACE_IRQS_OFF |
b556b35e | 1054 | movq %rsp,%rdi |
1da177e4 LT |
1055 | movq ORIG_RAX(%rsp),%rsi |
1056 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 1057 | .if \ist |
5f8efbb9 | 1058 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 1059 | .endif |
1da177e4 | 1060 | call \sym |
b556b35e | 1061 | .if \ist |
5f8efbb9 | 1062 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 1063 | .endif |
72fe4858 | 1064 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 1065 | TRACE_IRQS_OFF |
1da177e4 | 1066 | .endm |
2601e64d IM |
1067 | |
1068 | /* | |
1069 | * "Paranoid" exit path from exception stack. | |
1070 | * Paranoid because this is used by NMIs and cannot take | |
1071 | * any kernel state for granted. | |
1072 | * We don't do kernel preemption checks here, because only | |
1073 | * NMI should be common and it does not enable IRQs and | |
1074 | * cannot get reschedule ticks. | |
1075 | * | |
1076 | * "trace" is 0 for the NMI handler only, because irq-tracing | |
1077 | * is fundamentally NMI-unsafe. (we cannot change the soft and | |
1078 | * hard flags at once, atomically) | |
1079 | */ | |
e2f6bc25 | 1080 | |
2601e64d | 1081 | /* ebx: no swapgs flag */ |
e2f6bc25 AH |
1082 | KPROBE_ENTRY(paranoid_exit) |
1083 | INTR_FRAME | |
2601e64d | 1084 | testl %ebx,%ebx /* swapgs needed? */ |
e2f6bc25 | 1085 | jnz paranoid_restore |
2601e64d | 1086 | testl $3,CS(%rsp) |
e2f6bc25 AH |
1087 | jnz paranoid_userspace |
1088 | paranoid_swapgs: | |
2601e64d | 1089 | TRACE_IRQS_IRETQ 0 |
72fe4858 | 1090 | SWAPGS_UNSAFE_STACK |
e2f6bc25 | 1091 | paranoid_restore: |
2601e64d | 1092 | RESTORE_ALL 8 |
3701d863 | 1093 | jmp irq_return |
e2f6bc25 | 1094 | paranoid_userspace: |
2601e64d | 1095 | GET_THREAD_INFO(%rcx) |
26ccb8a7 | 1096 | movl TI_flags(%rcx),%ebx |
2601e64d | 1097 | andl $_TIF_WORK_MASK,%ebx |
e2f6bc25 | 1098 | jz paranoid_swapgs |
2601e64d IM |
1099 | movq %rsp,%rdi /* &pt_regs */ |
1100 | call sync_regs | |
1101 | movq %rax,%rsp /* switch stack for scheduling */ | |
1102 | testl $_TIF_NEED_RESCHED,%ebx | |
e2f6bc25 | 1103 | jnz paranoid_schedule |
2601e64d | 1104 | movl %ebx,%edx /* arg3: thread flags */ |
2601e64d | 1105 | TRACE_IRQS_ON |
72fe4858 | 1106 | ENABLE_INTERRUPTS(CLBR_NONE) |
2601e64d IM |
1107 | xorl %esi,%esi /* arg2: oldset */ |
1108 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1109 | call do_notify_resume | |
72fe4858 | 1110 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 1111 | TRACE_IRQS_OFF |
e2f6bc25 AH |
1112 | jmp paranoid_userspace |
1113 | paranoid_schedule: | |
2601e64d | 1114 | TRACE_IRQS_ON |
72fe4858 | 1115 | ENABLE_INTERRUPTS(CLBR_ANY) |
2601e64d | 1116 | call schedule |
72fe4858 | 1117 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d | 1118 | TRACE_IRQS_OFF |
e2f6bc25 | 1119 | jmp paranoid_userspace |
2601e64d | 1120 | CFI_ENDPROC |
e2f6bc25 | 1121 | END(paranoid_exit) |
2601e64d | 1122 | |
1da177e4 | 1123 | /* |
d99015b1 AH |
1124 | * Exception entry point. This expects an error code/orig_rax on the stack. |
1125 | * returns in "no swapgs flag" in %ebx. | |
0bd7b798 | 1126 | */ |
d28c4393 | 1127 | KPROBE_ENTRY(error_entry) |
dcd072e2 | 1128 | XCPT_FRAME |
d99015b1 AH |
1129 | CFI_ADJUST_CFA_OFFSET 15*8 |
1130 | /* oldrax contains error code */ | |
0bd7b798 | 1131 | cld |
14ae22ba IM |
1132 | movq_cfi rdi, RDI+8 |
1133 | movq_cfi rsi, RSI+8 | |
1134 | movq_cfi rdx, RDX+8 | |
1135 | movq_cfi rcx, RCX+8 | |
1136 | movq_cfi rax, RAX+8 | |
1137 | movq_cfi r8, R8+8 | |
1138 | movq_cfi r9, R9+8 | |
1139 | movq_cfi r10, R10+8 | |
1140 | movq_cfi r11, R11+8 | |
1141 | movq_cfi rbx, RBX+8 | |
1142 | movq_cfi rbp, RBP+8 | |
1143 | movq_cfi r12, R12+8 | |
1144 | movq_cfi r13, R13+8 | |
1145 | movq_cfi r14, R14+8 | |
1146 | movq_cfi r15, R15+8 | |
0bd7b798 | 1147 | xorl %ebx,%ebx |
d99015b1 AH |
1148 | testl $3,CS+8(%rsp) |
1149 | je error_kernelspace | |
0bd7b798 | 1150 | error_swapgs: |
72fe4858 | 1151 | SWAPGS |
6b11d4ef AH |
1152 | error_sti: |
1153 | TRACE_IRQS_OFF | |
d99015b1 AH |
1154 | ret |
1155 | CFI_ENDPROC | |
1156 | ||
1157 | /* | |
1158 | * There are two places in the kernel that can potentially fault with | |
1159 | * usergs. Handle them here. The exception handlers after iret run with | |
1160 | * kernel gs again, so don't set the user space flag. B stepping K8s | |
1161 | * sometimes report an truncated RIP for IRET exceptions returning to | |
1162 | * compat mode. Check for these here too. | |
1163 | */ | |
1164 | error_kernelspace: | |
1165 | incl %ebx | |
1166 | leaq irq_return(%rip),%rcx | |
1167 | cmpq %rcx,RIP+8(%rsp) | |
1168 | je error_swapgs | |
1169 | movl %ecx,%ecx /* zero extend */ | |
1170 | cmpq %rcx,RIP+8(%rsp) | |
1171 | je error_swapgs | |
1172 | cmpq $gs_change,RIP+8(%rsp) | |
1173 | je error_swapgs | |
1174 | jmp error_sti | |
1175 | KPROBE_END(error_entry) | |
1176 | ||
1177 | ||
1178 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
1179 | KPROBE_ENTRY(error_exit) | |
dcd072e2 | 1180 | DEFAULT_FRAME |
10cd706d | 1181 | movl %ebx,%eax |
1da177e4 | 1182 | RESTORE_REST |
72fe4858 | 1183 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 1184 | TRACE_IRQS_OFF |
0bd7b798 | 1185 | GET_THREAD_INFO(%rcx) |
1da177e4 | 1186 | testl %eax,%eax |
d99015b1 | 1187 | jne retint_kernel |
10cd706d | 1188 | LOCKDEP_SYS_EXIT_IRQ |
d99015b1 AH |
1189 | movl TI_flags(%rcx),%edx |
1190 | movl $_TIF_WORK_MASK,%edi | |
1191 | andl %edi,%edx | |
1192 | jnz retint_careful | |
10cd706d | 1193 | jmp retint_swapgs |
1da177e4 | 1194 | CFI_ENDPROC |
d99015b1 | 1195 | KPROBE_END(error_exit) |
0bd7b798 | 1196 | |
1da177e4 | 1197 | /* Reload gs selector with exception handling */ |
0bd7b798 | 1198 | /* edi: new selector */ |
9f9d489a | 1199 | ENTRY(native_load_gs_index) |
7effaa88 | 1200 | CFI_STARTPROC |
1da177e4 | 1201 | pushf |
7effaa88 | 1202 | CFI_ADJUST_CFA_OFFSET 8 |
72fe4858 GOC |
1203 | DISABLE_INTERRUPTS(CLBR_ANY | ~(CLBR_RDI)) |
1204 | SWAPGS | |
0bd7b798 AH |
1205 | gs_change: |
1206 | movl %edi,%gs | |
1da177e4 | 1207 | 2: mfence /* workaround */ |
72fe4858 | 1208 | SWAPGS |
1da177e4 | 1209 | popf |
7effaa88 | 1210 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 1211 | ret |
7effaa88 | 1212 | CFI_ENDPROC |
9f9d489a | 1213 | ENDPROC(native_load_gs_index) |
0bd7b798 | 1214 | |
1da177e4 LT |
1215 | .section __ex_table,"a" |
1216 | .align 8 | |
1217 | .quad gs_change,bad_gs | |
1218 | .previous | |
1219 | .section .fixup,"ax" | |
1220 | /* running with kernelgs */ | |
0bd7b798 | 1221 | bad_gs: |
72fe4858 | 1222 | SWAPGS /* switch back to user gs */ |
1da177e4 LT |
1223 | xorl %eax,%eax |
1224 | movl %eax,%gs | |
1225 | jmp 2b | |
0bd7b798 AH |
1226 | .previous |
1227 | ||
1da177e4 LT |
1228 | /* |
1229 | * Create a kernel thread. | |
1230 | * | |
1231 | * C extern interface: | |
1232 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
1233 | * | |
1234 | * asm input arguments: | |
1235 | * rdi: fn, rsi: arg, rdx: flags | |
1236 | */ | |
1237 | ENTRY(kernel_thread) | |
1238 | CFI_STARTPROC | |
1239 | FAKE_STACK_FRAME $child_rip | |
1240 | SAVE_ALL | |
1241 | ||
1242 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
1243 | movq %rdx,%rdi | |
1244 | orq kernel_thread_flags(%rip),%rdi | |
1245 | movq $-1, %rsi | |
1246 | movq %rsp, %rdx | |
1247 | ||
1248 | xorl %r8d,%r8d | |
1249 | xorl %r9d,%r9d | |
0bd7b798 | 1250 | |
1da177e4 LT |
1251 | # clone now |
1252 | call do_fork | |
1253 | movq %rax,RAX(%rsp) | |
1254 | xorl %edi,%edi | |
1255 | ||
1256 | /* | |
1257 | * It isn't worth to check for reschedule here, | |
1258 | * so internally to the x86_64 port you can rely on kernel_thread() | |
1259 | * not to reschedule the child before returning, this avoids the need | |
1260 | * of hacks for example to fork off the per-CPU idle tasks. | |
0bd7b798 | 1261 | * [Hopefully no generic code relies on the reschedule -AK] |
1da177e4 LT |
1262 | */ |
1263 | RESTORE_ALL | |
1264 | UNFAKE_STACK_FRAME | |
1265 | ret | |
1266 | CFI_ENDPROC | |
4b787e0b | 1267 | ENDPROC(kernel_thread) |
0bd7b798 | 1268 | |
1da177e4 | 1269 | child_rip: |
c05991ed AK |
1270 | pushq $0 # fake return address |
1271 | CFI_STARTPROC | |
1da177e4 LT |
1272 | /* |
1273 | * Here we are in the child and the registers are set as they were | |
1274 | * at kernel_thread() invocation in the parent. | |
1275 | */ | |
1276 | movq %rdi, %rax | |
1277 | movq %rsi, %rdi | |
1278 | call *%rax | |
1279 | # exit | |
1c5b5cfd | 1280 | mov %eax, %edi |
1da177e4 | 1281 | call do_exit |
c05991ed | 1282 | CFI_ENDPROC |
4b787e0b | 1283 | ENDPROC(child_rip) |
1da177e4 LT |
1284 | |
1285 | /* | |
1286 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
1287 | * | |
1288 | * C extern interface: | |
1289 | * extern long execve(char *name, char **argv, char **envp) | |
1290 | * | |
1291 | * asm input arguments: | |
1292 | * rdi: name, rsi: argv, rdx: envp | |
1293 | * | |
1294 | * We want to fallback into: | |
5d119b2c | 1295 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs *regs) |
1da177e4 LT |
1296 | * |
1297 | * do_sys_execve asm fallback arguments: | |
5d119b2c | 1298 | * rdi: name, rsi: argv, rdx: envp, rcx: fake frame on the stack |
1da177e4 | 1299 | */ |
3db03b4a | 1300 | ENTRY(kernel_execve) |
1da177e4 LT |
1301 | CFI_STARTPROC |
1302 | FAKE_STACK_FRAME $0 | |
0bd7b798 | 1303 | SAVE_ALL |
5d119b2c | 1304 | movq %rsp,%rcx |
1da177e4 | 1305 | call sys_execve |
0bd7b798 | 1306 | movq %rax, RAX(%rsp) |
1da177e4 LT |
1307 | RESTORE_REST |
1308 | testq %rax,%rax | |
1309 | je int_ret_from_sys_call | |
1310 | RESTORE_ARGS | |
1311 | UNFAKE_STACK_FRAME | |
1312 | ret | |
1313 | CFI_ENDPROC | |
3db03b4a | 1314 | ENDPROC(kernel_execve) |
1da177e4 | 1315 | |
0f2fbdcb | 1316 | KPROBE_ENTRY(page_fault) |
1da177e4 | 1317 | errorentry do_page_fault |
d28c4393 | 1318 | KPROBE_END(page_fault) |
1da177e4 LT |
1319 | |
1320 | ENTRY(coprocessor_error) | |
1321 | zeroentry do_coprocessor_error | |
4b787e0b | 1322 | END(coprocessor_error) |
1da177e4 LT |
1323 | |
1324 | ENTRY(simd_coprocessor_error) | |
0bd7b798 | 1325 | zeroentry do_simd_coprocessor_error |
4b787e0b | 1326 | END(simd_coprocessor_error) |
1da177e4 LT |
1327 | |
1328 | ENTRY(device_not_available) | |
e407d620 | 1329 | zeroentry do_device_not_available |
4b787e0b | 1330 | END(device_not_available) |
1da177e4 LT |
1331 | |
1332 | /* runs on exception stack */ | |
0f2fbdcb | 1333 | KPROBE_ENTRY(debug) |
7effaa88 | 1334 | INTR_FRAME |
09402947 | 1335 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1336 | pushq $0 |
0bd7b798 | 1337 | CFI_ADJUST_CFA_OFFSET 8 |
5f8efbb9 | 1338 | paranoidentry do_debug, DEBUG_STACK |
e2f6bc25 AH |
1339 | jmp paranoid_exit |
1340 | CFI_ENDPROC | |
d28c4393 | 1341 | KPROBE_END(debug) |
1da177e4 | 1342 | |
0bd7b798 | 1343 | /* runs on exception stack */ |
eddb6fb9 | 1344 | KPROBE_ENTRY(nmi) |
7effaa88 | 1345 | INTR_FRAME |
09402947 | 1346 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
e2f6bc25 AH |
1347 | pushq_cfi $-1 |
1348 | subq $15*8, %rsp | |
1349 | CFI_ADJUST_CFA_OFFSET 15*8 | |
1350 | call save_paranoid | |
1351 | DEFAULT_FRAME 0 | |
1352 | /* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */ | |
1353 | movq %rsp,%rdi | |
1354 | movq ORIG_RAX(%rsp),%rsi | |
1355 | movq $-1,ORIG_RAX(%rsp) | |
1356 | call do_nmi | |
1357 | DISABLE_INTERRUPTS(CLBR_NONE) | |
2601e64d | 1358 | #ifdef CONFIG_TRACE_IRQFLAGS |
e2f6bc25 AH |
1359 | /* paranoidexit; without TRACE_IRQS_OFF */ |
1360 | /* ebx: no swapgs flag */ | |
1361 | nmi_exit: | |
1362 | testl %ebx,%ebx /* swapgs needed? */ | |
1363 | jnz nmi_restore | |
1364 | testl $3,CS(%rsp) | |
1365 | jnz nmi_userspace | |
1366 | nmi_swapgs: | |
1367 | SWAPGS_UNSAFE_STACK | |
1368 | nmi_restore: | |
1369 | RESTORE_ALL 8 | |
1370 | jmp irq_return | |
1371 | nmi_userspace: | |
1372 | GET_THREAD_INFO(%rcx) | |
1373 | movl TI_flags(%rcx),%ebx | |
1374 | andl $_TIF_WORK_MASK,%ebx | |
1375 | jz nmi_swapgs | |
1376 | movq %rsp,%rdi /* &pt_regs */ | |
1377 | call sync_regs | |
1378 | movq %rax,%rsp /* switch stack for scheduling */ | |
1379 | testl $_TIF_NEED_RESCHED,%ebx | |
1380 | jnz nmi_schedule | |
1381 | movl %ebx,%edx /* arg3: thread flags */ | |
1382 | ENABLE_INTERRUPTS(CLBR_NONE) | |
1383 | xorl %esi,%esi /* arg2: oldset */ | |
1384 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1385 | call do_notify_resume | |
1386 | DISABLE_INTERRUPTS(CLBR_NONE) | |
1387 | jmp nmi_userspace | |
1388 | nmi_schedule: | |
1389 | ENABLE_INTERRUPTS(CLBR_ANY) | |
1390 | call schedule | |
1391 | DISABLE_INTERRUPTS(CLBR_ANY) | |
1392 | jmp nmi_userspace | |
1393 | CFI_ENDPROC | |
2601e64d | 1394 | #else |
e2f6bc25 | 1395 | jmp paranoid_exit |
2601e64d IM |
1396 | CFI_ENDPROC |
1397 | #endif | |
d28c4393 | 1398 | KPROBE_END(nmi) |
6fefb0d1 | 1399 | |
0f2fbdcb | 1400 | KPROBE_ENTRY(int3) |
b556b35e | 1401 | INTR_FRAME |
09402947 | 1402 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
b556b35e JB |
1403 | pushq $0 |
1404 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1405 | paranoidentry do_int3, DEBUG_STACK |
e2f6bc25 | 1406 | jmp paranoid_exit |
b556b35e | 1407 | CFI_ENDPROC |
d28c4393 | 1408 | KPROBE_END(int3) |
1da177e4 LT |
1409 | |
1410 | ENTRY(overflow) | |
1411 | zeroentry do_overflow | |
4b787e0b | 1412 | END(overflow) |
1da177e4 LT |
1413 | |
1414 | ENTRY(bounds) | |
1415 | zeroentry do_bounds | |
4b787e0b | 1416 | END(bounds) |
1da177e4 LT |
1417 | |
1418 | ENTRY(invalid_op) | |
0bd7b798 | 1419 | zeroentry do_invalid_op |
4b787e0b | 1420 | END(invalid_op) |
1da177e4 LT |
1421 | |
1422 | ENTRY(coprocessor_segment_overrun) | |
1423 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 1424 | END(coprocessor_segment_overrun) |
1da177e4 | 1425 | |
1da177e4 LT |
1426 | /* runs on exception stack */ |
1427 | ENTRY(double_fault) | |
7effaa88 | 1428 | XCPT_FRAME |
09402947 | 1429 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1430 | paranoidentry do_double_fault |
e2f6bc25 | 1431 | jmp paranoid_exit |
1da177e4 | 1432 | CFI_ENDPROC |
4b787e0b | 1433 | END(double_fault) |
1da177e4 LT |
1434 | |
1435 | ENTRY(invalid_TSS) | |
1436 | errorentry do_invalid_TSS | |
4b787e0b | 1437 | END(invalid_TSS) |
1da177e4 LT |
1438 | |
1439 | ENTRY(segment_not_present) | |
1440 | errorentry do_segment_not_present | |
4b787e0b | 1441 | END(segment_not_present) |
1da177e4 LT |
1442 | |
1443 | /* runs on exception stack */ | |
1444 | ENTRY(stack_segment) | |
7effaa88 | 1445 | XCPT_FRAME |
09402947 | 1446 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1447 | paranoidentry do_stack_segment |
e2f6bc25 | 1448 | jmp paranoid_exit |
1da177e4 | 1449 | CFI_ENDPROC |
4b787e0b | 1450 | END(stack_segment) |
1da177e4 | 1451 | |
0f2fbdcb | 1452 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1453 | errorentry do_general_protection |
d28c4393 | 1454 | KPROBE_END(general_protection) |
1da177e4 LT |
1455 | |
1456 | ENTRY(alignment_check) | |
1457 | errorentry do_alignment_check | |
4b787e0b | 1458 | END(alignment_check) |
1da177e4 LT |
1459 | |
1460 | ENTRY(divide_error) | |
1461 | zeroentry do_divide_error | |
4b787e0b | 1462 | END(divide_error) |
1da177e4 LT |
1463 | |
1464 | ENTRY(spurious_interrupt_bug) | |
1465 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1466 | END(spurious_interrupt_bug) |
1da177e4 LT |
1467 | |
1468 | #ifdef CONFIG_X86_MCE | |
1469 | /* runs on exception stack */ | |
1470 | ENTRY(machine_check) | |
7effaa88 | 1471 | INTR_FRAME |
09402947 | 1472 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1473 | pushq $0 |
0bd7b798 | 1474 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 1475 | paranoidentry do_machine_check |
e2f6bc25 | 1476 | jmp paranoid_exit |
1da177e4 | 1477 | CFI_ENDPROC |
4b787e0b | 1478 | END(machine_check) |
1da177e4 LT |
1479 | #endif |
1480 | ||
2699500b | 1481 | /* Call softirq on interrupt stack. Interrupts are off. */ |
ed6b676c | 1482 | ENTRY(call_softirq) |
7effaa88 | 1483 | CFI_STARTPROC |
2699500b AK |
1484 | push %rbp |
1485 | CFI_ADJUST_CFA_OFFSET 8 | |
1486 | CFI_REL_OFFSET rbp,0 | |
1487 | mov %rsp,%rbp | |
1488 | CFI_DEF_CFA_REGISTER rbp | |
ed6b676c | 1489 | incl %gs:pda_irqcount |
2699500b AK |
1490 | cmove %gs:pda_irqstackptr,%rsp |
1491 | push %rbp # backlink for old unwinder | |
ed6b676c | 1492 | call __do_softirq |
2699500b | 1493 | leaveq |
7effaa88 | 1494 | CFI_DEF_CFA_REGISTER rsp |
2699500b | 1495 | CFI_ADJUST_CFA_OFFSET -8 |
ed6b676c | 1496 | decl %gs:pda_irqcount |
ed6b676c | 1497 | ret |
7effaa88 | 1498 | CFI_ENDPROC |
4b787e0b | 1499 | ENDPROC(call_softirq) |
75154f40 AK |
1500 | |
1501 | KPROBE_ENTRY(ignore_sysret) | |
1502 | CFI_STARTPROC | |
1503 | mov $-ENOSYS,%eax | |
1504 | sysret | |
1505 | CFI_ENDPROC | |
1506 | ENDPROC(ignore_sysret) | |
3d75e1b8 JF |
1507 | |
1508 | #ifdef CONFIG_XEN | |
1509 | ENTRY(xen_hypervisor_callback) | |
1510 | zeroentry xen_do_hypervisor_callback | |
1511 | END(xen_hypervisor_callback) | |
1512 | ||
1513 | /* | |
1514 | # A note on the "critical region" in our callback handler. | |
1515 | # We want to avoid stacking callback handlers due to events occurring | |
1516 | # during handling of the last event. To do this, we keep events disabled | |
1517 | # until we've done all processing. HOWEVER, we must enable events before | |
1518 | # popping the stack frame (can't be done atomically) and so it would still | |
1519 | # be possible to get enough handler activations to overflow the stack. | |
1520 | # Although unlikely, bugs of that kind are hard to track down, so we'd | |
1521 | # like to avoid the possibility. | |
1522 | # So, on entry to the handler we detect whether we interrupted an | |
1523 | # existing activation in its critical region -- if so, we pop the current | |
1524 | # activation and restart the handler using the previous one. | |
1525 | */ | |
1526 | ENTRY(xen_do_hypervisor_callback) # do_hypervisor_callback(struct *pt_regs) | |
1527 | CFI_STARTPROC | |
1528 | /* Since we don't modify %rdi, evtchn_do_upall(struct *pt_regs) will | |
1529 | see the correct pointer to the pt_regs */ | |
1530 | movq %rdi, %rsp # we don't return, adjust the stack frame | |
1531 | CFI_ENDPROC | |
dcd072e2 | 1532 | DEFAULT_FRAME |
3d75e1b8 JF |
1533 | 11: incl %gs:pda_irqcount |
1534 | movq %rsp,%rbp | |
1535 | CFI_DEF_CFA_REGISTER rbp | |
1536 | cmovzq %gs:pda_irqstackptr,%rsp | |
1537 | pushq %rbp # backlink for old unwinder | |
1538 | call xen_evtchn_do_upcall | |
1539 | popq %rsp | |
1540 | CFI_DEF_CFA_REGISTER rsp | |
1541 | decl %gs:pda_irqcount | |
1542 | jmp error_exit | |
1543 | CFI_ENDPROC | |
1544 | END(do_hypervisor_callback) | |
1545 | ||
1546 | /* | |
1547 | # Hypervisor uses this for application faults while it executes. | |
1548 | # We get here for two reasons: | |
1549 | # 1. Fault while reloading DS, ES, FS or GS | |
1550 | # 2. Fault while executing IRET | |
1551 | # Category 1 we do not need to fix up as Xen has already reloaded all segment | |
1552 | # registers that could be reloaded and zeroed the others. | |
1553 | # Category 2 we fix up by killing the current process. We cannot use the | |
1554 | # normal Linux return path in this case because if we use the IRET hypercall | |
1555 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1556 | # We distinguish between categories by comparing each saved segment register | |
1557 | # with its current contents: any discrepancy means we in category 1. | |
1558 | */ | |
1559 | ENTRY(xen_failsafe_callback) | |
dcd072e2 AH |
1560 | INTR_FRAME 1 (6*8) |
1561 | /*CFI_REL_OFFSET gs,GS*/ | |
1562 | /*CFI_REL_OFFSET fs,FS*/ | |
1563 | /*CFI_REL_OFFSET es,ES*/ | |
1564 | /*CFI_REL_OFFSET ds,DS*/ | |
1565 | CFI_REL_OFFSET r11,8 | |
1566 | CFI_REL_OFFSET rcx,0 | |
3d75e1b8 JF |
1567 | movw %ds,%cx |
1568 | cmpw %cx,0x10(%rsp) | |
1569 | CFI_REMEMBER_STATE | |
1570 | jne 1f | |
1571 | movw %es,%cx | |
1572 | cmpw %cx,0x18(%rsp) | |
1573 | jne 1f | |
1574 | movw %fs,%cx | |
1575 | cmpw %cx,0x20(%rsp) | |
1576 | jne 1f | |
1577 | movw %gs,%cx | |
1578 | cmpw %cx,0x28(%rsp) | |
1579 | jne 1f | |
1580 | /* All segments match their saved values => Category 2 (Bad IRET). */ | |
1581 | movq (%rsp),%rcx | |
1582 | CFI_RESTORE rcx | |
1583 | movq 8(%rsp),%r11 | |
1584 | CFI_RESTORE r11 | |
1585 | addq $0x30,%rsp | |
1586 | CFI_ADJUST_CFA_OFFSET -0x30 | |
14ae22ba IM |
1587 | pushq_cfi $0 /* RIP */ |
1588 | pushq_cfi %r11 | |
1589 | pushq_cfi %rcx | |
4a5c3e77 | 1590 | jmp general_protection |
3d75e1b8 JF |
1591 | CFI_RESTORE_STATE |
1592 | 1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */ | |
1593 | movq (%rsp),%rcx | |
1594 | CFI_RESTORE rcx | |
1595 | movq 8(%rsp),%r11 | |
1596 | CFI_RESTORE r11 | |
1597 | addq $0x30,%rsp | |
1598 | CFI_ADJUST_CFA_OFFSET -0x30 | |
14ae22ba | 1599 | pushq_cfi $0 |
3d75e1b8 JF |
1600 | SAVE_ALL |
1601 | jmp error_exit | |
1602 | CFI_ENDPROC | |
3d75e1b8 JF |
1603 | END(xen_failsafe_callback) |
1604 | ||
1605 | #endif /* CONFIG_XEN */ |