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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 | */ | |
66 | .macro CFI_PUSHQ reg | |
67 | pushq \reg | |
68 | CFI_ADJUST_CFA_OFFSET 8 | |
69 | .endm | |
70 | ||
71 | .macro CFI_POPQ reg | |
72 | popq \reg | |
73 | CFI_ADJUST_CFA_OFFSET -8 | |
74 | .endm | |
75 | ||
76 | .macro CFI_MOVQ reg offset=0 | |
77 | movq %\reg, \offset(%rsp) | |
78 | CFI_REL_OFFSET \reg, \offset | |
79 | .endm | |
1da177e4 | 80 | |
606576ce | 81 | #ifdef CONFIG_FUNCTION_TRACER |
d61f82d0 SR |
82 | #ifdef CONFIG_DYNAMIC_FTRACE |
83 | ENTRY(mcount) | |
d61f82d0 SR |
84 | retq |
85 | END(mcount) | |
86 | ||
87 | ENTRY(ftrace_caller) | |
88 | ||
89 | /* taken from glibc */ | |
90 | subq $0x38, %rsp | |
91 | movq %rax, (%rsp) | |
92 | movq %rcx, 8(%rsp) | |
93 | movq %rdx, 16(%rsp) | |
94 | movq %rsi, 24(%rsp) | |
95 | movq %rdi, 32(%rsp) | |
96 | movq %r8, 40(%rsp) | |
97 | movq %r9, 48(%rsp) | |
98 | ||
99 | movq 0x38(%rsp), %rdi | |
100 | movq 8(%rbp), %rsi | |
395a59d0 | 101 | subq $MCOUNT_INSN_SIZE, %rdi |
d61f82d0 SR |
102 | |
103 | .globl ftrace_call | |
104 | ftrace_call: | |
105 | call ftrace_stub | |
106 | ||
107 | movq 48(%rsp), %r9 | |
108 | movq 40(%rsp), %r8 | |
109 | movq 32(%rsp), %rdi | |
110 | movq 24(%rsp), %rsi | |
111 | movq 16(%rsp), %rdx | |
112 | movq 8(%rsp), %rcx | |
113 | movq (%rsp), %rax | |
114 | addq $0x38, %rsp | |
115 | ||
116 | .globl ftrace_stub | |
117 | ftrace_stub: | |
118 | retq | |
119 | END(ftrace_caller) | |
120 | ||
121 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
16444a8a ACM |
122 | ENTRY(mcount) |
123 | cmpq $ftrace_stub, ftrace_trace_function | |
124 | jnz trace | |
125 | .globl ftrace_stub | |
126 | ftrace_stub: | |
127 | retq | |
128 | ||
129 | trace: | |
130 | /* taken from glibc */ | |
131 | subq $0x38, %rsp | |
132 | movq %rax, (%rsp) | |
133 | movq %rcx, 8(%rsp) | |
134 | movq %rdx, 16(%rsp) | |
135 | movq %rsi, 24(%rsp) | |
136 | movq %rdi, 32(%rsp) | |
137 | movq %r8, 40(%rsp) | |
138 | movq %r9, 48(%rsp) | |
139 | ||
140 | movq 0x38(%rsp), %rdi | |
141 | movq 8(%rbp), %rsi | |
395a59d0 | 142 | subq $MCOUNT_INSN_SIZE, %rdi |
16444a8a ACM |
143 | |
144 | call *ftrace_trace_function | |
145 | ||
146 | movq 48(%rsp), %r9 | |
147 | movq 40(%rsp), %r8 | |
148 | movq 32(%rsp), %rdi | |
149 | movq 24(%rsp), %rsi | |
150 | movq 16(%rsp), %rdx | |
151 | movq 8(%rsp), %rcx | |
152 | movq (%rsp), %rax | |
153 | addq $0x38, %rsp | |
154 | ||
155 | jmp ftrace_stub | |
156 | END(mcount) | |
d61f82d0 | 157 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
606576ce | 158 | #endif /* CONFIG_FUNCTION_TRACER */ |
16444a8a | 159 | |
dc37db4d | 160 | #ifndef CONFIG_PREEMPT |
1da177e4 | 161 | #define retint_kernel retint_restore_args |
0bd7b798 | 162 | #endif |
2601e64d | 163 | |
72fe4858 | 164 | #ifdef CONFIG_PARAVIRT |
2be29982 | 165 | ENTRY(native_usergs_sysret64) |
72fe4858 GOC |
166 | swapgs |
167 | sysretq | |
168 | #endif /* CONFIG_PARAVIRT */ | |
169 | ||
2601e64d IM |
170 | |
171 | .macro TRACE_IRQS_IRETQ offset=ARGOFFSET | |
172 | #ifdef CONFIG_TRACE_IRQFLAGS | |
173 | bt $9,EFLAGS-\offset(%rsp) /* interrupts off? */ | |
174 | jnc 1f | |
175 | TRACE_IRQS_ON | |
176 | 1: | |
177 | #endif | |
178 | .endm | |
179 | ||
1da177e4 | 180 | /* |
0bd7b798 AH |
181 | * C code is not supposed to know about undefined top of stack. Every time |
182 | * a C function with an pt_regs argument is called from the SYSCALL based | |
1da177e4 LT |
183 | * fast path FIXUP_TOP_OF_STACK is needed. |
184 | * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs | |
185 | * manipulation. | |
0bd7b798 AH |
186 | */ |
187 | ||
188 | /* %rsp:at FRAMEEND */ | |
1da177e4 LT |
189 | .macro FIXUP_TOP_OF_STACK tmp |
190 | movq %gs:pda_oldrsp,\tmp | |
191 | movq \tmp,RSP(%rsp) | |
192 | movq $__USER_DS,SS(%rsp) | |
193 | movq $__USER_CS,CS(%rsp) | |
194 | movq $-1,RCX(%rsp) | |
195 | movq R11(%rsp),\tmp /* get eflags */ | |
196 | movq \tmp,EFLAGS(%rsp) | |
197 | .endm | |
198 | ||
199 | .macro RESTORE_TOP_OF_STACK tmp,offset=0 | |
200 | movq RSP-\offset(%rsp),\tmp | |
201 | movq \tmp,%gs:pda_oldrsp | |
202 | movq EFLAGS-\offset(%rsp),\tmp | |
203 | movq \tmp,R11-\offset(%rsp) | |
204 | .endm | |
205 | ||
206 | .macro FAKE_STACK_FRAME child_rip | |
207 | /* push in order ss, rsp, eflags, cs, rip */ | |
3829ee6b | 208 | xorl %eax, %eax |
e04e0a63 | 209 | pushq $__KERNEL_DS /* ss */ |
1da177e4 | 210 | CFI_ADJUST_CFA_OFFSET 8 |
7effaa88 | 211 | /*CFI_REL_OFFSET ss,0*/ |
1da177e4 LT |
212 | pushq %rax /* rsp */ |
213 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 214 | CFI_REL_OFFSET rsp,0 |
1da177e4 LT |
215 | pushq $(1<<9) /* eflags - interrupts on */ |
216 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 217 | /*CFI_REL_OFFSET rflags,0*/ |
1da177e4 LT |
218 | pushq $__KERNEL_CS /* cs */ |
219 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 220 | /*CFI_REL_OFFSET cs,0*/ |
1da177e4 LT |
221 | pushq \child_rip /* rip */ |
222 | CFI_ADJUST_CFA_OFFSET 8 | |
7effaa88 | 223 | CFI_REL_OFFSET rip,0 |
1da177e4 LT |
224 | pushq %rax /* orig rax */ |
225 | CFI_ADJUST_CFA_OFFSET 8 | |
226 | .endm | |
227 | ||
228 | .macro UNFAKE_STACK_FRAME | |
229 | addq $8*6, %rsp | |
230 | CFI_ADJUST_CFA_OFFSET -(6*8) | |
231 | .endm | |
232 | ||
dcd072e2 AH |
233 | /* |
234 | * initial frame state for interrupts (and exceptions without error code) | |
235 | */ | |
236 | .macro EMPTY_FRAME start=1 offset=0 | |
7effaa88 | 237 | .if \start |
dcd072e2 | 238 | CFI_STARTPROC simple |
adf14236 | 239 | CFI_SIGNAL_FRAME |
dcd072e2 | 240 | CFI_DEF_CFA rsp,8+\offset |
7effaa88 | 241 | .else |
dcd072e2 | 242 | CFI_DEF_CFA_OFFSET 8+\offset |
7effaa88 | 243 | .endif |
1da177e4 | 244 | .endm |
d99015b1 AH |
245 | |
246 | /* | |
dcd072e2 | 247 | * initial frame state for interrupts (and exceptions without error code) |
d99015b1 | 248 | */ |
dcd072e2 | 249 | .macro INTR_FRAME start=1 offset=0 |
e8a0e276 IM |
250 | EMPTY_FRAME \start, SS+8+\offset-RIP |
251 | /*CFI_REL_OFFSET ss, SS+\offset-RIP*/ | |
252 | CFI_REL_OFFSET rsp, RSP+\offset-RIP | |
253 | /*CFI_REL_OFFSET rflags, EFLAGS+\offset-RIP*/ | |
254 | /*CFI_REL_OFFSET cs, CS+\offset-RIP*/ | |
255 | CFI_REL_OFFSET rip, RIP+\offset-RIP | |
d99015b1 AH |
256 | .endm |
257 | ||
d99015b1 AH |
258 | /* |
259 | * initial frame state for exceptions with error code (and interrupts | |
260 | * with vector already pushed) | |
261 | */ | |
dcd072e2 | 262 | .macro XCPT_FRAME start=1 offset=0 |
e8a0e276 | 263 | INTR_FRAME \start, RIP+\offset-ORIG_RAX |
dcd072e2 AH |
264 | /*CFI_REL_OFFSET orig_rax, ORIG_RAX-ORIG_RAX*/ |
265 | .endm | |
266 | ||
267 | /* | |
268 | * frame that enables calling into C. | |
269 | */ | |
270 | .macro PARTIAL_FRAME start=1 offset=0 | |
e8a0e276 IM |
271 | XCPT_FRAME \start, ORIG_RAX+\offset-ARGOFFSET |
272 | CFI_REL_OFFSET rdi, RDI+\offset-ARGOFFSET | |
273 | CFI_REL_OFFSET rsi, RSI+\offset-ARGOFFSET | |
274 | CFI_REL_OFFSET rdx, RDX+\offset-ARGOFFSET | |
275 | CFI_REL_OFFSET rcx, RCX+\offset-ARGOFFSET | |
276 | CFI_REL_OFFSET rax, RAX+\offset-ARGOFFSET | |
277 | CFI_REL_OFFSET r8, R8+\offset-ARGOFFSET | |
278 | CFI_REL_OFFSET r9, R9+\offset-ARGOFFSET | |
279 | CFI_REL_OFFSET r10, R10+\offset-ARGOFFSET | |
280 | CFI_REL_OFFSET r11, R11+\offset-ARGOFFSET | |
dcd072e2 AH |
281 | .endm |
282 | ||
283 | /* | |
284 | * frame that enables passing a complete pt_regs to a C function. | |
285 | */ | |
286 | .macro DEFAULT_FRAME start=1 offset=0 | |
e8a0e276 | 287 | PARTIAL_FRAME \start, R11+\offset-R15 |
dcd072e2 AH |
288 | CFI_REL_OFFSET rbx, RBX+\offset |
289 | CFI_REL_OFFSET rbp, RBP+\offset | |
290 | CFI_REL_OFFSET r12, R12+\offset | |
291 | CFI_REL_OFFSET r13, R13+\offset | |
292 | CFI_REL_OFFSET r14, R14+\offset | |
293 | CFI_REL_OFFSET r15, R15+\offset | |
294 | .endm | |
d99015b1 AH |
295 | |
296 | /* save partial stack frame */ | |
297 | ENTRY(save_args) | |
298 | XCPT_FRAME | |
299 | cld | |
e8a0e276 IM |
300 | CFI_MOVQ rdi, RDI+16-ARGOFFSET |
301 | CFI_MOVQ rsi, RSI+16-ARGOFFSET | |
302 | CFI_MOVQ rdx, RDX+16-ARGOFFSET | |
303 | CFI_MOVQ rcx, RCX+16-ARGOFFSET | |
304 | CFI_MOVQ rax, RAX+16-ARGOFFSET | |
305 | CFI_MOVQ r8, R8+16-ARGOFFSET | |
306 | CFI_MOVQ r9, R9+16-ARGOFFSET | |
307 | CFI_MOVQ r10, R10+16-ARGOFFSET | |
308 | CFI_MOVQ r11, R11+16-ARGOFFSET | |
d99015b1 | 309 | leaq -ARGOFFSET+16(%rsp),%rdi /* arg1 for handler */ |
dcd072e2 | 310 | CFI_MOVQ rbp, 8 /* push %rbp */ |
d99015b1 AH |
311 | leaq 8(%rsp), %rbp /* mov %rsp, %ebp */ |
312 | testl $3, CS(%rdi) | |
313 | je 1f | |
314 | SWAPGS | |
315 | /* | |
316 | * irqcount is used to check if a CPU is already on an interrupt stack | |
317 | * or not. While this is essentially redundant with preempt_count it is | |
318 | * a little cheaper to use a separate counter in the PDA (short of | |
319 | * moving irq_enter into assembly, which would be too much work) | |
320 | */ | |
321 | 1: incl %gs:pda_irqcount | |
322 | jne 2f | |
dcd072e2 | 323 | CFI_POPQ %rax /* move return address... */ |
d99015b1 | 324 | mov %gs:pda_irqstackptr,%rsp |
dcd072e2 AH |
325 | EMPTY_FRAME 0 |
326 | CFI_PUSHQ %rax /* ... to the new stack */ | |
d99015b1 AH |
327 | /* |
328 | * We entered an interrupt context - irqs are off: | |
329 | */ | |
330 | 2: TRACE_IRQS_OFF | |
331 | ret | |
332 | CFI_ENDPROC | |
333 | END(save_args) | |
334 | ||
1da177e4 LT |
335 | /* |
336 | * A newly forked process directly context switches into this. | |
0bd7b798 AH |
337 | */ |
338 | /* rdi: prev */ | |
1da177e4 | 339 | ENTRY(ret_from_fork) |
dcd072e2 | 340 | DEFAULT_FRAME |
658fdbef | 341 | push kernel_eflags(%rip) |
e0a5a5d9 | 342 | CFI_ADJUST_CFA_OFFSET 8 |
658fdbef | 343 | popf # reset kernel eflags |
e0a5a5d9 | 344 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
345 | call schedule_tail |
346 | GET_THREAD_INFO(%rcx) | |
26ccb8a7 | 347 | testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx) |
1da177e4 | 348 | jnz rff_trace |
0bd7b798 | 349 | rff_action: |
1da177e4 LT |
350 | RESTORE_REST |
351 | testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? | |
352 | je int_ret_from_sys_call | |
26ccb8a7 | 353 | testl $_TIF_IA32,TI_flags(%rcx) |
1da177e4 LT |
354 | jnz int_ret_from_sys_call |
355 | RESTORE_TOP_OF_STACK %rdi,ARGOFFSET | |
356 | jmp ret_from_sys_call | |
357 | rff_trace: | |
358 | movq %rsp,%rdi | |
359 | call syscall_trace_leave | |
0bd7b798 | 360 | GET_THREAD_INFO(%rcx) |
1da177e4 LT |
361 | jmp rff_action |
362 | CFI_ENDPROC | |
4b787e0b | 363 | END(ret_from_fork) |
1da177e4 LT |
364 | |
365 | /* | |
366 | * System call entry. Upto 6 arguments in registers are supported. | |
367 | * | |
368 | * SYSCALL does not save anything on the stack and does not change the | |
369 | * stack pointer. | |
370 | */ | |
0bd7b798 | 371 | |
1da177e4 | 372 | /* |
0bd7b798 | 373 | * Register setup: |
1da177e4 LT |
374 | * rax system call number |
375 | * rdi arg0 | |
0bd7b798 | 376 | * rcx return address for syscall/sysret, C arg3 |
1da177e4 | 377 | * rsi arg1 |
0bd7b798 | 378 | * rdx arg2 |
1da177e4 LT |
379 | * r10 arg3 (--> moved to rcx for C) |
380 | * r8 arg4 | |
381 | * r9 arg5 | |
382 | * r11 eflags for syscall/sysret, temporary for C | |
0bd7b798 AH |
383 | * r12-r15,rbp,rbx saved by C code, not touched. |
384 | * | |
1da177e4 LT |
385 | * Interrupts are off on entry. |
386 | * Only called from user space. | |
387 | * | |
388 | * XXX if we had a free scratch register we could save the RSP into the stack frame | |
389 | * and report it properly in ps. Unfortunately we haven't. | |
7bf36bbc AK |
390 | * |
391 | * When user can change the frames always force IRET. That is because | |
392 | * it deals with uncanonical addresses better. SYSRET has trouble | |
393 | * with them due to bugs in both AMD and Intel CPUs. | |
0bd7b798 | 394 | */ |
1da177e4 LT |
395 | |
396 | ENTRY(system_call) | |
7effaa88 | 397 | CFI_STARTPROC simple |
adf14236 | 398 | CFI_SIGNAL_FRAME |
dffead4e | 399 | CFI_DEF_CFA rsp,PDA_STACKOFFSET |
7effaa88 JB |
400 | CFI_REGISTER rip,rcx |
401 | /*CFI_REGISTER rflags,r11*/ | |
72fe4858 GOC |
402 | SWAPGS_UNSAFE_STACK |
403 | /* | |
404 | * A hypervisor implementation might want to use a label | |
405 | * after the swapgs, so that it can do the swapgs | |
406 | * for the guest and jump here on syscall. | |
407 | */ | |
408 | ENTRY(system_call_after_swapgs) | |
409 | ||
0bd7b798 | 410 | movq %rsp,%gs:pda_oldrsp |
1da177e4 | 411 | movq %gs:pda_kernelstack,%rsp |
2601e64d IM |
412 | /* |
413 | * No need to follow this irqs off/on section - it's straight | |
414 | * and short: | |
415 | */ | |
72fe4858 | 416 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 417 | SAVE_ARGS 8,1 |
0bd7b798 | 418 | movq %rax,ORIG_RAX-ARGOFFSET(%rsp) |
7effaa88 JB |
419 | movq %rcx,RIP-ARGOFFSET(%rsp) |
420 | CFI_REL_OFFSET rip,RIP-ARGOFFSET | |
1da177e4 | 421 | GET_THREAD_INFO(%rcx) |
d4d67150 | 422 | testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%rcx) |
1da177e4 | 423 | jnz tracesys |
86a1c34a | 424 | system_call_fastpath: |
1da177e4 LT |
425 | cmpq $__NR_syscall_max,%rax |
426 | ja badsys | |
427 | movq %r10,%rcx | |
428 | call *sys_call_table(,%rax,8) # XXX: rip relative | |
429 | movq %rax,RAX-ARGOFFSET(%rsp) | |
430 | /* | |
431 | * Syscall return path ending with SYSRET (fast path) | |
0bd7b798 AH |
432 | * Has incomplete stack frame and undefined top of stack. |
433 | */ | |
1da177e4 | 434 | ret_from_sys_call: |
11b854b2 | 435 | movl $_TIF_ALLWORK_MASK,%edi |
1da177e4 | 436 | /* edi: flagmask */ |
0bd7b798 | 437 | sysret_check: |
10cd706d | 438 | LOCKDEP_SYS_EXIT |
1da177e4 | 439 | GET_THREAD_INFO(%rcx) |
72fe4858 | 440 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 441 | TRACE_IRQS_OFF |
26ccb8a7 | 442 | movl TI_flags(%rcx),%edx |
1da177e4 | 443 | andl %edi,%edx |
0bd7b798 | 444 | jnz sysret_careful |
bcddc015 | 445 | CFI_REMEMBER_STATE |
2601e64d IM |
446 | /* |
447 | * sysretq will re-enable interrupts: | |
448 | */ | |
449 | TRACE_IRQS_ON | |
1da177e4 | 450 | movq RIP-ARGOFFSET(%rsp),%rcx |
7effaa88 | 451 | CFI_REGISTER rip,rcx |
1da177e4 | 452 | RESTORE_ARGS 0,-ARG_SKIP,1 |
7effaa88 | 453 | /*CFI_REGISTER rflags,r11*/ |
c7245da6 | 454 | movq %gs:pda_oldrsp, %rsp |
2be29982 | 455 | USERGS_SYSRET64 |
1da177e4 | 456 | |
bcddc015 | 457 | CFI_RESTORE_STATE |
1da177e4 | 458 | /* Handle reschedules */ |
0bd7b798 | 459 | /* edx: work, edi: workmask */ |
1da177e4 LT |
460 | sysret_careful: |
461 | bt $TIF_NEED_RESCHED,%edx | |
462 | jnc sysret_signal | |
2601e64d | 463 | TRACE_IRQS_ON |
72fe4858 | 464 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 465 | pushq %rdi |
7effaa88 | 466 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
467 | call schedule |
468 | popq %rdi | |
7effaa88 | 469 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 LT |
470 | jmp sysret_check |
471 | ||
0bd7b798 | 472 | /* Handle a signal */ |
1da177e4 | 473 | sysret_signal: |
2601e64d | 474 | TRACE_IRQS_ON |
72fe4858 | 475 | ENABLE_INTERRUPTS(CLBR_NONE) |
86a1c34a RM |
476 | #ifdef CONFIG_AUDITSYSCALL |
477 | bt $TIF_SYSCALL_AUDIT,%edx | |
478 | jc sysret_audit | |
479 | #endif | |
10ffdbb8 | 480 | /* edx: work flags (arg3) */ |
1da177e4 LT |
481 | leaq do_notify_resume(%rip),%rax |
482 | leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1 | |
483 | xorl %esi,%esi # oldset -> arg2 | |
484 | call ptregscall_common | |
15e8f348 | 485 | movl $_TIF_WORK_MASK,%edi |
7bf36bbc AK |
486 | /* Use IRET because user could have changed frame. This |
487 | works because ptregscall_common has called FIXUP_TOP_OF_STACK. */ | |
72fe4858 | 488 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 489 | TRACE_IRQS_OFF |
7bf36bbc | 490 | jmp int_with_check |
0bd7b798 | 491 | |
7effaa88 JB |
492 | badsys: |
493 | movq $-ENOSYS,RAX-ARGOFFSET(%rsp) | |
494 | jmp ret_from_sys_call | |
495 | ||
86a1c34a RM |
496 | #ifdef CONFIG_AUDITSYSCALL |
497 | /* | |
498 | * Fast path for syscall audit without full syscall trace. | |
499 | * We just call audit_syscall_entry() directly, and then | |
500 | * jump back to the normal fast path. | |
501 | */ | |
502 | auditsys: | |
503 | movq %r10,%r9 /* 6th arg: 4th syscall arg */ | |
504 | movq %rdx,%r8 /* 5th arg: 3rd syscall arg */ | |
505 | movq %rsi,%rcx /* 4th arg: 2nd syscall arg */ | |
506 | movq %rdi,%rdx /* 3rd arg: 1st syscall arg */ | |
507 | movq %rax,%rsi /* 2nd arg: syscall number */ | |
508 | movl $AUDIT_ARCH_X86_64,%edi /* 1st arg: audit arch */ | |
509 | call audit_syscall_entry | |
510 | LOAD_ARGS 0 /* reload call-clobbered registers */ | |
511 | jmp system_call_fastpath | |
512 | ||
513 | /* | |
514 | * Return fast path for syscall audit. Call audit_syscall_exit() | |
515 | * directly and then jump back to the fast path with TIF_SYSCALL_AUDIT | |
516 | * masked off. | |
517 | */ | |
518 | sysret_audit: | |
519 | movq %rax,%rsi /* second arg, syscall return value */ | |
520 | cmpq $0,%rax /* is it < 0? */ | |
521 | setl %al /* 1 if so, 0 if not */ | |
522 | movzbl %al,%edi /* zero-extend that into %edi */ | |
523 | inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */ | |
524 | call audit_syscall_exit | |
525 | movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi | |
526 | jmp sysret_check | |
527 | #endif /* CONFIG_AUDITSYSCALL */ | |
528 | ||
1da177e4 | 529 | /* Do syscall tracing */ |
0bd7b798 | 530 | tracesys: |
86a1c34a RM |
531 | #ifdef CONFIG_AUDITSYSCALL |
532 | testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx) | |
533 | jz auditsys | |
534 | #endif | |
1da177e4 | 535 | SAVE_REST |
a31f8dd7 | 536 | movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ |
1da177e4 LT |
537 | FIXUP_TOP_OF_STACK %rdi |
538 | movq %rsp,%rdi | |
539 | call syscall_trace_enter | |
d4d67150 RM |
540 | /* |
541 | * Reload arg registers from stack in case ptrace changed them. | |
542 | * We don't reload %rax because syscall_trace_enter() returned | |
543 | * the value it wants us to use in the table lookup. | |
544 | */ | |
545 | LOAD_ARGS ARGOFFSET, 1 | |
1da177e4 LT |
546 | RESTORE_REST |
547 | cmpq $__NR_syscall_max,%rax | |
a31f8dd7 | 548 | ja int_ret_from_sys_call /* RAX(%rsp) set to -ENOSYS above */ |
1da177e4 LT |
549 | movq %r10,%rcx /* fixup for C */ |
550 | call *sys_call_table(,%rax,8) | |
a31f8dd7 | 551 | movq %rax,RAX-ARGOFFSET(%rsp) |
7bf36bbc | 552 | /* Use IRET because user could have changed frame */ |
0bd7b798 AH |
553 | |
554 | /* | |
1da177e4 LT |
555 | * Syscall return path ending with IRET. |
556 | * Has correct top of stack, but partial stack frame. | |
bcddc015 JB |
557 | */ |
558 | .globl int_ret_from_sys_call | |
5cbf1565 | 559 | .globl int_with_check |
bcddc015 | 560 | int_ret_from_sys_call: |
72fe4858 | 561 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 562 | TRACE_IRQS_OFF |
1da177e4 LT |
563 | testl $3,CS-ARGOFFSET(%rsp) |
564 | je retint_restore_args | |
565 | movl $_TIF_ALLWORK_MASK,%edi | |
566 | /* edi: mask to check */ | |
567 | int_with_check: | |
10cd706d | 568 | LOCKDEP_SYS_EXIT_IRQ |
1da177e4 | 569 | GET_THREAD_INFO(%rcx) |
26ccb8a7 | 570 | movl TI_flags(%rcx),%edx |
1da177e4 LT |
571 | andl %edi,%edx |
572 | jnz int_careful | |
26ccb8a7 | 573 | andl $~TS_COMPAT,TI_status(%rcx) |
1da177e4 LT |
574 | jmp retint_swapgs |
575 | ||
576 | /* Either reschedule or signal or syscall exit tracking needed. */ | |
577 | /* First do a reschedule test. */ | |
578 | /* edx: work, edi: workmask */ | |
579 | int_careful: | |
580 | bt $TIF_NEED_RESCHED,%edx | |
581 | jnc int_very_careful | |
2601e64d | 582 | TRACE_IRQS_ON |
72fe4858 | 583 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 584 | pushq %rdi |
7effaa88 | 585 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
586 | call schedule |
587 | popq %rdi | |
7effaa88 | 588 | CFI_ADJUST_CFA_OFFSET -8 |
72fe4858 | 589 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 590 | TRACE_IRQS_OFF |
1da177e4 LT |
591 | jmp int_with_check |
592 | ||
593 | /* handle signals and tracing -- both require a full stack frame */ | |
594 | int_very_careful: | |
2601e64d | 595 | TRACE_IRQS_ON |
72fe4858 | 596 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 597 | SAVE_REST |
0bd7b798 | 598 | /* Check for syscall exit trace */ |
d4d67150 | 599 | testl $_TIF_WORK_SYSCALL_EXIT,%edx |
1da177e4 LT |
600 | jz int_signal |
601 | pushq %rdi | |
7effaa88 | 602 | CFI_ADJUST_CFA_OFFSET 8 |
0bd7b798 | 603 | leaq 8(%rsp),%rdi # &ptregs -> arg1 |
1da177e4 LT |
604 | call syscall_trace_leave |
605 | popq %rdi | |
7effaa88 | 606 | CFI_ADJUST_CFA_OFFSET -8 |
d4d67150 | 607 | andl $~(_TIF_WORK_SYSCALL_EXIT|_TIF_SYSCALL_EMU),%edi |
1da177e4 | 608 | jmp int_restore_rest |
0bd7b798 | 609 | |
1da177e4 | 610 | int_signal: |
8f4d37ec | 611 | testl $_TIF_DO_NOTIFY_MASK,%edx |
1da177e4 LT |
612 | jz 1f |
613 | movq %rsp,%rdi # &ptregs -> arg1 | |
614 | xorl %esi,%esi # oldset -> arg2 | |
615 | call do_notify_resume | |
eca91e78 | 616 | 1: movl $_TIF_WORK_MASK,%edi |
1da177e4 LT |
617 | int_restore_rest: |
618 | RESTORE_REST | |
72fe4858 | 619 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 620 | TRACE_IRQS_OFF |
1da177e4 LT |
621 | jmp int_with_check |
622 | CFI_ENDPROC | |
bcddc015 | 623 | END(system_call) |
0bd7b798 AH |
624 | |
625 | /* | |
1da177e4 | 626 | * Certain special system calls that need to save a complete full stack frame. |
0bd7b798 AH |
627 | */ |
628 | ||
1da177e4 LT |
629 | .macro PTREGSCALL label,func,arg |
630 | .globl \label | |
631 | \label: | |
632 | leaq \func(%rip),%rax | |
633 | leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */ | |
634 | jmp ptregscall_common | |
4b787e0b | 635 | END(\label) |
1da177e4 LT |
636 | .endm |
637 | ||
7effaa88 JB |
638 | CFI_STARTPROC |
639 | ||
1da177e4 LT |
640 | PTREGSCALL stub_clone, sys_clone, %r8 |
641 | PTREGSCALL stub_fork, sys_fork, %rdi | |
642 | PTREGSCALL stub_vfork, sys_vfork, %rdi | |
1da177e4 LT |
643 | PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx |
644 | PTREGSCALL stub_iopl, sys_iopl, %rsi | |
645 | ||
646 | ENTRY(ptregscall_common) | |
1da177e4 | 647 | popq %r11 |
7effaa88 JB |
648 | CFI_ADJUST_CFA_OFFSET -8 |
649 | CFI_REGISTER rip, r11 | |
1da177e4 LT |
650 | SAVE_REST |
651 | movq %r11, %r15 | |
7effaa88 | 652 | CFI_REGISTER rip, r15 |
1da177e4 LT |
653 | FIXUP_TOP_OF_STACK %r11 |
654 | call *%rax | |
655 | RESTORE_TOP_OF_STACK %r11 | |
656 | movq %r15, %r11 | |
7effaa88 | 657 | CFI_REGISTER rip, r11 |
1da177e4 LT |
658 | RESTORE_REST |
659 | pushq %r11 | |
7effaa88 JB |
660 | CFI_ADJUST_CFA_OFFSET 8 |
661 | CFI_REL_OFFSET rip, 0 | |
1da177e4 LT |
662 | ret |
663 | CFI_ENDPROC | |
4b787e0b | 664 | END(ptregscall_common) |
0bd7b798 | 665 | |
1da177e4 LT |
666 | ENTRY(stub_execve) |
667 | CFI_STARTPROC | |
668 | popq %r11 | |
7effaa88 JB |
669 | CFI_ADJUST_CFA_OFFSET -8 |
670 | CFI_REGISTER rip, r11 | |
1da177e4 | 671 | SAVE_REST |
1da177e4 | 672 | FIXUP_TOP_OF_STACK %r11 |
5d119b2c | 673 | movq %rsp, %rcx |
1da177e4 | 674 | call sys_execve |
1da177e4 | 675 | RESTORE_TOP_OF_STACK %r11 |
1da177e4 LT |
676 | movq %rax,RAX(%rsp) |
677 | RESTORE_REST | |
678 | jmp int_ret_from_sys_call | |
679 | CFI_ENDPROC | |
4b787e0b | 680 | END(stub_execve) |
0bd7b798 | 681 | |
1da177e4 LT |
682 | /* |
683 | * sigreturn is special because it needs to restore all registers on return. | |
684 | * This cannot be done with SYSRET, so use the IRET return path instead. | |
0bd7b798 | 685 | */ |
1da177e4 LT |
686 | ENTRY(stub_rt_sigreturn) |
687 | CFI_STARTPROC | |
7effaa88 JB |
688 | addq $8, %rsp |
689 | CFI_ADJUST_CFA_OFFSET -8 | |
1da177e4 LT |
690 | SAVE_REST |
691 | movq %rsp,%rdi | |
692 | FIXUP_TOP_OF_STACK %r11 | |
693 | call sys_rt_sigreturn | |
694 | movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer | |
695 | RESTORE_REST | |
696 | jmp int_ret_from_sys_call | |
697 | CFI_ENDPROC | |
4b787e0b | 698 | END(stub_rt_sigreturn) |
1da177e4 | 699 | |
939b7871 PA |
700 | /* |
701 | * Build the entry stubs and pointer table with some assembler magic. | |
702 | * We pack 7 stubs into a single 32-byte chunk, which will fit in a | |
703 | * single cache line on all modern x86 implementations. | |
704 | */ | |
705 | .section .init.rodata,"a" | |
706 | ENTRY(interrupt) | |
707 | .text | |
708 | .p2align 5 | |
709 | .p2align CONFIG_X86_L1_CACHE_SHIFT | |
710 | ENTRY(irq_entries_start) | |
711 | INTR_FRAME | |
712 | vector=FIRST_EXTERNAL_VECTOR | |
713 | .rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7 | |
714 | .balign 32 | |
715 | .rept 7 | |
716 | .if vector < NR_VECTORS | |
8665596e | 717 | .if vector <> FIRST_EXTERNAL_VECTOR |
939b7871 PA |
718 | CFI_ADJUST_CFA_OFFSET -8 |
719 | .endif | |
720 | 1: pushq $(~vector+0x80) /* Note: always in signed byte range */ | |
721 | CFI_ADJUST_CFA_OFFSET 8 | |
8665596e | 722 | .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6 |
939b7871 PA |
723 | jmp 2f |
724 | .endif | |
725 | .previous | |
726 | .quad 1b | |
727 | .text | |
728 | vector=vector+1 | |
729 | .endif | |
730 | .endr | |
731 | 2: jmp common_interrupt | |
732 | .endr | |
733 | CFI_ENDPROC | |
734 | END(irq_entries_start) | |
735 | ||
736 | .previous | |
737 | END(interrupt) | |
738 | .previous | |
739 | ||
d99015b1 | 740 | /* |
1da177e4 LT |
741 | * Interrupt entry/exit. |
742 | * | |
743 | * Interrupt entry points save only callee clobbered registers in fast path. | |
d99015b1 AH |
744 | * |
745 | * Entry runs with interrupts off. | |
746 | */ | |
1da177e4 | 747 | |
722024db | 748 | /* 0(%rsp): ~(interrupt number) */ |
1da177e4 | 749 | .macro interrupt func |
d99015b1 AH |
750 | subq $10*8, %rsp |
751 | CFI_ADJUST_CFA_OFFSET 10*8 | |
752 | call save_args | |
dcd072e2 | 753 | PARTIAL_FRAME 0 |
1da177e4 LT |
754 | call \func |
755 | .endm | |
756 | ||
722024db AH |
757 | /* |
758 | * The interrupt stubs push (~vector+0x80) onto the stack and | |
759 | * then jump to common_interrupt. | |
760 | */ | |
939b7871 PA |
761 | .p2align CONFIG_X86_L1_CACHE_SHIFT |
762 | common_interrupt: | |
7effaa88 | 763 | XCPT_FRAME |
722024db | 764 | addq $-0x80,(%rsp) /* Adjust vector to [-256,-1] range */ |
1da177e4 LT |
765 | interrupt do_IRQ |
766 | /* 0(%rsp): oldrsp-ARGOFFSET */ | |
7effaa88 | 767 | ret_from_intr: |
72fe4858 | 768 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 769 | TRACE_IRQS_OFF |
3829ee6b | 770 | decl %gs:pda_irqcount |
1de9c3f6 | 771 | leaveq |
7effaa88 | 772 | CFI_DEF_CFA_REGISTER rsp |
1de9c3f6 | 773 | CFI_ADJUST_CFA_OFFSET -8 |
7effaa88 | 774 | exit_intr: |
1da177e4 LT |
775 | GET_THREAD_INFO(%rcx) |
776 | testl $3,CS-ARGOFFSET(%rsp) | |
777 | je retint_kernel | |
0bd7b798 | 778 | |
1da177e4 LT |
779 | /* Interrupt came from user space */ |
780 | /* | |
781 | * Has a correct top of stack, but a partial stack frame | |
782 | * %rcx: thread info. Interrupts off. | |
0bd7b798 | 783 | */ |
1da177e4 LT |
784 | retint_with_reschedule: |
785 | movl $_TIF_WORK_MASK,%edi | |
7effaa88 | 786 | retint_check: |
10cd706d | 787 | LOCKDEP_SYS_EXIT_IRQ |
26ccb8a7 | 788 | movl TI_flags(%rcx),%edx |
1da177e4 | 789 | andl %edi,%edx |
7effaa88 | 790 | CFI_REMEMBER_STATE |
1da177e4 | 791 | jnz retint_careful |
10cd706d PZ |
792 | |
793 | retint_swapgs: /* return to user-space */ | |
2601e64d IM |
794 | /* |
795 | * The iretq could re-enable interrupts: | |
796 | */ | |
72fe4858 | 797 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d | 798 | TRACE_IRQS_IRETQ |
72fe4858 | 799 | SWAPGS |
2601e64d IM |
800 | jmp restore_args |
801 | ||
10cd706d | 802 | retint_restore_args: /* return to kernel space */ |
72fe4858 | 803 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d IM |
804 | /* |
805 | * The iretq could re-enable interrupts: | |
806 | */ | |
807 | TRACE_IRQS_IRETQ | |
808 | restore_args: | |
3701d863 IM |
809 | RESTORE_ARGS 0,8,0 |
810 | ||
f7f3d791 | 811 | irq_return: |
72fe4858 | 812 | INTERRUPT_RETURN |
3701d863 IM |
813 | |
814 | .section __ex_table, "a" | |
815 | .quad irq_return, bad_iret | |
816 | .previous | |
817 | ||
818 | #ifdef CONFIG_PARAVIRT | |
72fe4858 | 819 | ENTRY(native_iret) |
1da177e4 LT |
820 | iretq |
821 | ||
822 | .section __ex_table,"a" | |
72fe4858 | 823 | .quad native_iret, bad_iret |
1da177e4 | 824 | .previous |
3701d863 IM |
825 | #endif |
826 | ||
1da177e4 | 827 | .section .fixup,"ax" |
1da177e4 | 828 | bad_iret: |
3aa4b37d RM |
829 | /* |
830 | * The iret traps when the %cs or %ss being restored is bogus. | |
831 | * We've lost the original trap vector and error code. | |
832 | * #GPF is the most likely one to get for an invalid selector. | |
833 | * So pretend we completed the iret and took the #GPF in user mode. | |
834 | * | |
835 | * We are now running with the kernel GS after exception recovery. | |
836 | * But error_entry expects us to have user GS to match the user %cs, | |
837 | * so swap back. | |
838 | */ | |
839 | pushq $0 | |
840 | ||
841 | SWAPGS | |
842 | jmp general_protection | |
843 | ||
72fe4858 GOC |
844 | .previous |
845 | ||
7effaa88 | 846 | /* edi: workmask, edx: work */ |
1da177e4 | 847 | retint_careful: |
7effaa88 | 848 | CFI_RESTORE_STATE |
1da177e4 LT |
849 | bt $TIF_NEED_RESCHED,%edx |
850 | jnc retint_signal | |
2601e64d | 851 | TRACE_IRQS_ON |
72fe4858 | 852 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 853 | pushq %rdi |
7effaa88 | 854 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 855 | call schedule |
0bd7b798 | 856 | popq %rdi |
7effaa88 | 857 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 858 | GET_THREAD_INFO(%rcx) |
72fe4858 | 859 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 860 | TRACE_IRQS_OFF |
1da177e4 | 861 | jmp retint_check |
0bd7b798 | 862 | |
1da177e4 | 863 | retint_signal: |
8f4d37ec | 864 | testl $_TIF_DO_NOTIFY_MASK,%edx |
10ffdbb8 | 865 | jz retint_swapgs |
2601e64d | 866 | TRACE_IRQS_ON |
72fe4858 | 867 | ENABLE_INTERRUPTS(CLBR_NONE) |
1da177e4 | 868 | SAVE_REST |
0bd7b798 | 869 | movq $-1,ORIG_RAX(%rsp) |
3829ee6b | 870 | xorl %esi,%esi # oldset |
1da177e4 LT |
871 | movq %rsp,%rdi # &pt_regs |
872 | call do_notify_resume | |
873 | RESTORE_REST | |
72fe4858 | 874 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 875 | TRACE_IRQS_OFF |
be9e6870 | 876 | GET_THREAD_INFO(%rcx) |
eca91e78 | 877 | jmp retint_with_reschedule |
1da177e4 LT |
878 | |
879 | #ifdef CONFIG_PREEMPT | |
880 | /* Returning to kernel space. Check if we need preemption */ | |
881 | /* rcx: threadinfo. interrupts off. */ | |
b06babac | 882 | ENTRY(retint_kernel) |
26ccb8a7 | 883 | cmpl $0,TI_preempt_count(%rcx) |
1da177e4 | 884 | jnz retint_restore_args |
26ccb8a7 | 885 | bt $TIF_NEED_RESCHED,TI_flags(%rcx) |
1da177e4 LT |
886 | jnc retint_restore_args |
887 | bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ | |
888 | jnc retint_restore_args | |
889 | call preempt_schedule_irq | |
890 | jmp exit_intr | |
0bd7b798 | 891 | #endif |
4b787e0b | 892 | |
1da177e4 | 893 | CFI_ENDPROC |
4b787e0b | 894 | END(common_interrupt) |
0bd7b798 | 895 | |
1da177e4 LT |
896 | /* |
897 | * APIC interrupts. | |
0bd7b798 | 898 | */ |
d99015b1 AH |
899 | .p2align 5 |
900 | ||
1da177e4 | 901 | .macro apicinterrupt num,func |
7effaa88 | 902 | INTR_FRAME |
19eadf98 | 903 | pushq $~(\num) |
7effaa88 | 904 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 LT |
905 | interrupt \func |
906 | jmp ret_from_intr | |
907 | CFI_ENDPROC | |
908 | .endm | |
909 | ||
910 | ENTRY(thermal_interrupt) | |
911 | apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt | |
4b787e0b | 912 | END(thermal_interrupt) |
1da177e4 | 913 | |
89b831ef JS |
914 | ENTRY(threshold_interrupt) |
915 | apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt | |
4b787e0b | 916 | END(threshold_interrupt) |
89b831ef | 917 | |
0bd7b798 | 918 | #ifdef CONFIG_SMP |
1da177e4 LT |
919 | ENTRY(reschedule_interrupt) |
920 | apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt | |
4b787e0b | 921 | END(reschedule_interrupt) |
1da177e4 | 922 | |
e5bc8b6b AK |
923 | .macro INVALIDATE_ENTRY num |
924 | ENTRY(invalidate_interrupt\num) | |
0bd7b798 | 925 | apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt |
4b787e0b | 926 | END(invalidate_interrupt\num) |
e5bc8b6b AK |
927 | .endm |
928 | ||
929 | INVALIDATE_ENTRY 0 | |
930 | INVALIDATE_ENTRY 1 | |
931 | INVALIDATE_ENTRY 2 | |
932 | INVALIDATE_ENTRY 3 | |
933 | INVALIDATE_ENTRY 4 | |
934 | INVALIDATE_ENTRY 5 | |
935 | INVALIDATE_ENTRY 6 | |
936 | INVALIDATE_ENTRY 7 | |
1da177e4 LT |
937 | |
938 | ENTRY(call_function_interrupt) | |
939 | apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt | |
4b787e0b | 940 | END(call_function_interrupt) |
3b16cf87 JA |
941 | ENTRY(call_function_single_interrupt) |
942 | apicinterrupt CALL_FUNCTION_SINGLE_VECTOR,smp_call_function_single_interrupt | |
943 | END(call_function_single_interrupt) | |
61014292 EB |
944 | ENTRY(irq_move_cleanup_interrupt) |
945 | apicinterrupt IRQ_MOVE_CLEANUP_VECTOR,smp_irq_move_cleanup_interrupt | |
946 | END(irq_move_cleanup_interrupt) | |
1da177e4 LT |
947 | #endif |
948 | ||
1da177e4 LT |
949 | ENTRY(apic_timer_interrupt) |
950 | apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt | |
4b787e0b | 951 | END(apic_timer_interrupt) |
1da177e4 | 952 | |
1812924b CW |
953 | ENTRY(uv_bau_message_intr1) |
954 | apicinterrupt 220,uv_bau_message_interrupt | |
955 | END(uv_bau_message_intr1) | |
956 | ||
1da177e4 LT |
957 | ENTRY(error_interrupt) |
958 | apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt | |
4b787e0b | 959 | END(error_interrupt) |
1da177e4 LT |
960 | |
961 | ENTRY(spurious_interrupt) | |
962 | apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt | |
4b787e0b | 963 | END(spurious_interrupt) |
0bd7b798 | 964 | |
1da177e4 LT |
965 | /* |
966 | * Exception entry points. | |
0bd7b798 | 967 | */ |
1da177e4 | 968 | .macro zeroentry sym |
7effaa88 | 969 | INTR_FRAME |
fab58420 | 970 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
dcd072e2 | 971 | CFI_PUSHQ $-1 /* ORIG_RAX: no syscall to restart */ |
d99015b1 AH |
972 | subq $15*8,%rsp |
973 | CFI_ADJUST_CFA_OFFSET 15*8 | |
974 | call error_entry | |
dcd072e2 | 975 | DEFAULT_FRAME 0 |
d99015b1 AH |
976 | movq %rsp,%rdi /* pt_regs pointer */ |
977 | xorl %esi,%esi /* no error code */ | |
978 | call \sym | |
979 | jmp error_exit /* %ebx: no swapgs flag */ | |
7effaa88 | 980 | CFI_ENDPROC |
0bd7b798 | 981 | .endm |
1da177e4 LT |
982 | |
983 | .macro errorentry sym | |
7effaa88 | 984 | XCPT_FRAME |
fab58420 | 985 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
d99015b1 AH |
986 | subq $15*8,%rsp |
987 | CFI_ADJUST_CFA_OFFSET 15*8 | |
988 | call error_entry | |
dcd072e2 | 989 | DEFAULT_FRAME 0 |
d99015b1 AH |
990 | movq %rsp,%rdi /* pt_regs pointer */ |
991 | movq ORIG_RAX(%rsp),%rsi /* get error code */ | |
992 | movq $-1,ORIG_RAX(%rsp) /* no syscall to restart */ | |
993 | call \sym | |
994 | jmp error_exit /* %ebx: no swapgs flag */ | |
7effaa88 | 995 | CFI_ENDPROC |
1da177e4 LT |
996 | .endm |
997 | ||
998 | /* error code is on the stack already */ | |
999 | /* handle NMI like exceptions that can happen everywhere */ | |
2601e64d | 1000 | .macro paranoidentry sym, ist=0, irqtrace=1 |
1da177e4 LT |
1001 | SAVE_ALL |
1002 | cld | |
1003 | movl $1,%ebx | |
1004 | movl $MSR_GS_BASE,%ecx | |
1005 | rdmsr | |
1006 | testl %edx,%edx | |
1007 | js 1f | |
72fe4858 | 1008 | SWAPGS |
1da177e4 | 1009 | xorl %ebx,%ebx |
b556b35e JB |
1010 | 1: |
1011 | .if \ist | |
1012 | movq %gs:pda_data_offset, %rbp | |
1013 | .endif | |
7e61a793 AH |
1014 | .if \irqtrace |
1015 | TRACE_IRQS_OFF | |
1016 | .endif | |
b556b35e | 1017 | movq %rsp,%rdi |
1da177e4 LT |
1018 | movq ORIG_RAX(%rsp),%rsi |
1019 | movq $-1,ORIG_RAX(%rsp) | |
b556b35e | 1020 | .if \ist |
5f8efbb9 | 1021 | subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 1022 | .endif |
1da177e4 | 1023 | call \sym |
b556b35e | 1024 | .if \ist |
5f8efbb9 | 1025 | addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp) |
b556b35e | 1026 | .endif |
72fe4858 | 1027 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d IM |
1028 | .if \irqtrace |
1029 | TRACE_IRQS_OFF | |
1030 | .endif | |
1da177e4 | 1031 | .endm |
2601e64d IM |
1032 | |
1033 | /* | |
1034 | * "Paranoid" exit path from exception stack. | |
1035 | * Paranoid because this is used by NMIs and cannot take | |
1036 | * any kernel state for granted. | |
1037 | * We don't do kernel preemption checks here, because only | |
1038 | * NMI should be common and it does not enable IRQs and | |
1039 | * cannot get reschedule ticks. | |
1040 | * | |
1041 | * "trace" is 0 for the NMI handler only, because irq-tracing | |
1042 | * is fundamentally NMI-unsafe. (we cannot change the soft and | |
1043 | * hard flags at once, atomically) | |
1044 | */ | |
1045 | .macro paranoidexit trace=1 | |
1046 | /* ebx: no swapgs flag */ | |
1047 | paranoid_exit\trace: | |
1048 | testl %ebx,%ebx /* swapgs needed? */ | |
1049 | jnz paranoid_restore\trace | |
1050 | testl $3,CS(%rsp) | |
1051 | jnz paranoid_userspace\trace | |
1052 | paranoid_swapgs\trace: | |
7a0a2dff | 1053 | .if \trace |
2601e64d | 1054 | TRACE_IRQS_IRETQ 0 |
7a0a2dff | 1055 | .endif |
72fe4858 | 1056 | SWAPGS_UNSAFE_STACK |
2601e64d IM |
1057 | paranoid_restore\trace: |
1058 | RESTORE_ALL 8 | |
3701d863 | 1059 | jmp irq_return |
2601e64d IM |
1060 | paranoid_userspace\trace: |
1061 | GET_THREAD_INFO(%rcx) | |
26ccb8a7 | 1062 | movl TI_flags(%rcx),%ebx |
2601e64d IM |
1063 | andl $_TIF_WORK_MASK,%ebx |
1064 | jz paranoid_swapgs\trace | |
1065 | movq %rsp,%rdi /* &pt_regs */ | |
1066 | call sync_regs | |
1067 | movq %rax,%rsp /* switch stack for scheduling */ | |
1068 | testl $_TIF_NEED_RESCHED,%ebx | |
1069 | jnz paranoid_schedule\trace | |
1070 | movl %ebx,%edx /* arg3: thread flags */ | |
1071 | .if \trace | |
1072 | TRACE_IRQS_ON | |
1073 | .endif | |
72fe4858 | 1074 | ENABLE_INTERRUPTS(CLBR_NONE) |
2601e64d IM |
1075 | xorl %esi,%esi /* arg2: oldset */ |
1076 | movq %rsp,%rdi /* arg1: &pt_regs */ | |
1077 | call do_notify_resume | |
72fe4858 | 1078 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d IM |
1079 | .if \trace |
1080 | TRACE_IRQS_OFF | |
1081 | .endif | |
1082 | jmp paranoid_userspace\trace | |
1083 | paranoid_schedule\trace: | |
1084 | .if \trace | |
1085 | TRACE_IRQS_ON | |
1086 | .endif | |
72fe4858 | 1087 | ENABLE_INTERRUPTS(CLBR_ANY) |
2601e64d | 1088 | call schedule |
72fe4858 | 1089 | DISABLE_INTERRUPTS(CLBR_ANY) |
2601e64d IM |
1090 | .if \trace |
1091 | TRACE_IRQS_OFF | |
1092 | .endif | |
1093 | jmp paranoid_userspace\trace | |
1094 | CFI_ENDPROC | |
1095 | .endm | |
1096 | ||
1da177e4 | 1097 | /* |
d99015b1 AH |
1098 | * Exception entry point. This expects an error code/orig_rax on the stack. |
1099 | * returns in "no swapgs flag" in %ebx. | |
0bd7b798 | 1100 | */ |
d28c4393 | 1101 | KPROBE_ENTRY(error_entry) |
dcd072e2 | 1102 | XCPT_FRAME |
d99015b1 AH |
1103 | CFI_ADJUST_CFA_OFFSET 15*8 |
1104 | /* oldrax contains error code */ | |
0bd7b798 | 1105 | cld |
dcd072e2 AH |
1106 | CFI_MOVQ rdi, RDI+8 |
1107 | CFI_MOVQ rsi, RSI+8 | |
1108 | CFI_MOVQ rdx, RDX+8 | |
1109 | CFI_MOVQ rcx, RCX+8 | |
1110 | CFI_MOVQ rax, RAX+8 | |
1111 | CFI_MOVQ r8, R8+8 | |
1112 | CFI_MOVQ r9, R9+8 | |
1113 | CFI_MOVQ r10, R10+8 | |
1114 | CFI_MOVQ r11, R11+8 | |
1115 | CFI_MOVQ rbx, RBX+8 | |
1116 | CFI_MOVQ rbp, RBP+8 | |
1117 | CFI_MOVQ r12, R12+8 | |
1118 | CFI_MOVQ r13, R13+8 | |
1119 | CFI_MOVQ r14, R14+8 | |
1120 | CFI_MOVQ r15, R15+8 | |
0bd7b798 | 1121 | xorl %ebx,%ebx |
d99015b1 AH |
1122 | testl $3,CS+8(%rsp) |
1123 | je error_kernelspace | |
0bd7b798 | 1124 | error_swapgs: |
72fe4858 | 1125 | SWAPGS |
6b11d4ef AH |
1126 | error_sti: |
1127 | TRACE_IRQS_OFF | |
d99015b1 AH |
1128 | ret |
1129 | CFI_ENDPROC | |
1130 | ||
1131 | /* | |
1132 | * There are two places in the kernel that can potentially fault with | |
1133 | * usergs. Handle them here. The exception handlers after iret run with | |
1134 | * kernel gs again, so don't set the user space flag. B stepping K8s | |
1135 | * sometimes report an truncated RIP for IRET exceptions returning to | |
1136 | * compat mode. Check for these here too. | |
1137 | */ | |
1138 | error_kernelspace: | |
1139 | incl %ebx | |
1140 | leaq irq_return(%rip),%rcx | |
1141 | cmpq %rcx,RIP+8(%rsp) | |
1142 | je error_swapgs | |
1143 | movl %ecx,%ecx /* zero extend */ | |
1144 | cmpq %rcx,RIP+8(%rsp) | |
1145 | je error_swapgs | |
1146 | cmpq $gs_change,RIP+8(%rsp) | |
1147 | je error_swapgs | |
1148 | jmp error_sti | |
1149 | KPROBE_END(error_entry) | |
1150 | ||
1151 | ||
1152 | /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */ | |
1153 | KPROBE_ENTRY(error_exit) | |
dcd072e2 | 1154 | DEFAULT_FRAME |
10cd706d | 1155 | movl %ebx,%eax |
1da177e4 | 1156 | RESTORE_REST |
72fe4858 | 1157 | DISABLE_INTERRUPTS(CLBR_NONE) |
2601e64d | 1158 | TRACE_IRQS_OFF |
0bd7b798 | 1159 | GET_THREAD_INFO(%rcx) |
1da177e4 | 1160 | testl %eax,%eax |
d99015b1 | 1161 | jne retint_kernel |
10cd706d | 1162 | LOCKDEP_SYS_EXIT_IRQ |
d99015b1 AH |
1163 | movl TI_flags(%rcx),%edx |
1164 | movl $_TIF_WORK_MASK,%edi | |
1165 | andl %edi,%edx | |
1166 | jnz retint_careful | |
10cd706d | 1167 | jmp retint_swapgs |
1da177e4 | 1168 | CFI_ENDPROC |
d99015b1 | 1169 | KPROBE_END(error_exit) |
0bd7b798 | 1170 | |
1da177e4 | 1171 | /* Reload gs selector with exception handling */ |
0bd7b798 | 1172 | /* edi: new selector */ |
9f9d489a | 1173 | ENTRY(native_load_gs_index) |
7effaa88 | 1174 | CFI_STARTPROC |
1da177e4 | 1175 | pushf |
7effaa88 | 1176 | CFI_ADJUST_CFA_OFFSET 8 |
72fe4858 GOC |
1177 | DISABLE_INTERRUPTS(CLBR_ANY | ~(CLBR_RDI)) |
1178 | SWAPGS | |
0bd7b798 AH |
1179 | gs_change: |
1180 | movl %edi,%gs | |
1da177e4 | 1181 | 2: mfence /* workaround */ |
72fe4858 | 1182 | SWAPGS |
1da177e4 | 1183 | popf |
7effaa88 | 1184 | CFI_ADJUST_CFA_OFFSET -8 |
1da177e4 | 1185 | ret |
7effaa88 | 1186 | CFI_ENDPROC |
9f9d489a | 1187 | ENDPROC(native_load_gs_index) |
0bd7b798 | 1188 | |
1da177e4 LT |
1189 | .section __ex_table,"a" |
1190 | .align 8 | |
1191 | .quad gs_change,bad_gs | |
1192 | .previous | |
1193 | .section .fixup,"ax" | |
1194 | /* running with kernelgs */ | |
0bd7b798 | 1195 | bad_gs: |
72fe4858 | 1196 | SWAPGS /* switch back to user gs */ |
1da177e4 LT |
1197 | xorl %eax,%eax |
1198 | movl %eax,%gs | |
1199 | jmp 2b | |
0bd7b798 AH |
1200 | .previous |
1201 | ||
1da177e4 LT |
1202 | /* |
1203 | * Create a kernel thread. | |
1204 | * | |
1205 | * C extern interface: | |
1206 | * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
1207 | * | |
1208 | * asm input arguments: | |
1209 | * rdi: fn, rsi: arg, rdx: flags | |
1210 | */ | |
1211 | ENTRY(kernel_thread) | |
1212 | CFI_STARTPROC | |
1213 | FAKE_STACK_FRAME $child_rip | |
1214 | SAVE_ALL | |
1215 | ||
1216 | # rdi: flags, rsi: usp, rdx: will be &pt_regs | |
1217 | movq %rdx,%rdi | |
1218 | orq kernel_thread_flags(%rip),%rdi | |
1219 | movq $-1, %rsi | |
1220 | movq %rsp, %rdx | |
1221 | ||
1222 | xorl %r8d,%r8d | |
1223 | xorl %r9d,%r9d | |
0bd7b798 | 1224 | |
1da177e4 LT |
1225 | # clone now |
1226 | call do_fork | |
1227 | movq %rax,RAX(%rsp) | |
1228 | xorl %edi,%edi | |
1229 | ||
1230 | /* | |
1231 | * It isn't worth to check for reschedule here, | |
1232 | * so internally to the x86_64 port you can rely on kernel_thread() | |
1233 | * not to reschedule the child before returning, this avoids the need | |
1234 | * of hacks for example to fork off the per-CPU idle tasks. | |
0bd7b798 | 1235 | * [Hopefully no generic code relies on the reschedule -AK] |
1da177e4 LT |
1236 | */ |
1237 | RESTORE_ALL | |
1238 | UNFAKE_STACK_FRAME | |
1239 | ret | |
1240 | CFI_ENDPROC | |
4b787e0b | 1241 | ENDPROC(kernel_thread) |
0bd7b798 | 1242 | |
1da177e4 | 1243 | child_rip: |
c05991ed AK |
1244 | pushq $0 # fake return address |
1245 | CFI_STARTPROC | |
1da177e4 LT |
1246 | /* |
1247 | * Here we are in the child and the registers are set as they were | |
1248 | * at kernel_thread() invocation in the parent. | |
1249 | */ | |
1250 | movq %rdi, %rax | |
1251 | movq %rsi, %rdi | |
1252 | call *%rax | |
1253 | # exit | |
1c5b5cfd | 1254 | mov %eax, %edi |
1da177e4 | 1255 | call do_exit |
c05991ed | 1256 | CFI_ENDPROC |
4b787e0b | 1257 | ENDPROC(child_rip) |
1da177e4 LT |
1258 | |
1259 | /* | |
1260 | * execve(). This function needs to use IRET, not SYSRET, to set up all state properly. | |
1261 | * | |
1262 | * C extern interface: | |
1263 | * extern long execve(char *name, char **argv, char **envp) | |
1264 | * | |
1265 | * asm input arguments: | |
1266 | * rdi: name, rsi: argv, rdx: envp | |
1267 | * | |
1268 | * We want to fallback into: | |
5d119b2c | 1269 | * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs *regs) |
1da177e4 LT |
1270 | * |
1271 | * do_sys_execve asm fallback arguments: | |
5d119b2c | 1272 | * rdi: name, rsi: argv, rdx: envp, rcx: fake frame on the stack |
1da177e4 | 1273 | */ |
3db03b4a | 1274 | ENTRY(kernel_execve) |
1da177e4 LT |
1275 | CFI_STARTPROC |
1276 | FAKE_STACK_FRAME $0 | |
0bd7b798 | 1277 | SAVE_ALL |
5d119b2c | 1278 | movq %rsp,%rcx |
1da177e4 | 1279 | call sys_execve |
0bd7b798 | 1280 | movq %rax, RAX(%rsp) |
1da177e4 LT |
1281 | RESTORE_REST |
1282 | testq %rax,%rax | |
1283 | je int_ret_from_sys_call | |
1284 | RESTORE_ARGS | |
1285 | UNFAKE_STACK_FRAME | |
1286 | ret | |
1287 | CFI_ENDPROC | |
3db03b4a | 1288 | ENDPROC(kernel_execve) |
1da177e4 | 1289 | |
0f2fbdcb | 1290 | KPROBE_ENTRY(page_fault) |
1da177e4 | 1291 | errorentry do_page_fault |
d28c4393 | 1292 | KPROBE_END(page_fault) |
1da177e4 LT |
1293 | |
1294 | ENTRY(coprocessor_error) | |
1295 | zeroentry do_coprocessor_error | |
4b787e0b | 1296 | END(coprocessor_error) |
1da177e4 LT |
1297 | |
1298 | ENTRY(simd_coprocessor_error) | |
0bd7b798 | 1299 | zeroentry do_simd_coprocessor_error |
4b787e0b | 1300 | END(simd_coprocessor_error) |
1da177e4 LT |
1301 | |
1302 | ENTRY(device_not_available) | |
e407d620 | 1303 | zeroentry do_device_not_available |
4b787e0b | 1304 | END(device_not_available) |
1da177e4 LT |
1305 | |
1306 | /* runs on exception stack */ | |
0f2fbdcb | 1307 | KPROBE_ENTRY(debug) |
7effaa88 | 1308 | INTR_FRAME |
09402947 | 1309 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1310 | pushq $0 |
0bd7b798 | 1311 | CFI_ADJUST_CFA_OFFSET 8 |
5f8efbb9 | 1312 | paranoidentry do_debug, DEBUG_STACK |
2601e64d | 1313 | paranoidexit |
d28c4393 | 1314 | KPROBE_END(debug) |
1da177e4 | 1315 | |
0bd7b798 | 1316 | /* runs on exception stack */ |
eddb6fb9 | 1317 | KPROBE_ENTRY(nmi) |
7effaa88 | 1318 | INTR_FRAME |
09402947 | 1319 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1320 | pushq $-1 |
7effaa88 | 1321 | CFI_ADJUST_CFA_OFFSET 8 |
2601e64d IM |
1322 | paranoidentry do_nmi, 0, 0 |
1323 | #ifdef CONFIG_TRACE_IRQFLAGS | |
1324 | paranoidexit 0 | |
1325 | #else | |
1326 | jmp paranoid_exit1 | |
1327 | CFI_ENDPROC | |
1328 | #endif | |
d28c4393 | 1329 | KPROBE_END(nmi) |
6fefb0d1 | 1330 | |
0f2fbdcb | 1331 | KPROBE_ENTRY(int3) |
b556b35e | 1332 | INTR_FRAME |
09402947 | 1333 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
b556b35e JB |
1334 | pushq $0 |
1335 | CFI_ADJUST_CFA_OFFSET 8 | |
5f8efbb9 | 1336 | paranoidentry do_int3, DEBUG_STACK |
2601e64d | 1337 | jmp paranoid_exit1 |
b556b35e | 1338 | CFI_ENDPROC |
d28c4393 | 1339 | KPROBE_END(int3) |
1da177e4 LT |
1340 | |
1341 | ENTRY(overflow) | |
1342 | zeroentry do_overflow | |
4b787e0b | 1343 | END(overflow) |
1da177e4 LT |
1344 | |
1345 | ENTRY(bounds) | |
1346 | zeroentry do_bounds | |
4b787e0b | 1347 | END(bounds) |
1da177e4 LT |
1348 | |
1349 | ENTRY(invalid_op) | |
0bd7b798 | 1350 | zeroentry do_invalid_op |
4b787e0b | 1351 | END(invalid_op) |
1da177e4 LT |
1352 | |
1353 | ENTRY(coprocessor_segment_overrun) | |
1354 | zeroentry do_coprocessor_segment_overrun | |
4b787e0b | 1355 | END(coprocessor_segment_overrun) |
1da177e4 | 1356 | |
1da177e4 LT |
1357 | /* runs on exception stack */ |
1358 | ENTRY(double_fault) | |
7effaa88 | 1359 | XCPT_FRAME |
09402947 | 1360 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1361 | paranoidentry do_double_fault |
2601e64d | 1362 | jmp paranoid_exit1 |
1da177e4 | 1363 | CFI_ENDPROC |
4b787e0b | 1364 | END(double_fault) |
1da177e4 LT |
1365 | |
1366 | ENTRY(invalid_TSS) | |
1367 | errorentry do_invalid_TSS | |
4b787e0b | 1368 | END(invalid_TSS) |
1da177e4 LT |
1369 | |
1370 | ENTRY(segment_not_present) | |
1371 | errorentry do_segment_not_present | |
4b787e0b | 1372 | END(segment_not_present) |
1da177e4 LT |
1373 | |
1374 | /* runs on exception stack */ | |
1375 | ENTRY(stack_segment) | |
7effaa88 | 1376 | XCPT_FRAME |
09402947 | 1377 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1378 | paranoidentry do_stack_segment |
2601e64d | 1379 | jmp paranoid_exit1 |
1da177e4 | 1380 | CFI_ENDPROC |
4b787e0b | 1381 | END(stack_segment) |
1da177e4 | 1382 | |
0f2fbdcb | 1383 | KPROBE_ENTRY(general_protection) |
1da177e4 | 1384 | errorentry do_general_protection |
d28c4393 | 1385 | KPROBE_END(general_protection) |
1da177e4 LT |
1386 | |
1387 | ENTRY(alignment_check) | |
1388 | errorentry do_alignment_check | |
4b787e0b | 1389 | END(alignment_check) |
1da177e4 LT |
1390 | |
1391 | ENTRY(divide_error) | |
1392 | zeroentry do_divide_error | |
4b787e0b | 1393 | END(divide_error) |
1da177e4 LT |
1394 | |
1395 | ENTRY(spurious_interrupt_bug) | |
1396 | zeroentry do_spurious_interrupt_bug | |
4b787e0b | 1397 | END(spurious_interrupt_bug) |
1da177e4 LT |
1398 | |
1399 | #ifdef CONFIG_X86_MCE | |
1400 | /* runs on exception stack */ | |
1401 | ENTRY(machine_check) | |
7effaa88 | 1402 | INTR_FRAME |
09402947 | 1403 | PARAVIRT_ADJUST_EXCEPTION_FRAME |
1da177e4 | 1404 | pushq $0 |
0bd7b798 | 1405 | CFI_ADJUST_CFA_OFFSET 8 |
1da177e4 | 1406 | paranoidentry do_machine_check |
2601e64d | 1407 | jmp paranoid_exit1 |
1da177e4 | 1408 | CFI_ENDPROC |
4b787e0b | 1409 | END(machine_check) |
1da177e4 LT |
1410 | #endif |
1411 | ||
2699500b | 1412 | /* Call softirq on interrupt stack. Interrupts are off. */ |
ed6b676c | 1413 | ENTRY(call_softirq) |
7effaa88 | 1414 | CFI_STARTPROC |
2699500b AK |
1415 | push %rbp |
1416 | CFI_ADJUST_CFA_OFFSET 8 | |
1417 | CFI_REL_OFFSET rbp,0 | |
1418 | mov %rsp,%rbp | |
1419 | CFI_DEF_CFA_REGISTER rbp | |
ed6b676c | 1420 | incl %gs:pda_irqcount |
2699500b AK |
1421 | cmove %gs:pda_irqstackptr,%rsp |
1422 | push %rbp # backlink for old unwinder | |
ed6b676c | 1423 | call __do_softirq |
2699500b | 1424 | leaveq |
7effaa88 | 1425 | CFI_DEF_CFA_REGISTER rsp |
2699500b | 1426 | CFI_ADJUST_CFA_OFFSET -8 |
ed6b676c | 1427 | decl %gs:pda_irqcount |
ed6b676c | 1428 | ret |
7effaa88 | 1429 | CFI_ENDPROC |
4b787e0b | 1430 | ENDPROC(call_softirq) |
75154f40 AK |
1431 | |
1432 | KPROBE_ENTRY(ignore_sysret) | |
1433 | CFI_STARTPROC | |
1434 | mov $-ENOSYS,%eax | |
1435 | sysret | |
1436 | CFI_ENDPROC | |
1437 | ENDPROC(ignore_sysret) | |
3d75e1b8 JF |
1438 | |
1439 | #ifdef CONFIG_XEN | |
1440 | ENTRY(xen_hypervisor_callback) | |
1441 | zeroentry xen_do_hypervisor_callback | |
1442 | END(xen_hypervisor_callback) | |
1443 | ||
1444 | /* | |
1445 | # A note on the "critical region" in our callback handler. | |
1446 | # We want to avoid stacking callback handlers due to events occurring | |
1447 | # during handling of the last event. To do this, we keep events disabled | |
1448 | # until we've done all processing. HOWEVER, we must enable events before | |
1449 | # popping the stack frame (can't be done atomically) and so it would still | |
1450 | # be possible to get enough handler activations to overflow the stack. | |
1451 | # Although unlikely, bugs of that kind are hard to track down, so we'd | |
1452 | # like to avoid the possibility. | |
1453 | # So, on entry to the handler we detect whether we interrupted an | |
1454 | # existing activation in its critical region -- if so, we pop the current | |
1455 | # activation and restart the handler using the previous one. | |
1456 | */ | |
1457 | ENTRY(xen_do_hypervisor_callback) # do_hypervisor_callback(struct *pt_regs) | |
1458 | CFI_STARTPROC | |
1459 | /* Since we don't modify %rdi, evtchn_do_upall(struct *pt_regs) will | |
1460 | see the correct pointer to the pt_regs */ | |
1461 | movq %rdi, %rsp # we don't return, adjust the stack frame | |
1462 | CFI_ENDPROC | |
dcd072e2 | 1463 | DEFAULT_FRAME |
3d75e1b8 JF |
1464 | 11: incl %gs:pda_irqcount |
1465 | movq %rsp,%rbp | |
1466 | CFI_DEF_CFA_REGISTER rbp | |
1467 | cmovzq %gs:pda_irqstackptr,%rsp | |
1468 | pushq %rbp # backlink for old unwinder | |
1469 | call xen_evtchn_do_upcall | |
1470 | popq %rsp | |
1471 | CFI_DEF_CFA_REGISTER rsp | |
1472 | decl %gs:pda_irqcount | |
1473 | jmp error_exit | |
1474 | CFI_ENDPROC | |
1475 | END(do_hypervisor_callback) | |
1476 | ||
1477 | /* | |
1478 | # Hypervisor uses this for application faults while it executes. | |
1479 | # We get here for two reasons: | |
1480 | # 1. Fault while reloading DS, ES, FS or GS | |
1481 | # 2. Fault while executing IRET | |
1482 | # Category 1 we do not need to fix up as Xen has already reloaded all segment | |
1483 | # registers that could be reloaded and zeroed the others. | |
1484 | # Category 2 we fix up by killing the current process. We cannot use the | |
1485 | # normal Linux return path in this case because if we use the IRET hypercall | |
1486 | # to pop the stack frame we end up in an infinite loop of failsafe callbacks. | |
1487 | # We distinguish between categories by comparing each saved segment register | |
1488 | # with its current contents: any discrepancy means we in category 1. | |
1489 | */ | |
1490 | ENTRY(xen_failsafe_callback) | |
dcd072e2 AH |
1491 | INTR_FRAME 1 (6*8) |
1492 | /*CFI_REL_OFFSET gs,GS*/ | |
1493 | /*CFI_REL_OFFSET fs,FS*/ | |
1494 | /*CFI_REL_OFFSET es,ES*/ | |
1495 | /*CFI_REL_OFFSET ds,DS*/ | |
1496 | CFI_REL_OFFSET r11,8 | |
1497 | CFI_REL_OFFSET rcx,0 | |
3d75e1b8 JF |
1498 | movw %ds,%cx |
1499 | cmpw %cx,0x10(%rsp) | |
1500 | CFI_REMEMBER_STATE | |
1501 | jne 1f | |
1502 | movw %es,%cx | |
1503 | cmpw %cx,0x18(%rsp) | |
1504 | jne 1f | |
1505 | movw %fs,%cx | |
1506 | cmpw %cx,0x20(%rsp) | |
1507 | jne 1f | |
1508 | movw %gs,%cx | |
1509 | cmpw %cx,0x28(%rsp) | |
1510 | jne 1f | |
1511 | /* All segments match their saved values => Category 2 (Bad IRET). */ | |
1512 | movq (%rsp),%rcx | |
1513 | CFI_RESTORE rcx | |
1514 | movq 8(%rsp),%r11 | |
1515 | CFI_RESTORE r11 | |
1516 | addq $0x30,%rsp | |
1517 | CFI_ADJUST_CFA_OFFSET -0x30 | |
dcd072e2 AH |
1518 | CFI_PUSHQ $0 /* RIP */ |
1519 | CFI_PUSHQ %r11 | |
1520 | CFI_PUSHQ %rcx | |
4a5c3e77 | 1521 | jmp general_protection |
3d75e1b8 JF |
1522 | CFI_RESTORE_STATE |
1523 | 1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */ | |
1524 | movq (%rsp),%rcx | |
1525 | CFI_RESTORE rcx | |
1526 | movq 8(%rsp),%r11 | |
1527 | CFI_RESTORE r11 | |
1528 | addq $0x30,%rsp | |
1529 | CFI_ADJUST_CFA_OFFSET -0x30 | |
dcd072e2 | 1530 | CFI_PUSHQ $0 |
3d75e1b8 JF |
1531 | SAVE_ALL |
1532 | jmp error_exit | |
1533 | CFI_ENDPROC | |
3d75e1b8 JF |
1534 | END(xen_failsafe_callback) |
1535 | ||
1536 | #endif /* CONFIG_XEN */ |