1 #ifdef LISP_FEATURE_SB_THREAD
2 #include <mach/mach_init.h>
9 #include "x86-64-darwin-os.h"
10 #include "genesis/fdefn.h"
12 #include <mach/mach.h>
13 #include <mach/mach_error.h>
14 #include <mach/mach_types.h>
15 #include <mach/sync_policy.h>
16 #include <mach/machine/thread_state.h>
17 #include <mach/machine/thread_status.h>
18 #include <sys/_types.h>
19 #include <sys/ucontext.h>
26 #include <sys/_structs.h>
31 typedef struct __darwin_ucontext darwin_ucontext
;
32 typedef struct __darwin_mcontext64 darwin_mcontext
;
45 #define faultvaddr __faultvaddr
50 #define fpu_fcw __fpu_fcw
51 #define fpu_mxcsr __fpu_mxcsr
55 typedef struct ucontext darwin_ucontext
;
56 typedef struct mcontext darwin_mcontext
;
60 #ifdef LISP_FEATURE_SB_THREAD
61 pthread_mutex_t mach_exception_lock
= PTHREAD_MUTEX_INITIALIZER
;
64 #ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
66 void sigill_handler(int signal
, siginfo_t
*siginfo
, os_context_t
*context
);
67 void sigtrap_handler(int signal
, siginfo_t
*siginfo
, os_context_t
*context
);
68 void memory_fault_handler(int signal
, siginfo_t
*siginfo
,
69 os_context_t
*context
);
71 /* This executes in the faulting thread as part of the signal
72 * emulation. It is passed a context with the uc_mcontext field
73 * pointing to a valid block of memory. */
74 void build_fake_signal_context(darwin_ucontext
*context
,
75 x86_thread_state64_t
*thread_state
,
76 x86_float_state64_t
*float_state
) {
77 thread_sigmask(0, NULL
, &context
->uc_sigmask
);
78 context
->uc_mcontext
->ss
= *thread_state
;
79 context
->uc_mcontext
->fs
= *float_state
;
82 /* This executes in the faulting thread as part of the signal
83 * emulation. It is effectively the inverse operation from above. */
84 void update_thread_state_from_context(x86_thread_state64_t
*thread_state
,
85 x86_float_state64_t
*float_state
,
86 darwin_ucontext
*context
) {
87 *thread_state
= context
->uc_mcontext
->ss
;
88 *float_state
= context
->uc_mcontext
->fs
;
89 thread_sigmask(SIG_SETMASK
, &context
->uc_sigmask
, NULL
);
92 /* Modify a context to push new data on its stack. */
93 void push_context(u64 data
, x86_thread_state64_t
*context
)
97 stack_pointer
= (u64
*) context
->rsp
;
98 *(--stack_pointer
) = data
;
99 context
->rsp
= (u64
) stack_pointer
;
102 void align_context_stack(x86_thread_state64_t
*context
)
104 /* 16byte align the stack (provided that the stack is, as it
105 * should be, 8byte aligned. */
106 while (context
->rsp
& 15) push_context(0, context
);
109 /* Stack allocation starts with a context that has a mod-4 ESP value
110 * and needs to leave a context with a mod-16 ESP that will restore
111 * the old ESP value and other register state when activated. The
112 * first part of this is the recovery trampoline, which loads ESP from
113 * EBP, pops EBP, and returns. */
114 asm(".globl _stack_allocation_recover; \
116 _stack_allocation_recover: \
117 lea -48(%rbp), %rsp; \
127 void open_stack_allocation(x86_thread_state64_t
*context
)
129 void stack_allocation_recover(void);
131 push_context(context
->rip
, context
);
132 push_context(context
->rbp
, context
);
133 context
->rbp
= context
->rsp
;
135 push_context(context
->r9
, context
);
136 push_context(context
->r8
, context
);
137 push_context(context
->rcx
, context
);
138 push_context(context
->rdx
, context
);
139 push_context(context
->rsi
, context
);
140 push_context(context
->rdi
, context
);
142 context
->rip
= (u64
) stack_allocation_recover
;
144 align_context_stack(context
);
147 /* Stack allocation of data starts with a context with a mod-16 ESP
148 * value and reserves some space on it by manipulating the ESP
150 void *stack_allocate(x86_thread_state64_t
*context
, size_t size
)
152 /* round up size to 16byte multiple */
153 size
= (size
+ 15) & -16;
155 context
->rsp
= ((u64
)context
->rsp
) - size
;
157 return (void *)context
->rsp
;
160 /* Arranging to invoke a C function is tricky, as we have to assume
161 * cdecl calling conventions (caller removes args) and x86/darwin
162 * alignment requirements. The simplest way to arrange this,
163 * actually, is to open a new stack allocation.
164 * WARNING!!! THIS DOES NOT PRESERVE REGISTERS! */
165 void call_c_function_in_context(x86_thread_state64_t
*context
,
174 /* Set up to restore stack on exit. */
175 open_stack_allocation(context
);
177 /* Have to keep stack 16byte aligned on x86/darwin. */
178 for (i
= (1 & -nargs
); i
; i
--) {
179 push_context(0, context
);
182 context
->rsp
= ((u64
)context
->rsp
) - nargs
* 8;
183 stack_pointer
= (u64
*)context
->rsp
;
186 if (nargs
> 0) context
->rdi
= va_arg(ap
, u64
);
187 if (nargs
> 1) context
->rsi
= va_arg(ap
, u64
);
188 if (nargs
> 2) context
->rdx
= va_arg(ap
, u64
);
189 if (nargs
> 3) context
->rcx
= va_arg(ap
, u64
);
190 if (nargs
> 4) context
->r8
= va_arg(ap
, u64
);
191 if (nargs
> 5) context
->r9
= va_arg(ap
, u64
);
192 for (i
= 6; i
< nargs
; i
++) {
193 stack_pointer
[i
] = va_arg(ap
, u64
);
197 push_context(context
->rip
, context
);
198 context
->rip
= (u64
) function
;
201 void signal_emulation_wrapper(x86_thread_state64_t
*thread_state
,
202 x86_float_state64_t
*float_state
,
205 void (*handler
)(int, siginfo_t
*, void *))
208 darwin_ucontext context
;
209 darwin_mcontext regs
;
211 context
.uc_mcontext
= ®s
;
213 /* when BSD signals are fired, they mask they signals in sa_mask
214 which always seem to be the blockable_sigset, for us, so we
216 1) save the current sigmask
217 2) block blockable signals
218 3) call the signal handler
219 4) restore the sigmask */
221 build_fake_signal_context(&context
, thread_state
, float_state
);
223 block_blockable_signals(0);
225 handler(signal
, siginfo
, &context
);
227 update_thread_state_from_context(thread_state
, float_state
, &context
);
229 /* Trap to restore the signal context. */
230 asm volatile (".quad 0xffffffffffff0b0f"
231 : : "a" (thread_state
), "b" (float_state
));
234 #if defined DUMP_CONTEXT
235 void dump_context(x86_thread_state64_t
*context
)
240 printf("rax: %08lx rcx: %08lx rdx: %08lx rbx: %08lx\n",
241 context
->rax
, context
->rcx
, context
->rdx
, context
->rbx
);
242 printf("rsp: %08lx rbp: %08lx rsi: %08lx rdi: %08lx\n",
243 context
->rsp
, context
->rbp
, context
->rsi
, context
->rdi
);
244 printf("rip: %08lx eflags: %08lx\n",
245 context
->rip
, context
->rflags
);
246 printf("cs: %04hx ds: %04hx es: %04hx "
247 "ss: %04hx fs: %04hx gs: %04hx\n",
248 context
->cs
, context
->ds
, context
->rs
,
249 context
->ss
, context
->fs
, context
->gs
);
251 stack_pointer
= (u64
*)context
->rsp
;
252 for (i
= 0; i
< 48; i
+=4) {
253 printf("%08x: %08x %08x %08x %08x\n",
254 context
->rsp
+ (i
* 4),
264 control_stack_exhausted_handler(int signal
, siginfo_t
*siginfo
,
265 os_context_t
*context
) {
266 extern void unblock_signals_in_context_and_maybe_warn(os_context_t
*);
267 unblock_signals_in_context_and_maybe_warn(context
);
268 arrange_return_to_lisp_function
269 (context
, StaticSymbolFunction(CONTROL_STACK_EXHAUSTED_ERROR
));
273 undefined_alien_handler(int signal
, siginfo_t
*siginfo
, os_context_t
*context
) {
274 arrange_return_to_lisp_function
275 (context
, StaticSymbolFunction(UNDEFINED_ALIEN_VARIABLE_ERROR
));
279 catch_exception_raise(mach_port_t exception_port
,
282 exception_type_t exception
,
283 exception_data_t code_vector
,
284 mach_msg_type_number_t code_count
)
286 kern_return_t ret
, dealloc_ret
;
290 #ifdef LISP_FEATURE_SB_THREAD
291 thread_mutex_lock(&mach_exception_lock
);
294 x86_thread_state64_t thread_state
;
295 mach_msg_type_number_t thread_state_count
= x86_THREAD_STATE64_COUNT
;
297 x86_float_state64_t float_state
;
298 mach_msg_type_number_t float_state_count
= x86_FLOAT_STATE64_COUNT
;
300 x86_exception_state64_t exception_state
;
301 mach_msg_type_number_t exception_state_count
= x86_EXCEPTION_STATE64_COUNT
;
303 x86_thread_state64_t backup_thread_state
;
304 x86_thread_state64_t
*target_thread_state
;
305 x86_float_state64_t
*target_float_state
;
307 os_vm_address_t addr
;
311 FSHOW((stderr
,"/entering catch_exception_raise with exception: %d\n", exception
));
312 if (mach_port_get_context(mach_task_self(), exception_port
, &th
) != KERN_SUCCESS
) {
313 lose("Can't find the thread for an exception %p", exception_port
);
320 ret
= thread_get_state(thread
,
322 (thread_state_t
)&thread_state
,
323 &thread_state_count
);
324 ret
= thread_get_state(thread
,
326 (thread_state_t
)&float_state
,
328 ret
= thread_get_state(thread
,
329 x86_EXCEPTION_STATE64
,
330 (thread_state_t
)&exception_state
,
331 &exception_state_count
);
332 addr
= (void*)exception_state
.faultvaddr
;
333 /* note the os_context hackery here. When the signal handler returns,
334 * it won't go back to what it was doing ... */
335 if(addr
>= CONTROL_STACK_GUARD_PAGE(th
) &&
336 addr
< CONTROL_STACK_GUARD_PAGE(th
) + os_vm_page_size
) {
337 /* We hit the end of the control stack: disable guard page
338 * protection so the error handler has some headroom, protect the
339 * previous page so that we can catch returns from the guard page
341 lower_thread_control_stack_guard_page(th
);
343 backup_thread_state
= thread_state
;
344 open_stack_allocation(&thread_state
);
345 /* Reserve a 256 byte zone for signal handlers
346 * to use on the interrupted thread stack.
348 stack_allocate(&thread_state
, 256);
350 /* Save thread state */
351 target_thread_state
=
352 stack_allocate(&thread_state
, sizeof(*target_thread_state
));
353 (*target_thread_state
) = backup_thread_state
;
355 /* Save float state */
357 stack_allocate(&thread_state
, sizeof(*target_float_state
));
358 (*target_float_state
) = float_state
;
361 siginfo
= stack_allocate(&thread_state
, sizeof(*siginfo
));
362 /* what do we need to put in our fake siginfo? It looks like
363 * the x86 code only uses si_signo and si_adrr. */
364 siginfo
->si_signo
= signal
;
365 siginfo
->si_addr
= (void*)exception_state
.faultvaddr
;
367 call_c_function_in_context(&thread_state
,
368 signal_emulation_wrapper
,
374 control_stack_exhausted_handler
);
376 else if(addr
>= CONTROL_STACK_RETURN_GUARD_PAGE(th
) &&
377 addr
< CONTROL_STACK_RETURN_GUARD_PAGE(th
) + os_vm_page_size
) {
378 /* We're returning from the guard page: reprotect it, and
379 * unprotect this one. This works even if we somehow missed
380 * the return-guard-page, and hit it on our way to new
381 * exhaustion instead. */
382 reset_thread_control_stack_guard_page(th
);
384 else if (addr
>= undefined_alien_address
&&
385 addr
< undefined_alien_address
+ os_vm_page_size
) {
386 backup_thread_state
= thread_state
;
387 open_stack_allocation(&thread_state
);
388 stack_allocate(&thread_state
, 256);
390 /* Save thread state */
391 target_thread_state
=
392 stack_allocate(&thread_state
, sizeof(*target_thread_state
));
393 (*target_thread_state
) = backup_thread_state
;
396 stack_allocate(&thread_state
, sizeof(*target_float_state
));
397 (*target_float_state
) = float_state
;
400 siginfo
= stack_allocate(&thread_state
, sizeof(*siginfo
));
401 /* what do we need to put in our fake siginfo? It looks like
402 * the x86 code only uses si_signo and si_adrr. */
403 siginfo
->si_signo
= signal
;
404 siginfo
->si_addr
= (void*)exception_state
.faultvaddr
;
406 call_c_function_in_context(&thread_state
,
407 signal_emulation_wrapper
,
413 undefined_alien_handler
);
416 backup_thread_state
= thread_state
;
417 open_stack_allocation(&thread_state
);
418 stack_allocate(&thread_state
, 256);
420 /* Save thread state */
421 target_thread_state
=
422 stack_allocate(&thread_state
, sizeof(*target_thread_state
));
423 (*target_thread_state
) = backup_thread_state
;
426 stack_allocate(&thread_state
, sizeof(*target_float_state
));
427 (*target_float_state
) = float_state
;
430 siginfo
= stack_allocate(&thread_state
, sizeof(*siginfo
));
431 /* what do we need to put in our fake siginfo? It looks like
432 * the x86 code only uses si_signo and si_adrr. */
433 siginfo
->si_signo
= signal
;
434 siginfo
->si_addr
= (void*)exception_state
.faultvaddr
;
436 call_c_function_in_context(&thread_state
,
437 signal_emulation_wrapper
,
443 memory_fault_handler
);
445 ret
= thread_set_state(thread
,
447 (thread_state_t
)&thread_state
,
450 ret
= thread_set_state(thread
,
452 (thread_state_t
)&float_state
,
454 #ifdef LISP_FEATURE_SB_THREAD
455 thread_mutex_unlock(&mach_exception_lock
);
460 case EXC_BAD_INSTRUCTION
:
462 ret
= thread_get_state(thread
,
464 (thread_state_t
)&thread_state
,
465 &thread_state_count
);
466 ret
= thread_get_state(thread
,
468 (thread_state_t
)&float_state
,
470 ret
= thread_get_state(thread
,
471 x86_EXCEPTION_STATE64
,
472 (thread_state_t
)&exception_state
,
473 &exception_state_count
);
474 if (0xffffffffffff0b0f == *((u64
*)thread_state
.rip
)) {
475 /* fake sigreturn. */
477 /* When we get here, thread_state.rax is a pointer to a
478 * thread_state to restore. */
479 /* thread_state = *((thread_state_t *)thread_state.rax); */
481 ret
= thread_set_state(thread
,
483 (thread_state_t
) thread_state
.rax
,
487 ret
= thread_set_state(thread
,
489 (thread_state_t
) thread_state
.rbx
,
494 backup_thread_state
= thread_state
;
495 open_stack_allocation(&thread_state
);
496 stack_allocate(&thread_state
, 256);
498 /* Save thread state */
499 target_thread_state
=
500 stack_allocate(&thread_state
, sizeof(*target_thread_state
));
501 (*target_thread_state
) = backup_thread_state
;
504 stack_allocate(&thread_state
, sizeof(*target_float_state
));
505 (*target_float_state
) = float_state
;
508 siginfo
= stack_allocate(&thread_state
, sizeof(*siginfo
));
509 /* what do we need to put in our fake siginfo? It looks like
510 * the x86 code only uses si_signo and si_adrr. */
511 if (*((unsigned short *)target_thread_state
->rip
) == 0x0b0f) {
513 siginfo
->si_signo
= signal
;
514 siginfo
->si_addr
= (void*)exception_state
.faultvaddr
;
515 target_thread_state
->rip
+= 2;
516 call_c_function_in_context(&thread_state
,
517 signal_emulation_wrapper
,
526 siginfo
->si_signo
= signal
;
527 siginfo
->si_addr
= (void*)exception_state
.faultvaddr
;
529 call_c_function_in_context(&thread_state
,
530 signal_emulation_wrapper
,
538 ret
= thread_set_state(thread
,
540 (thread_state_t
)&thread_state
,
542 ret
= thread_set_state(thread
,
544 (thread_state_t
)&float_state
,
547 #ifdef LISP_FEATURE_SB_THREAD
548 thread_mutex_unlock(&mach_exception_lock
);
554 #ifdef LISP_FEATURE_SB_THREAD
555 thread_mutex_unlock(&mach_exception_lock
);
557 ret
= KERN_INVALID_RIGHT
;
560 dealloc_ret
= mach_port_deallocate (mach_task_self(), thread
);
562 lose("mach_port_deallocate (thread) failed with return_code %d\n", dealloc_ret
);
565 dealloc_ret
= mach_port_deallocate (mach_task_self(), task
);
567 lose("mach_port_deallocate (task) failed with return_code %d\n", dealloc_ret
);
574 os_restore_fp_control(os_context_t
*context
)
576 /* KLUDGE: The x87 FPU control word is some nasty bitfield struct
577 * thing. Rather than deal with that, just grab it as a 16-bit
579 unsigned short fpu_control_word
=
580 *((unsigned short *)&context
->uc_mcontext
->fs
.fpu_fcw
);
581 /* reset exception flags and restore control flags on SSE2 FPU */
582 unsigned int temp
= (context
->uc_mcontext
->fs
.fpu_mxcsr
) & ~0x3F;
583 asm ("ldmxcsr %0" : : "m" (temp
));
584 /* same for x87 FPU. */
585 asm ("fldcw %0" : : "m" (fpu_control_word
));