2 * exceptions-amd64.c: exception support for AMD64
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
8 * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
19 #ifdef HAVE_UCONTEXT_H
23 #include <mono/arch/amd64/amd64-codegen.h>
24 #include <mono/metadata/abi-details.h>
25 #include <mono/metadata/appdomain.h>
26 #include <mono/metadata/tabledefs.h>
27 #include <mono/metadata/threads.h>
28 #include <mono/metadata/threads-types.h>
29 #include <mono/metadata/debug-helpers.h>
30 #include <mono/metadata/exception.h>
31 #include <mono/metadata/gc-internal.h>
32 #include <mono/metadata/mono-debug.h>
33 #include <mono/utils/mono-mmap.h>
36 #include "mini-amd64.h"
39 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
42 static MonoW32ExceptionHandler fpe_handler;
43 static MonoW32ExceptionHandler ill_handler;
44 static MonoW32ExceptionHandler segv_handler;
46 LPTOP_LEVEL_EXCEPTION_FILTER mono_old_win_toplevel_exception_filter;
47 void *mono_win_vectored_exception_handle;
49 #define W32_SEH_HANDLE_EX(_ex) \
50 if (_ex##_handler) _ex##_handler(0, ep, ctx)
52 static LONG CALLBACK seh_unhandled_exception_filter(EXCEPTION_POINTERS* ep)
54 #ifndef MONO_CROSS_COMPILE
55 if (mono_old_win_toplevel_exception_filter) {
56 return (*mono_old_win_toplevel_exception_filter)(ep);
60 mono_handle_native_sigsegv (SIGSEGV, NULL, NULL);
62 return EXCEPTION_CONTINUE_SEARCH;
66 * Unhandled Exception Filter
67 * Top-level per-process exception handler.
69 static LONG CALLBACK seh_vectored_exception_handler(EXCEPTION_POINTERS* ep)
74 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
76 /* If the thread is not managed by the runtime return early */
78 return EXCEPTION_CONTINUE_SEARCH;
80 jit_tls->mono_win_chained_exception_needs_run = FALSE;
81 res = EXCEPTION_CONTINUE_EXECUTION;
83 er = ep->ExceptionRecord;
84 ctx = ep->ContextRecord;
86 switch (er->ExceptionCode) {
87 case EXCEPTION_ACCESS_VIOLATION:
88 W32_SEH_HANDLE_EX(segv);
90 case EXCEPTION_ILLEGAL_INSTRUCTION:
91 W32_SEH_HANDLE_EX(ill);
93 case EXCEPTION_INT_DIVIDE_BY_ZERO:
94 case EXCEPTION_INT_OVERFLOW:
95 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
96 case EXCEPTION_FLT_OVERFLOW:
97 case EXCEPTION_FLT_UNDERFLOW:
98 case EXCEPTION_FLT_INEXACT_RESULT:
99 W32_SEH_HANDLE_EX(fpe);
102 jit_tls->mono_win_chained_exception_needs_run = TRUE;
106 if (jit_tls->mono_win_chained_exception_needs_run) {
107 /* Don't copy context back if we chained exception
108 * as the handler may have modfied the EXCEPTION_POINTERS
109 * directly. We don't pass sigcontext to chained handlers.
110 * Return continue search so the UnhandledExceptionFilter
111 * can correctly chain the exception.
113 res = EXCEPTION_CONTINUE_SEARCH;
119 void win32_seh_init()
121 mono_old_win_toplevel_exception_filter = SetUnhandledExceptionFilter(seh_unhandled_exception_filter);
122 mono_win_vectored_exception_handle = AddVectoredExceptionHandler (1, seh_vectored_exception_handler);
125 void win32_seh_cleanup()
129 if (mono_old_win_toplevel_exception_filter) SetUnhandledExceptionFilter(mono_old_win_toplevel_exception_filter);
131 ret = RemoveVectoredExceptionHandler (mono_win_vectored_exception_handle);
135 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
139 fpe_handler = handler;
142 ill_handler = handler;
145 segv_handler = handler;
152 #endif /* TARGET_WIN32 */
155 * mono_arch_get_restore_context:
157 * Returns a pointer to a method which restores a previously saved sigcontext.
160 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
162 guint8 *start = NULL;
164 MonoJumpInfo *ji = NULL;
165 GSList *unwind_ops = NULL;
167 /* restore_contect (MonoContext *ctx) */
169 start = code = mono_global_codeman_reserve (256);
171 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
173 /* Restore all registers except %rip and %r11 */
174 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rax), 8);
175 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rcx), 8);
176 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rdx), 8);
177 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rbx), 8);
178 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rbp), 8);
179 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rsi), 8);
180 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rdi), 8);
181 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r8), 8);
182 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r9), 8);
183 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r10), 8);
184 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r12), 8);
185 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r13), 8);
186 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r14), 8);
187 #if !defined(__native_client_codegen__)
188 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r15), 8);
192 * The context resides on the stack, in the stack frame of the
193 * caller of this function. The stack pointer that we need to
194 * restore is potentially many stack frames higher up, so the
195 * distance between them can easily be more than the red zone
196 * size. Hence the stack pointer can be restored only after
197 * we have finished loading everything from the context.
199 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rsp), 8);
200 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rip), 8);
201 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
203 /* jump to the saved IP */
204 amd64_jump_reg (code, AMD64_R11);
206 nacl_global_codeman_validate(&start, 256, &code);
208 mono_arch_flush_icache (start, code - start);
211 *info = mono_tramp_info_create ("restore_context", start, code - start, ji, unwind_ops);
217 * mono_arch_get_call_filter:
219 * Returns a pointer to a method which calls an exception filter. We
220 * also use this function to call finally handlers (we pass NULL as
221 * @exc object in this case).
224 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
230 MonoJumpInfo *ji = NULL;
231 GSList *unwind_ops = NULL;
232 const guint kMaxCodeSize = NACL_SIZE (128, 256);
234 start = code = mono_global_codeman_reserve (kMaxCodeSize);
236 /* call_filter (MonoContext *ctx, unsigned long eip) */
239 /* Alloc new frame */
240 amd64_push_reg (code, AMD64_RBP);
241 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
243 /* Save callee saved regs */
245 for (i = 0; i < AMD64_NREG; ++i)
246 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
247 amd64_push_reg (code, i);
253 amd64_push_reg (code, AMD64_RBP);
255 /* Make stack misaligned, the call will make it aligned again */
257 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
260 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rbp), 8);
261 /* load callee saved regs */
262 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rbx), 8);
263 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r12), 8);
264 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r13), 8);
265 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r14), 8);
266 #if !defined(__native_client_codegen__)
267 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r15), 8);
270 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rdi), 8);
271 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rsi), 8);
274 /* call the handler */
275 amd64_call_reg (code, AMD64_ARG_REG2);
278 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
281 amd64_pop_reg (code, AMD64_RBP);
283 /* Restore callee saved regs */
284 for (i = AMD64_NREG; i >= 0; --i)
285 if (AMD64_IS_CALLEE_SAVED_REG (i))
286 amd64_pop_reg (code, i);
291 g_assert ((code - start) < kMaxCodeSize);
293 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
295 mono_arch_flush_icache (start, code - start);
298 *info = mono_tramp_info_create ("call_filter", start, code - start, ji, unwind_ops);
304 * The first few arguments are dummy, to force the other arguments to be passed on
305 * the stack, this avoids overwriting the argument registers in the throw trampoline.
308 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
309 guint64 dummy5, guint64 dummy6,
310 mgreg_t *regs, mgreg_t rip,
311 MonoObject *exc, gboolean rethrow)
315 ctx.rsp = regs [AMD64_RSP];
317 ctx.rbx = regs [AMD64_RBX];
318 ctx.rbp = regs [AMD64_RBP];
319 ctx.r12 = regs [AMD64_R12];
320 ctx.r13 = regs [AMD64_R13];
321 ctx.r14 = regs [AMD64_R14];
322 ctx.r15 = regs [AMD64_R15];
323 ctx.rdi = regs [AMD64_RDI];
324 ctx.rsi = regs [AMD64_RSI];
325 ctx.rax = regs [AMD64_RAX];
326 ctx.rcx = regs [AMD64_RCX];
327 ctx.rdx = regs [AMD64_RDX];
329 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
330 MonoException *mono_ex = (MonoException*)exc;
332 mono_ex->stack_trace = NULL;
335 /* adjust eip so that it point into the call instruction */
338 mono_handle_exception (&ctx, exc);
339 mono_restore_context (&ctx);
340 g_assert_not_reached ();
344 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
345 guint64 dummy5, guint64 dummy6,
346 mgreg_t *regs, mgreg_t rip,
347 guint32 ex_token_index, gint64 pc_offset)
349 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
352 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
356 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
359 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, regs, rip, (MonoObject*)ex, FALSE);
363 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
364 guint64 dummy5, guint64 dummy6,
365 mgreg_t *regs, mgreg_t rip,
366 guint32 dummy7, gint64 dummy8)
368 /* Only the register parameters are valid */
371 ctx.rsp = regs [AMD64_RSP];
373 ctx.rbx = regs [AMD64_RBX];
374 ctx.rbp = regs [AMD64_RBP];
375 ctx.r12 = regs [AMD64_R12];
376 ctx.r13 = regs [AMD64_R13];
377 ctx.r14 = regs [AMD64_R14];
378 ctx.r15 = regs [AMD64_R15];
379 ctx.rdi = regs [AMD64_RDI];
380 ctx.rsi = regs [AMD64_RSI];
381 ctx.rax = regs [AMD64_RAX];
382 ctx.rcx = regs [AMD64_RCX];
383 ctx.rdx = regs [AMD64_RDX];
385 mono_resume_unwind (&ctx);
389 * get_throw_trampoline:
391 * Generate a call to mono_amd64_throw_exception/
392 * mono_amd64_throw_corlib_exception.
395 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
399 MonoJumpInfo *ji = NULL;
400 GSList *unwind_ops = NULL;
401 int i, stack_size, arg_offsets [16], regs_offset, dummy_stack_space;
402 const guint kMaxCodeSize = NACL_SIZE (256, 512);
405 dummy_stack_space = 6 * sizeof(mgreg_t); /* Windows expects stack space allocated for all 6 dummy args. */
407 dummy_stack_space = 0;
410 start = code = mono_global_codeman_reserve (kMaxCodeSize);
412 /* The stack is unaligned on entry */
413 stack_size = 192 + 8 + dummy_stack_space;
418 unwind_ops = mono_arch_get_cie_program ();
421 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
423 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
426 * To hide linux/windows calling convention differences, we pass all arguments on
427 * the stack by passing 6 dummy values in registers.
430 arg_offsets [0] = dummy_stack_space + 0;
431 arg_offsets [1] = dummy_stack_space + sizeof(mgreg_t);
432 arg_offsets [2] = dummy_stack_space + sizeof(mgreg_t) * 2;
433 arg_offsets [3] = dummy_stack_space + sizeof(mgreg_t) * 3;
434 regs_offset = dummy_stack_space + sizeof(mgreg_t) * 4;
437 for (i = 0; i < AMD64_NREG; ++i)
439 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
441 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof(mgreg_t));
442 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof(mgreg_t)), X86_EAX, sizeof(mgreg_t));
443 /* Set arg1 == regs */
444 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, regs_offset);
445 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, sizeof(mgreg_t));
446 /* Set arg2 == eip */
448 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
450 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, sizeof(mgreg_t));
451 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_RAX, sizeof(mgreg_t));
452 /* Set arg3 == exc/ex_token_index */
454 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, sizeof(mgreg_t));
456 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG1, sizeof(mgreg_t));
457 /* Set arg4 == rethrow/pc offset */
459 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], 0, sizeof(mgreg_t));
461 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [3], AMD64_ARG_REG2, sizeof(mgreg_t));
464 * The caller is LLVM code which passes the absolute address not a pc offset,
465 * so compensate by passing 0 as 'rip' and passing the negated abs address as
468 amd64_neg_membase (code, AMD64_RSP, arg_offsets [3]);
470 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], rethrow, sizeof(mgreg_t));
474 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, corlib ? "mono_amd64_throw_corlib_exception" : "mono_amd64_throw_exception");
475 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
477 amd64_mov_reg_imm (code, AMD64_R11, resume_unwind ? ((gpointer)mono_amd64_resume_unwind) : (corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception));
479 amd64_call_reg (code, AMD64_R11);
480 amd64_breakpoint (code);
482 mono_arch_flush_icache (start, code - start);
484 g_assert ((code - start) < kMaxCodeSize);
486 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
489 *info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
495 * mono_arch_get_throw_exception:
497 * Returns a function pointer which can be used to raise
498 * exceptions. The returned function has the following
499 * signature: void (*func) (MonoException *exc);
503 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
505 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
509 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
511 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
515 * mono_arch_get_throw_corlib_exception:
517 * Returns a function pointer which can be used to raise
518 * corlib exceptions. The returned function has the following
519 * signature: void (*func) (guint32 ex_token, guint32 offset);
520 * Here, offset is the offset which needs to be substracted from the caller IP
521 * to get the IP of the throw. Passing the offset has the advantage that it
522 * needs no relocations in the caller.
525 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
527 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
531 * mono_arch_find_jit_info:
533 * This function is used to gather information from @ctx, and store it in @frame_info.
534 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
535 * is modified if needed.
536 * Returns TRUE on success, FALSE otherwise.
539 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
540 MonoJitInfo *ji, MonoContext *ctx,
541 MonoContext *new_ctx, MonoLMF **lmf,
542 mgreg_t **save_locations,
543 StackFrameInfo *frame)
545 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
547 memset (frame, 0, sizeof (StackFrameInfo));
553 mgreg_t regs [MONO_MAX_IREGS + 1];
555 guint32 unwind_info_len;
557 guint8 *epilog = NULL;
559 frame->type = FRAME_TYPE_MANAGED;
561 unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
563 frame->unwind_info = unwind_info;
564 frame->unwind_info_len = unwind_info_len;
567 printf ("%s %p %p\n", ji->d.method->name, ji->code_start, ip);
568 mono_print_unwind_info (unwind_info, unwind_info_len);
570 /* LLVM compiled code doesn't have this info */
571 if (ji->has_arch_eh_info)
572 epilog = (guint8*)ji->code_start + ji->code_size - mono_jinfo_get_epilog_size (ji);
574 regs [AMD64_RAX] = new_ctx->rax;
575 regs [AMD64_RBX] = new_ctx->rbx;
576 regs [AMD64_RCX] = new_ctx->rcx;
577 regs [AMD64_RDX] = new_ctx->rdx;
578 regs [AMD64_RBP] = new_ctx->rbp;
579 regs [AMD64_RSP] = new_ctx->rsp;
580 regs [AMD64_RSI] = new_ctx->rsi;
581 regs [AMD64_RDI] = new_ctx->rdi;
582 regs [AMD64_RIP] = new_ctx->rip;
583 regs [AMD64_R12] = new_ctx->r12;
584 regs [AMD64_R13] = new_ctx->r13;
585 regs [AMD64_R14] = new_ctx->r14;
586 regs [AMD64_R15] = new_ctx->r15;
588 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
589 (guint8*)ji->code_start + ji->code_size,
590 ip, epilog ? &epilog : NULL, regs, MONO_MAX_IREGS + 1,
591 save_locations, MONO_MAX_IREGS, &cfa);
593 new_ctx->rax = regs [AMD64_RAX];
594 new_ctx->rbx = regs [AMD64_RBX];
595 new_ctx->rcx = regs [AMD64_RCX];
596 new_ctx->rdx = regs [AMD64_RDX];
597 new_ctx->rbp = regs [AMD64_RBP];
598 new_ctx->rsp = regs [AMD64_RSP];
599 new_ctx->rsi = regs [AMD64_RSI];
600 new_ctx->rdi = regs [AMD64_RDI];
601 new_ctx->rip = regs [AMD64_RIP];
602 new_ctx->r12 = regs [AMD64_R12];
603 new_ctx->r13 = regs [AMD64_R13];
604 new_ctx->r14 = regs [AMD64_R14];
605 new_ctx->r15 = regs [AMD64_R15];
607 /* The CFA becomes the new SP value */
608 new_ctx->rsp = (mgreg_t)cfa;
617 if (((guint64)(*lmf)->previous_lmf) & 2) {
619 * This LMF entry is created by the soft debug code to mark transitions to
620 * managed code done during invokes.
622 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
624 g_assert (ext->debugger_invoke);
626 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
628 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
630 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
635 if (((guint64)(*lmf)->previous_lmf) & 1) {
636 /* This LMF has the rip field set */
638 } else if ((*lmf)->rsp == 0) {
643 * The rsp field is set just before the call which transitioned to native
644 * code. Obtain the rip from the stack.
646 rip = *(guint64*)((*lmf)->rsp - sizeof(mgreg_t));
649 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
651 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
652 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
663 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
666 new_ctx->rbp = (*lmf)->rbp;
667 new_ctx->rsp = (*lmf)->rsp;
669 if (((guint64)(*lmf)->previous_lmf) & 4) {
670 MonoLMFTramp *ext = (MonoLMFTramp*)(*lmf);
672 /* Trampoline frame */
673 new_ctx->rbx = ext->regs [AMD64_RBX];
674 new_ctx->r12 = ext->regs [AMD64_R12];
675 new_ctx->r13 = ext->regs [AMD64_R13];
676 new_ctx->r14 = ext->regs [AMD64_R14];
677 new_ctx->r15 = ext->regs [AMD64_R15];
679 new_ctx->rdi = ext->regs [AMD64_RDI];
680 new_ctx->rsi = ext->regs [AMD64_RSI];
684 * The registers saved in the LMF will be restored using the normal unwind info,
685 * when the wrapper frame is processed.
698 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
709 * Called by resuming from a signal handler.
712 handle_signal_exception (gpointer obj)
714 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
717 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
719 mono_handle_exception (&ctx, obj);
721 mono_restore_context (&ctx);
725 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
727 guint64 sp = ctx->rsp;
729 ctx->rdi = (guint64)user_data;
731 /* Allocate a stack frame below the red zone */
733 /* The stack should be unaligned */
737 /* Preserve the call chain to prevent crashes in the libgcc unwinder (#15969) */
738 *(guint64*)sp = ctx->rip;
741 ctx->rip = (guint64)async_cb;
745 * mono_arch_handle_exception:
747 * @ctx: saved processor state
748 * @obj: the exception object
751 mono_arch_handle_exception (void *sigctx, gpointer obj)
753 #if defined(MONO_ARCH_USE_SIGACTION)
757 * Handling the exception in the signal handler is problematic, since the original
758 * signal is disabled, and we could run arbitrary code though the debugger. So
759 * resume into the normal stack and do most work there if possible.
761 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
763 /* Pass the ctx parameter in TLS */
764 mono_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
766 mctx = jit_tls->ex_ctx;
767 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
768 mono_monoctx_to_sigctx (&mctx, sigctx);
774 mono_sigctx_to_monoctx (sigctx, &mctx);
776 mono_handle_exception (&mctx, obj);
778 mono_monoctx_to_sigctx (&mctx, sigctx);
785 mono_arch_ip_from_context (void *sigctx)
787 #if defined(MONO_ARCH_USE_SIGACTION)
788 ucontext_t *ctx = (ucontext_t*)sigctx;
790 return (gpointer)UCONTEXT_REG_RIP (ctx);
791 #elif defined(HOST_WIN32)
792 return ((CONTEXT*)sigctx)->Rip;
794 MonoContext *ctx = sigctx;
795 return (gpointer)ctx->rip;
800 restore_soft_guard_pages (void)
802 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
803 if (jit_tls->stack_ovf_guard_base)
804 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
808 * this function modifies mctx so that when it is restored, it
809 * won't execcute starting at mctx.eip, but in a function that
810 * will restore the protection on the soft-guard pages and return back to
811 * continue at mctx.eip.
814 prepare_for_guard_pages (MonoContext *mctx)
817 sp = (gpointer)(mctx->rsp);
819 /* the return addr */
820 sp [0] = (gpointer)(mctx->rip);
821 mctx->rip = (guint64)restore_soft_guard_pages;
822 mctx->rsp = (guint64)sp;
826 altstack_handle_and_restore (MonoContext *ctx, gpointer obj, gboolean stack_ovf)
832 mono_handle_exception (&mctx, obj);
834 prepare_for_guard_pages (&mctx);
835 mono_restore_context (&mctx);
839 mono_arch_handle_altstack_exception (void *sigctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, gpointer fault_addr, gboolean stack_ovf)
841 #if defined(MONO_ARCH_USE_SIGACTION)
842 MonoException *exc = NULL;
843 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
846 MonoContext *copied_ctx;
849 exc = mono_domain_get ()->stack_overflow_ex;
851 mono_handle_native_sigsegv (SIGSEGV, sigctx, siginfo);
853 /* setup a call frame on the real stack so that control is returned there
854 * and exception handling can continue.
855 * The frame looks like:
859 * 128 is the size of the red zone
861 frame_size = sizeof (MonoContext) + sizeof (gpointer) * 4 + 128;
864 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
865 sp = (gpointer)((char*)sp - frame_size);
866 copied_ctx = (MonoContext*)(sp + 4);
867 /* the arguments must be aligned */
868 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
869 mono_sigctx_to_monoctx (sigctx, copied_ctx);
870 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
871 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
872 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
873 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(copied_ctx);
874 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
875 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
880 mono_amd64_get_original_ip (void)
882 MonoLMF *lmf = mono_get_lmf ();
886 /* Reset the change to previous_lmf */
887 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
893 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
895 guint8 *code, *start;
897 gpointer throw_trampoline;
898 MonoJumpInfo *ji = NULL;
899 GSList *unwind_ops = NULL;
900 const guint kMaxCodeSize = NACL_SIZE (128, 256);
902 start = code = mono_global_codeman_reserve (kMaxCodeSize);
904 /* We are in the frame of a managed method after a call */
906 * We would like to throw the pending exception in such a way that it looks to
907 * be thrown from the managed method.
910 /* Save registers which might contain the return value of the call */
911 amd64_push_reg (code, AMD64_RAX);
912 amd64_push_reg (code, AMD64_RDX);
914 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
915 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
918 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
920 /* Obtain the pending exception */
922 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
923 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
925 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
927 amd64_call_reg (code, AMD64_R11);
929 /* Check if it is NULL, and branch */
930 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
931 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
933 /* exc != NULL branch */
935 /* Save the exc on the stack */
936 amd64_push_reg (code, AMD64_RAX);
938 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
940 /* Obtain the original ip and clear the flag in previous_lmf */
942 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
943 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
945 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
947 amd64_call_reg (code, AMD64_R11);
950 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
952 /* Pop saved stuff from the stack */
953 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
955 /* Setup arguments for the throw trampoline */
957 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
958 /* The trampoline expects the caller ip to be pushed on the stack */
959 amd64_push_reg (code, AMD64_RAX);
961 /* Call the throw trampoline */
963 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_throw_exception");
964 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
966 throw_trampoline = mono_get_throw_exception ();
967 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
969 /* We use a jump instead of a call so we can push the original ip on the stack */
970 amd64_jump_reg (code, AMD64_R11);
972 /* ex == NULL branch */
973 mono_amd64_patch (br [0], code);
975 /* Obtain the original ip and clear the flag in previous_lmf */
977 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
978 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
980 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
982 amd64_call_reg (code, AMD64_R11);
983 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
985 /* Restore registers */
986 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
987 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
988 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
989 amd64_pop_reg (code, AMD64_RDX);
990 amd64_pop_reg (code, AMD64_RAX);
992 /* Return to original code */
993 amd64_jump_reg (code, AMD64_R11);
995 g_assert ((code - start) < kMaxCodeSize);
997 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1000 *info = mono_tramp_info_create ("throw_pending_exception", start, code - start, ji, unwind_ops);
1005 static gpointer throw_pending_exception;
1008 * Called when a thread receives an async exception while executing unmanaged code.
1009 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1010 * the return address on the stack to point to a helper routine which throws the
1014 mono_arch_notify_pending_exc (MonoThreadInfo *info)
1016 MonoLMF *lmf = mono_get_lmf ();
1019 lmf = mono_get_lmf ();
1021 g_assert (info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].valid);
1022 lmf = info->thread_saved_state [ASYNC_SUSPEND_STATE_INDEX].unwind_data [MONO_UNWIND_DATA_LMF];
1026 /* Not yet started */
1033 if ((guint64)lmf->previous_lmf & 1)
1034 /* Already hijacked or trampoline LMF entry */
1037 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1038 lmf->rip = *(guint64*)(lmf->rsp - 8);
1039 /* Signal that lmf->rip is set */
1040 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1042 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1046 mono_amd64_get_exception_trampolines (gboolean aot)
1048 MonoTrampInfo *info;
1049 GSList *tramps = NULL;
1051 mono_arch_get_throw_pending_exception (&info, aot);
1052 tramps = g_slist_prepend (tramps, info);
1054 /* LLVM needs different throw trampolines */
1055 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1056 tramps = g_slist_prepend (tramps, info);
1058 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1059 tramps = g_slist_prepend (tramps, info);
1061 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1062 tramps = g_slist_prepend (tramps, info);
1068 mono_arch_exceptions_init (void)
1073 if (mono_aot_only) {
1074 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1075 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1076 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1077 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1078 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1079 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1080 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1082 /* Call this to avoid initialization races */
1083 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1085 tramps = mono_amd64_get_exception_trampolines (FALSE);
1086 for (l = tramps; l; l = l->next) {
1087 MonoTrampInfo *info = l->data;
1089 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1090 mono_tramp_info_register (info);
1092 g_slist_free (tramps);
1099 * The mono_arch_unwindinfo* methods are used to build and add
1100 * function table info for each emitted method from mono. On Winx64
1101 * the seh handler will not be called if the mono methods are not
1102 * added to the function table.
1104 * We should not need to add non-volatile register info to the
1105 * table since mono stores that info elsewhere. (Except for the register
1109 #define MONO_MAX_UNWIND_CODES 22
1111 typedef union _UNWIND_CODE {
1114 guchar UnwindOp : 4;
1117 gushort FrameOffset;
1118 } UNWIND_CODE, *PUNWIND_CODE;
1120 typedef struct _UNWIND_INFO {
1123 guchar SizeOfProlog;
1124 guchar CountOfCodes;
1125 guchar FrameRegister : 4;
1126 guchar FrameOffset : 4;
1127 /* custom size for mono allowing for mono allowing for*/
1128 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1129 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1130 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1131 /*UWOP_PUSH_NONVOL offset = 15-0*/
1132 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1134 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1136 * OPTIONAL ULONG ExceptionHandler;
1137 * OPTIONAL ULONG FunctionEntry;
1139 * OPTIONAL ULONG ExceptionData[]; */
1140 } UNWIND_INFO, *PUNWIND_INFO;
1144 RUNTIME_FUNCTION runtimeFunction;
1145 UNWIND_INFO unwindInfo;
1146 } MonoUnwindInfo, *PMonoUnwindInfo;
1149 mono_arch_unwindinfo_create (gpointer* monoui)
1151 PMonoUnwindInfo newunwindinfo;
1152 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1153 newunwindinfo->unwindInfo.Version = 1;
1157 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1159 PMonoUnwindInfo unwindinfo;
1160 PUNWIND_CODE unwindcode;
1163 mono_arch_unwindinfo_create (monoui);
1165 unwindinfo = (MonoUnwindInfo*)*monoui;
1167 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1168 g_error ("Larger allocation needed for the unwind information.");
1170 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1171 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1172 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1173 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1174 unwindcode->OpInfo = reg;
1176 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1177 g_error ("Adding unwind info in wrong order.");
1179 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1183 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1185 PMonoUnwindInfo unwindinfo;
1186 PUNWIND_CODE unwindcode;
1189 mono_arch_unwindinfo_create (monoui);
1191 unwindinfo = (MonoUnwindInfo*)*monoui;
1193 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1194 g_error ("Larger allocation needed for the unwind information.");
1196 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1197 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1198 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1200 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1201 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1202 unwindcode->OpInfo = reg;
1204 unwindinfo->unwindInfo.FrameRegister = reg;
1206 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1207 g_error ("Adding unwind info in wrong order.");
1209 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1213 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1215 PMonoUnwindInfo unwindinfo;
1216 PUNWIND_CODE unwindcode;
1220 mono_arch_unwindinfo_create (monoui);
1222 unwindinfo = (MonoUnwindInfo*)*monoui;
1225 g_error ("Stack allocation must be equal to or greater than 0x8.");
1229 else if (size <= 0x7FFF8)
1234 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1235 g_error ("Larger allocation needed for the unwind information.");
1237 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1238 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1240 if (codesneeded == 1) {
1241 /*The size of the allocation is
1242 (the number in the OpInfo member) times 8 plus 8*/
1243 unwindcode->OpInfo = (size - 8)/8;
1244 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1247 if (codesneeded == 3) {
1248 /*the unscaled size of the allocation is recorded
1249 in the next two slots in little-endian format*/
1250 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1252 unwindcode->OpInfo = 1;
1255 /*the size of the allocation divided by 8
1256 is recorded in the next slot*/
1257 unwindcode->FrameOffset = size/8;
1259 unwindcode->OpInfo = 0;
1262 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1265 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1267 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1268 g_error ("Adding unwind info in wrong order.");
1270 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1274 mono_arch_unwindinfo_get_size (gpointer monoui)
1276 PMonoUnwindInfo unwindinfo;
1280 unwindinfo = (MonoUnwindInfo*)monoui;
1281 return (8 + sizeof (MonoUnwindInfo)) -
1282 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1285 static PRUNTIME_FUNCTION
1286 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1290 PMonoUnwindInfo targetinfo;
1291 MonoDomain *domain = mono_domain_get ();
1293 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1297 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1299 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1301 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1303 return &targetinfo->runtimeFunction;
1307 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1309 PMonoUnwindInfo unwindinfo, targetinfo;
1311 guint64 targetlocation;
1315 unwindinfo = (MonoUnwindInfo*)*monoui;
1316 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1317 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1319 unwindinfo->runtimeFunction.EndAddress = code_size;
1320 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1322 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1324 codecount = unwindinfo->unwindInfo.CountOfCodes;
1326 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1327 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1330 g_free (unwindinfo);
1333 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1338 #if MONO_SUPPORT_TASKLETS
1339 MonoContinuationRestore
1340 mono_tasklets_arch_restore (void)
1342 static guint8* saved = NULL;
1343 guint8 *code, *start;
1344 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1345 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1349 return (MonoContinuationRestore)saved;
1350 code = start = mono_global_codeman_reserve (kMaxCodeSize);
1351 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1352 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1353 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1354 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1355 * We move cont to cont_reg since we need both rcx and rdi for the copy
1356 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1358 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1359 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1360 /* setup the copy of the stack */
1361 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1362 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1364 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1365 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1366 amd64_prefix (code, X86_REP_PREFIX);
1369 /* now restore the registers from the LMF */
1371 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1372 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, MONO_STRUCT_OFFSET (MonoLMF, rsp), 8);
1374 /* restore the lmf chain */
1375 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1376 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1378 /* state is already in rax */
1379 amd64_jump_membase (code, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_ip));
1380 g_assert ((code - start) <= kMaxCodeSize);
1382 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1385 return (MonoContinuationRestore)saved;
1390 * mono_arch_setup_resume_sighandler_ctx:
1392 * Setup CTX so execution continues at FUNC.
1395 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1398 * When resuming from a signal handler, the stack should be misaligned, just like right after
1401 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1402 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1403 MONO_CONTEXT_SET_IP (ctx, func);