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)
13 #if _WIN32_WINNT < 0x0501
14 /* Required for Vectored Exception Handling. */
16 #define _WIN32_WINNT 0x0501
17 #endif /* _WIN32_WINNT < 0x0501 */
22 #ifdef HAVE_UCONTEXT_H
26 #include <mono/arch/amd64/amd64-codegen.h>
27 #include <mono/metadata/appdomain.h>
28 #include <mono/metadata/tabledefs.h>
29 #include <mono/metadata/threads.h>
30 #include <mono/metadata/threads-types.h>
31 #include <mono/metadata/debug-helpers.h>
32 #include <mono/metadata/exception.h>
33 #include <mono/metadata/gc-internal.h>
34 #include <mono/metadata/mono-debug.h>
35 #include <mono/utils/mono-mmap.h>
38 #include "mini-amd64.h"
40 #include "debug-mini.h"
42 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
45 static MonoW32ExceptionHandler fpe_handler;
46 static MonoW32ExceptionHandler ill_handler;
47 static MonoW32ExceptionHandler segv_handler;
49 LPTOP_LEVEL_EXCEPTION_FILTER mono_old_win_toplevel_exception_filter;
50 guint64 mono_win_vectored_exception_handle;
51 extern gboolean mono_win_chained_exception_needs_run;
53 #define W32_SEH_HANDLE_EX(_ex) \
54 if (_ex##_handler) _ex##_handler(0, ep, sctx)
56 LONG CALLBACK seh_unhandled_exception_filter(EXCEPTION_POINTERS* ep)
58 #ifndef MONO_CROSS_COMPILE
59 if (mono_old_win_toplevel_exception_filter) {
60 return (*mono_old_win_toplevel_exception_filter)(ep);
64 mono_handle_native_sigsegv (SIGSEGV, NULL);
66 return EXCEPTION_CONTINUE_SEARCH;
70 * Unhandled Exception Filter
71 * Top-level per-process exception handler.
73 LONG CALLBACK seh_vectored_exception_handler(EXCEPTION_POINTERS* ep)
80 mono_win_chained_exception_needs_run = FALSE;
81 res = EXCEPTION_CONTINUE_EXECUTION;
83 er = ep->ExceptionRecord;
84 ctx = ep->ContextRecord;
85 sctx = g_malloc(sizeof(MonoContext));
87 /* Copy Win32 context to UNIX style context */
100 sctx->r15 = ctx->R15;
102 switch (er->ExceptionCode) {
103 case EXCEPTION_ACCESS_VIOLATION:
104 W32_SEH_HANDLE_EX(segv);
106 case EXCEPTION_ILLEGAL_INSTRUCTION:
107 W32_SEH_HANDLE_EX(ill);
109 case EXCEPTION_INT_DIVIDE_BY_ZERO:
110 case EXCEPTION_INT_OVERFLOW:
111 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
112 case EXCEPTION_FLT_OVERFLOW:
113 case EXCEPTION_FLT_UNDERFLOW:
114 case EXCEPTION_FLT_INEXACT_RESULT:
115 W32_SEH_HANDLE_EX(fpe);
121 if (mono_win_chained_exception_needs_run) {
122 /* Don't copy context back if we chained exception
123 * as the handler may have modfied the EXCEPTION_POINTERS
124 * directly. We don't pass sigcontext to chained handlers.
125 * Return continue search so the UnhandledExceptionFilter
126 * can correctly chain the exception.
128 res = EXCEPTION_CONTINUE_SEARCH;
130 /* Copy context back */
132 ctx->Rsp = sctx->rsp;
133 ctx->Rdi = sctx->rdi;
134 ctx->Rsi = sctx->rsi;
135 ctx->Rbx = sctx->rbx;
136 ctx->Rbp = sctx->rbp;
137 ctx->R12 = sctx->r12;
138 ctx->R13 = sctx->r13;
139 ctx->R14 = sctx->r14;
140 ctx->R15 = sctx->r15;
141 ctx->Rip = sctx->rip;
143 /* Volatile But should not matter?*/
144 ctx->Rax = sctx->rax;
145 ctx->Rcx = sctx->rcx;
146 ctx->Rdx = sctx->rdx;
149 /* TODO: Find right place to free this in stack overflow case */
150 if (er->ExceptionCode != EXCEPTION_STACK_OVERFLOW)
156 void win32_seh_init()
158 mono_old_win_toplevel_exception_filter = SetUnhandledExceptionFilter(seh_unhandled_exception_filter);
159 mono_win_vectored_exception_handle = AddVectoredExceptionHandler (1, seh_vectored_exception_handler);
162 void win32_seh_cleanup()
164 if (mono_old_win_toplevel_exception_filter) SetUnhandledExceptionFilter(mono_old_win_toplevel_exception_filter);
168 ret = RemoveVectoredExceptionHandler (mono_win_vectored_exception_handle);
172 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
176 fpe_handler = handler;
179 ill_handler = handler;
182 segv_handler = handler;
189 #endif /* TARGET_WIN32 */
192 * mono_arch_get_restore_context:
194 * Returns a pointer to a method which restores a previously saved sigcontext.
197 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
199 guint8 *start = NULL;
201 MonoJumpInfo *ji = NULL;
202 GSList *unwind_ops = NULL;
204 /* restore_contect (MonoContext *ctx) */
206 start = code = mono_global_codeman_reserve (256);
208 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
210 /* Restore all registers except %rip and %r11 */
211 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rax), 8);
212 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rcx), 8);
213 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdx), 8);
214 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbx), 8);
215 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbp), 8);
216 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsi), 8);
217 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdi), 8);
218 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r8), 8);
219 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r9), 8);
220 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r10), 8);
221 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r12), 8);
222 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r13), 8);
223 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r14), 8);
224 #if !defined(__native_client_codegen__)
225 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r15), 8);
228 if (mono_running_on_valgrind ()) {
229 /* Prevent 'Address 0x... is just below the stack ptr.' errors */
230 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
231 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
232 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
234 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
235 /* get return address */
236 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
239 /* jump to the saved IP */
240 amd64_jump_reg (code, AMD64_R11);
242 nacl_global_codeman_validate(&start, 256, &code);
244 mono_arch_flush_icache (start, code - start);
247 *info = mono_tramp_info_create ("restore_context", start, code - start, ji, unwind_ops);
253 * mono_arch_get_call_filter:
255 * Returns a pointer to a method which calls an exception filter. We
256 * also use this function to call finally handlers (we pass NULL as
257 * @exc object in this case).
260 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
266 MonoJumpInfo *ji = NULL;
267 GSList *unwind_ops = NULL;
268 const guint kMaxCodeSize = NACL_SIZE (128, 256);
270 start = code = mono_global_codeman_reserve (kMaxCodeSize);
272 /* call_filter (MonoContext *ctx, unsigned long eip) */
275 /* Alloc new frame */
276 amd64_push_reg (code, AMD64_RBP);
277 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
279 /* Save callee saved regs */
281 for (i = 0; i < AMD64_NREG; ++i)
282 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
283 amd64_push_reg (code, i);
289 amd64_push_reg (code, AMD64_RBP);
291 /* Make stack misaligned, the call will make it aligned again */
293 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
296 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
297 /* load callee saved regs */
298 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
299 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
300 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
301 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
302 #if !defined(__native_client_codegen__)
303 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
306 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
307 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
310 /* call the handler */
311 amd64_call_reg (code, AMD64_ARG_REG2);
314 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
317 amd64_pop_reg (code, AMD64_RBP);
319 /* Restore callee saved regs */
320 for (i = AMD64_NREG; i >= 0; --i)
321 if (AMD64_IS_CALLEE_SAVED_REG (i))
322 amd64_pop_reg (code, i);
327 g_assert ((code - start) < kMaxCodeSize);
329 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
331 mono_arch_flush_icache (start, code - start);
334 *info = mono_tramp_info_create ("call_filter", start, code - start, ji, unwind_ops);
340 * The first few arguments are dummy, to force the other arguments to be passed on
341 * the stack, this avoids overwriting the argument registers in the throw trampoline.
344 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
345 guint64 dummy5, guint64 dummy6,
346 mgreg_t *regs, mgreg_t rip,
347 MonoObject *exc, gboolean rethrow)
349 static void (*restore_context) (MonoContext *);
352 if (!restore_context)
353 restore_context = mono_get_restore_context ();
355 ctx.rsp = regs [AMD64_RSP];
357 ctx.rbx = regs [AMD64_RBX];
358 ctx.rbp = regs [AMD64_RBP];
359 ctx.r12 = regs [AMD64_R12];
360 ctx.r13 = regs [AMD64_R13];
361 ctx.r14 = regs [AMD64_R14];
362 ctx.r15 = regs [AMD64_R15];
363 ctx.rdi = regs [AMD64_RDI];
364 ctx.rsi = regs [AMD64_RSI];
365 ctx.rax = regs [AMD64_RAX];
366 ctx.rcx = regs [AMD64_RCX];
367 ctx.rdx = regs [AMD64_RDX];
369 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
370 MonoException *mono_ex = (MonoException*)exc;
372 mono_ex->stack_trace = NULL;
375 if (mono_debug_using_mono_debugger ()) {
378 mono_breakpoint_clean_code (NULL, (gpointer)rip, 8, buf, sizeof (buf));
380 if (buf [3] == 0xe8) {
381 MonoContext ctx_cp = ctx;
382 ctx_cp.rip = rip - 5;
384 if (mono_debugger_handle_exception (&ctx_cp, exc)) {
385 restore_context (&ctx_cp);
386 g_assert_not_reached ();
391 /* adjust eip so that it point into the call instruction */
394 mono_handle_exception (&ctx, exc);
395 restore_context (&ctx);
397 g_assert_not_reached ();
401 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
402 guint64 dummy5, guint64 dummy6,
403 mgreg_t *regs, mgreg_t rip,
404 guint32 ex_token_index, gint64 pc_offset)
406 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
409 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
413 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
416 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, regs, rip, (MonoObject*)ex, FALSE);
420 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
421 guint64 dummy5, guint64 dummy6,
422 mgreg_t *regs, mgreg_t rip,
423 guint32 dummy7, gint64 dummy8)
425 /* Only the register parameters are valid */
428 ctx.rsp = regs [AMD64_RSP];
430 ctx.rbx = regs [AMD64_RBX];
431 ctx.rbp = regs [AMD64_RBP];
432 ctx.r12 = regs [AMD64_R12];
433 ctx.r13 = regs [AMD64_R13];
434 ctx.r14 = regs [AMD64_R14];
435 ctx.r15 = regs [AMD64_R15];
436 ctx.rdi = regs [AMD64_RDI];
437 ctx.rsi = regs [AMD64_RSI];
438 ctx.rax = regs [AMD64_RAX];
439 ctx.rcx = regs [AMD64_RCX];
440 ctx.rdx = regs [AMD64_RDX];
442 mono_resume_unwind (&ctx);
446 * get_throw_trampoline:
448 * Generate a call to mono_amd64_throw_exception/
449 * mono_amd64_throw_corlib_exception.
452 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
456 MonoJumpInfo *ji = NULL;
457 GSList *unwind_ops = NULL;
458 int i, stack_size, arg_offsets [16], regs_offset, dummy_stack_space;
459 const guint kMaxCodeSize = NACL_SIZE (256, 512);
462 dummy_stack_space = 6 * sizeof(mgreg_t); /* Windows expects stack space allocated for all 6 dummy args. */
464 dummy_stack_space = 0;
467 start = code = mono_global_codeman_reserve (kMaxCodeSize);
469 /* The stack is unaligned on entry */
470 stack_size = 192 + 8 + dummy_stack_space;
475 unwind_ops = mono_arch_get_cie_program ();
478 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
480 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
483 * To hide linux/windows calling convention differences, we pass all arguments on
484 * the stack by passing 6 dummy values in registers.
487 arg_offsets [0] = dummy_stack_space + 0;
488 arg_offsets [1] = dummy_stack_space + sizeof(mgreg_t);
489 arg_offsets [2] = dummy_stack_space + sizeof(mgreg_t) * 2;
490 arg_offsets [3] = dummy_stack_space + sizeof(mgreg_t) * 3;
491 regs_offset = dummy_stack_space + sizeof(mgreg_t) * 4;
494 for (i = 0; i < AMD64_NREG; ++i)
496 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
498 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof(mgreg_t));
499 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof(mgreg_t)), X86_EAX, sizeof(mgreg_t));
500 /* Set arg1 == regs */
501 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, regs_offset);
502 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, sizeof(mgreg_t));
503 /* Set arg2 == eip */
505 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
507 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, sizeof(mgreg_t));
508 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_RAX, sizeof(mgreg_t));
509 /* Set arg3 == exc/ex_token_index */
511 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, sizeof(mgreg_t));
513 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG1, sizeof(mgreg_t));
514 /* Set arg4 == rethrow/pc offset */
516 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], 0, sizeof(mgreg_t));
518 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [3], AMD64_ARG_REG2, sizeof(mgreg_t));
521 * The caller is LLVM code which passes the absolute address not a pc offset,
522 * so compensate by passing 0 as 'rip' and passing the negated abs address as
525 amd64_neg_membase (code, AMD64_RSP, arg_offsets [3]);
527 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], rethrow, sizeof(mgreg_t));
531 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");
532 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
534 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));
536 amd64_call_reg (code, AMD64_R11);
537 amd64_breakpoint (code);
539 mono_arch_flush_icache (start, code - start);
541 g_assert ((code - start) < kMaxCodeSize);
543 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
546 *info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
552 * mono_arch_get_throw_exception:
554 * Returns a function pointer which can be used to raise
555 * exceptions. The returned function has the following
556 * signature: void (*func) (MonoException *exc);
560 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
562 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
566 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
568 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
572 * mono_arch_get_throw_corlib_exception:
574 * Returns a function pointer which can be used to raise
575 * corlib exceptions. The returned function has the following
576 * signature: void (*func) (guint32 ex_token, guint32 offset);
577 * Here, offset is the offset which needs to be substracted from the caller IP
578 * to get the IP of the throw. Passing the offset has the advantage that it
579 * needs no relocations in the caller.
582 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
584 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
588 * mono_arch_find_jit_info:
590 * This function is used to gather information from @ctx, and store it in @frame_info.
591 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
592 * is modified if needed.
593 * Returns TRUE on success, FALSE otherwise.
596 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
597 MonoJitInfo *ji, MonoContext *ctx,
598 MonoContext *new_ctx, MonoLMF **lmf,
599 mgreg_t **save_locations,
600 StackFrameInfo *frame)
602 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
604 memset (frame, 0, sizeof (StackFrameInfo));
610 mgreg_t regs [MONO_MAX_IREGS + 1];
612 guint32 unwind_info_len;
615 frame->type = FRAME_TYPE_MANAGED;
618 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
620 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
622 frame->unwind_info = unwind_info;
623 frame->unwind_info_len = unwind_info_len;
625 regs [AMD64_RAX] = new_ctx->rax;
626 regs [AMD64_RBX] = new_ctx->rbx;
627 regs [AMD64_RCX] = new_ctx->rcx;
628 regs [AMD64_RDX] = new_ctx->rdx;
629 regs [AMD64_RBP] = new_ctx->rbp;
630 regs [AMD64_RSP] = new_ctx->rsp;
631 regs [AMD64_RSI] = new_ctx->rsi;
632 regs [AMD64_RDI] = new_ctx->rdi;
633 regs [AMD64_RIP] = new_ctx->rip;
634 regs [AMD64_R12] = new_ctx->r12;
635 regs [AMD64_R13] = new_ctx->r13;
636 regs [AMD64_R14] = new_ctx->r14;
637 regs [AMD64_R15] = new_ctx->r15;
639 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
640 (guint8*)ji->code_start + ji->code_size,
641 ip, regs, MONO_MAX_IREGS + 1,
642 save_locations, MONO_MAX_IREGS, &cfa);
644 new_ctx->rax = regs [AMD64_RAX];
645 new_ctx->rbx = regs [AMD64_RBX];
646 new_ctx->rcx = regs [AMD64_RCX];
647 new_ctx->rdx = regs [AMD64_RDX];
648 new_ctx->rbp = regs [AMD64_RBP];
649 new_ctx->rsp = regs [AMD64_RSP];
650 new_ctx->rsi = regs [AMD64_RSI];
651 new_ctx->rdi = regs [AMD64_RDI];
652 new_ctx->rip = regs [AMD64_RIP];
653 new_ctx->r12 = regs [AMD64_R12];
654 new_ctx->r13 = regs [AMD64_R13];
655 new_ctx->r14 = regs [AMD64_R14];
656 new_ctx->r15 = regs [AMD64_R15];
658 /* The CFA becomes the new SP value */
659 new_ctx->rsp = (mgreg_t)cfa;
664 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
665 /* remove any unused lmf */
666 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
669 #ifndef MONO_AMD64_NO_PUSHES
670 /* Pop arguments off the stack */
671 if (ji->has_arch_eh_info)
672 new_ctx->rsp += mono_jit_info_get_arch_eh_info (ji)->stack_size;
679 if (((guint64)(*lmf)->previous_lmf) & 2) {
681 * This LMF entry is created by the soft debug code to mark transitions to
682 * managed code done during invokes.
684 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
686 g_assert (ext->debugger_invoke);
688 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
690 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
692 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
697 if (((guint64)(*lmf)->previous_lmf) & 1) {
698 /* This LMF has the rip field set */
700 } else if ((*lmf)->rsp == 0) {
705 * The rsp field is set just before the call which transitioned to native
706 * code. Obtain the rip from the stack.
708 rip = *(guint64*)((*lmf)->rsp - sizeof(mgreg_t));
711 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
713 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
714 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
725 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
728 new_ctx->rbp = (*lmf)->rbp;
729 new_ctx->rsp = (*lmf)->rsp;
731 new_ctx->rbx = (*lmf)->rbx;
732 new_ctx->r12 = (*lmf)->r12;
733 new_ctx->r13 = (*lmf)->r13;
734 new_ctx->r14 = (*lmf)->r14;
735 new_ctx->r15 = (*lmf)->r15;
737 new_ctx->rdi = (*lmf)->rdi;
738 new_ctx->rsi = (*lmf)->rsi;
741 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
752 * Called by resuming from a signal handler.
755 handle_signal_exception (gpointer obj)
757 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
759 static void (*restore_context) (MonoContext *);
761 if (!restore_context)
762 restore_context = mono_get_restore_context ();
764 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
766 if (mono_debugger_handle_exception (&ctx, (MonoObject *)obj))
769 mono_handle_exception (&ctx, obj);
771 restore_context (&ctx);
775 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
777 guint64 sp = ctx->rsp;
779 ctx->rdi = (guint64)user_data;
781 /* Allocate a stack frame below the red zone */
783 /* The stack should be unaligned */
787 ctx->rip = (guint64)async_cb;
791 * mono_arch_handle_exception:
793 * @ctx: saved processor state
794 * @obj: the exception object
797 mono_arch_handle_exception (void *sigctx, gpointer obj)
799 #if defined(MONO_ARCH_USE_SIGACTION)
803 * Handling the exception in the signal handler is problematic, since the original
804 * signal is disabled, and we could run arbitrary code though the debugger. So
805 * resume into the normal stack and do most work there if possible.
807 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
809 /* Pass the ctx parameter in TLS */
810 mono_arch_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
812 mctx = jit_tls->ex_ctx;
813 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
814 mono_monoctx_to_sigctx (&mctx, sigctx);
820 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
822 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
825 mono_handle_exception (&mctx, obj);
827 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
834 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
836 mono_sigctx_to_monoctx (sigctx, mctx);
840 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
842 mono_monoctx_to_sigctx (mctx, sigctx);
846 mono_arch_ip_from_context (void *sigctx)
848 #if defined(MONO_ARCH_USE_SIGACTION)
849 ucontext_t *ctx = (ucontext_t*)sigctx;
851 return (gpointer)UCONTEXT_REG_RIP (ctx);
853 MonoContext *ctx = sigctx;
854 return (gpointer)ctx->rip;
859 restore_soft_guard_pages (void)
861 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
862 if (jit_tls->stack_ovf_guard_base)
863 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
867 * this function modifies mctx so that when it is restored, it
868 * won't execcute starting at mctx.eip, but in a function that
869 * will restore the protection on the soft-guard pages and return back to
870 * continue at mctx.eip.
873 prepare_for_guard_pages (MonoContext *mctx)
876 sp = (gpointer)(mctx->rsp);
878 /* the return addr */
879 sp [0] = (gpointer)(mctx->rip);
880 mctx->rip = (guint64)restore_soft_guard_pages;
881 mctx->rsp = (guint64)sp;
885 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
887 void (*restore_context) (MonoContext *);
890 restore_context = mono_get_restore_context ();
891 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
893 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
895 prepare_for_guard_pages (&mctx);
896 restore_context (&mctx);
899 mono_handle_exception (&mctx, obj);
901 prepare_for_guard_pages (&mctx);
902 restore_context (&mctx);
906 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
908 #if defined(MONO_ARCH_USE_SIGACTION)
909 MonoException *exc = NULL;
910 ucontext_t *ctx = (ucontext_t*)sigctx;
911 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
914 ucontext_t *copied_ctx;
917 exc = mono_domain_get ()->stack_overflow_ex;
919 mono_handle_native_sigsegv (SIGSEGV, sigctx);
921 /* setup a call frame on the real stack so that control is returned there
922 * and exception handling can continue.
923 * The frame looks like:
927 * 128 is the size of the red zone
929 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
931 frame_size += sizeof (*ctx->uc_mcontext);
935 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
936 sp = (gpointer)((char*)sp - frame_size);
937 copied_ctx = (ucontext_t*)(sp + 4);
938 /* the arguments must be aligned */
939 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
940 /* may need to adjust pointers in the new struct copy, depending on the OS */
941 memcpy (copied_ctx, ctx, sizeof (ucontext_t));
944 guint8 * copied_mcontext = (guint8*)copied_ctx + sizeof (ucontext_t);
945 /* uc_mcontext is a pointer, so make a copy which is stored after the ctx */
946 memcpy (copied_mcontext, ctx->uc_mcontext, sizeof (*ctx->uc_mcontext));
947 copied_ctx->uc_mcontext = (void*)copied_mcontext;
950 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
951 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
952 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
953 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(copied_ctx);
954 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
955 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
960 mono_amd64_get_original_ip (void)
962 MonoLMF *lmf = mono_get_lmf ();
966 /* Reset the change to previous_lmf */
967 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
973 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
975 guint8 *code, *start;
977 gpointer throw_trampoline;
978 MonoJumpInfo *ji = NULL;
979 GSList *unwind_ops = NULL;
980 const guint kMaxCodeSize = NACL_SIZE (128, 256);
982 start = code = mono_global_codeman_reserve (kMaxCodeSize);
984 /* We are in the frame of a managed method after a call */
986 * We would like to throw the pending exception in such a way that it looks to
987 * be thrown from the managed method.
990 /* Save registers which might contain the return value of the call */
991 amd64_push_reg (code, AMD64_RAX);
992 amd64_push_reg (code, AMD64_RDX);
994 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
995 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
998 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1000 /* Obtain the pending exception */
1002 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
1003 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1005 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
1007 amd64_call_reg (code, AMD64_R11);
1009 /* Check if it is NULL, and branch */
1010 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
1011 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
1013 /* exc != NULL branch */
1015 /* Save the exc on the stack */
1016 amd64_push_reg (code, AMD64_RAX);
1018 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1020 /* Obtain the original ip and clear the flag in previous_lmf */
1022 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1023 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1025 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1027 amd64_call_reg (code, AMD64_R11);
1030 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
1032 /* Pop saved stuff from the stack */
1033 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
1035 /* Setup arguments for the throw trampoline */
1037 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
1038 /* The trampoline expects the caller ip to be pushed on the stack */
1039 amd64_push_reg (code, AMD64_RAX);
1041 /* Call the throw trampoline */
1043 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
1044 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1046 throw_trampoline = mono_get_throw_exception ();
1047 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1049 /* We use a jump instead of a call so we can push the original ip on the stack */
1050 amd64_jump_reg (code, AMD64_R11);
1052 /* ex == NULL branch */
1053 mono_amd64_patch (br [0], code);
1055 /* Obtain the original ip and clear the flag in previous_lmf */
1057 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1058 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1060 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1062 amd64_call_reg (code, AMD64_R11);
1063 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1065 /* Restore registers */
1066 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1067 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1068 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1069 amd64_pop_reg (code, AMD64_RDX);
1070 amd64_pop_reg (code, AMD64_RAX);
1072 /* Return to original code */
1073 amd64_jump_reg (code, AMD64_R11);
1075 g_assert ((code - start) < kMaxCodeSize);
1077 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1080 *info = mono_tramp_info_create ("throw_pending_exception", start, code - start, ji, unwind_ops);
1085 static gpointer throw_pending_exception;
1088 * Called when a thread receives an async exception while executing unmanaged code.
1089 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1090 * the return address on the stack to point to a helper routine which throws the
1094 mono_arch_notify_pending_exc (void)
1096 MonoLMF *lmf = mono_get_lmf ();
1099 /* Not yet started */
1106 if ((guint64)lmf->previous_lmf & 1)
1107 /* Already hijacked or trampoline LMF entry */
1110 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1111 lmf->rip = *(guint64*)(lmf->rsp - 8);
1112 /* Signal that lmf->rip is set */
1113 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1115 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1119 mono_amd64_get_exception_trampolines (gboolean aot)
1121 MonoTrampInfo *info;
1122 GSList *tramps = NULL;
1124 mono_arch_get_throw_pending_exception (&info, aot);
1125 tramps = g_slist_prepend (tramps, info);
1127 /* LLVM needs different throw trampolines */
1128 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1129 tramps = g_slist_prepend (tramps, info);
1131 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1132 tramps = g_slist_prepend (tramps, info);
1134 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1135 tramps = g_slist_prepend (tramps, info);
1141 mono_arch_exceptions_init (void)
1146 if (mono_aot_only) {
1147 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1148 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1149 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1150 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1151 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1152 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1153 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1155 /* Call this to avoid initialization races */
1156 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1158 tramps = mono_amd64_get_exception_trampolines (FALSE);
1159 for (l = tramps; l; l = l->next) {
1160 MonoTrampInfo *info = l->data;
1162 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1163 mono_save_trampoline_xdebug_info (info);
1164 mono_tramp_info_free (info);
1166 g_slist_free (tramps);
1173 * The mono_arch_unwindinfo* methods are used to build and add
1174 * function table info for each emitted method from mono. On Winx64
1175 * the seh handler will not be called if the mono methods are not
1176 * added to the function table.
1178 * We should not need to add non-volatile register info to the
1179 * table since mono stores that info elsewhere. (Except for the register
1183 #define MONO_MAX_UNWIND_CODES 22
1185 typedef union _UNWIND_CODE {
1188 guchar UnwindOp : 4;
1191 gushort FrameOffset;
1192 } UNWIND_CODE, *PUNWIND_CODE;
1194 typedef struct _UNWIND_INFO {
1197 guchar SizeOfProlog;
1198 guchar CountOfCodes;
1199 guchar FrameRegister : 4;
1200 guchar FrameOffset : 4;
1201 /* custom size for mono allowing for mono allowing for*/
1202 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1203 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1204 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1205 /*UWOP_PUSH_NONVOL offset = 15-0*/
1206 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1208 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1210 * OPTIONAL ULONG ExceptionHandler;
1211 * OPTIONAL ULONG FunctionEntry;
1213 * OPTIONAL ULONG ExceptionData[]; */
1214 } UNWIND_INFO, *PUNWIND_INFO;
1218 RUNTIME_FUNCTION runtimeFunction;
1219 UNWIND_INFO unwindInfo;
1220 } MonoUnwindInfo, *PMonoUnwindInfo;
1223 mono_arch_unwindinfo_create (gpointer* monoui)
1225 PMonoUnwindInfo newunwindinfo;
1226 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1227 newunwindinfo->unwindInfo.Version = 1;
1231 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1233 PMonoUnwindInfo unwindinfo;
1234 PUNWIND_CODE unwindcode;
1237 mono_arch_unwindinfo_create (monoui);
1239 unwindinfo = (MonoUnwindInfo*)*monoui;
1241 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1242 g_error ("Larger allocation needed for the unwind information.");
1244 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1245 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1246 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1247 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1248 unwindcode->OpInfo = reg;
1250 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1251 g_error ("Adding unwind info in wrong order.");
1253 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1257 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1259 PMonoUnwindInfo unwindinfo;
1260 PUNWIND_CODE unwindcode;
1263 mono_arch_unwindinfo_create (monoui);
1265 unwindinfo = (MonoUnwindInfo*)*monoui;
1267 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1268 g_error ("Larger allocation needed for the unwind information.");
1270 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1271 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1272 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1274 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1275 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1276 unwindcode->OpInfo = reg;
1278 unwindinfo->unwindInfo.FrameRegister = reg;
1280 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1281 g_error ("Adding unwind info in wrong order.");
1283 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1287 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1289 PMonoUnwindInfo unwindinfo;
1290 PUNWIND_CODE unwindcode;
1294 mono_arch_unwindinfo_create (monoui);
1296 unwindinfo = (MonoUnwindInfo*)*monoui;
1299 g_error ("Stack allocation must be equal to or greater than 0x8.");
1303 else if (size <= 0x7FFF8)
1308 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1309 g_error ("Larger allocation needed for the unwind information.");
1311 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1312 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1314 if (codesneeded == 1) {
1315 /*The size of the allocation is
1316 (the number in the OpInfo member) times 8 plus 8*/
1317 unwindcode->OpInfo = (size - 8)/8;
1318 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1321 if (codesneeded == 3) {
1322 /*the unscaled size of the allocation is recorded
1323 in the next two slots in little-endian format*/
1324 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1326 unwindcode->OpInfo = 1;
1329 /*the size of the allocation divided by 8
1330 is recorded in the next slot*/
1331 unwindcode->FrameOffset = size/8;
1333 unwindcode->OpInfo = 0;
1336 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1339 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1341 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1342 g_error ("Adding unwind info in wrong order.");
1344 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1348 mono_arch_unwindinfo_get_size (gpointer monoui)
1350 PMonoUnwindInfo unwindinfo;
1354 unwindinfo = (MonoUnwindInfo*)monoui;
1355 return (8 + sizeof (MonoUnwindInfo)) -
1356 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1360 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1364 PMonoUnwindInfo targetinfo;
1365 MonoDomain *domain = mono_domain_get ();
1367 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1371 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1373 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1375 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1377 return &targetinfo->runtimeFunction;
1381 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1383 PMonoUnwindInfo unwindinfo, targetinfo;
1385 guint64 targetlocation;
1389 unwindinfo = (MonoUnwindInfo*)*monoui;
1390 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1391 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1393 unwindinfo->runtimeFunction.EndAddress = code_size;
1394 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1396 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1398 codecount = unwindinfo->unwindInfo.CountOfCodes;
1400 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1401 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1404 g_free (unwindinfo);
1407 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1412 #if MONO_SUPPORT_TASKLETS
1413 MonoContinuationRestore
1414 mono_tasklets_arch_restore (void)
1416 static guint8* saved = NULL;
1417 guint8 *code, *start;
1418 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1419 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1423 return (MonoContinuationRestore)saved;
1424 code = start = mono_global_codeman_reserve (kMaxCodeSize);
1425 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1426 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1427 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1428 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1429 * We move cont to cont_reg since we need both rcx and rdi for the copy
1430 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1432 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1433 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1434 /* setup the copy of the stack */
1435 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1436 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1438 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1439 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1440 amd64_prefix (code, X86_REP_PREFIX);
1443 /* now restore the registers from the LMF */
1444 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1445 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1446 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1447 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1448 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1449 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1450 #if !defined(__native_client_codegen__)
1451 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1454 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1455 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1457 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1459 /* restore the lmf chain */
1460 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1461 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1463 /* state is already in rax */
1464 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1465 g_assert ((code - start) <= kMaxCodeSize);
1467 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1470 return (MonoContinuationRestore)saved;
1475 * mono_arch_setup_resume_sighandler_ctx:
1477 * Setup CTX so execution continues at FUNC.
1480 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1483 * When resuming from a signal handler, the stack should be misaligned, just like right after
1486 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1487 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1488 MONO_CONTEXT_SET_IP (ctx, func);