2 * exceptions-amd64.c: exception support for AMD64
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
14 #ifdef HAVE_UCONTEXT_H
18 #include <mono/arch/amd64/amd64-codegen.h>
19 #include <mono/metadata/appdomain.h>
20 #include <mono/metadata/tabledefs.h>
21 #include <mono/metadata/threads.h>
22 #include <mono/metadata/threads-types.h>
23 #include <mono/metadata/debug-helpers.h>
24 #include <mono/metadata/exception.h>
25 #include <mono/metadata/gc-internal.h>
26 #include <mono/metadata/mono-debug.h>
27 #include <mono/utils/mono-mmap.h>
30 #include "mini-amd64.h"
32 #include "debug-mini.h"
34 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
37 static MonoW32ExceptionHandler fpe_handler;
38 static MonoW32ExceptionHandler ill_handler;
39 static MonoW32ExceptionHandler segv_handler;
41 static LPTOP_LEVEL_EXCEPTION_FILTER old_handler;
43 #define W32_SEH_HANDLE_EX(_ex) \
44 if (_ex##_handler) _ex##_handler(0, er, sctx)
47 * Unhandled Exception Filter
48 * Top-level per-process exception handler.
50 LONG CALLBACK seh_handler(EXCEPTION_POINTERS* ep)
57 res = EXCEPTION_CONTINUE_EXECUTION;
59 er = ep->ExceptionRecord;
60 ctx = ep->ContextRecord;
61 sctx = g_malloc(sizeof(MonoContext));
63 /* Copy Win32 context to UNIX style context */
78 switch (er->ExceptionCode) {
79 case EXCEPTION_ACCESS_VIOLATION:
80 W32_SEH_HANDLE_EX(segv);
82 case EXCEPTION_ILLEGAL_INSTRUCTION:
83 W32_SEH_HANDLE_EX(ill);
85 case EXCEPTION_INT_DIVIDE_BY_ZERO:
86 case EXCEPTION_INT_OVERFLOW:
87 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
88 case EXCEPTION_FLT_OVERFLOW:
89 case EXCEPTION_FLT_UNDERFLOW:
90 case EXCEPTION_FLT_INEXACT_RESULT:
91 W32_SEH_HANDLE_EX(fpe);
97 /* Copy context back */
100 ctx->Rdi = sctx->rdi;
101 ctx->Rsi = sctx->rsi;
102 ctx->Rbx = sctx->rbx;
103 ctx->Rbp = sctx->rbp;
104 ctx->R12 = sctx->r12;
105 ctx->R13 = sctx->r13;
106 ctx->R14 = sctx->r14;
107 ctx->R15 = sctx->r15;
108 ctx->Rip = sctx->rip;
110 /* Volatile But should not matter?*/
111 ctx->Rax = sctx->rax;
112 ctx->Rcx = sctx->rcx;
113 ctx->Rdx = sctx->rdx;
120 void win32_seh_init()
122 old_handler = SetUnhandledExceptionFilter(seh_handler);
125 void win32_seh_cleanup()
127 if (old_handler) SetUnhandledExceptionFilter(old_handler);
130 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
134 fpe_handler = handler;
137 ill_handler = handler;
140 segv_handler = handler;
147 #endif /* TARGET_WIN32 */
150 * mono_arch_get_restore_context:
152 * Returns a pointer to a method which restores a previously saved sigcontext.
155 mono_arch_get_restore_context_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
157 guint8 *start = NULL;
160 /* restore_contect (MonoContext *ctx) */
164 start = code = mono_global_codeman_reserve (256);
166 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
168 /* Restore all registers except %rip and %r11 */
169 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rax), 8);
170 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rcx), 8);
171 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdx), 8);
172 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbx), 8);
173 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbp), 8);
174 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsi), 8);
175 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdi), 8);
176 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r8), 8);
177 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r9), 8);
178 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r10), 8);
179 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r12), 8);
180 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r13), 8);
181 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r14), 8);
182 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r15), 8);
184 if (mono_running_on_valgrind ()) {
185 /* Prevent 'Address 0x... is just below the stack ptr.' errors */
186 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
187 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
188 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
190 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
191 /* get return address */
192 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
195 /* jump to the saved IP */
196 amd64_jump_reg (code, AMD64_R11);
198 mono_arch_flush_icache (start, code - start);
200 *code_size = code - start;
206 * mono_arch_get_call_filter:
208 * Returns a pointer to a method which calls an exception filter. We
209 * also use this function to call finally handlers (we pass NULL as
210 * @exc object in this case).
213 mono_arch_get_call_filter_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
222 start = code = mono_global_codeman_reserve (128);
224 /* call_filter (MonoContext *ctx, unsigned long eip) */
227 /* Alloc new frame */
228 amd64_push_reg (code, AMD64_RBP);
229 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
231 /* Save callee saved regs */
233 for (i = 0; i < AMD64_NREG; ++i)
234 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
235 amd64_push_reg (code, i);
241 amd64_push_reg (code, AMD64_RBP);
243 /* Make stack misaligned, the call will make it aligned again */
245 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
248 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
249 /* load callee saved regs */
250 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
251 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
252 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
253 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
254 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
256 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
257 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
260 /* call the handler */
261 amd64_call_reg (code, AMD64_ARG_REG2);
264 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
267 amd64_pop_reg (code, AMD64_RBP);
269 /* Restore callee saved regs */
270 for (i = AMD64_NREG; i >= 0; --i)
271 if (AMD64_IS_CALLEE_SAVED_REG (i))
272 amd64_pop_reg (code, i);
277 g_assert ((code - start) < 128);
279 mono_arch_flush_icache (start, code - start);
281 *code_size = code - start;
287 * The first few arguments are dummy, to force the other arguments to be passed on
288 * the stack, this avoids overwriting the argument registers in the throw trampoline.
291 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
292 guint64 dummy5, guint64 dummy6,
293 MonoObject *exc, guint64 rip, guint64 rsp,
294 guint64 rbx, guint64 rbp, guint64 r12, guint64 r13,
295 guint64 r14, guint64 r15, guint64 rdi, guint64 rsi,
296 guint64 rax, guint64 rcx, guint64 rdx,
299 static void (*restore_context) (MonoContext *);
302 if (!restore_context)
303 restore_context = mono_get_restore_context ();
319 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
320 MonoException *mono_ex = (MonoException*)exc;
322 mono_ex->stack_trace = NULL;
325 if (mono_debug_using_mono_debugger ()) {
326 guint8 buf [16], *code;
328 mono_breakpoint_clean_code (NULL, (gpointer)rip, 8, buf, sizeof (buf));
331 if (buf [3] == 0xe8) {
332 MonoContext ctx_cp = ctx;
333 ctx_cp.rip = rip - 5;
335 if (mono_debugger_handle_exception (&ctx_cp, exc)) {
336 restore_context (&ctx_cp);
337 g_assert_not_reached ();
342 /* adjust eip so that it point into the call instruction */
345 mono_handle_exception (&ctx, exc, (gpointer)rip, FALSE);
346 restore_context (&ctx);
348 g_assert_not_reached ();
352 get_throw_trampoline (gboolean rethrow, guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
357 start = code = mono_global_codeman_reserve (64);
363 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, 8);
366 amd64_push_imm (code, rethrow);
367 amd64_push_reg (code, AMD64_RDX);
368 amd64_push_reg (code, AMD64_RCX);
369 amd64_push_reg (code, AMD64_RAX);
370 amd64_push_reg (code, AMD64_RSI);
371 amd64_push_reg (code, AMD64_RDI);
372 amd64_push_reg (code, AMD64_R15);
373 amd64_push_reg (code, AMD64_R14);
374 amd64_push_reg (code, AMD64_R13);
375 amd64_push_reg (code, AMD64_R12);
376 amd64_push_reg (code, AMD64_RBP);
377 amd64_push_reg (code, AMD64_RBX);
380 amd64_lea_membase (code, AMD64_RAX, AMD64_R11, 8);
381 amd64_push_reg (code, AMD64_RAX);
384 amd64_push_membase (code, AMD64_R11, 0);
387 amd64_push_reg (code, AMD64_ARG_REG1);
391 amd64_push_imm (code, 0);
392 amd64_push_imm (code, 0);
393 amd64_push_imm (code, 0);
394 amd64_push_imm (code, 0);
395 amd64_push_imm (code, 0);
396 amd64_push_imm (code, 0);
400 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
401 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
403 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_throw_exception);
405 amd64_call_reg (code, AMD64_R11);
406 amd64_breakpoint (code);
408 mono_arch_flush_icache (start, code - start);
410 g_assert ((code - start) < 64);
412 *code_size = code - start;
418 * mono_arch_get_throw_exception:
420 * Returns a function pointer which can be used to raise
421 * exceptions. The returned function has the following
422 * signature: void (*func) (MonoException *exc);
426 mono_arch_get_throw_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
428 return get_throw_trampoline (FALSE, code_size, ji, aot);
432 mono_arch_get_rethrow_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
434 return get_throw_trampoline (TRUE, code_size, ji, aot);
438 * mono_arch_get_throw_corlib_exception:
440 * Returns a function pointer which can be used to raise
441 * corlib exceptions. The returned function has the following
442 * signature: void (*func) (guint32 ex_token, guint32 offset);
443 * Here, offset is the offset which needs to be substracted from the caller IP
444 * to get the IP of the throw. Passing the offset has the advantage that it
445 * needs no relocations in the caller.
448 mono_arch_get_throw_corlib_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
450 static guint8* start;
454 start = code = mono_global_codeman_reserve (64);
459 amd64_push_reg (code, AMD64_ARG_REG2);
461 /* Call exception_from_token */
462 amd64_mov_reg_reg (code, AMD64_ARG_REG2, AMD64_ARG_REG1, 8);
464 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_IMAGE, mono_defaults.exception_class->image);
465 amd64_mov_reg_membase (code, AMD64_ARG_REG1, AMD64_RIP, 0, 8);
466 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_exception_from_token");
467 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
469 amd64_mov_reg_imm (code, AMD64_ARG_REG1, mono_defaults.exception_class->image);
470 amd64_mov_reg_imm (code, AMD64_R11, mono_exception_from_token);
473 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 32);
475 amd64_call_reg (code, AMD64_R11);
477 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 32);
480 /* Compute throw_ip */
481 amd64_pop_reg (code, AMD64_ARG_REG2);
483 amd64_pop_reg (code, AMD64_ARG_REG3);
484 amd64_alu_reg_reg (code, X86_SUB, AMD64_ARG_REG3, AMD64_ARG_REG2);
486 /* Put the throw_ip at the top of the misaligned stack */
487 amd64_push_reg (code, AMD64_ARG_REG3);
489 throw_ex = (guint64)mono_get_throw_exception ();
491 /* Call throw_exception */
492 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_RAX, 8);
494 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_throw_exception");
495 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
497 amd64_mov_reg_imm (code, AMD64_R11, throw_ex);
499 /* The original IP is on the stack */
500 amd64_jump_reg (code, AMD64_R11);
502 g_assert ((code - start) < 64);
504 mono_arch_flush_icache (start, code - start);
506 *code_size = code - start;
512 * mono_arch_find_jit_info_ext:
514 * This function is used to gather information from @ctx, and store it in @frame_info.
515 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
516 * is modified if needed.
517 * Returns TRUE on success, FALSE otherwise.
518 * This function is a version of mono_arch_find_jit_info () where all the results are
519 * returned in a StackFrameInfo structure.
522 mono_arch_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
523 MonoJitInfo *ji, MonoContext *ctx,
524 MonoContext *new_ctx, MonoLMF **lmf,
525 StackFrameInfo *frame)
527 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
529 memset (frame, 0, sizeof (StackFrameInfo));
531 frame->managed = FALSE;
536 gssize regs [MONO_MAX_IREGS + 1];
538 guint32 unwind_info_len;
541 frame->type = FRAME_TYPE_MANAGED;
543 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
544 frame->managed = TRUE;
547 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
549 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
551 regs [AMD64_RAX] = new_ctx->rax;
552 regs [AMD64_RBX] = new_ctx->rbx;
553 regs [AMD64_RCX] = new_ctx->rcx;
554 regs [AMD64_RDX] = new_ctx->rdx;
555 regs [AMD64_RBP] = new_ctx->rbp;
556 regs [AMD64_RSP] = new_ctx->rsp;
557 regs [AMD64_RSI] = new_ctx->rsi;
558 regs [AMD64_RDI] = new_ctx->rdi;
559 regs [AMD64_RIP] = new_ctx->rip;
560 regs [AMD64_R12] = new_ctx->r12;
561 regs [AMD64_R13] = new_ctx->r13;
562 regs [AMD64_R14] = new_ctx->r14;
563 regs [AMD64_R15] = new_ctx->r15;
565 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
566 (guint8*)ji->code_start + ji->code_size,
567 ip, regs, MONO_MAX_IREGS + 1, &cfa);
569 new_ctx->rax = regs [AMD64_RAX];
570 new_ctx->rbx = regs [AMD64_RBX];
571 new_ctx->rcx = regs [AMD64_RCX];
572 new_ctx->rdx = regs [AMD64_RDX];
573 new_ctx->rbp = regs [AMD64_RBP];
574 new_ctx->rsp = regs [AMD64_RSP];
575 new_ctx->rsi = regs [AMD64_RSI];
576 new_ctx->rdi = regs [AMD64_RDI];
577 new_ctx->rip = regs [AMD64_RIP];
578 new_ctx->r12 = regs [AMD64_R12];
579 new_ctx->r13 = regs [AMD64_R13];
580 new_ctx->r14 = regs [AMD64_R14];
581 new_ctx->r15 = regs [AMD64_R15];
583 /* The CFA becomes the new SP value */
584 new_ctx->rsp = (gssize)cfa;
589 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
590 /* remove any unused lmf */
591 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
594 #ifndef MONO_AMD64_NO_PUSHES
595 /* Pop arguments off the stack */
597 MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
599 guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (ji->method), mono_method_signature (ji->method)->param_count, arg_info);
600 new_ctx->rsp += stack_to_pop;
608 if (((guint64)(*lmf)->previous_lmf) & 2) {
610 * This LMF entry is created by the soft debug code to mark transitions to
611 * managed code done during invokes.
613 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
615 g_assert (ext->debugger_invoke);
617 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
619 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
621 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
626 if (((guint64)(*lmf)->previous_lmf) & 1) {
627 /* This LMF has the rip field set */
629 } else if ((*lmf)->rsp == 0) {
634 * The rsp field is set just before the call which transitioned to native
635 * code. Obtain the rip from the stack.
637 rip = *(guint64*)((*lmf)->rsp - sizeof (gpointer));
640 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
642 // FIXME: This can happen with multiple appdomains (bug #444383)
647 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
650 new_ctx->rbp = (*lmf)->rbp;
651 new_ctx->rsp = (*lmf)->rsp;
653 new_ctx->rbx = (*lmf)->rbx;
654 new_ctx->r12 = (*lmf)->r12;
655 new_ctx->r13 = (*lmf)->r13;
656 new_ctx->r14 = (*lmf)->r14;
657 new_ctx->r15 = (*lmf)->r15;
659 new_ctx->rdi = (*lmf)->rdi;
660 new_ctx->rsi = (*lmf)->rsi;
663 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
672 * mono_arch_handle_exception:
674 * @ctx: saved processor state
675 * @obj: the exception object
678 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
682 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
684 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
687 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
689 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
694 #ifdef MONO_ARCH_USE_SIGACTION
695 static inline guint64*
696 gregs_from_ucontext (ucontext_t *ctx)
698 return (guint64 *) UCONTEXT_GREGS (ctx);
702 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
704 #ifdef MONO_ARCH_USE_SIGACTION
705 ucontext_t *ctx = (ucontext_t*)sigctx;
707 guint64 *gregs = gregs_from_ucontext (ctx);
709 mctx->rax = gregs [REG_RAX];
710 mctx->rbx = gregs [REG_RBX];
711 mctx->rcx = gregs [REG_RCX];
712 mctx->rdx = gregs [REG_RDX];
713 mctx->rbp = gregs [REG_RBP];
714 mctx->rsp = gregs [REG_RSP];
715 mctx->rsi = gregs [REG_RSI];
716 mctx->rdi = gregs [REG_RDI];
717 mctx->rip = gregs [REG_RIP];
718 mctx->r12 = gregs [REG_R12];
719 mctx->r13 = gregs [REG_R13];
720 mctx->r14 = gregs [REG_R14];
721 mctx->r15 = gregs [REG_R15];
723 MonoContext *ctx = (MonoContext *)sigctx;
725 mctx->rax = ctx->rax;
726 mctx->rbx = ctx->rbx;
727 mctx->rcx = ctx->rcx;
728 mctx->rdx = ctx->rdx;
729 mctx->rbp = ctx->rbp;
730 mctx->rsp = ctx->rsp;
731 mctx->rsi = ctx->rsi;
732 mctx->rdi = ctx->rdi;
733 mctx->rip = ctx->rip;
734 mctx->r12 = ctx->r12;
735 mctx->r13 = ctx->r13;
736 mctx->r14 = ctx->r14;
737 mctx->r15 = ctx->r15;
742 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
744 #ifdef MONO_ARCH_USE_SIGACTION
745 ucontext_t *ctx = (ucontext_t*)sigctx;
747 guint64 *gregs = gregs_from_ucontext (ctx);
749 gregs [REG_RAX] = mctx->rax;
750 gregs [REG_RBX] = mctx->rbx;
751 gregs [REG_RCX] = mctx->rcx;
752 gregs [REG_RDX] = mctx->rdx;
753 gregs [REG_RBP] = mctx->rbp;
754 gregs [REG_RSP] = mctx->rsp;
755 gregs [REG_RSI] = mctx->rsi;
756 gregs [REG_RDI] = mctx->rdi;
757 gregs [REG_RIP] = mctx->rip;
758 gregs [REG_R12] = mctx->r12;
759 gregs [REG_R13] = mctx->r13;
760 gregs [REG_R14] = mctx->r14;
761 gregs [REG_R15] = mctx->r15;
763 MonoContext *ctx = (MonoContext *)sigctx;
765 ctx->rax = mctx->rax;
766 ctx->rbx = mctx->rbx;
767 ctx->rcx = mctx->rcx;
768 ctx->rdx = mctx->rdx;
769 ctx->rbp = mctx->rbp;
770 ctx->rsp = mctx->rsp;
771 ctx->rsi = mctx->rsi;
772 ctx->rdi = mctx->rdi;
773 ctx->rip = mctx->rip;
774 ctx->r12 = mctx->r12;
775 ctx->r13 = mctx->r13;
776 ctx->r14 = mctx->r14;
777 ctx->r15 = mctx->r15;
782 mono_arch_ip_from_context (void *sigctx)
785 #ifdef MONO_ARCH_USE_SIGACTION
787 ucontext_t *ctx = (ucontext_t*)sigctx;
789 guint64 *gregs = gregs_from_ucontext (ctx);
791 return (gpointer)gregs [REG_RIP];
793 MonoContext *ctx = sigctx;
794 return (gpointer)ctx->rip;
799 restore_soft_guard_pages (void)
801 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
802 if (jit_tls->stack_ovf_guard_base)
803 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
807 * this function modifies mctx so that when it is restored, it
808 * won't execcute starting at mctx.eip, but in a function that
809 * will restore the protection on the soft-guard pages and return back to
810 * continue at mctx.eip.
813 prepare_for_guard_pages (MonoContext *mctx)
816 sp = (gpointer)(mctx->rsp);
818 /* the return addr */
819 sp [0] = (gpointer)(mctx->rip);
820 mctx->rip = (guint64)restore_soft_guard_pages;
821 mctx->rsp = (guint64)sp;
825 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
827 void (*restore_context) (MonoContext *);
830 restore_context = mono_get_restore_context ();
831 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
833 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
835 prepare_for_guard_pages (&mctx);
836 restore_context (&mctx);
839 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
841 prepare_for_guard_pages (&mctx);
842 restore_context (&mctx);
846 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
848 #ifdef MONO_ARCH_USE_SIGACTION
849 MonoException *exc = NULL;
850 ucontext_t *ctx = (ucontext_t*)sigctx;
851 guint64 *gregs = gregs_from_ucontext (ctx);
852 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)gregs [REG_RIP], NULL);
857 exc = mono_domain_get ()->stack_overflow_ex;
859 mono_handle_native_sigsegv (SIGSEGV, sigctx);
861 /* setup a call frame on the real stack so that control is returned there
862 * and exception handling can continue.
863 * The frame looks like:
867 * 128 is the size of the red zone
869 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
872 sp = (gpointer)(gregs [REG_RSP] & ~15);
873 sp = (gpointer)((char*)sp - frame_size);
874 /* the arguments must be aligned */
875 sp [-1] = (gpointer)gregs [REG_RIP];
876 /* may need to adjust pointers in the new struct copy, depending on the OS */
877 memcpy (sp + 4, ctx, sizeof (ucontext_t));
878 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
879 gregs [REG_RIP] = (unsigned long)altstack_handle_and_restore;
880 gregs [REG_RSP] = (unsigned long)(sp - 1);
881 gregs [REG_RDI] = (unsigned long)(sp + 4);
882 gregs [REG_RSI] = (guint64)exc;
883 gregs [REG_RDX] = stack_ovf;
888 mono_amd64_get_original_ip (void)
890 MonoLMF *lmf = mono_get_lmf ();
894 /* Reset the change to previous_lmf */
895 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
901 mono_arch_get_throw_pending_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
903 guint8 *code, *start;
905 gpointer throw_trampoline;
909 start = code = mono_global_codeman_reserve (128);
911 /* We are in the frame of a managed method after a call */
913 * We would like to throw the pending exception in such a way that it looks to
914 * be thrown from the managed method.
917 /* Save registers which might contain the return value of the call */
918 amd64_push_reg (code, AMD64_RAX);
919 amd64_push_reg (code, AMD64_RDX);
921 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
922 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
925 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
927 /* Obtain the pending exception */
929 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
930 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
932 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
934 amd64_call_reg (code, AMD64_R11);
936 /* Check if it is NULL, and branch */
937 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
938 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
940 /* exc != NULL branch */
942 /* Save the exc on the stack */
943 amd64_push_reg (code, AMD64_RAX);
945 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
947 /* Obtain the original ip and clear the flag in previous_lmf */
949 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
950 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
952 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
954 amd64_call_reg (code, AMD64_R11);
957 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
959 /* Pop saved stuff from the stack */
960 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
962 /* Setup arguments for the throw trampoline */
964 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
965 /* The trampoline expects the caller ip to be pushed on the stack */
966 amd64_push_reg (code, AMD64_RAX);
968 /* Call the throw trampoline */
970 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
971 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
973 throw_trampoline = mono_get_throw_exception ();
974 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
976 /* We use a jump instead of a call so we can push the original ip on the stack */
977 amd64_jump_reg (code, AMD64_R11);
979 /* ex == NULL branch */
980 mono_amd64_patch (br [0], code);
982 /* Obtain the original ip and clear the flag in previous_lmf */
984 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
985 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
987 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
989 amd64_call_reg (code, AMD64_R11);
990 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
992 /* Restore registers */
993 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
994 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
995 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
996 amd64_pop_reg (code, AMD64_RDX);
997 amd64_pop_reg (code, AMD64_RAX);
999 /* Return to original code */
1000 amd64_jump_reg (code, AMD64_R11);
1002 g_assert ((code - start) < 128);
1004 *code_size = code - start;
1009 static gpointer throw_pending_exception;
1012 * Called when a thread receives an async exception while executing unmanaged code.
1013 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1014 * the return address on the stack to point to a helper routine which throws the
1018 mono_arch_notify_pending_exc (void)
1020 MonoLMF *lmf = mono_get_lmf ();
1026 if ((guint64)lmf->previous_lmf & 1)
1027 /* Already hijacked or trampoline LMF entry */
1030 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1031 lmf->rip = *(guint64*)(lmf->rsp - 8);
1032 /* Signal that lmf->rip is set */
1033 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1035 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1039 mono_arch_exceptions_init (void)
1044 if (mono_aot_only) {
1045 throw_pending_exception = mono_aot_get_named_code ("throw_pending_exception");
1047 /* Call this to avoid initialization races */
1048 throw_pending_exception = mono_arch_get_throw_pending_exception_full (&code_size, &ji, FALSE);
1055 * The mono_arch_unwindinfo* methods are used to build and add
1056 * function table info for each emitted method from mono. On Winx64
1057 * the seh handler will not be called if the mono methods are not
1058 * added to the function table.
1060 * We should not need to add non-volatile register info to the
1061 * table since mono stores that info elsewhere. (Except for the register
1065 #define MONO_MAX_UNWIND_CODES 22
1067 typedef union _UNWIND_CODE {
1070 guchar UnwindOp : 4;
1073 gushort FrameOffset;
1074 } UNWIND_CODE, *PUNWIND_CODE;
1076 typedef struct _UNWIND_INFO {
1079 guchar SizeOfProlog;
1080 guchar CountOfCodes;
1081 guchar FrameRegister : 4;
1082 guchar FrameOffset : 4;
1083 /* custom size for mono allowing for mono allowing for*/
1084 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1085 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1086 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1087 /*UWOP_PUSH_NONVOL offset = 15-0*/
1088 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1090 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1092 * OPTIONAL ULONG ExceptionHandler;
1093 * OPTIONAL ULONG FunctionEntry;
1095 * OPTIONAL ULONG ExceptionData[]; */
1096 } UNWIND_INFO, *PUNWIND_INFO;
1100 RUNTIME_FUNCTION runtimeFunction;
1101 UNWIND_INFO unwindInfo;
1102 } MonoUnwindInfo, *PMonoUnwindInfo;
1105 mono_arch_unwindinfo_create (gpointer* monoui)
1107 PMonoUnwindInfo newunwindinfo;
1108 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1109 newunwindinfo->unwindInfo.Version = 1;
1113 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1115 PMonoUnwindInfo unwindinfo;
1116 PUNWIND_CODE unwindcode;
1119 mono_arch_unwindinfo_create (monoui);
1121 unwindinfo = (MonoUnwindInfo*)*monoui;
1123 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1124 g_error ("Larger allocation needed for the unwind information.");
1126 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1127 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1128 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1129 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1130 unwindcode->OpInfo = reg;
1132 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1133 g_error ("Adding unwind info in wrong order.");
1135 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1139 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1141 PMonoUnwindInfo unwindinfo;
1142 PUNWIND_CODE unwindcode;
1145 mono_arch_unwindinfo_create (monoui);
1147 unwindinfo = (MonoUnwindInfo*)*monoui;
1149 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1150 g_error ("Larger allocation needed for the unwind information.");
1152 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1153 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1154 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1156 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1157 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1158 unwindcode->OpInfo = reg;
1160 unwindinfo->unwindInfo.FrameRegister = reg;
1162 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1163 g_error ("Adding unwind info in wrong order.");
1165 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1169 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1171 PMonoUnwindInfo unwindinfo;
1172 PUNWIND_CODE unwindcode;
1176 mono_arch_unwindinfo_create (monoui);
1178 unwindinfo = (MonoUnwindInfo*)*monoui;
1181 g_error ("Stack allocation must be equal to or greater than 0x8.");
1185 else if (size <= 0x7FFF8)
1190 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1191 g_error ("Larger allocation needed for the unwind information.");
1193 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1194 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1196 if (codesneeded == 1) {
1197 /*The size of the allocation is
1198 (the number in the OpInfo member) times 8 plus 8*/
1199 unwindcode->OpInfo = (size - 8)/8;
1200 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1203 if (codesneeded == 3) {
1204 /*the unscaled size of the allocation is recorded
1205 in the next two slots in little-endian format*/
1206 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1208 unwindcode->OpInfo = 1;
1211 /*the size of the allocation divided by 8
1212 is recorded in the next slot*/
1213 unwindcode->FrameOffset = size/8;
1215 unwindcode->OpInfo = 0;
1218 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1221 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1223 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1224 g_error ("Adding unwind info in wrong order.");
1226 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1230 mono_arch_unwindinfo_get_size (gpointer monoui)
1232 PMonoUnwindInfo unwindinfo;
1236 unwindinfo = (MonoUnwindInfo*)monoui;
1237 return (8 + sizeof (MonoUnwindInfo)) -
1238 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1242 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1246 PMonoUnwindInfo targetinfo;
1247 MonoDomain *domain = mono_domain_get ();
1249 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1253 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1255 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1257 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1259 return &targetinfo->runtimeFunction;
1263 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1265 PMonoUnwindInfo unwindinfo, targetinfo;
1267 guint64 targetlocation;
1271 unwindinfo = (MonoUnwindInfo*)*monoui;
1272 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1273 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1275 unwindinfo->runtimeFunction.EndAddress = code_size;
1276 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1278 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1280 codecount = unwindinfo->unwindInfo.CountOfCodes;
1282 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1283 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1286 g_free (unwindinfo);
1289 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1294 #if MONO_SUPPORT_TASKLETS
1295 MonoContinuationRestore
1296 mono_tasklets_arch_restore (void)
1298 static guint8* saved = NULL;
1299 guint8 *code, *start;
1300 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1303 return (MonoContinuationRestore)saved;
1304 code = start = mono_global_codeman_reserve (64);
1305 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1306 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1307 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1308 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1309 * We move cont to cont_reg since we need both rcx and rdi for the copy
1310 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1312 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1313 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1314 /* setup the copy of the stack */
1315 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1316 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1318 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1319 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1320 amd64_prefix (code, X86_REP_PREFIX);
1323 /* now restore the registers from the LMF */
1324 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1325 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1326 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1327 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1328 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1329 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1330 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1332 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1333 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1335 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1337 /* restore the lmf chain */
1338 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1339 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1341 /* state is already in rax */
1342 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1343 g_assert ((code - start) <= 64);
1345 return (MonoContinuationRestore)saved;