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((int)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 /* PLATFORM_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);
255 #ifdef PLATFORM_WIN32
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);
389 #ifdef PLATFORM_WIN32
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_exception_by_name_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
443 start = code = mono_global_codeman_reserve (64);
447 /* Not used on amd64 */
448 amd64_breakpoint (code);
450 mono_arch_flush_icache (start, code - start);
452 *code_size = code - start;
458 * mono_arch_get_throw_corlib_exception:
460 * Returns a function pointer which can be used to raise
461 * corlib exceptions. The returned function has the following
462 * signature: void (*func) (guint32 ex_token, guint32 offset);
463 * Here, offset is the offset which needs to be substracted from the caller IP
464 * to get the IP of the throw. Passing the offset has the advantage that it
465 * needs no relocations in the caller.
468 mono_arch_get_throw_corlib_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
470 static guint8* start;
474 start = code = mono_global_codeman_reserve (64);
479 amd64_push_reg (code, AMD64_ARG_REG2);
481 /* Call exception_from_token */
482 amd64_mov_reg_reg (code, AMD64_ARG_REG2, AMD64_ARG_REG1, 8);
484 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_IMAGE, mono_defaults.exception_class->image);
485 amd64_mov_reg_membase (code, AMD64_ARG_REG1, AMD64_RIP, 0, 8);
486 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_exception_from_token");
487 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
489 amd64_mov_reg_imm (code, AMD64_ARG_REG1, mono_defaults.exception_class->image);
490 amd64_mov_reg_imm (code, AMD64_R11, mono_exception_from_token);
492 #ifdef PLATFORM_WIN32
493 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 32);
495 amd64_call_reg (code, AMD64_R11);
496 #ifdef PLATFORM_WIN32
497 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 32);
500 /* Compute throw_ip */
501 amd64_pop_reg (code, AMD64_ARG_REG2);
503 amd64_pop_reg (code, AMD64_ARG_REG3);
504 amd64_alu_reg_reg (code, X86_SUB, AMD64_ARG_REG3, AMD64_ARG_REG2);
506 /* Put the throw_ip at the top of the misaligned stack */
507 amd64_push_reg (code, AMD64_ARG_REG3);
509 throw_ex = (guint64)mono_get_throw_exception ();
511 /* Call throw_exception */
512 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_RAX, 8);
514 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_throw_exception");
515 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
517 amd64_mov_reg_imm (code, AMD64_R11, throw_ex);
519 /* The original IP is on the stack */
520 amd64_jump_reg (code, AMD64_R11);
522 g_assert ((code - start) < 64);
524 mono_arch_flush_icache (start, code - start);
526 *code_size = code - start;
531 /* mono_arch_find_jit_info:
533 * This function is used to gather information from @ctx. It return the
534 * MonoJitInfo of the corresponding function, unwinds one stack frame and
535 * stores the resulting context into @new_ctx. It also stores a string
536 * describing the stack location into @trace (if not NULL), and modifies
537 * the @lmf if necessary. @native_offset return the IP offset from the
538 * start of the function or -1 if that info is not available.
541 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
542 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
545 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
547 /* Avoid costly table lookup during stack overflow */
548 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
551 ji = mono_jit_info_table_find (domain, ip);
559 gssize regs [MONO_MAX_IREGS + 1];
561 guint32 unwind_info_len;
565 if (!ji->method->wrapper_type)
569 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
571 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
573 regs [AMD64_RAX] = new_ctx->rax;
574 regs [AMD64_RBX] = new_ctx->rbx;
575 regs [AMD64_RCX] = new_ctx->rcx;
576 regs [AMD64_RDX] = new_ctx->rdx;
577 regs [AMD64_RBP] = new_ctx->rbp;
578 regs [AMD64_RSP] = new_ctx->rsp;
579 regs [AMD64_RSI] = new_ctx->rsi;
580 regs [AMD64_RDI] = new_ctx->rdi;
581 regs [AMD64_RIP] = new_ctx->rip;
582 regs [AMD64_R12] = new_ctx->r12;
583 regs [AMD64_R13] = new_ctx->r13;
584 regs [AMD64_R14] = new_ctx->r14;
585 regs [AMD64_R15] = new_ctx->r15;
587 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
588 (guint8*)ji->code_start + ji->code_size,
589 ip, regs, MONO_MAX_IREGS + 1, &cfa);
591 new_ctx->rax = regs [AMD64_RAX];
592 new_ctx->rbx = regs [AMD64_RBX];
593 new_ctx->rcx = regs [AMD64_RCX];
594 new_ctx->rdx = regs [AMD64_RDX];
595 new_ctx->rbp = regs [AMD64_RBP];
596 new_ctx->rsp = regs [AMD64_RSP];
597 new_ctx->rsi = regs [AMD64_RSI];
598 new_ctx->rdi = regs [AMD64_RDI];
599 new_ctx->rip = regs [AMD64_RIP];
600 new_ctx->r12 = regs [AMD64_R12];
601 new_ctx->r13 = regs [AMD64_R13];
602 new_ctx->r14 = regs [AMD64_R14];
603 new_ctx->r15 = regs [AMD64_R15];
605 /* The CFA becomes the new SP value */
606 new_ctx->rsp = (gssize)cfa;
611 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
612 /* remove any unused lmf */
613 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~1);
616 #ifndef MONO_AMD64_NO_PUSHES
617 /* Pop arguments off the stack */
619 MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
621 guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (ji->method), mono_method_signature (ji->method)->param_count, arg_info);
622 new_ctx->rsp += stack_to_pop;
630 if (((guint64)(*lmf)->previous_lmf) & 1) {
631 /* This LMF has the rip field set */
633 } else if ((*lmf)->rsp == 0) {
638 * The rsp field is set just before the call which transitioned to native
639 * code. Obtain the rip from the stack.
641 rip = *(guint64*)((*lmf)->rsp - sizeof (gpointer));
644 ji = mono_jit_info_table_find (domain, (gpointer)rip);
646 // FIXME: This can happen with multiple appdomains (bug #444383)
651 new_ctx->rbp = (*lmf)->rbp;
652 new_ctx->rsp = (*lmf)->rsp;
654 new_ctx->rbx = (*lmf)->rbx;
655 new_ctx->r12 = (*lmf)->r12;
656 new_ctx->r13 = (*lmf)->r13;
657 new_ctx->r14 = (*lmf)->r14;
658 new_ctx->r15 = (*lmf)->r15;
659 #ifdef PLATFORM_WIN32
660 new_ctx->rdi = (*lmf)->rdi;
661 new_ctx->rsi = (*lmf)->rsi;
664 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~1);
666 return ji ? ji : res;
673 * mono_arch_handle_exception:
675 * @ctx: saved processor state
676 * @obj: the exception object
679 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
683 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
685 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
688 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
690 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
695 #ifdef MONO_ARCH_USE_SIGACTION
696 static inline guint64*
697 gregs_from_ucontext (ucontext_t *ctx)
699 return (guint64 *) UCONTEXT_GREGS (ctx);
703 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
705 #ifdef MONO_ARCH_USE_SIGACTION
706 ucontext_t *ctx = (ucontext_t*)sigctx;
708 guint64 *gregs = gregs_from_ucontext (ctx);
710 mctx->rax = gregs [REG_RAX];
711 mctx->rbx = gregs [REG_RBX];
712 mctx->rcx = gregs [REG_RCX];
713 mctx->rdx = gregs [REG_RDX];
714 mctx->rbp = gregs [REG_RBP];
715 mctx->rsp = gregs [REG_RSP];
716 mctx->rsi = gregs [REG_RSI];
717 mctx->rdi = gregs [REG_RDI];
718 mctx->rip = gregs [REG_RIP];
719 mctx->r12 = gregs [REG_R12];
720 mctx->r13 = gregs [REG_R13];
721 mctx->r14 = gregs [REG_R14];
722 mctx->r15 = gregs [REG_R15];
724 MonoContext *ctx = (MonoContext *)sigctx;
726 mctx->rax = ctx->rax;
727 mctx->rbx = ctx->rbx;
728 mctx->rcx = ctx->rcx;
729 mctx->rdx = ctx->rdx;
730 mctx->rbp = ctx->rbp;
731 mctx->rsp = ctx->rsp;
732 mctx->rsi = ctx->rsi;
733 mctx->rdi = ctx->rdi;
734 mctx->rip = ctx->rip;
735 mctx->r12 = ctx->r12;
736 mctx->r13 = ctx->r13;
737 mctx->r14 = ctx->r14;
738 mctx->r15 = ctx->r15;
743 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
745 #ifdef MONO_ARCH_USE_SIGACTION
746 ucontext_t *ctx = (ucontext_t*)sigctx;
748 guint64 *gregs = gregs_from_ucontext (ctx);
750 gregs [REG_RAX] = mctx->rax;
751 gregs [REG_RBX] = mctx->rbx;
752 gregs [REG_RCX] = mctx->rcx;
753 gregs [REG_RDX] = mctx->rdx;
754 gregs [REG_RBP] = mctx->rbp;
755 gregs [REG_RSP] = mctx->rsp;
756 gregs [REG_RSI] = mctx->rsi;
757 gregs [REG_RDI] = mctx->rdi;
758 gregs [REG_RIP] = mctx->rip;
759 gregs [REG_R12] = mctx->r12;
760 gregs [REG_R13] = mctx->r13;
761 gregs [REG_R14] = mctx->r14;
762 gregs [REG_R15] = mctx->r15;
764 MonoContext *ctx = (MonoContext *)sigctx;
766 ctx->rax = mctx->rax;
767 ctx->rbx = mctx->rbx;
768 ctx->rcx = mctx->rcx;
769 ctx->rdx = mctx->rdx;
770 ctx->rbp = mctx->rbp;
771 ctx->rsp = mctx->rsp;
772 ctx->rsi = mctx->rsi;
773 ctx->rdi = mctx->rdi;
774 ctx->rip = mctx->rip;
775 ctx->r12 = mctx->r12;
776 ctx->r13 = mctx->r13;
777 ctx->r14 = mctx->r14;
778 ctx->r15 = mctx->r15;
783 mono_arch_ip_from_context (void *sigctx)
786 #ifdef MONO_ARCH_USE_SIGACTION
788 ucontext_t *ctx = (ucontext_t*)sigctx;
790 guint64 *gregs = gregs_from_ucontext (ctx);
792 return (gpointer)gregs [REG_RIP];
794 MonoContext *ctx = sigctx;
795 return (gpointer)ctx->rip;
800 restore_soft_guard_pages (void)
802 MonoJitTlsData *jit_tls = TlsGetValue (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 (void *sigctx, gpointer obj, gboolean stack_ovf)
828 void (*restore_context) (MonoContext *);
831 restore_context = mono_get_restore_context ();
832 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
834 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
836 prepare_for_guard_pages (&mctx);
837 restore_context (&mctx);
840 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
842 prepare_for_guard_pages (&mctx);
843 restore_context (&mctx);
847 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
849 #ifdef MONO_ARCH_USE_SIGACTION
850 MonoException *exc = NULL;
851 ucontext_t *ctx = (ucontext_t*)sigctx;
852 guint64 *gregs = gregs_from_ucontext (ctx);
853 MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), (gpointer)gregs [REG_RIP]);
858 exc = mono_domain_get ()->stack_overflow_ex;
860 mono_handle_native_sigsegv (SIGSEGV, sigctx);
862 /* setup a call frame on the real stack so that control is returned there
863 * and exception handling can continue.
864 * The frame looks like:
868 * 128 is the size of the red zone
870 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
873 sp = (gpointer)(gregs [REG_RSP] & ~15);
874 sp = (gpointer)((char*)sp - frame_size);
875 /* the arguments must be aligned */
876 sp [-1] = (gpointer)gregs [REG_RIP];
877 /* may need to adjust pointers in the new struct copy, depending on the OS */
878 memcpy (sp + 4, ctx, sizeof (ucontext_t));
879 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
880 gregs [REG_RIP] = (unsigned long)altstack_handle_and_restore;
881 gregs [REG_RSP] = (unsigned long)(sp - 1);
882 gregs [REG_RDI] = (unsigned long)(sp + 4);
883 gregs [REG_RSI] = (guint64)exc;
884 gregs [REG_RDX] = stack_ovf;
889 mono_amd64_get_original_ip (void)
891 MonoLMF *lmf = mono_get_lmf ();
895 /* Reset the change to previous_lmf */
896 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
902 mono_arch_get_throw_pending_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
904 guint8 *code, *start;
906 gpointer throw_trampoline;
910 start = code = mono_global_codeman_reserve (128);
912 /* We are in the frame of a managed method after a call */
914 * We would like to throw the pending exception in such a way that it looks to
915 * be thrown from the managed method.
918 /* Save registers which might contain the return value of the call */
919 amd64_push_reg (code, AMD64_RAX);
920 amd64_push_reg (code, AMD64_RDX);
922 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
923 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
926 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
928 /* Obtain the pending exception */
930 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
931 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
933 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
935 amd64_call_reg (code, AMD64_R11);
937 /* Check if it is NULL, and branch */
938 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
939 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
941 /* exc != NULL branch */
943 /* Save the exc on the stack */
944 amd64_push_reg (code, AMD64_RAX);
946 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
948 /* Obtain the original ip and clear the flag in previous_lmf */
950 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
951 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
953 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
955 amd64_call_reg (code, AMD64_R11);
958 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
960 /* Pop saved stuff from the stack */
961 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
963 /* Setup arguments for the throw trampoline */
965 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
966 /* The trampoline expects the caller ip to be pushed on the stack */
967 amd64_push_reg (code, AMD64_RAX);
969 /* Call the throw trampoline */
971 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
972 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
974 throw_trampoline = mono_get_throw_exception ();
975 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
977 /* We use a jump instead of a call so we can push the original ip on the stack */
978 amd64_jump_reg (code, AMD64_R11);
980 /* ex == NULL branch */
981 mono_amd64_patch (br [0], code);
983 /* Obtain the original ip and clear the flag in previous_lmf */
985 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
986 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
988 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
990 amd64_call_reg (code, AMD64_R11);
991 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
993 /* Restore registers */
994 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
995 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
996 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
997 amd64_pop_reg (code, AMD64_RDX);
998 amd64_pop_reg (code, AMD64_RAX);
1000 /* Return to original code */
1001 amd64_jump_reg (code, AMD64_R11);
1003 g_assert ((code - start) < 128);
1005 *code_size = code - start;
1010 static gpointer throw_pending_exception;
1013 * Called when a thread receives an async exception while executing unmanaged code.
1014 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1015 * the return address on the stack to point to a helper routine which throws the
1019 mono_arch_notify_pending_exc (void)
1021 MonoLMF *lmf = mono_get_lmf ();
1027 if ((guint64)lmf->previous_lmf & 1)
1028 /* Already hijacked or trampoline LMF entry */
1031 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1032 lmf->rip = *(guint64*)(lmf->rsp - 8);
1033 /* Signal that lmf->rip is set */
1034 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1036 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1040 mono_arch_exceptions_init (void)
1045 if (mono_aot_only) {
1046 throw_pending_exception = mono_aot_get_named_code ("throw_pending_exception");
1048 /* Call this to avoid initialization races */
1049 throw_pending_exception = mono_arch_get_throw_pending_exception_full (&code_size, &ji, FALSE);
1053 #ifdef PLATFORM_WIN32
1056 * The mono_arch_unwindinfo* methods are used to build and add
1057 * function table info for each emitted method from mono. On Winx64
1058 * the seh handler will not be called if the mono methods are not
1059 * added to the function table.
1061 * We should not need to add non-volatile register info to the
1062 * table since mono stores that info elsewhere. (Except for the register
1066 #define MONO_MAX_UNWIND_CODES 22
1068 typedef union _UNWIND_CODE {
1071 guchar UnwindOp : 4;
1074 gushort FrameOffset;
1075 } UNWIND_CODE, *PUNWIND_CODE;
1077 typedef struct _UNWIND_INFO {
1080 guchar SizeOfProlog;
1081 guchar CountOfCodes;
1082 guchar FrameRegister : 4;
1083 guchar FrameOffset : 4;
1084 /* custom size for mono allowing for mono allowing for*/
1085 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1086 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1087 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1088 /*UWOP_PUSH_NONVOL offset = 15-0*/
1089 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1091 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1093 * OPTIONAL ULONG ExceptionHandler;
1094 * OPTIONAL ULONG FunctionEntry;
1096 * OPTIONAL ULONG ExceptionData[]; */
1097 } UNWIND_INFO, *PUNWIND_INFO;
1101 RUNTIME_FUNCTION runtimeFunction;
1102 UNWIND_INFO unwindInfo;
1103 } MonoUnwindInfo, *PMonoUnwindInfo;
1106 mono_arch_unwindinfo_create (gpointer* monoui)
1108 PMonoUnwindInfo newunwindinfo;
1109 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1110 newunwindinfo->unwindInfo.Version = 1;
1114 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1116 PMonoUnwindInfo unwindinfo;
1117 PUNWIND_CODE unwindcode;
1120 mono_arch_unwindinfo_create (monoui);
1122 unwindinfo = (MonoUnwindInfo*)*monoui;
1124 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1125 g_error ("Larger allocation needed for the unwind information.");
1127 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1128 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1129 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1130 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1131 unwindcode->OpInfo = reg;
1133 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1134 g_error ("Adding unwind info in wrong order.");
1136 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1140 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1142 PMonoUnwindInfo unwindinfo;
1143 PUNWIND_CODE unwindcode;
1146 mono_arch_unwindinfo_create (monoui);
1148 unwindinfo = (MonoUnwindInfo*)*monoui;
1150 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1151 g_error ("Larger allocation needed for the unwind information.");
1153 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1154 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1155 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1157 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1158 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1159 unwindcode->OpInfo = reg;
1161 unwindinfo->unwindInfo.FrameRegister = reg;
1163 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1164 g_error ("Adding unwind info in wrong order.");
1166 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1170 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1172 PMonoUnwindInfo unwindinfo;
1173 PUNWIND_CODE unwindcode;
1177 mono_arch_unwindinfo_create (monoui);
1179 unwindinfo = (MonoUnwindInfo*)*monoui;
1182 g_error ("Stack allocation must be equal to or greater than 0x8.");
1186 else if (size <= 0x7FFF8)
1191 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1192 g_error ("Larger allocation needed for the unwind information.");
1194 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1195 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1197 if (codesneeded == 1) {
1198 /*The size of the allocation is
1199 (the number in the OpInfo member) times 8 plus 8*/
1200 unwindcode->OpInfo = (size - 8)/8;
1201 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1204 if (codesneeded == 3) {
1205 /*the unscaled size of the allocation is recorded
1206 in the next two slots in little-endian format*/
1207 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1209 unwindcode->OpInfo = 1;
1212 /*the size of the allocation divided by 8
1213 is recorded in the next slot*/
1214 unwindcode->FrameOffset = size/8;
1216 unwindcode->OpInfo = 0;
1219 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1222 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1224 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1225 g_error ("Adding unwind info in wrong order.");
1227 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1231 mono_arch_unwindinfo_get_size (gpointer monoui)
1233 PMonoUnwindInfo unwindinfo;
1237 unwindinfo = (MonoUnwindInfo*)monoui;
1238 return (8 + sizeof (MonoUnwindInfo)) -
1239 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1243 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1247 PMonoUnwindInfo targetinfo;
1248 MonoDomain *domain = mono_domain_get ();
1250 ji = mono_jit_info_table_find (domain, (char*)ControlPc);
1254 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1256 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1258 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1260 return &targetinfo->runtimeFunction;
1264 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1266 PMonoUnwindInfo unwindinfo, targetinfo;
1268 guint64 targetlocation;
1272 unwindinfo = (MonoUnwindInfo*)*monoui;
1273 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1274 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1276 unwindinfo->runtimeFunction.EndAddress = code_size;
1277 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1279 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1281 codecount = unwindinfo->unwindInfo.CountOfCodes;
1283 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1284 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1287 g_free (unwindinfo);
1290 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1295 #if MONO_SUPPORT_TASKLETS
1296 MonoContinuationRestore
1297 mono_tasklets_arch_restore (void)
1299 static guint8* saved = NULL;
1300 guint8 *code, *start;
1301 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1304 return (MonoContinuationRestore)saved;
1305 code = start = mono_global_codeman_reserve (64);
1306 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1307 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1308 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1309 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1310 * We move cont to cont_reg since we need both rcx and rdi for the copy
1311 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1313 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1314 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1315 /* setup the copy of the stack */
1316 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1317 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1319 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1320 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1321 amd64_prefix (code, X86_REP_PREFIX);
1324 /* now restore the registers from the LMF */
1325 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1326 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1327 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1328 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1329 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1330 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1331 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1332 #ifdef PLATFORM_WIN32
1333 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1334 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1336 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1338 /* restore the lmf chain */
1339 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1340 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1342 /* state is already in rax */
1343 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1344 g_assert ((code - start) <= 64);
1346 return (MonoContinuationRestore)saved;