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)
700 guint64 *gregs = (guint64 *) &ctx->uc_mcontext;
702 guint64 *gregs = (guint64 *) &ctx->uc_mcontext.gregs;
709 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
711 #ifdef MONO_ARCH_USE_SIGACTION
712 ucontext_t *ctx = (ucontext_t*)sigctx;
714 guint64 *gregs = gregs_from_ucontext (ctx);
716 mctx->rax = gregs [REG_RAX];
717 mctx->rbx = gregs [REG_RBX];
718 mctx->rcx = gregs [REG_RCX];
719 mctx->rdx = gregs [REG_RDX];
720 mctx->rbp = gregs [REG_RBP];
721 mctx->rsp = gregs [REG_RSP];
722 mctx->rsi = gregs [REG_RSI];
723 mctx->rdi = gregs [REG_RDI];
724 mctx->rip = gregs [REG_RIP];
725 mctx->r12 = gregs [REG_R12];
726 mctx->r13 = gregs [REG_R13];
727 mctx->r14 = gregs [REG_R14];
728 mctx->r15 = gregs [REG_R15];
730 MonoContext *ctx = (MonoContext *)sigctx;
732 mctx->rax = ctx->rax;
733 mctx->rbx = ctx->rbx;
734 mctx->rcx = ctx->rcx;
735 mctx->rdx = ctx->rdx;
736 mctx->rbp = ctx->rbp;
737 mctx->rsp = ctx->rsp;
738 mctx->rsi = ctx->rsi;
739 mctx->rdi = ctx->rdi;
740 mctx->rip = ctx->rip;
741 mctx->r12 = ctx->r12;
742 mctx->r13 = ctx->r13;
743 mctx->r14 = ctx->r14;
744 mctx->r15 = ctx->r15;
749 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
751 #ifdef MONO_ARCH_USE_SIGACTION
752 ucontext_t *ctx = (ucontext_t*)sigctx;
754 guint64 *gregs = gregs_from_ucontext (ctx);
756 gregs [REG_RAX] = mctx->rax;
757 gregs [REG_RBX] = mctx->rbx;
758 gregs [REG_RCX] = mctx->rcx;
759 gregs [REG_RDX] = mctx->rdx;
760 gregs [REG_RBP] = mctx->rbp;
761 gregs [REG_RSP] = mctx->rsp;
762 gregs [REG_RSI] = mctx->rsi;
763 gregs [REG_RDI] = mctx->rdi;
764 gregs [REG_RIP] = mctx->rip;
765 gregs [REG_R12] = mctx->r12;
766 gregs [REG_R13] = mctx->r13;
767 gregs [REG_R14] = mctx->r14;
768 gregs [REG_R15] = mctx->r15;
770 MonoContext *ctx = (MonoContext *)sigctx;
772 ctx->rax = mctx->rax;
773 ctx->rbx = mctx->rbx;
774 ctx->rcx = mctx->rcx;
775 ctx->rdx = mctx->rdx;
776 ctx->rbp = mctx->rbp;
777 ctx->rsp = mctx->rsp;
778 ctx->rsi = mctx->rsi;
779 ctx->rdi = mctx->rdi;
780 ctx->rip = mctx->rip;
781 ctx->r12 = mctx->r12;
782 ctx->r13 = mctx->r13;
783 ctx->r14 = mctx->r14;
784 ctx->r15 = mctx->r15;
789 mono_arch_ip_from_context (void *sigctx)
792 #ifdef MONO_ARCH_USE_SIGACTION
794 ucontext_t *ctx = (ucontext_t*)sigctx;
796 guint64 *gregs = gregs_from_ucontext (ctx);
798 return (gpointer)gregs [REG_RIP];
800 MonoContext *ctx = sigctx;
801 return (gpointer)ctx->rip;
806 restore_soft_guard_pages (void)
808 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
809 if (jit_tls->stack_ovf_guard_base)
810 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
814 * this function modifies mctx so that when it is restored, it
815 * won't execcute starting at mctx.eip, but in a function that
816 * will restore the protection on the soft-guard pages and return back to
817 * continue at mctx.eip.
820 prepare_for_guard_pages (MonoContext *mctx)
823 sp = (gpointer)(mctx->rsp);
825 /* the return addr */
826 sp [0] = (gpointer)(mctx->rip);
827 mctx->rip = (guint64)restore_soft_guard_pages;
828 mctx->rsp = (guint64)sp;
832 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
834 void (*restore_context) (MonoContext *);
837 restore_context = mono_get_restore_context ();
838 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
840 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
842 prepare_for_guard_pages (&mctx);
843 restore_context (&mctx);
846 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
848 prepare_for_guard_pages (&mctx);
849 restore_context (&mctx);
853 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
855 #ifdef MONO_ARCH_USE_SIGACTION
856 MonoException *exc = NULL;
857 ucontext_t *ctx = (ucontext_t*)sigctx;
858 guint64 *gregs = gregs_from_ucontext (ctx);
859 MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), (gpointer)gregs [REG_RIP]);
864 exc = mono_domain_get ()->stack_overflow_ex;
866 mono_handle_native_sigsegv (SIGSEGV, sigctx);
868 /* setup a call frame on the real stack so that control is returned there
869 * and exception handling can continue.
870 * The frame looks like:
874 * 128 is the size of the red zone
876 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
879 sp = (gpointer)(gregs [REG_RSP] & ~15);
880 sp = (gpointer)((char*)sp - frame_size);
881 /* the arguments must be aligned */
882 sp [-1] = (gpointer)gregs [REG_RIP];
883 /* may need to adjust pointers in the new struct copy, depending on the OS */
884 memcpy (sp + 4, ctx, sizeof (ucontext_t));
885 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
886 gregs [REG_RIP] = (unsigned long)altstack_handle_and_restore;
887 gregs [REG_RSP] = (unsigned long)(sp - 1);
888 gregs [REG_RDI] = (unsigned long)(sp + 4);
889 gregs [REG_RSI] = (guint64)exc;
890 gregs [REG_RDX] = stack_ovf;
895 mono_amd64_get_original_ip (void)
897 MonoLMF *lmf = mono_get_lmf ();
901 /* Reset the change to previous_lmf */
902 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
908 mono_arch_get_throw_pending_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
910 guint8 *code, *start;
912 gpointer throw_trampoline;
916 start = code = mono_global_codeman_reserve (128);
918 /* We are in the frame of a managed method after a call */
920 * We would like to throw the pending exception in such a way that it looks to
921 * be thrown from the managed method.
924 /* Save registers which might contain the return value of the call */
925 amd64_push_reg (code, AMD64_RAX);
926 amd64_push_reg (code, AMD64_RDX);
928 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
929 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
932 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
934 /* Obtain the pending exception */
936 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
937 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
939 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
941 amd64_call_reg (code, AMD64_R11);
943 /* Check if it is NULL, and branch */
944 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
945 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
947 /* exc != NULL branch */
949 /* Save the exc on the stack */
950 amd64_push_reg (code, AMD64_RAX);
952 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
954 /* Obtain the original ip and clear the flag in previous_lmf */
956 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
957 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
959 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
961 amd64_call_reg (code, AMD64_R11);
964 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
966 /* Pop saved stuff from the stack */
967 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
969 /* Setup arguments for the throw trampoline */
971 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
972 /* The trampoline expects the caller ip to be pushed on the stack */
973 amd64_push_reg (code, AMD64_RAX);
975 /* Call the throw trampoline */
977 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
978 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
980 throw_trampoline = mono_get_throw_exception ();
981 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
983 /* We use a jump instead of a call so we can push the original ip on the stack */
984 amd64_jump_reg (code, AMD64_R11);
986 /* ex == NULL branch */
987 mono_amd64_patch (br [0], code);
989 /* Obtain the original ip and clear the flag in previous_lmf */
991 *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
992 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
994 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
996 amd64_call_reg (code, AMD64_R11);
997 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
999 /* Restore registers */
1000 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1001 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1002 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1003 amd64_pop_reg (code, AMD64_RDX);
1004 amd64_pop_reg (code, AMD64_RAX);
1006 /* Return to original code */
1007 amd64_jump_reg (code, AMD64_R11);
1009 g_assert ((code - start) < 128);
1011 *code_size = code - start;
1016 static gpointer throw_pending_exception;
1019 * Called when a thread receives an async exception while executing unmanaged code.
1020 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1021 * the return address on the stack to point to a helper routine which throws the
1025 mono_arch_notify_pending_exc (void)
1027 MonoLMF *lmf = mono_get_lmf ();
1033 if ((guint64)lmf->previous_lmf & 1)
1034 /* Already hijacked or trampoline LMF entry */
1037 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1038 lmf->rip = *(guint64*)(lmf->rsp - 8);
1039 /* Signal that lmf->rip is set */
1040 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1042 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1046 mono_arch_exceptions_init (void)
1051 if (mono_aot_only) {
1052 throw_pending_exception = mono_aot_get_named_code ("throw_pending_exception");
1054 /* Call this to avoid initialization races */
1055 throw_pending_exception = mono_arch_get_throw_pending_exception_full (&code_size, &ji, FALSE);
1059 #ifdef PLATFORM_WIN32
1062 * The mono_arch_unwindinfo* methods are used to build and add
1063 * function table info for each emitted method from mono. On Winx64
1064 * the seh handler will not be called if the mono methods are not
1065 * added to the function table.
1067 * We should not need to add non-volatile register info to the
1068 * table since mono stores that info elsewhere. (Except for the register
1072 #define MONO_MAX_UNWIND_CODES 22
1074 typedef union _UNWIND_CODE {
1077 guchar UnwindOp : 4;
1080 gushort FrameOffset;
1081 } UNWIND_CODE, *PUNWIND_CODE;
1083 typedef struct _UNWIND_INFO {
1086 guchar SizeOfProlog;
1087 guchar CountOfCodes;
1088 guchar FrameRegister : 4;
1089 guchar FrameOffset : 4;
1090 /* custom size for mono allowing for mono allowing for*/
1091 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1092 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1093 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1094 /*UWOP_PUSH_NONVOL offset = 15-0*/
1095 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1097 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1099 * OPTIONAL ULONG ExceptionHandler;
1100 * OPTIONAL ULONG FunctionEntry;
1102 * OPTIONAL ULONG ExceptionData[]; */
1103 } UNWIND_INFO, *PUNWIND_INFO;
1107 RUNTIME_FUNCTION runtimeFunction;
1108 UNWIND_INFO unwindInfo;
1109 } MonoUnwindInfo, *PMonoUnwindInfo;
1112 mono_arch_unwindinfo_create (gpointer* monoui)
1114 PMonoUnwindInfo newunwindinfo;
1115 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1116 newunwindinfo->unwindInfo.Version = 1;
1120 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1122 PMonoUnwindInfo unwindinfo;
1123 PUNWIND_CODE unwindcode;
1126 mono_arch_unwindinfo_create (monoui);
1128 unwindinfo = (MonoUnwindInfo*)*monoui;
1130 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1131 g_error ("Larger allocation needed for the unwind information.");
1133 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1134 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1135 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1136 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1137 unwindcode->OpInfo = reg;
1139 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1140 g_error ("Adding unwind info in wrong order.");
1142 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1146 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1148 PMonoUnwindInfo unwindinfo;
1149 PUNWIND_CODE unwindcode;
1152 mono_arch_unwindinfo_create (monoui);
1154 unwindinfo = (MonoUnwindInfo*)*monoui;
1156 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1157 g_error ("Larger allocation needed for the unwind information.");
1159 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1160 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1161 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1163 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1164 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1165 unwindcode->OpInfo = reg;
1167 unwindinfo->unwindInfo.FrameRegister = reg;
1169 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1170 g_error ("Adding unwind info in wrong order.");
1172 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1176 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1178 PMonoUnwindInfo unwindinfo;
1179 PUNWIND_CODE unwindcode;
1183 mono_arch_unwindinfo_create (monoui);
1185 unwindinfo = (MonoUnwindInfo*)*monoui;
1188 g_error ("Stack allocation must be equal to or greater than 0x8.");
1192 else if (size <= 0x7FFF8)
1197 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1198 g_error ("Larger allocation needed for the unwind information.");
1200 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1201 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1203 if (codesneeded == 1) {
1204 /*The size of the allocation is
1205 (the number in the OpInfo member) times 8 plus 8*/
1206 unwindcode->OpInfo = (size - 8)/8;
1207 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1210 if (codesneeded == 3) {
1211 /*the unscaled size of the allocation is recorded
1212 in the next two slots in little-endian format*/
1213 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1215 unwindcode->OpInfo = 1;
1218 /*the size of the allocation divided by 8
1219 is recorded in the next slot*/
1220 unwindcode->FrameOffset = size/8;
1222 unwindcode->OpInfo = 0;
1225 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1228 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1230 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1231 g_error ("Adding unwind info in wrong order.");
1233 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1237 mono_arch_unwindinfo_get_size (gpointer monoui)
1239 PMonoUnwindInfo unwindinfo;
1243 unwindinfo = (MonoUnwindInfo*)monoui;
1244 return (8 + sizeof (MonoUnwindInfo)) -
1245 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1249 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1253 PMonoUnwindInfo targetinfo;
1254 MonoDomain *domain = mono_domain_get ();
1256 ji = mono_jit_info_table_find (domain, (char*)ControlPc);
1260 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1262 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1264 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1266 return &targetinfo->runtimeFunction;
1270 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1272 PMonoUnwindInfo unwindinfo, targetinfo;
1274 guint64 targetlocation;
1278 unwindinfo = (MonoUnwindInfo*)*monoui;
1279 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1280 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1282 unwindinfo->runtimeFunction.EndAddress = code_size;
1283 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1285 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1287 codecount = unwindinfo->unwindInfo.CountOfCodes;
1289 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1290 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1293 g_free (unwindinfo);
1296 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1301 #if MONO_SUPPORT_TASKLETS
1302 MonoContinuationRestore
1303 mono_tasklets_arch_restore (void)
1305 static guint8* saved = NULL;
1306 guint8 *code, *start;
1307 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1310 return (MonoContinuationRestore)saved;
1311 code = start = mono_global_codeman_reserve (64);
1312 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1313 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1314 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1315 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1316 * We move cont to cont_reg since we need both rcx and rdi for the copy
1317 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1319 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1320 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1321 /* setup the copy of the stack */
1322 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1323 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1325 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1326 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1327 amd64_prefix (code, X86_REP_PREFIX);
1330 /* now restore the registers from the LMF */
1331 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1332 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1333 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1334 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1335 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1336 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1337 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1338 #ifdef PLATFORM_WIN32
1339 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1340 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1342 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1344 /* restore the lmf chain */
1345 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1346 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1348 /* state is already in rax */
1349 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1350 g_assert ((code - start) <= 64);
1352 return (MonoContinuationRestore)saved;