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 (MonoTrampInfo **info, gboolean aot)
157 guint8 *start = NULL;
159 MonoJumpInfo *ji = NULL;
160 GSList *unwind_ops = NULL;
162 /* 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);
201 *info = mono_tramp_info_create (g_strdup_printf ("restore_context"), start, code - start, ji, unwind_ops);
207 * mono_arch_get_call_filter:
209 * Returns a pointer to a method which calls an exception filter. We
210 * also use this function to call finally handlers (we pass NULL as
211 * @exc object in this case).
214 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
220 MonoJumpInfo *ji = NULL;
221 GSList *unwind_ops = NULL;
223 start = code = mono_global_codeman_reserve (128);
225 /* call_filter (MonoContext *ctx, unsigned long eip) */
228 /* Alloc new frame */
229 amd64_push_reg (code, AMD64_RBP);
230 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
232 /* Save callee saved regs */
234 for (i = 0; i < AMD64_NREG; ++i)
235 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
236 amd64_push_reg (code, i);
242 amd64_push_reg (code, AMD64_RBP);
244 /* Make stack misaligned, the call will make it aligned again */
246 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
249 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
250 /* load callee saved regs */
251 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
252 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
253 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
254 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
255 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
257 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
258 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
261 /* call the handler */
262 amd64_call_reg (code, AMD64_ARG_REG2);
265 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
268 amd64_pop_reg (code, AMD64_RBP);
270 /* Restore callee saved regs */
271 for (i = AMD64_NREG; i >= 0; --i)
272 if (AMD64_IS_CALLEE_SAVED_REG (i))
273 amd64_pop_reg (code, i);
278 g_assert ((code - start) < 128);
280 mono_arch_flush_icache (start, code - start);
283 *info = mono_tramp_info_create (g_strdup_printf ("call_filter"), start, code - start, ji, unwind_ops);
289 * The first few arguments are dummy, to force the other arguments to be passed on
290 * the stack, this avoids overwriting the argument registers in the throw trampoline.
293 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
294 guint64 dummy5, guint64 dummy6,
295 mgreg_t *regs, mgreg_t rip,
296 MonoObject *exc, gboolean rethrow)
298 static void (*restore_context) (MonoContext *);
301 if (!restore_context)
302 restore_context = mono_get_restore_context ();
304 ctx.rsp = regs [AMD64_RSP];
306 ctx.rbx = regs [AMD64_RBX];
307 ctx.rbp = regs [AMD64_RBP];
308 ctx.r12 = regs [AMD64_R12];
309 ctx.r13 = regs [AMD64_R13];
310 ctx.r14 = regs [AMD64_R14];
311 ctx.r15 = regs [AMD64_R15];
312 ctx.rdi = regs [AMD64_RDI];
313 ctx.rsi = regs [AMD64_RSI];
314 ctx.rax = regs [AMD64_RAX];
315 ctx.rcx = regs [AMD64_RCX];
316 ctx.rdx = regs [AMD64_RDX];
318 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
319 MonoException *mono_ex = (MonoException*)exc;
321 mono_ex->stack_trace = NULL;
324 if (mono_debug_using_mono_debugger ()) {
325 guint8 buf [16], *code;
327 mono_breakpoint_clean_code (NULL, (gpointer)rip, 8, buf, sizeof (buf));
330 if (buf [3] == 0xe8) {
331 MonoContext ctx_cp = ctx;
332 ctx_cp.rip = rip - 5;
334 if (mono_debugger_handle_exception (&ctx_cp, exc)) {
335 restore_context (&ctx_cp);
336 g_assert_not_reached ();
341 /* adjust eip so that it point into the call instruction */
344 mono_handle_exception (&ctx, exc, (gpointer)rip, FALSE);
345 restore_context (&ctx);
347 g_assert_not_reached ();
351 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
352 guint64 dummy5, guint64 dummy6,
353 mgreg_t *regs, mgreg_t rip,
354 guint32 ex_token_index, gint64 pc_offset)
356 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
359 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
363 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
366 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, regs, rip, (MonoObject*)ex, FALSE);
370 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
371 guint64 dummy5, guint64 dummy6,
372 mgreg_t *regs, mgreg_t rip,
373 guint32 dummy7, gint64 dummy8)
375 /* Only the register parameters are valid */
378 ctx.rsp = regs [AMD64_RSP];
380 ctx.rbx = regs [AMD64_RBX];
381 ctx.rbp = regs [AMD64_RBP];
382 ctx.r12 = regs [AMD64_R12];
383 ctx.r13 = regs [AMD64_R13];
384 ctx.r14 = regs [AMD64_R14];
385 ctx.r15 = regs [AMD64_R15];
386 ctx.rdi = regs [AMD64_RDI];
387 ctx.rsi = regs [AMD64_RSI];
388 ctx.rax = regs [AMD64_RAX];
389 ctx.rcx = regs [AMD64_RCX];
390 ctx.rdx = regs [AMD64_RDX];
392 mono_resume_unwind (&ctx);
396 * get_throw_trampoline:
398 * Generate a call to mono_amd64_throw_exception/
399 * mono_amd64_throw_corlib_exception.
402 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
406 MonoJumpInfo *ji = NULL;
407 GSList *unwind_ops = NULL;
408 int i, buf_size, stack_size, arg_offsets [16], regs_offset;
411 start = code = mono_global_codeman_reserve (buf_size);
413 /* The stack is unaligned on entry */
414 stack_size = 192 + 8;
419 unwind_ops = mono_arch_get_cie_program ();
422 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
424 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
427 * To hide linux/windows calling convention differences, we pass all arguments on
428 * the stack by passing 6 dummy values in registers.
432 arg_offsets [1] = sizeof (gpointer);
433 arg_offsets [2] = sizeof (gpointer) * 2;
434 arg_offsets [3] = sizeof (gpointer) * 3;
435 regs_offset = sizeof (gpointer) * 4;
438 for (i = 0; i < AMD64_NREG; ++i)
440 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof (gpointer)), i, 8);
442 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof (gpointer));
443 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof (gpointer)), X86_EAX, 8);
444 /* Set arg1 == regs */
445 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, regs_offset);
446 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, 8);
447 /* Set arg2 == eip */
449 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
451 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, 8);
452 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_RAX, 8);
453 /* Set arg3 == exc/ex_token_index */
455 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, 8);
457 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG1, 8);
458 /* Set arg4 == rethrow/pc offset */
460 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], 0, 8);
462 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [3], AMD64_ARG_REG2, 8);
465 * The caller is LLVM code which passes the absolute address not a pc offset,
466 * so compensate by passing 0 as 'rip' and passing the negated abs address as
469 amd64_neg_membase (code, AMD64_RSP, arg_offsets [3]);
471 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], rethrow, 8);
475 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, corlib ? "mono_amd64_throw_corlib_exception" : "mono_amd64_throw_exception");
476 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
478 amd64_mov_reg_imm (code, AMD64_R11, resume_unwind ? (mono_amd64_resume_unwind) : (corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception));
480 amd64_call_reg (code, AMD64_R11);
481 amd64_breakpoint (code);
483 mono_arch_flush_icache (start, code - start);
485 g_assert ((code - start) < buf_size);
488 *info = mono_tramp_info_create (g_strdup (tramp_name), start, code - start, ji, unwind_ops);
494 * mono_arch_get_throw_exception:
496 * Returns a function pointer which can be used to raise
497 * exceptions. The returned function has the following
498 * signature: void (*func) (MonoException *exc);
502 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
504 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
508 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
510 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
514 * mono_arch_get_throw_corlib_exception:
516 * Returns a function pointer which can be used to raise
517 * corlib exceptions. The returned function has the following
518 * signature: void (*func) (guint32 ex_token, guint32 offset);
519 * Here, offset is the offset which needs to be substracted from the caller IP
520 * to get the IP of the throw. Passing the offset has the advantage that it
521 * needs no relocations in the caller.
524 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
526 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
530 * mono_arch_find_jit_info:
532 * This function is used to gather information from @ctx, and store it in @frame_info.
533 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
534 * is modified if needed.
535 * Returns TRUE on success, FALSE otherwise.
538 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
539 MonoJitInfo *ji, MonoContext *ctx,
540 MonoContext *new_ctx, MonoLMF **lmf,
541 StackFrameInfo *frame)
543 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
545 memset (frame, 0, sizeof (StackFrameInfo));
547 frame->managed = FALSE;
552 gssize regs [MONO_MAX_IREGS + 1];
554 guint32 unwind_info_len;
557 frame->type = FRAME_TYPE_MANAGED;
559 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
560 frame->managed = TRUE;
563 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
565 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
567 regs [AMD64_RAX] = new_ctx->rax;
568 regs [AMD64_RBX] = new_ctx->rbx;
569 regs [AMD64_RCX] = new_ctx->rcx;
570 regs [AMD64_RDX] = new_ctx->rdx;
571 regs [AMD64_RBP] = new_ctx->rbp;
572 regs [AMD64_RSP] = new_ctx->rsp;
573 regs [AMD64_RSI] = new_ctx->rsi;
574 regs [AMD64_RDI] = new_ctx->rdi;
575 regs [AMD64_RIP] = new_ctx->rip;
576 regs [AMD64_R12] = new_ctx->r12;
577 regs [AMD64_R13] = new_ctx->r13;
578 regs [AMD64_R14] = new_ctx->r14;
579 regs [AMD64_R15] = new_ctx->r15;
581 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
582 (guint8*)ji->code_start + ji->code_size,
583 ip, regs, MONO_MAX_IREGS + 1, &cfa);
585 new_ctx->rax = regs [AMD64_RAX];
586 new_ctx->rbx = regs [AMD64_RBX];
587 new_ctx->rcx = regs [AMD64_RCX];
588 new_ctx->rdx = regs [AMD64_RDX];
589 new_ctx->rbp = regs [AMD64_RBP];
590 new_ctx->rsp = regs [AMD64_RSP];
591 new_ctx->rsi = regs [AMD64_RSI];
592 new_ctx->rdi = regs [AMD64_RDI];
593 new_ctx->rip = regs [AMD64_RIP];
594 new_ctx->r12 = regs [AMD64_R12];
595 new_ctx->r13 = regs [AMD64_R13];
596 new_ctx->r14 = regs [AMD64_R14];
597 new_ctx->r15 = regs [AMD64_R15];
599 /* The CFA becomes the new SP value */
600 new_ctx->rsp = (gssize)cfa;
605 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
606 /* remove any unused lmf */
607 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
610 #ifndef MONO_AMD64_NO_PUSHES
611 /* Pop arguments off the stack */
613 MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
615 guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (ji->method), mono_method_signature (ji->method)->param_count, arg_info);
616 new_ctx->rsp += stack_to_pop;
624 if (((guint64)(*lmf)->previous_lmf) & 2) {
626 * This LMF entry is created by the soft debug code to mark transitions to
627 * managed code done during invokes.
629 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
631 g_assert (ext->debugger_invoke);
633 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
635 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
637 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
642 if (((guint64)(*lmf)->previous_lmf) & 1) {
643 /* This LMF has the rip field set */
645 } else if ((*lmf)->rsp == 0) {
650 * The rsp field is set just before the call which transitioned to native
651 * code. Obtain the rip from the stack.
653 rip = *(guint64*)((*lmf)->rsp - sizeof (gpointer));
656 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
658 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
659 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
670 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
673 new_ctx->rbp = (*lmf)->rbp;
674 new_ctx->rsp = (*lmf)->rsp;
676 new_ctx->rbx = (*lmf)->rbx;
677 new_ctx->r12 = (*lmf)->r12;
678 new_ctx->r13 = (*lmf)->r13;
679 new_ctx->r14 = (*lmf)->r14;
680 new_ctx->r15 = (*lmf)->r15;
682 new_ctx->rdi = (*lmf)->rdi;
683 new_ctx->rsi = (*lmf)->rsi;
686 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
697 * Called by resuming from a signal handler.
700 handle_signal_exception (gpointer obj, gboolean test_only)
702 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
704 static void (*restore_context) (MonoContext *);
706 if (!restore_context)
707 restore_context = mono_get_restore_context ();
709 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
711 if (mono_debugger_handle_exception (&ctx, (MonoObject *)obj))
714 mono_handle_exception (&ctx, obj, MONO_CONTEXT_GET_IP (&ctx), test_only);
716 restore_context (&ctx);
720 * mono_arch_handle_exception:
722 * @ctx: saved processor state
723 * @obj: the exception object
726 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
728 #if defined(MONO_ARCH_USE_SIGACTION)
729 ucontext_t *ctx = (ucontext_t*)sigctx;
732 * Handling the exception in the signal handler is problematic, since the original
733 * signal is disabled, and we could run arbitrary code though the debugger. So
734 * resume into the normal stack and do most work there if possible.
736 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
737 guint64 sp = UCONTEXT_REG_RSP (ctx);
739 /* Pass the ctx parameter in TLS */
740 mono_arch_sigctx_to_monoctx (ctx, &jit_tls->ex_ctx);
741 /* The others in registers */
742 UCONTEXT_REG_RDI (ctx) = (guint64)obj;
743 UCONTEXT_REG_RSI (ctx) = test_only;
745 /* Allocate a stack frame below the red zone */
747 /* The stack should be unaligned */
750 UCONTEXT_REG_RSP (ctx) = sp;
752 UCONTEXT_REG_RIP (ctx) = (guint64)handle_signal_exception;
758 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
760 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
763 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
765 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
772 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
774 #if defined(MONO_ARCH_USE_SIGACTION)
775 ucontext_t *ctx = (ucontext_t*)sigctx;
777 mctx->rax = UCONTEXT_REG_RAX (ctx);
778 mctx->rbx = UCONTEXT_REG_RBX (ctx);
779 mctx->rcx = UCONTEXT_REG_RCX (ctx);
780 mctx->rdx = UCONTEXT_REG_RDX (ctx);
781 mctx->rbp = UCONTEXT_REG_RBP (ctx);
782 mctx->rsp = UCONTEXT_REG_RSP (ctx);
783 mctx->rsi = UCONTEXT_REG_RSI (ctx);
784 mctx->rdi = UCONTEXT_REG_RDI (ctx);
785 mctx->rip = UCONTEXT_REG_RIP (ctx);
786 mctx->r12 = UCONTEXT_REG_R12 (ctx);
787 mctx->r13 = UCONTEXT_REG_R13 (ctx);
788 mctx->r14 = UCONTEXT_REG_R14 (ctx);
789 mctx->r15 = UCONTEXT_REG_R15 (ctx);
791 MonoContext *ctx = (MonoContext *)sigctx;
793 mctx->rax = ctx->rax;
794 mctx->rbx = ctx->rbx;
795 mctx->rcx = ctx->rcx;
796 mctx->rdx = ctx->rdx;
797 mctx->rbp = ctx->rbp;
798 mctx->rsp = ctx->rsp;
799 mctx->rsi = ctx->rsi;
800 mctx->rdi = ctx->rdi;
801 mctx->rip = ctx->rip;
802 mctx->r12 = ctx->r12;
803 mctx->r13 = ctx->r13;
804 mctx->r14 = ctx->r14;
805 mctx->r15 = ctx->r15;
810 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
812 #if defined(MONO_ARCH_USE_SIGACTION)
813 ucontext_t *ctx = (ucontext_t*)sigctx;
815 UCONTEXT_REG_RAX (ctx) = mctx->rax;
816 UCONTEXT_REG_RBX (ctx) = mctx->rbx;
817 UCONTEXT_REG_RCX (ctx) = mctx->rcx;
818 UCONTEXT_REG_RDX (ctx) = mctx->rdx;
819 UCONTEXT_REG_RBP (ctx) = mctx->rbp;
820 UCONTEXT_REG_RSP (ctx) = mctx->rsp;
821 UCONTEXT_REG_RSI (ctx) = mctx->rsi;
822 UCONTEXT_REG_RDI (ctx) = mctx->rdi;
823 UCONTEXT_REG_RIP (ctx) = mctx->rip;
824 UCONTEXT_REG_R12 (ctx) = mctx->r12;
825 UCONTEXT_REG_R13 (ctx) = mctx->r13;
826 UCONTEXT_REG_R14 (ctx) = mctx->r14;
827 UCONTEXT_REG_R15 (ctx) = mctx->r15;
829 MonoContext *ctx = (MonoContext *)sigctx;
831 ctx->rax = mctx->rax;
832 ctx->rbx = mctx->rbx;
833 ctx->rcx = mctx->rcx;
834 ctx->rdx = mctx->rdx;
835 ctx->rbp = mctx->rbp;
836 ctx->rsp = mctx->rsp;
837 ctx->rsi = mctx->rsi;
838 ctx->rdi = mctx->rdi;
839 ctx->rip = mctx->rip;
840 ctx->r12 = mctx->r12;
841 ctx->r13 = mctx->r13;
842 ctx->r14 = mctx->r14;
843 ctx->r15 = mctx->r15;
848 mono_arch_ip_from_context (void *sigctx)
850 #if defined(MONO_ARCH_USE_SIGACTION)
851 ucontext_t *ctx = (ucontext_t*)sigctx;
853 return (gpointer)UCONTEXT_REG_RIP (ctx);
855 MonoContext *ctx = sigctx;
856 return (gpointer)ctx->rip;
861 restore_soft_guard_pages (void)
863 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
864 if (jit_tls->stack_ovf_guard_base)
865 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
869 * this function modifies mctx so that when it is restored, it
870 * won't execcute starting at mctx.eip, but in a function that
871 * will restore the protection on the soft-guard pages and return back to
872 * continue at mctx.eip.
875 prepare_for_guard_pages (MonoContext *mctx)
878 sp = (gpointer)(mctx->rsp);
880 /* the return addr */
881 sp [0] = (gpointer)(mctx->rip);
882 mctx->rip = (guint64)restore_soft_guard_pages;
883 mctx->rsp = (guint64)sp;
887 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
889 void (*restore_context) (MonoContext *);
892 restore_context = mono_get_restore_context ();
893 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
895 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
897 prepare_for_guard_pages (&mctx);
898 restore_context (&mctx);
901 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
903 prepare_for_guard_pages (&mctx);
904 restore_context (&mctx);
908 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
910 #if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_GREGS)
911 MonoException *exc = NULL;
912 ucontext_t *ctx = (ucontext_t*)sigctx;
913 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
918 exc = mono_domain_get ()->stack_overflow_ex;
920 mono_handle_native_sigsegv (SIGSEGV, sigctx);
922 /* setup a call frame on the real stack so that control is returned there
923 * and exception handling can continue.
924 * The frame looks like:
928 * 128 is the size of the red zone
930 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
933 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
934 sp = (gpointer)((char*)sp - frame_size);
935 /* the arguments must be aligned */
936 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
937 /* may need to adjust pointers in the new struct copy, depending on the OS */
938 memcpy (sp + 4, ctx, sizeof (ucontext_t));
939 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
940 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
941 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
942 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(sp + 4);
943 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
944 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
949 mono_amd64_get_original_ip (void)
951 MonoLMF *lmf = mono_get_lmf ();
955 /* Reset the change to previous_lmf */
956 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
962 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
964 guint8 *code, *start;
966 gpointer throw_trampoline;
967 MonoJumpInfo *ji = NULL;
968 GSList *unwind_ops = NULL;
970 start = code = mono_global_codeman_reserve (128);
972 /* We are in the frame of a managed method after a call */
974 * We would like to throw the pending exception in such a way that it looks to
975 * be thrown from the managed method.
978 /* Save registers which might contain the return value of the call */
979 amd64_push_reg (code, AMD64_RAX);
980 amd64_push_reg (code, AMD64_RDX);
982 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
983 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
986 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
988 /* Obtain the pending exception */
990 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
991 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
993 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
995 amd64_call_reg (code, AMD64_R11);
997 /* Check if it is NULL, and branch */
998 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
999 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
1001 /* exc != NULL branch */
1003 /* Save the exc on the stack */
1004 amd64_push_reg (code, AMD64_RAX);
1006 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1008 /* Obtain the original ip and clear the flag in previous_lmf */
1010 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1011 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1013 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1015 amd64_call_reg (code, AMD64_R11);
1018 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
1020 /* Pop saved stuff from the stack */
1021 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
1023 /* Setup arguments for the throw trampoline */
1025 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
1026 /* The trampoline expects the caller ip to be pushed on the stack */
1027 amd64_push_reg (code, AMD64_RAX);
1029 /* Call the throw trampoline */
1031 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
1032 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1034 throw_trampoline = mono_get_throw_exception ();
1035 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1037 /* We use a jump instead of a call so we can push the original ip on the stack */
1038 amd64_jump_reg (code, AMD64_R11);
1040 /* ex == NULL branch */
1041 mono_amd64_patch (br [0], code);
1043 /* Obtain the original ip and clear the flag in previous_lmf */
1045 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1046 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1048 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1050 amd64_call_reg (code, AMD64_R11);
1051 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1053 /* Restore registers */
1054 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1055 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1056 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1057 amd64_pop_reg (code, AMD64_RDX);
1058 amd64_pop_reg (code, AMD64_RAX);
1060 /* Return to original code */
1061 amd64_jump_reg (code, AMD64_R11);
1063 g_assert ((code - start) < 128);
1066 *info = mono_tramp_info_create (g_strdup_printf ("throw_pending_exception"), start, code - start, ji, unwind_ops);
1071 static gpointer throw_pending_exception;
1074 * Called when a thread receives an async exception while executing unmanaged code.
1075 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1076 * the return address on the stack to point to a helper routine which throws the
1080 mono_arch_notify_pending_exc (void)
1082 MonoLMF *lmf = mono_get_lmf ();
1085 /* Not yet started */
1092 if ((guint64)lmf->previous_lmf & 1)
1093 /* Already hijacked or trampoline LMF entry */
1096 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1097 lmf->rip = *(guint64*)(lmf->rsp - 8);
1098 /* Signal that lmf->rip is set */
1099 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1101 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1105 mono_amd64_get_exception_trampolines (gboolean aot)
1107 MonoTrampInfo *info;
1108 GSList *tramps = NULL;
1110 mono_arch_get_throw_pending_exception (&info, aot);
1111 tramps = g_slist_prepend (tramps, info);
1113 /* LLVM needs different throw trampolines */
1114 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1115 tramps = g_slist_prepend (tramps, info);
1117 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1118 tramps = g_slist_prepend (tramps, info);
1120 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1121 tramps = g_slist_prepend (tramps, info);
1127 mono_arch_exceptions_init (void)
1132 if (mono_aot_only) {
1133 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1134 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1135 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1136 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1137 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1138 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1139 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1141 /* Call this to avoid initialization races */
1142 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1144 tramps = mono_amd64_get_exception_trampolines (FALSE);
1145 for (l = tramps; l; l = l->next) {
1146 MonoTrampInfo *info = l->data;
1148 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1149 mono_save_trampoline_xdebug_info (info);
1150 mono_tramp_info_free (info);
1152 g_slist_free (tramps);
1159 * The mono_arch_unwindinfo* methods are used to build and add
1160 * function table info for each emitted method from mono. On Winx64
1161 * the seh handler will not be called if the mono methods are not
1162 * added to the function table.
1164 * We should not need to add non-volatile register info to the
1165 * table since mono stores that info elsewhere. (Except for the register
1169 #define MONO_MAX_UNWIND_CODES 22
1171 typedef union _UNWIND_CODE {
1174 guchar UnwindOp : 4;
1177 gushort FrameOffset;
1178 } UNWIND_CODE, *PUNWIND_CODE;
1180 typedef struct _UNWIND_INFO {
1183 guchar SizeOfProlog;
1184 guchar CountOfCodes;
1185 guchar FrameRegister : 4;
1186 guchar FrameOffset : 4;
1187 /* custom size for mono allowing for mono allowing for*/
1188 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1189 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1190 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1191 /*UWOP_PUSH_NONVOL offset = 15-0*/
1192 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1194 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1196 * OPTIONAL ULONG ExceptionHandler;
1197 * OPTIONAL ULONG FunctionEntry;
1199 * OPTIONAL ULONG ExceptionData[]; */
1200 } UNWIND_INFO, *PUNWIND_INFO;
1204 RUNTIME_FUNCTION runtimeFunction;
1205 UNWIND_INFO unwindInfo;
1206 } MonoUnwindInfo, *PMonoUnwindInfo;
1209 mono_arch_unwindinfo_create (gpointer* monoui)
1211 PMonoUnwindInfo newunwindinfo;
1212 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1213 newunwindinfo->unwindInfo.Version = 1;
1217 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1219 PMonoUnwindInfo unwindinfo;
1220 PUNWIND_CODE unwindcode;
1223 mono_arch_unwindinfo_create (monoui);
1225 unwindinfo = (MonoUnwindInfo*)*monoui;
1227 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1228 g_error ("Larger allocation needed for the unwind information.");
1230 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1231 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1232 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1233 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1234 unwindcode->OpInfo = reg;
1236 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1237 g_error ("Adding unwind info in wrong order.");
1239 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1243 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1245 PMonoUnwindInfo unwindinfo;
1246 PUNWIND_CODE unwindcode;
1249 mono_arch_unwindinfo_create (monoui);
1251 unwindinfo = (MonoUnwindInfo*)*monoui;
1253 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1254 g_error ("Larger allocation needed for the unwind information.");
1256 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1257 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1258 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1260 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1261 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1262 unwindcode->OpInfo = reg;
1264 unwindinfo->unwindInfo.FrameRegister = reg;
1266 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1267 g_error ("Adding unwind info in wrong order.");
1269 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1273 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1275 PMonoUnwindInfo unwindinfo;
1276 PUNWIND_CODE unwindcode;
1280 mono_arch_unwindinfo_create (monoui);
1282 unwindinfo = (MonoUnwindInfo*)*monoui;
1285 g_error ("Stack allocation must be equal to or greater than 0x8.");
1289 else if (size <= 0x7FFF8)
1294 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1295 g_error ("Larger allocation needed for the unwind information.");
1297 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1298 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1300 if (codesneeded == 1) {
1301 /*The size of the allocation is
1302 (the number in the OpInfo member) times 8 plus 8*/
1303 unwindcode->OpInfo = (size - 8)/8;
1304 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1307 if (codesneeded == 3) {
1308 /*the unscaled size of the allocation is recorded
1309 in the next two slots in little-endian format*/
1310 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1312 unwindcode->OpInfo = 1;
1315 /*the size of the allocation divided by 8
1316 is recorded in the next slot*/
1317 unwindcode->FrameOffset = size/8;
1319 unwindcode->OpInfo = 0;
1322 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1325 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1327 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1328 g_error ("Adding unwind info in wrong order.");
1330 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1334 mono_arch_unwindinfo_get_size (gpointer monoui)
1336 PMonoUnwindInfo unwindinfo;
1340 unwindinfo = (MonoUnwindInfo*)monoui;
1341 return (8 + sizeof (MonoUnwindInfo)) -
1342 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1346 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1350 PMonoUnwindInfo targetinfo;
1351 MonoDomain *domain = mono_domain_get ();
1353 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1357 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1359 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1361 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1363 return &targetinfo->runtimeFunction;
1367 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1369 PMonoUnwindInfo unwindinfo, targetinfo;
1371 guint64 targetlocation;
1375 unwindinfo = (MonoUnwindInfo*)*monoui;
1376 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1377 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1379 unwindinfo->runtimeFunction.EndAddress = code_size;
1380 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1382 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1384 codecount = unwindinfo->unwindInfo.CountOfCodes;
1386 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1387 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1390 g_free (unwindinfo);
1393 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1398 #if MONO_SUPPORT_TASKLETS
1399 MonoContinuationRestore
1400 mono_tasklets_arch_restore (void)
1402 static guint8* saved = NULL;
1403 guint8 *code, *start;
1404 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1407 return (MonoContinuationRestore)saved;
1408 code = start = mono_global_codeman_reserve (64);
1409 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1410 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1411 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1412 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1413 * We move cont to cont_reg since we need both rcx and rdi for the copy
1414 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1416 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1417 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1418 /* setup the copy of the stack */
1419 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1420 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1422 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1423 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1424 amd64_prefix (code, X86_REP_PREFIX);
1427 /* now restore the registers from the LMF */
1428 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1429 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1430 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1431 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1432 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1433 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1434 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1436 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1437 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1439 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1441 /* restore the lmf chain */
1442 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1443 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1445 /* state is already in rax */
1446 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1447 g_assert ((code - start) <= 64);
1449 return (MonoContinuationRestore)saved;
1454 * mono_arch_setup_resume_sighandler_ctx:
1456 * Setup CTX so execution continues at FUNC.
1459 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1462 * When resuming from a signal handler, the stack should be misaligned, just like right after
1465 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1466 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1467 MONO_CONTEXT_SET_IP (ctx, func);