2 * exceptions-amd64.c: exception support for AMD64
5 * Dietmar Maurer (dietmar@ximian.com)
7 * (C) 2001 Ximian, Inc.
8 * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
17 #ifdef HAVE_UCONTEXT_H
21 #include <mono/arch/amd64/amd64-codegen.h>
22 #include <mono/metadata/abi-details.h>
23 #include <mono/metadata/appdomain.h>
24 #include <mono/metadata/tabledefs.h>
25 #include <mono/metadata/threads.h>
26 #include <mono/metadata/threads-types.h>
27 #include <mono/metadata/debug-helpers.h>
28 #include <mono/metadata/exception.h>
29 #include <mono/metadata/gc-internal.h>
30 #include <mono/metadata/mono-debug.h>
31 #include <mono/utils/mono-mmap.h>
34 #include "mini-amd64.h"
37 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
40 static MonoW32ExceptionHandler fpe_handler;
41 static MonoW32ExceptionHandler ill_handler;
42 static MonoW32ExceptionHandler segv_handler;
44 LPTOP_LEVEL_EXCEPTION_FILTER mono_old_win_toplevel_exception_filter;
45 void *mono_win_vectored_exception_handle;
47 #define W32_SEH_HANDLE_EX(_ex) \
48 if (_ex##_handler) _ex##_handler(0, ep, sctx)
50 static LONG CALLBACK seh_unhandled_exception_filter(EXCEPTION_POINTERS* ep)
52 #ifndef MONO_CROSS_COMPILE
53 if (mono_old_win_toplevel_exception_filter) {
54 return (*mono_old_win_toplevel_exception_filter)(ep);
58 mono_handle_native_sigsegv (SIGSEGV, NULL);
60 return EXCEPTION_CONTINUE_SEARCH;
64 * Unhandled Exception Filter
65 * Top-level per-process exception handler.
67 static LONG CALLBACK seh_vectored_exception_handler(EXCEPTION_POINTERS* ep)
73 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
75 /* If the thread is not managed by the runtime return early */
77 return EXCEPTION_CONTINUE_SEARCH;
79 jit_tls->mono_win_chained_exception_needs_run = FALSE;
80 res = EXCEPTION_CONTINUE_EXECUTION;
82 er = ep->ExceptionRecord;
83 ctx = ep->ContextRecord;
84 sctx = g_malloc(sizeof(MonoContext));
86 /* Copy Win32 context to UNIX style context */
101 switch (er->ExceptionCode) {
102 case EXCEPTION_ACCESS_VIOLATION:
103 W32_SEH_HANDLE_EX(segv);
105 case EXCEPTION_ILLEGAL_INSTRUCTION:
106 W32_SEH_HANDLE_EX(ill);
108 case EXCEPTION_INT_DIVIDE_BY_ZERO:
109 case EXCEPTION_INT_OVERFLOW:
110 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
111 case EXCEPTION_FLT_OVERFLOW:
112 case EXCEPTION_FLT_UNDERFLOW:
113 case EXCEPTION_FLT_INEXACT_RESULT:
114 W32_SEH_HANDLE_EX(fpe);
117 jit_tls->mono_win_chained_exception_needs_run = TRUE;
121 if (jit_tls->mono_win_chained_exception_needs_run) {
122 /* Don't copy context back if we chained exception
123 * as the handler may have modfied the EXCEPTION_POINTERS
124 * directly. We don't pass sigcontext to chained handlers.
125 * Return continue search so the UnhandledExceptionFilter
126 * can correctly chain the exception.
128 res = EXCEPTION_CONTINUE_SEARCH;
130 /* Copy context back */
132 ctx->Rsp = sctx->rsp;
133 ctx->Rdi = sctx->rdi;
134 ctx->Rsi = sctx->rsi;
135 ctx->Rbx = sctx->rbx;
136 ctx->Rbp = sctx->rbp;
137 ctx->R12 = sctx->r12;
138 ctx->R13 = sctx->r13;
139 ctx->R14 = sctx->r14;
140 ctx->R15 = sctx->r15;
141 ctx->Rip = sctx->rip;
143 /* Volatile But should not matter?*/
144 ctx->Rax = sctx->rax;
145 ctx->Rcx = sctx->rcx;
146 ctx->Rdx = sctx->rdx;
149 /* TODO: Find right place to free this in stack overflow case */
150 if (er->ExceptionCode != EXCEPTION_STACK_OVERFLOW)
156 void win32_seh_init()
158 mono_old_win_toplevel_exception_filter = SetUnhandledExceptionFilter(seh_unhandled_exception_filter);
159 mono_win_vectored_exception_handle = AddVectoredExceptionHandler (1, seh_vectored_exception_handler);
162 void win32_seh_cleanup()
166 if (mono_old_win_toplevel_exception_filter) SetUnhandledExceptionFilter(mono_old_win_toplevel_exception_filter);
168 ret = RemoveVectoredExceptionHandler (mono_win_vectored_exception_handle);
172 void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
176 fpe_handler = handler;
179 ill_handler = handler;
182 segv_handler = handler;
189 #endif /* TARGET_WIN32 */
192 * mono_arch_get_restore_context:
194 * Returns a pointer to a method which restores a previously saved sigcontext.
197 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
199 guint8 *start = NULL;
201 MonoJumpInfo *ji = NULL;
202 GSList *unwind_ops = NULL;
204 /* restore_contect (MonoContext *ctx) */
206 start = code = mono_global_codeman_reserve (256);
208 amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
210 /* Restore all registers except %rip and %r11 */
211 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rax), 8);
212 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rcx), 8);
213 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rdx), 8);
214 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rbx), 8);
215 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rbp), 8);
216 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rsi), 8);
217 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rdi), 8);
218 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r8), 8);
219 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r9), 8);
220 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r10), 8);
221 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r12), 8);
222 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r13), 8);
223 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r14), 8);
224 #if !defined(__native_client_codegen__)
225 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, r15), 8);
229 * The context resides on the stack, in the stack frame of the
230 * caller of this function. The stack pointer that we need to
231 * restore is potentially many stack frames higher up, so the
232 * distance between them can easily be more than the red zone
233 * size. Hence the stack pointer can be restored only after
234 * we have finished loading everything from the context.
236 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rsp), 8);
237 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, MONO_STRUCT_OFFSET (MonoContext, rip), 8);
238 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
240 /* jump to the saved IP */
241 amd64_jump_reg (code, AMD64_R11);
243 nacl_global_codeman_validate(&start, 256, &code);
245 mono_arch_flush_icache (start, code - start);
248 *info = mono_tramp_info_create ("restore_context", start, code - start, ji, unwind_ops);
254 * mono_arch_get_call_filter:
256 * Returns a pointer to a method which calls an exception filter. We
257 * also use this function to call finally handlers (we pass NULL as
258 * @exc object in this case).
261 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
267 MonoJumpInfo *ji = NULL;
268 GSList *unwind_ops = NULL;
269 const guint kMaxCodeSize = NACL_SIZE (128, 256);
271 start = code = mono_global_codeman_reserve (kMaxCodeSize);
273 /* call_filter (MonoContext *ctx, unsigned long eip) */
276 /* Alloc new frame */
277 amd64_push_reg (code, AMD64_RBP);
278 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
280 /* Save callee saved regs */
282 for (i = 0; i < AMD64_NREG; ++i)
283 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
284 amd64_push_reg (code, i);
290 amd64_push_reg (code, AMD64_RBP);
292 /* Make stack misaligned, the call will make it aligned again */
294 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
297 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rbp), 8);
298 /* load callee saved regs */
299 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rbx), 8);
300 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r12), 8);
301 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r13), 8);
302 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r14), 8);
303 #if !defined(__native_client_codegen__)
304 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, r15), 8);
307 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rdi), 8);
308 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, MONO_STRUCT_OFFSET (MonoContext, rsi), 8);
311 /* call the handler */
312 amd64_call_reg (code, AMD64_ARG_REG2);
315 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
318 amd64_pop_reg (code, AMD64_RBP);
320 /* Restore callee saved regs */
321 for (i = AMD64_NREG; i >= 0; --i)
322 if (AMD64_IS_CALLEE_SAVED_REG (i))
323 amd64_pop_reg (code, i);
328 g_assert ((code - start) < kMaxCodeSize);
330 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
332 mono_arch_flush_icache (start, code - start);
335 *info = mono_tramp_info_create ("call_filter", start, code - start, ji, unwind_ops);
341 * The first few arguments are dummy, to force the other arguments to be passed on
342 * the stack, this avoids overwriting the argument registers in the throw trampoline.
345 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
346 guint64 dummy5, guint64 dummy6,
347 mgreg_t *regs, mgreg_t rip,
348 MonoObject *exc, gboolean rethrow)
352 ctx.rsp = regs [AMD64_RSP];
354 ctx.rbx = regs [AMD64_RBX];
355 ctx.rbp = regs [AMD64_RBP];
356 ctx.r12 = regs [AMD64_R12];
357 ctx.r13 = regs [AMD64_R13];
358 ctx.r14 = regs [AMD64_R14];
359 ctx.r15 = regs [AMD64_R15];
360 ctx.rdi = regs [AMD64_RDI];
361 ctx.rsi = regs [AMD64_RSI];
362 ctx.rax = regs [AMD64_RAX];
363 ctx.rcx = regs [AMD64_RCX];
364 ctx.rdx = regs [AMD64_RDX];
366 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
367 MonoException *mono_ex = (MonoException*)exc;
369 mono_ex->stack_trace = NULL;
372 /* adjust eip so that it point into the call instruction */
375 mono_handle_exception (&ctx, exc);
376 mono_restore_context (&ctx);
377 g_assert_not_reached ();
381 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
382 guint64 dummy5, guint64 dummy6,
383 mgreg_t *regs, mgreg_t rip,
384 guint32 ex_token_index, gint64 pc_offset)
386 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
389 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
393 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
396 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, regs, rip, (MonoObject*)ex, FALSE);
400 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
401 guint64 dummy5, guint64 dummy6,
402 mgreg_t *regs, mgreg_t rip,
403 guint32 dummy7, gint64 dummy8)
405 /* Only the register parameters are valid */
408 ctx.rsp = regs [AMD64_RSP];
410 ctx.rbx = regs [AMD64_RBX];
411 ctx.rbp = regs [AMD64_RBP];
412 ctx.r12 = regs [AMD64_R12];
413 ctx.r13 = regs [AMD64_R13];
414 ctx.r14 = regs [AMD64_R14];
415 ctx.r15 = regs [AMD64_R15];
416 ctx.rdi = regs [AMD64_RDI];
417 ctx.rsi = regs [AMD64_RSI];
418 ctx.rax = regs [AMD64_RAX];
419 ctx.rcx = regs [AMD64_RCX];
420 ctx.rdx = regs [AMD64_RDX];
422 mono_resume_unwind (&ctx);
426 * get_throw_trampoline:
428 * Generate a call to mono_amd64_throw_exception/
429 * mono_amd64_throw_corlib_exception.
432 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
436 MonoJumpInfo *ji = NULL;
437 GSList *unwind_ops = NULL;
438 int i, stack_size, arg_offsets [16], regs_offset, dummy_stack_space;
439 const guint kMaxCodeSize = NACL_SIZE (256, 512);
442 dummy_stack_space = 6 * sizeof(mgreg_t); /* Windows expects stack space allocated for all 6 dummy args. */
444 dummy_stack_space = 0;
447 start = code = mono_global_codeman_reserve (kMaxCodeSize);
449 /* The stack is unaligned on entry */
450 stack_size = 192 + 8 + dummy_stack_space;
455 unwind_ops = mono_arch_get_cie_program ();
458 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
460 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
463 * To hide linux/windows calling convention differences, we pass all arguments on
464 * the stack by passing 6 dummy values in registers.
467 arg_offsets [0] = dummy_stack_space + 0;
468 arg_offsets [1] = dummy_stack_space + sizeof(mgreg_t);
469 arg_offsets [2] = dummy_stack_space + sizeof(mgreg_t) * 2;
470 arg_offsets [3] = dummy_stack_space + sizeof(mgreg_t) * 3;
471 regs_offset = dummy_stack_space + sizeof(mgreg_t) * 4;
474 for (i = 0; i < AMD64_NREG; ++i)
476 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
478 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof(mgreg_t));
479 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof(mgreg_t)), X86_EAX, sizeof(mgreg_t));
480 /* Set arg1 == regs */
481 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, regs_offset);
482 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, sizeof(mgreg_t));
483 /* Set arg2 == eip */
485 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
487 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, sizeof(mgreg_t));
488 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_RAX, sizeof(mgreg_t));
489 /* Set arg3 == exc/ex_token_index */
491 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, sizeof(mgreg_t));
493 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG1, sizeof(mgreg_t));
494 /* Set arg4 == rethrow/pc offset */
496 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], 0, sizeof(mgreg_t));
498 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [3], AMD64_ARG_REG2, sizeof(mgreg_t));
501 * The caller is LLVM code which passes the absolute address not a pc offset,
502 * so compensate by passing 0 as 'rip' and passing the negated abs address as
505 amd64_neg_membase (code, AMD64_RSP, arg_offsets [3]);
507 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], rethrow, sizeof(mgreg_t));
511 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");
512 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
514 amd64_mov_reg_imm (code, AMD64_R11, resume_unwind ? ((gpointer)mono_amd64_resume_unwind) : (corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception));
516 amd64_call_reg (code, AMD64_R11);
517 amd64_breakpoint (code);
519 mono_arch_flush_icache (start, code - start);
521 g_assert ((code - start) < kMaxCodeSize);
523 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
526 *info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
532 * mono_arch_get_throw_exception:
534 * Returns a function pointer which can be used to raise
535 * exceptions. The returned function has the following
536 * signature: void (*func) (MonoException *exc);
540 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
542 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
546 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
548 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
552 * mono_arch_get_throw_corlib_exception:
554 * Returns a function pointer which can be used to raise
555 * corlib exceptions. The returned function has the following
556 * signature: void (*func) (guint32 ex_token, guint32 offset);
557 * Here, offset is the offset which needs to be substracted from the caller IP
558 * to get the IP of the throw. Passing the offset has the advantage that it
559 * needs no relocations in the caller.
562 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
564 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
568 * mono_arch_find_jit_info:
570 * This function is used to gather information from @ctx, and store it in @frame_info.
571 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
572 * is modified if needed.
573 * Returns TRUE on success, FALSE otherwise.
576 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
577 MonoJitInfo *ji, MonoContext *ctx,
578 MonoContext *new_ctx, MonoLMF **lmf,
579 mgreg_t **save_locations,
580 StackFrameInfo *frame)
582 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
584 memset (frame, 0, sizeof (StackFrameInfo));
590 mgreg_t regs [MONO_MAX_IREGS + 1];
592 guint32 unwind_info_len;
596 frame->type = FRAME_TYPE_MANAGED;
598 unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
600 frame->unwind_info = unwind_info;
601 frame->unwind_info_len = unwind_info_len;
604 printf ("%s %p %p\n", ji->d.method->name, ji->code_start, ip);
605 mono_print_unwind_info (unwind_info, unwind_info_len);
607 epilog = (guint8*)ji->code_start + ji->code_size - mono_jinfo_get_epilog_size (ji);
609 regs [AMD64_RAX] = new_ctx->rax;
610 regs [AMD64_RBX] = new_ctx->rbx;
611 regs [AMD64_RCX] = new_ctx->rcx;
612 regs [AMD64_RDX] = new_ctx->rdx;
613 regs [AMD64_RBP] = new_ctx->rbp;
614 regs [AMD64_RSP] = new_ctx->rsp;
615 regs [AMD64_RSI] = new_ctx->rsi;
616 regs [AMD64_RDI] = new_ctx->rdi;
617 regs [AMD64_RIP] = new_ctx->rip;
618 regs [AMD64_R12] = new_ctx->r12;
619 regs [AMD64_R13] = new_ctx->r13;
620 regs [AMD64_R14] = new_ctx->r14;
621 regs [AMD64_R15] = new_ctx->r15;
623 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
624 (guint8*)ji->code_start + ji->code_size,
625 ip, &epilog, regs, MONO_MAX_IREGS + 1,
626 save_locations, MONO_MAX_IREGS, &cfa);
628 new_ctx->rax = regs [AMD64_RAX];
629 new_ctx->rbx = regs [AMD64_RBX];
630 new_ctx->rcx = regs [AMD64_RCX];
631 new_ctx->rdx = regs [AMD64_RDX];
632 new_ctx->rbp = regs [AMD64_RBP];
633 new_ctx->rsp = regs [AMD64_RSP];
634 new_ctx->rsi = regs [AMD64_RSI];
635 new_ctx->rdi = regs [AMD64_RDI];
636 new_ctx->rip = regs [AMD64_RIP];
637 new_ctx->r12 = regs [AMD64_R12];
638 new_ctx->r13 = regs [AMD64_R13];
639 new_ctx->r14 = regs [AMD64_R14];
640 new_ctx->r15 = regs [AMD64_R15];
642 /* The CFA becomes the new SP value */
643 new_ctx->rsp = (mgreg_t)cfa;
648 #ifndef MONO_AMD64_NO_PUSHES
649 /* Pop arguments off the stack */
650 if (ji->has_arch_eh_info)
651 new_ctx->rsp += mono_jit_info_get_arch_eh_info (ji)->stack_size;
658 if (((guint64)(*lmf)->previous_lmf) & 2) {
660 * This LMF entry is created by the soft debug code to mark transitions to
661 * managed code done during invokes.
663 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
665 g_assert (ext->debugger_invoke);
667 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
669 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
671 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
676 if (((guint64)(*lmf)->previous_lmf) & 1) {
677 /* This LMF has the rip field set */
679 } else if ((*lmf)->rsp == 0) {
684 * The rsp field is set just before the call which transitioned to native
685 * code. Obtain the rip from the stack.
687 rip = *(guint64*)((*lmf)->rsp - sizeof(mgreg_t));
690 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
692 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
693 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
704 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
707 new_ctx->rbp = (*lmf)->rbp;
708 new_ctx->rsp = (*lmf)->rsp;
710 if (((guint64)(*lmf)->previous_lmf) & 4) {
711 MonoLMFTramp *ext = (MonoLMFTramp*)(*lmf);
713 /* Trampoline frame */
714 new_ctx->rbx = ext->regs [AMD64_RBX];
715 new_ctx->r12 = ext->regs [AMD64_R12];
716 new_ctx->r13 = ext->regs [AMD64_R13];
717 new_ctx->r14 = ext->regs [AMD64_R14];
718 new_ctx->r15 = ext->regs [AMD64_R15];
720 new_ctx->rdi = ext->regs [AMD64_RDI];
721 new_ctx->rsi = ext->regs [AMD64_RSI];
725 * The registers saved in the LMF will be restored using the normal unwind info,
726 * when the wrapper frame is processed.
739 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
750 * Called by resuming from a signal handler.
753 handle_signal_exception (gpointer obj)
755 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
758 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
760 mono_handle_exception (&ctx, obj);
762 mono_restore_context (&ctx);
766 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
768 guint64 sp = ctx->rsp;
770 ctx->rdi = (guint64)user_data;
772 /* Allocate a stack frame below the red zone */
774 /* The stack should be unaligned */
778 /* Preserve the call chain to prevent crashes in the libgcc unwinder (#15969) */
779 *(guint64*)sp = ctx->rip;
782 ctx->rip = (guint64)async_cb;
786 * mono_arch_handle_exception:
788 * @ctx: saved processor state
789 * @obj: the exception object
792 mono_arch_handle_exception (void *sigctx, gpointer obj)
794 #if defined(MONO_ARCH_USE_SIGACTION)
798 * Handling the exception in the signal handler is problematic, since the original
799 * signal is disabled, and we could run arbitrary code though the debugger. So
800 * resume into the normal stack and do most work there if possible.
802 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
804 /* Pass the ctx parameter in TLS */
805 mono_arch_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
807 mctx = jit_tls->ex_ctx;
808 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
809 mono_monoctx_to_sigctx (&mctx, sigctx);
815 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
817 mono_handle_exception (&mctx, obj);
819 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
826 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
828 mono_sigctx_to_monoctx (sigctx, mctx);
832 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
834 mono_monoctx_to_sigctx (mctx, sigctx);
838 mono_arch_ip_from_context (void *sigctx)
840 #if defined(MONO_ARCH_USE_SIGACTION)
841 ucontext_t *ctx = (ucontext_t*)sigctx;
843 return (gpointer)UCONTEXT_REG_RIP (ctx);
845 MonoContext *ctx = sigctx;
846 return (gpointer)ctx->rip;
851 restore_soft_guard_pages (void)
853 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
854 if (jit_tls->stack_ovf_guard_base)
855 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
859 * this function modifies mctx so that when it is restored, it
860 * won't execcute starting at mctx.eip, but in a function that
861 * will restore the protection on the soft-guard pages and return back to
862 * continue at mctx.eip.
865 prepare_for_guard_pages (MonoContext *mctx)
868 sp = (gpointer)(mctx->rsp);
870 /* the return addr */
871 sp [0] = (gpointer)(mctx->rip);
872 mctx->rip = (guint64)restore_soft_guard_pages;
873 mctx->rsp = (guint64)sp;
877 altstack_handle_and_restore (MonoContext *ctx, gpointer obj, gboolean stack_ovf)
883 mono_handle_exception (&mctx, obj);
885 prepare_for_guard_pages (&mctx);
886 mono_restore_context (&mctx);
890 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
892 #if defined(MONO_ARCH_USE_SIGACTION)
893 MonoException *exc = NULL;
894 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
897 MonoContext *copied_ctx;
900 exc = mono_domain_get ()->stack_overflow_ex;
902 mono_handle_native_sigsegv (SIGSEGV, sigctx);
904 /* setup a call frame on the real stack so that control is returned there
905 * and exception handling can continue.
906 * The frame looks like:
910 * 128 is the size of the red zone
912 frame_size = sizeof (MonoContext) + sizeof (gpointer) * 4 + 128;
915 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
916 sp = (gpointer)((char*)sp - frame_size);
917 copied_ctx = (MonoContext*)(sp + 4);
918 /* the arguments must be aligned */
919 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
920 mono_sigctx_to_monoctx (sigctx, copied_ctx);
921 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
922 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
923 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
924 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(copied_ctx);
925 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
926 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
931 mono_amd64_get_original_ip (void)
933 MonoLMF *lmf = mono_get_lmf ();
937 /* Reset the change to previous_lmf */
938 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
944 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
946 guint8 *code, *start;
948 gpointer throw_trampoline;
949 MonoJumpInfo *ji = NULL;
950 GSList *unwind_ops = NULL;
951 const guint kMaxCodeSize = NACL_SIZE (128, 256);
953 start = code = mono_global_codeman_reserve (kMaxCodeSize);
955 /* We are in the frame of a managed method after a call */
957 * We would like to throw the pending exception in such a way that it looks to
958 * be thrown from the managed method.
961 /* Save registers which might contain the return value of the call */
962 amd64_push_reg (code, AMD64_RAX);
963 amd64_push_reg (code, AMD64_RDX);
965 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
966 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
969 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
971 /* Obtain the pending exception */
973 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
974 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
976 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
978 amd64_call_reg (code, AMD64_R11);
980 /* Check if it is NULL, and branch */
981 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
982 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
984 /* exc != NULL branch */
986 /* Save the exc on the stack */
987 amd64_push_reg (code, AMD64_RAX);
989 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
991 /* Obtain the original ip and clear the flag in previous_lmf */
993 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
994 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
996 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
998 amd64_call_reg (code, AMD64_R11);
1001 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
1003 /* Pop saved stuff from the stack */
1004 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
1006 /* Setup arguments for the throw trampoline */
1008 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
1009 /* The trampoline expects the caller ip to be pushed on the stack */
1010 amd64_push_reg (code, AMD64_RAX);
1012 /* Call the throw trampoline */
1014 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
1015 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1017 throw_trampoline = mono_get_throw_exception ();
1018 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1020 /* We use a jump instead of a call so we can push the original ip on the stack */
1021 amd64_jump_reg (code, AMD64_R11);
1023 /* ex == NULL branch */
1024 mono_amd64_patch (br [0], code);
1026 /* Obtain the original ip and clear the flag in previous_lmf */
1028 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1029 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1031 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1033 amd64_call_reg (code, AMD64_R11);
1034 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1036 /* Restore registers */
1037 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1038 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1039 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1040 amd64_pop_reg (code, AMD64_RDX);
1041 amd64_pop_reg (code, AMD64_RAX);
1043 /* Return to original code */
1044 amd64_jump_reg (code, AMD64_R11);
1046 g_assert ((code - start) < kMaxCodeSize);
1048 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1051 *info = mono_tramp_info_create ("throw_pending_exception", start, code - start, ji, unwind_ops);
1056 static gpointer throw_pending_exception;
1059 * Called when a thread receives an async exception while executing unmanaged code.
1060 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1061 * the return address on the stack to point to a helper routine which throws the
1065 mono_arch_notify_pending_exc (void)
1067 MonoLMF *lmf = mono_get_lmf ();
1070 /* Not yet started */
1077 if ((guint64)lmf->previous_lmf & 1)
1078 /* Already hijacked or trampoline LMF entry */
1081 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1082 lmf->rip = *(guint64*)(lmf->rsp - 8);
1083 /* Signal that lmf->rip is set */
1084 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1086 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1090 mono_amd64_get_exception_trampolines (gboolean aot)
1092 MonoTrampInfo *info;
1093 GSList *tramps = NULL;
1095 mono_arch_get_throw_pending_exception (&info, aot);
1096 tramps = g_slist_prepend (tramps, info);
1098 /* LLVM needs different throw trampolines */
1099 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1100 tramps = g_slist_prepend (tramps, info);
1102 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1103 tramps = g_slist_prepend (tramps, info);
1105 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1106 tramps = g_slist_prepend (tramps, info);
1112 mono_arch_exceptions_init (void)
1117 if (mono_aot_only) {
1118 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1119 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1120 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1121 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1122 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1123 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1124 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1126 /* Call this to avoid initialization races */
1127 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1129 tramps = mono_amd64_get_exception_trampolines (FALSE);
1130 for (l = tramps; l; l = l->next) {
1131 MonoTrampInfo *info = l->data;
1133 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1134 mono_tramp_info_register (info);
1136 g_slist_free (tramps);
1143 * The mono_arch_unwindinfo* methods are used to build and add
1144 * function table info for each emitted method from mono. On Winx64
1145 * the seh handler will not be called if the mono methods are not
1146 * added to the function table.
1148 * We should not need to add non-volatile register info to the
1149 * table since mono stores that info elsewhere. (Except for the register
1153 #define MONO_MAX_UNWIND_CODES 22
1155 typedef union _UNWIND_CODE {
1158 guchar UnwindOp : 4;
1161 gushort FrameOffset;
1162 } UNWIND_CODE, *PUNWIND_CODE;
1164 typedef struct _UNWIND_INFO {
1167 guchar SizeOfProlog;
1168 guchar CountOfCodes;
1169 guchar FrameRegister : 4;
1170 guchar FrameOffset : 4;
1171 /* custom size for mono allowing for mono allowing for*/
1172 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1173 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1174 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1175 /*UWOP_PUSH_NONVOL offset = 15-0*/
1176 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1178 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1180 * OPTIONAL ULONG ExceptionHandler;
1181 * OPTIONAL ULONG FunctionEntry;
1183 * OPTIONAL ULONG ExceptionData[]; */
1184 } UNWIND_INFO, *PUNWIND_INFO;
1188 RUNTIME_FUNCTION runtimeFunction;
1189 UNWIND_INFO unwindInfo;
1190 } MonoUnwindInfo, *PMonoUnwindInfo;
1193 mono_arch_unwindinfo_create (gpointer* monoui)
1195 PMonoUnwindInfo newunwindinfo;
1196 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1197 newunwindinfo->unwindInfo.Version = 1;
1201 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1203 PMonoUnwindInfo unwindinfo;
1204 PUNWIND_CODE unwindcode;
1207 mono_arch_unwindinfo_create (monoui);
1209 unwindinfo = (MonoUnwindInfo*)*monoui;
1211 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1212 g_error ("Larger allocation needed for the unwind information.");
1214 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1215 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1216 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1217 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1218 unwindcode->OpInfo = reg;
1220 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1221 g_error ("Adding unwind info in wrong order.");
1223 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1227 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1229 PMonoUnwindInfo unwindinfo;
1230 PUNWIND_CODE unwindcode;
1233 mono_arch_unwindinfo_create (monoui);
1235 unwindinfo = (MonoUnwindInfo*)*monoui;
1237 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1238 g_error ("Larger allocation needed for the unwind information.");
1240 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1241 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1242 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1244 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1245 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1246 unwindcode->OpInfo = reg;
1248 unwindinfo->unwindInfo.FrameRegister = reg;
1250 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1251 g_error ("Adding unwind info in wrong order.");
1253 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1257 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1259 PMonoUnwindInfo unwindinfo;
1260 PUNWIND_CODE unwindcode;
1264 mono_arch_unwindinfo_create (monoui);
1266 unwindinfo = (MonoUnwindInfo*)*monoui;
1269 g_error ("Stack allocation must be equal to or greater than 0x8.");
1273 else if (size <= 0x7FFF8)
1278 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1279 g_error ("Larger allocation needed for the unwind information.");
1281 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1282 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1284 if (codesneeded == 1) {
1285 /*The size of the allocation is
1286 (the number in the OpInfo member) times 8 plus 8*/
1287 unwindcode->OpInfo = (size - 8)/8;
1288 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1291 if (codesneeded == 3) {
1292 /*the unscaled size of the allocation is recorded
1293 in the next two slots in little-endian format*/
1294 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1296 unwindcode->OpInfo = 1;
1299 /*the size of the allocation divided by 8
1300 is recorded in the next slot*/
1301 unwindcode->FrameOffset = size/8;
1303 unwindcode->OpInfo = 0;
1306 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1309 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1311 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1312 g_error ("Adding unwind info in wrong order.");
1314 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1318 mono_arch_unwindinfo_get_size (gpointer monoui)
1320 PMonoUnwindInfo unwindinfo;
1324 unwindinfo = (MonoUnwindInfo*)monoui;
1325 return (8 + sizeof (MonoUnwindInfo)) -
1326 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1329 static PRUNTIME_FUNCTION
1330 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1334 PMonoUnwindInfo targetinfo;
1335 MonoDomain *domain = mono_domain_get ();
1337 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1341 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1343 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1345 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1347 return &targetinfo->runtimeFunction;
1351 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1353 PMonoUnwindInfo unwindinfo, targetinfo;
1355 guint64 targetlocation;
1359 unwindinfo = (MonoUnwindInfo*)*monoui;
1360 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1361 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1363 unwindinfo->runtimeFunction.EndAddress = code_size;
1364 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1366 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1368 codecount = unwindinfo->unwindInfo.CountOfCodes;
1370 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1371 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1374 g_free (unwindinfo);
1377 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1382 #if MONO_SUPPORT_TASKLETS
1383 MonoContinuationRestore
1384 mono_tasklets_arch_restore (void)
1386 static guint8* saved = NULL;
1387 guint8 *code, *start;
1388 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1389 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1393 return (MonoContinuationRestore)saved;
1394 code = start = mono_global_codeman_reserve (kMaxCodeSize);
1395 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1396 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1397 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1398 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1399 * We move cont to cont_reg since we need both rcx and rdi for the copy
1400 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1402 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1403 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1404 /* setup the copy of the stack */
1405 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1406 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1408 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1409 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1410 amd64_prefix (code, X86_REP_PREFIX);
1413 /* now restore the registers from the LMF */
1415 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1416 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, MONO_STRUCT_OFFSET (MonoLMF, rsp), 8);
1418 /* restore the lmf chain */
1419 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1420 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1422 /* state is already in rax */
1423 amd64_jump_membase (code, cont_reg, MONO_STRUCT_OFFSET (MonoContinuation, return_ip));
1424 g_assert ((code - start) <= kMaxCodeSize);
1426 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1429 return (MonoContinuationRestore)saved;
1434 * mono_arch_setup_resume_sighandler_ctx:
1436 * Setup CTX so execution continues at FUNC.
1439 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1442 * When resuming from a signal handler, the stack should be misaligned, just like right after
1445 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1446 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1447 MONO_CONTEXT_SET_IP (ctx, func);