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)
13 #if _WIN32_WINNT < 0x0501
14 /* Required for Vectored Exception Handling. */
16 #define _WIN32_WINNT 0x0501
17 #endif /* _WIN32_WINNT < 0x0501 */
23 #ifdef HAVE_UCONTEXT_H
27 #include <mono/arch/amd64/amd64-codegen.h>
28 #include <mono/metadata/appdomain.h>
29 #include <mono/metadata/tabledefs.h>
30 #include <mono/metadata/threads.h>
31 #include <mono/metadata/threads-types.h>
32 #include <mono/metadata/debug-helpers.h>
33 #include <mono/metadata/exception.h>
34 #include <mono/metadata/gc-internal.h>
35 #include <mono/metadata/mono-debug.h>
36 #include <mono/utils/mono-mmap.h>
39 #include "mini-amd64.h"
42 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
45 static MonoW32ExceptionHandler fpe_handler;
46 static MonoW32ExceptionHandler ill_handler;
47 static MonoW32ExceptionHandler segv_handler;
49 LPTOP_LEVEL_EXCEPTION_FILTER mono_old_win_toplevel_exception_filter;
50 void *mono_win_vectored_exception_handle;
51 extern gboolean mono_win_chained_exception_needs_run;
53 #define W32_SEH_HANDLE_EX(_ex) \
54 if (_ex##_handler) _ex##_handler(0, ep, sctx)
56 static LONG CALLBACK seh_unhandled_exception_filter(EXCEPTION_POINTERS* ep)
58 #ifndef MONO_CROSS_COMPILE
59 if (mono_old_win_toplevel_exception_filter) {
60 return (*mono_old_win_toplevel_exception_filter)(ep);
64 mono_handle_native_sigsegv (SIGSEGV, NULL);
66 return EXCEPTION_CONTINUE_SEARCH;
70 * Unhandled Exception Filter
71 * Top-level per-process exception handler.
73 static LONG CALLBACK seh_vectored_exception_handler(EXCEPTION_POINTERS* ep)
80 mono_win_chained_exception_needs_run = FALSE;
81 res = EXCEPTION_CONTINUE_EXECUTION;
83 er = ep->ExceptionRecord;
84 ctx = ep->ContextRecord;
85 sctx = g_malloc(sizeof(MonoContext));
87 /* Copy Win32 context to UNIX style context */
100 sctx->r15 = ctx->R15;
102 switch (er->ExceptionCode) {
103 case EXCEPTION_ACCESS_VIOLATION:
104 W32_SEH_HANDLE_EX(segv);
106 case EXCEPTION_ILLEGAL_INSTRUCTION:
107 W32_SEH_HANDLE_EX(ill);
109 case EXCEPTION_INT_DIVIDE_BY_ZERO:
110 case EXCEPTION_INT_OVERFLOW:
111 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
112 case EXCEPTION_FLT_OVERFLOW:
113 case EXCEPTION_FLT_UNDERFLOW:
114 case EXCEPTION_FLT_INEXACT_RESULT:
115 W32_SEH_HANDLE_EX(fpe);
121 if (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, G_STRUCT_OFFSET (MonoContext, rax), 8);
212 amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rcx), 8);
213 amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdx), 8);
214 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbx), 8);
215 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbp), 8);
216 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsi), 8);
217 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdi), 8);
218 //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r8), 8);
219 //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r9), 8);
220 //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r10), 8);
221 amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r12), 8);
222 amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r13), 8);
223 amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r14), 8);
224 #if !defined(__native_client_codegen__)
225 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_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, G_STRUCT_OFFSET (MonoContext, rsp), 8);
237 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_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, G_STRUCT_OFFSET (MonoContext, rbp), 8);
298 /* load callee saved regs */
299 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
300 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
301 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
302 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
303 #if !defined(__native_client_codegen__)
304 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
307 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
308 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_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;
595 frame->type = FRAME_TYPE_MANAGED;
597 unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
599 frame->unwind_info = unwind_info;
600 frame->unwind_info_len = unwind_info_len;
603 printf ("%s %p %p\n", ji->d.method->name, ji->code_start, ip);
604 mono_print_unwind_info (unwind_info, unwind_info_len);
607 regs [AMD64_RAX] = new_ctx->rax;
608 regs [AMD64_RBX] = new_ctx->rbx;
609 regs [AMD64_RCX] = new_ctx->rcx;
610 regs [AMD64_RDX] = new_ctx->rdx;
611 regs [AMD64_RBP] = new_ctx->rbp;
612 regs [AMD64_RSP] = new_ctx->rsp;
613 regs [AMD64_RSI] = new_ctx->rsi;
614 regs [AMD64_RDI] = new_ctx->rdi;
615 regs [AMD64_RIP] = new_ctx->rip;
616 regs [AMD64_R12] = new_ctx->r12;
617 regs [AMD64_R13] = new_ctx->r13;
618 regs [AMD64_R14] = new_ctx->r14;
619 regs [AMD64_R15] = new_ctx->r15;
621 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
622 (guint8*)ji->code_start + ji->code_size,
623 ip, regs, MONO_MAX_IREGS + 1,
624 save_locations, MONO_MAX_IREGS, &cfa);
626 new_ctx->rax = regs [AMD64_RAX];
627 new_ctx->rbx = regs [AMD64_RBX];
628 new_ctx->rcx = regs [AMD64_RCX];
629 new_ctx->rdx = regs [AMD64_RDX];
630 new_ctx->rbp = regs [AMD64_RBP];
631 new_ctx->rsp = regs [AMD64_RSP];
632 new_ctx->rsi = regs [AMD64_RSI];
633 new_ctx->rdi = regs [AMD64_RDI];
634 new_ctx->rip = regs [AMD64_RIP];
635 new_ctx->r12 = regs [AMD64_R12];
636 new_ctx->r13 = regs [AMD64_R13];
637 new_ctx->r14 = regs [AMD64_R14];
638 new_ctx->r15 = regs [AMD64_R15];
640 /* The CFA becomes the new SP value */
641 new_ctx->rsp = (mgreg_t)cfa;
646 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
647 /* remove any unused lmf */
648 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
651 #ifndef MONO_AMD64_NO_PUSHES
652 /* Pop arguments off the stack */
653 if (ji->has_arch_eh_info)
654 new_ctx->rsp += mono_jit_info_get_arch_eh_info (ji)->stack_size;
661 if (((guint64)(*lmf)->previous_lmf) & 2) {
663 * This LMF entry is created by the soft debug code to mark transitions to
664 * managed code done during invokes.
666 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
668 g_assert (ext->debugger_invoke);
670 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
672 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
674 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
679 if (((guint64)(*lmf)->previous_lmf) & 1) {
680 /* This LMF has the rip field set */
682 } else if ((*lmf)->rsp == 0) {
687 * The rsp field is set just before the call which transitioned to native
688 * code. Obtain the rip from the stack.
690 rip = *(guint64*)((*lmf)->rsp - sizeof(mgreg_t));
693 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
695 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
696 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
707 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
710 new_ctx->rbp = (*lmf)->rbp;
711 new_ctx->rsp = (*lmf)->rsp;
713 if (((guint64)(*lmf)->previous_lmf) & 4) {
714 MonoLMFTramp *ext = (MonoLMFTramp*)(*lmf);
716 /* Trampoline frame */
717 new_ctx->rbx = ext->regs [AMD64_RBX];
718 new_ctx->r12 = ext->regs [AMD64_R12];
719 new_ctx->r13 = ext->regs [AMD64_R13];
720 new_ctx->r14 = ext->regs [AMD64_R14];
721 new_ctx->r15 = ext->regs [AMD64_R15];
723 new_ctx->rdi = ext->regs [AMD64_RDI];
724 new_ctx->rsi = ext->regs [AMD64_RSI];
728 * The registers saved in the LMF will be restored using the normal unwind info,
729 * when the wrapper frame is processed.
742 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~7);
753 * Called by resuming from a signal handler.
756 handle_signal_exception (gpointer obj)
758 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
761 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
763 mono_handle_exception (&ctx, obj);
765 mono_restore_context (&ctx);
769 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
771 guint64 sp = ctx->rsp;
773 ctx->rdi = (guint64)user_data;
775 /* Allocate a stack frame below the red zone */
777 /* The stack should be unaligned */
781 /* Preserve the call chain to prevent crashes in the libgcc unwinder (#15969) */
782 *(guint64*)sp = ctx->rip;
785 ctx->rip = (guint64)async_cb;
789 * mono_arch_handle_exception:
791 * @ctx: saved processor state
792 * @obj: the exception object
795 mono_arch_handle_exception (void *sigctx, gpointer obj)
797 #if defined(MONO_ARCH_USE_SIGACTION)
801 * Handling the exception in the signal handler is problematic, since the original
802 * signal is disabled, and we could run arbitrary code though the debugger. So
803 * resume into the normal stack and do most work there if possible.
805 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
807 /* Pass the ctx parameter in TLS */
808 mono_arch_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
810 mctx = jit_tls->ex_ctx;
811 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
812 mono_monoctx_to_sigctx (&mctx, sigctx);
818 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
820 mono_handle_exception (&mctx, obj);
822 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
829 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
831 mono_sigctx_to_monoctx (sigctx, mctx);
835 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
837 mono_monoctx_to_sigctx (mctx, sigctx);
841 mono_arch_ip_from_context (void *sigctx)
843 #if defined(MONO_ARCH_USE_SIGACTION)
844 ucontext_t *ctx = (ucontext_t*)sigctx;
846 return (gpointer)UCONTEXT_REG_RIP (ctx);
848 MonoContext *ctx = sigctx;
849 return (gpointer)ctx->rip;
854 restore_soft_guard_pages (void)
856 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
857 if (jit_tls->stack_ovf_guard_base)
858 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
862 * this function modifies mctx so that when it is restored, it
863 * won't execcute starting at mctx.eip, but in a function that
864 * will restore the protection on the soft-guard pages and return back to
865 * continue at mctx.eip.
868 prepare_for_guard_pages (MonoContext *mctx)
871 sp = (gpointer)(mctx->rsp);
873 /* the return addr */
874 sp [0] = (gpointer)(mctx->rip);
875 mctx->rip = (guint64)restore_soft_guard_pages;
876 mctx->rsp = (guint64)sp;
880 altstack_handle_and_restore (MonoContext *ctx, gpointer obj, gboolean stack_ovf)
886 mono_handle_exception (&mctx, obj);
888 prepare_for_guard_pages (&mctx);
889 mono_restore_context (&mctx);
893 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
895 #if defined(MONO_ARCH_USE_SIGACTION)
896 MonoException *exc = NULL;
897 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
900 MonoContext *copied_ctx;
903 exc = mono_domain_get ()->stack_overflow_ex;
905 mono_handle_native_sigsegv (SIGSEGV, sigctx);
907 /* setup a call frame on the real stack so that control is returned there
908 * and exception handling can continue.
909 * The frame looks like:
913 * 128 is the size of the red zone
915 frame_size = sizeof (MonoContext) + sizeof (gpointer) * 4 + 128;
918 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
919 sp = (gpointer)((char*)sp - frame_size);
920 copied_ctx = (MonoContext*)(sp + 4);
921 /* the arguments must be aligned */
922 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
923 mono_sigctx_to_monoctx (sigctx, copied_ctx);
924 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
925 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
926 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
927 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(copied_ctx);
928 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
929 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
934 mono_amd64_get_original_ip (void)
936 MonoLMF *lmf = mono_get_lmf ();
940 /* Reset the change to previous_lmf */
941 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
947 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
949 guint8 *code, *start;
951 gpointer throw_trampoline;
952 MonoJumpInfo *ji = NULL;
953 GSList *unwind_ops = NULL;
954 const guint kMaxCodeSize = NACL_SIZE (128, 256);
956 start = code = mono_global_codeman_reserve (kMaxCodeSize);
958 /* We are in the frame of a managed method after a call */
960 * We would like to throw the pending exception in such a way that it looks to
961 * be thrown from the managed method.
964 /* Save registers which might contain the return value of the call */
965 amd64_push_reg (code, AMD64_RAX);
966 amd64_push_reg (code, AMD64_RDX);
968 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
969 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
972 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
974 /* Obtain the pending exception */
976 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
977 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
979 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
981 amd64_call_reg (code, AMD64_R11);
983 /* Check if it is NULL, and branch */
984 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
985 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
987 /* exc != NULL branch */
989 /* Save the exc on the stack */
990 amd64_push_reg (code, AMD64_RAX);
992 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
994 /* Obtain the original ip and clear the flag in previous_lmf */
996 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
997 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
999 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1001 amd64_call_reg (code, AMD64_R11);
1004 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
1006 /* Pop saved stuff from the stack */
1007 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
1009 /* Setup arguments for the throw trampoline */
1011 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
1012 /* The trampoline expects the caller ip to be pushed on the stack */
1013 amd64_push_reg (code, AMD64_RAX);
1015 /* Call the throw trampoline */
1017 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
1018 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1020 throw_trampoline = mono_get_throw_exception ();
1021 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1023 /* We use a jump instead of a call so we can push the original ip on the stack */
1024 amd64_jump_reg (code, AMD64_R11);
1026 /* ex == NULL branch */
1027 mono_amd64_patch (br [0], code);
1029 /* Obtain the original ip and clear the flag in previous_lmf */
1031 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1032 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1034 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1036 amd64_call_reg (code, AMD64_R11);
1037 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1039 /* Restore registers */
1040 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1041 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1042 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1043 amd64_pop_reg (code, AMD64_RDX);
1044 amd64_pop_reg (code, AMD64_RAX);
1046 /* Return to original code */
1047 amd64_jump_reg (code, AMD64_R11);
1049 g_assert ((code - start) < kMaxCodeSize);
1051 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1054 *info = mono_tramp_info_create ("throw_pending_exception", start, code - start, ji, unwind_ops);
1059 static gpointer throw_pending_exception;
1062 * Called when a thread receives an async exception while executing unmanaged code.
1063 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1064 * the return address on the stack to point to a helper routine which throws the
1068 mono_arch_notify_pending_exc (void)
1070 MonoLMF *lmf = mono_get_lmf ();
1073 /* Not yet started */
1080 if ((guint64)lmf->previous_lmf & 1)
1081 /* Already hijacked or trampoline LMF entry */
1084 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1085 lmf->rip = *(guint64*)(lmf->rsp - 8);
1086 /* Signal that lmf->rip is set */
1087 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1089 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1093 mono_amd64_get_exception_trampolines (gboolean aot)
1095 MonoTrampInfo *info;
1096 GSList *tramps = NULL;
1098 mono_arch_get_throw_pending_exception (&info, aot);
1099 tramps = g_slist_prepend (tramps, info);
1101 /* LLVM needs different throw trampolines */
1102 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1103 tramps = g_slist_prepend (tramps, info);
1105 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1106 tramps = g_slist_prepend (tramps, info);
1108 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1109 tramps = g_slist_prepend (tramps, info);
1115 mono_arch_exceptions_init (void)
1120 if (mono_aot_only) {
1121 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1122 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1123 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1124 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1125 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1126 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1127 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1129 /* Call this to avoid initialization races */
1130 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1132 tramps = mono_amd64_get_exception_trampolines (FALSE);
1133 for (l = tramps; l; l = l->next) {
1134 MonoTrampInfo *info = l->data;
1136 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1137 mono_tramp_info_register (info);
1139 g_slist_free (tramps);
1146 * The mono_arch_unwindinfo* methods are used to build and add
1147 * function table info for each emitted method from mono. On Winx64
1148 * the seh handler will not be called if the mono methods are not
1149 * added to the function table.
1151 * We should not need to add non-volatile register info to the
1152 * table since mono stores that info elsewhere. (Except for the register
1156 #define MONO_MAX_UNWIND_CODES 22
1158 typedef union _UNWIND_CODE {
1161 guchar UnwindOp : 4;
1164 gushort FrameOffset;
1165 } UNWIND_CODE, *PUNWIND_CODE;
1167 typedef struct _UNWIND_INFO {
1170 guchar SizeOfProlog;
1171 guchar CountOfCodes;
1172 guchar FrameRegister : 4;
1173 guchar FrameOffset : 4;
1174 /* custom size for mono allowing for mono allowing for*/
1175 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1176 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1177 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1178 /*UWOP_PUSH_NONVOL offset = 15-0*/
1179 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1181 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1183 * OPTIONAL ULONG ExceptionHandler;
1184 * OPTIONAL ULONG FunctionEntry;
1186 * OPTIONAL ULONG ExceptionData[]; */
1187 } UNWIND_INFO, *PUNWIND_INFO;
1191 RUNTIME_FUNCTION runtimeFunction;
1192 UNWIND_INFO unwindInfo;
1193 } MonoUnwindInfo, *PMonoUnwindInfo;
1196 mono_arch_unwindinfo_create (gpointer* monoui)
1198 PMonoUnwindInfo newunwindinfo;
1199 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1200 newunwindinfo->unwindInfo.Version = 1;
1204 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1206 PMonoUnwindInfo unwindinfo;
1207 PUNWIND_CODE unwindcode;
1210 mono_arch_unwindinfo_create (monoui);
1212 unwindinfo = (MonoUnwindInfo*)*monoui;
1214 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1215 g_error ("Larger allocation needed for the unwind information.");
1217 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1218 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1219 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1220 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1221 unwindcode->OpInfo = reg;
1223 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1224 g_error ("Adding unwind info in wrong order.");
1226 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1230 mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1232 PMonoUnwindInfo unwindinfo;
1233 PUNWIND_CODE unwindcode;
1236 mono_arch_unwindinfo_create (monoui);
1238 unwindinfo = (MonoUnwindInfo*)*monoui;
1240 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1241 g_error ("Larger allocation needed for the unwind information.");
1243 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1244 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1245 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1247 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1248 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1249 unwindcode->OpInfo = reg;
1251 unwindinfo->unwindInfo.FrameRegister = reg;
1253 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1254 g_error ("Adding unwind info in wrong order.");
1256 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1260 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1262 PMonoUnwindInfo unwindinfo;
1263 PUNWIND_CODE unwindcode;
1267 mono_arch_unwindinfo_create (monoui);
1269 unwindinfo = (MonoUnwindInfo*)*monoui;
1272 g_error ("Stack allocation must be equal to or greater than 0x8.");
1276 else if (size <= 0x7FFF8)
1281 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1282 g_error ("Larger allocation needed for the unwind information.");
1284 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1285 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1287 if (codesneeded == 1) {
1288 /*The size of the allocation is
1289 (the number in the OpInfo member) times 8 plus 8*/
1290 unwindcode->OpInfo = (size - 8)/8;
1291 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1294 if (codesneeded == 3) {
1295 /*the unscaled size of the allocation is recorded
1296 in the next two slots in little-endian format*/
1297 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1299 unwindcode->OpInfo = 1;
1302 /*the size of the allocation divided by 8
1303 is recorded in the next slot*/
1304 unwindcode->FrameOffset = size/8;
1306 unwindcode->OpInfo = 0;
1309 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1312 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1314 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1315 g_error ("Adding unwind info in wrong order.");
1317 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1321 mono_arch_unwindinfo_get_size (gpointer monoui)
1323 PMonoUnwindInfo unwindinfo;
1327 unwindinfo = (MonoUnwindInfo*)monoui;
1328 return (8 + sizeof (MonoUnwindInfo)) -
1329 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1332 static PRUNTIME_FUNCTION
1333 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1337 PMonoUnwindInfo targetinfo;
1338 MonoDomain *domain = mono_domain_get ();
1340 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1344 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1346 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1348 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1350 return &targetinfo->runtimeFunction;
1354 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1356 PMonoUnwindInfo unwindinfo, targetinfo;
1358 guint64 targetlocation;
1362 unwindinfo = (MonoUnwindInfo*)*monoui;
1363 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1364 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1366 unwindinfo->runtimeFunction.EndAddress = code_size;
1367 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1369 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1371 codecount = unwindinfo->unwindInfo.CountOfCodes;
1373 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1374 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1377 g_free (unwindinfo);
1380 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1385 #if MONO_SUPPORT_TASKLETS
1386 MonoContinuationRestore
1387 mono_tasklets_arch_restore (void)
1389 static guint8* saved = NULL;
1390 guint8 *code, *start;
1391 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1392 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1396 return (MonoContinuationRestore)saved;
1397 code = start = mono_global_codeman_reserve (kMaxCodeSize);
1398 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1399 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1400 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1401 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1402 * We move cont to cont_reg since we need both rcx and rdi for the copy
1403 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1405 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1406 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1407 /* setup the copy of the stack */
1408 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1409 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1411 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1412 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1413 amd64_prefix (code, X86_REP_PREFIX);
1416 /* now restore the registers from the LMF */
1417 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1418 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1419 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1420 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1421 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1422 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1423 #if !defined(__native_client_codegen__)
1424 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1427 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1428 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1430 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1432 /* restore the lmf chain */
1433 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1434 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1436 /* state is already in rax */
1437 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1438 g_assert ((code - start) <= kMaxCodeSize);
1440 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1443 return (MonoContinuationRestore)saved;
1448 * mono_arch_setup_resume_sighandler_ctx:
1450 * Setup CTX so execution continues at FUNC.
1453 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1456 * When resuming from a signal handler, the stack should be misaligned, just like right after
1459 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1460 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1461 MONO_CONTEXT_SET_IP (ctx, func);