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 #if !defined(__native_client_codegen__)
183 amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r15), 8);
186 if (mono_running_on_valgrind ()) {
187 /* Prevent 'Address 0x... is just below the stack ptr.' errors */
188 amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
189 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
190 amd64_mov_reg_reg (code, AMD64_RSP, AMD64_R8, 8);
192 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
193 /* get return address */
194 amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
197 /* jump to the saved IP */
198 amd64_jump_reg (code, AMD64_R11);
200 #if defined(__native_client_codegen__) && defined(__native_client__)
201 nacl_global_codeman_validate(&start, 256, &code);
204 mono_arch_flush_icache (start, code - start);
207 *info = mono_tramp_info_create (g_strdup_printf ("restore_context"), start, code - start, ji, unwind_ops);
213 * mono_arch_get_call_filter:
215 * Returns a pointer to a method which calls an exception filter. We
216 * also use this function to call finally handlers (we pass NULL as
217 * @exc object in this case).
220 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
226 MonoJumpInfo *ji = NULL;
227 GSList *unwind_ops = NULL;
228 const guint kMaxCodeSize = NACL_SIZE (128, 256);
230 start = code = mono_global_codeman_reserve (kMaxCodeSize);
232 /* call_filter (MonoContext *ctx, unsigned long eip) */
235 /* Alloc new frame */
236 amd64_push_reg (code, AMD64_RBP);
237 amd64_mov_reg_reg (code, AMD64_RBP, AMD64_RSP, 8);
239 /* Save callee saved regs */
241 for (i = 0; i < AMD64_NREG; ++i)
242 if (AMD64_IS_CALLEE_SAVED_REG (i)) {
243 amd64_push_reg (code, i);
249 amd64_push_reg (code, AMD64_RBP);
251 /* Make stack misaligned, the call will make it aligned again */
253 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
256 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
257 /* load callee saved regs */
258 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
259 amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
260 amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
261 amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
262 #if !defined(__native_client_codegen__)
263 amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
266 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
267 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
270 /* call the handler */
271 amd64_call_reg (code, AMD64_ARG_REG2);
274 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
277 amd64_pop_reg (code, AMD64_RBP);
279 /* Restore callee saved regs */
280 for (i = AMD64_NREG; i >= 0; --i)
281 if (AMD64_IS_CALLEE_SAVED_REG (i))
282 amd64_pop_reg (code, i);
287 g_assert ((code - start) < kMaxCodeSize);
289 #if defined(__native_client_codegen__) && defined(__native_client__)
290 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
293 mono_arch_flush_icache (start, code - start);
296 *info = mono_tramp_info_create (g_strdup_printf ("call_filter"), start, code - start, ji, unwind_ops);
302 * The first few arguments are dummy, to force the other arguments to be passed on
303 * the stack, this avoids overwriting the argument registers in the throw trampoline.
306 mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
307 guint64 dummy5, guint64 dummy6,
308 mgreg_t *regs, mgreg_t rip,
309 MonoObject *exc, gboolean rethrow)
311 static void (*restore_context) (MonoContext *);
314 if (!restore_context)
315 restore_context = mono_get_restore_context ();
317 ctx.rsp = regs [AMD64_RSP];
319 ctx.rbx = regs [AMD64_RBX];
320 ctx.rbp = regs [AMD64_RBP];
321 ctx.r12 = regs [AMD64_R12];
322 ctx.r13 = regs [AMD64_R13];
323 ctx.r14 = regs [AMD64_R14];
324 ctx.r15 = regs [AMD64_R15];
325 ctx.rdi = regs [AMD64_RDI];
326 ctx.rsi = regs [AMD64_RSI];
327 ctx.rax = regs [AMD64_RAX];
328 ctx.rcx = regs [AMD64_RCX];
329 ctx.rdx = regs [AMD64_RDX];
331 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
332 MonoException *mono_ex = (MonoException*)exc;
334 mono_ex->stack_trace = NULL;
337 if (mono_debug_using_mono_debugger ()) {
338 guint8 buf [16], *code;
340 mono_breakpoint_clean_code (NULL, (gpointer)rip, 8, buf, sizeof (buf));
343 if (buf [3] == 0xe8) {
344 MonoContext ctx_cp = ctx;
345 ctx_cp.rip = rip - 5;
347 if (mono_debugger_handle_exception (&ctx_cp, exc)) {
348 restore_context (&ctx_cp);
349 g_assert_not_reached ();
354 /* adjust eip so that it point into the call instruction */
357 mono_handle_exception (&ctx, exc, (gpointer)rip, FALSE);
358 restore_context (&ctx);
360 g_assert_not_reached ();
364 mono_amd64_throw_corlib_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
365 guint64 dummy5, guint64 dummy6,
366 mgreg_t *regs, mgreg_t rip,
367 guint32 ex_token_index, gint64 pc_offset)
369 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
372 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
376 /* Negate the ip adjustment done in mono_amd64_throw_exception () */
379 mono_amd64_throw_exception (dummy1, dummy2, dummy3, dummy4, dummy5, dummy6, regs, rip, (MonoObject*)ex, FALSE);
383 mono_amd64_resume_unwind (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
384 guint64 dummy5, guint64 dummy6,
385 mgreg_t *regs, mgreg_t rip,
386 guint32 dummy7, gint64 dummy8)
388 /* Only the register parameters are valid */
391 ctx.rsp = regs [AMD64_RSP];
393 ctx.rbx = regs [AMD64_RBX];
394 ctx.rbp = regs [AMD64_RBP];
395 ctx.r12 = regs [AMD64_R12];
396 ctx.r13 = regs [AMD64_R13];
397 ctx.r14 = regs [AMD64_R14];
398 ctx.r15 = regs [AMD64_R15];
399 ctx.rdi = regs [AMD64_RDI];
400 ctx.rsi = regs [AMD64_RSI];
401 ctx.rax = regs [AMD64_RAX];
402 ctx.rcx = regs [AMD64_RCX];
403 ctx.rdx = regs [AMD64_RDX];
405 mono_resume_unwind (&ctx);
409 * get_throw_trampoline:
411 * Generate a call to mono_amd64_throw_exception/
412 * mono_amd64_throw_corlib_exception.
415 get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
419 MonoJumpInfo *ji = NULL;
420 GSList *unwind_ops = NULL;
421 int i, stack_size, arg_offsets [16], regs_offset;
422 const guint kMaxCodeSize = NACL_SIZE (256, 512);
424 start = code = mono_global_codeman_reserve (kMaxCodeSize);
426 /* The stack is unaligned on entry */
427 stack_size = 192 + 8;
432 unwind_ops = mono_arch_get_cie_program ();
435 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
437 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
440 * To hide linux/windows calling convention differences, we pass all arguments on
441 * the stack by passing 6 dummy values in registers.
445 arg_offsets [1] = sizeof (gpointer);
446 arg_offsets [2] = sizeof (gpointer) * 2;
447 arg_offsets [3] = sizeof (gpointer) * 3;
448 regs_offset = sizeof (gpointer) * 4;
451 for (i = 0; i < AMD64_NREG; ++i)
453 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof (gpointer)), i, 8);
455 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof (gpointer));
456 amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof (gpointer)), X86_EAX, 8);
457 /* Set arg1 == regs */
458 amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, regs_offset);
459 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, 8);
460 /* Set arg2 == eip */
462 amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
464 amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, 8);
465 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_RAX, 8);
466 /* Set arg3 == exc/ex_token_index */
468 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, 8);
470 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG1, 8);
471 /* Set arg4 == rethrow/pc offset */
473 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], 0, 8);
475 amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [3], AMD64_ARG_REG2, 8);
478 * The caller is LLVM code which passes the absolute address not a pc offset,
479 * so compensate by passing 0 as 'rip' and passing the negated abs address as
482 amd64_neg_membase (code, AMD64_RSP, arg_offsets [3]);
484 amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [3], rethrow, 8);
488 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");
489 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
491 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));
493 amd64_call_reg (code, AMD64_R11);
494 amd64_breakpoint (code);
496 mono_arch_flush_icache (start, code - start);
498 g_assert ((code - start) < kMaxCodeSize);
500 #if defined(__native_client_codegen__) && defined(__native_client__)
501 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
505 *info = mono_tramp_info_create (g_strdup (tramp_name), start, code - start, ji, unwind_ops);
511 * mono_arch_get_throw_exception:
513 * Returns a function pointer which can be used to raise
514 * exceptions. The returned function has the following
515 * signature: void (*func) (MonoException *exc);
519 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
521 return get_throw_trampoline (info, FALSE, FALSE, FALSE, FALSE, "throw_exception", aot);
525 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
527 return get_throw_trampoline (info, TRUE, FALSE, FALSE, FALSE, "rethrow_exception", aot);
531 * mono_arch_get_throw_corlib_exception:
533 * Returns a function pointer which can be used to raise
534 * corlib exceptions. The returned function has the following
535 * signature: void (*func) (guint32 ex_token, guint32 offset);
536 * Here, offset is the offset which needs to be substracted from the caller IP
537 * to get the IP of the throw. Passing the offset has the advantage that it
538 * needs no relocations in the caller.
541 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
543 return get_throw_trampoline (info, FALSE, TRUE, FALSE, FALSE, "throw_corlib_exception", aot);
547 * mono_arch_find_jit_info:
549 * This function is used to gather information from @ctx, and store it in @frame_info.
550 * It unwinds one stack frame, and stores the resulting context into @new_ctx. @lmf
551 * is modified if needed.
552 * Returns TRUE on success, FALSE otherwise.
555 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
556 MonoJitInfo *ji, MonoContext *ctx,
557 MonoContext *new_ctx, MonoLMF **lmf,
558 StackFrameInfo *frame)
560 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
562 memset (frame, 0, sizeof (StackFrameInfo));
564 frame->managed = FALSE;
569 mgreg_t regs [MONO_MAX_IREGS + 1];
571 guint32 unwind_info_len;
574 frame->type = FRAME_TYPE_MANAGED;
576 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
577 frame->managed = TRUE;
580 unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
582 unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
584 regs [AMD64_RAX] = new_ctx->rax;
585 regs [AMD64_RBX] = new_ctx->rbx;
586 regs [AMD64_RCX] = new_ctx->rcx;
587 regs [AMD64_RDX] = new_ctx->rdx;
588 regs [AMD64_RBP] = new_ctx->rbp;
589 regs [AMD64_RSP] = new_ctx->rsp;
590 regs [AMD64_RSI] = new_ctx->rsi;
591 regs [AMD64_RDI] = new_ctx->rdi;
592 regs [AMD64_RIP] = new_ctx->rip;
593 regs [AMD64_R12] = new_ctx->r12;
594 regs [AMD64_R13] = new_ctx->r13;
595 regs [AMD64_R14] = new_ctx->r14;
596 regs [AMD64_R15] = new_ctx->r15;
598 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
599 (guint8*)ji->code_start + ji->code_size,
600 ip, regs, MONO_MAX_IREGS + 1, &cfa);
602 new_ctx->rax = regs [AMD64_RAX];
603 new_ctx->rbx = regs [AMD64_RBX];
604 new_ctx->rcx = regs [AMD64_RCX];
605 new_ctx->rdx = regs [AMD64_RDX];
606 new_ctx->rbp = regs [AMD64_RBP];
607 new_ctx->rsp = regs [AMD64_RSP];
608 new_ctx->rsi = regs [AMD64_RSI];
609 new_ctx->rdi = regs [AMD64_RDI];
610 new_ctx->rip = regs [AMD64_RIP];
611 new_ctx->r12 = regs [AMD64_R12];
612 new_ctx->r13 = regs [AMD64_R13];
613 new_ctx->r14 = regs [AMD64_R14];
614 new_ctx->r15 = regs [AMD64_R15];
616 /* The CFA becomes the new SP value */
617 new_ctx->rsp = (mgreg_t)cfa;
622 if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
623 /* remove any unused lmf */
624 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
627 #ifndef MONO_AMD64_NO_PUSHES
628 /* Pop arguments off the stack */
630 MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
632 guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (ji->method), mono_method_signature (ji->method)->param_count, arg_info);
633 new_ctx->rsp += stack_to_pop;
641 if (((guint64)(*lmf)->previous_lmf) & 2) {
643 * This LMF entry is created by the soft debug code to mark transitions to
644 * managed code done during invokes.
646 MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
648 g_assert (ext->debugger_invoke);
650 memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
652 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
654 frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
659 if (((guint64)(*lmf)->previous_lmf) & 1) {
660 /* This LMF has the rip field set */
662 } else if ((*lmf)->rsp == 0) {
667 * The rsp field is set just before the call which transitioned to native
668 * code. Obtain the rip from the stack.
670 rip = *(guint64*)((*lmf)->rsp - SIZEOF_REGISTER);
673 ji = mini_jit_info_table_find (domain, (gpointer)rip, NULL);
675 * FIXME: ji == NULL can happen when a managed-to-native wrapper is interrupted
676 * in the soft debugger suspend code, since (*lmf)->rsp no longer points to the
687 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
690 new_ctx->rbp = (*lmf)->rbp;
691 new_ctx->rsp = (*lmf)->rsp;
693 new_ctx->rbx = (*lmf)->rbx;
694 new_ctx->r12 = (*lmf)->r12;
695 new_ctx->r13 = (*lmf)->r13;
696 new_ctx->r14 = (*lmf)->r14;
697 new_ctx->r15 = (*lmf)->r15;
699 new_ctx->rdi = (*lmf)->rdi;
700 new_ctx->rsi = (*lmf)->rsi;
703 *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~3);
714 * Called by resuming from a signal handler.
717 handle_signal_exception (gpointer obj, gboolean test_only)
719 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
721 static void (*restore_context) (MonoContext *);
723 if (!restore_context)
724 restore_context = mono_get_restore_context ();
726 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
728 if (mono_debugger_handle_exception (&ctx, (MonoObject *)obj))
731 mono_handle_exception (&ctx, obj, MONO_CONTEXT_GET_IP (&ctx), test_only);
733 restore_context (&ctx);
737 * mono_arch_handle_exception:
739 * @ctx: saved processor state
740 * @obj: the exception object
743 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
745 #if defined(MONO_ARCH_USE_SIGACTION)
746 ucontext_t *ctx = (ucontext_t*)sigctx;
749 * Handling the exception in the signal handler is problematic, since the original
750 * signal is disabled, and we could run arbitrary code though the debugger. So
751 * resume into the normal stack and do most work there if possible.
753 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
754 guint64 sp = UCONTEXT_REG_RSP (ctx);
756 /* Pass the ctx parameter in TLS */
757 mono_arch_sigctx_to_monoctx (ctx, &jit_tls->ex_ctx);
758 /* The others in registers */
759 UCONTEXT_REG_RDI (ctx) = (guint64)obj;
760 UCONTEXT_REG_RSI (ctx) = test_only;
762 /* Allocate a stack frame below the red zone */
764 /* The stack should be unaligned */
767 UCONTEXT_REG_RSP (ctx) = sp;
769 UCONTEXT_REG_RIP (ctx) = (guint64)handle_signal_exception;
775 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
777 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
780 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
782 mono_arch_monoctx_to_sigctx (&mctx, sigctx);
789 mono_arch_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
791 #if defined(__native_client_codegen__) || defined(__native_client__)
792 printf("WARNING: mono_arch_sigctx_to_monoctx() called!\n");
795 #if defined(MONO_ARCH_USE_SIGACTION)
796 ucontext_t *ctx = (ucontext_t*)sigctx;
798 mctx->rax = UCONTEXT_REG_RAX (ctx);
799 mctx->rbx = UCONTEXT_REG_RBX (ctx);
800 mctx->rcx = UCONTEXT_REG_RCX (ctx);
801 mctx->rdx = UCONTEXT_REG_RDX (ctx);
802 mctx->rbp = UCONTEXT_REG_RBP (ctx);
803 mctx->rsp = UCONTEXT_REG_RSP (ctx);
804 mctx->rsi = UCONTEXT_REG_RSI (ctx);
805 mctx->rdi = UCONTEXT_REG_RDI (ctx);
806 mctx->rip = UCONTEXT_REG_RIP (ctx);
807 mctx->r12 = UCONTEXT_REG_R12 (ctx);
808 mctx->r13 = UCONTEXT_REG_R13 (ctx);
809 mctx->r14 = UCONTEXT_REG_R14 (ctx);
810 mctx->r15 = UCONTEXT_REG_R15 (ctx);
812 MonoContext *ctx = (MonoContext *)sigctx;
814 mctx->rax = ctx->rax;
815 mctx->rbx = ctx->rbx;
816 mctx->rcx = ctx->rcx;
817 mctx->rdx = ctx->rdx;
818 mctx->rbp = ctx->rbp;
819 mctx->rsp = ctx->rsp;
820 mctx->rsi = ctx->rsi;
821 mctx->rdi = ctx->rdi;
822 mctx->rip = ctx->rip;
823 mctx->r12 = ctx->r12;
824 mctx->r13 = ctx->r13;
825 mctx->r14 = ctx->r14;
826 mctx->r15 = ctx->r15;
831 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
833 #if defined(__native_client__) || defined(__native_client_codegen__)
834 printf("WARNING: mono_arch_monoctx_to_sigctx() called!\n");
837 #if defined(MONO_ARCH_USE_SIGACTION)
838 ucontext_t *ctx = (ucontext_t*)sigctx;
840 UCONTEXT_REG_RAX (ctx) = mctx->rax;
841 UCONTEXT_REG_RBX (ctx) = mctx->rbx;
842 UCONTEXT_REG_RCX (ctx) = mctx->rcx;
843 UCONTEXT_REG_RDX (ctx) = mctx->rdx;
844 UCONTEXT_REG_RBP (ctx) = mctx->rbp;
845 UCONTEXT_REG_RSP (ctx) = mctx->rsp;
846 UCONTEXT_REG_RSI (ctx) = mctx->rsi;
847 UCONTEXT_REG_RDI (ctx) = mctx->rdi;
848 UCONTEXT_REG_RIP (ctx) = mctx->rip;
849 UCONTEXT_REG_R12 (ctx) = mctx->r12;
850 UCONTEXT_REG_R13 (ctx) = mctx->r13;
851 UCONTEXT_REG_R14 (ctx) = mctx->r14;
852 UCONTEXT_REG_R15 (ctx) = mctx->r15;
854 MonoContext *ctx = (MonoContext *)sigctx;
856 ctx->rax = mctx->rax;
857 ctx->rbx = mctx->rbx;
858 ctx->rcx = mctx->rcx;
859 ctx->rdx = mctx->rdx;
860 ctx->rbp = mctx->rbp;
861 ctx->rsp = mctx->rsp;
862 ctx->rsi = mctx->rsi;
863 ctx->rdi = mctx->rdi;
864 ctx->rip = mctx->rip;
865 ctx->r12 = mctx->r12;
866 ctx->r13 = mctx->r13;
867 ctx->r14 = mctx->r14;
868 ctx->r15 = mctx->r15;
873 mono_arch_ip_from_context (void *sigctx)
875 #if defined(MONO_ARCH_USE_SIGACTION)
876 ucontext_t *ctx = (ucontext_t*)sigctx;
878 return (gpointer)UCONTEXT_REG_RIP (ctx);
880 MonoContext *ctx = sigctx;
881 return (gpointer)ctx->rip;
886 restore_soft_guard_pages (void)
888 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
889 if (jit_tls->stack_ovf_guard_base)
890 mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
894 * this function modifies mctx so that when it is restored, it
895 * won't execcute starting at mctx.eip, but in a function that
896 * will restore the protection on the soft-guard pages and return back to
897 * continue at mctx.eip.
900 prepare_for_guard_pages (MonoContext *mctx)
903 sp = (gpointer)(mctx->rsp);
905 /* the return addr */
906 sp [0] = (gpointer)(mctx->rip);
907 mctx->rip = (guint64)restore_soft_guard_pages;
908 mctx->rsp = (guint64)sp;
912 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
914 void (*restore_context) (MonoContext *);
917 restore_context = mono_get_restore_context ();
918 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
920 if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
922 prepare_for_guard_pages (&mctx);
923 restore_context (&mctx);
926 mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
928 prepare_for_guard_pages (&mctx);
929 restore_context (&mctx);
933 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
935 #if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_GREGS)
936 MonoException *exc = NULL;
937 ucontext_t *ctx = (ucontext_t*)sigctx;
938 MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_RIP (sigctx), NULL);
943 exc = mono_domain_get ()->stack_overflow_ex;
945 mono_handle_native_sigsegv (SIGSEGV, sigctx);
947 /* setup a call frame on the real stack so that control is returned there
948 * and exception handling can continue.
949 * The frame looks like:
953 * 128 is the size of the red zone
955 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4 + 128;
958 sp = (gpointer)(UCONTEXT_REG_RSP (sigctx) & ~15);
959 sp = (gpointer)((char*)sp - frame_size);
960 /* the arguments must be aligned */
961 sp [-1] = (gpointer)UCONTEXT_REG_RIP (sigctx);
962 /* may need to adjust pointers in the new struct copy, depending on the OS */
963 memcpy (sp + 4, ctx, sizeof (ucontext_t));
964 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
965 UCONTEXT_REG_RIP (sigctx) = (unsigned long)altstack_handle_and_restore;
966 UCONTEXT_REG_RSP (sigctx) = (unsigned long)(sp - 1);
967 UCONTEXT_REG_RDI (sigctx) = (unsigned long)(sp + 4);
968 UCONTEXT_REG_RSI (sigctx) = (guint64)exc;
969 UCONTEXT_REG_RDX (sigctx) = stack_ovf;
974 mono_amd64_get_original_ip (void)
976 MonoLMF *lmf = mono_get_lmf ();
980 /* Reset the change to previous_lmf */
981 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
987 mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
989 guint8 *code, *start;
991 gpointer throw_trampoline;
992 MonoJumpInfo *ji = NULL;
993 GSList *unwind_ops = NULL;
994 const guint kMaxCodeSize = NACL_SIZE (128, 256);
996 start = code = mono_global_codeman_reserve (kMaxCodeSize);
998 /* We are in the frame of a managed method after a call */
1000 * We would like to throw the pending exception in such a way that it looks to
1001 * be thrown from the managed method.
1004 /* Save registers which might contain the return value of the call */
1005 amd64_push_reg (code, AMD64_RAX);
1006 amd64_push_reg (code, AMD64_RDX);
1008 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1009 amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
1012 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1014 /* Obtain the pending exception */
1016 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
1017 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1019 amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
1021 amd64_call_reg (code, AMD64_R11);
1023 /* Check if it is NULL, and branch */
1024 amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
1025 br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
1027 /* exc != NULL branch */
1029 /* Save the exc on the stack */
1030 amd64_push_reg (code, AMD64_RAX);
1032 amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
1034 /* Obtain the original ip and clear the flag in previous_lmf */
1036 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1037 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1039 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1041 amd64_call_reg (code, AMD64_R11);
1044 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
1046 /* Pop saved stuff from the stack */
1047 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
1049 /* Setup arguments for the throw trampoline */
1051 amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
1052 /* The trampoline expects the caller ip to be pushed on the stack */
1053 amd64_push_reg (code, AMD64_RAX);
1055 /* Call the throw trampoline */
1057 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
1058 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1060 throw_trampoline = mono_get_throw_exception ();
1061 amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
1063 /* We use a jump instead of a call so we can push the original ip on the stack */
1064 amd64_jump_reg (code, AMD64_R11);
1066 /* ex == NULL branch */
1067 mono_amd64_patch (br [0], code);
1069 /* Obtain the original ip and clear the flag in previous_lmf */
1071 ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
1072 amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
1074 amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
1076 amd64_call_reg (code, AMD64_R11);
1077 amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
1079 /* Restore registers */
1080 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1081 amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
1082 amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
1083 amd64_pop_reg (code, AMD64_RDX);
1084 amd64_pop_reg (code, AMD64_RAX);
1086 /* Return to original code */
1087 amd64_jump_reg (code, AMD64_R11);
1089 g_assert ((code - start) < kMaxCodeSize);
1091 #if defined(__native_client_codegen__) && defined(__native_client__)
1092 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1096 *info = mono_tramp_info_create (g_strdup_printf ("throw_pending_exception"), start, code - start, ji, unwind_ops);
1101 static gpointer throw_pending_exception;
1104 * Called when a thread receives an async exception while executing unmanaged code.
1105 * Instead of checking for this exception in the managed-to-native wrapper, we hijack
1106 * the return address on the stack to point to a helper routine which throws the
1110 mono_arch_notify_pending_exc (void)
1112 MonoLMF *lmf = mono_get_lmf ();
1115 /* Not yet started */
1122 if ((guint64)lmf->previous_lmf & 1)
1123 /* Already hijacked or trampoline LMF entry */
1126 /* lmf->rsp is set just before making the call which transitions to unmanaged code */
1127 lmf->rip = *(guint64*)(lmf->rsp - 8);
1128 /* Signal that lmf->rip is set */
1129 lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
1131 *(gpointer*)(lmf->rsp - 8) = throw_pending_exception;
1135 mono_amd64_get_exception_trampolines (gboolean aot)
1137 MonoTrampInfo *info;
1138 GSList *tramps = NULL;
1140 mono_arch_get_throw_pending_exception (&info, aot);
1141 tramps = g_slist_prepend (tramps, info);
1143 /* LLVM needs different throw trampolines */
1144 get_throw_trampoline (&info, FALSE, TRUE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", aot);
1145 tramps = g_slist_prepend (tramps, info);
1147 get_throw_trampoline (&info, FALSE, TRUE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", aot);
1148 tramps = g_slist_prepend (tramps, info);
1150 get_throw_trampoline (&info, FALSE, TRUE, TRUE, TRUE, "llvm_resume_unwind_trampoline", FALSE);
1151 tramps = g_slist_prepend (tramps, info);
1157 mono_arch_exceptions_init (void)
1162 if (mono_aot_only) {
1163 throw_pending_exception = mono_aot_get_trampoline ("throw_pending_exception");
1164 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
1165 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
1166 tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
1167 mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
1168 tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
1169 mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
1171 /* Call this to avoid initialization races */
1172 throw_pending_exception = mono_arch_get_throw_pending_exception (NULL, FALSE);
1174 tramps = mono_amd64_get_exception_trampolines (FALSE);
1175 for (l = tramps; l; l = l->next) {
1176 MonoTrampInfo *info = l->data;
1178 mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
1179 mono_save_trampoline_xdebug_info (info);
1180 mono_tramp_info_free (info);
1182 g_slist_free (tramps);
1189 * The mono_arch_unwindinfo* methods are used to build and add
1190 * function table info for each emitted method from mono. On Winx64
1191 * the seh handler will not be called if the mono methods are not
1192 * added to the function table.
1194 * We should not need to add non-volatile register info to the
1195 * table since mono stores that info elsewhere. (Except for the register
1199 #define MONO_MAX_UNWIND_CODES 22
1201 typedef union _UNWIND_CODE {
1204 guchar UnwindOp : 4;
1207 gushort FrameOffset;
1208 } UNWIND_CODE, *PUNWIND_CODE;
1210 typedef struct _UNWIND_INFO {
1213 guchar SizeOfProlog;
1214 guchar CountOfCodes;
1215 guchar FrameRegister : 4;
1216 guchar FrameOffset : 4;
1217 /* custom size for mono allowing for mono allowing for*/
1218 /*UWOP_PUSH_NONVOL ebp offset = 21*/
1219 /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
1220 /*UWOP_SET_FPREG : requires 2 offset = 17*/
1221 /*UWOP_PUSH_NONVOL offset = 15-0*/
1222 UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
1224 /* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
1226 * OPTIONAL ULONG ExceptionHandler;
1227 * OPTIONAL ULONG FunctionEntry;
1229 * OPTIONAL ULONG ExceptionData[]; */
1230 } UNWIND_INFO, *PUNWIND_INFO;
1234 RUNTIME_FUNCTION runtimeFunction;
1235 UNWIND_INFO unwindInfo;
1236 } MonoUnwindInfo, *PMonoUnwindInfo;
1239 mono_arch_unwindinfo_create (gpointer* monoui)
1241 PMonoUnwindInfo newunwindinfo;
1242 *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
1243 newunwindinfo->unwindInfo.Version = 1;
1247 mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1249 PMonoUnwindInfo unwindinfo;
1250 PUNWIND_CODE unwindcode;
1253 mono_arch_unwindinfo_create (monoui);
1255 unwindinfo = (MonoUnwindInfo*)*monoui;
1257 if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
1258 g_error ("Larger allocation needed for the unwind information.");
1260 codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
1261 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1262 unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
1263 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1264 unwindcode->OpInfo = 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_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
1275 PMonoUnwindInfo unwindinfo;
1276 PUNWIND_CODE unwindcode;
1279 mono_arch_unwindinfo_create (monoui);
1281 unwindinfo = (MonoUnwindInfo*)*monoui;
1283 if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
1284 g_error ("Larger allocation needed for the unwind information.");
1286 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
1287 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1288 unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
1290 unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
1291 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1292 unwindcode->OpInfo = reg;
1294 unwindinfo->unwindInfo.FrameRegister = reg;
1296 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1297 g_error ("Adding unwind info in wrong order.");
1299 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1303 mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
1305 PMonoUnwindInfo unwindinfo;
1306 PUNWIND_CODE unwindcode;
1310 mono_arch_unwindinfo_create (monoui);
1312 unwindinfo = (MonoUnwindInfo*)*monoui;
1315 g_error ("Stack allocation must be equal to or greater than 0x8.");
1319 else if (size <= 0x7FFF8)
1324 if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
1325 g_error ("Larger allocation needed for the unwind information.");
1327 codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
1328 unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
1330 if (codesneeded == 1) {
1331 /*The size of the allocation is
1332 (the number in the OpInfo member) times 8 plus 8*/
1333 unwindcode->OpInfo = (size - 8)/8;
1334 unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
1337 if (codesneeded == 3) {
1338 /*the unscaled size of the allocation is recorded
1339 in the next two slots in little-endian format*/
1340 *((unsigned int*)(&unwindcode->FrameOffset)) = size;
1342 unwindcode->OpInfo = 1;
1345 /*the size of the allocation divided by 8
1346 is recorded in the next slot*/
1347 unwindcode->FrameOffset = size/8;
1349 unwindcode->OpInfo = 0;
1352 unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
1355 unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
1357 if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
1358 g_error ("Adding unwind info in wrong order.");
1360 unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
1364 mono_arch_unwindinfo_get_size (gpointer monoui)
1366 PMonoUnwindInfo unwindinfo;
1370 unwindinfo = (MonoUnwindInfo*)monoui;
1371 return (8 + sizeof (MonoUnwindInfo)) -
1372 (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
1376 MONO_GET_RUNTIME_FUNCTION_CALLBACK ( DWORD64 ControlPc, IN PVOID Context )
1380 PMonoUnwindInfo targetinfo;
1381 MonoDomain *domain = mono_domain_get ();
1383 ji = mini_jit_info_table_find (domain, (char*)ControlPc, NULL);
1387 pos = (guint64)(((char*)ji->code_start) + ji->code_size);
1389 targetinfo = (PMonoUnwindInfo)ALIGN_TO (pos, 8);
1391 targetinfo->runtimeFunction.UnwindData = ((DWORD64)&targetinfo->unwindInfo) - ((DWORD64)Context);
1393 return &targetinfo->runtimeFunction;
1397 mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
1399 PMonoUnwindInfo unwindinfo, targetinfo;
1401 guint64 targetlocation;
1405 unwindinfo = (MonoUnwindInfo*)*monoui;
1406 targetlocation = (guint64)&(((guchar*)code)[code_size]);
1407 targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
1409 unwindinfo->runtimeFunction.EndAddress = code_size;
1410 unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
1412 memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
1414 codecount = unwindinfo->unwindInfo.CountOfCodes;
1416 memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
1417 sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
1420 g_free (unwindinfo);
1423 RtlInstallFunctionTableCallback (((DWORD64)code) | 0x3, (DWORD64)code, code_size, MONO_GET_RUNTIME_FUNCTION_CALLBACK, code, NULL);
1428 #if MONO_SUPPORT_TASKLETS
1429 MonoContinuationRestore
1430 mono_tasklets_arch_restore (void)
1432 static guint8* saved = NULL;
1433 guint8 *code, *start;
1434 int cont_reg = AMD64_R9; /* register usable on both call conventions */
1435 const guint kMaxCodeSize = NACL_SIZE (64, 128);
1439 return (MonoContinuationRestore)saved;
1440 code = start = mono_global_codeman_reserve (kMaxCodeSize);
1441 /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
1442 /* cont is in AMD64_ARG_REG1 ($rcx or $rdi)
1443 * state is in AMD64_ARG_REG2 ($rdx or $rsi)
1444 * lmf_addr is in AMD64_ARG_REG3 ($r8 or $rdx)
1445 * We move cont to cont_reg since we need both rcx and rdi for the copy
1446 * state is moved to $rax so it's setup as the return value and we can overwrite $rsi
1448 amd64_mov_reg_reg (code, cont_reg, MONO_AMD64_ARG_REG1, 8);
1449 amd64_mov_reg_reg (code, AMD64_RAX, MONO_AMD64_ARG_REG2, 8);
1450 /* setup the copy of the stack */
1451 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), sizeof (int));
1452 amd64_shift_reg_imm (code, X86_SHR, AMD64_RCX, 3);
1454 amd64_mov_reg_membase (code, AMD64_RSI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, saved_stack), sizeof (gpointer));
1455 amd64_mov_reg_membase (code, AMD64_RDI, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_sp), sizeof (gpointer));
1456 amd64_prefix (code, X86_REP_PREFIX);
1459 /* now restore the registers from the LMF */
1460 amd64_mov_reg_membase (code, AMD64_RCX, cont_reg, G_STRUCT_OFFSET (MonoContinuation, lmf), 8);
1461 amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbx), 8);
1462 amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rbp), 8);
1463 amd64_mov_reg_membase (code, AMD64_R12, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r12), 8);
1464 amd64_mov_reg_membase (code, AMD64_R13, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r13), 8);
1465 amd64_mov_reg_membase (code, AMD64_R14, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r14), 8);
1466 #if !defined(__native_client_codegen__)
1467 amd64_mov_reg_membase (code, AMD64_R15, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, r15), 8);
1470 amd64_mov_reg_membase (code, AMD64_RDI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rdi), 8);
1471 amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsi), 8);
1473 amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RCX, G_STRUCT_OFFSET (MonoLMF, rsp), 8);
1475 /* restore the lmf chain */
1476 /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
1477 x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
1479 /* state is already in rax */
1480 amd64_jump_membase (code, cont_reg, G_STRUCT_OFFSET (MonoContinuation, return_ip));
1481 g_assert ((code - start) <= kMaxCodeSize);
1482 #if defined(__native_client_codegen__) && defined(__native_client__)
1483 nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
1486 return (MonoContinuationRestore)saved;
1491 * mono_arch_setup_resume_sighandler_ctx:
1493 * Setup CTX so execution continues at FUNC.
1496 mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
1499 * When resuming from a signal handler, the stack should be misaligned, just like right after
1502 if ((((guint64)MONO_CONTEXT_GET_SP (ctx)) % 16) == 0)
1503 MONO_CONTEXT_SET_SP (ctx, (guint64)MONO_CONTEXT_GET_SP (ctx) - 8);
1504 MONO_CONTEXT_SET_IP (ctx, func);