/*
- * exception.c: exception support
+ * exceptions-x86.c: exception support for x86
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
#include <mono/metadata/threads.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/exception.h>
+#include <mono/metadata/gc-internal.h>
#include <mono/metadata/mono-debug.h>
#include "mini.h"
#include "mini-x86.h"
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
-# define SC_EAX sc_eax
-# define SC_EBX sc_ebx
-# define SC_ECX sc_ecx
-# define SC_EDX sc_edx
-# define SC_EBP sc_ebp
-# define SC_EIP sc_eip
-# define SC_ESP sc_esp
-# define SC_EDI sc_edi
-# define SC_ESI sc_esi
-#else
-# define SC_EAX eax
-# define SC_EBX ebx
-# define SC_ECX ecx
-# define SC_EDX edx
-# define SC_EBP ebp
-# define SC_EIP eip
-# define SC_ESP esp
-# define SC_EDI edi
-# define SC_ESI esi
-#endif
+#ifdef PLATFORM_WIN32
+static MonoW32ExceptionHandler fpe_handler;
+static MonoW32ExceptionHandler ill_handler;
+static MonoW32ExceptionHandler segv_handler;
+
+static LPTOP_LEVEL_EXCEPTION_FILTER old_handler;
+
+#define W32_SEH_HANDLE_EX(_ex) \
+ if (_ex##_handler) _ex##_handler((int)sctx)
+
+/*
+ * Unhandled Exception Filter
+ * Top-level per-process exception handler.
+ */
+LONG CALLBACK seh_handler(EXCEPTION_POINTERS* ep)
+{
+ EXCEPTION_RECORD* er;
+ CONTEXT* ctx;
+ struct sigcontext* sctx;
+ LONG res;
+
+ res = EXCEPTION_CONTINUE_EXECUTION;
+
+ er = ep->ExceptionRecord;
+ ctx = ep->ContextRecord;
+ sctx = g_malloc(sizeof(struct sigcontext));
+
+ /* Copy Win32 context to UNIX style context */
+ sctx->eax = ctx->Eax;
+ sctx->ebx = ctx->Ebx;
+ sctx->ecx = ctx->Ecx;
+ sctx->edx = ctx->Edx;
+ sctx->ebp = ctx->Ebp;
+ sctx->esp = ctx->Esp;
+ sctx->esi = ctx->Esi;
+ sctx->edi = ctx->Edi;
+ sctx->eip = ctx->Eip;
+
+ switch (er->ExceptionCode) {
+ case EXCEPTION_ACCESS_VIOLATION:
+ W32_SEH_HANDLE_EX(segv);
+ break;
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ W32_SEH_HANDLE_EX(ill);
+ break;
+ case EXCEPTION_INT_DIVIDE_BY_ZERO:
+ case EXCEPTION_INT_OVERFLOW:
+ case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+ case EXCEPTION_FLT_OVERFLOW:
+ case EXCEPTION_FLT_UNDERFLOW:
+ case EXCEPTION_FLT_INEXACT_RESULT:
+ W32_SEH_HANDLE_EX(fpe);
+ break;
+ default:
+ break;
+ }
+
+ /* Copy context back */
+ ctx->Eax = sctx->eax;
+ ctx->Ebx = sctx->ebx;
+ ctx->Ecx = sctx->ecx;
+ ctx->Edx = sctx->edx;
+ ctx->Ebp = sctx->ebp;
+ ctx->Esp = sctx->esp;
+ ctx->Esi = sctx->esi;
+ ctx->Edi = sctx->edi;
+ ctx->Eip = sctx->eip;
+
+ return res;
+}
+
+void win32_seh_init()
+{
+ old_handler = SetUnhandledExceptionFilter(seh_handler);
+}
+
+void win32_seh_cleanup()
+{
+ if (old_handler) SetUnhandledExceptionFilter(old_handler);
+}
-typedef struct sigcontext MonoContext;
+void win32_seh_set_handler(int type, MonoW32ExceptionHandler handler)
+{
+ switch (type) {
+ case SIGFPE:
+ fpe_handler = handler;
+ break;
+ case SIGILL:
+ ill_handler = handler;
+ break;
+ case SIGSEGV:
+ segv_handler = handler;
+ break;
+ default:
+ break;
+ }
+}
-#define MONO_CONTEXT_SET_IP(ctx,ip) do { (ctx)->SC_EIP = (long)ip; } while (0);
-#define MONO_CONTEXT_SET_BP(ctx,bp) do { (ctx)->SC_EBP = (long)bp; } while (0);
+#endif /* PLATFORM_WIN32 */
-#define MONO_CONTEXT_GET_IP(ctx) ((gpointer)((ctx)->SC_EIP))
-#define MONO_CONTEXT_GET_BP(ctx) ((gpointer)((ctx)->SC_EBP))
#ifdef MONO_USE_EXC_TABLES
/* offset 10 is just a guess, but it works for all methods tested */
if ((res = frame_state_for ((char *)addr + 10, &state_in))) {
- if (res->saved [X86_EBX] != 1 ||
- res->saved [X86_EDI] != 1 ||
- res->saved [X86_EBP] != 1 ||
- res->saved [X86_ESI] != 1) {
- return FALSE;
- }
- return TRUE;
- } else {
- return FALSE;
+ if (res->saved [X86_EBX] == 1 &&
+ res->saved [X86_EDI] == 1 &&
+ res->saved [X86_EBP] == 1 &&
+ res->saved [X86_ESI] == 1)
+ return TRUE;
}
+
+ return FALSE;
}
struct stack_frame
#endif
/*
- * arch_get_restore_context:
+ * mono_arch_get_restore_context:
*
* Returns a pointer to a method which restores a previously saved sigcontext.
*/
-static gpointer
-arch_get_restore_context (void)
+gpointer
+mono_arch_get_restore_context (void)
{
static guint8 *start = NULL;
guint8 *code;
}
/*
- * arch_get_call_filter:
+ * mono_arch_get_call_filter:
*
* Returns a pointer to a method which calls an exception filter. We
* also use this function to call finally handlers (we pass NULL as
* @exc object in this case).
*/
-static gpointer
-arch_get_call_filter (void)
+gpointer
+mono_arch_get_call_filter (void)
{
static guint8 start [64];
static int inited = 0;
return start;
inited = 1;
- /* call_filter (struct sigcontext *ctx, unsigned long eip, gpointer exc) */
+ /* call_filter (struct sigcontext *ctx, unsigned long eip) */
code = start;
x86_push_reg (code, X86_EBP);
x86_mov_reg_membase (code, X86_ECX, X86_EBP, 12, 4);
/* save EBP */
x86_push_reg (code, X86_EBP);
- /* push exc */
- x86_push_membase (code, X86_EBP, 16);
+
/* set new EBP */
x86_mov_reg_membase (code, X86_EBP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, SC_EBP), 4);
/* restore registers used by global register allocation (EBX & ESI) */
x86_mov_reg_membase (code, X86_EBX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, SC_EBX), 4);
x86_mov_reg_membase (code, X86_ESI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, SC_ESI), 4);
x86_mov_reg_membase (code, X86_EDI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, SC_EDI), 4);
- /* save the ESP - this is used by endfinally */
- x86_mov_membase_reg (code, X86_EBP, mono_exc_esp_offset, X86_ESP, 4);
+
/* call the handler */
x86_call_reg (code, X86_ECX);
- x86_alu_reg_imm (code, X86_ADD, X86_ESP, 4);
+
/* restore EBP */
x86_pop_reg (code, X86_EBP);
+
/* restore saved regs */
x86_pop_reg (code, X86_ESI);
x86_pop_reg (code, X86_EDI);
struct sigcontext ctx;
if (!restore_context)
- restore_context = arch_get_restore_context ();
+ restore_context = mono_arch_get_restore_context ();
/* adjust eip so that it point into the call instruction */
eip -= 1;
- ctx.SC_ESP = esp;
+ /* Pop argument and return address */
+ ctx.SC_ESP = esp + (2 * sizeof (gpointer));
ctx.SC_EIP = eip;
ctx.SC_EBP = ebp;
ctx.SC_EDI = edi;
}
/**
- * arch_get_throw_exception:
+ * mono_arch_get_throw_exception:
*
* Returns a function pointer which can be used to raise
* exceptions. The returned function has the following
}
/**
- * arch_get_throw_exception_by_name:
+ * mono_arch_get_throw_exception_by_name:
*
* Returns a function pointer which can be used to raise
* corlib exceptions. The returned function has the following
g_assert ((code - start) < 32);
return start;
-}
-
-static MonoArray *
-glist_to_array (GList *list)
-{
- MonoDomain *domain = mono_domain_get ();
- MonoArray *res;
- int len, i;
-
- if (!list)
- return NULL;
-
- len = g_list_length (list);
- res = mono_array_new (domain, mono_defaults.int_class, len);
-
- for (i = 0; list; list = list->next, i++)
- mono_array_set (res, gpointer, i, list->data);
-
- return res;
}
/* mono_arch_find_jit_info:
* the @lmf if necessary. @native_offset return the IP offset from the
* start of the function or -1 if that info is not available.
*/
-static MonoJitInfo *
-mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoContext *ctx,
+MonoJitInfo *
+mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
gboolean *managed)
{
MonoJitInfo *ji;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
- ji = mono_jit_info_table_find (domain, ip);
+ /* Avoid costly table lookup during stack overflow */
+ if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
+ ji = prev_ji;
+ else
+ ji = mono_jit_info_table_find (domain, ip);
if (trace)
*trace = NULL;
*new_ctx = *ctx;
- if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
- /* remove any unused lmf */
- *lmf = (*lmf)->previous_lmf;
- }
-
address = (char *)ip - (char *)ji->code_start;
if (native_offset)
*managed = TRUE;
if (trace) {
- source_location = mono_debug_source_location_from_address (ji->method, address, NULL);
- iloffset = mono_debug_il_offset_from_address (ji->method, address);
+ source_location = mono_debug_source_location_from_address (ji->method, address, NULL, domain);
+ iloffset = mono_debug_il_offset_from_address (ji->method, address, domain);
if (iloffset < 0)
tmpaddr = g_strdup_printf ("<0x%05x>", address);
g_free (source_location);
g_free (tmpaddr);
}
-
- offset = -1;
- /* restore caller saved registers */
- if (ji->used_regs & X86_EBX_MASK) {
- new_ctx->SC_EBX = *((int *)ctx->SC_EBP + offset);
- offset--;
+
+ /*
+ * Some managed methods like pinvoke wrappers might have save_lmf set.
+ * In this case, register save/restore code is not generated by the
+ * JIT, so we have to restore callee saved registers from the lmf.
+ */
+ if (ji->method->save_lmf) {
+ /*
+ * We only need to do this if the exception was raised in managed
+ * code, since otherwise the lmf was already popped of the stack.
+ */
+ if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
+ new_ctx->SC_ESI = (*lmf)->esi;
+ new_ctx->SC_EDI = (*lmf)->edi;
+ new_ctx->SC_EBX = (*lmf)->ebx;
+ }
}
- if (ji->used_regs & X86_EDI_MASK) {
- new_ctx->SC_EDI = *((int *)ctx->SC_EBP + offset);
- offset--;
+ else {
+ offset = -1;
+ /* restore caller saved registers */
+ if (ji->used_regs & X86_EBX_MASK) {
+ new_ctx->SC_EBX = *((int *)ctx->SC_EBP + offset);
+ offset--;
+ }
+ if (ji->used_regs & X86_EDI_MASK) {
+ new_ctx->SC_EDI = *((int *)ctx->SC_EBP + offset);
+ offset--;
+ }
+ if (ji->used_regs & X86_ESI_MASK) {
+ new_ctx->SC_ESI = *((int *)ctx->SC_EBP + offset);
+ }
}
- if (ji->used_regs & X86_ESI_MASK) {
- new_ctx->SC_ESI = *((int *)ctx->SC_EBP + offset);
+
+ if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
+ /* remove any unused lmf */
+ *lmf = (*lmf)->previous_lmf;
}
- new_ctx->SC_ESP = ctx->SC_EBP;
+ /* Pop EBP and the return address */
+ new_ctx->SC_ESP = ctx->SC_EBP + (2 * sizeof (gpointer));
/* we substract 1, so that the IP points into the call instruction */
new_ctx->SC_EIP = *((int *)ctx->SC_EBP + 1) - 1;
new_ctx->SC_EBP = *((int *)ctx->SC_EBP);
return NULL;
}
-MonoArray *
-ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
-{
- MonoDomain *domain = mono_domain_get ();
- MonoArray *res;
- MonoArray *ta = exc->trace_ips;
- int i, len;
-
- if (ta == NULL) {
- /* Exception is not thrown yet */
- return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
- }
-
- len = mono_array_length (ta);
-
- res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
-
- for (i = skip; i < len; i++) {
- MonoJitInfo *ji;
- MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
- gpointer ip = mono_array_get (ta, gpointer, i);
-
- ji = mono_jit_info_table_find (domain, ip);
- if (ji == NULL) {
- /* Unmanaged frame */
- mono_array_set (res, gpointer, i, sf);
- continue;
- }
-
- g_assert (ji != NULL);
-
- sf->method = mono_method_get_object (domain, ji->method, NULL);
- sf->native_offset = (char *)ip - (char *)ji->code_start;
-
- sf->il_offset = mono_debug_il_offset_from_address (ji->method, sf->native_offset);
-
- if (need_file_info) {
- gchar *filename;
-
- filename = mono_debug_source_location_from_address (ji->method, sf->native_offset, &sf->line);
-
- sf->filename = filename? mono_string_new (domain, filename): NULL;
- sf->column = 0;
-
- g_free (filename);
- }
-
- mono_array_set (res, gpointer, i, sf);
- }
-
- return res;
-}
-
-void
-mono_jit_walk_stack (MonoStackWalk func, gpointer user_data) {
- MonoDomain *domain = mono_domain_get ();
- MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
- MonoLMF *lmf = jit_tls->lmf;
- MonoJitInfo *ji, rji;
- gint native_offset, il_offset;
- gboolean managed;
-
- MonoContext ctx, new_ctx;
-
- MONO_CONTEXT_SET_IP (&ctx, __builtin_return_address (0));
- MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (1));
-
- while (MONO_CONTEXT_GET_BP (&ctx) < jit_tls->end_of_stack) {
-
- ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
- g_assert (ji);
-
- if (ji == (gpointer)-1)
- return;
-
- il_offset = mono_debug_il_offset_from_address (ji->method, native_offset);
-
- if (func (ji->method, native_offset, il_offset, managed, user_data))
- return;
-
- ctx = new_ctx;
- }
-}
-
-MonoBoolean
-ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
- MonoReflectionMethod **method,
- gint32 *iloffset, gint32 *native_offset,
- MonoString **file, gint32 *line, gint32 *column)
-{
- MonoDomain *domain = mono_domain_get ();
- MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
- MonoLMF *lmf = jit_tls->lmf;
- MonoJitInfo *ji, rji;
- MonoContext ctx, new_ctx;
-
- MONO_CONTEXT_SET_IP (&ctx, ves_icall_get_frame_info);
- MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (0));
-
- skip++;
-
- do {
- ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &ctx, &new_ctx, NULL, &lmf, native_offset, NULL);
-
- ctx = new_ctx;
-
- if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_BP (&ctx) >= jit_tls->end_of_stack)
- return FALSE;
-
- if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)
- continue;
-
- skip--;
-
- } while (skip >= 0);
-
- *method = mono_method_get_object (domain, ji->method, NULL);
- *iloffset = mono_debug_il_offset_from_address (ji->method, *native_offset);
-
- if (need_file_info) {
- gchar *filename;
-
- filename = mono_debug_source_location_from_address (ji->method, *native_offset, line);
-
- *file = filename? mono_string_new (domain, filename): NULL;
- *column = 0;
-
- g_free (filename);
- }
-
- return TRUE;
-}
-
/**
- * arch_handle_exception:
+ * mono_arch_handle_exception:
+ *
* @ctx: saved processor state
* @obj: the exception object
- * @test_only: only test if the exception is caught, but dont call handlers
- *
- *
*/
gboolean
-mono_arch_handle_exception (MonoContext *ctx, gpointer obj, gboolean test_only)
+mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
{
- MonoDomain *domain = mono_domain_get ();
- MonoJitInfo *ji, rji;
- static int (*call_filter) (MonoContext *, gpointer, gpointer) = NULL;
- MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
- MonoLMF *lmf = jit_tls->lmf;
- GList *trace_ips = NULL;
-
- g_assert (ctx != NULL);
- if (!obj) {
- MonoException *ex = mono_get_exception_null_reference ();
- ex->message = mono_string_new (domain,
- "Object reference not set to an instance of an object");
- obj = (MonoObject *)ex;
- }
-
- g_assert (mono_object_isinst (obj, mono_defaults.exception_class));
-
- if (!call_filter)
- call_filter = arch_get_call_filter ();
-
- g_assert (jit_tls->end_of_stack);
- g_assert (jit_tls->abort_func);
-
- if (!test_only) {
- MonoContext ctx_cp = *ctx;
- if (mono_jit_trace_calls)
- g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
- if (!mono_arch_handle_exception (&ctx_cp, obj, TRUE)) {
- if (mono_break_on_exc)
- G_BREAKPOINT ();
- mono_unhandled_exception (obj);
- }
- }
-
- while (1) {
- MonoContext new_ctx;
- char *trace = NULL;
-
- ji = mono_arch_find_jit_info (domain, jit_tls, &rji, ctx, &new_ctx,
- test_only ? &trace : NULL, &lmf, NULL, NULL);
- if (!ji) {
- g_warning ("Exception inside function without unwind info");
- g_assert_not_reached ();
- }
-
- if (ji != (gpointer)-1) {
-
- if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE) {
- char *tmp, *strace;
-
- trace_ips = g_list_append (trace_ips, MONO_CONTEXT_GET_IP (ctx));
-
- if (!((MonoException*)obj)->stack_trace)
- strace = g_strdup ("");
- else
- strace = mono_string_to_utf8 (((MonoException*)obj)->stack_trace);
-
- tmp = g_strdup_printf ("%s%s\n", strace, trace);
- g_free (strace);
-
- ((MonoException*)obj)->stack_trace = mono_string_new (domain, tmp);
-
- g_free (tmp);
- }
-
- if (ji->num_clauses) {
- int i;
-
- g_assert (ji->clauses);
-
- for (i = 0; i < ji->num_clauses; i++) {
- MonoJitExceptionInfo *ei = &ji->clauses [i];
-
- if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
- MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
- /* catch block */
- if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
- mono_object_isinst (obj, mono_class_get (ji->method->klass->image, ei->data.token))) ||
- ((ei->flags == MONO_EXCEPTION_CLAUSE_FILTER &&
- call_filter (ctx, ei->data.filter, obj)))) {
- if (test_only) {
- ((MonoException*)obj)->trace_ips = glist_to_array (trace_ips);
- g_list_free (trace_ips);
- return TRUE;
- }
- if (mono_jit_trace_calls)
- g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
- MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
- *((gpointer *)((char *)MONO_CONTEXT_GET_BP (ctx) + ji->exvar_offset)) = obj;
- jit_tls->lmf = lmf;
- return 0;
- }
- if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
- MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
- (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
- if (mono_jit_trace_calls)
- g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
- call_filter (ctx, ei->handler_start, NULL);
- }
-
- }
- }
- }
- }
-
- g_free (trace);
-
- *ctx = new_ctx;
-
- if ((ji == (gpointer)-1) || MONO_CONTEXT_GET_BP (ctx) >= jit_tls->end_of_stack) {
- if (!test_only) {
- jit_tls->lmf = lmf;
- jit_tls->abort_func (obj);
- g_assert_not_reached ();
- } else {
- ((MonoException*)obj)->trace_ips = glist_to_array (trace_ips);
- g_list_free (trace_ips);
- return FALSE;
- }
- }
- }
-
- g_assert_not_reached ();
+ return mono_handle_exception (sigctx, obj, test_only);
}
-
-
projects / mono.git / blobdiff