#include <mono/metadata/exception.h>
#include <mono/metadata/gc-internal.h>
#include <mono/metadata/mono-debug.h>
+#include <mono/utils/mono-mmap.h>
#include "mini.h"
#include "mini-x86.h"
+#include "tasklets.h"
+#include "debug-mini.h"
#ifdef PLATFORM_WIN32
static void (*restore_stack) (void *);
do {
MonoContext new_ctx;
- ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &rji, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
+ ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &rji, &ctx, &new_ctx, &lmf, NULL);
if (!ji) {
g_warning ("Exception inside function without unwind info");
g_assert_not_reached ();
ctx->Edi = sctx->edi;
ctx->Eip = sctx->eip;
+ g_free (sctx);
+
return res;
}
x86_mov_reg_membase (code, X86_ESI, X86_EAX, G_STRUCT_OFFSET (MonoContext, esi), 4);
x86_mov_reg_membase (code, X86_EDI, X86_EAX, G_STRUCT_OFFSET (MonoContext, edi), 4);
+ /* align stack and save ESP */
+ x86_mov_reg_reg (code, X86_EDX, X86_ESP, 4);
+ x86_alu_reg_imm (code, X86_AND, X86_ESP, -MONO_ARCH_FRAME_ALIGNMENT);
+ g_assert (MONO_ARCH_FRAME_ALIGNMENT >= 8);
+ x86_alu_reg_imm (code, X86_SUB, X86_ESP, MONO_ARCH_FRAME_ALIGNMENT - 8);
+ x86_push_reg (code, X86_EDX);
+
/* call the handler */
x86_call_reg (code, X86_ECX);
+ /* restore ESP */
+ x86_pop_reg (code, X86_ESP);
+
/* restore EBP */
x86_pop_reg (code, X86_EBP);
ctx.ecx = ecx;
ctx.eax = eax;
- if (mono_debugger_throw_exception ((gpointer)(eip - 5), (gpointer)esp, exc)) {
- /*
- * The debugger wants us to stop on the `throw' instruction.
- * By the time we get here, it already inserted a breakpoint on
- * eip - 5 (which is the address of the call).
- */
- ctx.eip = eip - 5;
- ctx.esp = esp + sizeof (gpointer);
- restore_context (&ctx);
- g_assert_not_reached ();
- }
-
- /* adjust eip so that it point into the call instruction */
- ctx.eip -= 1;
-
if (mono_object_isinst (exc, mono_defaults.exception_class)) {
MonoException *mono_ex = (MonoException*)exc;
if (!rethrow)
mono_ex->stack_trace = NULL;
}
+
+ if (mono_debug_using_mono_debugger ()) {
+ guint8 buf [16], *code;
+
+ mono_breakpoint_clean_code (NULL, (gpointer)eip, 8, buf, sizeof (buf));
+ code = buf + 8;
+
+ if (buf [3] == 0xe8) {
+ MonoContext ctx_cp = ctx;
+ ctx_cp.eip = eip - 5;
+
+ if (mono_debugger_handle_exception (&ctx_cp, exc)) {
+ restore_context (&ctx_cp);
+ g_assert_not_reached ();
+ }
+ }
+ }
+
+ /* adjust eip so that it point into the call instruction */
+ ctx.eip -= 1;
+
mono_handle_exception (&ctx, exc, (gpointer)eip, FALSE);
restore_context (&ctx);
gpointer
mono_arch_get_throw_exception_by_name (void)
{
- static guint8* start;
- static int inited = 0;
+ guint8* start;
guint8 *code;
- if (inited)
- return start;
-
- inited = 1;
- code = start = mono_global_codeman_reserve (32);
+ start = code = mono_global_codeman_reserve (32);
- x86_push_membase (code, X86_ESP, 4); /* exception name */
- x86_push_imm (code, "System");
- x86_push_imm (code, mono_defaults.exception_class->image);
- x86_call_code (code, mono_exception_from_name);
- x86_alu_reg_imm (code, X86_ADD, X86_ESP, 12);
- /* save the newly create object (overwrite exception name)*/
- x86_mov_membase_reg (code, X86_ESP, 4, X86_EAX, 4);
- x86_jump_code (code, mono_arch_get_throw_exception ());
+ /* Not used */
+ x86_breakpoint (code);
- g_assert ((code - start) < 32);
+ mono_arch_flush_icache (start, code - start);
return start;
}
inited = 1;
code = start = mono_global_codeman_reserve (64);
- x86_push_membase (code, X86_ESP, 4); /* token */
+ x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4); /* token */
+ x86_alu_reg_imm (code, X86_ADD, X86_EAX, MONO_TOKEN_TYPE_DEF);
+ x86_push_reg (code, X86_EAX);
x86_push_imm (code, mono_defaults.exception_class->image);
x86_call_code (code, mono_exception_from_token);
x86_alu_reg_imm (code, X86_ADD, X86_ESP, 8);
*/
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)
+ MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
{
MonoJitInfo *ji;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
if (managed)
*managed = FALSE;
- if (ji != NULL) {
- int offset;
+ *new_ctx = *ctx;
- *new_ctx = *ctx;
+ if (ji != NULL) {
+ gssize regs [MONO_MAX_IREGS + 1];
+ guint8 *cfa;
+ guint32 unwind_info_len;
+ guint8 *unwind_info;
if (managed)
if (!ji->method->wrapper_type)
*managed = TRUE;
- /*
- * 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->esi = (*lmf)->esi;
- new_ctx->edi = (*lmf)->edi;
- new_ctx->ebx = (*lmf)->ebx;
- }
- }
- else {
- offset = -1;
- /* restore caller saved registers */
- if (ji->used_regs & X86_EBX_MASK) {
- new_ctx->ebx = *((int *)ctx->ebp + offset);
- offset--;
- }
- if (ji->used_regs & X86_EDI_MASK) {
- new_ctx->edi = *((int *)ctx->ebp + offset);
- offset--;
- }
- if (ji->used_regs & X86_ESI_MASK) {
- new_ctx->esi = *((int *)ctx->ebp + offset);
- }
- }
+ if (ji->from_aot)
+ unwind_info = mono_aot_get_unwind_info (ji, &unwind_info_len);
+ else
+ unwind_info = mono_get_cached_unwind_info (ji->used_regs, &unwind_info_len);
+
+ regs [X86_EAX] = new_ctx->eax;
+ regs [X86_EBX] = new_ctx->ebx;
+ regs [X86_ECX] = new_ctx->ecx;
+ regs [X86_EDX] = new_ctx->edx;
+ regs [X86_ESP] = new_ctx->esp;
+ regs [X86_EBP] = new_ctx->ebp;
+ regs [X86_ESI] = new_ctx->esi;
+ regs [X86_EDI] = new_ctx->edi;
+ regs [X86_NREG] = new_ctx->eip;
+
+ mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
+ (guint8*)ji->code_start + ji->code_size,
+ ip, regs, MONO_MAX_IREGS + 1, &cfa);
+
+ new_ctx->eax = regs [X86_EAX];
+ new_ctx->ebx = regs [X86_EBX];
+ new_ctx->ecx = regs [X86_ECX];
+ new_ctx->edx = regs [X86_EDX];
+ new_ctx->esp = regs [X86_ESP];
+ new_ctx->ebp = regs [X86_EBP];
+ new_ctx->esi = regs [X86_ESI];
+ new_ctx->edi = regs [X86_EDI];
+ new_ctx->eip = regs [X86_NREG];
+
+ /* The CFA becomes the new SP value */
+ new_ctx->esp = (gssize)cfa;
+
+ /* Adjust IP */
+ new_ctx->eip --;
if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
/* remove any unused lmf */
- *lmf = (*lmf)->previous_lmf;
+ *lmf = (gpointer)(((guint32)(*lmf)->previous_lmf) & ~1);
}
- /* Pop EBP and the return address */
- new_ctx->esp = ctx->ebp + (2 * sizeof (gpointer));
- /* we substract 1, so that the IP points into the call instruction */
- new_ctx->eip = *((int *)ctx->ebp + 1) - 1;
- new_ctx->ebp = *((int *)ctx->ebp);
-
/* Pop arguments off the stack */
{
MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (ji->method)->param_count + 1);
*new_ctx = *ctx;
- if (!(*lmf)->method)
- return (gpointer)-1;
-
if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->eip))) {
} else {
- memset (res, 0, sizeof (MonoJitInfo));
+ if (!((guint32)((*lmf)->previous_lmf) & 1))
+ /* Top LMF entry */
+ return (gpointer)-1;
+ /* Trampoline lmf frame */
+ memset (res, 0, MONO_SIZEOF_JIT_INFO);
res->method = (*lmf)->method;
}
new_ctx->ebx = (*lmf)->ebx;
new_ctx->ebp = (*lmf)->ebp;
new_ctx->eip = (*lmf)->eip;
- /* the lmf is always stored on the stack, so the following
- * expression points to a stack location which can be used as ESP */
- new_ctx->esp = (unsigned long)&((*lmf)->eip);
- *lmf = (*lmf)->previous_lmf;
+ /* Check if we are in a trampoline LMF frame */
+ if ((guint32)((*lmf)->previous_lmf) & 1) {
+ /* lmf->esp is set by the trampoline code */
+ new_ctx->esp = (*lmf)->esp;
+
+ /* Pop arguments off the stack */
+ /* FIXME: Handle the delegate case too ((*lmf)->method == NULL) */
+ /* FIXME: Handle the IMT/vtable case too */
+ if ((*lmf)->method && (*lmf)->method != MONO_FAKE_IMT_METHOD && (*lmf)->method != MONO_FAKE_VTABLE_METHOD) {
+ MonoMethod *method = (*lmf)->method;
+ MonoJitArgumentInfo *arg_info = g_newa (MonoJitArgumentInfo, mono_method_signature (method)->param_count + 1);
+
+ guint32 stack_to_pop = mono_arch_get_argument_info (mono_method_signature (method), mono_method_signature (method)->param_count, arg_info);
+ new_ctx->esp += stack_to_pop;
+ }
+ }
+ else
+ /* the lmf is always stored on the stack, so the following
+ * expression points to a stack location which can be used as ESP */
+ new_ctx->esp = (unsigned long)&((*lmf)->eip);
+
+ *lmf = (gpointer)(((guint32)(*lmf)->previous_lmf) & ~1);
return ji ? ji : res;
}
mono_arch_sigctx_to_monoctx (sigctx, &mctx);
+ if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj))
+ return TRUE;
+
mono_handle_exception (&mctx, obj, (gpointer)mctx.eip, test_only);
mono_arch_monoctx_to_sigctx (&mctx, sigctx);
return TRUE;
}
+
+static void
+restore_soft_guard_pages (void)
+{
+ MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
+ if (jit_tls->stack_ovf_guard_base)
+ mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_NONE);
+}
+
+/*
+ * this function modifies mctx so that when it is restored, it
+ * won't execcute starting at mctx.eip, but in a function that
+ * will restore the protection on the soft-guard pages and return back to
+ * continue at mctx.eip.
+ */
+static void
+prepare_for_guard_pages (MonoContext *mctx)
+{
+ gpointer *sp;
+ sp = (gpointer)(mctx->esp);
+ sp -= 1;
+ /* the resturn addr */
+ sp [0] = (gpointer)(mctx->eip);
+ mctx->eip = (unsigned long)restore_soft_guard_pages;
+ mctx->esp = (unsigned long)sp;
+}
+
+static void
+altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean stack_ovf)
+{
+ void (*restore_context) (MonoContext *);
+ MonoContext mctx;
+
+ restore_context = mono_arch_get_restore_context ();
+ mono_arch_sigctx_to_monoctx (sigctx, &mctx);
+
+ if (mono_debugger_handle_exception (&mctx, (MonoObject *)obj)) {
+ if (stack_ovf)
+ prepare_for_guard_pages (&mctx);
+ restore_context (&mctx);
+ }
+
+ mono_handle_exception (&mctx, obj, (gpointer)mctx.eip, FALSE);
+ if (stack_ovf)
+ prepare_for_guard_pages (&mctx);
+ restore_context (&mctx);
+}
+
+void
+mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
+{
+#ifdef MONO_ARCH_USE_SIGACTION
+ MonoException *exc = NULL;
+ ucontext_t *ctx = (ucontext_t*)sigctx;
+ MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), (gpointer)UCONTEXT_REG_EIP (ctx));
+ gpointer *sp;
+ int frame_size;
+
+ /* if we didn't find a managed method for the ip address and it matches the fault
+ * address, we assume we followed a broken pointer during an indirect call, so
+ * we try the lookup again with the return address pushed on the stack
+ */
+ if (!ji && fault_addr == (gpointer)UCONTEXT_REG_EIP (ctx)) {
+ glong *sp = (gpointer)UCONTEXT_REG_ESP (ctx);
+ ji = mono_jit_info_table_find (mono_domain_get (), (gpointer)sp [0]);
+ if (ji)
+ UCONTEXT_REG_EIP (ctx) = sp [0];
+ }
+ if (stack_ovf)
+ exc = mono_domain_get ()->stack_overflow_ex;
+ if (!ji)
+ mono_handle_native_sigsegv (SIGSEGV, sigctx);
+ /* setup a call frame on the real stack so that control is returned there
+ * and exception handling can continue.
+ * If this was a stack overflow the caller already ensured the stack pages
+ * needed have been unprotected.
+ * The frame looks like:
+ * ucontext struct
+ * test_only arg
+ * exception arg
+ * ctx arg
+ * return ip
+ */
+ frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 4;
+ frame_size += 15;
+ frame_size &= ~15;
+ sp = (gpointer)(UCONTEXT_REG_ESP (ctx) & ~15);
+ sp = (gpointer)((char*)sp - frame_size);
+ /* the incoming arguments are aligned to 16 bytes boundaries, so the return address IP
+ * goes at sp [-1]
+ */
+ sp [-1] = (gpointer)UCONTEXT_REG_EIP (ctx);
+ sp [0] = sp + 4;
+ sp [1] = exc;
+ sp [2] = (gpointer)stack_ovf;
+ /* may need to adjust pointers in the new struct copy, depending on the OS */
+ memcpy (sp + 4, ctx, sizeof (ucontext_t));
+ /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
+ UCONTEXT_REG_EIP (ctx) = (unsigned long)altstack_handle_and_restore;
+ UCONTEXT_REG_ESP (ctx) = (unsigned long)(sp - 1);
+#endif
+}
+
+#if MONO_SUPPORT_TASKLETS
+MonoContinuationRestore
+mono_tasklets_arch_restore (void)
+{
+ static guint8* saved = NULL;
+ guint8 *code, *start;
+
+ if (saved)
+ return (MonoContinuationRestore)saved;
+ code = start = mono_global_codeman_reserve (48);
+ /* the signature is: restore (MonoContinuation *cont, int state, MonoLMF **lmf_addr) */
+ /* put cont in edx */
+ x86_mov_reg_membase (code, X86_EDX, X86_ESP, 4, 4);
+ /* setup the copy of the stack */
+ x86_mov_reg_membase (code, X86_ECX, X86_EDX, G_STRUCT_OFFSET (MonoContinuation, stack_used_size), 4);
+ x86_shift_reg_imm (code, X86_SHR, X86_ECX, 2);
+ x86_cld (code);
+ x86_mov_reg_membase (code, X86_ESI, X86_EDX, G_STRUCT_OFFSET (MonoContinuation, saved_stack), 4);
+ x86_mov_reg_membase (code, X86_EDI, X86_EDX, G_STRUCT_OFFSET (MonoContinuation, return_sp), 4);
+ x86_prefix (code, X86_REP_PREFIX);
+ x86_movsl (code);
+
+ /* now restore the registers from the LMF */
+ x86_mov_reg_membase (code, X86_ECX, X86_EDX, G_STRUCT_OFFSET (MonoContinuation, lmf), 4);
+ x86_mov_reg_membase (code, X86_EBX, X86_ECX, G_STRUCT_OFFSET (MonoLMF, ebx), 4);
+ x86_mov_reg_membase (code, X86_EBP, X86_ECX, G_STRUCT_OFFSET (MonoLMF, ebp), 4);
+ x86_mov_reg_membase (code, X86_ESI, X86_ECX, G_STRUCT_OFFSET (MonoLMF, esi), 4);
+ x86_mov_reg_membase (code, X86_EDI, X86_ECX, G_STRUCT_OFFSET (MonoLMF, edi), 4);
+
+ /* restore the lmf chain */
+ /*x86_mov_reg_membase (code, X86_ECX, X86_ESP, 12, 4);
+ x86_mov_membase_reg (code, X86_ECX, 0, X86_EDX, 4);*/
+
+ /* state in eax, so it's setup as the return value */
+ x86_mov_reg_membase (code, X86_EAX, X86_ESP, 8, 4);
+ x86_jump_membase (code, X86_EDX, G_STRUCT_OFFSET (MonoContinuation, return_ip));
+ g_assert ((code - start) <= 48);
+ saved = start;
+ return (MonoContinuationRestore)saved;
+}
+#endif
+
projects / mono.git / blobdiff