#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
+#include <mono/metadata/threads-types.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 <mono/utils/mono-mmap.h>
#include "mini.h"
#include "mini-amd64.h"
* Returns a pointer to a method which restores a previously saved sigcontext.
*/
gpointer
-mono_arch_get_restore_context (void)
+mono_arch_get_restore_context_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
- static guint8 *start = NULL;
- static gboolean inited = FALSE;
+ guint8 *start = NULL;
guint8 *code;
- if (inited)
- return start;
-
/* restore_contect (MonoContext *ctx) */
- start = code = mono_global_codeman_reserve (256);
+ *ji = NULL;
- /* get return address */
- amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rip), 8);
+ start = code = mono_global_codeman_reserve (256);
- /* Restore registers */
- amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rbp), 8);
- amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rbx), 8);
- amd64_mov_reg_membase (code, AMD64_R12, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r12), 8);
- amd64_mov_reg_membase (code, AMD64_R13, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r13), 8);
- amd64_mov_reg_membase (code, AMD64_R14, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r14), 8);
- amd64_mov_reg_membase (code, AMD64_R15, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r15), 8);
+ amd64_mov_reg_reg (code, AMD64_R11, AMD64_ARG_REG1, 8);
+
+ /* Restore all registers except %rip and %r11 */
+ amd64_mov_reg_membase (code, AMD64_RAX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rax), 8);
+ amd64_mov_reg_membase (code, AMD64_RCX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rcx), 8);
+ amd64_mov_reg_membase (code, AMD64_RDX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdx), 8);
+ amd64_mov_reg_membase (code, AMD64_RBX, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbx), 8);
+ amd64_mov_reg_membase (code, AMD64_RBP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rbp), 8);
+ amd64_mov_reg_membase (code, AMD64_RSI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsi), 8);
+ amd64_mov_reg_membase (code, AMD64_RDI, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rdi), 8);
+ //amd64_mov_reg_membase (code, AMD64_R8, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r8), 8);
+ //amd64_mov_reg_membase (code, AMD64_R9, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r9), 8);
+ //amd64_mov_reg_membase (code, AMD64_R10, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r10), 8);
+ amd64_mov_reg_membase (code, AMD64_R12, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r12), 8);
+ amd64_mov_reg_membase (code, AMD64_R13, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r13), 8);
+ amd64_mov_reg_membase (code, AMD64_R14, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r14), 8);
+ amd64_mov_reg_membase (code, AMD64_R15, AMD64_R11, G_STRUCT_OFFSET (MonoContext, r15), 8);
+
+ amd64_mov_reg_membase (code, AMD64_RSP, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rsp), 8);
- amd64_mov_reg_membase (code, AMD64_RSP, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rsp), 8);
+ /* get return address */
+ amd64_mov_reg_membase (code, AMD64_R11, AMD64_R11, G_STRUCT_OFFSET (MonoContext, rip), 8);
/* jump to the saved IP */
- amd64_jump_reg (code, AMD64_RAX);
+ amd64_jump_reg (code, AMD64_R11);
- inited = TRUE;
+ mono_arch_flush_icache (start, code - start);
+
+ *code_size = code - start;
return start;
}
* @exc object in this case).
*/
gpointer
-mono_arch_get_call_filter (void)
+mono_arch_get_call_filter_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
- static guint8 *start;
- static gboolean inited = FALSE;
+ guint8 *start;
int i;
guint8 *code;
guint32 pos;
- if (inited)
- return start;
+ *ji = NULL;
- start = code = mono_global_codeman_reserve (64);
+ start = code = mono_global_codeman_reserve (128);
/* call_filter (MonoContext *ctx, unsigned long eip) */
code = start;
amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
/* set new EBP */
- amd64_mov_reg_membase (code, AMD64_RBP, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rbp), 8);
+ amd64_mov_reg_membase (code, AMD64_RBP, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbp), 8);
/* load callee saved regs */
- amd64_mov_reg_membase (code, AMD64_RBX, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, rbx), 8);
- amd64_mov_reg_membase (code, AMD64_R12, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r12), 8);
- amd64_mov_reg_membase (code, AMD64_R13, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r13), 8);
- amd64_mov_reg_membase (code, AMD64_R14, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r14), 8);
- amd64_mov_reg_membase (code, AMD64_R15, AMD64_RDI, G_STRUCT_OFFSET (MonoContext, r15), 8);
+ amd64_mov_reg_membase (code, AMD64_RBX, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rbx), 8);
+ amd64_mov_reg_membase (code, AMD64_R12, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r12), 8);
+ amd64_mov_reg_membase (code, AMD64_R13, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r13), 8);
+ amd64_mov_reg_membase (code, AMD64_R14, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r14), 8);
+ amd64_mov_reg_membase (code, AMD64_R15, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, r15), 8);
+#ifdef PLATFORM_WIN32
+ amd64_mov_reg_membase (code, AMD64_RDI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rdi), 8);
+ amd64_mov_reg_membase (code, AMD64_RSI, AMD64_ARG_REG1, G_STRUCT_OFFSET (MonoContext, rsi), 8);
+#endif
/* call the handler */
- amd64_call_reg (code, AMD64_RSI);
+ amd64_call_reg (code, AMD64_ARG_REG2);
if (! (pos & 8))
amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
amd64_leave (code);
amd64_ret (code);
- g_assert ((code - start) < 64);
+ g_assert ((code - start) < 128);
- inited = TRUE;
+ mono_arch_flush_icache (start, code - start);
+
+ *code_size = code - start;
return start;
}
-static void
-throw_exception (MonoObject *exc, guint64 rip, guint64 rsp,
- guint64 rbx, guint64 rbp, guint64 r12, guint64 r13,
- guint64 r14, guint64 r15, guint64 rethrow)
+/*
+ * The first few arguments are dummy, to force the other arguments to be passed on
+ * the stack, this avoids overwriting the argument registers in the throw trampoline.
+ */
+void
+mono_amd64_throw_exception (guint64 dummy1, guint64 dummy2, guint64 dummy3, guint64 dummy4,
+ guint64 dummy5, guint64 dummy6,
+ MonoObject *exc, guint64 rip, guint64 rsp,
+ guint64 rbx, guint64 rbp, guint64 r12, guint64 r13,
+ guint64 r14, guint64 r15, guint64 rdi, guint64 rsi,
+ guint64 rax, guint64 rcx, guint64 rdx,
+ guint64 rethrow)
{
static void (*restore_context) (MonoContext *);
MonoContext ctx;
if (!restore_context)
- restore_context = mono_arch_get_restore_context ();
+ restore_context = mono_get_restore_context ();
ctx.rsp = rsp;
ctx.rip = rip;
ctx.r13 = r13;
ctx.r14 = r14;
ctx.r15 = r15;
+ ctx.rdi = rdi;
+ ctx.rsi = rsi;
+ ctx.rax = rax;
+ ctx.rcx = rcx;
+ ctx.rdx = rdx;
if (!rethrow && mono_debugger_throw_exception ((gpointer)(rip - 8), (gpointer)rsp, exc)) {
/*
}
static gpointer
-get_throw_trampoline (gboolean rethrow)
+get_throw_trampoline (gboolean rethrow, guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
guint8* start;
guint8 *code;
code = start;
- /* Exception */
- amd64_mov_reg_reg (code, AMD64_RDI, AMD64_RDI, 8);
- /* IP */
- amd64_mov_reg_membase (code, AMD64_RSI, AMD64_RSP, 0, 8);
- /* SP */
- amd64_lea_membase (code, AMD64_RDX, AMD64_RSP, 8);
- /* Callee saved regs */
- amd64_mov_reg_reg (code, AMD64_RCX, AMD64_RBX, 8);
- amd64_mov_reg_reg (code, AMD64_R8, AMD64_RBP, 8);
- amd64_mov_reg_reg (code, AMD64_R9, AMD64_R12, 8);
- /* align stack */
- amd64_push_imm (code, 0);
+ *ji = NULL;
+
+ amd64_mov_reg_reg (code, AMD64_R11, AMD64_RSP, 8);
+
/* reverse order */
amd64_push_imm (code, rethrow);
+ amd64_push_reg (code, AMD64_RDX);
+ amd64_push_reg (code, AMD64_RCX);
+ amd64_push_reg (code, AMD64_RAX);
+ amd64_push_reg (code, AMD64_RSI);
+ amd64_push_reg (code, AMD64_RDI);
amd64_push_reg (code, AMD64_R15);
amd64_push_reg (code, AMD64_R14);
amd64_push_reg (code, AMD64_R13);
+ amd64_push_reg (code, AMD64_R12);
+ amd64_push_reg (code, AMD64_RBP);
+ amd64_push_reg (code, AMD64_RBX);
+
+ /* SP */
+ amd64_lea_membase (code, AMD64_RAX, AMD64_R11, 8);
+ amd64_push_reg (code, AMD64_RAX);
+
+ /* IP */
+ amd64_push_membase (code, AMD64_R11, 0);
+
+ /* Exception */
+ amd64_push_reg (code, AMD64_ARG_REG1);
+
+#ifdef PLATFORM_WIN32
+ /* align stack */
+ amd64_push_imm (code, 0);
+ amd64_push_imm (code, 0);
+ amd64_push_imm (code, 0);
+ amd64_push_imm (code, 0);
+ amd64_push_imm (code, 0);
+ amd64_push_imm (code, 0);
+#endif
- amd64_mov_reg_imm (code, AMD64_R11, throw_exception);
+ if (aot) {
+ *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_throw_exception");
+ amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
+ } else {
+ amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_throw_exception);
+ }
amd64_call_reg (code, AMD64_R11);
amd64_breakpoint (code);
+ mono_arch_flush_icache (start, code - start);
+
g_assert ((code - start) < 64);
+ *code_size = code - start;
+
return start;
}
*
*/
gpointer
-mono_arch_get_throw_exception (void)
+mono_arch_get_throw_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
- static guint8* start;
- static gboolean inited = FALSE;
-
- if (inited)
- return start;
-
- start = get_throw_trampoline (FALSE);
-
- inited = TRUE;
-
- return start;
+ return get_throw_trampoline (FALSE, code_size, ji, aot);
}
gpointer
-mono_arch_get_rethrow_exception (void)
+mono_arch_get_rethrow_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
- static guint8* start;
- static gboolean inited = FALSE;
-
- if (inited)
- return start;
-
- start = get_throw_trampoline (TRUE);
-
- inited = TRUE;
-
- return start;
+ return get_throw_trampoline (TRUE, code_size, ji, aot);
}
gpointer
-mono_arch_get_throw_exception_by_name (void)
+mono_arch_get_throw_exception_by_name_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
- static guint8* start;
- static gboolean inited = FALSE;
+ guint8* start;
guint8 *code;
- if (inited)
- return start;
-
start = code = mono_global_codeman_reserve (64);
+ *ji = NULL;
+
/* Not used on amd64 */
amd64_breakpoint (code);
+ mono_arch_flush_icache (start, code - start);
+
+ *code_size = code - start;
+
return start;
}
* needs no relocations in the caller.
*/
gpointer
-mono_arch_get_throw_corlib_exception (void)
+mono_arch_get_throw_corlib_exception_full (guint32 *code_size, MonoJumpInfo **ji, gboolean aot)
{
static guint8* start;
- static gboolean inited = FALSE;
guint8 *code;
guint64 throw_ex;
- if (inited)
- return start;
-
start = code = mono_global_codeman_reserve (64);
+ *ji = NULL;
+
/* Push throw_ip */
- amd64_push_reg (code, AMD64_RSI);
+ amd64_push_reg (code, AMD64_ARG_REG2);
/* Call exception_from_token */
- amd64_mov_reg_reg (code, AMD64_RSI, AMD64_RDI, 8);
- amd64_mov_reg_imm (code, AMD64_RDI, mono_defaults.exception_class->image);
- amd64_mov_reg_imm (code, AMD64_R11, mono_exception_from_token);
+ amd64_mov_reg_reg (code, AMD64_ARG_REG2, AMD64_ARG_REG1, 8);
+ if (aot) {
+ *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_IMAGE, mono_defaults.exception_class->image);
+ amd64_mov_reg_membase (code, AMD64_ARG_REG1, AMD64_RIP, 0, 8);
+ *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_exception_from_token");
+ amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
+ } else {
+ amd64_mov_reg_imm (code, AMD64_ARG_REG1, mono_defaults.exception_class->image);
+ amd64_mov_reg_imm (code, AMD64_R11, mono_exception_from_token);
+ }
+#ifdef PLATFORM_WIN32
+ amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 32);
+#endif
amd64_call_reg (code, AMD64_R11);
+#ifdef PLATFORM_WIN32
+ amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 32);
+#endif
/* Compute throw_ip */
- amd64_pop_reg (code, AMD64_RSI);
+ amd64_pop_reg (code, AMD64_ARG_REG2);
/* return addr */
- amd64_pop_reg (code, AMD64_RDX);
- amd64_alu_reg_reg (code, X86_SUB, AMD64_RDX, AMD64_RSI);
+ amd64_pop_reg (code, AMD64_ARG_REG3);
+ amd64_alu_reg_reg (code, X86_SUB, AMD64_ARG_REG3, AMD64_ARG_REG2);
/* Put the throw_ip at the top of the misaligned stack */
- amd64_push_reg (code, AMD64_RDX);
+ amd64_push_reg (code, AMD64_ARG_REG3);
- throw_ex = (guint64)mono_arch_get_throw_exception ();
+ throw_ex = (guint64)mono_get_throw_exception ();
/* Call throw_exception */
- amd64_mov_reg_reg (code, AMD64_RDI, AMD64_RAX, 8);
- amd64_mov_reg_imm (code, AMD64_R11, throw_ex);
+ amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_RAX, 8);
+ if (aot) {
+ *ji = mono_patch_info_list_prepend (*ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_throw_exception");
+ amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
+ } else {
+ amd64_mov_reg_imm (code, AMD64_R11, throw_ex);
+ }
/* The original IP is on the stack */
amd64_jump_reg (code, AMD64_R11);
g_assert ((code - start) < 64);
- inited = TRUE;
+ mono_arch_flush_icache (start, code - start);
+
+ *code_size = code - start;
return start;
}
if (managed)
*managed = FALSE;
+ *new_ctx = *ctx;
+
if (ji != NULL) {
int offset;
gboolean omit_fp = (ji->used_regs & (1 << 31)) > 0;
- *new_ctx = *ctx;
-
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 a method has save_lmf set, then 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) {
+ MonoLMF *lmf_addr;
+
/*
- * We only need to do this if the exception was raised in managed
- * code, since otherwise the lmf was already popped of the stack.
+ * *lmf might not point to the LMF pushed by this method, so compute the LMF
+ * address instead.
*/
- if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
- new_ctx->rbp = (*lmf)->ebp;
- new_ctx->rbx = (*lmf)->rbx;
- new_ctx->rsp = (*lmf)->rsp;
- new_ctx->r12 = (*lmf)->r12;
- new_ctx->r13 = (*lmf)->r13;
- new_ctx->r14 = (*lmf)->r14;
- new_ctx->r15 = (*lmf)->r15;
- }
+ if (omit_fp)
+ lmf_addr = (MonoLMF*)ctx->rsp;
+ else
+ lmf_addr = (MonoLMF*)(ctx->rbp - sizeof (MonoLMF));
+
+ new_ctx->rbp = lmf_addr->rbp;
+ new_ctx->rbx = lmf_addr->rbx;
+ new_ctx->r12 = lmf_addr->r12;
+ new_ctx->r13 = lmf_addr->r13;
+ new_ctx->r14 = lmf_addr->r14;
+ new_ctx->r15 = lmf_addr->r15;
}
else {
offset = omit_fp ? 0 : -1;
if (*lmf && ((*lmf) != jit_tls->first_lmf) && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->rsp)) {
/* remove any unused lmf */
- *lmf = (*lmf)->previous_lmf;
+ *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~1);
}
if (omit_fp) {
return ji;
} else if (*lmf) {
-
- *new_ctx = *ctx;
-
- if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->rip))) {
+ guint64 rip;
+
+ if (((guint64)(*lmf)->previous_lmf) & 1) {
+ /* This LMF has the rip field set */
+ rip = (*lmf)->rip;
+ } else if ((*lmf)->rsp == 0) {
+ /* Top LMF entry */
+ return (gpointer)-1;
} else {
+ /*
+ * The rsp field is set just before the call which transitioned to native
+ * code. Obtain the rip from the stack.
+ */
+ rip = *(guint64*)((*lmf)->rsp - sizeof (gpointer));
+ }
+
+ ji = mono_jit_info_table_find (domain, (gpointer)rip);
+ if (!ji) {
if (!(*lmf)->method)
/* Top LMF entry */
return (gpointer)-1;
res->method = (*lmf)->method;
}
- new_ctx->rip = (*lmf)->rip;
- new_ctx->rbp = (*lmf)->ebp;
+ new_ctx->rip = rip;
+ new_ctx->rbp = (*lmf)->rbp;
new_ctx->rsp = (*lmf)->rsp;
new_ctx->rbx = (*lmf)->rbx;
new_ctx->r14 = (*lmf)->r14;
new_ctx->r15 = (*lmf)->r15;
- *lmf = (*lmf)->previous_lmf;
+ *lmf = (gpointer)(((guint64)(*lmf)->previous_lmf) & ~1);
return ji ? ji : res;
}
}
static void
-altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean test_only)
+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->rsp);
+ sp -= 1;
+ /* the return addr */
+ sp [0] = (gpointer)(mctx->rip);
+ mctx->rip = (guint64)restore_soft_guard_pages;
+ mctx->rsp = (guint64)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 ();
+ restore_context = mono_get_restore_context ();
mono_arch_sigctx_to_monoctx (sigctx, &mctx);
- mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), test_only);
+ mono_handle_exception (&mctx, obj, MONO_CONTEXT_GET_IP (&mctx), FALSE);
+ if (stack_ovf)
+ prepare_for_guard_pages (&mctx);
restore_context (&mctx);
}
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;
guint64 *gregs = gregs_from_ucontext (ctx);
MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), (gpointer)gregs [REG_RIP]);
gpointer *sp;
int frame_size;
- if (stack_ovf) {
- const char *method;
- /* we don't do much now, but we can warn the user with a useful message */
- fprintf (stderr, "Stack overflow: IP: %p, SP: %p\n", (gpointer)gregs [REG_RIP], (gpointer)gregs [REG_RSP]);
- if (ji && ji->method)
- method = mono_method_full_name (ji->method, TRUE);
- else
- method = "Unmanaged";
- fprintf (stderr, "At %s\n", method);
- abort ();
- }
+ 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.
* The frame looks like:
gregs [REG_RIP] = (unsigned long)altstack_handle_and_restore;
gregs [REG_RSP] = (unsigned long)(sp - 1);
gregs [REG_RDI] = (unsigned long)(sp + 4);
- gregs [REG_RSI] = 0;
- gregs [REG_RDX] = 0;
+ gregs [REG_RSI] = (guint64)exc;
+ gregs [REG_RDX] = stack_ovf;
#endif
}
+static guint64
+get_original_ip (void)
+{
+ MonoLMF *lmf = mono_get_lmf ();
+
+ g_assert (lmf);
+
+ /* Reset the change to previous_lmf */
+ lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf & ~1);
+
+ return lmf->rip;
+}
+
+static gpointer
+get_throw_pending_exception (void)
+{
+ static guint8* start;
+ static gboolean inited = FALSE;
+ guint8 *code;
+ guint8 *br[1];
+ gpointer throw_trampoline;
+
+ if (inited)
+ return start;
+
+ start = code = mono_global_codeman_reserve (128);
+
+ /* We are in the frame of a managed method after a call */
+ /*
+ * We would like to throw the pending exception in such a way that it looks to
+ * be thrown from the managed method.
+ */
+
+ /* Save registers which might contain the return value of the call */
+ amd64_push_reg (code, AMD64_RAX);
+ amd64_push_reg (code, AMD64_RDX);
+
+ amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
+ amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
+
+ /* Align stack */
+ amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
+
+ /* Obtain the pending exception */
+ amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
+ amd64_call_reg (code, AMD64_R11);
+
+ /* Check if it is NULL, and branch */
+ amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
+ br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
+
+ /* exc != NULL branch */
+
+ /* Save the exc on the stack */
+ amd64_push_reg (code, AMD64_RAX);
+ /* Align stack */
+ amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
+
+ /* Obtain the original ip and clear the flag in previous_lmf */
+ amd64_mov_reg_imm (code, AMD64_R11, get_original_ip);
+ amd64_call_reg (code, AMD64_R11);
+
+ /* Load exc */
+ amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
+
+ /* Pop saved stuff from the stack */
+ amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
+
+ /* Setup arguments for the throw trampoline */
+ /* Exception */
+ amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
+ /* The trampoline expects the caller ip to be pushed on the stack */
+ amd64_push_reg (code, AMD64_RAX);
+
+ /* Call the throw trampoline */
+ throw_trampoline = mono_get_throw_exception ();
+ amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
+ /* We use a jump instead of a call so we can push the original ip on the stack */
+ amd64_jump_reg (code, AMD64_R11);
+
+ /* ex == NULL branch */
+ mono_amd64_patch (br [0], code);
+
+ /* Obtain the original ip and clear the flag in previous_lmf */
+ amd64_mov_reg_imm (code, AMD64_R11, get_original_ip);
+ amd64_call_reg (code, AMD64_R11);
+ amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
+
+ /* Restore registers */
+ amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
+ amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
+ amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
+ amd64_pop_reg (code, AMD64_RDX);
+ amd64_pop_reg (code, AMD64_RAX);
+
+ /* Return to original code */
+ amd64_jump_reg (code, AMD64_R11);
+
+ g_assert ((code - start) < 128);
+
+ inited = TRUE;
+
+ return start;
+}
+
+/*
+ * Called when a thread receives an async exception while executing unmanaged code.
+ * Instead of checking for this exception in the managed-to-native wrapper, we hijack
+ * the return address on the stack to point to a helper routine which throws the
+ * exception.
+ */
+void
+mono_arch_notify_pending_exc (void)
+{
+ MonoLMF *lmf = mono_get_lmf ();
+
+ if (lmf->rsp == 0)
+ /* Initial LMF */
+ return;
+
+ if ((guint64)lmf->previous_lmf & 1)
+ /* Already hijacked or trampoline LMF entry */
+ return;
+
+ /* lmf->rsp is set just before making the call which transitions to unmanaged code */
+ lmf->rip = *(guint64*)(lmf->rsp - 8);
+ /* Signal that lmf->rip is set */
+ lmf->previous_lmf = (gpointer)((guint64)lmf->previous_lmf | 1);
+
+ *(gpointer*)(lmf->rsp - 8) = get_throw_pending_exception ();
+}
+
+#ifdef PLATFORM_WIN32
+
+/*
+ * The mono_arch_unwindinfo* methods are used to build and add
+ * function table info for each emitted method from mono. On Winx64
+ * the seh handler will not be called if the mono methods are not
+ * added to the function table.
+ *
+ * We should not need to add non-volatile register info to the
+ * table since mono stores that info elsewhere. (Except for the register
+ * used for the fp.)
+ */
+
+#define MONO_MAX_UNWIND_CODES 22
+
+typedef union _UNWIND_CODE {
+ struct {
+ guchar CodeOffset;
+ guchar UnwindOp : 4;
+ guchar OpInfo : 4;
+ };
+ gushort FrameOffset;
+} UNWIND_CODE, *PUNWIND_CODE;
+
+typedef struct _UNWIND_INFO {
+ guchar Version : 3;
+ guchar Flags : 5;
+ guchar SizeOfProlog;
+ guchar CountOfCodes;
+ guchar FrameRegister : 4;
+ guchar FrameOffset : 4;
+ /* custom size for mono allowing for mono allowing for*/
+ /*UWOP_PUSH_NONVOL ebp offset = 21*/
+ /*UWOP_ALLOC_LARGE : requires 2 or 3 offset = 20*/
+ /*UWOP_SET_FPREG : requires 2 offset = 17*/
+ /*UWOP_PUSH_NONVOL offset = 15-0*/
+ UNWIND_CODE UnwindCode[MONO_MAX_UNWIND_CODES];
+
+/* UNWIND_CODE MoreUnwindCode[((CountOfCodes + 1) & ~1) - 1];
+ * union {
+ * OPTIONAL ULONG ExceptionHandler;
+ * OPTIONAL ULONG FunctionEntry;
+ * };
+ * OPTIONAL ULONG ExceptionData[]; */
+} UNWIND_INFO, *PUNWIND_INFO;
+
+typedef struct
+{
+ RUNTIME_FUNCTION runtimeFunction;
+ UNWIND_INFO unwindInfo;
+} MonoUnwindInfo, *PMonoUnwindInfo;
+
+static void
+mono_arch_unwindinfo_create (gpointer* monoui)
+{
+ PMonoUnwindInfo newunwindinfo;
+ *monoui = newunwindinfo = g_new0 (MonoUnwindInfo, 1);
+ newunwindinfo->unwindInfo.Version = 1;
+}
+
+void
+mono_arch_unwindinfo_add_push_nonvol (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
+{
+ PMonoUnwindInfo unwindinfo;
+ PUNWIND_CODE unwindcode;
+ guchar codeindex;
+ if (!*monoui)
+ mono_arch_unwindinfo_create (monoui);
+
+ unwindinfo = (MonoUnwindInfo*)*monoui;
+
+ if (unwindinfo->unwindInfo.CountOfCodes >= MONO_MAX_UNWIND_CODES)
+ g_error ("Larger allocation needed for the unwind information.");
+
+ codeindex = MONO_MAX_UNWIND_CODES - (++unwindinfo->unwindInfo.CountOfCodes);
+ unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
+ unwindcode->UnwindOp = 0; /*UWOP_PUSH_NONVOL*/
+ unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
+ unwindcode->OpInfo = reg;
+
+ if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
+ g_error ("Adding unwind info in wrong order.");
+
+ unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
+}
+
+void
+mono_arch_unwindinfo_add_set_fpreg (gpointer* monoui, gpointer codebegin, gpointer nextip, guchar reg )
+{
+ PMonoUnwindInfo unwindinfo;
+ PUNWIND_CODE unwindcode;
+ guchar codeindex;
+ if (!*monoui)
+ mono_arch_unwindinfo_create (monoui);
+
+ unwindinfo = (MonoUnwindInfo*)*monoui;
+
+ if (unwindinfo->unwindInfo.CountOfCodes + 1 >= MONO_MAX_UNWIND_CODES)
+ g_error ("Larger allocation needed for the unwind information.");
+
+ codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += 2);
+ unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
+ unwindcode->FrameOffset = 0; /*Assuming no frame pointer offset for mono*/
+ unwindcode++;
+ unwindcode->UnwindOp = 3; /*UWOP_SET_FPREG*/
+ unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
+ unwindcode->OpInfo = reg;
+
+ unwindinfo->unwindInfo.FrameRegister = reg;
+
+ if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
+ g_error ("Adding unwind info in wrong order.");
+
+ unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
+}
+
+void
+mono_arch_unwindinfo_add_alloc_stack (gpointer* monoui, gpointer codebegin, gpointer nextip, guint size )
+{
+ PMonoUnwindInfo unwindinfo;
+ PUNWIND_CODE unwindcode;
+ guchar codeindex;
+ guchar codesneeded;
+ if (!*monoui)
+ mono_arch_unwindinfo_create (monoui);
+
+ unwindinfo = (MonoUnwindInfo*)*monoui;
+
+ if (size < 0x8)
+ g_error ("Stack allocation must be equal to or greater than 0x8.");
+
+ if (size <= 0x80)
+ codesneeded = 1;
+ else if (size <= 0x7FFF8)
+ codesneeded = 2;
+ else
+ codesneeded = 3;
+
+ if (unwindinfo->unwindInfo.CountOfCodes + codesneeded > MONO_MAX_UNWIND_CODES)
+ g_error ("Larger allocation needed for the unwind information.");
+
+ codeindex = MONO_MAX_UNWIND_CODES - (unwindinfo->unwindInfo.CountOfCodes += codesneeded);
+ unwindcode = &unwindinfo->unwindInfo.UnwindCode[codeindex];
+
+ if (codesneeded == 1) {
+ /*The size of the allocation is
+ (the number in the OpInfo member) times 8 plus 8*/
+ unwindcode->OpInfo = (size - 8)/8;
+ unwindcode->UnwindOp = 2; /*UWOP_ALLOC_SMALL*/
+ }
+ else {
+ if (codesneeded == 3) {
+ /*the unscaled size of the allocation is recorded
+ in the next two slots in little-endian format*/
+ *((unsigned int*)(&unwindcode->FrameOffset)) = size;
+ unwindcode += 2;
+ unwindcode->OpInfo = 1;
+ }
+ else {
+ /*the size of the allocation divided by 8
+ is recorded in the next slot*/
+ unwindcode->FrameOffset = size/8;
+ unwindcode++;
+ unwindcode->OpInfo = 0;
+
+ }
+ unwindcode->UnwindOp = 1; /*UWOP_ALLOC_LARGE*/
+ }
+
+ unwindcode->CodeOffset = (((guchar*)nextip)-((guchar*)codebegin));
+
+ if (unwindinfo->unwindInfo.SizeOfProlog >= unwindcode->CodeOffset)
+ g_error ("Adding unwind info in wrong order.");
+
+ unwindinfo->unwindInfo.SizeOfProlog = unwindcode->CodeOffset;
+}
+
+guint
+mono_arch_unwindinfo_get_size (gpointer monoui)
+{
+ PMonoUnwindInfo unwindinfo;
+ if (!monoui)
+ return 0;
+
+ unwindinfo = (MonoUnwindInfo*)monoui;
+ return (8 + sizeof (MonoUnwindInfo)) -
+ (sizeof (UNWIND_CODE) * (MONO_MAX_UNWIND_CODES - unwindinfo->unwindInfo.CountOfCodes));
+}
+
+void
+mono_arch_unwindinfo_install_unwind_info (gpointer* monoui, gpointer code, guint code_size)
+{
+ PMonoUnwindInfo unwindinfo, targetinfo;
+ guchar codecount;
+ guint64 targetlocation;
+ if (!*monoui)
+ return;
+
+ unwindinfo = (MonoUnwindInfo*)*monoui;
+ targetlocation = (guint64)&(((guchar*)code)[code_size]);
+ targetinfo = (PMonoUnwindInfo) ALIGN_TO(targetlocation, 8);
+
+ unwindinfo->runtimeFunction.EndAddress = code_size;
+ unwindinfo->runtimeFunction.UnwindData = ((guchar*)&targetinfo->unwindInfo) - ((guchar*)code);
+
+ memcpy (targetinfo, unwindinfo, sizeof (MonoUnwindInfo) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));
+
+ codecount = unwindinfo->unwindInfo.CountOfCodes;
+ if (codecount) {
+ memcpy (&targetinfo->unwindInfo.UnwindCode[0], &unwindinfo->unwindInfo.UnwindCode[MONO_MAX_UNWIND_CODES-codecount],
+ sizeof (UNWIND_CODE) * unwindinfo->unwindInfo.CountOfCodes);
+ }
+
+ g_free (unwindinfo);
+ *monoui = 0;
+
+ RtlAddFunctionTable (&targetinfo->runtimeFunction, 1, (DWORD64)code);
+}
+
+#endif
+
+
+
projects / mono.git / blobdiff