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|
/**
* \file
* exception support for ARM64
*
* Copyright 2013 Xamarin Inc
*
* Based on exceptions-arm.c:
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
* Paolo Molaro (lupus@ximian.com)
*
* (C) 2001 Ximian, Inc.
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include "mini.h"
#include "mini-runtime.h"
#include "aot-runtime.h"
#include <mono/arch/arm64/arm64-codegen.h>
#include <mono/metadata/abi-details.h>
#ifndef DISABLE_JIT
gpointer
mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
{
guint8 *start, *code;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
int i, ctx_reg, size;
guint8 *labels [16];
size = 256;
code = start = mono_global_codeman_reserve (size);
arm_movx (code, ARMREG_IP0, ARMREG_R0);
ctx_reg = ARMREG_IP0;
/* Restore fregs */
arm_ldrx (code, ARMREG_IP1, ctx_reg, MONO_STRUCT_OFFSET (MonoContext, has_fregs));
labels [0] = code;
arm_cbzx (code, ARMREG_IP1, 0);
for (i = 0; i < 32; ++i)
arm_ldrfpx (code, i, ctx_reg, MONO_STRUCT_OFFSET (MonoContext, fregs) + (i * sizeof (MonoContextSimdReg)));
mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
/* Restore gregs */
// FIXME: Restore less registers
// FIXME: fp should be restored later
code = mono_arm_emit_load_regarray (code, 0xffffffff & ~(1 << ctx_reg) & ~(1 << ARMREG_SP), ctx_reg, MONO_STRUCT_OFFSET (MonoContext, regs));
/* ip0/ip1 doesn't need to be restored */
/* ip1 = pc */
arm_ldrx (code, ARMREG_IP1, ctx_reg, MONO_STRUCT_OFFSET (MonoContext, pc));
/* ip0 = sp */
arm_ldrx (code, ARMREG_IP0, ctx_reg, MONO_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
/* Restore sp, ctx is no longer valid */
arm_movspx (code, ARMREG_SP, ARMREG_IP0);
/* Branch to pc */
arm_brx (code, ARMREG_IP1);
/* Not reached */
arm_brk (code, 0);
g_assert ((code - start) < size);
mono_arch_flush_icache (start, code - start);
MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
if (info)
*info = mono_tramp_info_create ("restore_context", start, code - start, ji, unwind_ops);
return start;
}
gpointer
mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
{
guint8 *code;
guint8* start;
int i, size, offset, gregs_offset, fregs_offset, ctx_offset, num_fregs, frame_size;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
guint8 *labels [16];
size = 512;
start = code = mono_global_codeman_reserve (size);
/* Compute stack frame size and offsets */
offset = 0;
/* frame block */
offset += 2 * 8;
/* gregs */
gregs_offset = offset;
offset += 32 * 8;
/* fregs */
num_fregs = 8;
fregs_offset = offset;
offset += num_fregs * 8;
ctx_offset = offset;
ctx_offset += 8;
frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
/*
* We are being called from C code, ctx is in r0, the address to call is in r1.
* We need to save state, restore ctx, make the call, then restore the previous state,
* returning the value returned by the call.
*/
/* Setup a frame */
arm_stpx_pre (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, -frame_size);
arm_movspx (code, ARMREG_FP, ARMREG_SP);
/* Save ctx */
arm_strx (code, ARMREG_R0, ARMREG_FP, ctx_offset);
/* Save gregs */
code = mono_arm_emit_store_regarray (code, MONO_ARCH_CALLEE_SAVED_REGS | (1 << ARMREG_FP), ARMREG_FP, gregs_offset);
/* Save fregs */
for (i = 0; i < num_fregs; ++i)
arm_strfpx (code, ARMREG_D8 + i, ARMREG_FP, fregs_offset + (i * 8));
/* Load regs from ctx */
code = mono_arm_emit_load_regarray (code, MONO_ARCH_CALLEE_SAVED_REGS, ARMREG_R0, MONO_STRUCT_OFFSET (MonoContext, regs));
/* Load fregs */
arm_ldrx (code, ARMREG_IP0, ARMREG_R0, MONO_STRUCT_OFFSET (MonoContext, has_fregs));
labels [0] = code;
arm_cbzx (code, ARMREG_IP0, 0);
for (i = 0; i < num_fregs; ++i)
arm_ldrfpx (code, ARMREG_D8 + i, ARMREG_R0, MONO_STRUCT_OFFSET (MonoContext, fregs) + ((i + 8) * sizeof (MonoContextSimdReg)));
mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
/* Load fp */
arm_ldrx (code, ARMREG_FP, ARMREG_R0, MONO_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
/* Make the call */
arm_blrx (code, ARMREG_R1);
/* For filters, the result is in R0 */
/* Restore fp */
arm_ldrx (code, ARMREG_FP, ARMREG_SP, gregs_offset + (ARMREG_FP * 8));
/* Load ctx */
arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset);
/* Save registers back to ctx */
/* This isn't strictly neccessary since we don't allocate variables used in eh clauses to registers */
code = mono_arm_emit_store_regarray (code, MONO_ARCH_CALLEE_SAVED_REGS, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoContext, regs));
/* Restore regs */
code = mono_arm_emit_load_regarray (code, MONO_ARCH_CALLEE_SAVED_REGS, ARMREG_FP, gregs_offset);
/* Restore fregs */
for (i = 0; i < num_fregs; ++i)
arm_ldrfpx (code, ARMREG_D8 + i, ARMREG_FP, fregs_offset + (i * 8));
/* Destroy frame */
code = mono_arm_emit_destroy_frame (code, frame_size, (1 << ARMREG_IP0));
arm_retx (code, ARMREG_LR);
g_assert ((code - start) < size);
mono_arch_flush_icache (start, code - start);
MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
if (info)
*info = mono_tramp_info_create ("call_filter", start, code - start, ji, unwind_ops);
return start;
}
static gpointer
get_throw_trampoline (int size, gboolean corlib, gboolean rethrow, gboolean llvm, gboolean resume_unwind, const char *tramp_name, MonoTrampInfo **info, gboolean aot, gboolean preserve_ips)
{
guint8 *start, *code;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
int i, offset, gregs_offset, fregs_offset, frame_size, num_fregs;
code = start = mono_global_codeman_reserve (size);
/* We are being called by JITted code, the exception object/type token is in R0 */
/* Compute stack frame size and offsets */
offset = 0;
/* frame block */
offset += 2 * 8;
/* gregs */
gregs_offset = offset;
offset += 32 * 8;
/* fregs */
num_fregs = 8;
fregs_offset = offset;
offset += num_fregs * 8;
frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
/* Setup a frame */
arm_stpx_pre (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, -frame_size);
arm_movspx (code, ARMREG_FP, ARMREG_SP);
/* Save gregs */
code = mono_arm_emit_store_regarray (code, 0xffffffff, ARMREG_FP, gregs_offset);
if (corlib && !llvm)
/* The real LR is in R1 */
arm_strx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
/* Save fp/sp */
arm_ldrx (code, ARMREG_IP0, ARMREG_FP, 0);
arm_strx (code, ARMREG_IP0, ARMREG_FP, gregs_offset + (ARMREG_FP * 8));
arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, frame_size);
arm_strx (code, ARMREG_IP0, ARMREG_FP, gregs_offset + (ARMREG_SP * 8));
/* Save fregs */
for (i = 0; i < num_fregs; ++i)
arm_strfpx (code, ARMREG_D8 + i, ARMREG_FP, fregs_offset + (i * 8));
/* Call the C trampoline function */
/* Arg1 = exception object/type token */
arm_movx (code, ARMREG_R0, ARMREG_R0);
/* Arg2 = caller ip */
if (corlib) {
if (llvm)
arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
else
arm_movx (code, ARMREG_R1, ARMREG_R1);
} else {
arm_ldrx (code, ARMREG_R1, ARMREG_FP, 8);
}
/* Arg 3 = gregs */
arm_addx_imm (code, ARMREG_R2, ARMREG_FP, gregs_offset);
/* Arg 4 = fregs */
arm_addx_imm (code, ARMREG_R3, ARMREG_FP, fregs_offset);
/* Arg 5 = corlib */
arm_movzx (code, ARMREG_R4, corlib ? 1 : 0, 0);
/* Arg 6 = rethrow */
arm_movzx (code, ARMREG_R5, rethrow ? 1 : 0, 0);
if (!resume_unwind) {
/* Arg 7 = preserve_ips */
arm_movzx (code, ARMREG_R6, preserve_ips ? 1 : 0, 0);
}
/* Call the function */
if (aot) {
const char *icall_name;
if (resume_unwind)
icall_name = "mono_arm_resume_unwind";
else
icall_name = "mono_arm_throw_exception";
code = mono_arm_emit_aotconst (&ji, code, start, ARMREG_LR, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
} else {
gpointer icall_func;
if (resume_unwind)
icall_func = (gpointer)mono_arm_resume_unwind;
else
icall_func = (gpointer)mono_arm_throw_exception;
code = mono_arm_emit_imm64 (code, ARMREG_LR, (guint64)icall_func);
}
arm_blrx (code, ARMREG_LR);
/* This shouldn't return */
arm_brk (code, 0x0);
g_assert ((code - start) < size);
mono_arch_flush_icache (start, code - start);
MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
if (info)
*info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
return start;
}
gpointer
mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
{
return get_throw_trampoline (256, FALSE, FALSE, FALSE, FALSE, "throw_exception", info, aot, FALSE);
}
gpointer
mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
{
return get_throw_trampoline (256, FALSE, TRUE, FALSE, FALSE, "rethrow_exception", info, aot, FALSE);
}
gpointer
mono_arch_get_rethrow_preserve_exception (MonoTrampInfo **info, gboolean aot)
{
return get_throw_trampoline (256, FALSE, TRUE, FALSE, FALSE, "rethrow_preserve_exception", info, aot, TRUE);
}
gpointer
mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
{
return get_throw_trampoline (256, TRUE, FALSE, FALSE, FALSE, "throw_corlib_exception", info, aot, FALSE);
}
GSList*
mono_arm_get_exception_trampolines (gboolean aot)
{
MonoTrampInfo *info;
GSList *tramps = NULL;
/* LLVM uses the normal trampolines, but with a different name */
get_throw_trampoline (256, TRUE, FALSE, FALSE, FALSE, "llvm_throw_corlib_exception_trampoline", &info, aot, FALSE);
tramps = g_slist_prepend (tramps, info);
get_throw_trampoline (256, TRUE, FALSE, TRUE, FALSE, "llvm_throw_corlib_exception_abs_trampoline", &info, aot, FALSE);
tramps = g_slist_prepend (tramps, info);
get_throw_trampoline (256, FALSE, FALSE, FALSE, TRUE, "llvm_resume_unwind_trampoline", &info, aot, FALSE);
tramps = g_slist_prepend (tramps, info);
return tramps;
}
#else /* DISABLE_JIT */
gpointer
mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
GSList*
mono_arm_get_exception_trampolines (gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
#endif /* !DISABLE_JIT */
void
mono_arch_exceptions_init (void)
{
gpointer tramp;
GSList *tramps, *l;
if (mono_aot_only) {
tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_trampoline");
mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_trampoline", NULL, TRUE);
tramp = mono_aot_get_trampoline ("llvm_throw_corlib_exception_abs_trampoline");
mono_register_jit_icall (tramp, "llvm_throw_corlib_exception_abs_trampoline", NULL, TRUE);
tramp = mono_aot_get_trampoline ("llvm_resume_unwind_trampoline");
mono_register_jit_icall (tramp, "llvm_resume_unwind_trampoline", NULL, TRUE);
} else {
tramps = mono_arm_get_exception_trampolines (FALSE);
for (l = tramps; l; l = l->next) {
MonoTrampInfo *info = (MonoTrampInfo*)l->data;
mono_register_jit_icall (info->code, g_strdup (info->name), NULL, TRUE);
mono_tramp_info_register (info, NULL);
}
g_slist_free (tramps);
}
}
/*
* mono_arm_throw_exception:
*
* This function is called by the exception trampolines.
* FP_REGS points to the 8 callee saved fp regs.
*/
void
mono_arm_throw_exception (gpointer arg, mgreg_t pc, mgreg_t *int_regs, gdouble *fp_regs, gboolean corlib, gboolean rethrow, gboolean preserve_ips)
{
ERROR_DECL (error);
MonoContext ctx;
MonoObject *exc = NULL;
guint32 ex_token_index, ex_token;
if (!corlib)
exc = (MonoObject*)arg;
else {
ex_token_index = (guint64)arg;
ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
exc = (MonoObject*)mono_exception_from_token (mono_defaults.corlib, ex_token);
}
/* Adjust pc so it points into the call instruction */
pc -= 4;
/* Initialize a ctx based on the arguments */
memset (&ctx, 0, sizeof (MonoContext));
memcpy (&(ctx.regs [0]), int_regs, sizeof (mgreg_t) * 32);
for (int i = 0; i < 8; i++)
*((gdouble*)&ctx.fregs [ARMREG_D8 + i]) = fp_regs [i];
ctx.has_fregs = 1;
ctx.pc = pc;
if (mono_object_isinst_checked (exc, mono_defaults.exception_class, error)) {
MonoException *mono_ex = (MonoException*)exc;
if (!rethrow) {
mono_ex->stack_trace = NULL;
mono_ex->trace_ips = NULL;
} else if (preserve_ips) {
mono_ex->caught_in_unmanaged = TRUE;
}
}
mono_error_assert_ok (error);
mono_handle_exception (&ctx, exc);
mono_restore_context (&ctx);
}
void
mono_arm_resume_unwind (gpointer arg, mgreg_t pc, mgreg_t *int_regs, gdouble *fp_regs, gboolean corlib, gboolean rethrow)
{
MonoContext ctx;
/* Adjust pc so it points into the call instruction */
pc -= 4;
/* Initialize a ctx based on the arguments */
memset (&ctx, 0, sizeof (MonoContext));
memcpy (&(ctx.regs [0]), int_regs, sizeof (mgreg_t) * 32);
for (int i = 0; i < 8; i++)
*((gdouble*)&ctx.fregs [ARMREG_D8 + i]) = fp_regs [i];
ctx.has_fregs = 1;
ctx.pc = pc;
mono_resume_unwind (&ctx);
}
/*
* mono_arch_unwind_frame:
*
* See exceptions-amd64.c for docs;
*/
gboolean
mono_arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *ji, MonoContext *ctx,
MonoContext *new_ctx, MonoLMF **lmf,
mgreg_t **save_locations,
StackFrameInfo *frame)
{
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
memset (frame, 0, sizeof (StackFrameInfo));
frame->ji = ji;
*new_ctx = *ctx;
if (ji != NULL) {
mgreg_t regs [MONO_MAX_IREGS + 8 + 1];
guint8 *cfa;
guint32 unwind_info_len;
guint8 *unwind_info;
if (ji->is_trampoline)
frame->type = FRAME_TYPE_TRAMPOLINE;
else
frame->type = FRAME_TYPE_MANAGED;
unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
memcpy (regs, &new_ctx->regs, sizeof (mgreg_t) * 32);
/* v8..v15 are callee saved */
for (int i = 0; i < 8; i++)
(regs + MONO_MAX_IREGS) [i] = *((mgreg_t*)&new_ctx->fregs [8 + i]);
mono_unwind_frame (unwind_info, unwind_info_len, (guint8*)ji->code_start,
(guint8*)ji->code_start + ji->code_size,
(guint8*)ip, NULL, regs, MONO_MAX_IREGS + 8,
save_locations, MONO_MAX_IREGS, (guint8**)&cfa);
memcpy (&new_ctx->regs, regs, sizeof (mgreg_t) * 32);
for (int i = 0; i < 8; i++)
*((mgreg_t*)&new_ctx->fregs [8 + i]) = (regs + MONO_MAX_IREGS) [i];
new_ctx->pc = regs [ARMREG_LR];
new_ctx->regs [ARMREG_SP] = (mgreg_t)cfa;
if (*lmf && (*lmf)->gregs [MONO_ARCH_LMF_REG_SP] && (MONO_CONTEXT_GET_SP (ctx) >= (gpointer)(*lmf)->gregs [MONO_ARCH_LMF_REG_SP])) {
/* remove any unused lmf */
*lmf = (MonoLMF*)(((gsize)(*lmf)->previous_lmf) & ~3);
}
/* we substract 1, so that the IP points into the call instruction */
new_ctx->pc--;
return TRUE;
} else if (*lmf) {
g_assert ((((guint64)(*lmf)->previous_lmf) & 2) == 0);
frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
ji = mini_jit_info_table_find (domain, (gpointer)(*lmf)->pc, NULL);
if (!ji)
return FALSE;
g_assert (MONO_ARCH_LMF_REGS == ((0x3ff << 19) | (1 << ARMREG_FP) | (1 << ARMREG_SP)));
memcpy (&new_ctx->regs [ARMREG_R19], &(*lmf)->gregs [0], sizeof (mgreg_t) * 10);
new_ctx->regs [ARMREG_FP] = (*lmf)->gregs [MONO_ARCH_LMF_REG_FP];
new_ctx->regs [ARMREG_SP] = (*lmf)->gregs [MONO_ARCH_LMF_REG_SP];
new_ctx->pc = (*lmf)->pc;
/* we substract 1, so that the IP points into the call instruction */
new_ctx->pc--;
*lmf = (MonoLMF*)(((gsize)(*lmf)->previous_lmf) & ~3);
return TRUE;
}
return FALSE;
}
/*
* handle_exception:
*
* Called by resuming from a signal handler.
*/
static void
handle_signal_exception (gpointer obj)
{
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoContext ctx;
memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
mono_handle_exception (&ctx, (MonoObject*)obj);
mono_restore_context (&ctx);
}
/*
* This is the function called from the signal handler
*/
gboolean
mono_arch_handle_exception (void *ctx, gpointer obj)
{
#if defined(MONO_CROSS_COMPILE)
g_assert_not_reached ();
#else
MonoJitTlsData *jit_tls;
void *sigctx = ctx;
/*
* Resume into the normal stack and handle the exception there.
*/
jit_tls = mono_tls_get_jit_tls ();
/* Pass the ctx parameter in TLS */
mono_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
/* The others in registers */
UCONTEXT_REG_R0 (sigctx) = (gsize)obj;
UCONTEXT_REG_PC (sigctx) = (gsize)handle_signal_exception;
UCONTEXT_REG_SP (sigctx) = UCONTEXT_REG_SP (sigctx) - MONO_ARCH_REDZONE_SIZE;
#endif
return TRUE;
}
gpointer
mono_arch_ip_from_context (void *sigctx)
{
#ifdef MONO_CROSS_COMPILE
g_assert_not_reached ();
return NULL;
#else
return (gpointer)UCONTEXT_REG_PC (sigctx);
#endif
}
void
mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
{
mgreg_t sp = (mgreg_t)MONO_CONTEXT_GET_SP (ctx);
// FIXME:
g_assert (!user_data);
/* Allocate a stack frame */
sp -= 32;
MONO_CONTEXT_SET_SP (ctx, sp);
mono_arch_setup_resume_sighandler_ctx (ctx, (gpointer)async_cb);
}
/*
* mono_arch_setup_resume_sighandler_ctx:
*
* Setup CTX so execution continues at FUNC.
*/
void
mono_arch_setup_resume_sighandler_ctx (MonoContext *ctx, gpointer func)
{
MONO_CONTEXT_SET_IP (ctx,func);
}
void
mono_arch_undo_ip_adjustment (MonoContext *ctx)
{
ctx->pc++;
}
void
mono_arch_do_ip_adjustment (MonoContext *ctx)
{
ctx->pc--;
}
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