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/*
* tramp-arm64.c: JIT trampoline code for ARM64
*
* Copyright 2013 Xamarin Inc
*
* Based on tramp-arm.c:
*
* Authors:
* Paolo Molaro (lupus@ximian.com)
*
* (C) 2001-2003 Ximian, Inc.
* Copyright 2003-2011 Novell Inc
* Copyright 2011 Xamarin Inc
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include "mini.h"
#include "debugger-agent.h"
#include <mono/arch/arm64/arm64-codegen.h>
#include <mono/metadata/abi-details.h>
#define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
void
mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
{
mono_arm_patch (code_ptr - 4, addr, MONO_R_ARM64_BL);
mono_arch_flush_icache (code_ptr - 4, 4);
}
void
mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
{
guint32 ins;
guint64 slot_addr;
int disp;
/*
* Decode the address loaded by the PLT entry emitted by arch_emit_plt_entry () in
* aot-compiler.c
*/
/* adrp */
ins = ((guint32*)code) [0];
g_assert (((ins >> 24) & 0x1f) == 0x10);
disp = (((ins >> 5) & 0x7ffff) << 2) | ((ins >> 29) & 0x3);
/* FIXME: disp is signed */
g_assert ((disp >> 20) == 0);
slot_addr = ((guint64)code + (disp << 12)) & ~0xfff;
/* add x16, x16, :lo12:got */
ins = ((guint32*)code) [1];
g_assert (((ins >> 22) & 0x3) == 0);
slot_addr += (ins >> 10) & 0xfff;
/* ldr x16, [x16, <offset>] */
ins = ((guint32*)code) [2];
g_assert (((ins >> 24) & 0x3f) == 0x39);
slot_addr += ((ins >> 10) & 0xfff) * 8;
g_assert (*(guint64*)slot_addr);
*(gpointer*)slot_addr = addr;
}
guint8*
mono_arch_get_call_target (guint8 *code)
{
guint32 imm;
int disp;
code -= 4;
imm = *(guint32*)code;
/* Should be a bl */
g_assert (((imm >> 31) & 0x1) == 0x1);
g_assert (((imm >> 26) & 0x7) == 0x5);
disp = (imm & 0x3ffffff);
if ((disp >> 25) != 0)
/* Negative, sing extend to 32 bits */
disp = disp | 0xfc000000;
return code + (disp * 4);
}
guint32
mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
{
/* The offset is stored as the 5th word of the plt entry */
return ((guint32*)plt_entry) [4];
}
#ifndef DISABLE_JIT
guchar*
mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
{
guint8 *code, *buf, *tramp, *labels [16];
int i, buf_len, imm;
int frame_size, offset, gregs_offset, num_fregs, fregs_offset, arg_offset, lmf_offset, res_offset;
guint64 gregs_regset;
GSList *unwind_ops = NULL;
MonoJumpInfo *ji = NULL;
char *tramp_name;
buf_len = 768;
buf = code = mono_global_codeman_reserve (buf_len);
/*
* We are getting called by a specific trampoline, ip1 contains the trampoline argument.
*/
/* Compute stack frame size and offsets */
offset = 0;
/* frame block */
offset += 2 * 8;
/* gregs */
gregs_offset = offset;
offset += 32 * 8;
/* fregs */
// FIXME: Save 128 bits
/* Only have to save the argument regs */
num_fregs = 8;
fregs_offset = offset;
offset += num_fregs * 8;
/* arg */
arg_offset = offset;
offset += 8;
/* result */
res_offset = offset;
offset += 8;
/* LMF */
lmf_offset = offset;
offset += sizeof (MonoLMF);
//offset += 22 * 8;
frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
/* Setup stack frame */
imm = frame_size;
while (imm > 256) {
arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
imm -= 256;
}
arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
arm_movspx (code, ARMREG_FP, ARMREG_SP);
/* Save gregs */
// FIXME: Optimize this
gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, gregs_offset);
/* Save fregs */
for (i = 0; i < num_fregs; ++i)
arm_strfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
/* Save trampoline arg */
arm_strx (code, ARMREG_IP1, ARMREG_FP, arg_offset);
/* Setup LMF */
arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
code = mono_arm_emit_store_regset (code, MONO_ARCH_LMF_REGS, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs));
/* Save caller fp */
arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_FP * 8));
/* Save caller sp */
arm_movx (code, ARMREG_IP1, ARMREG_FP);
imm = frame_size;
while (imm > 256) {
arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
imm -= 256;
}
arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_SP * 8));
/* Save caller pc */
if (tramp_type == MONO_TRAMPOLINE_JUMP)
arm_movx (code, ARMREG_LR, ARMREG_RZR);
else
arm_ldrx (code, ARMREG_LR, ARMREG_FP, 8);
arm_strx (code, ARMREG_LR, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, pc));
/* Save LMF */
/* Similar to emit_save_lmf () */
if (aot) {
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
} else {
tramp = (guint8*)mono_get_lmf_addr;
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
}
arm_blrx (code, ARMREG_IP0);
/* r0 contains the address of the tls slot holding the current lmf */
/* ip0 = lmf */
arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
/* lmf->lmf_addr = lmf_addr */
arm_strx (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* lmf->previous_lmf = *lmf_addr */
arm_ldrx (code, ARMREG_IP1, ARMREG_R0, 0);
arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* *lmf_addr = lmf */
arm_strx (code, ARMREG_IP0, ARMREG_R0, 0);
/* Call the C trampoline function */
/* Arg 1 = gregs */
arm_addx_imm (code, ARMREG_R0, ARMREG_FP, gregs_offset);
/* Arg 2 = caller */
if (tramp_type == MONO_TRAMPOLINE_JUMP)
arm_movx (code, ARMREG_R1, ARMREG_RZR);
else
arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
/* Arg 3 = arg */
if (MONO_TRAMPOLINE_TYPE_HAS_ARG (tramp_type))
/* Passed in r0 */
arm_ldrx (code, ARMREG_R2, ARMREG_FP, gregs_offset + (ARMREG_R0 * 8));
else
arm_ldrx (code, ARMREG_R2, ARMREG_FP, arg_offset);
/* Arg 4 = trampoline addr */
arm_movx (code, ARMREG_R3, ARMREG_RZR);
if (aot) {
char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
} else {
tramp = (guint8*)mono_get_trampoline_func (tramp_type);
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
}
arm_blrx (code, ARMREG_IP0);
/* Save the result */
arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
/* Restore LMF */
/* Similar to emit_restore_lmf () */
/* Clobbers ip0/ip1 */
/* ip0 = lmf */
arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
/* ip1 = lmf->previous_lmf */
arm_ldrx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
/* ip0 = lmf->lmf_addr */
arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
/* *lmf_addr = previous_lmf */
arm_strx (code, ARMREG_IP1, ARMREG_IP0, 0);
/* Check for thread interruption */
/* This is not perf critical code so no need to check the interrupt flag */
if (aot) {
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint_noraise");
} else {
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
}
arm_blrx (code, ARMREG_IP0);
/* Check whenever there is an exception to be thrown */
labels [0] = code;
arm_cbnzx (code, ARMREG_R0, 0);
/* Normal case */
/* Restore gregs */
/* Only have to load the argument regs (r0..r8) and the rgctx reg */
code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
/* Restore fregs */
for (i = 0; i < num_fregs; ++i)
arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
/* Load the result */
arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
/* These trampolines return a value */
if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
arm_movx (code, ARMREG_R0, ARMREG_IP1);
/* Cleanup frame */
code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
arm_retx (code, ARMREG_LR);
else
arm_brx (code, ARMREG_IP1);
/* Exception case */
mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
/*
* We have an exception we want to throw in the caller's frame, so pop
* the trampoline frame and throw from the caller.
*/
code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
/* We are in the parent frame, the exception is in x0 */
/*
* EH is initialized after trampolines, so get the address of the variable
* which contains throw_exception, and load it from there.
*/
if (aot) {
/* Not really a jit icall */
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "throw_exception_addr");
} else {
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_throw_exception_addr ());
}
arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
/* lr contains the return address, the trampoline will use it as the throw site */
arm_brx (code, ARMREG_IP0);
g_assert ((code - buf) < buf_len);
mono_arch_flush_icache (buf, code - buf);
if (info) {
tramp_name = mono_get_generic_trampoline_name (tramp_type);
*info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
g_free (tramp_name);
}
return buf;
}
gpointer
mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
guint8 *code, *buf, *tramp;
int buf_len = 64;
/*
* Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
* Pass the argument in ip1, clobbering ip0.
*/
tramp = mono_get_trampoline_code (tramp_type);
buf = code = mono_global_codeman_reserve (buf_len);
code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
arm_brx (code, ARMREG_IP0);
g_assert ((code - buf) < buf_len);
mono_arch_flush_icache (buf, code - buf);
if (code_len)
*code_len = code - buf;
return buf;
}
gpointer
mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
guint8 *code, *start;
guint32 size = 32;
MonoDomain *domain = mono_domain_get ();
start = code = mono_domain_code_reserve (domain, size);
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
arm_addx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
arm_brx (code, ARMREG_IP0);
g_assert ((code - start) <= size);
mono_arch_flush_icache (start, code - start);
return start;
}
gpointer
mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
{
guint8 *code, *start;
guint32 buf_len = 32;
MonoDomain *domain = mono_domain_get ();
start = code = mono_domain_code_reserve (domain, buf_len);
code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)mrgctx);
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
arm_brx (code, ARMREG_IP0);
g_assert ((code - start) <= buf_len);
mono_arch_flush_icache (start, code - start);
return start;
}
gpointer
mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
{
guint8 *code, *buf;
int buf_size;
int i, depth, index, njumps;
gboolean is_mrgctx;
guint8 **rgctx_null_jumps;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
guint8 *tramp;
guint32 code_len;
is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
index = MONO_RGCTX_SLOT_INDEX (slot);
if (is_mrgctx)
index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
for (depth = 0; ; ++depth) {
int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
if (index < size - 1)
break;
index -= size - 1;
}
buf_size = 64 + 16 * depth;
code = buf = mono_global_codeman_reserve (buf_size);
rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
njumps = 0;
/* The vtable/mrgtx is in R0 */
g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
if (is_mrgctx) {
/* get mrgctx ptr */
arm_movx (code, ARMREG_IP1, ARMREG_R0);
} else {
/* load rgctx ptr from vtable */
code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
/* is the rgctx ptr null? */
/* if yes, jump to actual trampoline */
rgctx_null_jumps [njumps ++] = code;
arm_cbzx (code, ARMREG_IP1, 0);
}
for (i = 0; i < depth; ++i) {
/* load ptr to next array */
if (is_mrgctx && i == 0) {
code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
} else {
code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
}
/* is the ptr null? */
/* if yes, jump to actual trampoline */
rgctx_null_jumps [njumps ++] = code;
arm_cbzx (code, ARMREG_IP1, 0);
}
/* fetch slot */
code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (gpointer) * (index + 1));
/* is the slot null? */
/* if yes, jump to actual trampoline */
rgctx_null_jumps [njumps ++] = code;
arm_cbzx (code, ARMREG_IP1, 0);
/* otherwise return, result is in IP1 */
arm_movx (code, ARMREG_R0, ARMREG_IP1);
arm_brx (code, ARMREG_LR);
g_assert (njumps <= depth + 2);
for (i = 0; i < njumps; ++i)
mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
g_free (rgctx_null_jumps);
/* Slowpath */
/* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
/* The vtable/mrgctx is still in R0 */
if (aot) {
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
} else {
tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
}
arm_brx (code, ARMREG_IP0);
mono_arch_flush_icache (buf, code - buf);
g_assert (code - buf <= buf_size);
if (info) {
char *name = mono_get_rgctx_fetch_trampoline_name (slot);
*info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
g_free (name);
}
return buf;
}
gpointer
mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
{
guint8 *code, *buf;
int tramp_size;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
g_assert (aot);
tramp_size = 32;
code = buf = mono_global_codeman_reserve (tramp_size);
mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
// FIXME: Currently, we always go to the slow path.
/* Load trampoline addr */
arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, 8);
/* The vtable/mrgctx is in R0 */
g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
arm_brx (code, ARMREG_IP0);
mono_arch_flush_icache (buf, code - buf);
g_assert (code - buf <= tramp_size);
if (info)
*info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
return buf;
}
static gpointer
handler_block_trampoline_helper (gpointer *ptr)
{
MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
return jit_tls->handler_block_return_address;
}
gpointer
mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
{
guint8 *tramp;
guint8 *code, *buf;
int tramp_size = 64;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
g_assert (!aot);
code = buf = mono_global_codeman_reserve (tramp_size);
unwind_ops = NULL;
tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
/*
This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
*/
/*
* We are in a method frame after the call emitted by OP_CALL_HANDLER.
*/
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)handler_block_trampoline_helper);
/* Set it as the return address so the trampoline will return to it */
arm_movx (code, ARMREG_LR, ARMREG_IP0);
/* Call the trampoline */
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
arm_brx (code, ARMREG_IP0);
mono_arch_flush_icache (buf, code - buf);
mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
g_assert (code - buf <= tramp_size);
*info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
return buf;
}
/*
* mono_arch_create_sdb_trampoline:
*
* Return a trampoline which captures the current context, passes it to
* debugger_agent_single_step_from_context ()/debugger_agent_breakpoint_from_context (),
* then restores the (potentially changed) context.
*/
guint8*
mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
{
int tramp_size = 512;
int offset, imm, frame_size, ctx_offset;
guint64 gregs_regset;
guint8 *code, *buf;
GSList *unwind_ops = NULL;
MonoJumpInfo *ji = NULL;
code = buf = mono_global_codeman_reserve (tramp_size);
/* Compute stack frame size and offsets */
offset = 0;
/* frame block */
offset += 2 * 8;
/* MonoContext */
ctx_offset = offset;
offset += sizeof (MonoContext);
offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
frame_size = offset;
// FIXME: Unwind info
/* Setup stack frame */
imm = frame_size;
while (imm > 256) {
arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
imm -= 256;
}
arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
arm_movspx (code, ARMREG_FP, ARMREG_SP);
/* Initialize a MonoContext structure on the stack */
/* No need to save fregs */
gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
/* Save caller fp */
arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
/* Save caller sp */
arm_movx (code, ARMREG_IP1, ARMREG_FP);
imm = frame_size;
while (imm > 256) {
arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
imm -= 256;
}
arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
/* Save caller ip */
arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
/* Call the single step/breakpoint function in sdb */
/* Arg1 = ctx */
arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
if (aot) {
if (single_step)
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_single_step_from_context");
else
code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_breakpoint_from_context");
} else {
gpointer addr = single_step ? debugger_agent_single_step_from_context : debugger_agent_breakpoint_from_context;
code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
}
arm_blrx (code, ARMREG_IP0);
/* Restore ctx */
/* Save fp/pc into the frame block */
arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
arm_retx (code, ARMREG_LR);
mono_arch_flush_icache (code, code - buf);
g_assert (code - buf <= tramp_size);
const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
*info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
return buf;
}
#else /* DISABLE_JIT */
guchar*
mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
gpointer
mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
{
g_assert_not_reached ();
return NULL;
}
guint8*
mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
{
g_assert_not_reached ();
return NULL;
}
#endif /* !DISABLE_JIT */
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