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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2020-2023. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "beam_asm.hpp"
extern "C"
{
#include "beam_common.h"
#include "erl_bif_table.h"
#include "beam_bp.h"
};
/* This function is jumped to from the export entry of a function.
*
* ARG1 = export entry */
void BeamGlobalAssembler::emit_generic_bp_global() {
/* Enter an Erlang frame to make the stack consistent with local
* breakpoints. */
emit_enter_erlang_frame();
lea(ARG2, arm::Mem(ARG1, offsetof(Export, info)));
emit_enter_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
a.mov(ARG1, c_p);
/* ARG2 is already set above */
load_x_reg_array(ARG3);
runtime_call<3>(erts_generic_breakpoint);
emit_leave_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
/* This is technically a tail call so we must leave the current frame
* before jumping. Note that we might not leave the frame we entered
* earlier in this function, but one added by erts_generic_breakpoint. */
emit_leave_erlang_frame();
a.br(ARG1);
}
/* This function is called from the module header, which is in turn called from
* the prologue of the traced function. As such, the real return address is at
* SP+8 rather than LR (x30).
*
* See beam_asm.h for more details */
void BeamGlobalAssembler::emit_generic_bp_local() {
a.ldr(ARG2, arm::Mem(a64::sp, 8));
/* Stash return address for later use in `debug_bp` */
a.str(ARG2, TMP_MEM1q);
/* Our actual return address is valid (and word-aligned), but it points
* just after the trampoline word so we'll need to skip that to find our
* ErtsCodeInfo. */
a.sub(ARG2, ARG2, imm(BEAM_ASM_FUNC_PROLOGUE_SIZE + sizeof(ErtsCodeInfo)));
emit_enter_runtime_frame();
emit_enter_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
a.mov(ARG1, c_p);
/* ARG2 is already set above */
load_x_reg_array(ARG3);
runtime_call<3>(erts_generic_breakpoint);
emit_leave_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
a.cmp(ARG1, imm(BeamOpCodeAddr(op_i_debug_breakpoint)));
a.b_eq(labels[debug_bp]);
emit_leave_runtime_frame();
a.ret(a64::x30);
}
/* This function is called from the module header which is called from the
* prologue of the function to trace. See beam_asm.h for more details
*
* The only place that we can come to here is from generic_bp_local */
void BeamGlobalAssembler::emit_debug_bp() {
Label error = a.newLabel();
/* Read and adjust the return address we saved in generic_bp_local. */
a.ldr(ARG2, TMP_MEM1q);
a.sub(ARG2, ARG2, imm(BEAM_ASM_FUNC_PROLOGUE_SIZE + sizeof(ErtsCodeMFA)));
emit_enter_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
a.mov(ARG1, c_p);
load_x_reg_array(ARG3);
a.mov(ARG4, imm(am_breakpoint));
runtime_call<4>(call_error_handler);
emit_leave_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>();
/* We skip two runtime frames (ours and the one entered in the module
* header) so that we can call the error handler's code instead of
* `call_nif_early`, if necessary. */
emit_leave_runtime_frame();
emit_leave_runtime_frame();
a.cbz(ARG1, error);
emit_leave_erlang_frame();
branch(emit_setup_dispatchable_call(ARG1));
a.bind(error);
{
a.ldr(ARG2, TMP_MEM1q);
mov_imm(ARG4, 0);
a.b(labels[raise_exception_shared]);
}
}
static void return_trace(Process *c_p,
ErtsCodeMFA *mfa,
Eterm val,
ErtsTracer *tracer) {
ERTS_UNREQ_PROC_MAIN_LOCK(c_p);
erts_trace_return(c_p, mfa, val, tracer);
ERTS_REQ_PROC_MAIN_LOCK(c_p);
}
void BeamModuleAssembler::emit_return_trace() {
a.ldr(ARG2, getYRef(0));
a.mov(ARG3, XREG0);
lea(ARG4, getYRef(1));
ERTS_CT_ASSERT(ERTS_HIGHEST_CALLEE_SAVE_XREG >= 1);
emit_enter_runtime<Update::eStack | Update::eHeap>(1);
a.mov(ARG1, c_p);
runtime_call<4>(return_trace);
emit_leave_runtime<Update::eStack | Update::eHeap>(1);
emit_deallocate(ArgVal(ArgVal::Word, 2));
emit_return();
}
void BeamModuleAssembler::emit_i_return_time_trace() {
/* Pass prev_info if present (is a CP), otherwise null. */
a.ldr(ARG2, getYRef(0));
mov_imm(ARG3, 0);
a.tst(ARG2, imm(_CPMASK));
a.sub(ARG2, ARG2, imm(sizeof(ErtsCodeInfo)));
a.csel(ARG2, ARG2, ARG3, arm::CondCode::kEQ);
ERTS_CT_ASSERT(ERTS_HIGHEST_CALLEE_SAVE_XREG >= 1);
emit_enter_runtime<Update::eStack | Update::eHeap>(1);
a.mov(ARG1, c_p);
runtime_call<2>(erts_trace_time_return);
emit_leave_runtime<Update::eStack | Update::eHeap>(1);
emit_deallocate(ArgVal(ArgVal::Word, 1));
emit_return();
}
void BeamModuleAssembler::emit_i_return_to_trace() {
ERTS_CT_ASSERT(ERTS_HIGHEST_CALLEE_SAVE_XREG >= 1);
emit_enter_runtime<Update::eStack | Update::eHeap>(1);
a.mov(ARG1, c_p);
runtime_call<1>(beam_jit_return_to_trace);
emit_leave_runtime<Update::eStack | Update::eHeap>(1);
emit_deallocate(ArgVal(ArgVal::Word, 0));
emit_return();
}
void BeamModuleAssembler::emit_i_hibernate() {
Label error = a.newLabel();
emit_enter_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>(3);
a.mov(ARG1, c_p);
load_x_reg_array(ARG2);
runtime_call<2>(erts_hibernate);
emit_leave_runtime<Update::eStack | Update::eHeap | Update::eXRegs |
Update::eReductions>(3);
a.cbz(ARG1, error);
a.ldr(TMP1.w(), arm::Mem(c_p, offsetof(Process, flags)));
a.and_(TMP1, TMP1, imm(~F_HIBERNATE_SCHED));
a.str(TMP1.w(), arm::Mem(c_p, offsetof(Process, flags)));
a.b(resolve_fragment(ga->get_do_schedule(), disp128MB));
a.bind(error);
emit_raise_exception(&BIF_TRAP_EXPORT(BIF_hibernate_3)->info.mfa);
}
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