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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.
*
* RET = export entry */
void BeamGlobalAssembler::emit_generic_bp_global() {
emit_enter_frame();
emit_enter_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
a.mov(ARG1, c_p);
a.lea(ARG2, x86::qword_ptr(RET, offsetof(Export, info)));
load_x_reg_array(ARG3);
runtime_call<3>(erts_generic_breakpoint);
emit_leave_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
/* 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 this function, but one added by `erts_generic_breakpoint`. */
emit_leave_frame();
a.jmp(RET);
}
/* 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
* RSP+8.
*
* See beam_asm.h about more details */
void BeamGlobalAssembler::emit_generic_bp_local() {
emit_assert_erlang_stack();
#ifdef NATIVE_ERLANG_STACK
/* Since we've entered here on the Erlang stack, we need to stash our
* return addresses in case `erts_generic_breakpoint` pushes any trace
* frames.
*
* Note that both of these are return addresses even when frame pointers
* are enabled due to the way the breakpoint trampoline works. They must
* not be restored until we're ready to return to module code, lest we
* leave the stack in an inconsistent state. */
a.pop(TMP_MEM2q);
a.pop(ARG2);
#else
a.mov(ARG2, x86::qword_ptr(x86::rsp, 8));
#endif
a.mov(TMP_MEM1q, ARG2);
/* 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, imm(sizeof(UWord) + sizeof(ErtsCodeInfo)));
#ifdef DEBUG
{
Label next = a.newLabel();
/* Crash if our return address isn't word-aligned. */
a.test(ARG2, imm(sizeof(UWord) - 1));
a.je(next);
a.hlt();
a.bind(next);
}
#endif
emit_enter_frame();
emit_enter_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
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::eReductions | Update::eStack | Update::eHeap>();
/* This doesn't necessarily leave the frame entered above: see the
* corresponding comment in `generic_bp_global` */
emit_leave_frame();
a.cmp(RET, imm(BeamOpCodeAddr(op_i_debug_breakpoint)));
a.je(labels[debug_bp]);
/* Note that we don't restore our return addresses in the `debug_bp` case
* above, since it tail calls the error handler and thus never returns to
* module code or `call_nif_early`. */
#ifdef NATIVE_ERLANG_STACK
a.push(TMP_MEM1q);
a.push(TMP_MEM2q);
#endif
a.ret();
}
/* This function is called from the module header which is called from the
* prologue of the function to trace. See beam_asm.h about 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();
emit_assert_erlang_stack();
emit_enter_frame();
emit_enter_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
/* Read and adjust the return address we saved in generic_bp_local. */
a.mov(ARG2, TMP_MEM1q);
a.sub(ARG2, imm(sizeof(UWord)));
a.mov(ARG1, c_p);
a.lea(ARG2, x86::qword_ptr(ARG2, -(int)sizeof(ErtsCodeMFA)));
load_x_reg_array(ARG3);
a.mov(ARG4, imm(am_breakpoint));
runtime_call<4>(call_error_handler);
emit_leave_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
emit_leave_frame();
a.test(RET, RET);
a.je(error);
a.jmp(emit_setup_dispatchable_call(RET));
a.bind(error);
{
a.mov(ARG2, TMP_MEM1q);
a.jmp(labels[raise_exception]);
}
}
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.mov(ARG2, getYRef(0));
a.mov(ARG3, getXRef(0));
a.lea(ARG4, getYRef(1));
emit_enter_runtime<Update::eStack | Update::eHeap>();
a.mov(ARG1, c_p);
runtime_call<4>(return_trace);
emit_leave_runtime<Update::eStack | Update::eHeap>();
emit_deallocate(ArgWord(2));
emit_return();
}
void BeamModuleAssembler::emit_i_return_time_trace() {
/* Pass prev_info if present (is a CP), otherwise null. */
a.mov(ARG2, getYRef(0));
mov_imm(ARG3, 0);
a.test(ARG2, imm(_CPMASK));
a.lea(ARG2, x86::qword_ptr(ARG2, -(Sint)sizeof(ErtsCodeInfo)));
a.cmovnz(ARG2, ARG3);
emit_enter_runtime<Update::eStack | Update::eHeap>();
a.mov(ARG1, c_p);
runtime_call<2>(erts_trace_time_return);
emit_leave_runtime<Update::eStack | Update::eHeap>();
emit_deallocate(ArgWord(1));
emit_return();
}
void BeamModuleAssembler::emit_i_return_to_trace() {
emit_enter_runtime<Update::eStack | Update::eHeap>();
a.mov(ARG1, c_p);
runtime_call<1>(beam_jit_return_to_trace);
emit_leave_runtime<Update::eStack | Update::eHeap>();
/* Remove the zero-sized stack frame. (Will actually do nothing if
* the native stack is used.) */
emit_deallocate(ArgWord(0));
emit_return();
}
void BeamModuleAssembler::emit_i_hibernate() {
Label error = a.newLabel();
emit_enter_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
a.mov(ARG1, c_p);
load_x_reg_array(ARG2);
runtime_call<2>(erts_hibernate);
emit_leave_runtime<Update::eReductions | Update::eStack | Update::eHeap>();
a.test(RET, RET);
a.je(error);
a.mov(ARG1, x86::qword_ptr(c_p, offsetof(Process, flags)));
a.and_(ARG1, imm(~F_HIBERNATE_SCHED));
a.mov(x86::qword_ptr(c_p, offsetof(Process, flags)), ARG1);
a.jmp(resolve_fragment(ga->get_do_schedule()));
a.bind(error);
emit_raise_exception(&BIF_TRAP_EXPORT(BIF_hibernate_3)->info.mfa);
}
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