mirror of
https://github.com/async-profiler/async-profiler.git
synced 2026-06-16 02:55:57 +00:00
Andrei Pangin
127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
/*
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* Copyright The async-profiler authors
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* SPDX-License-Identifier: Apache-2.0
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*/
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#if defined(__arm__) || defined(__thumb__)
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#include <errno.h>
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#include <string.h>
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#include "stackFrame.h"
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#include "vmStructs.h"
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uintptr_t& StackFrame::pc() {
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return (uintptr_t&)_ucontext->uc_mcontext.arm_pc;
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}
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uintptr_t& StackFrame::sp() {
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return (uintptr_t&)_ucontext->uc_mcontext.arm_sp;
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}
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uintptr_t& StackFrame::fp() {
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return (uintptr_t&)_ucontext->uc_mcontext.arm_fp;
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}
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uintptr_t& StackFrame::retval() {
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return (uintptr_t&)_ucontext->uc_mcontext.arm_r0;
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}
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uintptr_t StackFrame::link() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_lr;
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}
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uintptr_t StackFrame::arg0() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r0;
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}
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uintptr_t StackFrame::arg1() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r1;
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}
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uintptr_t StackFrame::arg2() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r2;
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}
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uintptr_t StackFrame::arg3() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r3;
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}
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uintptr_t StackFrame::jarg0() {
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// Unimplemented
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return 0;
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}
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uintptr_t StackFrame::method() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r9;
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}
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uintptr_t StackFrame::senderSP() {
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return (uintptr_t)_ucontext->uc_mcontext.arm_r4;
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}
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void StackFrame::ret() {
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pc() = link();
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}
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bool StackFrame::unwindStub(instruction_t* entry, const char* name, uintptr_t& pc, uintptr_t& sp, uintptr_t& fp) {
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instruction_t* ip = (instruction_t*)pc;
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if (ip == entry || *ip == 0xe12fff1e
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|| strncmp(name, "itable", 6) == 0
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|| strncmp(name, "vtable", 6) == 0
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|| strcmp(name, "InlineCacheBuffer") == 0)
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{
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pc = link();
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return true;
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}
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return false;
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}
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bool StackFrame::unwindCompiled(NMethod* nm, uintptr_t& pc, uintptr_t& sp, uintptr_t& fp) {
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instruction_t* ip = (instruction_t*)pc;
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instruction_t* entry = (instruction_t*)nm->entry();
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if (ip > entry && ip <= entry + 4 && (*ip & 0xffffff00) == 0xe24dd000) {
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// push {r11, lr}
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// mov r11, sp (optional)
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// -> sub sp, sp, #offs
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fp = ((uintptr_t*)sp)[0];
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pc = ((uintptr_t*)sp)[1];
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sp += 8;
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return true;
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} else if (*ip == 0xe8bd4800) {
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// add sp, sp, #offs
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// -> pop {r11, lr}
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fp = ((uintptr_t*)sp)[0];
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pc = ((uintptr_t*)sp)[1];
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sp += 8;
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return true;
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}
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pc = link();
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return true;
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}
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bool StackFrame::unwindAtomicStub(const void*& pc) {
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// Not needed
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return false;
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}
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void StackFrame::adjustSP(const void* entry, const void* pc, uintptr_t& sp) {
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// Not needed
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}
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bool StackFrame::skipFaultInstruction() {
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return false;
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}
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bool StackFrame::checkInterruptedSyscall() {
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return retval() == (uintptr_t)-EINTR;
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}
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bool StackFrame::isSyscall(instruction_t* pc) {
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// swi #0
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return *pc == 0xef000000;
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}
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#endif // defined(__arm__) || defined(__thumb__)
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