2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
625 lines
20 KiB
C++
625 lines
20 KiB
C++
//===-- StopInfoMachException.cpp -------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "StopInfoMachException.h"
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#if defined(__APPLE__)
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// Needed for the EXC_RESOURCE interpretation macros
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#include <kern/exc_resource.h>
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#endif
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#include "lldb/Breakpoint/Watchpoint.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Target/DynamicLoader.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadPlan.h"
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#include "lldb/Target/UnixSignals.h"
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#include "lldb/Utility/StreamString.h"
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using namespace lldb;
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using namespace lldb_private;
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const char *StopInfoMachException::GetDescription() {
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if (m_description.empty() && m_value != 0) {
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ExecutionContext exe_ctx(m_thread_wp.lock());
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Target *target = exe_ctx.GetTargetPtr();
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const llvm::Triple::ArchType cpu =
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target ? target->GetArchitecture().GetMachine()
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: llvm::Triple::UnknownArch;
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const char *exc_desc = NULL;
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const char *code_label = "code";
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const char *code_desc = NULL;
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const char *subcode_label = "subcode";
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const char *subcode_desc = NULL;
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#if defined(__APPLE__)
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char code_desc_buf[32];
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char subcode_desc_buf[32];
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#endif
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switch (m_value) {
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case 1: // EXC_BAD_ACCESS
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exc_desc = "EXC_BAD_ACCESS";
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subcode_label = "address";
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switch (cpu) {
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code) {
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case 0xd:
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code_desc = "EXC_I386_GPFLT";
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m_exc_data_count = 1;
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break;
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}
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break;
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case llvm::Triple::arm:
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case llvm::Triple::thumb:
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switch (m_exc_code) {
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case 0x101:
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code_desc = "EXC_ARM_DA_ALIGN";
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break;
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case 0x102:
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code_desc = "EXC_ARM_DA_DEBUG";
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break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code) {
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case 0x101:
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code_desc = "EXC_PPC_VM_PROT_READ";
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break;
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case 0x102:
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code_desc = "EXC_PPC_BADSPACE";
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break;
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case 0x103:
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code_desc = "EXC_PPC_UNALIGNED";
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break;
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}
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break;
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default:
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break;
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}
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break;
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case 2: // EXC_BAD_INSTRUCTION
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exc_desc = "EXC_BAD_INSTRUCTION";
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switch (cpu) {
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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if (m_exc_code == 1)
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code_desc = "EXC_I386_INVOP";
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code) {
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case 1:
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code_desc = "EXC_PPC_INVALID_SYSCALL";
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break;
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case 2:
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code_desc = "EXC_PPC_UNIPL_INST";
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break;
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case 3:
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code_desc = "EXC_PPC_PRIVINST";
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break;
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case 4:
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code_desc = "EXC_PPC_PRIVREG";
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break;
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case 5:
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code_desc = "EXC_PPC_TRACE";
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break;
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case 6:
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code_desc = "EXC_PPC_PERFMON";
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break;
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}
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break;
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case llvm::Triple::arm:
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case llvm::Triple::thumb:
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if (m_exc_code == 1)
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code_desc = "EXC_ARM_UNDEFINED";
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break;
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default:
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break;
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}
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break;
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case 3: // EXC_ARITHMETIC
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exc_desc = "EXC_ARITHMETIC";
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switch (cpu) {
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code) {
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case 1:
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code_desc = "EXC_I386_DIV";
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break;
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case 2:
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code_desc = "EXC_I386_INTO";
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break;
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case 3:
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code_desc = "EXC_I386_NOEXT";
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break;
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case 4:
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code_desc = "EXC_I386_EXTOVR";
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break;
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case 5:
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code_desc = "EXC_I386_EXTERR";
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break;
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case 6:
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code_desc = "EXC_I386_EMERR";
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break;
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case 7:
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code_desc = "EXC_I386_BOUND";
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break;
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case 8:
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code_desc = "EXC_I386_SSEEXTERR";
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break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code) {
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case 1:
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code_desc = "EXC_PPC_OVERFLOW";
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break;
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case 2:
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code_desc = "EXC_PPC_ZERO_DIVIDE";
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break;
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case 3:
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code_desc = "EXC_PPC_FLT_INEXACT";
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break;
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case 4:
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code_desc = "EXC_PPC_FLT_ZERO_DIVIDE";
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break;
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case 5:
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code_desc = "EXC_PPC_FLT_UNDERFLOW";
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break;
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case 6:
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code_desc = "EXC_PPC_FLT_OVERFLOW";
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break;
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case 7:
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code_desc = "EXC_PPC_FLT_NOT_A_NUMBER";
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break;
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}
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break;
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default:
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break;
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}
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break;
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case 4: // EXC_EMULATION
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exc_desc = "EXC_EMULATION";
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break;
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case 5: // EXC_SOFTWARE
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exc_desc = "EXC_SOFTWARE";
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if (m_exc_code == 0x10003) {
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subcode_desc = "EXC_SOFT_SIGNAL";
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subcode_label = "signo";
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}
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break;
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case 6: // EXC_BREAKPOINT
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{
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exc_desc = "EXC_BREAKPOINT";
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switch (cpu) {
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (m_exc_code) {
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case 1:
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code_desc = "EXC_I386_SGL";
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break;
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case 2:
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code_desc = "EXC_I386_BPT";
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break;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (m_exc_code) {
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case 1:
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code_desc = "EXC_PPC_BREAKPOINT";
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break;
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}
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break;
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case llvm::Triple::arm:
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case llvm::Triple::thumb:
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switch (m_exc_code) {
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case 0x101:
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code_desc = "EXC_ARM_DA_ALIGN";
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break;
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case 0x102:
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code_desc = "EXC_ARM_DA_DEBUG";
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break;
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case 1:
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code_desc = "EXC_ARM_BREAKPOINT";
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break;
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// FIXME temporary workaround, exc_code 0 does not really mean
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// EXC_ARM_BREAKPOINT
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case 0:
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code_desc = "EXC_ARM_BREAKPOINT";
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break;
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}
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break;
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default:
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break;
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}
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} break;
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case 7:
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exc_desc = "EXC_SYSCALL";
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break;
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case 8:
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exc_desc = "EXC_MACH_SYSCALL";
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break;
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case 9:
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exc_desc = "EXC_RPC_ALERT";
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break;
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case 10:
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exc_desc = "EXC_CRASH";
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break;
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case 11:
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exc_desc = "EXC_RESOURCE";
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#if defined(__APPLE__)
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{
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int resource_type = EXC_RESOURCE_DECODE_RESOURCE_TYPE(m_exc_code);
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code_label = "limit";
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code_desc = code_desc_buf;
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subcode_label = "observed";
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subcode_desc = subcode_desc_buf;
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switch (resource_type) {
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case RESOURCE_TYPE_CPU:
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exc_desc = "EXC_RESOURCE RESOURCE_TYPE_CPU";
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snprintf(code_desc_buf, sizeof(code_desc_buf), "%d%%",
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(int)EXC_RESOURCE_CPUMONITOR_DECODE_PERCENTAGE(m_exc_code));
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snprintf(subcode_desc_buf, sizeof(subcode_desc_buf), "%d%%",
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(int)EXC_RESOURCE_CPUMONITOR_DECODE_PERCENTAGE_OBSERVED(m_exc_subcode));
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break;
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case RESOURCE_TYPE_WAKEUPS:
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exc_desc = "EXC_RESOURCE RESOURCE_TYPE_WAKEUPS";
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snprintf(code_desc_buf, sizeof(code_desc_buf), "%d w/s",
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(int)EXC_RESOURCE_CPUMONITOR_DECODE_WAKEUPS_PERMITTED(m_exc_code));
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snprintf(subcode_desc_buf, sizeof(subcode_desc_buf), "%d w/s",
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(int)EXC_RESOURCE_CPUMONITOR_DECODE_WAKEUPS_OBSERVED(m_exc_subcode));
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break;
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case RESOURCE_TYPE_MEMORY:
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exc_desc = "EXC_RESOURCE RESOURCE_TYPE_MEMORY";
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snprintf(code_desc_buf, sizeof(code_desc_buf), "%d MB",
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(int)EXC_RESOURCE_HWM_DECODE_LIMIT(m_exc_code));
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subcode_desc = nullptr;
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subcode_label = "unused";
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break;
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case RESOURCE_TYPE_IO:
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exc_desc = "EXC_RESOURCE RESOURCE_TYPE_IO";
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snprintf(code_desc_buf, sizeof(code_desc_buf), "%d MB",
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(int)EXC_RESOURCE_IO_DECODE_LIMIT(m_exc_code));
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snprintf(subcode_desc_buf, sizeof(subcode_desc_buf), "%d MB",
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(int)EXC_RESOURCE_IO_OBSERVED(m_exc_subcode));;
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break;
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}
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}
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#endif
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break;
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case 12:
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exc_desc = "EXC_GUARD";
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break;
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}
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StreamString strm;
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if (exc_desc)
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strm.PutCString(exc_desc);
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else
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strm.Printf("EXC_??? (%" PRIu64 ")", m_value);
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if (m_exc_data_count >= 1) {
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if (code_desc)
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strm.Printf(" (%s=%s", code_label, code_desc);
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else
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strm.Printf(" (%s=%" PRIu64, code_label, m_exc_code);
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}
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if (m_exc_data_count >= 2) {
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if (subcode_desc)
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strm.Printf(", %s=%s", subcode_label, subcode_desc);
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else
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strm.Printf(", %s=0x%" PRIx64, subcode_label, m_exc_subcode);
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}
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if (m_exc_data_count > 0)
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strm.PutChar(')');
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m_description = strm.GetString();
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}
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return m_description.c_str();
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}
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StopInfoSP StopInfoMachException::CreateStopReasonWithMachException(
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Thread &thread, uint32_t exc_type, uint32_t exc_data_count,
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uint64_t exc_code, uint64_t exc_sub_code, uint64_t exc_sub_sub_code,
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bool pc_already_adjusted, bool adjust_pc_if_needed) {
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if (exc_type != 0) {
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uint32_t pc_decrement = 0;
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ExecutionContext exe_ctx(thread.shared_from_this());
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Target *target = exe_ctx.GetTargetPtr();
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const llvm::Triple::ArchType cpu =
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target ? target->GetArchitecture().GetMachine()
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: llvm::Triple::UnknownArch;
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switch (exc_type) {
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case 1: // EXC_BAD_ACCESS
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break;
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case 2: // EXC_BAD_INSTRUCTION
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switch (cpu) {
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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switch (exc_code) {
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case 1: // EXC_PPC_INVALID_SYSCALL
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case 2: // EXC_PPC_UNIPL_INST
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case 3: // EXC_PPC_PRIVINST
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case 4: // EXC_PPC_PRIVREG
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break;
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case 5: // EXC_PPC_TRACE
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return StopInfo::CreateStopReasonToTrace(thread);
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case 6: // EXC_PPC_PERFMON
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break;
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}
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break;
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default:
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break;
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}
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break;
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case 3: // EXC_ARITHMETIC
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case 4: // EXC_EMULATION
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break;
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case 5: // EXC_SOFTWARE
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if (exc_code == 0x10003) // EXC_SOFT_SIGNAL
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{
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if (exc_sub_code == 5) {
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// On MacOSX, a SIGTRAP can signify that a process has called exec,
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// so we should check with our dynamic loader to verify.
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ProcessSP process_sp(thread.GetProcess());
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if (process_sp) {
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DynamicLoader *dynamic_loader = process_sp->GetDynamicLoader();
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if (dynamic_loader && dynamic_loader->ProcessDidExec()) {
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// The program was re-exec'ed
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return StopInfo::CreateStopReasonWithExec(thread);
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}
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// if (!process_did_exec)
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// {
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// // We have a SIGTRAP, make sure we
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// didn't exec by checking
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// // for the PC being at
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// "_dyld_start"...
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// lldb::StackFrameSP frame_sp
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// (thread.GetStackFrameAtIndex(0));
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// if (frame_sp)
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// {
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// const Symbol *symbol =
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// frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol;
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// if (symbol)
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// {
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// if (symbol->GetName() ==
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// ConstString("_dyld_start"))
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// process_did_exec = true;
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// }
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// }
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// }
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}
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}
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return StopInfo::CreateStopReasonWithSignal(thread, exc_sub_code);
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}
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break;
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case 6: // EXC_BREAKPOINT
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{
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bool is_actual_breakpoint = false;
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bool is_trace_if_actual_breakpoint_missing = false;
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switch (cpu) {
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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if (exc_code == 1) // EXC_I386_SGL
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{
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if (!exc_sub_code) {
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// This looks like a plain trap.
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// Have to check if there is a breakpoint here as well. When you
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// single-step onto a trap, the single step stops you not to trap.
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// Since we also do that check below, let's just use that logic.
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is_actual_breakpoint = true;
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is_trace_if_actual_breakpoint_missing = true;
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} else {
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// It's a watchpoint, then.
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// The exc_sub_code indicates the data break address.
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lldb::WatchpointSP wp_sp;
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if (target)
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wp_sp = target->GetWatchpointList().FindByAddress(
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(lldb::addr_t)exc_sub_code);
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if (wp_sp && wp_sp->IsEnabled()) {
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// Debugserver may piggyback the hardware index of the fired
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// watchpoint in the exception data. Set the hardware index if
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// that's the case.
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if (exc_data_count >= 3)
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wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
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return StopInfo::CreateStopReasonWithWatchpointID(thread,
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wp_sp->GetID());
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}
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}
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} else if (exc_code == 2 || // EXC_I386_BPT
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exc_code == 3) // EXC_I386_BPTFLT
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{
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// KDP returns EXC_I386_BPTFLT for trace breakpoints
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if (exc_code == 3)
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is_trace_if_actual_breakpoint_missing = true;
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is_actual_breakpoint = true;
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if (!pc_already_adjusted)
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pc_decrement = 1;
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}
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break;
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case llvm::Triple::ppc:
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case llvm::Triple::ppc64:
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is_actual_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT
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break;
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case llvm::Triple::arm:
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case llvm::Triple::thumb:
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if (exc_code == 0x102) // EXC_ARM_DA_DEBUG
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{
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// It's a watchpoint, then, if the exc_sub_code indicates a
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// known/enabled data break address from our watchpoint list.
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lldb::WatchpointSP wp_sp;
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if (target)
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wp_sp = target->GetWatchpointList().FindByAddress(
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(lldb::addr_t)exc_sub_code);
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if (wp_sp && wp_sp->IsEnabled()) {
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// Debugserver may piggyback the hardware index of the fired
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// watchpoint in the exception data. Set the hardware index if
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// that's the case.
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if (exc_data_count >= 3)
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wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
|
|
return StopInfo::CreateStopReasonWithWatchpointID(thread,
|
|
wp_sp->GetID());
|
|
} else {
|
|
is_actual_breakpoint = true;
|
|
is_trace_if_actual_breakpoint_missing = true;
|
|
}
|
|
} else if (exc_code == 1) // EXC_ARM_BREAKPOINT
|
|
{
|
|
is_actual_breakpoint = true;
|
|
is_trace_if_actual_breakpoint_missing = true;
|
|
} else if (exc_code == 0) // FIXME not EXC_ARM_BREAKPOINT but a kernel
|
|
// is currently returning this so accept it
|
|
// as indicating a breakpoint until the
|
|
// kernel is fixed
|
|
{
|
|
is_actual_breakpoint = true;
|
|
is_trace_if_actual_breakpoint_missing = true;
|
|
}
|
|
break;
|
|
|
|
case llvm::Triple::aarch64: {
|
|
if (exc_code == 1 && exc_sub_code == 0) // EXC_ARM_BREAKPOINT
|
|
{
|
|
// This is hit when we single instruction step aka MDSCR_EL1 SS bit 0
|
|
// is set
|
|
is_actual_breakpoint = false;
|
|
is_trace_if_actual_breakpoint_missing = true;
|
|
}
|
|
if (exc_code == 0x102) // EXC_ARM_DA_DEBUG
|
|
{
|
|
// It's a watchpoint, then, if the exc_sub_code indicates a
|
|
// known/enabled data break address from our watchpoint list.
|
|
lldb::WatchpointSP wp_sp;
|
|
if (target)
|
|
wp_sp = target->GetWatchpointList().FindByAddress(
|
|
(lldb::addr_t)exc_sub_code);
|
|
if (wp_sp && wp_sp->IsEnabled()) {
|
|
// Debugserver may piggyback the hardware index of the fired
|
|
// watchpoint in the exception data. Set the hardware index if
|
|
// that's the case.
|
|
if (exc_data_count >= 3)
|
|
wp_sp->SetHardwareIndex((uint32_t)exc_sub_sub_code);
|
|
return StopInfo::CreateStopReasonWithWatchpointID(thread,
|
|
wp_sp->GetID());
|
|
}
|
|
// EXC_ARM_DA_DEBUG seems to be reused for EXC_BREAKPOINT as well as
|
|
// EXC_BAD_ACCESS
|
|
if (thread.GetTemporaryResumeState() == eStateStepping)
|
|
return StopInfo::CreateStopReasonToTrace(thread);
|
|
}
|
|
// It looks like exc_sub_code has the 4 bytes of the instruction that
|
|
// triggered the exception, i.e. our breakpoint opcode
|
|
is_actual_breakpoint = exc_code == 1;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (is_actual_breakpoint) {
|
|
RegisterContextSP reg_ctx_sp(thread.GetRegisterContext());
|
|
addr_t pc = reg_ctx_sp->GetPC() - pc_decrement;
|
|
|
|
ProcessSP process_sp(thread.CalculateProcess());
|
|
|
|
lldb::BreakpointSiteSP bp_site_sp;
|
|
if (process_sp)
|
|
bp_site_sp = process_sp->GetBreakpointSiteList().FindByAddress(pc);
|
|
if (bp_site_sp && bp_site_sp->IsEnabled()) {
|
|
// Update the PC if we were asked to do so, but only do so if we find
|
|
// a breakpoint that we know about cause this could be a trap
|
|
// instruction in the code
|
|
if (pc_decrement > 0 && adjust_pc_if_needed)
|
|
reg_ctx_sp->SetPC(pc);
|
|
|
|
// If the breakpoint is for this thread, then we'll report the hit,
|
|
// but if it is for another thread, we can just report no reason. We
|
|
// don't need to worry about stepping over the breakpoint here, that
|
|
// will be taken care of when the thread resumes and notices that
|
|
// there's a breakpoint under the pc. If we have an operating system
|
|
// plug-in, we might have set a thread specific breakpoint using the
|
|
// operating system thread ID, so we can't make any assumptions about
|
|
// the thread ID so we must always report the breakpoint regardless
|
|
// of the thread.
|
|
if (bp_site_sp->ValidForThisThread(&thread) ||
|
|
thread.GetProcess()->GetOperatingSystem() != NULL)
|
|
return StopInfo::CreateStopReasonWithBreakpointSiteID(
|
|
thread, bp_site_sp->GetID());
|
|
else if (is_trace_if_actual_breakpoint_missing)
|
|
return StopInfo::CreateStopReasonToTrace(thread);
|
|
else
|
|
return StopInfoSP();
|
|
}
|
|
|
|
// Don't call this a trace if we weren't single stepping this thread.
|
|
if (is_trace_if_actual_breakpoint_missing &&
|
|
thread.GetTemporaryResumeState() == eStateStepping) {
|
|
return StopInfo::CreateStopReasonToTrace(thread);
|
|
}
|
|
}
|
|
} break;
|
|
|
|
case 7: // EXC_SYSCALL
|
|
case 8: // EXC_MACH_SYSCALL
|
|
case 9: // EXC_RPC_ALERT
|
|
case 10: // EXC_CRASH
|
|
break;
|
|
}
|
|
|
|
return StopInfoSP(new StopInfoMachException(
|
|
thread, exc_type, exc_data_count, exc_code, exc_sub_code));
|
|
}
|
|
return StopInfoSP();
|
|
}
|