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llvm-project/lldb/source/Plugins/Process/Utility/StopInfoMachException.cpp
Kate Stone b9c1b51e45 *** This commit represents a complete reformatting of the LLDB source code 
*** to conform to clang-format’s LLVM style.  This kind of mass change has
*** two obvious implications:

Firstly, merging this particular commit into a downstream fork may be a huge
effort.  Alternatively, it may be worth merging all changes up to this commit,
performing the same reformatting operation locally, and then discarding the
merge for this particular commit.  The commands used to accomplish this
reformatting were as follows (with current working directory as the root of
the repository):

    find . \( -iname "*.c" -or -iname "*.cpp" -or -iname "*.h" -or -iname "*.mm" \) -exec clang-format -i {} +
    find . -iname "*.py" -exec autopep8 --in-place --aggressive --aggressive {} + ;

The version of clang-format used was 3.9.0, and autopep8 was 1.2.4.

Secondly, “blame” style tools will generally point to this commit instead of
a meaningful prior commit.  There are alternatives available that will attempt
to look through this change and find the appropriate prior commit.  YMMV.

llvm-svn: 280751
2016-09-06 20:57:50 +00:00

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//===-- StopInfoMachException.cpp -------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "StopInfoMachException.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/UnixSignals.h"
using namespace lldb;
using namespace lldb_private;
const char *StopInfoMachException::GetDescription() {
if (m_description.empty() && m_value != 0) {
ExecutionContext exe_ctx(m_thread_wp.lock());
Target *target = exe_ctx.GetTargetPtr();
const llvm::Triple::ArchType cpu =
target ? target->GetArchitecture().GetMachine()
: llvm::Triple::UnknownArch;
const char *exc_desc = NULL;
const char *code_label = "code";
const char *code_desc = NULL;
const char *subcode_label = "subcode";
const char *subcode_desc = NULL;
switch (m_value) {
case 1: // EXC_BAD_ACCESS
exc_desc = "EXC_BAD_ACCESS";
subcode_label = "address";
switch (cpu) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
switch (m_exc_code) {
case 0xd:
code_desc = "EXC_I386_GPFLT";
m_exc_data_count = 1;
break;
}
break;
case llvm::Triple::arm:
case llvm::Triple::thumb:
switch (m_exc_code) {
case 0x101:
code_desc = "EXC_ARM_DA_ALIGN";
break;
case 0x102:
code_desc = "EXC_ARM_DA_DEBUG";
break;
}
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
switch (m_exc_code) {
case 0x101:
code_desc = "EXC_PPC_VM_PROT_READ";
break;
case 0x102:
code_desc = "EXC_PPC_BADSPACE";
break;
case 0x103:
code_desc = "EXC_PPC_UNALIGNED";
break;
}
break;
default:
break;
}
break;
case 2: // EXC_BAD_INSTRUCTION
exc_desc = "EXC_BAD_INSTRUCTION";
switch (cpu) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
if (m_exc_code == 1)
code_desc = "EXC_I386_INVOP";
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
switch (m_exc_code) {
case 1:
code_desc = "EXC_PPC_INVALID_SYSCALL";
break;
case 2:
code_desc = "EXC_PPC_UNIPL_INST";
break;
case 3:
code_desc = "EXC_PPC_PRIVINST";
break;
case 4:
code_desc = "EXC_PPC_PRIVREG";
break;
case 5:
code_desc = "EXC_PPC_TRACE";
break;
case 6:
code_desc = "EXC_PPC_PERFMON";
break;
}
break;
case llvm::Triple::arm:
case llvm::Triple::thumb:
if (m_exc_code == 1)
code_desc = "EXC_ARM_UNDEFINED";
break;
default:
break;
}
break;
case 3: // EXC_ARITHMETIC
exc_desc = "EXC_ARITHMETIC";
switch (cpu) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
switch (m_exc_code) {
case 1:
code_desc = "EXC_I386_DIV";
break;
case 2:
code_desc = "EXC_I386_INTO";
break;
case 3:
code_desc = "EXC_I386_NOEXT";
break;
case 4:
code_desc = "EXC_I386_EXTOVR";
break;
case 5:
code_desc = "EXC_I386_EXTERR";
break;
case 6:
code_desc = "EXC_I386_EMERR";
break;
case 7:
code_desc = "EXC_I386_BOUND";
break;
case 8:
code_desc = "EXC_I386_SSEEXTERR";
break;
}
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
switch (m_exc_code) {
case 1:
code_desc = "EXC_PPC_OVERFLOW";
break;
case 2:
code_desc = "EXC_PPC_ZERO_DIVIDE";
break;
case 3:
code_desc = "EXC_PPC_FLT_INEXACT";
break;
case 4:
code_desc = "EXC_PPC_FLT_ZERO_DIVIDE";
break;
case 5:
code_desc = "EXC_PPC_FLT_UNDERFLOW";
break;
case 6:
code_desc = "EXC_PPC_FLT_OVERFLOW";
break;
case 7:
code_desc = "EXC_PPC_FLT_NOT_A_NUMBER";
break;
}
break;
default:
break;
}
break;
case 4: // EXC_EMULATION
exc_desc = "EXC_EMULATION";
break;
case 5: // EXC_SOFTWARE
exc_desc = "EXC_SOFTWARE";
if (m_exc_code == 0x10003) {
subcode_desc = "EXC_SOFT_SIGNAL";
subcode_label = "signo";
}
break;
case 6: // EXC_BREAKPOINT
{
exc_desc = "EXC_BREAKPOINT";
switch (cpu) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
switch (m_exc_code) {
case 1:
code_desc = "EXC_I386_SGL";
break;
case 2:
code_desc = "EXC_I386_BPT";
break;
}
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
switch (m_exc_code) {
case 1:
code_desc = "EXC_PPC_BREAKPOINT";
break;
}
break;
case llvm::Triple::arm:
case llvm::Triple::thumb:
switch (m_exc_code) {
case 0x101:
code_desc = "EXC_ARM_DA_ALIGN";
break;
case 0x102:
code_desc = "EXC_ARM_DA_DEBUG";
break;
case 1:
code_desc = "EXC_ARM_BREAKPOINT";
break;
// FIXME temporary workaround, exc_code 0 does not really mean
// EXC_ARM_BREAKPOINT
case 0:
code_desc = "EXC_ARM_BREAKPOINT";
break;
}
break;
default:
break;
}
} break;
case 7:
exc_desc = "EXC_SYSCALL";
break;
case 8:
exc_desc = "EXC_MACH_SYSCALL";
break;
case 9:
exc_desc = "EXC_RPC_ALERT";
break;
case 10:
exc_desc = "EXC_CRASH";
break;
case 11:
exc_desc = "EXC_RESOURCE";
break;
case 12:
exc_desc = "EXC_GUARD";
break;
}
StreamString strm;
if (exc_desc)
strm.PutCString(exc_desc);
else
strm.Printf("EXC_??? (%" PRIu64 ")", m_value);
if (m_exc_data_count >= 1) {
if (code_desc)
strm.Printf(" (%s=%s", code_label, code_desc);
else
strm.Printf(" (%s=%" PRIu64, code_label, m_exc_code);
}
if (m_exc_data_count >= 2) {
if (subcode_desc)
strm.Printf(", %s=%s", subcode_label, subcode_desc);
else
strm.Printf(", %s=0x%" PRIx64, subcode_label, m_exc_subcode);
}
if (m_exc_data_count > 0)
strm.PutChar(')');
m_description.swap(strm.GetString());
}
return m_description.c_str();
}
StopInfoSP StopInfoMachException::CreateStopReasonWithMachException(
Thread &thread, uint32_t exc_type, uint32_t exc_data_count,
uint64_t exc_code, uint64_t exc_sub_code, uint64_t exc_sub_sub_code,
bool pc_already_adjusted, bool adjust_pc_if_needed) {
if (exc_type != 0) {
uint32_t pc_decrement = 0;
ExecutionContext exe_ctx(thread.shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
const llvm::Triple::ArchType cpu =
target ? target->GetArchitecture().GetMachine()
: llvm::Triple::UnknownArch;
switch (exc_type) {
case 1: // EXC_BAD_ACCESS
break;
case 2: // EXC_BAD_INSTRUCTION
switch (cpu) {
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
switch (exc_code) {
case 1: // EXC_PPC_INVALID_SYSCALL
case 2: // EXC_PPC_UNIPL_INST
case 3: // EXC_PPC_PRIVINST
case 4: // EXC_PPC_PRIVREG
break;
case 5: // EXC_PPC_TRACE
return StopInfo::CreateStopReasonToTrace(thread);
case 6: // EXC_PPC_PERFMON
break;
}
break;
default:
break;
}
break;
case 3: // EXC_ARITHMETIC
case 4: // EXC_EMULATION
break;
case 5: // EXC_SOFTWARE
if (exc_code == 0x10003) // EXC_SOFT_SIGNAL
{
if (exc_sub_code == 5) {
// On MacOSX, a SIGTRAP can signify that a process has called
// exec, so we should check with our dynamic loader to verify.
ProcessSP process_sp(thread.GetProcess());
if (process_sp) {
DynamicLoader *dynamic_loader = process_sp->GetDynamicLoader();
if (dynamic_loader && dynamic_loader->ProcessDidExec()) {
// The program was re-exec'ed
return StopInfo::CreateStopReasonWithExec(thread);
}
// if (!process_did_exec)
// {
// // We have a SIGTRAP, make sure we
// didn't exec by checking
// // for the PC being at
// "_dyld_start"...
// lldb::StackFrameSP frame_sp
// (thread.GetStackFrameAtIndex(0));
// if (frame_sp)
// {
// const Symbol *symbol =
// frame_sp->GetSymbolContext(eSymbolContextSymbol).symbol;
// if (symbol)
// {
// if (symbol->GetName() ==
// ConstString("_dyld_start"))
// process_did_exec = true;
// }
// }
// }
}
}
return StopInfo::CreateStopReasonWithSignal(thread, exc_sub_code);
}
break;
case 6: // EXC_BREAKPOINT
{
bool is_actual_breakpoint = false;
bool is_trace_if_actual_breakpoint_missing = false;
switch (cpu) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
if (exc_code == 1) // EXC_I386_SGL
{
if (!exc_sub_code) {
// This looks like a plain trap.
// Have to check if there is a breakpoint here as well. When you
// single-step onto a trap,
// the single step stops you not to trap. Since we also do that
// check below, let's just use
// that logic.
is_actual_breakpoint = true;
is_trace_if_actual_breakpoint_missing = true;
} else {
// It's a watchpoint, then.
// The exc_sub_code indicates the data break address.
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());
}
}
} else if (exc_code == 2 || // EXC_I386_BPT
exc_code == 3) // EXC_I386_BPTFLT
{
// KDP returns EXC_I386_BPTFLT for trace breakpoints
if (exc_code == 3)
is_trace_if_actual_breakpoint_missing = true;
is_actual_breakpoint = true;
if (!pc_already_adjusted)
pc_decrement = 1;
}
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
is_actual_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT
break;
case llvm::Triple::arm:
case llvm::Triple::thumb:
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());
} 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();
}
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