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clang-p2996/lldb/source/Plugins/Process/Utility/StopInfoMachException.cpp
Greg Clayton 8d400e1750 Fixed an issue in the EmulateInstructionARM there the IT opcode was trying to 
parse NOP instructions. I added the new table entries for the NOP for the
plain NOP, Yield, WFE, WFI, and SEV variants. Modified the opcode emulation
function EmulateInstructionARM::EmulateMOVRdSP(...) to notify us when it is
creating a frame. Also added an abtract way to detect the frame pointer 
register for both the standard ARM ABI and for Darwin.

Fixed GDBRemoteRegisterContext::WriteAllRegisterValues(...) to correctly be
able to individually write register values back if case the 'G' packet is
not implemented or returns an error.

Modified the StopInfoMachException to "trace" stop reasons. On ARM we currently
use the BVR/BCR register pairs to say "stop when the PC is not equal to the 
current PC value", and this results in a EXC_BREAKPOINT mach exception that
has 0x102 in the code.

Modified debugserver to create the short option string from long option
definitions to make sure it doesn't get out of date. The short option string
was missing many of the newer short option values due to a modification of
the long options defs, and not modifying the short option string.

llvm-svn: 131911
2011-05-23 18:04:09 +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/Core/ArchSpec.h"
#include "lldb/Core/StreamString.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)
{
const llvm::Triple::ArchType cpu = m_thread.GetProcess().GetTarget().GetArchitecture().GetMachine();
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::arm:
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:
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:
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;
}
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;
}
StreamString strm;
if (exc_desc)
strm.PutCString(exc_desc);
else
strm.Printf("EXC_??? (%llu)", m_value);
if (m_exc_data_count >= 1)
{
if (code_desc)
strm.Printf(" (%s=%s", code_label, code_desc);
else
strm.Printf(" (%s=%llu", 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%llx", 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
)
{
if (exc_type != 0)
{
const llvm::Triple::ArchType cpu = thread.GetProcess().GetTarget().GetArchitecture().GetMachine();
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
return StopInfo::CreateStopReasonWithSignal (thread, exc_sub_code);
break;
case 6: // EXC_BREAKPOINT
{
bool is_software_breakpoint = false;
switch (cpu)
{
case llvm::Triple::x86:
case llvm::Triple::x86_64:
if (exc_code == 1) // EXC_I386_SGL
{
return StopInfo::CreateStopReasonToTrace(thread);
}
else if (exc_code == 2) // EXC_I386_BPT
{
is_software_breakpoint = true;
}
break;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
is_software_breakpoint = exc_code == 1; // EXC_PPC_BREAKPOINT
break;
case llvm::Triple::arm:
if (exc_code == 0x102)
{
// EXC_ARM_DA_DEBUG seems to be reused for EXC_BREAKPOINT as well as EXC_BAD_ACCESS
return StopInfo::CreateStopReasonToTrace(thread);
}
else
is_software_breakpoint = exc_code == 1; // EXC_ARM_BREAKPOINT
break;
default:
break;
}
if (is_software_breakpoint)
{
addr_t pc = thread.GetRegisterContext()->GetPC();
lldb::BreakpointSiteSP bp_site_sp = thread.GetProcess().GetBreakpointSiteList().FindByAddress(pc);
if (bp_site_sp)
{
// 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 (bp_site_sp->ValidForThisThread (&thread))
return StopInfo::CreateStopReasonWithBreakpointSiteID (thread, bp_site_sp->GetID());
else
return StopInfoSP();
}
else if (cpu == llvm::Triple::arm)
{
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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