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[LLDB][MIPS] Support standard GDB remote stop reply packet for watchpoint 

SUMMARY:
    The patch supports TAAwatch:addr packet. The patch also sets m_watchpoints_trigger_after_instruction 
    to eLazyBoolNo when qHostInfo or qWatchpointSupportInfo is not supported by the target.
    
    Reviewers: jingham, clayborg
    Subscribers: nitesh.jain, mohit.bhakkad, sagar, bhushan and lldb-commits
    Differential Revision: http://reviews.llvm.org/D11747

llvm-svn: 244865
This commit is contained in:
Jaydeep Patil 2015-08-13 03:46:01 +00:00
parent 831435042e
commit 725666cc65
3 changed files with 41 additions and 7 deletions
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27
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
View File

@ -2473,26 +2473,45 @@ GDBRemoteCommunicationClient::GetWatchpointSupportInfo (uint32_t &num)
}
lldb_private::Error
GDBRemoteCommunicationClient::GetWatchpointSupportInfo (uint32_t &num, bool& after)
GDBRemoteCommunicationClient::GetWatchpointSupportInfo (uint32_t &num, bool& after, const ArchSpec &arch)
{
Error error(GetWatchpointSupportInfo(num));
if (error.Success())
error = GetWatchpointsTriggerAfterInstruction(after);
error = GetWatchpointsTriggerAfterInstruction(after, arch);
return error;
}
lldb_private::Error
GDBRemoteCommunicationClient::GetWatchpointsTriggerAfterInstruction (bool &after)
GDBRemoteCommunicationClient::GetWatchpointsTriggerAfterInstruction (bool &after, const ArchSpec &arch)
{
Error error;
llvm::Triple::ArchType atype = arch.GetMachine();
// we assume watchpoints will happen after running the relevant opcode
// and we only want to override this behavior if we have explicitly
// received a qHostInfo telling us otherwise
if (m_qHostInfo_is_valid != eLazyBoolYes)
after = true;
{
// On targets like MIPS, watchpoint exceptions are always generated
// before the instruction is executed. The connected target may not
// support qHostInfo or qWatchpointSupportInfo packets.
if (atype == llvm::Triple::mips || atype == llvm::Triple::mipsel
|| atype == llvm::Triple::mips64 || atype == llvm::Triple::mips64el)
after = false;
else
after = true;
}
else
{
// For MIPS, set m_watchpoints_trigger_after_instruction to eLazyBoolNo
// if it is not calculated before.
if (m_watchpoints_trigger_after_instruction == eLazyBoolCalculate &&
(atype == llvm::Triple::mips || atype == llvm::Triple::mipsel
|| atype == llvm::Triple::mips64 || atype == llvm::Triple::mips64el))
m_watchpoints_trigger_after_instruction = eLazyBoolNo;
after = (m_watchpoints_trigger_after_instruction != eLazyBoolNo);
}
return error;
}

4
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
View File

@ -287,10 +287,10 @@ public:
GetWatchpointSupportInfo (uint32_t &num);
Error
GetWatchpointSupportInfo (uint32_t &num, bool& after);
GetWatchpointSupportInfo (uint32_t &num, bool& after, const ArchSpec &arch);
Error
GetWatchpointsTriggerAfterInstruction (bool &after);
GetWatchpointsTriggerAfterInstruction (bool &after, const ArchSpec &arch);
const ArchSpec &
GetHostArchitecture ();

17
lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
View File

@ -2484,6 +2484,21 @@ ProcessGDBRemote::SetThreadStopInfo (StringExtractor& stop_packet)
}
}
}
else if (key.compare("watch") == 0 || key.compare("rwatch") == 0 || key.compare("awatch") == 0)
{
// Support standard GDB remote stop reply packet 'TAAwatch:addr'
lldb::addr_t wp_addr = StringConvert::ToUInt64 (value.c_str(), LLDB_INVALID_ADDRESS, 16);
WatchpointSP wp_sp = GetTarget().GetWatchpointList().FindByAddress(wp_addr);
uint32_t wp_index = LLDB_INVALID_INDEX32;
if (wp_sp)
wp_index = wp_sp->GetHardwareIndex();
reason = "watchpoint";
StreamString ostr;
ostr.Printf("%" PRIu64 " %" PRIu32, wp_addr, wp_index);
description = ostr.GetString().c_str();
}
else if (key.size() == 2 && ::isxdigit(key[0]) && ::isxdigit(key[1]))
{
uint32_t reg = StringConvert::ToUInt32 (key.c_str(), UINT32_MAX, 16);
@ -3085,7 +3100,7 @@ ProcessGDBRemote::GetWatchpointSupportInfo (uint32_t &num)
Error
ProcessGDBRemote::GetWatchpointSupportInfo (uint32_t &num, bool& after)
{
Error error (m_gdb_comm.GetWatchpointSupportInfo (num, after));
Error error (m_gdb_comm.GetWatchpointSupportInfo (num, after, GetTarget().GetArchitecture()));
return error;
}