From 8b800369ea31a96fd83bb94cfc1825978b3f7fdd Mon Sep 17 00:00:00 2001 From: Dimitri ALBORA Date: Sat, 26 Jan 2019 22:08:39 +0100 Subject: [PATCH] gdbstub: only let Execute breakpoints write/restore BKPT opcodes into target memory --- src/core/gdbstub/gdbstub.cpp | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/src/core/gdbstub/gdbstub.cpp b/src/core/gdbstub/gdbstub.cpp index a1cad4fcb..dafb32aae 100644 --- a/src/core/gdbstub/gdbstub.cpp +++ b/src/core/gdbstub/gdbstub.cpp @@ -507,8 +507,11 @@ static void RemoveBreakpoint(BreakpointType type, VAddr addr) { LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: {:016X} bytes at {:016X} of type {}", bp->second.len, bp->second.addr, static_cast(type)); - Memory::WriteBlock(bp->second.addr, bp->second.inst.data(), bp->second.inst.size()); - Core::System::GetInstance().InvalidateCpuInstructionCaches(); + + if (type == BreakpointType::Execute) { + Memory::WriteBlock(bp->second.addr, bp->second.inst.data(), bp->second.inst.size()); + Core::System::GetInstance().InvalidateCpuInstructionCaches(); + } p.erase(addr); } @@ -1057,9 +1060,12 @@ static bool CommitBreakpoint(BreakpointType type, VAddr addr, u64 len) { breakpoint.addr = addr; breakpoint.len = len; Memory::ReadBlock(addr, breakpoint.inst.data(), breakpoint.inst.size()); + static constexpr std::array btrap{0x00, 0x7d, 0x20, 0xd4}; - Memory::WriteBlock(addr, btrap.data(), btrap.size()); - Core::System::GetInstance().InvalidateCpuInstructionCaches(); + if (type == BreakpointType::Execute) { + Memory::WriteBlock(addr, btrap.data(), btrap.size()); + Core::System::GetInstance().InvalidateCpuInstructionCaches(); + } p.insert({addr, breakpoint}); LOG_DEBUG(Debug_GDBStub, "gdb: added {} breakpoint: {:016X} bytes at {:016X}",