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Revert "Use BKPT instead of UDF for arm/thumb breakpoints" 

This reverts commit 293c18e067d663e0fe93e6f3d800c2a4bfada2b0.

The BKPT instruction generates SIGBUS instead of SIGTRAP in the Linux
kernel on Nexus 6 - 5.1.1 (kernel version 3.10.40). Revert the CL
until we can figure out how can we hanble the SIGBUS or how to get
back a SIGTRAP using the BKPT instruction.

llvm-svn: 260969
This commit is contained in:
Tamas Berghammer 2016-02-16 15:14:36 +00:00
parent aa7429112e
commit be379e1590
2 changed files with 10 additions and 8 deletions
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6
lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp
View File

@ -560,8 +560,10 @@ PlatformLinux::GetSoftwareBreakpointTrapOpcode (Target &target,
break;
case llvm::Triple::arm:
{
static const uint8_t g_arm_breakpoint_opcode[] = { 0x70, 0xbe, 0x20, 0xe1 };
static const uint8_t g_thumb_breakpoint_opcode[] = { 0x70, 0xbe };
// The ARM reference recommends the use of 0xe7fddefe and 0xdefe
// but the linux kernel does otherwise.
static const uint8_t g_arm_breakpoint_opcode[] = { 0xf0, 0x01, 0xf0, 0xe7 };
static const uint8_t g_thumb_breakpoint_opcode[] = { 0x01, 0xde };
lldb::BreakpointLocationSP bp_loc_sp (bp_site->GetOwnerAtIndex (0));
AddressClass addr_class = eAddressClassUnknown;

12
lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
View File

@ -1294,10 +1294,8 @@ NativeProcessLinux::MonitorSIGTRAP(const siginfo_t &info, NativeThreadLinux &thr
break;
}
if (m_arch.GetMachine() == llvm::Triple::arm)
MonitorBreakpoint(thread); // Arm linux reports trace for breakpoint hits
else
MonitorTrace(thread); // Report the trace
// Otherwise, report step over
MonitorTrace(thread);
break;
}
@ -2291,11 +2289,13 @@ NativeProcessLinux::GetSoftwareBreakpointTrapOpcode (size_t trap_opcode_size_hin
// FIXME put this behind a breakpoint protocol class that can be set per
// architecture. Need MIPS support here.
static const uint8_t g_aarch64_opcode[] = { 0x00, 0x00, 0x20, 0xd4 };
static const uint8_t g_arm_breakpoint_opcode[] = { 0x70, 0xbe, 0x20, 0xe1 };
// The ARM reference recommends the use of 0xe7fddefe and 0xdefe but the
// linux kernel does otherwise.
static const uint8_t g_arm_breakpoint_opcode[] = { 0xf0, 0x01, 0xf0, 0xe7 };
static const uint8_t g_i386_opcode [] = { 0xCC };
static const uint8_t g_mips64_opcode[] = { 0x00, 0x00, 0x00, 0x0d };
static const uint8_t g_mips64el_opcode[] = { 0x0d, 0x00, 0x00, 0x00 };
static const uint8_t g_thumb_breakpoint_opcode[] = { 0x70, 0xbe };
static const uint8_t g_thumb_breakpoint_opcode[] = { 0x01, 0xde };
switch (m_arch.GetMachine ())
{