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Error checking correction in AArch64 hardware watchpoint code 

Differential Revision: http://reviews.llvm.org/D12328

llvm-svn: 246045
This commit is contained in:
Omair Javaid 2015-08-26 18:23:27 +00:00
parent b5d8b27fc8
commit 3a56363aec
1 changed files with 69 additions and 14 deletions
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83
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
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@ -391,10 +391,15 @@ NativeRegisterContextLinux_arm64::SetHardwareBreakpoint (lldb::addr_t addr, size
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
Error error;
uint32_t control_value, bp_index;
// Read hardware breakpoint and watchpoint information.
error = ReadHardwareDebugInfo ();
if (error.Fail())
return LLDB_INVALID_INDEX32;
uint32_t control_value = 0, bp_index = 0;
// Check if size has a valid hardware breakpoint length.
if (size != 4)
@ -436,7 +441,10 @@ NativeRegisterContextLinux_arm64::SetHardwareBreakpoint (lldb::addr_t addr, size
m_hbr_regs[bp_index].refcount = 1;
// PTRACE call to set corresponding hardware breakpoint register.
WriteHardwareDebugRegs(eDREGTypeBREAK);
error = WriteHardwareDebugRegs(eDREGTypeBREAK);
if (error.Fail())
return LLDB_INVALID_INDEX32;
}
else
m_hbr_regs[bp_index].refcount++;
@ -452,8 +460,13 @@ NativeRegisterContextLinux_arm64::ClearHardwareBreakpoint (uint32_t hw_idx)
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
Error error;
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
error = ReadHardwareDebugInfo ();
if (error.Fail())
return false;
if (hw_idx >= m_max_hbp_supported)
return false;
@ -472,6 +485,11 @@ NativeRegisterContextLinux_arm64::ClearHardwareBreakpoint (uint32_t hw_idx)
// PTRACE call to clear corresponding hardware breakpoint register.
WriteHardwareDebugRegs(eDREGTypeBREAK);
if (error.Fail())
return false;
return true;
}
return false;
@ -485,8 +503,13 @@ NativeRegisterContextLinux_arm64::NumSupportedHardwareWatchpoints ()
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
Error error;
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
error = ReadHardwareDebugInfo ();
if (error.Fail())
return LLDB_INVALID_INDEX32;
return m_max_hwp_supported;
}
@ -499,10 +522,15 @@ NativeRegisterContextLinux_arm64::SetHardwareWatchpoint (lldb::addr_t addr, size
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
Error error;
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
error = ReadHardwareDebugInfo ();
if (error.Fail())
return LLDB_INVALID_INDEX32;
uint32_t control_value, wp_index;
uint32_t control_value = 0, wp_index = 0;
// Check if we are setting watchpoint other than read/write/access
// Also update watchpoint flag to match AArch64 write-read bit configuration.
@ -562,7 +590,10 @@ NativeRegisterContextLinux_arm64::SetHardwareWatchpoint (lldb::addr_t addr, size
m_hwp_regs[wp_index].refcount = 1;
// PTRACE call to set corresponding watchpoint register.
WriteHardwareDebugRegs(eDREGTypeWATCH);
error = WriteHardwareDebugRegs(eDREGTypeWATCH);
if (error.Fail())
return LLDB_INVALID_INDEX32;
}
else
m_hwp_regs[wp_index].refcount++;
@ -578,8 +609,13 @@ NativeRegisterContextLinux_arm64::ClearHardwareWatchpoint (uint32_t wp_index)
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
Error error;
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
error = ReadHardwareDebugInfo ();
if (error.Fail())
return false;
if (wp_index >= m_max_hwp_supported)
return false;
@ -598,7 +634,11 @@ NativeRegisterContextLinux_arm64::ClearHardwareWatchpoint (uint32_t wp_index)
m_hwp_regs[wp_index].refcount = 0;
// Ptrace call to update hardware debug registers
WriteHardwareDebugRegs(eDREGTypeWATCH);
error = WriteHardwareDebugRegs(eDREGTypeWATCH);
if (error.Fail())
return false;
return true;
}
@ -613,8 +653,13 @@ NativeRegisterContextLinux_arm64::ClearAllHardwareWatchpoints ()
if (log)
log->Printf ("NativeRegisterContextLinux_arm64::%s()", __FUNCTION__);
Error error;
// Read hardware breakpoint and watchpoint information.
ReadHardwareDebugInfo ();
error = ReadHardwareDebugInfo ();
if (error.Fail())
return error;
for (uint32_t i = 0; i < m_max_hwp_supported; i++)
{
@ -626,7 +671,10 @@ NativeRegisterContextLinux_arm64::ClearAllHardwareWatchpoints ()
m_hwp_regs[i].refcount = 0;
// Ptrace call to update hardware debug registers
WriteHardwareDebugRegs(eDREGTypeWATCH);
error = WriteHardwareDebugRegs(eDREGTypeWATCH);
if (error.Fail())
return error;
}
}
@ -730,12 +778,19 @@ NativeRegisterContextLinux_arm64::ReadHardwareDebugInfo()
ioVec.iov_base = &dreg_state;
ioVec.iov_len = sizeof (dreg_state);
error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, tid, &regset, &ioVec, ioVec.iov_len);
if (error.Fail())
return error;
m_max_hwp_supported = dreg_state.dbg_info & 0xff;
regset = NT_ARM_HW_BREAK;
error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, tid, &regset, &ioVec, ioVec.iov_len);
m_max_hbp_supported = dreg_state.dbg_info & 0xff;
if (error.Fail())
return error;
m_max_hbp_supported = dreg_state.dbg_info & 0xff;
m_refresh_hwdebug_info = false;
return error;