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SourceLevelDebugPkg/DebugAgent: Clear/Restore EFLAGS.IF 

Clear EFLAGS.IF before executing Stepping command and save original
value in DEBUG_AGENT_FLAG. It could avoid pending interrupt issued
during executing Stepping command. Restore EFLAGS.IF after Stepping
command execution finished.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17204 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan 2015-04-27 05:23:43 +00:00 committed by vanjeff
parent 5d51ba2631
commit 994140183f
1 changed files with 42 additions and 9 deletions
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51
SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c
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@ -785,7 +785,7 @@ CommandGo (
}
/**
Exectue Stepping command.
Execute Stepping command.
@param[in] CpuContext Pointer to saved CPU context.
@ -800,6 +800,39 @@ CommandStepping (
Eflags = (IA32_EFLAGS32 *) &CpuContext->Eflags;
Eflags->Bits.TF = 1;
Eflags->Bits.RF = 1;
//
// Save and clear EFLAGS.IF to avoid interrupt happen when executing Stepping
//
SetDebugFlag (DEBUG_AGENT_FLAG_INTERRUPT_FLAG, Eflags->Bits.IF);
Eflags->Bits.IF = 0;
//
// Set Stepping Flag
//
SetDebugFlag (DEBUG_AGENT_FLAG_STEPPING, 1);
}
/**
Do some cleanup after Stepping command done.
@param[in] CpuContext Pointer to saved CPU context.
**/
VOID
CommandSteppingCleanup (
IN DEBUG_CPU_CONTEXT *CpuContext
)
{
IA32_EFLAGS32 *Eflags;
Eflags = (IA32_EFLAGS32 *) &CpuContext->Eflags;
//
// Restore EFLAGS.IF
//
Eflags->Bits.IF = GetDebugFlag (DEBUG_AGENT_FLAG_INTERRUPT_FLAG);
//
// Clear Stepping flag
//
SetDebugFlag (DEBUG_AGENT_FLAG_STEPPING, 0);
}
/**
@ -2066,10 +2099,6 @@ CommandCommunication (
}
mDebugMpContext.BreakAtCpuIndex = (UINT32) (-1);
//
// Set Stepping Flag
//
SetDebugFlag (DEBUG_AGENT_FLAG_STEPPING, 1);
ReleaseMpSpinLock (&mDebugMpContext.DebugPortSpinLock);
//
// Executing stepping command directly without sending ACK packet,
@ -2405,11 +2434,11 @@ InterruptProcess (
if (MultiProcessorDebugSupport()) {
mDebugMpContext.BreakAtCpuIndex = ProcessorIndex;
}
//
// Clear Stepping Flag and restore EFLAGS.IF
//
CommandSteppingCleanup (CpuContext);
SendAckPacket (DEBUG_COMMAND_OK);
//
// Clear Stepping Flag
//
SetDebugFlag (DEBUG_AGENT_FLAG_STEPPING, 0);
CommandCommunication (Vector, CpuContext, BreakReceived);
break;
@ -2582,6 +2611,10 @@ InterruptProcess (
if (MultiProcessorDebugSupport()) {
mDebugMpContext.BreakAtCpuIndex = ProcessorIndex;
}
//
// Clear Stepping flag and restore EFLAGS.IF
//
CommandSteppingCleanup (CpuContext);
SendAckPacket (DEBUG_COMMAND_OK);
} else {
//