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Allocate memory in DebugSupport beforehand, in order to avoid calling memory allocation services in high TPL level.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2556 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
xli24
2007-04-11 03:15:15 +00:00
parent 7e9f4e1d8e
commit 735561c27f
7 changed files with 114 additions and 81 deletions
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84
EdkModulePkg/Universal/DebugSupport/Dxe/Ia32/plDebugSupport.c
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@@ -46,41 +46,32 @@ Returns:
{
UINT8 *StubCopy;
StubCopy = *Stub;
//
// First, allocate a new buffer and copy the stub code into it
// Fixup the stub code for this vector
//
*Stub = AllocatePool (StubSize);
if (*Stub != NULL) {
StubCopy = *Stub;
CopyMem (StubCopy, InterruptEntryStub, StubSize);
//
// Next fixup the stub code for this vector
//
// The stub code looks like this:
//
// 00000000 89 25 00000004 R mov AppEsp, esp ; save stack top
// 00000006 BC 00008014 R mov esp, offset DbgStkBot ; switch to debugger stack
// 0000000B 6A 00 push 0 ; push vector number - will be modified before installed
// 0000000D E9 db 0e9h ; jump rel32
// 0000000E 00000000 dd 0 ; fixed up to relative address of CommonIdtEntry
//
// The stub code looks like this:
//
// 00000000 89 25 00000004 R mov AppEsp, esp ; save stack top
// 00000006 BC 00008014 R mov esp, offset DbgStkBot ; switch to debugger stack
// 0000000B 6A 00 push 0 ; push vector number - will be modified before installed
// 0000000D E9 db 0e9h ; jump rel32
// 0000000E 00000000 dd 0 ; fixed up to relative address of CommonIdtEntry
//
//
// poke in the exception type so the second push pushes the exception type
//
StubCopy[0x0c] = (UINT8) ExceptionType;
//
// poke in the exception type so the second push pushes the exception type
//
StubCopy[0x0c] = (UINT8) ExceptionType;
//
// fixup the jump target to point to the common entry
//
*(UINT32 *) &StubCopy[0x0e] = (UINT32) CommonIdtEntry - (UINT32) &StubCopy[StubSize];
//
// fixup the jump target to point to the common entry
//
*(UINT32 *) &StubCopy[0x0e] = (UINT32) CommonIdtEntry - (UINT32) &StubCopy[StubSize];
return EFI_SUCCESS;
}
return EFI_OUT_OF_RESOURCES;
return EFI_SUCCESS;
}
STATIC
@@ -151,8 +142,6 @@ Returns:
OldIntFlagState = WriteInterruptFlag (0);
WriteIdt (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));
FreePool ((VOID *) (UINTN) IdtEntryTable[ExceptionType].StubEntry);
ZeroMem (&IdtEntryTable[ExceptionType], sizeof (IDT_ENTRY));
WriteInterruptFlag (OldIntFlagState);
return EFI_SUCCESS;
@@ -362,16 +351,37 @@ Returns:
--*/
{
EFI_EXCEPTION_TYPE ExceptionType;
if (!FxStorSupport ()) {
return EFI_UNSUPPORTED;
} else {
IdtEntryTable = AllocateZeroPool (sizeof (IDT_ENTRY) * NUM_IDT_ENTRIES);
if (IdtEntryTable != NULL) {
return EFI_SUCCESS;
} else {
return EFI_OUT_OF_RESOURCES;
}
IdtEntryTable = AllocateZeroPool (sizeof (IDT_ENTRY) * NUM_IDT_ENTRIES);
if (IdtEntryTable == NULL) {
return EFI_OUT_OF_RESOURCES;
}
for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {
IdtEntryTable[ExceptionType].StubEntry = (DEBUG_PROC) (UINTN) AllocatePool (StubSize);
if (IdtEntryTable[ExceptionType].StubEntry == NULL) {
goto ErrorCleanup;
}
CopyMem ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry, InterruptEntryStub, StubSize);
}
return EFI_SUCCESS;
ErrorCleanup:
for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {
if (IdtEntryTable[ExceptionType].StubEntry != NULL) {
FreePool ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);
}
}
FreePool (IdtEntryTable);
return EFI_OUT_OF_RESOURCES;
}
EFI_STATUS