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ArmPlatformPkg/PrePi: Fixed register corruption 

The commit on Fri Dec 6 2013: "ArmPlatformPkg/ArmPlatformStackLib:
Do not directly use PcdArmPrimaryCore" has made the function
ArmPlatformStackSet() overwrites the registers r6 and r7.
These registers are used by PrePi to store the MPIDR and the the base
of the system memory region used by UEFI.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15167 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin 2014-01-23 00:59:08 +00:00 committed by oliviermartin
parent eb98fc6de8
commit c2d87a49f7
2 changed files with 34 additions and 34 deletions
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34
ArmPlatformPkg/PrePi/Arm/ModuleEntryPoint.S
View File

@ -1,5 +1,5 @@
//
// Copyright (c) 2011-2013, ARM Limited. All rights reserved.
// Copyright (c) 2011-2014, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@ -38,7 +38,7 @@ ASM_PFX(_ModuleEntryPoint):
// Get ID of this CPU in Multicore system
bl ASM_PFX(ArmReadMpidr)
// Keep a copy of the MpId register value
mov r6, r0
mov r8, r0
_SetSVCMode:
// Enter SVC mode, Disable FIQ and IRQ
@ -83,47 +83,47 @@ _SetupStack:
// Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
// one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
// top of the memory space)
adds r7, r1, #1
adds r9, r1, #1
bcs _SetupOverflowStack
_SetupAlignedStack:
mov r1, r7
mov r1, r9
b _GetBaseUefiMemory
_SetupOverflowStack:
// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
// aligned (4KB)
LoadConstantToReg (EFI_PAGE_MASK, r7)
and r7, r7, r1
sub r1, r1, r7
LoadConstantToReg (EFI_PAGE_MASK, r9)
and r9, r9, r1
sub r1, r1, r9
_GetBaseUefiMemory:
// Calculate the Base of the UEFI Memory
sub r7, r1, r4
sub r9, r1, r4
_GetStackBase:
// r1 = The top of the Mpcore Stacks
// Stack for the primary core = PrimaryCoreStack
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
sub r8, r1, r2
sub r10, r1, r2
// Stack for the secondary core = Number of Cores - 1
LoadConstantToReg (FixedPcdGet32(PcdCoreCount), r0)
sub r0, r0, #1
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r1)
mul r1, r1, r0
sub r8, r8, r1
sub r10, r10, r1
// r8 = The base of the MpCore Stacks (primary stack & secondary stacks)
mov r0, r8
mov r1, r6
// r10 = The base of the MpCore Stacks (primary stack & secondary stacks)
mov r0, r10
mov r1, r8
//ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
bl ASM_PFX(ArmPlatformStackSet)
// Is it the Primary Core ?
mov r0, r6
mov r0, r8
bl ASM_PFX(ArmPlatformIsPrimaryCore)
cmp r0, #1
bne _PrepareArguments
@ -134,9 +134,9 @@ _ReserveGlobalVariable:
InitializePrimaryStack(r0, r1)
_PrepareArguments:
mov r0, r6
mov r1, r7
mov r2, r8
mov r0, r8
mov r1, r9
mov r2, r10
mov r3, sp
// Move sec startup address into a data register

34
ArmPlatformPkg/PrePi/Arm/ModuleEntryPoint.asm
View File

@ -1,5 +1,5 @@
//
// Copyright (c) 2011-2013, ARM Limited. All rights reserved.
// Copyright (c) 2011-2014, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@ -40,7 +40,7 @@ _ModuleEntryPoint
// Get ID of this CPU in Multicore system
bl ArmReadMpidr
// Keep a copy of the MpId register value
mov r6, r0
mov r8, r0
_SetSVCMode
// Enter SVC mode, Disable FIQ and IRQ
@ -85,47 +85,47 @@ _SetupStack
// Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
// one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
// top of the memory space)
adds r7, r1, #1
adds r9, r1, #1
bcs _SetupOverflowStack
_SetupAlignedStack
mov r1, r7
mov r1, r9
b _GetBaseUefiMemory
_SetupOverflowStack
// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
// aligned (4KB)
LoadConstantToReg (EFI_PAGE_MASK, r7)
and r7, r7, r1
sub r1, r1, r7
LoadConstantToReg (EFI_PAGE_MASK, r9)
and r9, r9, r1
sub r1, r1, r9
_GetBaseUefiMemory
// Calculate the Base of the UEFI Memory
sub r7, r1, r4
sub r9, r1, r4
_GetStackBase
// r1 = The top of the Mpcore Stacks
// Stack for the primary core = PrimaryCoreStack
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
sub r8, r1, r2
sub r10, r1, r2
// Stack for the secondary core = Number of Cores - 1
LoadConstantToReg (FixedPcdGet32(PcdCoreCount), r0)
sub r0, r0, #1
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r1)
mul r1, r1, r0
sub r8, r8, r1
sub r10, r10, r1
// r8 = The base of the MpCore Stacks (primary stack & secondary stacks)
mov r0, r8
mov r1, r6
// r10 = The base of the MpCore Stacks (primary stack & secondary stacks)
mov r0, r10
mov r1, r8
//ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
bl ArmPlatformStackSet
// Is it the Primary Core ?
mov r0, r6
mov r0, r8
bl ArmPlatformIsPrimaryCore
cmp r0, #1
bne _PrepareArguments
@ -136,9 +136,9 @@ _ReserveGlobalVariable
InitializePrimaryStack r0, r1
_PrepareArguments
mov r0, r6
mov r1, r7
mov r2, r8
mov r0, r8
mov r1, r9
mov r2, r10
mov r3, sp
// Move sec startup address into a data register