diff options
Diffstat (limited to 'EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm')
| -rwxr-xr-x | EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm | 78 |
1 files changed, 39 insertions, 39 deletions
diff --git a/EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm b/EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm index c70fb92482..611e83d7da 100755 --- a/EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm +++ b/EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm @@ -1,4 +1,4 @@ -//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
//
// Use ARMv6 instruction to operate on a single stack
//
@@ -21,7 +21,7 @@ This is the stack constructed by the exception handler (low address to high address)
# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
Reg Offset
- === ======
+ === ======
R0 0x00 # stmfd SP!,{R0-R12}
R1 0x04
R2 0x08
@@ -43,15 +43,15 @@ This is the stack constructed by the exception handler (low address to high addr DFAR 0x48
IFSR 0x4c
IFAR 0x50
-
+
LR 0x54 # SVC Link register (we need to restore it)
-
- LR 0x58 # pushed by srsfd
- CPSR 0x5c
+
+ LR 0x58 # pushed by srsfd
+ CPSR 0x5c
*/
-
-
+
+
EXPORT ExceptionHandlersStart
EXPORT ExceptionHandlersEnd
EXPORT CommonExceptionEntry
@@ -60,7 +60,7 @@ This is the stack constructed by the exception handler (low address to high addr PRESERVE8
AREA DxeExceptionHandlers, CODE, READONLY
-
+
//
// This code gets copied to the ARM vector table
// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
@@ -101,7 +101,7 @@ UndefinedInstructionEntry stmfd SP!,{R0-R12} ; Store the register state
mov R0,#1 ; ExceptionType
- ldr R1,CommonExceptionEntry;
+ ldr R1,CommonExceptionEntry;
bx R1
SoftwareInterruptEntry
@@ -173,55 +173,55 @@ CommonExceptionEntry ExceptionHandlersEnd
//
-// This code runs from CpuDxe driver loaded address. It is patched into
+// This code runs from CpuDxe driver loaded address. It is patched into
// CommonExceptionEntry.
//
AsmCommonExceptionEntry
mrc p15, 0, R1, c6, c0, 2 ; Read IFAR
- str R1, [SP, #0x50] ; Store it in EFI_SYSTEM_CONTEXT_ARM.IFAR
-
+ str R1, [SP, #0x50] ; Store it in EFI_SYSTEM_CONTEXT_ARM.IFAR
+
mrc p15, 0, R1, c5, c0, 1 ; Read IFSR
str R1, [SP, #0x4c] ; Store it in EFI_SYSTEM_CONTEXT_ARM.IFSR
-
+
mrc p15, 0, R1, c6, c0, 0 ; Read DFAR
str R1, [SP, #0x48] ; Store it in EFI_SYSTEM_CONTEXT_ARM.DFAR
-
+
mrc p15, 0, R1, c5, c0, 0 ; Read DFSR
str R1, [SP, #0x44] ; Store it in EFI_SYSTEM_CONTEXT_ARM.DFSR
-
- ldr R1, [SP, #0x5c] ; srsfd saved pre-exception CPSR on the stack
+
+ ldr R1, [SP, #0x5c] ; srsfd saved pre-exception CPSR on the stack
str R1, [SP, #0x40] ; Store it in EFI_SYSTEM_CONTEXT_ARM.CPSR
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
and R3, R1, #0x1f ; Check CPSR to see if User or System Mode
cmp R3, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1df))
- cmpne R3, #0x10 ;
+ cmpne R3, #0x10 ;
stmeqed R2, {lr}^ ; save unbanked lr
- ; else
+ ; else
stmneed R2, {lr} ; save SVC lr
- ldr R5, [SP, #0x58] ; PC is the LR pushed by srsfd
+ ldr R5, [SP, #0x58] ; PC is the LR pushed by srsfd
; Check to see if we have to adjust for Thumb entry
sub r4, r0, #1 ; if (ExceptionType == 1 || ExceptionType ==2)) {
- cmp r4, #1 ; // UND & SVC have differnt LR adjust for Thumb
+ cmp r4, #1 ; // UND & SVC have differnt LR adjust for Thumb
bhi NoAdjustNeeded
-
- tst r1, #0x20 ; if ((CPSR & T)) == T) { // Thumb Mode on entry
+
+ tst r1, #0x20 ; if ((CPSR & T)) == T) { // Thumb Mode on entry
addne R5, R5, #2 ; PC += 2;
- str R5,[SP,#0x58] ; Update LR value pused by srsfd
-
+ str R5,[SP,#0x58] ; Update LR value pused by srsfd
+
NoAdjustNeeded
str R5, [SP, #0x3c] ; Store it in EFI_SYSTEM_CONTEXT_ARM.PC
-
- sub R1, SP, #0x60 ; We pused 0x60 bytes on the stack
+
+ sub R1, SP, #0x60 ; We pused 0x60 bytes on the stack
str R1, [SP, #0x34] ; Store it in EFI_SYSTEM_CONTEXT_ARM.SP
-
- ; R0 is ExceptionType
- mov R1,SP ; R1 is SystemContext
-/*
+ ; R0 is ExceptionType
+ mov R1,SP ; R1 is SystemContext
+
+/*
VOID
EFIAPI
GdbExceptionHandler (
@@ -231,29 +231,29 @@ GdbExceptionHandler ( */
blx GdbExceptionHandler ; Call exception handler
-
+
ldr R1,[SP,#0x3c] ; EFI_SYSTEM_CONTEXT_ARM.PC
- str R1,[SP,#0x58] ; Store it back to srsfd stack slot so it can be restored
+ str R1,[SP,#0x58] ; Store it back to srsfd stack slot so it can be restored
ldr R1,[SP,#0x40] ; EFI_SYSTEM_CONTEXT_ARM.CPSR
- str R1,[SP,#0x5c] ; Store it back to srsfd stack slot so it can be restored
-
+ str R1,[SP,#0x5c] ; Store it back to srsfd stack slot so it can be restored
+
add R3, SP, #0x54 ; Make R3 point to SVC LR saved on entry
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
and R1, R1, #0x1f ; Check to see if User or System Mode
cmp R1, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1f))
- cmpne R1, #0x10 ;
+ cmpne R1, #0x10 ;
ldmeqed R2, {lr}^ ; restore unbanked lr
; else
ldmneed R3, {lr} ; restore SVC lr, via ldmfd SP!, {LR}
-
+
ldmfd SP!,{R0-R12} ; Restore general purpose registers
; Exception handler can not change SP
-
+
add SP,SP,#0x20 ; Clear out the remaining stack space
ldmfd SP!,{LR} ; restore the link register for this context
rfefd SP! ; return from exception via srsfd stack slot
-
+
END
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