FreeCalypso > hg > freecalypso-sw
changeset 313:9df7f9c72e17
ARM exception handling: stack setup added
| author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
|---|---|
| date | Mon, 17 Mar 2014 07:47:18 +0000 |
| parents | f05ae34f7ca0 |
| children | 48c08499cede |
| files | gsm-fw/nucleus/asm_defs.h gsm-fw/nucleus/init.S |
| diffstat | 2 files changed, 17 insertions(+), 0 deletions(-) [+] |
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--- a/gsm-fw/nucleus/asm_defs.h Mon Mar 17 07:37:28 2014 +0000 +++ b/gsm-fw/nucleus/asm_defs.h Mon Mar 17 07:47:18 2014 +0000 @@ -53,6 +53,8 @@ #define FIQ_BIT 0x40 /* Interrupt bit of CPSR and SPSR */ #define IRQ_BIT_OR_FIQ_BIT 0xC0 /* IRQ or FIQ interrupt bit of CPSR */ /* and SPSR */ +#define ABORT_MODE 0x17 +#define UNDEF_MODE 0x1B /* ********************************************
--- a/gsm-fw/nucleus/init.S Mon Mar 17 07:37:28 2014 +0000 +++ b/gsm-fw/nucleus/init.S Mon Mar 17 07:47:18 2014 +0000 @@ -261,6 +261,21 @@ LDR sp,FIQ_Stack_SP @ Setup FIQ stack pointer +@ set up abort and undef mode stacks - code from TI + MRS a1,CPSR @ Pickup current CPSR + BIC a1,a1,#MODE_MASK @ Clear the mode bits + ORR a1,a1,#ABORT_MODE @ Set the Abort mode bits + MSR CPSR,a1 @ Move to the Abort mode + LDR sp,=_Except_Stack_SP @ Setup Abort stack pointer + + MRS a1,CPSR @ Pickup current CPSR + BIC a1,a1,#MODE_MASK @ Clear the mode bits + ORR a1,a1,#UNDEF_MODE @ Set the Undefined mode bits + MSR CPSR,a1 @ Move to the Undefined mode + LDR sp,=_Except_Stack_SP @ Setup Undefined stack pointer + @ (should never be used) + +@ original Nucleus code continues MRS r0,CPSR @ Pickup current CPSR BIC r0,r0,#MODE_MASK @ Clear mode bits ORR r0,r0,#SUP_MODE @ Set the supervisor mode bits