diff options
| author | Scott Wood | 2015-04-07 20:20:00 -0500 |
|---|---|---|
| committer | York Sun | 2015-04-20 10:15:29 -0700 |
| commit | 96d2bb952bbf2e5a14f6ad668312cbce3cc4485a (patch) | |
| tree | 9fdff82fc4915b0911f5aa2247243d3ac7a4908b /include/ppc_asm.tmpl | |
| parent | 4913229ed6c668d3127ecd7bf9dea7900844fb82 (diff) | |
powerpc/mpc85xx: Don't relocate exception vectors
Booke does not require exception vectors to be located at address zero.
U-Boot was doing so anyway, simply because that's how it had been done
on other PPC. The downside of this is that once the OS is loaded to
address zero, the exception vectors have been overwritten -- which
makes it difficult to diagnose a crash that happens after that point.
The IVOR setup and trap entry code is simplified somewhat as a result.
Also, there is no longer a need to align individual exceptions on 0x100
byte boundaries.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'include/ppc_asm.tmpl')
| -rw-r--r-- | include/ppc_asm.tmpl | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/ppc_asm.tmpl b/include/ppc_asm.tmpl index 36d59755845..ba166ebdd4d 100644 --- a/include/ppc_asm.tmpl +++ b/include/ppc_asm.tmpl @@ -12,6 +12,8 @@ #ifndef __PPC_ASM_TMPL__ #define __PPC_ASM_TMPL__ +#include <config.h> + /*************************************************************************** * * These definitions simplify the ugly declarations necessary for GOT @@ -243,6 +245,45 @@ */ #define COPY_EE(d, s) rlwimi d,s,0,16,16 #define NOCOPY(d, s) + +#ifdef CONFIG_E500 +#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \ + stw r22,_NIP(r21); \ + stw r23,_MSR(r21); \ + li r23,n; \ + stw r23,TRAP(r21); \ + li r20,msr; \ + copyee(r20,r23); \ + rlwimi r20,r23,0,25,25; \ + mtmsr r20; \ + bl 1f; \ +1: mflr r23; \ + addis r23,r23,(hdlr - 1b)@ha; \ + addi r23,r23,(hdlr - 1b)@l; \ + b transfer_to_handler + +#define STD_EXCEPTION(n, label, hdlr) \ +label: \ + EXCEPTION_PROLOG(SRR0, SRR1); \ + addi r3,r1,STACK_FRAME_OVERHEAD; \ + EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \ + +#define CRIT_EXCEPTION(n, label, hdlr) \ +label: \ + EXCEPTION_PROLOG(CSRR0, CSRR1); \ + addi r3,r1,STACK_FRAME_OVERHEAD; \ + EXC_XFER_TEMPLATE(n, label, hdlr, \ + MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ + +#define MCK_EXCEPTION(n, label, hdlr) \ +label: \ + EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ + addi r3,r1,STACK_FRAME_OVERHEAD; \ + EXC_XFER_TEMPLATE(n, label, hdlr, \ + MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ + +#else /* !E500 */ + #define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \ bl 1f; \ 1: mflr r20; \ @@ -280,4 +321,5 @@ label: \ EXC_XFER_TEMPLATE(label, hdlr, \ MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ +#endif /* !E500 */ #endif /* __PPC_ASM_TMPL__ */ |