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Fix the exception occuring in RAM table search issue.

Browse source 
The original search_one_table() function code can only processes the search
for the exception occurring in FLASH/ROM, because the exception and fixup
table usually locate in FLASH. If the exception address is also in
FLASH, it will be OK.
If the exception occurs in RAM, after the u-boot relocation, a
relocation offset should be added.

clean up the code in cpu/74xx_7xx/cpu.c

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
This commit is contained in:
roy zang 2006-12-01 19:01:25 +08:00 committed by Zang Tiefei
parent e0b369e4f7
commit c9c1eeed7d
3 changed files with 23 additions and 21 deletions
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16
cpu/74xx_7xx/cpu.c
View file

@ -108,11 +108,11 @@ get_cpu_type(void)
case 0x8003:
type = CPU_7447A;
break;
case 0x8004:
type = CPU_7448;
break;
default:
break;
}
@ -164,6 +164,10 @@ int checkcpu (void)
str = "MPC7410";
break;
case CPU_7447A:
str = "MPC7447A";
break;
case CPU_7448:
str = "MPC7448";
break;
@ -180,14 +184,6 @@ int checkcpu (void)
str = "MPC7457";
break;
case CPU_7447A:
str = "MPC7447A";
break;
case CPU_7448:
str = "MPC7448";
break;
default:
printf("Unknown CPU -- PVR: 0x%08x\n", pvr);
return -1;

1
include/configs/mpc7448hpc2.h
View file

@ -439,6 +439,5 @@
*/
#define BOOTFLAG_COLD 0x01 /* Normal Power-On: Boot from FLASH */
#define BOOTFLAG_WARM 0x02 /* Software reboot */
#define CFG_EXCEPTION_AFTER_RELOCATE
#define CFG_SERIAL_HANG_IN_EXCEPTION
#endif /* __CONFIG_H */

27
lib_ppc/extable.c
View file

@ -57,16 +57,22 @@ search_one_table(const struct exception_table_entry *first,
long diff;
mid = (last - first) / 2 + first;
#ifdef CFG_EXCEPTION_AFTER_RELOCATE
diff = (mid->insn + gd->reloc_off) - value;
if (diff == 0)
return (mid->fixup + gd->reloc_off);
#else
diff = mid->insn - value;
if (diff == 0)
return mid->fixup;
#endif
else if (diff < 0)
if (mid > CFG_MONITOR_BASE){
/* exception occurs in FLASH, before u-boot relocation.
* No relocation offset is needed.
*/
diff = mid->insn - value;
if (diff == 0)
return mid->fixup;
} else {
/* exception occurs in RAM, after u-boot relocation.
* A relocation offset should be added.
*/
diff = (mid->insn + gd->reloc_off) - value;
if (diff == 0)
return (mid->fixup + gd->reloc_off);
}
if (diff < 0)
first = mid+1;
else
last = mid-1;
@ -83,6 +89,7 @@ search_exception_table(unsigned long addr)
/* There is only the kernel to search. */
ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
/* if the serial port does not hang in exception, printf can be used */
#if !defined(CFG_SERIAL_HANG_IN_EXCEPTION)
if (ex_tab_message)
printf("Bus Fault @ 0x%08lx, fixup 0x%08lx\n", addr, ret);