diff options
Diffstat (limited to 'cpu/mpc824x/start.S')
| -rw-r--r-- | cpu/mpc824x/start.S | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/cpu/mpc824x/start.S b/cpu/mpc824x/start.S index bd9706d..18b8e61 100644 --- a/cpu/mpc824x/start.S +++ b/cpu/mpc824x/start.S @@ -278,7 +278,14 @@ SystemCall: add r11,r11,r0 lwz r11,0(r11) - li r12,0xd00-4*3 /* save LR & SRRx */ + li r20,0xd00-4 /* Get stack pointer */ + lwz r12,0(r20) + subi r12,r12,12 /* Adjust stack pointer */ + li r0,0xc00+_end_back-SystemCall + cmplw 0, r0, r12 /* Check stack overflow */ + bgt 1f + stw r12,0(r20) + mflr r0 stw r0,0(r12) mfspr r0,SRR0 @@ -303,7 +310,9 @@ _back: mtmsr r11 SYNC - li r12,0xd00-4*3 /* restore regs */ + li r12,0xd00-4 /* restore regs */ + lwz r12,0(r12) + lwz r11,0(r12) mtlr r11 lwz r11,4(r12) @@ -311,8 +320,13 @@ _back: lwz r11,8(r12) mtspr SRR1,r11 + addi r12,r12,12 /* Adjust stack pointer */ + li r20,0xd00-4 + stw r12,0(r20) + SYNC rfi +_end_back: STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException) |