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Fix horrible stack and CPSR problems

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marcan 2009-01-16 08:47:49 +01:00 committed by bushing
parent f0edf39096
commit 9fb59af098
2 changed files with 8 additions and 13 deletions
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13
irq_asm.S
View File

@ -11,16 +11,13 @@
irq_setup_stack:
@ Switch to IRQ mode
mrs r0, cpsr
bic r1, r0, #0x1f
orr r1, #0x12
msr cpsr, r1
msr cpsr_c, #0xd2
@ Setup interrupt stack
ldr sp, =__stack_addr
add sp, r4
ldr sp, =__irqstack_addr
@ Restore mode
msr cpsr, r0
msr cpsr_c, r0
bx lr
v_irq:
@ -35,12 +32,12 @@ irq_kill:
mrs r1, cpsr
and r0, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
orr r1, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
msr cpsr, r1
msr cpsr_c, r1
bx lr
irq_restore:
mrs r1, cpsr
bic r1, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
orr r1, r1, r0
msr cpsr, r1
msr cpsr_c, r1
bx lr

8
start.S
View File

@ -29,6 +29,9 @@ _start:
.pool
v_reset:
@ Switch to System mode
msr cpsr_c, #0xdf
@ Get loader base from ELF loader
mov r4, r0
@ -38,13 +41,10 @@ v_reset:
@ Set up a stack
ldr sp, =__stack_addr
add sp, r4
@ clear BSS
ldr r1, =__bss_start
add r1, r4
ldr r2, =__bss_end
add r2, r4
mov r3, #0
bss_loop:
@ check for the end
@ -58,9 +58,7 @@ bss_loop:
done_bss:
@ clear BSS2
ldr r1, =__bss2_start
add r1, r4
ldr r2, =__bss2_end
add r2, r4
mov r3, #0
bss2_loop:
@ check for the end