funnyos/arch/testarm/boot/loader.S - diff

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version 1.3, 2007/11/04 22:39:27

version 1.5, 2007/11/23 13:37:42

Line 61

nop

_vector_irq:

/* decrement pc by one insn */

sub lr, lr, #4

bl irq_trampoline

/* store all system mode registers */

stmdb sp!, {r0-r12, lr}

mrs r0, spsr

/* store sys_mode's cpsr */

msr cpsr, r0

// mrs r1, spsr

// stmdb sp!, {r1}

subs pc, r14, #4

/* pass sp (which now contains struct pcb of interrupted task) to irq_trampoline */

mov r0, sp

bl irq_trampoline

/* load r0-r12 and pc from the stack */

/* note ^ that copies SPSR into CPSR */

/** here we may return to different task (if pcb was changed in the stack memory) **/

ldmia sp!, {r0-r12, pc}^

_vector_fiq:

nop