On 2/24/08, claude vittoria <[EMAIL PROTECTED]> wrote:
> So in qemu I don't get the same comportement. The add of lr = pc + 4
> gives lr = pc + 8 into qemu.
> I think that s->pc += 4 at start of disas_arm_insn alters the result.
> Could you confirm ?
>
> 0x7c add lr, pc, #4
> 0x80 ldr pc, =SystemInterrupt
>
> 0x84 ldr r3, [sp, #PSR_OFF] <= never executed in Qemu
> 0x88 msr spsr_cxsf, r3 @ put cpsr in SPSR
> 0x8c ldmia sp, {r0-r15}^ @ restore Context
The add lr,pc, #4 will put 0x88 into lr. As Daniel wrote, in ARM
mode, when an instruction which address is addr reads the
PC, it will read addr + 8.
Given the mutekh link you provide has no source code for ARM
(at least I couldn't find it), we can't guess where the ldr pc
jumps to.
Laurent
