diff options
| -rw-r--r-- | src/boot.S | 31 |
1 files changed, 5 insertions, 26 deletions
@@ -24,44 +24,23 @@ reset: // save cpsr. mrs r0, cpsr - // setup sp in IRQ mode. - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x12 - ///msr cpsr_c,r1 + // Setup sp in IRQ mode. cps #0x12 mov sp,#0x4000 - // setup sp in FIQ mode. - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x11 - ///msr cpsr_c,r1 + // Setup sp in FIQ mode. cps #0x11 mov sp,#0x2000 - // setup sp in UNDEF mode. - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x1B - ///msr cpsr_c,r1 + // Setup sp in UNDEF mode. cps #0x1B mov sp,#0x1000 - // setup sp in ABORT mode. - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x17 - ///msr cpsr_c,r1 + // Setup sp in ABORT mode. cps #0x17 mov sp,#0x0800 // Setup sp in USR/SYS mode. - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x1f - ///msr cpsr_c,r1 cps #0x1f mov sp,#0x6000 - // restore to SVC (in the case of a reset) - ///bic r1, r0, #0x1f - ///orr r1, r1, #0x13 - ///msr cpsr_c, r1 - //msr cpsr_c, r0 - - // setup the stack in SVC mode. + // Setup sp in SVC mode. cps #0x13 mov sp, #0x8000 |