projects / packages / crossarm-gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 1f0e1264 PS |
1 | |
| 2 | .set SYSTEM_MODE, 0x1F | |
| 3 | .set UNDEFINED_MODE, 0x1B | |
| 4 | .set ABORT_MODE, 0x17 | |
| 5 | .set SUPERVISOR_MODE, 0x13 | |
| 6 | .set IRQ_MODE, 0x12 | |
| 7 | .set FIQ_MODE, 0x11 | |
| 8 | .set USER_MODE, 0x10 | |
| 9 | ||
| 10 | .text | |
| 11 | .arm | |
| 12 | .org 0 | |
| 13 | .align 0 | |
| 14 | ||
| 15 | # exception vectors | |
| 16 | ||
| 17 | b reset_handler | |
| 18 | ldr pc, undefined_instruction_handler_addr | |
| 19 | ldr pc, software_interrupt_handler_addr | |
| 20 | ldr pc, prefetch_abort_handler_addr | |
| 21 | ldr pc, data_abort_handler_addr | |
| 22 | ldr pc, endless_loop /* ARM-reserved vector */ | |
| 23 | ldr pc, irq_handler_addr | |
| 24 | ldr pc, fiq_handler_addr | |
| 25 | ||
| 26 | undefined_instruction_handler_addr: .long undefined_instruction_handler | |
| 27 | software_interrupt_handler_addr: .long software_interrupt_handler | |
| 28 | prefetch_abort_handler_addr: .long prefetch_abort_handler | |
| 29 | data_abort_handler_addr: .long data_abort_handler | |
| 30 | irq_handler_addr: .long irq_handler | |
| 31 | fiq_handler_addr: .long fiq_handler | |
| 32 | ||
| 33 | .global reset_handler | |
| 34 | reset_handler: | |
| 35 | ||
| 36 | msr cpsr_c, #UNDEFINED_MODE | |
| 37 | ldr sp, =__UNDEFINED_SP__ | |
| 38 | msr cpsr_c, #ABORT_MODE | |
| 39 | ldr sp, =__ABORT_SP__ | |
| 40 | msr cpsr_c, #IRQ_MODE | |
| 41 | ldr sp, =__IRQ_SP__ | |
| 42 | msr cpsr_c, #FIQ_MODE | |
| 43 | ldr sp, =__FIQ_SP__ | |
| 44 | msr cpsr_c, #SUPERVISOR_MODE | |
| 45 | ldr sp, =__SUPERVISOR_SP__ | |
| 46 | ||
| 47 | # setup a default stack limit (when compiled with "-mapcs-stack-check"). | |
| 48 | # sub sl, sp, #__USER_STACK_SIZE__ | |
| 49 | ||
| 50 | # relocate .data(rw) section (copy from FLASH to RAM). | |
| 51 | ||
| 52 | ldr r1, =__text_end__ | |
| 53 | ldr r2, =__data_start__ | |
| 54 | ldr r3, =__data_end__ | |
| 55 | ||
| 56 | reset_handler_L01: | |
| 57 | ||
| 58 | cmp r2, r3 | |
| 59 | ldrlo r0, [r1], #4 | |
| 60 | strlo r0, [r2], #4 | |
| 61 | blo reset_handler_L01 | |
| 62 | ||
| 63 | # clear .bss(rw) section. | |
| 64 | ||
| 65 | mov r0, #0 | |
| 66 | ldr r1, =__bss_start__ | |
| 67 | ldr r2, =__bss_end__ | |
| 68 | ||
| 69 | reset_handler_L02: | |
| 70 | ||
| 71 | cmp r1, r2 | |
| 72 | strlo r0, [r1], #4 | |
| 73 | blo reset_handler_L02 | |
| 74 | ||
| 75 | # set up arguments to main() and call. | |
| 76 | ||
| 77 | mov r0, #0 | |
| 78 | mov r1, #0 | |
| 79 | bl main | |
| 80 | ||
| 81 | .global endless_loop | |
| 82 | endless_loop: | |
| 83 | b endless_loop | |
| 84 | ||
| 85 | .end |