diff options
Diffstat (limited to 'bootloader.s')
| -rw-r--r-- | bootloader.s | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/bootloader.s b/bootloader.s new file mode 100644 index 0000000..e92e916 --- /dev/null +++ b/bootloader.s @@ -0,0 +1,80 @@ +.cpu arm7tdmi + +.arm +b reset + +.arm +b undefined_instruction + +.arm +b software_interrupt + +.arm +b prefetch_abort + +.arm +b data_abort + +.arm +b interrupt_request + +.arm +b fast_interrupt_request + +.func +reset: + ldr lr, .image_entry_point + bx lr + +.endfunc + +.align +.image_entry_point: + .word 0x08000000 + +.func +undefined_instruction: + b undefined_instruction +.endfunc + +.func +software_interrupt: + ldr r0, =.software_interrupt_impl + mov r1, pc + bx r0 + movs pc, lr +.endfunc + +.thumb + +.func +.thumb_func +.software_interrupt_impl: + mov r0, lr + sub r0, #0x4 + ldr r0, [r0] + bx r1 + +.endfunc + +.arm + +.func +prefetch_abort: + b prefetch_abort +.endfunc + +.func +data_abort: + b data_abort +.endfunc + +.func +interrupt_request: + b interrupt_request +.endfunc + +.func +fast_interrupt_request: + b fast_interrupt_request +.endfunc |