| #include "engine/api_version.h" |
| |
| .cpu cortex-m0 |
| .thumb |
| |
| .section .header, "a" |
| |
| .word 0x54494C42 |
| .word do_render // render |
| .word _ZN4blit4tickEm // tick |
| .word _entry_point // init |
| .word __flash_binary_size |
| .word DEVICE_ID // device_id + padding |
| .hword BLIT_API_VERSION_MAJOR |
| .hword BLIT_API_VERSION_MINOR |
| .word __flash_binary_start // unused |
| |
| .section .rodata, "a" |
| .align 4 |
| .global _ZN4blit3apiE |
| _ZN4blit3apiE: |
| .word 0x10000200 |
| |
| .global _ZN4blit8api_dataE |
| _ZN4blit8api_dataE: |
| .word 0x20000000 |
| |
| // based on pico-sdk crt0.S |
| .section .reset, "ax" |
| |
| .type _entry_point,%function |
| .thumb_func |
| .global _entry_point |
| _entry_point: |
| push {r4, lr} |
| // .data copy |
| adr r4, data_cpy_table |
| |
| // assume there is at least one entry |
| 1: |
| ldmia r4!, {r1-r3} |
| cmp r1, #0 |
| beq 2f |
| bl data_cpy |
| b 1b |
| 2: |
| |
| // Zero out the BSS |
| ldr r1, =__bss_start__ |
| ldr r2, =__bss_end__ |
| movs r0, #0 |
| b bss_fill_test |
| bss_fill_loop: |
| stm r1!, {r0} |
| bss_fill_test: |
| cmp r1, r2 |
| bne bss_fill_loop |
| |
| platform_entry: // symbol for stack traces |
| bl do_init |
| pop {r4, pc} |
| |
| data_cpy_loop: |
| ldm r1!, {r0} |
| stm r2!, {r0} |
| data_cpy: |
| cmp r2, r3 |
| blo data_cpy_loop |
| bx lr |
| |
| .align 2 |
| data_cpy_table: |
| .word __etext |
| .word __data_start__ |
| .word __data_end__ |
| |
| .word 0 // null terminator |
