- static const uint16_t cortex_m3_crc_code[] = {
- 0x4602, /* mov r2, r0 */
- 0xF04F, 0x30FF, /* mov r0, #0xffffffff */
- 0x460B, /* mov r3, r1 */
- 0xF04F, 0x0400, /* mov r4, #0 */
- 0xE013, /* b ncomp */
- /* nbyte: */
- 0x5D11, /* ldrb r1, [r2, r4] */
- 0xF8DF, 0x7028, /* ldr r7, CRC32XOR */
- 0xEA80, 0x6001, /* eor r0, r0, r1, asl #24 */
-
- 0xF04F, 0x0500, /* mov r5, #0 */
- /* loop: */
- 0x2800, /* cmp r0, #0 */
- 0xEA4F, 0x0640, /* mov r6, r0, asl #1 */
- 0xF105, 0x0501, /* add r5, r5, #1 */
- 0x4630, /* mov r0, r6 */
- 0xBFB8, /* it lt */
- 0xEA86, 0x0007, /* eor r0, r6, r7 */
- 0x2D08, /* cmp r5, #8 */
- 0xD1F4, /* bne loop */
-
- 0xF104, 0x0401, /* add r4, r4, #1 */
- /* ncomp: */
- 0x429C, /* cmp r4, r3 */
- 0xD1E9, /* bne nbyte */
- /* end: */
- 0xE7FE, /* b end */
- 0x1DB7, 0x04C1 /* CRC32XOR: .word 0x04C11DB7 */
+ /* see contrib/loaders/checksum/armv7m_crc.s for src */
+
+ static const uint8_t cortex_m3_crc_code[] = {
+ /* main: */
+ 0x02, 0x46, /* mov r2, r0 */
+ 0x00, 0x20, /* movs r0, #0 */
+ 0xC0, 0x43, /* mvns r0, r0 */
+ 0x0A, 0x4E, /* ldr r6, CRC32XOR */
+ 0x0B, 0x46, /* mov r3, r1 */
+ 0x00, 0x24, /* movs r4, #0 */
+ 0x0D, 0xE0, /* b ncomp */
+ /* nbyte: */
+ 0x11, 0x5D, /* ldrb r1, [r2, r4] */
+ 0x09, 0x06, /* lsls r1, r1, #24 */
+ 0x48, 0x40, /* eors r0, r0, r1 */
+ 0x00, 0x25, /* movs r5, #0 */
+ /* loop: */
+ 0x00, 0x28, /* cmp r0, #0 */
+ 0x02, 0xDA, /* bge notset */
+ 0x40, 0x00, /* lsls r0, r0, #1 */
+ 0x70, 0x40, /* eors r0, r0, r6 */
+ 0x00, 0xE0, /* b cont */
+ /* notset: */
+ 0x40, 0x00, /* lsls r0, r0, #1 */
+ /* cont: */
+ 0x01, 0x35, /* adds r5, r5, #1 */
+ 0x08, 0x2D, /* cmp r5, #8 */
+ 0xF6, 0xD1, /* bne loop */
+ 0x01, 0x34, /* adds r4, r4, #1 */
+ /* ncomp: */
+ 0x9C, 0x42, /* cmp r4, r3 */
+ 0xEF, 0xD1, /* bne nbyte */
+ 0x00, 0xBE, /* bkpt #0 */
+ 0xB7, 0x1D, 0xC1, 0x04 /* CRC32XOR: .word 0x04c11db7 */