/* Set (to enable) or clear (to disable stepping) the SSt bit (bit 8) in Cp0 Debug reg (reg 23, sel 0) */
int mips_ejtag_config_step(struct mips_ejtag *ejtag_info, int enable_step)
{
- int code_len = enable_step ? 6 : 7;
+ struct pracc_queue_info ctx = {.max_code = 7};
+ pracc_queue_init(&ctx);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
- uint32_t *code = malloc(code_len * sizeof(uint32_t));
- if (code == NULL) {
- LOG_ERROR("Out of memory");
- return ERROR_FAIL;
- }
- uint32_t *code_p = code;
-
- *code_p++ = MIPS32_MTC0(1, 31, 0); /* move $1 to COP0 DeSave */
- *code_p++ = MIPS32_MFC0(1, 23, 0), /* move COP0 Debug to $1 */
- *code_p++ = MIPS32_ORI(1, 1, 0x0100); /* set SSt bit in debug reg */
+ pracc_add(&ctx, 0, MIPS32_MFC0(8, 23, 0)); /* move COP0 Debug to $8 */
+ pracc_add(&ctx, 0, MIPS32_ORI(8, 8, 0x0100)); /* set SSt bit in debug reg */
if (!enable_step)
- *code_p++ = MIPS32_XORI(1, 1, 0x0100); /* clear SSt bit in debug reg */
+ pracc_add(&ctx, 0, MIPS32_XORI(8, 8, 0x0100)); /* clear SSt bit in debug reg */
- *code_p++ = MIPS32_MTC0(1, 23, 0); /* move $1 to COP0 Debug */
- *code_p++ = MIPS32_B(NEG16((code_len - 1))); /* jump to start */
- *code_p = MIPS32_MFC0(1, 31, 0); /* move COP0 DeSave to $1 */
+ pracc_add(&ctx, 0, MIPS32_MTC0(8, 23, 0)); /* move $8 to COP0 Debug */
+ pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16(ejtag_info->reg8))); /* restore upper 16 bits of $8 */
+ pracc_add(&ctx, 0, MIPS32_B(NEG16((ctx.code_count + 1)))); /* jump to start */
+ pracc_add(&ctx, 0, MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8))); /* restore lower 16 bits of $8 */
- int retval = mips32_pracc_exec(ejtag_info, code_len, code, 0, NULL, 0, NULL, 1);
-
- free(code);
- return retval;
+ ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, NULL);
+exit:
+ pracc_queue_free(&ctx);
+ return ctx.retval;
}
int mips_ejtag_enter_debug(struct mips_ejtag *ejtag_info)