#include "mips32.h"
#include "mips32_pracc.h"
+#define PRACC_FETCH 0
+#define PRACC_STORE 1
+
struct mips32_pracc_context {
uint32_t *local_iparam;
int num_iparam;
return ERROR_OK;
}
-static int mips32_pracc_read_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
+inline void pracc_queue_init(struct pracc_queue_info *ctx)
{
- uint32_t code[] = {
- /* start: */
- MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15, PRACC_UPPER_BASE_ADDR), /* $15 = MIPS32_PRACC_BASE_ADDR */
+ ctx->retval = ERROR_OK;
+ ctx->code_count = 0;
+ ctx->store_count = 0;
- MIPS32_LUI(8, UPPER16((addr + 0x8000))), /* load $8 with modified upper address */
- MIPS32_LW(8, LOWER16(addr), 8), /* lw $8, LOWER16(addr)($8) */
- MIPS32_SW(8, PRACC_OUT_OFFSET, 15), /* sw $8,PRACC_OUT_OFFSET($15) */
+ ctx->pracc_list = malloc(2 * ctx->max_code * sizeof(uint32_t));
+ if (ctx->pracc_list == NULL) {
+ LOG_ERROR("Out of memory");
+ ctx->retval = ERROR_FAIL;
+ }
+}
- MIPS32_LUI(8, UPPER16(ejtag_info->reg8)), /* restore upper 16 bits of reg 8 */
- MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8)), /* restore lower 16 bits of reg 8 */
- MIPS32_B(NEG16(8)), /* b start */
- MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
- };
+inline void pracc_add(struct pracc_queue_info *ctx, uint32_t addr, uint32_t instr)
+{
+ ctx->pracc_list[ctx->max_code + ctx->code_count] = addr;
+ ctx->pracc_list[ctx->code_count++] = instr;
+ if (addr)
+ ctx->store_count++;
+}
+
+inline void pracc_queue_free(struct pracc_queue_info *ctx)
+{
+ if (ctx->code_count > ctx->max_code) /* Only for internal check, will be erased */
+ LOG_ERROR("Internal error, code count: %d > max code: %d", ctx->code_count, ctx->max_code);
+ if (ctx->pracc_list != NULL)
+ free(ctx->pracc_list);
+}
+
+int mips32_pracc_queue_exec(struct mips_ejtag *ejtag_info, struct pracc_queue_info *ctx, uint32_t *buf)
+{
+ if (ejtag_info->mode == 0)
+ return mips32_pracc_exec(ejtag_info, ctx->code_count, ctx->pracc_list, 0, NULL,
+ ctx->store_count, buf, ctx->code_count - 1);
+
+ union scan_in {
+ uint8_t scan_96[12];
+ struct {
+ uint8_t ctrl[4];
+ uint8_t data[4];
+ uint8_t addr[4];
+ } scan_32;
+
+ } *scan_in = malloc(sizeof(union scan_in) * (ctx->code_count + ctx->store_count));
+ if (scan_in == NULL) {
+ LOG_ERROR("Out of memory");
+ return ERROR_FAIL;
+ }
+
+ unsigned num_clocks =
+ ((uint64_t)(ejtag_info->scan_delay) * jtag_get_speed_khz() + 500000) / 1000000;
+
+ uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ALL);
+
+ int scan_count = 0;
+ for (int i = 0; i != 2 * ctx->code_count; i++) {
+ uint32_t data = 0;
+ if (i & 1u) { /* Check store address from previous instruction, if not the first */
+ if (i < 2 || 0 == ctx->pracc_list[ctx->max_code + (i / 2) - 1])
+ continue;
+ } else
+ data = ctx->pracc_list[i / 2];
+
+ jtag_add_clocks(num_clocks);
+ mips_ejtag_add_scan_96(ejtag_info, ejtag_ctrl, data, scan_in[scan_count++].scan_96);
+ }
+
+ int retval = jtag_execute_queue(); /* execute queued scans */
+ if (retval != ERROR_OK)
+ goto exit;
+
+ uint32_t fetch_addr = MIPS32_PRACC_TEXT; /* start address */
+ scan_count = 0;
+ for (int i = 0; i != 2 * ctx->code_count; i++) { /* verify every pracc access */
+ uint32_t store_addr = 0;
+ if (i & 1u) { /* Read store addres from previous instruction, if not the first */
+ store_addr = ctx->pracc_list[ctx->max_code + (i / 2) - 1];
+ if (i < 2 || 0 == store_addr)
+ continue;
+ }
+
+ ejtag_ctrl = buf_get_u32(scan_in[scan_count].scan_32.ctrl, 0, 32);
+ if (!(ejtag_ctrl & EJTAG_CTRL_PRACC)) {
+ LOG_ERROR("Error: access not pending count: %d", scan_count);
+ retval = ERROR_FAIL;
+ goto exit;
+ }
+
+ uint32_t addr = buf_get_u32(scan_in[scan_count].scan_32.addr, 0, 32);
- return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 0, NULL, 1, buf, 1);
+ if (store_addr != 0) {
+ if (!(ejtag_ctrl & EJTAG_CTRL_PRNW)) {
+ LOG_ERROR("Not a store/write access, count: %d", scan_count);
+ retval = ERROR_FAIL;
+ goto exit;
+ }
+ if (addr != store_addr) {
+ LOG_ERROR("Store address mismatch, read: %x expected: %x count: %d",
+ addr, store_addr, scan_count);
+ retval = ERROR_FAIL;
+ goto exit;
+ }
+ int buf_index = (addr - MIPS32_PRACC_PARAM_OUT) / 4;
+ buf[buf_index] = buf_get_u32(scan_in[scan_count].scan_32.data, 0, 32);
+
+ } else {
+ if (ejtag_ctrl & EJTAG_CTRL_PRNW) {
+ LOG_ERROR("Not a fetch/read access, count: %d", scan_count);
+ retval = ERROR_FAIL;
+ goto exit;
+ }
+ if (addr != fetch_addr) {
+ LOG_ERROR("Fetch addr mismatch, read: %x expected: %x count: %d", addr, fetch_addr, scan_count);
+ retval = ERROR_FAIL;
+ goto exit;
+ }
+ fetch_addr += 4;
+ }
+ scan_count++;
+ }
+exit:
+ free(scan_in);
+ return retval;
+}
+
+int mips32_pracc_read_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
+{
+ struct pracc_queue_info ctx = {.max_code = 9};
+ pracc_queue_init(&ctx);
+ if (ctx.retval != ERROR_OK)
+ goto exit;
+
+ pracc_add(&ctx, 0, MIPS32_MTC0(15, 31, 0)); /* move $15 to COP0 DeSave */
+ pracc_add(&ctx, 0, MIPS32_LUI(15, PRACC_UPPER_BASE_ADDR)); /* $15 = MIPS32_PRACC_BASE_ADDR */
+ pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16((addr + 0x8000)))); /* load $8 with modified upper address */
+ pracc_add(&ctx, 0, MIPS32_LW(8, LOWER16(addr), 8)); /* lw $8, LOWER16(addr)($8) */
+ pracc_add(&ctx, MIPS32_PRACC_PARAM_OUT,
+ MIPS32_SW(8, PRACC_OUT_OFFSET, 15)); /* sw $8,PRACC_OUT_OFFSET($15) */
+ pracc_add(&ctx, 0, MIPS32_LUI(8, UPPER16(ejtag_info->reg8))); /* restore upper 16 of $8 */
+ pracc_add(&ctx, 0, MIPS32_ORI(8, 8, LOWER16(ejtag_info->reg8))); /* restore lower 16 of $8 */
+ pracc_add(&ctx, 0, MIPS32_B(NEG16(ctx.code_count + 1))); /* jump to start */
+ pracc_add(&ctx, 0, MIPS32_MFC0(15, 31, 0)); /* move COP0 DeSave to $15 */
+
+ ctx.retval = mips32_pracc_queue_exec(ejtag_info, &ctx, buf);
+exit:
+ pracc_queue_free(&ctx);
+ return ctx.retval;
}
int mips32_pracc_read_mem(struct mips_ejtag *ejtag_info, uint32_t addr, int size, int count, void *buf)
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