#include "register.h"
#include "target_request.h"
#include "target_type.h"
-#include "arm_opcodes.h"
+#include "armv8_opcodes.h"
#include <helper/time_support.h>
static int aarch64_poll(struct target *target);
static int aarch64_mmu(struct target *target, int *enabled);
static int aarch64_virt2phys(struct target *target,
target_addr_t virt, target_addr_t *phys);
-static int aarch64_read_apb_ab_memory(struct target *target,
+static int aarch64_read_apb_ap_memory(struct target *target,
uint64_t address, uint32_t size, uint32_t count, uint8_t *buffer);
static int aarch64_instr_write_data_r0(struct arm_dpm *dpm,
uint32_t opcode, uint32_t data);
return ERROR_OK;
}
-static int aarch64_write_apb_ab_memory(struct target *target,
+static int aarch64_write_apb_ap_memory(struct target *target,
uint64_t address, uint32_t size,
uint32_t count, const uint8_t *buffer)
{
struct reg *reg;
uint32_t dscr;
uint8_t *tmp_buff = NULL;
- uint32_t i = 0;
LOG_DEBUG("Writing APB-AP memory address 0x%" PRIx64 " size %" PRIu32 " count%" PRIu32,
address, size, count);
reg->dirty = true;
/* clear any abort */
- retval = mem_ap_write_atomic_u32(armv8->debug_ap, armv8->debug_base + CPUDBG_DRCR, 1<<2);
+ retval = mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DRCR, DRCR_CSE);
if (retval != ERROR_OK)
return retval;
- /* This algorithm comes from either :
- * Cortex-A8 TRM Example 12-25
- * Cortex-R4 TRM Example 11-26
- * (slight differences)
- */
+
+ /* This algorithm comes from DDI0487A.g, chapter J9.1 */
/* The algorithm only copies 32 bit words, so the buffer
* should be expanded to include the words at either end.
/* First bytes not aligned - read the 32 bit word to avoid corrupting
* the other bytes in the word.
*/
- retval = aarch64_read_apb_ab_memory(target, (address & ~0x3), 4, 1, tmp_buff);
+ retval = aarch64_read_apb_ap_memory(target, (address & ~0x3), 4, 1, tmp_buff);
if (retval != ERROR_OK)
goto error_free_buff_w;
}
/* Read the last word to avoid corruption during 32 bit write */
int mem_offset = (total_u32-1) * 4;
- retval = aarch64_read_apb_ab_memory(target, (address & ~0x3) + mem_offset, 4, 1, &tmp_buff[mem_offset]);
+ retval = aarch64_read_apb_ap_memory(target, (address & ~0x3) + mem_offset, 4, 1, &tmp_buff[mem_offset]);
if (retval != ERROR_OK)
goto error_free_buff_w;
}
if (retval != ERROR_OK)
goto error_free_buff_w;
- /* Set DTR mode to Normal*/
- dscr = (dscr & ~DSCR_EXT_DCC_MASK) | DSCR_EXT_DCC_NON_BLOCKING;
+ /* Set Normal access mode */
+ dscr = (dscr & ~DSCR_MA);
retval = mem_ap_write_atomic_u32(armv8->debug_ap,
armv8->debug_base + CPUDBG_DSCR, dscr);
- if (retval != ERROR_OK)
- goto error_free_buff_w;
- if (size > 4) {
- LOG_WARNING("reading size >4 bytes not yet supported");
- goto error_unset_dtr_w;
- }
+ if (arm->core_state == ARM_STATE_AARCH64) {
+ /* Write X0 with value 'address' using write procedure */
+ /* Step 1.a+b - Write the address for read access into DBGDTR_EL0 */
+ retval += aarch64_write_dcc_64(armv8, address & ~0x3ULL);
+ /* Step 1.c - Copy value from DTR to R0 using instruction mrs DBGDTR_EL0, x0 */
+ retval += aarch64_exec_opcode(target,
+ ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr);
+ } else {
+ /* Write R0 with value 'address' using write procedure */
+ /* Step 1.a+b - Write the address for read access into DBGDTRRX */
+ retval += aarch64_write_dcc(armv8, address & ~0x3ULL);
+ /* Step 1.c - Copy value from DTR to R0 using instruction mrc DBGDTRTXint, r0 */
+ retval += aarch64_exec_opcode(target,
+ T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), &dscr);
- retval = aarch64_instr_write_data_dcc_64(arm->dpm, 0xd5330401, address+4);
+ }
+ /* Step 1.d - Change DCC to memory mode */
+ dscr = dscr | DSCR_MA;
+ retval += mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
if (retval != ERROR_OK)
goto error_unset_dtr_w;
- dscr = DSCR_INSTR_COMP;
- while (i < count * size) {
- uint32_t val;
-
- memcpy(&val, &buffer[i], size);
- retval = aarch64_instr_write_data_dcc(arm->dpm, 0xd5330500, val);
- if (retval != ERROR_OK)
- goto error_unset_dtr_w;
-
- retval = aarch64_exec_opcode(target, 0xb81fc020, &dscr);
- if (retval != ERROR_OK)
- goto error_unset_dtr_w;
- retval = aarch64_exec_opcode(target, 0x91001021, &dscr);
- if (retval != ERROR_OK)
- goto error_unset_dtr_w;
+ /* Step 2.a - Do the write */
+ retval = mem_ap_write_buf_noincr(armv8->debug_ap,
+ tmp_buff, 4, total_u32, armv8->debug_base + CPUDBG_DTRRX);
+ if (retval != ERROR_OK)
+ goto error_unset_dtr_w;
- i += 4;
- }
+ /* Step 3.a - Switch DTR mode back to Normal mode */
+ dscr = (dscr & ~DSCR_MA);
+ retval = mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
+ if (retval != ERROR_OK)
+ goto error_unset_dtr_w;
/* Check for sticky abort flags in the DSCR */
retval = mem_ap_read_atomic_u32(armv8->debug_ap,
armv8->debug_base + CPUDBG_DSCR, &dscr);
if (retval != ERROR_OK)
goto error_free_buff_w;
- if (dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE)) {
+ if (dscr & (DSCR_ERR | DSCR_SYS_ERROR_PEND)) {
/* Abort occurred - clear it and exit */
LOG_ERROR("abort occurred - dscr = 0x%08" PRIx32, dscr);
mem_ap_write_atomic_u32(armv8->debug_ap,
/* Unset DTR mode */
mem_ap_read_atomic_u32(armv8->debug_ap,
armv8->debug_base + CPUDBG_DSCR, &dscr);
- dscr = (dscr & ~DSCR_EXT_DCC_MASK) | DSCR_EXT_DCC_NON_BLOCKING;
+ dscr = (dscr & ~DSCR_MA);
mem_ap_write_atomic_u32(armv8->debug_ap,
armv8->debug_base + CPUDBG_DSCR, dscr);
error_free_buff_w:
return ERROR_FAIL;
}
-static int aarch64_read_apb_ab_memory(struct target *target,
+static int aarch64_read_apb_ap_memory(struct target *target,
target_addr_t address, uint32_t size,
uint32_t count, uint8_t *buffer)
{
/* read memory through APB-AP */
-
int retval = ERROR_COMMAND_SYNTAX_ERROR;
struct armv8_common *armv8 = target_to_armv8(target);
struct arm *arm = &armv8->arm;
+ int total_bytes = count * size;
+ int total_u32;
+ int start_byte = address & 0x3;
+ int end_byte = (address + total_bytes) & 0x3;
struct reg *reg;
- uint32_t dscr, val;
+ uint32_t dscr;
uint8_t *tmp_buff = NULL;
- uint32_t i = 0;
+ uint8_t *u8buf_ptr;
+ uint32_t value;
LOG_DEBUG("Reading APB-AP memory address 0x%" TARGET_PRIxADDR " size %" PRIu32 " count%" PRIu32,
address, size, count);
return ERROR_TARGET_NOT_HALTED;
}
- /* Mark register R0 as dirty, as it will be used
+ total_u32 = DIV_ROUND_UP((address & 3) + total_bytes, 4);
+ /* Mark register X0, X1 as dirty, as it will be used
* for transferring the data.
* It will be restored automatically when exiting
* debug mode
*/
+ reg = armv8_reg_current(arm, 1);
+ reg->dirty = true;
+
reg = armv8_reg_current(arm, 0);
reg->dirty = true;
- /* clear any abort */
+ /* clear any abort */
retval = mem_ap_write_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DRCR, 1<<2);
+ armv8->debug_base + CPUDBG_DRCR, DRCR_CSE);
if (retval != ERROR_OK)
goto error_free_buff_r;
+ /* Read DSCR */
retval = mem_ap_read_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DSCR, &dscr);
+ armv8->debug_base + CPUDBG_DSCR, &dscr);
+
+ /* This algorithm comes from DDI0487A.g, chapter J9.1 */
+
+ /* Set Normal access mode */
+ dscr = (dscr & ~DSCR_MA);
+ retval += mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
+
+ if (arm->core_state == ARM_STATE_AARCH64) {
+ /* Write X0 with value 'address' using write procedure */
+ /* Step 1.a+b - Write the address for read access into DBGDTR_EL0 */
+ retval += aarch64_write_dcc_64(armv8, address & ~0x3ULL);
+ /* Step 1.c - Copy value from DTR to R0 using instruction mrs DBGDTR_EL0, x0 */
+ retval += aarch64_exec_opcode(target, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr);
+ /* Step 1.d - Dummy operation to ensure EDSCR.Txfull == 1 */
+ retval += aarch64_exec_opcode(target, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr);
+ /* Step 1.e - Change DCC to memory mode */
+ dscr = dscr | DSCR_MA;
+ retval += mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
+ /* Step 1.f - read DBGDTRTX and discard the value */
+ retval += mem_ap_read_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DTRTX, &value);
+ } else {
+ /* Write R0 with value 'address' using write procedure */
+ /* Step 1.a+b - Write the address for read access into DBGDTRRXint */
+ retval += aarch64_write_dcc(armv8, address & ~0x3ULL);
+ /* Step 1.c - Copy value from DTR to R0 using instruction mrc DBGDTRTXint, r0 */
+ retval += aarch64_exec_opcode(target,
+ T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), &dscr);
+ /* Step 1.d - Dummy operation to ensure EDSCR.Txfull == 1 */
+ retval += aarch64_exec_opcode(target,
+ T32_FMTITR(ARMV4_5_MCR(14, 0, 0, 0, 5, 0)), &dscr);
+ /* Step 1.e - Change DCC to memory mode */
+ dscr = dscr | DSCR_MA;
+ retval += mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
+ /* Step 1.f - read DBGDTRTX and discard the value */
+ retval += mem_ap_read_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DTRTX, &value);
+
+ }
if (retval != ERROR_OK)
goto error_unset_dtr_r;
- if (size > 4) {
- LOG_WARNING("reading size >4 bytes not yet supported");
- goto error_unset_dtr_r;
- }
+ /* Optimize the read as much as we can, either way we read in a single pass */
+ if ((start_byte) || (end_byte)) {
+ /* The algorithm only copies 32 bit words, so the buffer
+ * should be expanded to include the words at either end.
+ * The first and last words will be read into a temp buffer
+ * to avoid corruption
+ */
+ tmp_buff = malloc(total_u32 * 4);
+ if (!tmp_buff)
+ goto error_unset_dtr_r;
- while (i < count * size) {
+ /* use the tmp buffer to read the entire data */
+ u8buf_ptr = tmp_buff;
+ } else
+ /* address and read length are aligned so read directly into the passed buffer */
+ u8buf_ptr = buffer;
- retval = aarch64_instr_write_data_dcc_64(arm->dpm, 0xd5330400, address+4);
- if (retval != ERROR_OK)
- goto error_unset_dtr_r;
- retval = mem_ap_read_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DSCR, &dscr);
+ /* Read the data - Each read of the DTRTX register causes the instruction to be reissued
+ * Abort flags are sticky, so can be read at end of transactions
+ *
+ * This data is read in aligned to 32 bit boundary.
+ */
- dscr = DSCR_INSTR_COMP;
- retval = aarch64_exec_opcode(target, 0xb85fc000, &dscr);
- if (retval != ERROR_OK)
+ /* Step 2.a - Loop n-1 times, each read of DBGDTRTX reads the data from [X0] and
+ * increments X0 by 4. */
+ retval = mem_ap_read_buf_noincr(armv8->debug_ap, u8buf_ptr, 4, total_u32-1,
+ armv8->debug_base + CPUDBG_DTRTX);
+ if (retval != ERROR_OK)
goto error_unset_dtr_r;
- retval = mem_ap_read_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DSCR, &dscr);
- retval = aarch64_instr_read_data_dcc(arm->dpm, 0xd5130400, &val);
- if (retval != ERROR_OK)
- goto error_unset_dtr_r;
- memcpy(&buffer[i], &val, size);
- i += 4;
- address += 4;
+ /* Step 3.a - set DTR access mode back to Normal mode */
+ dscr = (dscr & ~DSCR_MA);
+ retval = mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
+ if (retval != ERROR_OK)
+ goto error_free_buff_r;
+
+ /* Step 3.b - read DBGDTRTX for the final value */
+ retval = mem_ap_read_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DTRTX, &value);
+ memcpy(u8buf_ptr + (total_u32-1) * 4, &value, 4);
+
+ /* Check for sticky abort flags in the DSCR */
+ retval = mem_ap_read_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ goto error_free_buff_r;
+ if (dscr & (DSCR_ERR | DSCR_SYS_ERROR_PEND)) {
+ /* Abort occurred - clear it and exit */
+ LOG_ERROR("abort occurred - dscr = 0x%08" PRIx32, dscr);
+ mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DRCR, DRCR_CSE);
+ goto error_free_buff_r;
}
- /* Clear any sticky error */
- mem_ap_write_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DRCR, 1<<2);
+ /* check if we need to copy aligned data by applying any shift necessary */
+ if (tmp_buff) {
+ memcpy(buffer, tmp_buff + start_byte, total_bytes);
+ free(tmp_buff);
+ }
/* Done */
return ERROR_OK;
error_unset_dtr_r:
- LOG_WARNING("DSCR = 0x%" PRIx32, dscr);
- /* Todo: Unset DTR mode */
-
+ /* Unset DTR mode */
+ mem_ap_read_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, &dscr);
+ dscr = (dscr & ~DSCR_MA);
+ mem_ap_write_atomic_u32(armv8->debug_ap,
+ armv8->debug_base + CPUDBG_DSCR, dscr);
error_free_buff_r:
LOG_ERROR("error");
free(tmp_buff);
-
- /* Clear any sticky error */
- mem_ap_write_atomic_u32(armv8->debug_ap,
- armv8->debug_base + CPUDBG_DRCR, 1<<2);
-
return ERROR_FAIL;
}
retval = aarch64_mmu_modify(target, 0);
if (retval != ERROR_OK)
return retval;
- retval = aarch64_read_apb_ab_memory(target, address, size, count, buffer);
+ retval = aarch64_read_apb_ap_memory(target, address, size, count, buffer);
}
}
return retval;
if (retval != ERROR_OK)
return retval;
}
- retval = aarch64_read_apb_ab_memory(target, address, size,
+ retval = aarch64_read_apb_ap_memory(target, address, size,
count, buffer);
}
return retval;
if (retval != ERROR_OK)
return retval;
}
- return aarch64_write_apb_ab_memory(target, address, size, count, buffer);
+ return aarch64_write_apb_ap_memory(target, address, size, count, buffer);
}
}
if (retval != ERROR_OK)
return retval;
}
- retval = aarch64_write_apb_ab_memory(target, address, size, count, buffer);
+ retval = aarch64_write_apb_ap_memory(target, address, size, count, buffer);
}
return retval;
}
projects / openocd / commitdiff