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armv4_5: add algorithms instruction breakpoint support 

Update the arm_checksum_memory and arm_blank_check_memory
algorithms to use a breakpoint instruction on v5 arch.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>
__archive__
Spencer Oliver 2010-07-20 09:02:10 +01:00
parent 1143bbc0c8
commit f0c0256b1f
1 changed files with 16 additions and 6 deletions
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22
src/target/armv4_5.c
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@ -1286,16 +1286,17 @@ int armv4_5_run_algorithm(struct target *target, int num_mem_params, struct mem_
/**
* Runs ARM code in the target to calculate a CRC32 checksum.
*
* \todo On ARMv5+, rely on BKPT termination for reduced overhead.
*/
int arm_checksum_memory(struct target *target,
uint32_t address, uint32_t count, uint32_t *checksum)
{
struct working_area *crc_algorithm;
struct arm_algorithm armv4_5_info;
struct arm *armv4_5 = target_to_arm(target);
struct reg_param reg_params[2];
int retval;
uint32_t i;
uint32_t exit_var = 0;
static const uint32_t arm_crc_code[] = {
0xE1A02000, /* mov r2, r0 */
@ -1321,7 +1322,7 @@ int arm_checksum_memory(struct target *target,
0xE1540003, /* cmp r4, r3 */
0x1AFFFFF1, /* bne nbyte */
/* end: */
0xEAFFFFFE, /* b end */
0xe1200070, /* bkpt #0 */
/* CRC32XOR: */
0x04C11DB7 /* .word 0x04C11DB7 */
};
@ -1353,9 +1354,13 @@ int arm_checksum_memory(struct target *target,
/* 20 second timeout/megabyte */
int timeout = 20000 * (1 + (count / (1024 * 1024)));
/* armv4 must exit using a hardware breakpoint */
if (armv4_5->is_armv4)
exit_var = crc_algorithm->address + sizeof(arm_crc_code) - 8;
retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
crc_algorithm->address,
crc_algorithm->address + sizeof(arm_crc_code) - 8,
exit_var,
timeout, &armv4_5_info);
if (retval != ERROR_OK) {
LOG_ERROR("error executing ARM crc algorithm");
@ -1380,7 +1385,6 @@ int arm_checksum_memory(struct target *target,
* all ones. NOR flash which has been erased, and thus may be written,
* holds all ones.
*
* \todo On ARMv5+, rely on BKPT termination for reduced overhead.
*/
int arm_blank_check_memory(struct target *target,
uint32_t address, uint32_t count, uint32_t *blank)
@ -1388,8 +1392,10 @@ int arm_blank_check_memory(struct target *target,
struct working_area *check_algorithm;
struct reg_param reg_params[3];
struct arm_algorithm armv4_5_info;
struct arm *armv4_5 = target_to_arm(target);
int retval;
uint32_t i;
uint32_t exit_var = 0;
static const uint32_t check_code[] = {
/* loop: */
@ -1398,7 +1404,7 @@ int arm_blank_check_memory(struct target *target,
0xe2511001, /* subs r1, r1, #1 */
0x1afffffb, /* bne loop */
/* end: */
0xeafffffe /* b end */
0xe1200070, /* bkpt #0 */
};
/* make sure we have a working area */
@ -1430,9 +1436,13 @@ int arm_blank_check_memory(struct target *target,
init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
buf_set_u32(reg_params[2].value, 0, 32, 0xff);
/* armv4 must exit using a hardware breakpoint */
if (armv4_5->is_armv4)
exit_var = check_algorithm->address + sizeof(check_code) - 4;
retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
check_algorithm->address,
check_algorithm->address + sizeof(check_code) - 4,
exit_var,
10000, &armv4_5_info);
if (retval != ERROR_OK) {
destroy_reg_param(&reg_params[0]);