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Add support for halfword memory accesses.

This commit is contained in:
Vegard Storheil Eriksen 2014-10-21 00:12:50 +02:00
parent fd9eef821e
commit 9434299613
4 changed files with 84 additions and 0 deletions
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67
src/adiv5.c
View File

@ -46,6 +46,8 @@ static int ap_check_error(struct target_s *target);
static int ap_mem_read_words(struct target_s *target, uint32_t *dest, uint32_t src, int len);
static int ap_mem_write_words(struct target_s *target, uint32_t dest, const uint32_t *src, int len);
static int ap_mem_read_halfwords(struct target_s *target, uint16_t *dest, uint32_t src, int len);
static int ap_mem_write_halfwords(struct target_s *target, uint32_t dest, const uint16_t *src, int len);
static int ap_mem_read_bytes(struct target_s *target, uint8_t *dest, uint32_t src, int len);
static int ap_mem_write_bytes(struct target_s *target, uint32_t dest, const uint8_t *src, int len);
@ -152,6 +154,8 @@ void adiv5_dp_init(ADIv5_DP_t *dp)
t->mem_read_words = ap_mem_read_words;
t->mem_write_words = ap_mem_write_words;
t->mem_read_halfwords = ap_mem_read_halfwords;
t->mem_write_halfwords = ap_mem_write_halfwords;
t->mem_read_bytes = ap_mem_read_bytes;
t->mem_write_bytes = ap_mem_write_bytes;
@ -219,6 +223,42 @@ ap_mem_read_words(struct target_s *target, uint32_t *dest, uint32_t src, int len
return 0;
}
static int
ap_mem_read_halfwords(struct target_s *target, uint16_t *dest, uint32_t src, int len)
{
ADIv5_AP_t *ap = adiv5_target_ap(target);
uint32_t tmp;
uint32_t osrc = src;
len >>= 1;
adiv5_ap_write(ap, ADIV5_AP_CSW, ap->csw |
ADIV5_AP_CSW_SIZE_HALFWORD | ADIV5_AP_CSW_ADDRINC_SINGLE);
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP, ADIV5_LOW_WRITE,
ADIV5_AP_TAR, src);
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP, ADIV5_LOW_READ,
ADIV5_AP_DRW, 0);
while(--len) {
tmp = adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP, ADIV5_LOW_READ,
ADIV5_AP_DRW, 0);
*dest++ = (tmp >> ((src & 0x2) << 3) & 0xFFFF);
src += 2;
/* Check for 10 bit address overflow */
if ((src ^ osrc) & 0xfffffc00) {
osrc = src;
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP,
ADIV5_LOW_WRITE, ADIV5_AP_TAR, src);
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP,
ADIV5_LOW_READ, ADIV5_AP_DRW, 0);
}
}
tmp = adiv5_dp_low_access(ap->dp, 0, 1, ADIV5_DP_RDBUFF, 0);
*dest++ = (tmp >> ((src & 0x2) << 3) & 0xFFFF);
return 0;
}
static int
ap_mem_read_bytes(struct target_s *target, uint8_t *dest, uint32_t src, int len)
{
@ -280,6 +320,33 @@ ap_mem_write_words(struct target_s *target, uint32_t dest, const uint32_t *src,
return 0;
}
static int
ap_mem_write_halfwords(struct target_s *target, uint32_t dest, const uint16_t *src, int len)
{
ADIv5_AP_t *ap = adiv5_target_ap(target);
uint32_t odest = dest;
len >>= 1;
adiv5_ap_write(ap, ADIV5_AP_CSW, ap->csw |
ADIV5_AP_CSW_SIZE_HALFWORD | ADIV5_AP_CSW_ADDRINC_SINGLE);
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP, ADIV5_LOW_WRITE,
ADIV5_AP_TAR, dest);
while(len--) {
uint32_t tmp = (uint32_t)*src++ << ((dest & 2) << 3);
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP, ADIV5_LOW_WRITE,
ADIV5_AP_DRW, tmp);
dest += 2;
/* Check for 10 bit address overflow */
if ((dest ^ odest) & 0xfffffc00) {
odest = dest;
adiv5_dp_low_access(ap->dp, ADIV5_LOW_AP,
ADIV5_LOW_WRITE, ADIV5_AP_TAR, dest);
}
}
return 0;
}
static int
ap_mem_write_bytes(struct target_s *target, uint32_t dest, const uint8_t *src, int len)
{

2
src/arm7tdmi.c
View File

@ -129,6 +129,8 @@ void arm7tdmi_jtag_handler(jtag_dev_t *dev)
t->check_error = (void *)do_nothing;
t->mem_read_words = (void *)do_nothing;
t->mem_write_words = (void *)do_nothing;
t->mem_read_halfwords = (void *)do_nothing;
t->mem_write_halfwords = (void *)do_nothing;
t->mem_read_bytes = (void *)do_nothing;
t->mem_write_bytes = (void *)do_nothing;
t->regs_size = 16 * sizeof(uint32_t);

4
src/gdb_main.c
View File

@ -101,6 +101,8 @@ gdb_main(void)
uint8_t mem[len];
if(((addr & 3) == 0) && ((len & 3) == 0))
target_mem_read_words(cur_target, (void*)mem, addr, len);
else if(((addr & 1) == 0) && ((len & 1) == 0))
target_mem_read_halfwords(cur_target, (void*)mem, addr, len);
else
target_mem_read_bytes(cur_target, (void*)mem, addr, len);
if(target_check_error(cur_target))
@ -127,6 +129,8 @@ gdb_main(void)
unhexify(mem, pbuf + hex, len);
if(((addr & 3) == 0) && ((len & 3) == 0))
target_mem_write_words(cur_target, addr, (void*)mem, len);
else if(((addr & 1) == 0) && ((len & 1) == 0))
target_mem_write_halfwords(cur_target, addr, (void*)mem, len);
else
target_mem_write_bytes(cur_target, addr, (void*)mem, len);
if(target_check_error(cur_target))

11
src/include/target.h
View File

@ -56,6 +56,12 @@ target *target_attach(target *t, target_destroy_callback destroy_cb);
#define target_mem_write_words(target, dest, src, len) \
(target)->mem_write_words((target), (dest), (src), (len))
#define target_mem_read_halfwords(target, dest, src, len) \
(target)->mem_read_halfwords((target), (dest), (src), (len))
#define target_mem_write_halfwords(target, dest, src, len) \
(target)->mem_write_halfwords((target), (dest), (src), (len))
#define target_mem_read_bytes(target, dest, src, len) \
(target)->mem_read_bytes((target), (dest), (src), (len))
@ -136,6 +142,11 @@ struct target_s {
int (*mem_write_words)(struct target_s *target, uint32_t dest,
const uint32_t *src, int len);
int (*mem_read_halfwords)(struct target_s *target, uint16_t *dest, uint32_t src,
int len);
int (*mem_write_halfwords)(struct target_s *target, uint32_t dest,
const uint16_t *src, int len);
int (*mem_read_bytes)(struct target_s *target, uint8_t *dest, uint32_t src,
int len);
int (*mem_write_bytes)(struct target_s *target, uint32_t dest,