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kgdb: update mem2hex/hex2mem funcs

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Convert the funcs to do the conversion inline so that we can do the copy
all at once with memcpy.  This let's us push out an weird arch-specific
issue with accessing different regions of memory to the memcpy function
like the MMRs on Blackfin systems, and it should be a bit faster.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Robin Getz 2009-12-21 18:40:44 -05:00 • committed by Wolfgang Denk
parent cbb0cab1d9
commit 16035bcd8c
1 changed files with 32 additions and 11 deletions
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43
common/kgdb.c
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@ -132,11 +132,20 @@ hex(unsigned char ch)
static unsigned char * static unsigned char *
mem2hex(char *mem, char *buf, int count) mem2hex(char *mem, char *buf, int count)
{ {
char *tmp;
unsigned char ch; unsigned char ch;
/*
* We use the upper half of buf as an intermediate buffer for the
* raw memory copy. Hex conversion will work against this one.
*/
tmp = buf + count;
longjmp_on_fault = 1; longjmp_on_fault = 1;
memcpy(tmp, mem, count);
while (count-- > 0) { while (count-- > 0) {
ch = *mem++; ch = *tmp++;
*buf++ = hexchars[ch >> 4]; *buf++ = hexchars[ch >> 4];
*buf++ = hexchars[ch & 0xf]; *buf++ = hexchars[ch & 0xf];
} }
@ -151,21 +160,33 @@ mem2hex(char *mem, char *buf, int count)
static char * static char *
hex2mem(char *buf, char *mem, int count) hex2mem(char *buf, char *mem, int count)
{ {
int i, hexValue; int hexValue;
unsigned char ch; char *tmp_raw, *tmp_hex;
char *mem_start = mem;
/*
* We use the upper half of buf as an intermediate buffer for the
* raw memory that is converted from hex.
*/
tmp_raw = buf + count * 2;
tmp_hex = tmp_raw - 1;
longjmp_on_fault = 1; longjmp_on_fault = 1;
for (i=0; i<count; i++) { while (tmp_hex >= buf) {
if ((hexValue = hex(*buf++)) < 0) tmp_raw--;
hexValue = hex(*tmp_hex--);
if (hexValue < 0)
kgdb_error(KGDBERR_NOTHEXDIG); kgdb_error(KGDBERR_NOTHEXDIG);
ch = hexValue << 4; *tmp_raw = hexValue;
if ((hexValue = hex(*buf++)) < 0) hexValue = hex(*tmp_hex--);
if (hexValue < 0)
kgdb_error(KGDBERR_NOTHEXDIG); kgdb_error(KGDBERR_NOTHEXDIG);
ch |= hexValue; *tmp_raw |= hexValue << 4;
*mem++ = ch;
} }
kgdb_flush_cache_range((void *)mem_start, (void *)(mem - 1));
memcpy(mem, tmp_raw, count);
kgdb_flush_cache_range((void *)mem, (void *)(mem+count));
longjmp_on_fault = 0; longjmp_on_fault = 0;
return buf; return buf;