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riscv-openocd
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- added faster gdb packet handling (thanks to oyvind harboe for the patch) 

- code reformat

git-svn-id: svn://svn.berlios.de/openocd/trunk@251 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
ntfreak 2008-01-10 19:29:52 +00:00
parent 64aac5f7e1
commit 5eedf3e1ce
2 changed files with 78 additions and 14 deletions
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80
src/server/gdb_server.c
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@ -38,7 +38,7 @@
#include <unistd.h>
#include <stdlib.h>
#if 0
#if 1
#define _DEBUG_GDB_IO_
#endif
@ -185,7 +185,9 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len)
int i;
unsigned char my_checksum = 0;
char checksum[3];
#ifdef _DEBUG_GDB_IO_
char *debug_buffer;
#endif
int reply;
int retval;
gdb_connection_t *gdb_con = connection->priv;
@ -195,12 +197,13 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len)
while (1)
{
#ifdef _DEBUG_GDB_IO_
debug_buffer = malloc(len + 1);
memcpy(debug_buffer, buffer, len);
debug_buffer[len] = 0;
DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
free(debug_buffer);
#endif
write_socket(connection->fd, "$", 1);
if (len > 0)
write_socket(connection->fd, buffer, len);
@ -284,8 +287,62 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len)
my_checksum = 0;
do
for (;;)
{
/* The common case is that we have an entire packet with no escape chars.
* We need to leave at least 2 bytes in the buffer to have
* gdb_get_char() update various bits and bobs correctly.
*/
if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt+count) < *len))
{
/* The compiler will struggle a bit with constant propagation and
* aliasing, so we help it by showing that these values do not
* change inside the loop
*/
int i;
char *buf = gdb_con->buf_p;
int run = gdb_con->buf_cnt - 2;
i = 0;
int done = 0;
while (i < run)
{
character = *buf++;
i++;
if (character == '#')
{
/* Danger! character can be '#' when esc is
* used so we need an explicit boolean for done here.
*/
done = 1;
break;
}
if (character == '}')
{
/* data transmitted in binary mode (X packet)
* uses 0x7d as escape character */
my_checksum += character & 0xff;
character = *buf++;
i++;
my_checksum += character & 0xff;
buffer[count++] = (character ^ 0x20) & 0xff;
} else
{
my_checksum += character & 0xff;
buffer[count++] = character & 0xff;
}
}
gdb_con->buf_p += i;
gdb_con->buf_cnt -= i;
if (done)
break;
}
if (count > *len)
{
ERROR("packet buffer too small");
return ERROR_GDB_BUFFER_TOO_SMALL;
}
if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
return retval;
@ -308,12 +365,7 @@ int gdb_get_packet(connection_t *connection, char *buffer, int *len)
buffer[count++] = character & 0xff;
}
if (count > *len)
{
ERROR("packet buffer too small");
return ERROR_GDB_BUFFER_TOO_SMALL;
}
} while (1);
*len = count;
@ -910,6 +962,18 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac
retval = target->type->read_memory(target, addr, 1, len, buffer);
}
#if 0
if (retval == ERROR_TARGET_DATA_ABORT)
{
/* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
* At some point this might be fixed in GDB, in which case this code can be removed.
* http://sourceware.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=2395
*/
memset(buffer, 0, len);
retval = ERROR_OK;
}
#endif
if (retval == ERROR_OK)
{
hex_buffer = malloc(len * 2 + 1);