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2010-03-23 Michael Snyder <msnyder@vmware.com> 

* server.c (crc32): New function.
	(handle_query): Add handling for 'qCRC:' request.
This commit is contained in:
Michael Snyder 2010-03-23 22:43:50 +00:00
parent 1814801734
commit 30ba68cb7e
2 changed files with 73 additions and 0 deletions
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5
gdb/gdbserver/ChangeLog
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@ -1,3 +1,8 @@
2010-03-23 Michael Snyder <msnyder@vmware.com>
* server.c (crc32): New function.
(handle_query): Add handling for 'qCRC:' request.
2010-03-23 Pedro Alves <pedro@codesourcery.com>
* linux-x86-low.c (x86_linux_prepare_to_resume): Clear DR6 if the

68
gdb/gdbserver/server.c
View File

@ -788,6 +788,47 @@ handle_threads_qxfer (const char *annex,
}
/* Table used by the crc32 function to calcuate the checksum. */
static unsigned int crc32_table[256] =
{0, 0};
/* Compute 32 bit CRC from inferior memory.
On success, return 32 bit CRC.
On failure, return (unsigned long long) -1. */
static unsigned long long
crc32 (CORE_ADDR base, int len, unsigned int crc)
{
if (!crc32_table[1])
{
/* Initialize the CRC table and the decoding table. */
int i, j;
unsigned int c;
for (i = 0; i < 256; i++)
{
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
crc32_table[i] = c;
}
}
while (len--)
{
unsigned char byte = 0;
/* Return failure if memory read fails. */
if (read_inferior_memory (base, &byte, 1) != 0)
return (unsigned long long) -1;
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ byte) & 255];
base++;
}
return (unsigned long long) crc;
}
/* Handle all of the extended 'q' packets. */
void
handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
@ -1421,6 +1462,33 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
return;
}
if (strncmp ("qCRC:", own_buf, 5) == 0)
{
/* CRC check (compare-section). */
char *comma;
CORE_ADDR base;
int len;
unsigned long long crc;
require_running (own_buf);
base == strtoul (own_buf + 5, &comma, 16);
if (*comma++ != ',')
{
write_enn (own_buf);
return;
}
len = strtoul (comma, NULL, 16);
crc = crc32 (base, len, 0xffffffff);
/* Check for memory failure. */
if (crc == (unsigned long long) -1)
{
write_enn (own_buf);
return;
}
sprintf (own_buf, "C%lx", (unsigned long) crc);
return;
}
/* Otherwise we didn't know what packet it was. Say we didn't
understand it. */
own_buf[0] = 0;