Add support for gdb's memory searching capabilities to our in-kernel gdb

server.

Submitted by:	Daniel O'Connor <daniel.oconnor@isilon.com>
Reviewed by:	jhb
Sponsored by:	EMC Isilon Storage Division

1 files changed, 44 insertions, 0 deletions

diff --git a/sys/gdb/gdb_packet.c b/sys/gdb/gdb_packet.c
index a62cc8d16b36..73ee74f34bd0 100644
--- a/sys/gdb/gdb_packet.c
+++ b/sys/gdb/gdb_packet.c
@@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/systm.h>
 #include <sys/ctype.h>
 #include <sys/kdb.h>
+#include <sys/libkern.h>
 #include <sys/ttydefaults.h>
 
 #include <machine/gdb_machdep.h>
@@ -320,3 +321,46 @@ gdb_tx_reg(int regnum)
 	} else
 		gdb_tx_mem(regp, regsz);
 }
+
+/* Read binary data up until the end of the packet or until we have datalen decoded bytes */
+int
+gdb_rx_bindata(unsigned char *data, size_t datalen, size_t *amt)
+{
+	int c;
+
+	*amt = 0;
+
+	while (*amt < datalen) {
+		c = gdb_rx_char();
+		/* End of packet? */
+		if (c == -1)
+			break;
+		/* Escaped character up next */
+		if (c == '}') {
+			/* Truncated packet? Bail out */
+			if ((c = gdb_rx_char()) == -1)
+				return (1);
+			c ^= 0x20;
+		}
+		*(data++) = c & 0xff;
+		(*amt)++;
+	}
+
+	return (0);
+}
+
+int
+gdb_search_mem(const unsigned char *addr, size_t size, const unsigned char *pat, size_t patlen, const unsigned char **found)
+{
+	void *prev;
+	jmp_buf jb;
+	int ret;
+
+	prev = kdb_jmpbuf(jb);
+	ret = setjmp(jb);
+	if (ret == 0)
+		*found = memmem(addr, size, pat, patlen);
+
+	(void)kdb_jmpbuf(prev);
+	return ((ret == 0) ? 1 : 0);
+}