Constify unpack_varlen_hex & fix fallout

I ran into non-const unpack_varlen_hex while working on something
else, and decided to just fix it first.  Ends up constifying a good
deal of remote packet parsing.

gdb/ChangeLog:
2017-09-29  Pedro Alves  <palves@redhat.com>

	* common/rsp-low.c (unpack_varlen_hex): Constify.
	* common/rsp-low.h (unpack_varlen_hex): Constify.
	* linux-nat.c (linux_child_static_tracepoint_markers_by_strid):
	Constify.
	* remote.c (remote_set_permissions, read_ptid)
	(remote_current_thread, remote_get_threads_with_qthreadinfo)
	(remote_static_tracepoint_marker_at)
	(remote_static_tracepoint_markers_by_strid)
	(stop_reply_extract_thread, remote_parse_stop_reply): Constify.
	* tracepoint.c (parse_trace_status, parse_tracepoint_status)
	(parse_tracepoint_definition, parse_tsv_definition)
	(parse_static_tracepoint_marker_definition): Constify.
	* tracepoint.h (parse_static_tracepoint_marker_definition)
	(parse_trace_status, parse_tracepoint_status)
	(parse_tracepoint_definition, parse_tsv_definition): Constify.

gdb/gdbserver/ChangeLog:
2017-09-29  Pedro Alves  <palves@redhat.com>

	* ax.c (gdb_parse_agent_expr): Constify.
	* ax.h (gdb_parse_agent_expr): Constify.
	* mem-break.c (add_breakpoint_condition, add_breakpoint_commands):
	Constify.
	* mem-break.h (add_breakpoint_condition, add_breakpoint_commands): Constify.
	* remote-utils.c (hex_or_minus_one, read_ptid): Constify.
	* remote-utils.h (read_ptid): Constify.
	* server.c (handle_qxfer_exec_file, handle_query, handle_v_cont)
	(process_point_options, process_serial_event): Constify.
	* tracepoint.c (add_tracepoint_action, cmd_qtdp, cmd_qtdpsrc)
	(cmd_qtdv, cmd_qtenable_disable, cmd_qtro, cmd_qtframe, cmd_qtp)
	(cmd_qtbuffer): Constify.

16 files changed, 115 insertions, 82 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index dd4fb69..aaa0f14 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,23 @@
 2017-09-29  Pedro Alves  <palves@redhat.com>
 
+	* common/rsp-low.c (unpack_varlen_hex): Constify.
+	* common/rsp-low.h (unpack_varlen_hex): Constify.
+	* linux-nat.c (linux_child_static_tracepoint_markers_by_strid):
+	Constify.
+	* remote.c (remote_set_permissions, read_ptid)
+	(remote_current_thread, remote_get_threads_with_qthreadinfo)
+	(remote_static_tracepoint_marker_at)
+	(remote_static_tracepoint_markers_by_strid)
+	(stop_reply_extract_thread, remote_parse_stop_reply): Constify.
+	* tracepoint.c (parse_trace_status, parse_tracepoint_status)
+	(parse_tracepoint_definition, parse_tsv_definition)
+	(parse_static_tracepoint_marker_definition): Constify.
+	* tracepoint.h (parse_static_tracepoint_marker_definition)
+	(parse_trace_status, parse_tracepoint_status)
+	(parse_tracepoint_definition, parse_tsv_definition): Constify.
+
+2017-09-29  Pedro Alves  <palves@redhat.com>
+
 	* remote.c (target_buf, target_buf_size): Delete.
 	(remote_get_noisy_reply): Remove buf_p and sizeof_buf parameters.
 	Use the connection's packet buffer instead.
diff --git a/gdb/common/rsp-low.c b/gdb/common/rsp-low.c
index 4befeb1..85987f7 100644
--- a/gdb/common/rsp-low.c
+++ b/gdb/common/rsp-low.c
@@ -92,8 +92,8 @@ pack_hex_byte (char *pkt, int byte)
 
 /* See rsp-low.h.  */
 
-char *
-unpack_varlen_hex (char *buff,	/* packet to parse */
+const char *
+unpack_varlen_hex (const char *buff,	/* packet to parse */
 		   ULONGEST *result)
 {
   int nibble;
diff --git a/gdb/common/rsp-low.h b/gdb/common/rsp-low.h
index 2b3685f..99dc93f 100644
--- a/gdb/common/rsp-low.h
+++ b/gdb/common/rsp-low.h
@@ -41,7 +41,7 @@ extern char *pack_hex_byte (char *pkt, int byte);
    in RESULT.  Reads until a non-hex digit is seen.  Returns a pointer
    to the terminating character.  */
 
-extern char *unpack_varlen_hex (char *buff, ULONGEST *result);
+extern const char *unpack_varlen_hex (const char *buff, ULONGEST *result);
 
 /* HEX is a string of characters representing hexadecimal digits.
    Convert pairs of hex digits to bytes and store sequentially into
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 0dbcae2..6027c7f 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,5 +1,20 @@
 2017-09-29  Pedro Alves  <palves@redhat.com>
 
+	* ax.c (gdb_parse_agent_expr): Constify.
+	* ax.h (gdb_parse_agent_expr): Constify.
+	* mem-break.c (add_breakpoint_condition, add_breakpoint_commands):
+	Constify.
+	* mem-break.h (add_breakpoint_condition, add_breakpoint_commands): Constify.
+	* remote-utils.c (hex_or_minus_one, read_ptid): Constify.
+	* remote-utils.h (read_ptid): Constify.
+	* server.c (handle_qxfer_exec_file, handle_query, handle_v_cont)
+	(process_point_options, process_serial_event): Constify.
+	* tracepoint.c (add_tracepoint_action, cmd_qtdp, cmd_qtdpsrc)
+	(cmd_qtdv, cmd_qtenable_disable, cmd_qtro, cmd_qtframe, cmd_qtp)
+	(cmd_qtbuffer): Constify.
+
+2017-09-29  Pedro Alves  <palves@redhat.com>
+
 	* proc-service.c (ps_pdread): Return PS_ERR if reading memory
 	fails.
 
diff --git a/gdb/gdbserver/ax.c b/gdb/gdbserver/ax.c
index 87b9359..35ed2c6 100644
--- a/gdb/gdbserver/ax.c
+++ b/gdb/gdbserver/ax.c
@@ -95,9 +95,9 @@ gdb_agent_op_name (int op)
    of bytes in expression, a comma, and then the bytes.  */
 
 struct agent_expr *
-gdb_parse_agent_expr (char **actparm)
+gdb_parse_agent_expr (const char **actparm)
 {
-  char *act = *actparm;
+  const char *act = *actparm;
   ULONGEST xlen;
   struct agent_expr *aexpr;
 
diff --git a/gdb/gdbserver/ax.h b/gdb/gdbserver/ax.h
index b400cb9..6f4612b 100644
--- a/gdb/gdbserver/ax.h
+++ b/gdb/gdbserver/ax.h
@@ -55,7 +55,7 @@ struct agent_expr
 
 /* The packet form of an agent expression consists of an 'X', number
    of bytes in expression, a comma, and then the bytes.  */
-struct agent_expr *gdb_parse_agent_expr (char **actparm);
+struct agent_expr *gdb_parse_agent_expr (const char **actparm);
 
 /* Release an agent expression.  */
 void gdb_free_agent_expr (struct agent_expr *aexpr);
diff --git a/gdb/gdbserver/mem-break.c b/gdb/gdbserver/mem-break.c
index 6e6926a..d836177 100644
--- a/gdb/gdbserver/mem-break.c
+++ b/gdb/gdbserver/mem-break.c
@@ -1269,9 +1269,9 @@ add_condition_to_breakpoint (struct gdb_breakpoint *bp,
 /* Add a target-side condition CONDITION to a breakpoint.  */
 
 int
-add_breakpoint_condition (struct gdb_breakpoint *bp, char **condition)
+add_breakpoint_condition (struct gdb_breakpoint *bp, const char **condition)
 {
-  char *actparm = *condition;
+  const char *actparm = *condition;
   struct agent_expr *cond;
 
   if (condition == NULL)
@@ -1367,10 +1367,10 @@ add_commands_to_breakpoint (struct gdb_breakpoint *bp,
 /* Add a target-side command COMMAND to the breakpoint at ADDR.  */
 
 int
-add_breakpoint_commands (struct gdb_breakpoint *bp, char **command,
+add_breakpoint_commands (struct gdb_breakpoint *bp, const char **command,
 			 int persist)
 {
-  char *actparm = *command;
+  const char *actparm = *command;
   struct agent_expr *cmd;
 
   if (command == NULL)
diff --git a/gdb/gdbserver/mem-break.h b/gdb/gdbserver/mem-break.h
index b14d2be..54f0983 100644
--- a/gdb/gdbserver/mem-break.h
+++ b/gdb/gdbserver/mem-break.h
@@ -114,14 +114,15 @@ void clear_breakpoint_conditions_and_commands (struct gdb_breakpoint *bp);
    Returns false on failure.  On success, advances CONDITION pointer
    past the condition and returns true.  */
 
-int add_breakpoint_condition (struct gdb_breakpoint *bp, char **condition);
+int add_breakpoint_condition (struct gdb_breakpoint *bp,
+			      const char **condition);
 
 /* Set target-side commands COMMANDS to the breakpoint at ADDR.
    Returns false on failure.  On success, advances COMMANDS past the
    commands and returns true.  If PERSIST, the commands should run
    even while GDB is disconnected.  */
 
-int add_breakpoint_commands (struct gdb_breakpoint *bp, char **commands,
+int add_breakpoint_commands (struct gdb_breakpoint *bp, const char **commands,
 			     int persist);
 
 int any_persistent_commands (void);
diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c
index 7616046..66e0652 100644
--- a/gdb/gdbserver/remote-utils.c
+++ b/gdb/gdbserver/remote-utils.c
@@ -533,7 +533,7 @@ write_ptid (char *buf, ptid_t ptid)
 }
 
 static ULONGEST
-hex_or_minus_one (char *buf, char **obuf)
+hex_or_minus_one (const char *buf, const char **obuf)
 {
   ULONGEST ret;
 
@@ -554,10 +554,10 @@ hex_or_minus_one (char *buf, char **obuf)
 /* Extract a PTID from BUF.  If non-null, OBUF is set to the to one
    passed the last parsed char.  Returns null_ptid on error.  */
 ptid_t
-read_ptid (char *buf, char **obuf)
+read_ptid (const char *buf, const char **obuf)
 {
-  char *p = buf;
-  char *pp;
+  const char *p = buf;
+  const char *pp;
   ULONGEST pid = 0, tid = 0;
 
   if (*p == 'p')
diff --git a/gdb/gdbserver/remote-utils.h b/gdb/gdbserver/remote-utils.h
index b3eab3b..b45a725 100644
--- a/gdb/gdbserver/remote-utils.h
+++ b/gdb/gdbserver/remote-utils.h
@@ -28,7 +28,7 @@ int gdb_connected (void);
 #define STDIO_CONNECTION_NAME "stdio"
 int remote_connection_is_stdio (void);
 
-ptid_t read_ptid (char *buf, char **obuf);
+ptid_t read_ptid (const char *buf, const char **obuf);
 char *write_ptid (char *buf, ptid_t ptid);
 
 int putpkt (char *buf);
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index f3eee31..c4f1e8d 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -1427,7 +1427,7 @@ handle_qxfer_auxv (const char *annex,
 /* Handle qXfer:exec-file:read.  */
 
 static int
-handle_qxfer_exec_file (const char *const_annex,
+handle_qxfer_exec_file (const char *annex,
 			gdb_byte *readbuf, const gdb_byte *writebuf,
 			ULONGEST offset, LONGEST len)
 {
@@ -1438,7 +1438,7 @@ handle_qxfer_exec_file (const char *const_annex,
   if (the_target->pid_to_exec_file == NULL || writebuf != NULL)
     return -2;
 
-  if (const_annex[0] == '\0')
+  if (annex[0] == '\0')
     {
       if (current_thread == NULL)
 	return -1;
@@ -1447,11 +1447,7 @@ handle_qxfer_exec_file (const char *const_annex,
     }
   else
     {
-      char *annex = (char *) alloca (strlen (const_annex) + 1);
-
-      strcpy (annex, const_annex);
       annex = unpack_varlen_hex (annex, &pid);
-
       if (annex[0] != '\0')
 	return -1;
     }
@@ -2535,7 +2531,7 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
   if (the_target->get_tib_address != NULL
       && startswith (own_buf, "qGetTIBAddr:"))
     {
-      char *annex;
+      const char *annex;
       int n;
       CORE_ADDR tlb;
       ptid_t ptid = read_ptid (own_buf + 12, &annex);
@@ -2623,7 +2619,7 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
   if (startswith (own_buf, "qCRC:"))
     {
       /* CRC check (compare-section).  */
-      char *comma;
+      const char *comma;
       ULONGEST base;
       int len;
       unsigned long long crc;
@@ -2732,7 +2728,7 @@ handle_pending_status (const struct thread_resume *resumption,
 static void
 handle_v_cont (char *own_buf)
 {
-  char *p, *q;
+  const char *p;
   int n = 0, i = 0;
   struct thread_resume *resume_info;
   struct thread_resume default_action { null_ptid };
@@ -2771,8 +2767,8 @@ handle_v_cont (char *own_buf)
 
       if (p[0] == 'S' || p[0] == 'C')
 	{
-	  int sig;
-	  sig = strtol (p + 1, &q, 16);
+	  char *q;
+	  int sig = strtol (p + 1, &q, 16);
 	  if (p == q)
 	    goto err;
 	  p = q;
@@ -2809,6 +2805,7 @@ handle_v_cont (char *own_buf)
 	}
       else if (p[0] == ':')
 	{
+	  const char *q;
 	  ptid_t ptid = read_ptid (p + 1, &q);
 
 	  if (p == q)
@@ -4009,9 +4006,9 @@ main (int argc, char *argv[])
    after the last processed option.  */
 
 static void
-process_point_options (struct gdb_breakpoint *bp, char **packet)
+process_point_options (struct gdb_breakpoint *bp, const char **packet)
 {
-  char *dataptr = *packet;
+  const char *dataptr = *packet;
   int persist;
 
   /* Check if data has the correct format.  */
@@ -4273,7 +4270,7 @@ process_serial_event (void)
 	char type = own_buf[1];
 	int res;
 	const int insert = ch == 'Z';
-	char *p = &own_buf[3];
+	const char *p = &own_buf[3];
 
 	p = unpack_varlen_hex (p, &addr);
 	kind = strtol (p + 1, &dataptr, 16);
@@ -4293,7 +4290,8 @@ process_serial_event (void)
 		   is telling us to drop that list and use this one
 		   instead.  */
 		clear_breakpoint_conditions_and_commands (bp);
-		process_point_options (bp, &dataptr);
+		const char *options = dataptr;
+		process_point_options (bp, &options);
 	      }
 	  }
 	else
diff --git a/gdb/gdbserver/tracepoint.c b/gdb/gdbserver/tracepoint.c
index 0f41ff4..8ec8010 100644
--- a/gdb/gdbserver/tracepoint.c
+++ b/gdb/gdbserver/tracepoint.c
@@ -1910,9 +1910,9 @@ find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num)
 /* Append another action to perform when the tracepoint triggers.  */
 
 static void
-add_tracepoint_action (struct tracepoint *tpoint, char *packet)
+add_tracepoint_action (struct tracepoint *tpoint, const char *packet)
 {
-  char *act;
+  const char *act;
 
   if (*packet == 'S')
     {
@@ -1924,7 +1924,7 @@ add_tracepoint_action (struct tracepoint *tpoint, char *packet)
 
   while (*act)
     {
-      char *act_start = act;
+      const char *act_start = act;
       struct tracepoint_action *action = NULL;
 
       switch (*act)
@@ -2485,8 +2485,7 @@ cmd_qtdp (char *own_buf)
   ULONGEST addr;
   ULONGEST count;
   struct tracepoint *tpoint;
-  char *actparm;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   packet += strlen ("QTDP:");
 
@@ -2546,9 +2545,7 @@ cmd_qtdp (char *own_buf)
 	    }
 	  else if (*packet == 'X')
 	    {
-	      actparm = (char *) packet;
-	      tpoint->cond = gdb_parse_agent_expr (&actparm);
-	      packet = actparm;
+	      tpoint->cond = gdb_parse_agent_expr (&packet);
 	    }
 	  else if (*packet == '-')
 	    break;
@@ -2657,8 +2654,9 @@ cmd_qtdpsrc (char *own_buf)
 {
   ULONGEST num, addr, start, slen;
   struct tracepoint *tpoint;
-  char *packet = own_buf;
-  char *saved, *srctype, *src;
+  const char *packet = own_buf;
+  const char *saved;
+  char *srctype, *src;
   size_t nbytes;
   struct source_string *last, *newlast;
 
@@ -2720,7 +2718,7 @@ cmd_qtdv (char *own_buf)
   char *varname;
   size_t nbytes;
   struct trace_state_variable *tsv;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   packet += strlen ("QTDV:");
 
@@ -2748,7 +2746,7 @@ cmd_qtdv (char *own_buf)
 static void
 cmd_qtenable_disable (char *own_buf, int enable)
 {
-  char *packet = own_buf;
+  const char *packet = own_buf;
   ULONGEST num, addr;
   struct tracepoint *tp;
 
@@ -2870,7 +2868,7 @@ cmd_qtro (char *own_buf)
 {
   ULONGEST start, end;
   struct readonly_region *roreg;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   trace_debug ("Want to mark readonly regions");
 
@@ -3557,7 +3555,7 @@ cmd_qtframe (char *own_buf)
   ULONGEST frame, pc, lo, hi, num;
   int tfnum, tpnum;
   struct traceframe *tframe;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   packet += strlen ("QTFrame:");
 
@@ -3712,7 +3710,7 @@ cmd_qtp (char *own_buf)
 {
   ULONGEST num, addr;
   struct tracepoint *tpoint;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   packet += strlen ("qTP:");
 
@@ -4005,7 +4003,7 @@ cmd_qtbuffer (char *own_buf)
 {
   ULONGEST offset, num, tot;
   unsigned char *tbp;
-  char *packet = own_buf;
+  const char *packet = own_buf;
 
   packet += strlen ("qTBuffer:");
 
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index cc48d7e..0f340ee 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4291,7 +4291,7 @@ linux_child_static_tracepoint_markers_by_strid (struct target_ops *self,
   int pid = ptid_get_pid (inferior_ptid);
   VEC(static_tracepoint_marker_p) *markers = NULL;
   struct static_tracepoint_marker *marker = NULL;
-  char *p = s;
+  const char *p = s;
   ptid_t ptid = ptid_build (pid, 0, 0);
 
   /* Pause all */
diff --git a/gdb/remote.c b/gdb/remote.c
index a0c6f6c..54d810f 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -185,7 +185,7 @@ static void show_remote_protocol_packet_cmd (struct ui_file *file,
 					     const char *value);
 
 static char *write_ptid (char *buf, const char *endbuf, ptid_t ptid);
-static ptid_t read_ptid (char *buf, char **obuf);
+static ptid_t read_ptid (const char *buf, const char **obuf);
 
 static void remote_set_permissions (struct target_ops *self);
 
@@ -592,7 +592,7 @@ remote_get_noisy_reply ()
 	{
 	  ULONGEST ul;
 	  CORE_ADDR from, to, org_to;
-	  char *p, *pp;
+	  const char *p, *pp;
 	  int adjusted_size = 0;
 	  int relocated = 0;
 
@@ -2445,14 +2445,15 @@ write_ptid (char *buf, const char *endbuf, ptid_t ptid)
   return buf;
 }
 
-/* Extract a PTID from BUF.  If non-null, OBUF is set to the to one
-   passed the last parsed char.  Returns null_ptid on error.  */
+/* Extract a PTID from BUF.  If non-null, OBUF is set to one past the
+   last parsed char.  Returns null_ptid if no thread id is found, and
+   throws an error if the thread id has an invalid format.  */
 
 static ptid_t
-read_ptid (char *buf, char **obuf)
+read_ptid (const char *buf, const char **obuf)
 {
-  char *p = buf;
-  char *pp;
+  const char *p = buf;
+  const char *pp;
   ULONGEST pid = 0, tid = 0;
 
   if (*p == 'p')
@@ -3088,7 +3089,7 @@ remote_current_thread (ptid_t oldpid)
   getpkt (&rs->buf, &rs->buf_size, 0);
   if (rs->buf[0] == 'Q' && rs->buf[1] == 'C')
     {
-      char *obuf;
+      const char *obuf;
       ptid_t result;
 
       result = read_ptid (&rs->buf[2], &obuf);
@@ -3232,7 +3233,7 @@ remote_get_threads_with_qthreadinfo (struct target_ops *ops,
 
   if (rs->use_threadinfo_query)
     {
-      char *bufp;
+      const char *bufp;
 
       putpkt ("qfThreadInfo");
       getpkt (&rs->buf, &rs->buf_size, 0);
@@ -3482,7 +3483,7 @@ remote_static_tracepoint_marker_at (struct target_ops *self, CORE_ADDR addr,
 
   if (*p++ == 'm')
     {
-      parse_static_tracepoint_marker_definition (p, &p, marker);
+      parse_static_tracepoint_marker_definition (p, NULL, marker);
       return 1;
     }
 
@@ -3497,7 +3498,7 @@ remote_static_tracepoint_markers_by_strid (struct target_ops *self,
   VEC(static_tracepoint_marker_p) *markers = NULL;
   struct static_tracepoint_marker *marker = NULL;
   struct cleanup *old_chain;
-  char *p;
+  const char *p;
 
   /* Ask for a first packet of static tracepoint marker
      definition.  */
@@ -3790,7 +3791,7 @@ stop_reply_extract_thread (char *stop_reply)
 {
   if (stop_reply[0] == 'T' && strlen (stop_reply) > 3)
     {
-      char *p;
+      const char *p;
 
       /* Txx r:val ; r:val (...)  */
       p = &stop_reply[3];
@@ -3798,7 +3799,7 @@ stop_reply_extract_thread (char *stop_reply)
       /* Look for "register" named "thread".  */
       while (*p != '\0')
 	{
-	  char *p1;
+	  const char *p1;
 
 	  p1 = strchr (p, ':');
 	  if (p1 == NULL)
@@ -6836,7 +6837,7 @@ remote_parse_stop_reply (char *buf, struct stop_reply *event)
 {
   struct remote_arch_state *rsa = get_remote_arch_state ();
   ULONGEST addr;
-  char *p;
+  const char *p;
   int skipregs = 0;
 
   event->ptid = null_ptid;
@@ -6860,7 +6861,7 @@ remote_parse_stop_reply (char *buf, struct stop_reply *event)
       p = &buf[3];	/* after Txx */
       while (*p)
 	{
-	  char *p1;
+	  const char *p1;
 	  int fieldsize;
 
 	  p1 = strchr (p, ':');
@@ -6998,7 +6999,7 @@ Packet: '%s'\n"),
 	  else
 	    {
 	      ULONGEST pnum;
-	      char *p_temp;
+	      const char *p_temp;
 
 	      if (skipregs)
 		{
@@ -7068,7 +7069,7 @@ Packet: '%s'\n"),
       break;
     case 'w':		/* Thread exited.  */
       {
-	char *p;
+	const char *p;
 	ULONGEST value;
 
 	event->ws.kind = TARGET_WAITKIND_THREAD_EXITED;
@@ -7082,7 +7083,7 @@ Packet: '%s'\n"),
     case 'W':		/* Target exited.  */
     case 'X':
       {
-	char *p;
+	const char *p;
 	int pid;
 	ULONGEST value;
 
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index 30e3a3a..b6e7fe5 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -3405,9 +3405,9 @@ merge_uploaded_trace_state_variables (struct uploaded_tsv **uploaded_tsvs)
    the remote protocol and the trace file reader.  */
 
 void
-parse_trace_status (char *line, struct trace_status *ts)
+parse_trace_status (const char *line, struct trace_status *ts)
 {
-  char *p = line, *p1, *p2, *p3, *p_temp;
+  const char *p = line, *p1, *p2, *p3, *p_temp;
   int end;
   ULONGEST val;
 
@@ -3565,7 +3565,7 @@ Status line: '%s'\n"), p, line);
 }
 
 void
-parse_tracepoint_status (char *p, struct breakpoint *bp,
+parse_tracepoint_status (const char *p, struct breakpoint *bp,
 			 struct uploaded_tp *utp)
 {
   ULONGEST uval;
@@ -3588,14 +3588,15 @@ parse_tracepoint_status (char *p, struct breakpoint *bp,
    an "uploaded tracepoint".  */
 
 void
-parse_tracepoint_definition (char *line, struct uploaded_tp **utpp)
+parse_tracepoint_definition (const char *line, struct uploaded_tp **utpp)
 {
-  char *p;
+  const char *p;
   char piece;
   ULONGEST num, addr, step, pass, orig_size, xlen, start;
   int enabled, end;
   enum bptype type;
-  char *cond, *srctype, *buf;
+  const char *srctype;
+  char *cond, *buf;
   struct uploaded_tp *utp = NULL;
 
   p = line;
@@ -3703,9 +3704,10 @@ parse_tracepoint_definition (char *line, struct uploaded_tp **utpp)
    uploaded object.  */
 
 void
-parse_tsv_definition (char *line, struct uploaded_tsv **utsvp)
+parse_tsv_definition (const char *line, struct uploaded_tsv **utsvp)
 {
-  char *p, *buf;
+  const char *p;
+  char *buf;
   ULONGEST num, initval, builtin;
   int end;
   struct uploaded_tsv *utsv = NULL;
@@ -3749,10 +3751,10 @@ free_current_marker (void *arg)
    the parsed marker definition.  */
 
 void
-parse_static_tracepoint_marker_definition (char *line, char **pp,
+parse_static_tracepoint_marker_definition (const char *line, const char **pp,
 					   struct static_tracepoint_marker *marker)
 {
-  char *p, *endp;
+  const char *p, *endp;
   ULONGEST addr;
   int end;
 
diff --git a/gdb/tracepoint.h b/gdb/tracepoint.h
index 474563e..ffa645b 100644
--- a/gdb/tracepoint.h
+++ b/gdb/tracepoint.h
@@ -295,7 +295,7 @@ private:
 };
 
 extern void parse_static_tracepoint_marker_definition
-  (char *line, char **pp,
+  (const char *line, const char **pp,
    struct static_tracepoint_marker *marker);
 extern void release_static_tracepoint_marker (struct static_tracepoint_marker *);
 extern void free_current_marker (void *arg);
@@ -342,14 +342,14 @@ extern int encode_source_string (int num, ULONGEST addr,
 				 const char *srctype, const char *src,
 				 char *buf, int buf_size);
 
-extern void parse_trace_status (char *line, struct trace_status *ts);
+extern void parse_trace_status (const char *line, struct trace_status *ts);
 
-extern void parse_tracepoint_status (char *p, struct breakpoint *tp,
+extern void parse_tracepoint_status (const char *p, struct breakpoint *tp,
 				     struct uploaded_tp *utp);
 
-extern void parse_tracepoint_definition (char *line,
+extern void parse_tracepoint_definition (const char *line,
 					 struct uploaded_tp **utpp);
-extern void parse_tsv_definition (char *line, struct uploaded_tsv **utsvp);
+extern void parse_tsv_definition (const char *line, struct uploaded_tsv **utsvp);
 
 extern struct uploaded_tp *get_uploaded_tp (int num, ULONGEST addr,
 					    struct uploaded_tp **utpp);