move some rsp bits into rsp-low.h

This moves various low-level remote serial protocol bits into
common/rsp-low.[ch].

This is as close to a pure move as possible.  There are some
redundancies remaining but those will be dealt with in a subsequent
patch.

Note that the two variants of remote_escape_output disagreed on the
treatment of "*".  On the theory that quoting cannot hurt but the
absence possibly can, I chose the gdbserver variant to be the
canonical one.

2014-02-12  Tom Tromey  <tromey@redhat.com>

	* tracepoint.c: Include rsp-low.h.
	* remote.h (hex2bin, bin2hex, unpack_varlen_hex): Don't declare.
	* remote.c: Include rsp-low.h.
	(hexchars, ishex, unpack_varlen_hex, pack_nibble, pack_hex_byte)
	(fromhex, hex2bin, tohex, bin2hex, remote_escape_output)
	(remote_unescape_input): Move to common/rsp-low.c.
	* common/rsp-low.h: New file.
	* common/rsp-low.c: New file.
	* Makefile.in (SFILES): Add common/rsp-low.c.
	(HFILES_NO_SRCDIR): Add common/rsp-low.h.
	(COMMON_OBS): Add rsp-low.o.
	(rsp-low.o): New target.

2014-02-12  Tom Tromey  <tromey@redhat.com>

	* tracepoint.c: Include rsp-low.h.
	* server.c: Include rsp-low.h.
	* remote-utils.h (convert_ascii_to_int, convert_int_to_ascii)
	(unhexify, hexify, remote_escape_output, unpack_varlen_hex): Don't
	declare.
	* remote-utils.c: Include rsp-low.h.
	(fromhex, hexchars, ishex, unhexify, tohex, hexify)
	(remote_escape_output, remote_unescape_input, unpack_varlen_hex)
	(convert_int_to_ascii, convert_ascii_to_int): Move to
	common/rsp-low.c.
	* regcache.c: Include rsp-low.h.
	* ax.c: Include rsp-low.h.
	* Makefile.in (SFILES): Add common/rsp-low.c.
	(OBS): Add rsp-low.o.
	(rsp-low.o): New target.

15 files changed, 400 insertions, 447 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ebb334b..034e488 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,20 @@
 2014-02-12  Tom Tromey  <tromey@redhat.com>
 
+	* tracepoint.c: Include rsp-low.h.
+	* remote.h (hex2bin, bin2hex, unpack_varlen_hex): Don't declare.
+	* remote.c: Include rsp-low.h.
+	(hexchars, ishex, unpack_varlen_hex, pack_nibble, pack_hex_byte)
+	(fromhex, hex2bin, tohex, bin2hex, remote_escape_output)
+	(remote_unescape_input): Move to common/rsp-low.c.
+	* common/rsp-low.h: New file.
+	* common/rsp-low.c: New file.
+	* Makefile.in (SFILES): Add common/rsp-low.c.
+	(HFILES_NO_SRCDIR): Add common/rsp-low.h.
+	(COMMON_OBS): Add rsp-low.o.
+	(rsp-low.o): New target.
+
+2014-02-12  Tom Tromey  <tromey@redhat.com>
+
 	* utils.h: Include print-utils.h.
 	(host_address_to_string, plongest, pulongest, phex, phex_nz)
 	(int_string, core_addr_to_string, core_addr_to_string_nz)
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 21124f1..ea56854 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -839,7 +839,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	common/gdb_vecs.c common/common-utils.c common/xml-utils.c \
 	common/ptid.c common/buffer.c gdb-dlfcn.c common/agent.c \
 	common/format.c common/filestuff.c btrace.c record-btrace.c ctf.c \
-	target/waitstatus.c common/print-utils.c
+	target/waitstatus.c common/print-utils.c common/rsp-low.c
 
 LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
 
@@ -922,7 +922,7 @@ common/linux-osdata.h gdb-dlfcn.h auto-load.h probe.h stap-probe.h \
 gdb_bfd.h sparc-ravenscar-thread.h ppc-ravenscar-thread.h common/linux-btrace.h \
 ctf.h common/i386-cpuid.h common/i386-gcc-cpuid.h target/resume.h \
 target/wait.h target/waitstatus.h nat/linux-nat.h nat/linux-waitpid.h \
-common/print-utils.h
+common/print-utils.h common/rsp-low.h
 
 # Header files that already have srcdir in them, or which are in objdir.
 
@@ -1021,7 +1021,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
 	gdb_vecs.o jit.o progspace.o skip.o probe.o \
 	common-utils.o buffer.o ptid.o gdb-dlfcn.o common-agent.o \
 	format.o registry.o btrace.o record-btrace.o waitstatus.o \
-	print-utils.o
+	print-utils.o rsp-low.o
 
 TSOBS = inflow.o
 
@@ -2146,6 +2146,10 @@ print-utils.o: ${srcdir}/common/print-utils.c
 	$(COMPILE) $(srcdir)/common/print-utils.c
 	$(POSTCOMPILE)
 
+rsp-low.o: ${srcdir}/common/rsp-low.c
+	$(COMPILE) $(srcdir)/common/rsp-low.c
+	$(POSTCOMPILE)
+
 #
 # gdb/target/ dependencies
 #
diff --git a/gdb/common/rsp-low.c b/gdb/common/rsp-low.c
new file mode 100644
index 0000000..07e7ddb
--- /dev/null
+++ b/gdb/common/rsp-low.c
@@ -0,0 +1,277 @@
+/* Low-level RSP routines for GDB, the GNU debugger.
+
+   Copyright (C) 1988-2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef GDBSERVER
+#include "server.h"
+#else
+#include "defs.h"
+#endif
+
+#include <string.h>
+
+#include "rsp-low.h"
+
+/* Convert hex digit A to a number.  */
+
+int
+fromhex (int a)
+{
+  if (a >= '0' && a <= '9')
+    return a - '0';
+  else if (a >= 'a' && a <= 'f')
+    return a - 'a' + 10;
+  else if (a >= 'A' && a <= 'F')
+    return a - 'A' + 10;
+  else
+    error (_("Reply contains invalid hex digit %d"), a);
+}
+
+int
+tohex (int nib)
+{
+  if (nib < 10)
+    return '0' + nib;
+  else
+    return 'a' + nib - 10;
+}
+
+/* Encode 64 bits in 16 chars of hex.  */
+
+static const char hexchars[] = "0123456789abcdef";
+
+static int
+ishex (int ch, int *val)
+{
+  if ((ch >= 'a') && (ch <= 'f'))
+    {
+      *val = ch - 'a' + 10;
+      return 1;
+    }
+  if ((ch >= 'A') && (ch <= 'F'))
+    {
+      *val = ch - 'A' + 10;
+      return 1;
+    }
+  if ((ch >= '0') && (ch <= '9'))
+    {
+      *val = ch - '0';
+      return 1;
+    }
+  return 0;
+}
+
+char *
+pack_nibble (char *buf, int nibble)
+{
+  *buf++ = hexchars[(nibble & 0x0f)];
+  return buf;
+}
+
+char *
+pack_hex_byte (char *pkt, int byte)
+{
+  *pkt++ = hexchars[(byte >> 4) & 0xf];
+  *pkt++ = hexchars[(byte & 0xf)];
+  return pkt;
+}
+
+char *
+unpack_varlen_hex (char *buff,	/* packet to parse */
+		   ULONGEST *result)
+{
+  int nibble;
+  ULONGEST retval = 0;
+
+  while (ishex (*buff, &nibble))
+    {
+      buff++;
+      retval = retval << 4;
+      retval |= nibble & 0x0f;
+    }
+  *result = retval;
+  return buff;
+}
+
+int
+hex2bin (const char *hex, gdb_byte *bin, int count)
+{
+  int i;
+
+  for (i = 0; i < count; i++)
+    {
+      if (hex[0] == 0 || hex[1] == 0)
+	{
+	  /* Hex string is short, or of uneven length.
+	     Return the count that has been converted so far.  */
+	  return i;
+	}
+      *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
+      hex += 2;
+    }
+  return i;
+}
+
+int
+unhexify (char *bin, const char *hex, int count)
+{
+  int i;
+
+  for (i = 0; i < count; i++)
+    {
+      if (hex[0] == 0 || hex[1] == 0)
+	{
+	  /* Hex string is short, or of uneven length.
+	     Return the count that has been converted so far. */
+	  return i;
+	}
+      *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
+      hex += 2;
+    }
+  return i;
+}
+
+void
+convert_ascii_to_int (const char *from, unsigned char *to, int n)
+{
+  int nib1, nib2;
+  while (n--)
+    {
+      nib1 = fromhex (*from++);
+      nib2 = fromhex (*from++);
+      *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f);
+    }
+}
+
+int
+bin2hex (const gdb_byte *bin, char *hex, int count)
+{
+  int i;
+
+  /* May use a length, or a nul-terminated string as input.  */
+  if (count == 0)
+    count = strlen ((char *) bin);
+
+  for (i = 0; i < count; i++)
+    {
+      *hex++ = tohex ((*bin >> 4) & 0xf);
+      *hex++ = tohex (*bin++ & 0xf);
+    }
+  *hex = 0;
+  return i;
+}
+
+int
+hexify (char *hex, const char *bin, int count)
+{
+  int i;
+
+  /* May use a length, or a nul-terminated string as input. */
+  if (count == 0)
+    count = strlen (bin);
+
+  for (i = 0; i < count; i++)
+    {
+      *hex++ = tohex ((*bin >> 4) & 0xf);
+      *hex++ = tohex (*bin++ & 0xf);
+    }
+  *hex = 0;
+  return i;
+}
+
+void
+convert_int_to_ascii (const unsigned char *from, char *to, int n)
+{
+  int nib;
+  int ch;
+  while (n--)
+    {
+      ch = *from++;
+      nib = ((ch & 0xf0) >> 4) & 0x0f;
+      *to++ = tohex (nib);
+      nib = ch & 0x0f;
+      *to++ = tohex (nib);
+    }
+  *to++ = 0;
+}
+
+int
+remote_escape_output (const gdb_byte *buffer, int len,
+		      gdb_byte *out_buf, int *out_len,
+		      int out_maxlen)
+{
+  int input_index, output_index;
+
+  output_index = 0;
+  for (input_index = 0; input_index < len; input_index++)
+    {
+      gdb_byte b = buffer[input_index];
+
+      if (b == '$' || b == '#' || b == '}' || b == '*')
+	{
+	  /* These must be escaped.  */
+	  if (output_index + 2 > out_maxlen)
+	    break;
+	  out_buf[output_index++] = '}';
+	  out_buf[output_index++] = b ^ 0x20;
+	}
+      else
+	{
+	  if (output_index + 1 > out_maxlen)
+	    break;
+	  out_buf[output_index++] = b;
+	}
+    }
+
+  *out_len = input_index;
+  return output_index;
+}
+
+int
+remote_unescape_input (const gdb_byte *buffer, int len,
+		       gdb_byte *out_buf, int out_maxlen)
+{
+  int input_index, output_index;
+  int escaped;
+
+  output_index = 0;
+  escaped = 0;
+  for (input_index = 0; input_index < len; input_index++)
+    {
+      gdb_byte b = buffer[input_index];
+
+      if (output_index + 1 > out_maxlen)
+	error (_("Received too much data from the target."));
+
+      if (escaped)
+	{
+	  out_buf[output_index++] = b ^ 0x20;
+	  escaped = 0;
+	}
+      else if (b == '}')
+	escaped = 1;
+      else
+	out_buf[output_index++] = b;
+    }
+
+  if (escaped)
+    error (_("Unmatched escape character in target response."));
+
+  return output_index;
+}
+
diff --git a/gdb/common/rsp-low.h b/gdb/common/rsp-low.h
new file mode 100644
index 0000000..161c4a2
--- /dev/null
+++ b/gdb/common/rsp-low.h
@@ -0,0 +1,70 @@
+/* Low-level RSP routines for GDB, the GNU debugger.
+
+   Copyright (C) 1988-2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef COMMON_RSP_LOW_H
+#define COMMON_RSP_LOW_H
+
+/* Convert hex digit A to a number, or throw an exception.  */
+
+extern int fromhex (int a);
+
+/* Convert number NIB to a hex digit.  */
+
+extern int tohex (int nib);
+
+extern char *pack_nibble (char *buf, int nibble);
+
+extern char *pack_hex_byte (char *pkt, int byte);
+
+extern char *unpack_varlen_hex (char *buff, ULONGEST *result);
+
+extern int hex2bin (const char *hex, gdb_byte *bin, int count);
+
+extern int unhexify (char *bin, const char *hex, int count);
+
+extern void convert_ascii_to_int (const char *from, unsigned char *to, int n);
+
+extern int bin2hex (const gdb_byte *bin, char *hex, int count);
+
+extern int hexify (char *hex, const char *bin, int count);
+
+extern void convert_int_to_ascii (const unsigned char *from, char *to, int n);
+
+/* Convert BUFFER, binary data at least LEN bytes long, into escaped
+   binary data in OUT_BUF.  Set *OUT_LEN to the length of the data
+   encoded in OUT_BUF, and return the number of bytes in OUT_BUF
+   (which may be more than *OUT_LEN due to escape characters).  The
+   total number of bytes in the output buffer will be at most
+   OUT_MAXLEN.  This function properly escapes '*', and so is suitable
+   for the server side as well as the client.  */
+
+extern int remote_escape_output (const gdb_byte *buffer, int len,
+				 gdb_byte *out_buf, int *out_len,
+				 int out_maxlen);
+
+/* Convert BUFFER, escaped data LEN bytes long, into binary data
+   in OUT_BUF.  Return the number of bytes written to OUT_BUF.
+   Raise an error if the total number of bytes exceeds OUT_MAXLEN.
+
+   This function reverses remote_escape_output.  */
+
+extern int remote_unescape_input (const gdb_byte *buffer, int len,
+				  gdb_byte *out_buf, int out_maxlen);
+
+#endif /* COMMON_RSP_LOW_H */
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 9cbd5ee..7bf4a0f 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,5 +1,23 @@
 2014-02-12  Tom Tromey  <tromey@redhat.com>
 
+	* tracepoint.c: Include rsp-low.h.
+	* server.c: Include rsp-low.h.
+	* remote-utils.h (convert_ascii_to_int, convert_int_to_ascii)
+	(unhexify, hexify, remote_escape_output, unpack_varlen_hex): Don't
+	declare.
+	* remote-utils.c: Include rsp-low.h.
+	(fromhex, hexchars, ishex, unhexify, tohex, hexify)
+	(remote_escape_output, remote_unescape_input, unpack_varlen_hex)
+	(convert_int_to_ascii, convert_ascii_to_int): Move to
+	common/rsp-low.c.
+	* regcache.c: Include rsp-low.h.
+	* ax.c: Include rsp-low.h.
+	* Makefile.in (SFILES): Add common/rsp-low.c.
+	(OBS): Add rsp-low.o.
+	(rsp-low.o): New target.
+
+2014-02-12  Tom Tromey  <tromey@redhat.com>
+
 	* utils.h (pulongest, plongest, phex_nz): Don't declare.
 	Include print-utils.h.
 	* utils.c (NUMCELLS, CELLSIZE, get_cell, decimal2str, pulongest)
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 654dfca..5f69ddb 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -163,7 +163,8 @@ SFILES=	$(srcdir)/gdbreplay.c $(srcdir)/inferiors.c $(srcdir)/dll.c \
 	$(srcdir)/common/linux-osdata.c $(srcdir)/common/ptid.c \
 	$(srcdir)/common/buffer.c $(srcdir)/common/linux-btrace.c \
 	$(srcdir)/common/filestuff.c $(srcdir)/target/waitstatus.c \
-	$(srcdir)/common/mips-linux-watch.c $(srcdir)/common/print-utils.c
+	$(srcdir)/common/mips-linux-watch.c $(srcdir)/common/print-utils.c \
+	$(srcdir)/common/rsp-low.c
 
 DEPFILES = @GDBSERVER_DEPFILES@
 
@@ -176,7 +177,7 @@ OBS = agent.o ax.o inferiors.o regcache.o remote-utils.o server.o signals.o \
       target.o waitstatus.o utils.o debug.o version.o vec.o gdb_vecs.o \
       mem-break.o hostio.o event-loop.o tracepoint.o xml-utils.o \
       common-utils.o ptid.o buffer.o format.o filestuff.o dll.o notif.o \
-      tdesc.o print-utils.o $(XML_BUILTIN) $(DEPFILES) $(LIBOBJS)
+      tdesc.o print-utils.o rsp-low.o $(XML_BUILTIN) $(DEPFILES) $(LIBOBJS)
 GDBREPLAY_OBS = gdbreplay.o version.o
 GDBSERVER_LIBS = @GDBSERVER_LIBS@
 XM_CLIBS = @LIBS@
@@ -485,6 +486,9 @@ signals.o: ../common/signals.c
 print-utils.o: ../common/print-utils.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
+rsp-low.o: ../common/rsp-low.c
+	$(COMPILE) $<
+	$(POSTCOMPILE)
 linux-procfs.o: ../common/linux-procfs.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
diff --git a/gdb/gdbserver/ax.c b/gdb/gdbserver/ax.c
index d0f5b30..f62a613 100644
--- a/gdb/gdbserver/ax.c
+++ b/gdb/gdbserver/ax.c
@@ -20,6 +20,7 @@
 #include "ax.h"
 #include "format.h"
 #include "tracepoint.h"
+#include "rsp-low.h"
 
 static void ax_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 
diff --git a/gdb/gdbserver/regcache.c b/gdb/gdbserver/regcache.c
index ee4e2a8..f51e498 100644
--- a/gdb/gdbserver/regcache.c
+++ b/gdb/gdbserver/regcache.c
@@ -20,6 +20,7 @@
 #include "regdef.h"
 #include "gdbthread.h"
 #include "tdesc.h"
+#include "rsp-low.h"
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c
index 3b88995..b835175 100644
--- a/gdb/gdbserver/remote-utils.c
+++ b/gdb/gdbserver/remote-utils.c
@@ -22,6 +22,7 @@
 #include "gdbthread.h"
 #include "tdesc.h"
 #include "dll.h"
+#include "rsp-low.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -417,66 +418,10 @@ remote_close (void)
   reset_readchar ();
 }
 
-/* Convert hex digit A to a number.  */
-
-static int
-fromhex (int a)
-{
-  if (a >= '0' && a <= '9')
-    return a - '0';
-  else if (a >= 'a' && a <= 'f')
-    return a - 'a' + 10;
-  else
-    error ("Reply contains invalid hex digit");
-  return 0;
-}
-
 #endif
 
-static const char hexchars[] = "0123456789abcdef";
-
-static int
-ishex (int ch, int *val)
-{
-  if ((ch >= 'a') && (ch <= 'f'))
-    {
-      *val = ch - 'a' + 10;
-      return 1;
-    }
-  if ((ch >= 'A') && (ch <= 'F'))
-    {
-      *val = ch - 'A' + 10;
-      return 1;
-    }
-  if ((ch >= '0') && (ch <= '9'))
-    {
-      *val = ch - '0';
-      return 1;
-    }
-  return 0;
-}
-
 #ifndef IN_PROCESS_AGENT
 
-int
-unhexify (char *bin, const char *hex, int count)
-{
-  int i;
-
-  for (i = 0; i < count; i++)
-    {
-      if (hex[0] == 0 || hex[1] == 0)
-	{
-	  /* Hex string is short, or of uneven length.
-	     Return the count that has been converted so far. */
-	  return i;
-	}
-      *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
-      hex += 2;
-    }
-  return i;
-}
-
 void
 decode_address (CORE_ADDR *addrp, const char *start, int len)
 {
@@ -512,118 +457,8 @@ decode_address_to_semicolon (CORE_ADDR *addrp, const char *start)
 
 #endif
 
-/* Convert number NIB to a hex digit.  */
-
-static int
-tohex (int nib)
-{
-  if (nib < 10)
-    return '0' + nib;
-  else
-    return 'a' + nib - 10;
-}
-
 #ifndef IN_PROCESS_AGENT
 
-int
-hexify (char *hex, const char *bin, int count)
-{
-  int i;
-
-  /* May use a length, or a nul-terminated string as input. */
-  if (count == 0)
-    count = strlen (bin);
-
-  for (i = 0; i < count; i++)
-    {
-      *hex++ = tohex ((*bin >> 4) & 0xf);
-      *hex++ = tohex (*bin++ & 0xf);
-    }
-  *hex = 0;
-  return i;
-}
-
-/* Convert BUFFER, binary data at least LEN bytes long, into escaped
-   binary data in OUT_BUF.  Set *OUT_LEN to the length of the data
-   encoded in OUT_BUF, and return the number of bytes in OUT_BUF
-   (which may be more than *OUT_LEN due to escape characters).  The
-   total number of bytes in the output buffer will be at most
-   OUT_MAXLEN.  */
-
-int
-remote_escape_output (const gdb_byte *buffer, int len,
-		      gdb_byte *out_buf, int *out_len,
-		      int out_maxlen)
-{
-  int input_index, output_index;
-
-  output_index = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (b == '$' || b == '#' || b == '}' || b == '*')
-	{
-	  /* These must be escaped.  */
-	  if (output_index + 2 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = '}';
-	  out_buf[output_index++] = b ^ 0x20;
-	}
-      else
-	{
-	  if (output_index + 1 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = b;
-	}
-    }
-
-  *out_len = input_index;
-  return output_index;
-}
-
-/* Convert BUFFER, escaped data LEN bytes long, into binary data
-   in OUT_BUF.  Return the number of bytes written to OUT_BUF.
-   Raise an error if the total number of bytes exceeds OUT_MAXLEN.
-
-   This function reverses remote_escape_output.  It allows more
-   escaped characters than that function does, in particular because
-   '*' must be escaped to avoid the run-length encoding processing
-   in reading packets.  */
-
-static int
-remote_unescape_input (const gdb_byte *buffer, int len,
-		       gdb_byte *out_buf, int out_maxlen)
-{
-  int input_index, output_index;
-  int escaped;
-
-  output_index = 0;
-  escaped = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (output_index + 1 > out_maxlen)
-	error ("Received too much data from the target.");
-
-      if (escaped)
-	{
-	  out_buf[output_index++] = b ^ 0x20;
-	  escaped = 0;
-	}
-      else if (b == '}')
-	escaped = 1;
-      else
-	out_buf[output_index++] = b;
-    }
-
-  if (escaped)
-    error ("Unmatched escape character in target response.");
-
-  return output_index;
-}
-
 /* Look for a sequence of characters which can be run-length encoded.
    If there are any, update *CSUM and *P.  Otherwise, output the
    single character.  Return the number of characters consumed.  */
@@ -670,23 +505,6 @@ try_rle (char *buf, int remaining, unsigned char *csum, char **p)
 
 #endif
 
-char *
-unpack_varlen_hex (char *buff,	/* packet to parse */
-		   ULONGEST *result)
-{
-  int nibble;
-  ULONGEST retval = 0;
-
-  while (ishex (*buff, &nibble))
-    {
-      buff++;
-      retval = retval << 4;
-      retval |= nibble & 0x0f;
-    }
-  *result = retval;
-  return buff;
-}
-
 #ifndef IN_PROCESS_AGENT
 
 /* Write a PTID to BUF.  Returns BUF+CHARACTERS_WRITTEN.  */
@@ -1230,36 +1048,8 @@ write_enn (char *buf)
 
 #endif
 
-void
-convert_int_to_ascii (const unsigned char *from, char *to, int n)
-{
-  int nib;
-  int ch;
-  while (n--)
-    {
-      ch = *from++;
-      nib = ((ch & 0xf0) >> 4) & 0x0f;
-      *to++ = tohex (nib);
-      nib = ch & 0x0f;
-      *to++ = tohex (nib);
-    }
-  *to++ = 0;
-}
-
 #ifndef IN_PROCESS_AGENT
 
-void
-convert_ascii_to_int (const char *from, unsigned char *to, int n)
-{
-  int nib1, nib2;
-  while (n--)
-    {
-      nib1 = fromhex (*from++);
-      nib2 = fromhex (*from++);
-      *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f);
-    }
-}
-
 static char *
 outreg (struct regcache *regcache, int regno, char *buf)
 {
diff --git a/gdb/gdbserver/remote-utils.h b/gdb/gdbserver/remote-utils.h
index f2f1aa3..a79a35f 100644
--- a/gdb/gdbserver/remote-utils.h
+++ b/gdb/gdbserver/remote-utils.h
@@ -44,8 +44,6 @@ void initialize_async_io (void);
 void enable_async_io (void);
 void disable_async_io (void);
 void check_remote_input_interrupt_request (void);
-void convert_ascii_to_int (const char *from, unsigned char *to, int n);
-void convert_int_to_ascii (const unsigned char *from, char *to, int n);
 void new_thread_notify (int id);
 void dead_thread_notify (int id);
 void prepare_resume_reply (char *buf, ptid_t ptid,
@@ -68,13 +66,6 @@ int decode_search_memory_packet (const char *buf, int packet_len,
 				 gdb_byte *pattern,
 				 unsigned int *pattern_lenp);
 
-int unhexify (char *bin, const char *hex, int count);
-int hexify (char *hex, const char *bin, int count);
-int remote_escape_output (const gdb_byte *buffer, int len,
-			  gdb_byte *out_buf, int *out_len,
-			  int out_maxlen);
-char *unpack_varlen_hex (char *buff,  ULONGEST *result);
-
 void clear_symbol_cache (struct sym_cache **symcache_p);
 int look_up_one_symbol (const char *name, CORE_ADDR *addrp, int may_ask_gdb);
 
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 88354be..e09f2d5 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -21,6 +21,7 @@
 #include "agent.h"
 #include "notif.h"
 #include "tdesc.h"
+#include "rsp-low.h"
 
 #include <ctype.h>
 #include <unistd.h>
diff --git a/gdb/gdbserver/tracepoint.c b/gdb/gdbserver/tracepoint.c
index 3706577..c61f1d5 100644
--- a/gdb/gdbserver/tracepoint.c
+++ b/gdb/gdbserver/tracepoint.c
@@ -20,6 +20,7 @@
 #include "tracepoint.h"
 #include "gdbthread.h"
 #include "agent.h"
+#include "rsp-low.h"
 
 #include <ctype.h>
 #include <fcntl.h>
diff --git a/gdb/remote.c b/gdb/remote.c
index eff4c44..eaaeb74 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -45,6 +45,7 @@
 #include "target-descriptions.h"
 #include "gdb_bfd.h"
 #include "filestuff.h"
+#include "rsp-low.h"
 
 #include <sys/time.h>
 
@@ -124,8 +125,6 @@ static void remote_serial_write (const char *str, int len);
 
 static void remote_kill (struct target_ops *ops);
 
-static int tohex (int nib);
-
 static int remote_can_async_p (void);
 
 static int remote_is_async_p (void);
@@ -154,8 +153,6 @@ static void init_extended_remote_ops (void);
 
 static void remote_stop (ptid_t);
 
-static int ishex (int ch, int *val);
-
 static int stubhex (int ch);
 
 static int hexnumstr (char *, ULONGEST);
@@ -176,8 +173,6 @@ static ptid_t remote_current_thread (ptid_t oldptid);
 
 static void remote_find_new_threads (void);
 
-static int fromhex (int a);
-
 static int putpkt_binary (char *buf, int cnt);
 
 static void check_binary_download (CORE_ADDR addr);
@@ -1937,14 +1932,8 @@ struct gdb_ext_thread_info
 
 #define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES * 2)
 
-char *unpack_varlen_hex (char *buff, ULONGEST *result);
-
 static char *unpack_nibble (char *buf, int *val);
 
-static char *pack_nibble (char *buf, int nibble);
-
-static char *pack_hex_byte (char *pkt, int /* unsigned char */ byte);
-
 static char *unpack_byte (char *buf, int *value);
 
 static char *pack_int (char *buf, int value);
@@ -2071,31 +2060,6 @@ read_ptid (char *buf, char **obuf)
   return ptid_build (pid, 0, tid);
 }
 
-/* Encode 64 bits in 16 chars of hex.  */
-
-static const char hexchars[] = "0123456789abcdef";
-
-static int
-ishex (int ch, int *val)
-{
-  if ((ch >= 'a') && (ch <= 'f'))
-    {
-      *val = ch - 'a' + 10;
-      return 1;
-    }
-  if ((ch >= 'A') && (ch <= 'F'))
-    {
-      *val = ch - 'A' + 10;
-      return 1;
-    }
-  if ((ch >= '0') && (ch <= '9'))
-    {
-      *val = ch - '0';
-      return 1;
-    }
-  return 0;
-}
-
 static int
 stubhex (int ch)
 {
@@ -2125,23 +2089,6 @@ stub_unpack_int (char *buff, int fieldlength)
   return retval;
 }
 
-char *
-unpack_varlen_hex (char *buff,	/* packet to parse */
-		   ULONGEST *result)
-{
-  int nibble;
-  ULONGEST retval = 0;
-
-  while (ishex (*buff, &nibble))
-    {
-      buff++;
-      retval = retval << 4;
-      retval |= nibble & 0x0f;
-    }
-  *result = retval;
-  return buff;
-}
-
 static char *
 unpack_nibble (char *buf, int *val)
 {
@@ -2150,21 +2097,6 @@ unpack_nibble (char *buf, int *val)
 }
 
 static char *
-pack_nibble (char *buf, int nibble)
-{
-  *buf++ = hexchars[(nibble & 0x0f)];
-  return buf;
-}
-
-static char *
-pack_hex_byte (char *pkt, int byte)
-{
-  *pkt++ = hexchars[(byte >> 4) & 0xf];
-  *pkt++ = hexchars[(byte & 0xf)];
-  return pkt;
-}
-
-static char *
 unpack_byte (char *buf, int *value)
 {
   *value = stub_unpack_int (buf, 2);
@@ -4665,68 +4597,6 @@ extended_remote_attach (struct target_ops *ops, char *args, int from_tty)
   extended_remote_attach_1 (ops, args, from_tty);
 }
 
-/* Convert hex digit A to a number.  */
-
-static int
-fromhex (int a)
-{
-  if (a >= '0' && a <= '9')
-    return a - '0';
-  else if (a >= 'a' && a <= 'f')
-    return a - 'a' + 10;
-  else if (a >= 'A' && a <= 'F')
-    return a - 'A' + 10;
-  else
-    error (_("Reply contains invalid hex digit %d"), a);
-}
-
-int
-hex2bin (const char *hex, gdb_byte *bin, int count)
-{
-  int i;
-
-  for (i = 0; i < count; i++)
-    {
-      if (hex[0] == 0 || hex[1] == 0)
-	{
-	  /* Hex string is short, or of uneven length.
-	     Return the count that has been converted so far.  */
-	  return i;
-	}
-      *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
-      hex += 2;
-    }
-  return i;
-}
-
-/* Convert number NIB to a hex digit.  */
-
-static int
-tohex (int nib)
-{
-  if (nib < 10)
-    return '0' + nib;
-  else
-    return 'a' + nib - 10;
-}
-
-int
-bin2hex (const gdb_byte *bin, char *hex, int count)
-{
-  int i;
-
-  /* May use a length, or a nul-terminated string as input.  */
-  if (count == 0)
-    count = strlen ((char *) bin);
-
-  for (i = 0; i < count; i++)
-    {
-      *hex++ = tohex ((*bin >> 4) & 0xf);
-      *hex++ = tohex (*bin++ & 0xf);
-    }
-  *hex = 0;
-  return i;
-}
 
 /* Check for the availability of vCont.  This function should also check
    the response.  */
@@ -6679,91 +6549,6 @@ remote_address_masked (CORE_ADDR addr)
   return addr;
 }
 
-/* Convert BUFFER, binary data at least LEN bytes long, into escaped
-   binary data in OUT_BUF.  Set *OUT_LEN to the length of the data
-   encoded in OUT_BUF, and return the number of bytes in OUT_BUF
-   (which may be more than *OUT_LEN due to escape characters).  The
-   total number of bytes in the output buffer will be at most
-   OUT_MAXLEN.  */
-
-static int
-remote_escape_output (const gdb_byte *buffer, int len,
-		      gdb_byte *out_buf, int *out_len,
-		      int out_maxlen)
-{
-  int input_index, output_index;
-
-  output_index = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (b == '$' || b == '#' || b == '}')
-	{
-	  /* These must be escaped.  */
-	  if (output_index + 2 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = '}';
-	  out_buf[output_index++] = b ^ 0x20;
-	}
-      else
-	{
-	  if (output_index + 1 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = b;
-	}
-    }
-
-  *out_len = input_index;
-  return output_index;
-}
-
-/* Convert BUFFER, escaped data LEN bytes long, into binary data
-   in OUT_BUF.  Return the number of bytes written to OUT_BUF.
-   Raise an error if the total number of bytes exceeds OUT_MAXLEN.
-
-   This function reverses remote_escape_output.  It allows more
-   escaped characters than that function does, in particular because
-   '*' must be escaped to avoid the run-length encoding processing
-   in reading packets.  */
-
-static int
-remote_unescape_input (const gdb_byte *buffer, int len,
-		       gdb_byte *out_buf, int out_maxlen)
-{
-  int input_index, output_index;
-  int escaped;
-
-  output_index = 0;
-  escaped = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (output_index + 1 > out_maxlen)
-	{
-	  warning (_("Received too much data from remote target;"
-		     " ignoring overflow."));
-	  return output_index;
-	}
-
-      if (escaped)
-	{
-	  out_buf[output_index++] = b ^ 0x20;
-	  escaped = 0;
-	}
-      else if (b == '}')
-	escaped = 1;
-      else
-	out_buf[output_index++] = b;
-    }
-
-  if (escaped)
-    error (_("Unmatched escape character in target response."));
-
-  return output_index;
-}
-
 /* Determine whether the remote target supports binary downloading.
    This is accomplished by sending a no-op memory write of zero length
    to the target at the specified address. It does not suffice to send
diff --git a/gdb/remote.h b/gdb/remote.h
index 98c47b1..46b73d9 100644
--- a/gdb/remote.h
+++ b/gdb/remote.h
@@ -39,12 +39,6 @@ extern void getpkt (char **buf, long *sizeof_buf, int forever);
 
 extern int putpkt (char *buf);
 
-extern int hex2bin (const char *hex, gdb_byte *bin, int count);
-
-extern int bin2hex (const gdb_byte *bin, char *hex, int count);
-
-extern char *unpack_varlen_hex (char *buff, ULONGEST *result);
-
 void register_remote_g_packet_guess (struct gdbarch *gdbarch, int bytes,
 				     const struct target_desc *tdesc);
 void register_remote_support_xml (const char *);
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index 2cb7442..b013d88 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -55,6 +55,7 @@
 #include "probe.h"
 #include "ctf.h"
 #include "filestuff.h"
+#include "rsp-low.h"
 
 /* readline include files */
 #include "readline/readline.h"