2004-09-30 Kei Sakamoto <sakamoto.kei@renesas.com>

        Add m32r-linux support.
        * configure.tgt: Add m32r*-*-linux*.
        * Makefile.in (ALLDEPFILES): Add m32r-tdep.c, m32r-linux-nat.c
        and m32r-linux-tdep.c.
        (m32r-linux-nat.o, m32r-linux-tdep.o): New dependencies.
        * m32r-tdep.c: Move some definitions to m32r-tdep.h.
        * config/djgpp/fnchange.lst: Add m32r-linux-nat.c and
        m32r-linux-tdep.c.
        * m32r-tdep.h, m32r-linux-nat.c, m32r-linux-tdep.c,
        config/m32r/linux.mh, config/m32r/linux.mt,
        config/m32r/nm-linux.h: New files.

11 files changed, 701 insertions, 33 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a2aeda23fca..95b5c605671 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,17 @@
+2004-09-30    Kei Sakamoto  <sakamoto.kei@renesas.com>
+
+	Add m32r-linux support.
+	* configure.tgt: Add m32r*-*-linux*.
+	* Makefile.in (ALLDEPFILES): Add m32r-tdep.c, m32r-linux-nat.c
+	and m32r-linux-tdep.c.
+	(m32r-linux-nat.o, m32r-linux-tdep.o): New dependencies.
+	* m32r-tdep.c: Move some definitions to m32r-tdep.h.
+	* config/djgpp/fnchange.lst: Add m32r-linux-nat.c and
+	m32r-linux-tdep.c.
+	* m32r-tdep.h, m32r-linux-nat.c, m32r-linux-tdep.c,
+	config/m32r/linux.mh, config/m32r/linux.mt,
+	config/m32r/nm-linux.h: New files.
+
 2004-09-30  Joel Brobecker  <brobecker@gnat.com>
 
 	* mips-tdep.c (mips32_decode_reg_save): Remove, unused.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 7b9ed712f3d..f4b73a42e39 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -720,6 +720,7 @@ libunwind_frame_h = libunwind-frame.h $(libunwind_h)
 linespec_h = linespec.h
 linux_nat_h = linux-nat.h $(target_h)
 m2_lang_h = m2-lang.h
+m32r_tdep_h = m32r-tdep.h
 m68k_tdep_h = m68k-tdep.h
 m88k_tdep_h = m88k-tdep.h
 macroexp_h = macroexp.h
@@ -1382,6 +1383,8 @@ ALLDEPFILES = \
 	libunwind-frame.c \
 	lynx-nat.c m3-nat.c \
 	m68hc11-tdep.c \
+	m32r-tdep.c \
+	m32r-linux-nat.c m32r-linux-tdep.c \
 	m68k-tdep.c \
 	m68kbsd-nat.c m68kbsd-tdep.c \
 	m88k-tdep.c m88kbsd-nat.c \
@@ -2131,6 +2134,12 @@ m2-typeprint.o: m2-typeprint.c $(defs_h) $(bfd_h) $(symtab_h) $(gdbtypes_h) \
 	$(expression_h) $(value_h) $(gdbcore_h) $(target_h) $(m2_lang_h)
 m2-valprint.o: m2-valprint.c $(defs_h) $(symtab_h) $(gdbtypes_h) \
 	$(m2_lang_h)
+m32r-linux-nat.o: m32r-linux-nat.c $(defs_h) $(inferior_h) $(gdbcore_h) \
+	$(regcache_h) $(linux_nat_h) $(gdb_assert_h) $(gdb_string_h) \
+	$(m32r_tdep_h)
+m32r-linux-tdep.o: m32r-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
+	$(value_h) $(regcache_h) $(inferior_h) $(osabi_h) $(reggroups_h) \
+	$(gdb_string_h) $(glibc_tdep_h) $(solib_svr4_h) $(m32r_tdep_h)
 m32r-rom.o: m32r-rom.c $(defs_h) $(gdbcore_h) $(target_h) $(monitor_h) \
 	$(serial_h) $(symtab_h) $(command_h) $(gdbcmd_h) $(symfile_h) \
 	$(gdb_string_h) $(objfiles_h) $(inferior_h) $(regcache_h)
@@ -2139,7 +2148,7 @@ m32r-tdep.o: m32r-tdep.c $(defs_h) $(frame_h) $(frame_unwind_h) \
 	$(frame_base_h) $(symtab_h) $(gdbtypes_h) $(gdbcmd_h) $(gdbcore_h) \
 	$(gdb_string_h) $(value_h) $(inferior_h) $(symfile_h) $(objfiles_h) \
 	$(language_h) $(arch_utils_h) $(regcache_h) $(trad_frame_h) \
-	$(dis_asm_h) $(gdb_assert_h)
+	$(dis_asm_h) $(gdb_assert_h) $(m32r_tdep_h)
 m68hc11-tdep.o: m68hc11-tdep.c $(defs_h) $(frame_h) $(frame_unwind_h) \
 	$(frame_base_h) $(dwarf2_frame_h) $(trad_frame_h) $(symtab_h) \
 	$(gdbtypes_h) $(gdbcmd_h) $(gdbcore_h) $(gdb_string_h) $(value_h) \
diff --git a/gdb/config/djgpp/fnchange.lst b/gdb/config/djgpp/fnchange.lst
index 4337b7261a0..a63c9d6b0a2 100644
--- a/gdb/config/djgpp/fnchange.lst
+++ b/gdb/config/djgpp/fnchange.lst
@@ -138,6 +138,8 @@
 @V@/gdb/ia64-linux-nat.c @V@/gdb/ia64lx-tdep.c
 @V@/gdb/jv-exp.tab.c @V@/gdb/jv-exp_tab.c
 @V@/gdb/m2-exp.tab.c @V@/gdb/m2-exp_tab.c
+@V@/gdb/m32r-linux-nat.c @V@/gdb/m32rlnxnat.c
+@V@/gdb/m32r-linux-tdep.c @V@/gdb/m32rlnxtdep.c
 @V@/gdb/m68klinux-nat.c @V@/gdb/m68kl-nat.c
 @V@/gdb/m68klinux-tdep.c @V@/gdb/m68kl-tdep.c
 @V@/gdb/m68kbsd-nat.c @V@/gdb/m68bsd-nat.c
diff --git a/gdb/config/m32r/linux.mh b/gdb/config/m32r/linux.mh
new file mode 100644
index 00000000000..bfa8cf60fe8
--- /dev/null
+++ b/gdb/config/m32r/linux.mh
@@ -0,0 +1,8 @@
+# Host: M32R based machine running GNU/Linux
+
+NAT_FILE= nm-linux.h
+NATDEPFILES= infptrace.o inftarg.o fork-child.o corelow.o	\
+	m32r-linux-nat.o gcore.o proc-service.o thread-db.o	\
+	linux-nat.o
+
+LOADLIBES= -ldl -rdynamic
diff --git a/gdb/config/m32r/linux.mt b/gdb/config/m32r/linux.mt
new file mode 100644
index 00000000000..09e5630f8fb
--- /dev/null
+++ b/gdb/config/m32r/linux.mt
@@ -0,0 +1,6 @@
+# Target: Renesas M32R running GNU/Linux
+TDEPFILES= m32r-tdep.o m32r-linux-tdep.o remote-m32r-sdi.o glibc-tdep.o solib.o solib-svr4.o solib-legacy.o
+DEPRECATED_TM_FILE= config/tm-linux.h
+
+SIM_OBS = remote-sim.o
+SIM = ../sim/m32r/libsim.a
diff --git a/gdb/config/m32r/nm-linux.h b/gdb/config/m32r/nm-linux.h
new file mode 100644
index 00000000000..ecfeebad88a
--- /dev/null
+++ b/gdb/config/m32r/nm-linux.h
@@ -0,0 +1,29 @@
+/* Definitions to make GDB run on an M32R based machine under GNU/Linux.
+   Copyright 2004 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef NM_M32R_LINUX_H
+#define NM_M32R_LINUX_H
+
+#include "config/nm-linux.h"
+
+/* Override copies of {fetch,store}_inferior_registers in infptrace.c.  */
+#define FETCH_INFERIOR_REGISTERS
+
+#endif /* NM_M32R_LINUX_H */
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index cb2427e8e09..0b1f627960e 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -106,7 +106,8 @@ ia64-*-linux*)		gdb_target=linux
 			;;
 ia64*-*-*)		gdb_target=ia64 ;;
 
-m32r-*-*)		gdb_target=m32r ;;
+m32r*-*-linux*)		gdb_target=linux ;;
+m32r*-*-*)		gdb_target=m32r ;;
 
 m68hc11*-*-*|m6811*-*-*)	gdb_target=m68hc11 ;;
 
diff --git a/gdb/m32r-linux-nat.c b/gdb/m32r-linux-nat.c
new file mode 100644
index 00000000000..7b35087319e
--- /dev/null
+++ b/gdb/m32r-linux-nat.c
@@ -0,0 +1,235 @@
+/* Native-dependent code for GNU/Linux m32r.
+
+   Copyright 2004 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "linux-nat.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+#include <sys/ptrace.h>
+#include <sys/user.h>
+#include <sys/procfs.h>
+
+/* Prototypes for supply_gregset etc.  */
+#include "gregset.h"
+
+#include "m32r-tdep.h"
+
+
+
+
+/* Since EVB register is not available for native debug, we reduce
+   the number of registers.  */
+#define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
+
+/* Mapping between the general-purpose registers in `struct user'
+   format and GDB's register array layout.  */
+static int regmap[] = {
+  4, 5, 6, 7, 0, 1, 2, 8,
+  9, 10, 11, 12, 13, 24, 25, 23,
+  19, 19, 26, 23, 22, 20, 16, 15
+};
+
+#define PSW_REGMAP 19
+#define BBPSW_REGMAP 21
+#define SPU_REGMAP 23
+#define SPI_REGMAP 26
+
+/* Doee apply to the corresponding SET requests as well.  */
+#define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS)
+
+
+
+/* Transfering the general-purpose registers between GDB, inferiors
+   and core files.  */
+
+/* Fill GDB's register array with the general-purpose register values
+   in *GREGSETP.  */
+
+void
+supply_gregset (elf_gregset_t * gregsetp)
+{
+  elf_greg_t *regp = (elf_greg_t *) gregsetp;
+  int i;
+  unsigned long psw, bbpsw;
+
+  psw = *(regp + PSW_REGMAP);
+  bbpsw = *(regp + BBPSW_REGMAP);
+
+  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
+    {
+      switch (i)
+	{
+	case PSW_REGNUM:
+	  *(regp + regmap[i]) =
+	    ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
+	  break;
+	case CBR_REGNUM:
+	  *(regp + regmap[i]) = ((psw >> 8) & 1);
+	  break;
+	}
+
+      if (i != M32R_SP_REGNUM)
+	regcache_raw_supply (current_regcache, i, regp + regmap[i]);
+      else if (psw & 0x8000)
+	regcache_raw_supply (current_regcache, i, regp + SPU_REGMAP);
+      else
+	regcache_raw_supply (current_regcache, i, regp + SPI_REGMAP);
+    }
+}
+
+/* Fetch all general-purpose registers from process/thread TID and
+   store their values in GDB's register array.  */
+
+static void
+fetch_regs (int tid)
+{
+  elf_gregset_t regs;
+
+  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
+    perror_with_name ("Couldn't get registers");
+
+  supply_gregset (&regs);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+
+void
+fill_gregset (elf_gregset_t * gregsetp, int regno)
+{
+  elf_greg_t *regp = (elf_greg_t *) gregsetp;
+  int i;
+  unsigned long psw, bbpsw, tmp;
+
+  psw = *(regp + PSW_REGMAP);
+  bbpsw = *(regp + BBPSW_REGMAP);
+
+  for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
+    {
+      if (regno != -1 && regno != i)
+	continue;
+
+      if (i == CBR_REGNUM || i == PSW_REGNUM)
+	continue;
+
+      if (i == SPU_REGNUM || i == SPI_REGNUM)
+	continue;
+
+      if (i != M32R_SP_REGNUM)
+	regcache_raw_collect (current_regcache, i, regp + regmap[i]);
+      else if (psw & 0x8000)
+	regcache_raw_collect (current_regcache, i, regp + SPU_REGMAP);
+      else
+	regcache_raw_collect (current_regcache, i, regp + SPI_REGMAP);
+    }
+}
+
+/* Store all valid general-purpose registers in GDB's register array
+   into the process/thread specified by TID.  */
+
+static void
+store_regs (int tid, int regno)
+{
+  elf_gregset_t regs;
+
+  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
+    perror_with_name ("Couldn't get registers");
+
+  fill_gregset (&regs, regno);
+
+  if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
+    perror_with_name ("Couldn't write registers");
+}
+
+
+
+/* Transfering floating-point registers between GDB, inferiors and cores.  
+   Since M32R has no floating-point registers, these functions do nothing.  */
+
+void
+supply_fpregset (gdb_fpregset_t *fpregs)
+{
+}
+
+void
+fill_fpregset (gdb_fpregset_t *fpregs, int regno)
+{
+}
+
+
+
+/* Transferring arbitrary registers between GDB and inferior.  */
+
+/* Fetch register REGNO from the child process.  If REGNO is -1, do
+   this for all registers (including the floating point and SSE
+   registers).  */
+
+void
+fetch_inferior_registers (int regno)
+{
+  int tid;
+
+  /* GNU/Linux LWP ID's are process ID's.  */
+  tid = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
+
+  /* Use the PTRACE_GETREGS request whenever possible, since it
+     transfers more registers in one system call, and we'll cache the
+     results.  */
+  if (regno == -1 || GETREGS_SUPPLIES (regno))
+    {
+      fetch_regs (tid);
+      return;
+    }
+
+  internal_error (__FILE__, __LINE__,
+		  "Got request for bad register number %d.", regno);
+}
+
+/* Store register REGNO back into the child process.  If REGNO is -1,
+   do this for all registers (including the floating point and SSE
+   registers).  */
+void
+store_inferior_registers (int regno)
+{
+  int tid;
+
+  /* GNU/Linux LWP ID's are process ID's.  */
+  if ((tid = TIDGET (inferior_ptid)) == 0)
+    tid = PIDGET (inferior_ptid);	/* Not a threaded program.  */
+
+  /* Use the PTRACE_SETREGS request whenever possible, since it
+     transfers more registers in one system call.  */
+  if (regno == -1 || GETREGS_SUPPLIES (regno))
+    {
+      store_regs (tid, regno);
+      return;
+    }
+
+  internal_error (__FILE__, __LINE__,
+		  "Got request to store bad register number %d.", regno);
+}
diff --git a/gdb/m32r-linux-tdep.c b/gdb/m32r-linux-tdep.c
new file mode 100644
index 00000000000..d2ca1a928f4
--- /dev/null
+++ b/gdb/m32r-linux-tdep.c
@@ -0,0 +1,336 @@
+/* Target-dependent code for GNU/Linux m32r.
+
+   Copyright 2004 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "frame.h"
+#include "value.h"
+#include "regcache.h"
+#include "inferior.h"
+#include "osabi.h"
+#include "reggroups.h"
+
+#include "gdb_string.h"
+
+#include "glibc-tdep.h"
+#include "solib-svr4.h"
+
+#include "trad-frame.h"
+#include "frame-unwind.h"
+
+#include "m32r-tdep.h"
+
+
+/* Recognizing signal handler frames.  */
+
+/* GNU/Linux has two flavors of signals.  Normal signal handlers, and
+   "realtime" (RT) signals.  The RT signals can provide additional
+   information to the signal handler if the SA_SIGINFO flag is set
+   when establishing a signal handler using `sigaction'.  It is not
+   unlikely that future versions of GNU/Linux will support SA_SIGINFO
+   for normal signals too.  */
+
+/* When the m32r Linux kernel calls a signal handler and the
+   SA_RESTORER flag isn't set, the return address points to a bit of
+   code on the stack.  This function returns whether the PC appears to
+   be within this bit of code.
+
+   The instruction sequence for normal signals is
+       ldi    r7, #__NR_sigreturn
+       trap   #2
+   or 0x67 0x77 0x10 0xf2.
+
+   Checking for the code sequence should be somewhat reliable, because
+   the effect is to call the system call sigreturn.  This is unlikely
+   to occur anywhere other than in a signal trampoline.
+
+   It kind of sucks that we have to read memory from the process in
+   order to identify a signal trampoline, but there doesn't seem to be
+   any other way.  Therefore we only do the memory reads if no
+   function name could be identified, which should be the case since
+   the code is on the stack.
+
+   Detection of signal trampolines for handlers that set the
+   SA_RESTORER flag is in general not possible.  Unfortunately this is
+   what the GNU C Library has been doing for quite some time now.
+   However, as of version 2.1.2, the GNU C Library uses signal
+   trampolines (named __restore and __restore_rt) that are identical
+   to the ones used by the kernel.  Therefore, these trampolines are
+   supported too.  */
+
+static const unsigned char linux_sigtramp_code[] = {
+  0x67, 0x77, 0x10, 0xf2,
+};
+
+/* If PC is in a sigtramp routine, return the address of the start of
+   the routine.  Otherwise, return 0.  */
+
+static CORE_ADDR
+m32r_linux_sigtramp_start (CORE_ADDR pc, struct frame_info *next_frame)
+{
+  unsigned char buf[4];
+
+  /* We only recognize a signal trampoline if PC is at the start of
+     one of the instructions.  We optimize for finding the PC at the
+     start of the instruction sequence, as will be the case when the
+     trampoline is not the first frame on the stack.  We assume that
+     in the case where the PC is not at the start of the instruction
+     sequence, there will be a few trailing readable bytes on the
+     stack.  */
+
+  if (pc % 2 != 0)
+    {
+      if (!safe_frame_unwind_memory (next_frame, pc, buf, 2))
+	return 0;
+
+      if (memcmp (buf, linux_sigtramp_code, 2) == 0)
+	pc -= 2;
+      else
+	return 0;
+    }
+
+  if (!safe_frame_unwind_memory (next_frame, pc, buf, 4))
+    return 0;
+
+  if (memcmp (buf, linux_sigtramp_code, 4) != 0)
+    return 0;
+
+  return pc;
+}
+
+/* This function does the same for RT signals.  Here the instruction
+   sequence is
+       ldi    r7, #__NR_rt_sigreturn
+       trap   #2
+   or 0x97 0xf0 0x00 0xad 0x10 0xf2 0xf0 0x00.
+
+   The effect is to call the system call rt_sigreturn.  */
+
+static const unsigned char linux_rt_sigtramp_code[] = {
+  0x97, 0xf0, 0x00, 0xad, 0x10, 0xf2, 0xf0, 0x00,
+};
+
+/* If PC is in a RT sigtramp routine, return the address of the start
+   of the routine.  Otherwise, return 0.  */
+
+static CORE_ADDR
+m32r_linux_rt_sigtramp_start (CORE_ADDR pc, struct frame_info *next_frame)
+{
+  unsigned char buf[4];
+
+  /* We only recognize a signal trampoline if PC is at the start of
+     one of the instructions.  We optimize for finding the PC at the
+     start of the instruction sequence, as will be the case when the
+     trampoline is not the first frame on the stack.  We assume that
+     in the case where the PC is not at the start of the instruction
+     sequence, there will be a few trailing readable bytes on the
+     stack.  */
+
+  if (pc % 2 != 0)
+    return 0;
+
+  if (!safe_frame_unwind_memory (next_frame, pc, buf, 4))
+    return 0;
+
+  if (memcmp (buf, linux_rt_sigtramp_code, 4) == 0)
+    {
+      if (!safe_frame_unwind_memory (next_frame, pc + 4, buf, 4))
+	return 0;
+
+      if (memcmp (buf, linux_rt_sigtramp_code + 4, 4) == 0)
+	return pc;
+    }
+  else if (memcmp (buf, linux_rt_sigtramp_code + 4, 4) == 0)
+    {
+      if (!safe_frame_unwind_memory (next_frame, pc - 4, buf, 4))
+	return 0;
+
+      if (memcmp (buf, linux_rt_sigtramp_code, 4) == 0)
+	return pc - 4;
+    }
+
+  return 0;
+}
+
+static int
+m32r_linux_pc_in_sigtramp (CORE_ADDR pc, char *name,
+			   struct frame_info *next_frame)
+{
+  /* If we have NAME, we can optimize the search.  The trampolines are
+     named __restore and __restore_rt.  However, they aren't dynamically
+     exported from the shared C library, so the trampoline may appear to
+     be part of the preceding function.  This should always be sigaction,
+     __sigaction, or __libc_sigaction (all aliases to the same function).  */
+  if (name == NULL || strstr (name, "sigaction") != NULL)
+    return (m32r_linux_sigtramp_start (pc, next_frame) != 0
+	    || m32r_linux_rt_sigtramp_start (pc, next_frame) != 0);
+
+  return (strcmp ("__restore", name) == 0
+	  || strcmp ("__restore_rt", name) == 0);
+}
+
+/* From <asm/sigcontext.h>.  */
+static int m32r_linux_sc_reg_offset[] = {
+  4 * 4,			/* r0 */
+  5 * 4,			/* r1 */
+  6 * 4,			/* r2 */
+  7 * 4,			/* r3 */
+  0 * 4,			/* r4 */
+  1 * 4,			/* r5 */
+  2 * 4,			/* r6 */
+  8 * 4,			/* r7 */
+  9 * 4,			/* r8 */
+  10 * 4,			/* r9 */
+  11 * 4,			/* r10 */
+  12 * 4,			/* r11 */
+  13 * 4,			/* r12 */
+  21 * 4,			/* fp */
+  22 * 4,			/* lr */
+  -1 * 4,			/* sp */
+  16 * 4,			/* psw */
+  -1 * 4,			/* cbr */
+  23 * 4,			/* spi */
+  20 * 4,			/* spu */
+  19 * 4,			/* bpc */
+  17 * 4,			/* pc */
+  15 * 4,			/* accl */
+  14 * 4			/* acch */
+};
+
+struct m32r_frame_cache
+{
+  CORE_ADDR base, pc;
+  struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct m32r_frame_cache *
+m32r_linux_sigtramp_frame_cache (struct frame_info *next_frame,
+				 void **this_cache)
+{
+  struct m32r_frame_cache *cache;
+  CORE_ADDR sigcontext_addr, addr;
+  int regnum;
+
+  if ((*this_cache) != NULL)
+    return (*this_cache);
+  cache = FRAME_OBSTACK_ZALLOC (struct m32r_frame_cache);
+  (*this_cache) = cache;
+  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+  cache->base = frame_unwind_register_unsigned (next_frame, M32R_SP_REGNUM);
+  sigcontext_addr = cache->base + 4;
+
+  cache->pc = frame_pc_unwind (next_frame);
+  addr = m32r_linux_sigtramp_start (cache->pc, next_frame);
+  if (addr == 0)
+    {
+      /* If this is a RT signal trampoline, adjust SIGCONTEXT_ADDR
+         accordingly.  */
+      addr = m32r_linux_rt_sigtramp_start (cache->pc, next_frame);
+      if (addr)
+	sigcontext_addr += 128;
+      else
+	addr = frame_func_unwind (next_frame);
+    }
+  cache->pc = addr;
+
+  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+  for (regnum = 0; regnum < sizeof (m32r_linux_sc_reg_offset) / 4; regnum++)
+    {
+      if (m32r_linux_sc_reg_offset[regnum] >= 0)
+	cache->saved_regs[regnum].addr =
+	  sigcontext_addr + m32r_linux_sc_reg_offset[regnum];
+    }
+
+  return cache;
+}
+
+static void
+m32r_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
+				   void **this_cache,
+				   struct frame_id *this_id)
+{
+  struct m32r_frame_cache *cache =
+    m32r_linux_sigtramp_frame_cache (next_frame, this_cache);
+
+  (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+m32r_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
+					 void **this_cache,
+					 int regnum, int *optimizedp,
+					 enum lval_type *lvalp,
+					 CORE_ADDR *addrp,
+					 int *realnump, void *valuep)
+{
+  struct m32r_frame_cache *cache =
+    m32r_linux_sigtramp_frame_cache (next_frame, this_cache);
+
+  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+				optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m32r_linux_sigtramp_frame_unwind = {
+  SIGTRAMP_FRAME,
+  m32r_linux_sigtramp_frame_this_id,
+  m32r_linux_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+m32r_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  char *name;
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+  if (m32r_linux_pc_in_sigtramp (pc, name, next_frame))
+    return &m32r_linux_sigtramp_frame_unwind;
+
+  return NULL;
+}
+
+static void
+m32r_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Since EVB register is not available for native debug, we reduce
+     the number of registers.  */
+  set_gdbarch_num_regs (gdbarch, M32R_NUM_REGS - 1);
+
+  frame_unwind_append_sniffer (gdbarch, m32r_linux_sigtramp_frame_sniffer);
+
+  /* GNU/Linux uses SVR4-style shared libraries.  */
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern void _initialize_m32r_linux_tdep (void);
+
+void
+_initialize_m32r_linux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_m32r, 0, GDB_OSABI_LINUX,
+			  m32r_linux_init_abi);
+}
diff --git a/gdb/m32r-tdep.c b/gdb/m32r-tdep.c
index fd5e9dc836a..73dce73b6c7 100644
--- a/gdb/m32r-tdep.c
+++ b/gdb/m32r-tdep.c
@@ -41,27 +41,7 @@
 
 #include "gdb_assert.h"
 
-struct gdbarch_tdep
-{
-  /* gdbarch target dependent data here. Currently unused for M32R. */
-};
-
-/* m32r register names. */
-
-enum
-{
-  R0_REGNUM = 0,
-  R3_REGNUM = 3,
-  M32R_FP_REGNUM = 13,
-  LR_REGNUM = 14,
-  M32R_SP_REGNUM = 15,
-  PSW_REGNUM = 16,
-  M32R_PC_REGNUM = 21,
-  /* m32r calling convention. */
-  ARG1_REGNUM = R0_REGNUM,
-  ARGN_REGNUM = R3_REGNUM,
-  RET1_REGNUM = R0_REGNUM,
-};
+#include "m32r-tdep.h"
 
 /* Local functions */
 
@@ -238,18 +218,12 @@ char *m32r_register_names[] = {
   "evb"
 };
 
-static int
-m32r_num_regs (void)
-{
-  return (sizeof (m32r_register_names) / sizeof (m32r_register_names[0]));
-}
-
 static const char *
 m32r_register_name (int reg_nr)
 {
   if (reg_nr < 0)
     return NULL;
-  if (reg_nr >= m32r_num_regs ())
+  if (reg_nr >= M32R_NUM_REGS)
     return NULL;
   return m32r_register_names[reg_nr];
 }
@@ -921,7 +895,7 @@ m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_write_pc (gdbarch, m32r_write_pc);
   set_gdbarch_unwind_sp (gdbarch, m32r_unwind_sp);
 
-  set_gdbarch_num_regs (gdbarch, m32r_num_regs ());
+  set_gdbarch_num_regs (gdbarch, M32R_NUM_REGS);
   set_gdbarch_sp_regnum (gdbarch, M32R_SP_REGNUM);
   set_gdbarch_register_name (gdbarch, m32r_register_name);
   set_gdbarch_register_type (gdbarch, m32r_register_type);
@@ -929,8 +903,10 @@ m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_extract_return_value (gdbarch, m32r_extract_return_value);
   set_gdbarch_push_dummy_call (gdbarch, m32r_push_dummy_call);
   set_gdbarch_store_return_value (gdbarch, m32r_store_return_value);
-  set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m32r_extract_struct_value_address);
-  set_gdbarch_deprecated_use_struct_convention (gdbarch, m32r_use_struct_convention);
+  set_gdbarch_deprecated_extract_struct_value_address (gdbarch,
+						       m32r_extract_struct_value_address);
+  set_gdbarch_deprecated_use_struct_convention (gdbarch,
+						m32r_use_struct_convention);
 
   set_gdbarch_skip_prologue (gdbarch, m32r_skip_prologue);
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
diff --git a/gdb/m32r-tdep.h b/gdb/m32r-tdep.h
new file mode 100644
index 00000000000..60da0d61d5f
--- /dev/null
+++ b/gdb/m32r-tdep.h
@@ -0,0 +1,52 @@
+/* Target-dependent code for Renesas M32R, for GDB.
+ 
+   Copyright 2004 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef M32R_TDEP_H
+#define M32R_TDEP_H
+
+struct gdbarch_tdep
+{
+  /* gdbarch target dependent data here. Currently unused for M32R. */
+};
+
+/* m32r register names. */
+
+enum m32r_regnum
+{
+  R0_REGNUM = 0,
+  R3_REGNUM = 3,
+  M32R_FP_REGNUM = 13,
+  LR_REGNUM = 14,
+  M32R_SP_REGNUM = 15,
+  PSW_REGNUM = 16,
+  CBR_REGNUM = 17,
+  SPU_REGNUM = 18,
+  SPI_REGNUM = 19,
+  M32R_PC_REGNUM = 21,
+  /* m32r calling convention. */
+  ARG1_REGNUM = R0_REGNUM,
+  ARGN_REGNUM = R3_REGNUM,
+  RET1_REGNUM = R0_REGNUM,
+};
+
+#define M32R_NUM_REGS 25
+
+#endif /* m32r-tdep.h */