2004-02-17 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>

	Committed by Jim Blandy  <jimb@redhat.com>.
	* config/s390/nm-linux.h: Update comments.  Do not include "solib.h".
	(KERNEL_U_ADDR, REGISTER_U_ADDR, U_REGS_OFFSET): Remove.
	(FETCH_INFERIOR_REGISTERS): Define.
	* config/s390/s390.mh (NATDEPFILES): Remove core-aout.o and
	core-regset.o.
	* config/s390/s390x.mt: Remove.
	* config/s390/tm-s390.h: Remove.
	* config/s390/tm-linux.h: Do not include "s390/tm-s390.h".
	(TARGET_ELF64): Remove.
	(SKIP_TRAMPOLINE_CODE): Do not undefine.
	* configure.tgt [s390-*-*, s390x-*-*]: Merge into single
	s390*-*-* case; always set gdb_target to s390.
	* regformats/reg-s390.dat: Remove control registers.
	* regformats/reg-s390x.dat: Likewise.
	* s390-tdep.h: New file.
	* s390-nat.c: Do not include <asm/processor.h> or <value.h>.
	Include "inferior.h" and "s390-tdep.h".
	Remove private definition of offsetof.
	(s390_register_u_addr): Remove.
	(regmap_gregset, regmap_fpregset): Define.
	(supply_gregset, fill_gregset): Reimplement.
	(supply_fpregset, fill_fpregset): Likewise.
	(s390_inferior_tid): New function.
	(fetch_regs, store_regs, fetch_fpregs, store_fpregs): Likewise.
	(fetch_inferior_registers, store_inferior_registers): Likewise.
	* s390-tdep.c: Do not define S390_TDEP.  Include "defs.h" instead
	of <defs.h>.  Include "reggroups.h", "regset.h", and "s390-tdep.h".
	Global replace of S390_GP0_REGNUM by S390_R0_REGNUM.
	Global replace of S390_FP0_REGNUM by S390_F0_REGNUM.
	(struct gdbarch_tdep): Define.
	(struct s390_register_info): Define.
	(s390_register_info): New variable.
	(s390_register_name): Reimplement.
	(s390_register_type): New function.
	(s390_register_raw_size, s390x_register_raw_size): Remove.
	(s390_cannot_fetch_register): Remove.
	(s390_register_byte): Remove.
	(s390_register_virtual_type, s390x_register_virtual_type): Remove.
	(s390_dwarf_regmap): New variable.
	(s390_dwarf_reg_to_regnum): New function.
	(s390_stab_reg_to_regnum): Remove.
	(s390_pseudo_register_read, s390_pseudo_register_write): New functions.
	(s390x_pseudo_register_read, s390x_pseudo_register_write): Likewise.
	(s390_convert_register_p): Likewise.
	(s390_register_to_value, s390_value_to_register): Likewise.
	(s390_register_reggroup_p): Likewise.
	(s390_regmap_gregset, s390x_regmap_gregset, s390_regmap_fpregset,
	s390_gregset, s390x_gregset, s390_fpregset): New variables.
	(s390_supply_regset, s390_regset_from_core_section): New functions.
	(GDB_TARGET_IS_ESAME): Move here from tm-s390.h.
	(S390_FPR_SIZE): Likewise.
	(S390_GPR_SIZE): Likewise.  Redefine in terms of GDB_TARGET_IS_ESAME.
	Global replace of DEPRECATED_REGISTER_SIZE by S390_GPR_SIZE.
	(S390_NUM_GPRS): Move here from tm-s390.h.
	(S390_NUM_FPRS): Likewise.
	(s390_in_function_epilogue_p): New function.
	(s390_is_sigreturn): Replace S390_PSW_ADDR_SIZE by S390_GPR_SIZE.
	Replace S390_PC_REGNUM by S390_PSWA_REGNUM.
	(s390_gdbarch_init): Allocate and set up gdbarch_tdep structure.
	Replace s390_stab_reg_to_regnum by s390_dwarf_reg_to_regnum.
	Replace S390_FP_REGNUM by S390_SP_REGNUM.
	Remove calls to:
	set_gdbarch_deprecated_max_register_raw_size,
	set_gdbarch_deprecated_max_register_virtual_size,
	set_gdbarch_deprecated_register_byte,
	set_gdbarch_cannot_fetch_register,
	set_gdbarch_cannot_store_register,
	set_gdbarch_deprecated_register_size,
	set_gdbarch_deprecated_register_raw_size,
	set_gdbarch_deprecated_register_virtual_size,
	set_gdbarch_deprecated_register_virtual_type,
	set_gdbarch_deprecated_register_bytes.
	Add calls to:
	set_gdbarch_num_pseudo_regs,
	set_gdbarch_register_type,
	set_gdbarch_convert_register_p,
	set_gdbarch_register_to_value,
	set_gdbarch_value_to_register,
	set_gdbarch_register_reggroup_p,
	set_gdbarch_regset_from_core_section,
	set_gdbarch_pseudo_register_read,
	set_gdbarch_pseudo_register_write,
	set_gdbarch_in_function_epilogue_p.
	* Makefile.in (s390-nat.o, s390-tdep.o): Update dependencies.
	(s390_tdep_h): New variable.

15 files changed, 934 insertions, 482 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0171e98..c95392b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,92 @@
+2004-02-17  Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
+
+	Committed by Jim Blandy  <jimb@redhat.com>.
+	* config/s390/nm-linux.h: Update comments.  Do not include "solib.h".
+	(KERNEL_U_ADDR, REGISTER_U_ADDR, U_REGS_OFFSET): Remove.
+	(FETCH_INFERIOR_REGISTERS): Define.
+	* config/s390/s390.mh (NATDEPFILES): Remove core-aout.o and 
+	core-regset.o.
+	* config/s390/s390x.mt: Remove.
+	* config/s390/tm-s390.h: Remove.
+	* config/s390/tm-linux.h: Do not include "s390/tm-s390.h".
+	(TARGET_ELF64): Remove.
+	(SKIP_TRAMPOLINE_CODE): Do not undefine.
+	* configure.tgt [s390-*-*, s390x-*-*]: Merge into single
+	s390*-*-* case; always set gdb_target to s390.
+	* regformats/reg-s390.dat: Remove control registers.
+	* regformats/reg-s390x.dat: Likewise.
+	* s390-tdep.h: New file.
+	* s390-nat.c: Do not include <asm/processor.h> or <value.h>. 
+	Include "inferior.h" and "s390-tdep.h".
+	Remove private definition of offsetof.
+	(s390_register_u_addr): Remove.
+	(regmap_gregset, regmap_fpregset): Define.
+	(supply_gregset, fill_gregset): Reimplement.
+	(supply_fpregset, fill_fpregset): Likewise.
+	(s390_inferior_tid): New function.
+	(fetch_regs, store_regs, fetch_fpregs, store_fpregs): Likewise.
+	(fetch_inferior_registers, store_inferior_registers): Likewise.
+	* s390-tdep.c: Do not define S390_TDEP.  Include "defs.h" instead
+	of <defs.h>.  Include "reggroups.h", "regset.h", and "s390-tdep.h".
+	Global replace of S390_GP0_REGNUM by S390_R0_REGNUM.
+	Global replace of S390_FP0_REGNUM by S390_F0_REGNUM.
+	(struct gdbarch_tdep): Define.
+	(struct s390_register_info): Define.
+	(s390_register_info): New variable.
+	(s390_register_name): Reimplement.
+	(s390_register_type): New function.
+	(s390_register_raw_size, s390x_register_raw_size): Remove.
+	(s390_cannot_fetch_register): Remove.
+	(s390_register_byte): Remove.
+	(s390_register_virtual_type, s390x_register_virtual_type): Remove.
+	(s390_dwarf_regmap): New variable.
+	(s390_dwarf_reg_to_regnum): New function.
+	(s390_stab_reg_to_regnum): Remove.
+	(s390_pseudo_register_read, s390_pseudo_register_write): New functions.
+	(s390x_pseudo_register_read, s390x_pseudo_register_write): Likewise.
+	(s390_convert_register_p): Likewise.
+	(s390_register_to_value, s390_value_to_register): Likewise.
+	(s390_register_reggroup_p): Likewise.
+	(s390_regmap_gregset, s390x_regmap_gregset, s390_regmap_fpregset,
+	s390_gregset, s390x_gregset, s390_fpregset): New variables.
+	(s390_supply_regset, s390_regset_from_core_section): New functions.
+	(GDB_TARGET_IS_ESAME): Move here from tm-s390.h.
+	(S390_FPR_SIZE): Likewise.
+	(S390_GPR_SIZE): Likewise.  Redefine in terms of GDB_TARGET_IS_ESAME.
+	Global replace of DEPRECATED_REGISTER_SIZE by S390_GPR_SIZE.
+	(S390_NUM_GPRS): Move here from tm-s390.h.
+	(S390_NUM_FPRS): Likewise.
+	(s390_in_function_epilogue_p): New function.
+	(s390_is_sigreturn): Replace S390_PSW_ADDR_SIZE by S390_GPR_SIZE.
+	Replace S390_PC_REGNUM by S390_PSWA_REGNUM.
+	(s390_gdbarch_init): Allocate and set up gdbarch_tdep structure.
+	Replace s390_stab_reg_to_regnum by s390_dwarf_reg_to_regnum.
+	Replace S390_FP_REGNUM by S390_SP_REGNUM.
+	Remove calls to:
+	set_gdbarch_deprecated_max_register_raw_size,
+	set_gdbarch_deprecated_max_register_virtual_size, 
+	set_gdbarch_deprecated_register_byte, 
+	set_gdbarch_cannot_fetch_register,
+	set_gdbarch_cannot_store_register, 
+	set_gdbarch_deprecated_register_size,
+	set_gdbarch_deprecated_register_raw_size,
+	set_gdbarch_deprecated_register_virtual_size,
+	set_gdbarch_deprecated_register_virtual_type,
+	set_gdbarch_deprecated_register_bytes.
+	Add calls to:
+	set_gdbarch_num_pseudo_regs,
+	set_gdbarch_register_type,
+	set_gdbarch_convert_register_p,
+	set_gdbarch_register_to_value,
+	set_gdbarch_value_to_register,
+	set_gdbarch_register_reggroup_p,
+	set_gdbarch_regset_from_core_section,
+	set_gdbarch_pseudo_register_read,
+	set_gdbarch_pseudo_register_write,
+	set_gdbarch_in_function_epilogue_p.
+	* Makefile.in (s390-nat.o, s390-tdep.o): Update dependencies.
+	(s390_tdep_h): New variable.
+
 2004-02-17  Jim Blandy  <jimb@redhat.com>
 
 	* findvar.c (value_from_register): If the type has no length, just
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 82471f1..ff14106 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -727,6 +727,7 @@ regset_h = regset.h
 remote_fileio_h = remote-fileio.h
 remote_h = remote.h
 remote_utils_h = remote-utils.h $(target_h)
+s390_tdep_h = s390-tdep.h
 scm_lang_h = scm-lang.h $(scm_tags_h)
 scm_tags_h = scm-tags.h
 sentinel_frame_h = sentinel-frame.h
@@ -2175,11 +2176,13 @@ rs6000-tdep.o: rs6000-tdep.c $(defs_h) $(frame_h) $(inferior_h) $(symtab_h) \
 	$(libbfd_h) $(coff_internal_h) $(libcoff_h) $(coff_xcoff_h) \
 	$(libxcoff_h) $(elf_bfd_h) $(solib_svr4_h) $(ppc_tdep_h) \
 	$(gdb_assert_h) $(dis_asm_h)
-s390-nat.o: s390-nat.c $(defs_h) $(tm_h) $(regcache_h)
-s390-tdep.o: s390-tdep.c $(arch_utils_h) $(frame_h) $(inferior_h) \
-	$(symtab_h) $(target_h) $(gdbcore_h) $(gdbcmd_h) $(objfiles_h) \
-	$(tm_h) $(__bfd_bfd_h) $(floatformat_h) $(regcache_h) $(value_h) \
-	$(gdb_assert_h) $(dis_asm_h)
+s390-nat.o: s390-nat.c $(defs_h) $(tm_h) $(regcache_h) $(inferior_h) \
+	$(s390_tdep_h)
+s390-tdep.o: s390-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) $(inferior_h) \
+	$(symtab_h) $(target_h) $(gdbcore_h) $(gdbcmd_h) $(symfile_h) \
+	$(objfiles_h) $(tm_h) $(__bfd_bfd_h) $(floatformat_h) $(regcache_h) \
+	$(reggroups_h) $(regset_h) $(value_h) $(gdb_assert_h) $(dis_asm_h) \
+	$(s390_tdep_h)
 scm-exp.o: scm-exp.c $(defs_h) $(symtab_h) $(gdbtypes_h) $(expression_h) \
 	$(parser_defs_h) $(language_h) $(value_h) $(c_lang_h) $(scm_lang_h) \
 	$(scm_tags_h)
diff --git a/gdb/config/s390/nm-linux.h b/gdb/config/s390/nm-linux.h
index df601de..6931efb 100644
--- a/gdb/config/s390/nm-linux.h
+++ b/gdb/config/s390/nm-linux.h
@@ -1,6 +1,6 @@
 /* Native support for GNU/Linux on S390.
 
-   Copyright 2001, 2002 Free Software Foundation, Inc.
+   Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
 
    Ported by D.J. Barrow for IBM Deutschland Entwicklung GmbH, IBM
    Corporation.  derived from i390-nmlinux.h
@@ -27,30 +27,17 @@
 
 #include "config/nm-linux.h"
 
-/* This is the amount to subtract from u.u_ar0
-   to get the offset in the core file of the register values.  */
-#define KERNEL_U_ADDR 0x0
 
-#define REGISTER_U_ADDR(addr, blockend, regno) \
-	(addr) = s390_register_u_addr((blockend),(regno));
-extern int s390_register_u_addr (int, int);
+/* ptrace access.  */
 
-/* Return sizeof user struct to callers in less machine dependent routines */
+#define PTRACE_ARG3_TYPE long
+#define PTRACE_XFER_TYPE long
+
+#define FETCH_INFERIOR_REGISTERS
 
 #define KERNEL_U_SIZE kernel_u_size()
 extern int kernel_u_size (void);
 
-#define U_REGS_OFFSET 0
-
-
-/* We define this if link.h is available, because with ELF we use SVR4 style
-   shared libraries. */
-
-#ifdef HAVE_LINK_H
-#define SVR4_SHARED_LIBS
-#include "solib.h"		/* Support for shared libraries. */
-#endif
-
 
 /* WATCHPOINT SPECIFIC STUFF */
 
@@ -81,8 +68,4 @@ extern int s390_remove_watchpoint (int pid, CORE_ADDR addr, int len);
 	 ((type) == bp_read_watchpoint) || \
          ((type) == bp_access_watchpoint))
 
-
-/* Needed for s390x */
-#define PTRACE_ARG3_TYPE long
-#define PTRACE_XFER_TYPE long
 #endif /* nm_linux.h */
diff --git a/gdb/config/s390/s390.mh b/gdb/config/s390/s390.mh
index b45fa11..3db7bd9 100644
--- a/gdb/config/s390/s390.mh
+++ b/gdb/config/s390/s390.mh
@@ -1,6 +1,5 @@
 # Host: S390, running Linux
 NAT_FILE= nm-linux.h
 NATDEPFILES= infptrace.o inftarg.o fork-child.o corelow.o s390-nat.o \
-	core-aout.o core-regset.o linux-proc.o gcore.o thread-db.o lin-lwp.o \
-	proc-service.o linux-nat.o
+	linux-proc.o gcore.o thread-db.o lin-lwp.o proc-service.o linux-nat.o
 LOADLIBES = -ldl -rdynamic
diff --git a/gdb/config/s390/s390x.mt b/gdb/config/s390/s390x.mt
deleted file mode 100644
index d0c8262..0000000
--- a/gdb/config/s390/s390x.mt
+++ /dev/null
@@ -1,8 +0,0 @@
-# Target: S390 running Linux
-TM_FILE= tm-linux.h
-TDEPFILES=s390-tdep.o solib.o
-# Post 5.0 tdep-files
-TDEPFILES+=solib-svr4.o solib-legacy.o
-
-# needed for gdbserver.
-MT_CFLAGS= -DCONFIG_ARCH_S390X
diff --git a/gdb/config/s390/tm-linux.h b/gdb/config/s390/tm-linux.h
index 7b406e0..d13d06d 100644
--- a/gdb/config/s390/tm-linux.h
+++ b/gdb/config/s390/tm-linux.h
@@ -1,6 +1,6 @@
 /* Target definitions for GDB for a s390 running GNU/Linux.
 
-   Copyright 2001, 2002 Free Software Foundation, Inc.
+   Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
 
    Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
    for IBM Deutschland Entwicklung GmbH, IBM Corporation.
@@ -25,18 +25,6 @@
 #ifndef TM_LINUX_H
 #define TM_LINUX_H
 
-#undef  TARGET_ELF64
-#define TARGET_ELF64 (gdbarch_tdep (current_gdbarch)->intreg_size==8)
-
 #include "config/tm-linux.h"
 
-/* Zap several macros defined in the above header so that multi-arch
-   can safely re-define them.  The ``correct fix'' involves
-   eliminating either the above include or even this file.  */
-#undef SKIP_TRAMPOLINE_CODE
-
-#include "s390/tm-s390.h"
-
-
-
 #endif /* TM_LINUX_H */
diff --git a/gdb/config/s390/tm-s390.h b/gdb/config/s390/tm-s390.h
deleted file mode 100644
index d36c279..0000000
--- a/gdb/config/s390/tm-s390.h
+++ /dev/null
@@ -1,78 +0,0 @@
-/* Macro definitions for GDB on an S390.
-   Copyright 2001 Free Software Foundation, Inc.
-   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
-   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
-
-   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.  */
-
-#if !defined(TM_S390_H)
-#define TM_S390_H 1
-
-#define S390_NUM_GPRS      (16)
-#define S390_GPR_SIZE      DEPRECATED_REGISTER_SIZE
-#define S390_PSW_MASK_SIZE DEPRECATED_REGISTER_SIZE
-#define S390_PSW_ADDR_SIZE DEPRECATED_REGISTER_SIZE
-#define S390_NUM_FPRS      (16)
-#define S390_FPR_SIZE      (8)
-#define S390_FPC_SIZE      (4)
-#define S390_FPC_PAD_SIZE  (4)	/* gcc insists on aligning the fpregs */
-#define S390_NUM_CRS       (16)
-#define S390_CR_SIZE       DEPRECATED_REGISTER_SIZE
-#define S390_NUM_ACRS      (16)
-#define S390_ACR_SIZE      (4)
-
-#define S390_NUM_REGS      (2+S390_NUM_GPRS+S390_NUM_ACRS+S390_NUM_CRS+1+S390_NUM_FPRS)
-#define S390_FIRST_ACR     (2+S390_NUM_GPRS)
-#define S390_LAST_ACR      (S390_FIRST_ACR+S390_NUM_ACRS-1)
-#define S390_FIRST_CR      (S390_FIRST_ACR+S390_NUM_ACRS)
-#define S390_LAST_CR       (S390_FIRST_CR+S390_NUM_CRS-1)
-
-#define S390_PSWM_REGNUM    0
-#define S390_PC_REGNUM      1
-#define	S390_GP0_REGNUM     2	/* GPR register 0 */
-#define S390_GP_LAST_REGNUM (S390_GP0_REGNUM+S390_NUM_GPRS-1)
-/* Usually return address */
-#define S390_RETADDR_REGNUM (S390_GP0_REGNUM+14)
-/* Contains address of top of stack */
-#define S390_SP_REGNUM      (S390_GP0_REGNUM+15)
-/* needed in findvar.c still */
-#define S390_FP_REGNUM     S390_SP_REGNUM
-#define S390_FRAME_REGNUM  (S390_GP0_REGNUM+11)
-#define S390_FPC_REGNUM    (S390_GP0_REGNUM+S390_NUM_GPRS+S390_NUM_ACRS+S390_NUM_CRS)
-/* FPR (Floating point) register 0 */
-#define S390_FP0_REGNUM    (S390_FPC_REGNUM+1)
-/* Last floating point register */
-#define S390_FPLAST_REGNUM (S390_FP0_REGNUM+S390_NUM_FPRS-1)
-#define S390_LAST_REGNUM   S390_FPLAST_REGNUM
-
-
-#define S390_ACR0_OFFSET ((S390_PSW_MASK_SIZE+S390_PSW_ADDR_SIZE)+(S390_GPR_SIZE*S390_NUM_GPRS))
-#define S390_CR0_OFFSET (S390_ACR0_OFFSET+(S390_ACR_SIZE*S390_NUM_ACRS))
-#define S390_FPC_OFFSET (S390_CR0_OFFSET+(S390_CR_SIZE*S390_NUM_CRS))
-#define S390_FP0_OFFSET (S390_FPC_OFFSET+(S390_FPC_SIZE+S390_FPC_PAD_SIZE))
-#define S390_GPR6_STACK_OFFSET (GDB_TARGET_IS_ESAME ? 48:24)
-
-#define S390_REGISTER_BYTES ((4+4)+(4*S390_NUM_GPRS)+(4*S390_NUM_ACRS)+ \
-(4*S390_NUM_CRS)+(S390_FPC_SIZE+S390_FPC_PAD_SIZE)+(S390_FPR_SIZE*S390_NUM_FPRS))
-
-#define S390X_REGISTER_BYTES ((8+8)+(8*S390_NUM_GPRS)+(4*S390_NUM_ACRS)+ \
-(8*S390_NUM_CRS)+(S390_FPC_SIZE+S390_FPC_PAD_SIZE)+(S390_FPR_SIZE*S390_NUM_FPRS))
-
-#define GDB_TARGET_IS_ESAME (TARGET_ARCHITECTURE->mach == bfd_mach_s390_64)
-
-#endif /* ifndef TM_S390_H */
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 0d159d4..fe1702e 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -168,10 +168,7 @@ rs6000-*-lynxos*)	gdb_target=rs6000lynx ;;
 rs6000-*-aix4*)		gdb_target=aix4 ;;
 rs6000-*-*)		gdb_target=rs6000 ;;
 
-s390-*-*)		gdb_target=s390
-			build_gdbserver=yes
-			;;
-s390x-*-*)		gdb_target=s390x
+s390*-*-*)		gdb_target=s390
 			build_gdbserver=yes
 			;;
 
diff --git a/gdb/gdbserver/linux-s390-low.c b/gdb/gdbserver/linux-s390-low.c
index 9213f68..d1a94fb 100644
--- a/gdb/gdbserver/linux-s390-low.c
+++ b/gdb/gdbserver/linux-s390-low.c
@@ -27,7 +27,7 @@
 
 #include <asm/ptrace.h>
 
-#define s390_num_regs 67
+#define s390_num_regs 51
 
 static int s390_regmap[] = {
   PT_PSWMASK, PT_PSWADDR,
@@ -42,15 +42,9 @@ static int s390_regmap[] = {
   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
 
-  -1, -1, -1, -1,
-  -1, -1, -1, -1,
-  -1, PT_CR_9, PT_CR_10, PT_CR_11,
-  -1, -1, -1, -1,
-  
   PT_FPC,
 
-/* <asm/ptrace.h> defines GPR_SIZE.  */
-#if GPR_SIZE == 4
+#ifndef __s390x__
   PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
   PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
   PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
diff --git a/gdb/regformats/reg-s390.dat b/gdb/regformats/reg-s390.dat
index c533a48..79e07b96 100644
--- a/gdb/regformats/reg-s390.dat
+++ b/gdb/regformats/reg-s390.dat
@@ -34,22 +34,6 @@ expedite:r14,r15,pswa
 32:acr13
 32:acr14
 32:acr15
-32:cr0
-32:cr1
-32:cr2
-32:cr3
-32:cr4
-32:cr5
-32:cr6
-32:cr7
-32:cr8
-32:cr9
-32:cr10
-32:cr11
-32:cr12
-32:cr13
-32:cr14
-32:cr15
 32:fpc
 64:f0
 64:f1
diff --git a/gdb/regformats/reg-s390x.dat b/gdb/regformats/reg-s390x.dat
index 25bef05..2e24f53 100644
--- a/gdb/regformats/reg-s390x.dat
+++ b/gdb/regformats/reg-s390x.dat
@@ -34,22 +34,6 @@ expedite:r14,r15,pswa
 32:acr13
 32:acr14
 32:acr15
-64:cr0
-64:cr1
-64:cr2
-64:cr3
-64:cr4
-64:cr5
-64:cr6
-64:cr7
-64:cr8
-64:cr9
-64:cr10
-64:cr11
-64:cr12
-64:cr13
-64:cr14
-64:cr15
 32:fpc
 64:f0
 64:f1
diff --git a/gdb/s390-nat.c b/gdb/s390-nat.c
index 732cf94..ed6c408 100644
--- a/gdb/s390-nat.c
+++ b/gdb/s390-nat.c
@@ -1,7 +1,9 @@
 /* S390 native-dependent code for GDB, the GNU debugger.
-   Copyright 2001 Free Software Foundation, Inc
+   Copyright 2001, 2003 Free Software Foundation, Inc
+
    Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
    for IBM Deutschland Entwicklung GmbH, IBM Corporation.
+
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify
@@ -22,52 +24,201 @@
 #include "defs.h"
 #include "tm.h"
 #include "regcache.h"
+#include "inferior.h"
+
+#include "s390-tdep.h"
+
 #include <asm/ptrace.h>
 #include <sys/ptrace.h>
-#include <asm/processor.h>
 #include <asm/types.h>
 #include <sys/procfs.h>
 #include <sys/user.h>
-#include <value.h>
 #include <sys/ucontext.h>
-#ifndef offsetof
-#define offsetof(type,member) ((size_t) &((type *)0)->member)
-#endif
 
 
-int
-s390_register_u_addr (int blockend, int regnum)
-{
-  int retval;
-
-  if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM)
-    retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE);
-  else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM)
-    retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE);
-  else if (regnum == S390_FPC_REGNUM)
-    retval = PT_FPC;
-  else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM)
-    retval =
-#if CONFIG_ARCH_S390X
-      PT_FPR0
+/* Map registers to gregset/ptrace offsets.
+   These arrays are defined in s390-tdep.c.  */
+
+#ifdef __s390x__
+#define regmap_gregset s390x_regmap_gregset
 #else
-      PT_FPR0_HI
+#define regmap_gregset s390_regmap_gregset
 #endif
-      + ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE);
-  else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR)
-    retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE);
-  else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11))
-    retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE);
-  else
-    {
-      internal_error (__FILE__, __LINE__,
-                      "s390_register_u_addr invalid regnum regnum=%d",
-                      regnum);
-      retval = 0;
-    }
-  return retval + blockend;
+
+#define regmap_fpregset s390_regmap_fpregset
+
+
+/* Fill GDB's register array with the general-purpose register values
+   in *REGP.  */
+void
+supply_gregset (gregset_t *regp)
+{
+  int i;
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (regmap_gregset[i] != -1)
+      regcache_raw_supply (current_regcache, i, 
+			   (char *)regp + regmap_gregset[i]);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *REGP with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+void
+fill_gregset (gregset_t *regp, int regno)
+{
+  int i;
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (regmap_gregset[i] != -1)
+      if (regno == -1 || regno == i)
+	regcache_raw_collect (current_regcache, i, 
+			      (char *)regp + regmap_gregset[i]);
+}
+
+/* Fill GDB's register array with the floating-point register values
+   in *REGP.  */
+void
+supply_fpregset (fpregset_t *regp)
+{
+  int i;
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (regmap_fpregset[i] != -1)
+      regcache_raw_supply (current_regcache, i,
+			   ((char *)regp) + regmap_fpregset[i]);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *REGP with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+void
+fill_fpregset (fpregset_t *regp, int regno)
+{
+  int i;
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (regmap_fpregset[i] != -1)
+      if (regno == -1 || regno == i)
+        regcache_raw_collect (current_regcache, i, 
+			      ((char *)regp) + regmap_fpregset[i]);
+}
+
+/* Find the TID for the current inferior thread to use with ptrace.  */
+static int
+s390_inferior_tid (void)
+{
+  /* GNU/Linux LWP ID's are process ID's.  */
+  int tid = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_ptid); /* Not a threaded program.  */
+
+  return tid;
+}
+
+/* Fetch all general-purpose registers from process/thread TID and
+   store their values in GDB's register cache.  */
+static void
+fetch_regs (int tid)
+{
+  gregset_t regs;
+  ptrace_area parea;
+
+  parea.len = sizeof (regs);
+  parea.process_addr = (addr_t) &regs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't get registers");
+
+  supply_gregset (&regs);
+}
+
+/* Store all valid general-purpose registers in GDB's register cache
+   into the process/thread specified by TID.  */
+static void
+store_regs (int tid, int regnum)
+{
+  gregset_t regs;
+  ptrace_area parea;
+
+  parea.len = sizeof (regs);
+  parea.process_addr = (addr_t) &regs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't get registers");
+
+  fill_gregset (&regs, regnum);
+
+  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't write registers");
+}
+
+/* Fetch all floating-point registers from process/thread TID and store
+   their values in GDB's register cache.  */
+static void
+fetch_fpregs (int tid)
+{
+  fpregset_t fpregs;
+  ptrace_area parea;
+
+  parea.len = sizeof (fpregs);
+  parea.process_addr = (addr_t) &fpregs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't get floating point status");
+
+  supply_fpregset (&fpregs);
+}
+
+/* Store all valid floating-point registers in GDB's register cache
+   into the process/thread specified by TID.  */
+static void
+store_fpregs (int tid, int regnum)
+{
+  fpregset_t fpregs;
+  ptrace_area parea;
+
+  parea.len = sizeof (fpregs);
+  parea.process_addr = (addr_t) &fpregs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't get floating point status");
+
+  fill_fpregset (&fpregs, regnum);
+
+  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name ("Couldn't write floating point status");
+}
+
+/* Fetch register REGNUM from the child process.  If REGNUM is -1, do
+   this for all registers.  */
+void
+fetch_inferior_registers (int regnum)
+{
+  int tid = s390_inferior_tid ();
+
+  if (regnum == -1 
+      || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
+    fetch_regs (tid);
+
+  if (regnum == -1 
+      || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
+    fetch_fpregs (tid);
+}
+
+/* Store register REGNUM back into the child process.  If REGNUM is
+   -1, do this for all registers.  */
+void
+store_inferior_registers (int regnum)
+{
+  int tid = s390_inferior_tid ();
+
+  if (regnum == -1 
+      || (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
+    store_regs (tid, regnum);
+
+  if (regnum == -1 
+      || (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
+    store_fpregs (tid, regnum);
 }
 
+
 /* watch_areas are required if you put 2 or more watchpoints on the same 
    address or overlapping areas gdb will call us to delete the watchpoint 
    more than once when we try to delete them.
@@ -232,127 +383,3 @@ kernel_u_size (void)
   return sizeof (struct user);
 }
 
-
-#if  (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T))
-void
-supply_gregset (gregset_t * gregsetp)
-{
-  int regi;
-  greg_t *gregp = (greg_t *) gregsetp;
-
-  supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]);
-  supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]);
-  for (regi = 0; regi < S390_NUM_GPRS; regi++)
-    supply_register (S390_GP0_REGNUM + regi,
-		     (char *) &gregp[S390_GP0_REGNUM + regi]);
-
-#if defined (CONFIG_ARCH_S390X)
-  /* On the s390x, each element of gregset_t is 8 bytes long, but
-     each access register is still only 32 bits long.  So they're
-     packed two per element.  It's apparently traditional that
-     gregset_t must be an array, so when the registers it provides
-     have different sizes, something has to get strange
-     somewhere.  */
-  {
-    unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR];
-
-    for (regi = 0; regi < S390_NUM_ACRS; regi++)
-      supply_register (S390_FIRST_ACR + regi, (char *) &acrs[regi]);
-  }
-#else
-  for (regi = 0; regi < S390_NUM_ACRS; regi++)
-    supply_register (S390_FIRST_ACR + regi,
-                     (char *) &gregp[S390_FIRST_ACR + regi]);
-#endif
-
-  /* unfortunately this isn't in gregsetp */
-  for (regi = 0; regi < S390_NUM_CRS; regi++)
-    supply_register (S390_FIRST_CR + regi, NULL);
-}
-
-
-void
-supply_fpregset (fpregset_t * fpregsetp)
-{
-  int regi;
-
-  supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc);
-  for (regi = 0; regi < S390_NUM_FPRS; regi++)
-    supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]);
-
-}
-
-void
-fill_gregset (gregset_t * gregsetp, int regno)
-{
-  int regi;
-  greg_t *gregp = (greg_t *) gregsetp;
-
-  if (regno < 0) 
-    {
-      regcache_collect (S390_PSWM_REGNUM, &gregp[S390_PSWM_REGNUM]);
-      regcache_collect (S390_PC_REGNUM, &gregp[S390_PC_REGNUM]);
-      for (regi = 0; regi < S390_NUM_GPRS; regi++)
-        regcache_collect (S390_GP0_REGNUM + regi,
-			  &gregp[S390_GP0_REGNUM + regi]);
-#if defined (CONFIG_ARCH_S390X)
-      /* See the comments about the access registers in
-         supply_gregset, above.  */
-      {
-        unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR];
-        
-        for (regi = 0; regi < S390_NUM_ACRS; regi++)
-          regcache_collect (S390_FIRST_ACR + regi, &acrs[regi]);
-      }
-#else
-      for (regi = 0; regi < S390_NUM_ACRS; regi++)
-        regcache_collect (S390_FIRST_ACR + regi,
-			  &gregp[S390_FIRST_ACR + regi]);
-#endif
-    }
-  else if (regno >= S390_PSWM_REGNUM && regno < S390_FIRST_ACR)
-    regcache_collect (regno, &gregp[regno]);
-  else if (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR)
-    {
-#if defined (CONFIG_ARCH_S390X)
-      /* See the comments about the access registers in
-         supply_gregset, above.  */
-      unsigned int *acrs = (unsigned int *) &gregp[S390_FIRST_ACR];
-        
-      regcache_collect (regno, &acrs[regno - S390_FIRST_ACR]);
-#else
-      regcache_collect (regno, &gregp[regno]);
-#endif
-    }
-}
-
-/*  Given a pointer to a floating point register set in /proc format
-   (fpregset_t *), update the register specified by REGNO from gdb's idea
-   of the current floating point register set.  If REGNO is -1, update
-   them all. */
-
-void
-fill_fpregset (fpregset_t * fpregsetp, int regno)
-{
-  int regi;
-
-  if (regno < 0) 
-    {
-      regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
-      for (regi = 0; regi < S390_NUM_FPRS; regi++)
-        regcache_collect (S390_FP0_REGNUM + regi, &fpregsetp->fprs[regi]);
-    }
-  else if (regno == S390_FPC_REGNUM)
-    regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
-  else if (regno >= S390_FP0_REGNUM && regno <= S390_FPLAST_REGNUM)
-    regcache_collect (regno, &fpregsetp->fprs[regno - S390_FP0_REGNUM]);
-}
-
-
-#else
-#error "There are a few possibilities here"
-#error "1) You aren't compiling for linux & don't need a core dumps to work."
-#error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h"
-#error "libc files are inconsistent with linux/include/asm-s390/"
-#error "3) you didn't do a completely clean build & delete config.cache."
-#endif
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 2d3f3ad..7b44a68 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -22,8 +22,7 @@
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
    02111-1307, USA.  */
 
-#define S390_TDEP		/* for special macros in tm-s390.h */
-#include <defs.h>
+#include "defs.h"
 #include "arch-utils.h"
 #include "frame.h"
 #include "inferior.h"
@@ -36,53 +35,443 @@
 #include "../bfd/bfd.h"
 #include "floatformat.h"
 #include "regcache.h"
+#include "reggroups.h"
+#include "regset.h"
 #include "value.h"
 #include "gdb_assert.h"
 #include "dis-asm.h"
 
+#include "s390-tdep.h"
 
 
-/* Number of bytes of storage in the actual machine representation
-   for register N.  */
-static int
-s390_register_raw_size (int reg_nr)
+/* The tdep structure.  */
+
+struct gdbarch_tdep
 {
-  if (S390_FP0_REGNUM <= reg_nr
-      && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS)
-    return S390_FPR_SIZE;
-  else
-    return 4;
+  /* Core file register sets.  */
+  const struct regset *gregset;
+  int sizeof_gregset;
+
+  const struct regset *fpregset;
+  int sizeof_fpregset;
+};
+
+
+/* Register information.  */
+
+struct s390_register_info
+{
+  char *name;
+  struct type **type;
+};
+
+static struct s390_register_info s390_register_info[S390_NUM_TOTAL_REGS] = 
+{
+  /* Program Status Word.  */
+  { "pswm", &builtin_type_long },
+  { "pswa", &builtin_type_long },
+
+  /* General Purpose Registers.  */
+  { "r0", &builtin_type_long },
+  { "r1", &builtin_type_long },
+  { "r2", &builtin_type_long },
+  { "r3", &builtin_type_long },
+  { "r4", &builtin_type_long },
+  { "r5", &builtin_type_long },
+  { "r6", &builtin_type_long },
+  { "r7", &builtin_type_long },
+  { "r8", &builtin_type_long },
+  { "r9", &builtin_type_long },
+  { "r10", &builtin_type_long },
+  { "r11", &builtin_type_long },
+  { "r12", &builtin_type_long },
+  { "r13", &builtin_type_long },
+  { "r14", &builtin_type_long },
+  { "r15", &builtin_type_long },
+
+  /* Access Registers.  */
+  { "acr0", &builtin_type_int },
+  { "acr1", &builtin_type_int },
+  { "acr2", &builtin_type_int },
+  { "acr3", &builtin_type_int },
+  { "acr4", &builtin_type_int },
+  { "acr5", &builtin_type_int },
+  { "acr6", &builtin_type_int },
+  { "acr7", &builtin_type_int },
+  { "acr8", &builtin_type_int },
+  { "acr9", &builtin_type_int },
+  { "acr10", &builtin_type_int },
+  { "acr11", &builtin_type_int },
+  { "acr12", &builtin_type_int },
+  { "acr13", &builtin_type_int },
+  { "acr14", &builtin_type_int },
+  { "acr15", &builtin_type_int },
+
+  /* Floating Point Control Word.  */
+  { "fpc", &builtin_type_int },
+
+  /* Floating Point Registers.  */
+  { "f0", &builtin_type_double },
+  { "f1", &builtin_type_double },
+  { "f2", &builtin_type_double },
+  { "f3", &builtin_type_double },
+  { "f4", &builtin_type_double },
+  { "f5", &builtin_type_double },
+  { "f6", &builtin_type_double },
+  { "f7", &builtin_type_double },
+  { "f8", &builtin_type_double },
+  { "f9", &builtin_type_double },
+  { "f10", &builtin_type_double },
+  { "f11", &builtin_type_double },
+  { "f12", &builtin_type_double },
+  { "f13", &builtin_type_double },
+  { "f14", &builtin_type_double },
+  { "f15", &builtin_type_double },
+
+  /* Pseudo registers.  */
+  { "pc", &builtin_type_void_func_ptr },
+  { "cc", &builtin_type_int },
+};
+
+/* Return the name of register REGNUM.  */
+static const char *
+s390_register_name (int regnum)
+{
+  gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+  return s390_register_info[regnum].name;
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+   register REGNUM. */
+static struct type *
+s390_register_type (struct gdbarch *gdbarch, int regnum)
+{
+  gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+  return *s390_register_info[regnum].type;
 }
 
+/* DWARF Register Mapping.  */
+
+static int s390_dwarf_regmap[] =
+{
+  /* General Purpose Registers.  */
+  S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+  S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+  S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+  S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+  /* Floating Point Registers.  */
+  S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
+  S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
+  S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
+  S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
+
+  /* Control Registers (not mapped).  */
+  -1, -1, -1, -1, -1, -1, -1, -1, 
+  -1, -1, -1, -1, -1, -1, -1, -1, 
+
+  /* Access Registers.  */
+  S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
+  S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
+  S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
+  S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
+
+  /* Program Status Word.  */
+  S390_PSWM_REGNUM,
+  S390_PSWA_REGNUM
+};
+
+/* Convert DWARF register number REG to the appropriate register
+   number used by GDB.  */
 static int
-s390x_register_raw_size (int reg_nr)
+s390_dwarf_reg_to_regnum (int reg)
+{
+  int regnum = -1;
+
+  if (reg >= 0 || reg < ARRAY_SIZE (s390_dwarf_regmap))
+    regnum = s390_dwarf_regmap[reg];
+
+  if (regnum == -1)
+    warning ("Unmapped DWARF Register #%d encountered\n", reg);
+
+  return regnum;
+}
+
+/* Pseudo registers - PC and condition code.  */
+
+static void
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+			   int regnum, void *buf)
+{
+  ULONGEST val;
+
+  switch (regnum)
+    {
+    case S390_PC_REGNUM:
+      regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+      store_unsigned_integer (buf, 4, val & 0x7fffffff);
+      break;
+
+    case S390_CC_REGNUM:
+      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+      store_unsigned_integer (buf, 4, (val >> 12) & 3);
+      break;
+
+    default:
+      internal_error (__FILE__, __LINE__, "invalid regnum");
+    }
+}
+
+static void
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+			    int regnum, const void *buf)
 {
-  return (reg_nr == S390_FPC_REGNUM)
-    || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8;
+  ULONGEST val, psw;
+
+  switch (regnum)
+    {
+    case S390_PC_REGNUM:
+      val = extract_unsigned_integer (buf, 4);
+      regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+      psw = (psw & 0x80000000) | (val & 0x7fffffff);
+      regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw);
+      break;
+
+    case S390_CC_REGNUM:
+      val = extract_unsigned_integer (buf, 4);
+      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+      psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+      regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+      break;
+
+    default:
+      internal_error (__FILE__, __LINE__, "invalid regnum");
+    }
 }
 
+static void
+s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+			    int regnum, void *buf)
+{
+  ULONGEST val;
+
+  switch (regnum)
+    {
+    case S390_PC_REGNUM:
+      regcache_raw_read (regcache, S390_PSWA_REGNUM, buf);
+      break;
+
+    case S390_CC_REGNUM:
+      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+      store_unsigned_integer (buf, 4, (val >> 44) & 3);
+      break;
+
+    default:
+      internal_error (__FILE__, __LINE__, "invalid regnum");
+    }
+}
+
+static void
+s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+			     int regnum, const void *buf)
+{
+  ULONGEST val, psw;
+
+  switch (regnum)
+    {
+    case S390_PC_REGNUM:
+      regcache_raw_write (regcache, S390_PSWA_REGNUM, buf);
+      break;
+
+    case S390_CC_REGNUM:
+      val = extract_unsigned_integer (buf, 4);
+      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+      psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+      regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+      break;
+
+    default:
+      internal_error (__FILE__, __LINE__, "invalid regnum");
+    }
+}
+
+/* 'float' values are stored in the upper half of floating-point
+   registers, even though we are otherwise a big-endian platform.  */
+
 static int
-s390_cannot_fetch_register (int regno)
+s390_convert_register_p (int regno, struct type *type)
 {
-  return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) ||
-    (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR);
+  return (regno >= S390_F0_REGNUM && regno <= S390_F15_REGNUM)
+	 && TYPE_LENGTH (type) < 8;
 }
 
+static void
+s390_register_to_value (struct frame_info *frame, int regnum,
+                        struct type *valtype, void *out)
+{
+  char in[8];
+  int len = TYPE_LENGTH (valtype);
+  gdb_assert (len < 8);
+
+  get_frame_register (frame, regnum, in);
+  memcpy (out, in, len);
+}
+
+static void
+s390_value_to_register (struct frame_info *frame, int regnum,
+                        struct type *valtype, const void *in)
+{
+  char out[8];
+  int len = TYPE_LENGTH (valtype);
+  gdb_assert (len < 8);
+
+  memset (out, 0, 8);
+  memcpy (out, in, len);
+  put_frame_register (frame, regnum, out);
+}
+
+/* Register groups.  */
+
 static int
-s390_register_byte (int reg_nr)
-{
-  if (reg_nr <= S390_GP_LAST_REGNUM)
-    return reg_nr * S390_GPR_SIZE;
-  if (reg_nr <= S390_LAST_ACR)
-    return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE);
-  if (reg_nr <= S390_LAST_CR)
-    return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE);
-  if (reg_nr == S390_FPC_REGNUM)
-    return S390_FPC_OFFSET;
-  else
-    return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE);
+s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+			  struct reggroup *group)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Registers displayed via 'info regs'.  */
+  if (group == general_reggroup)
+    return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+	   || regnum == S390_PC_REGNUM
+	   || regnum == S390_CC_REGNUM;
+
+  /* Registers displayed via 'info float'.  */
+  if (group == float_reggroup)
+    return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+	   || regnum == S390_FPC_REGNUM;
+
+  /* Registers that need to be saved/restored in order to
+     push or pop frames.  */
+  if (group == save_reggroup || group == restore_reggroup)
+    return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM;
+
+  return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
+
+/* Core file register sets.  */
+
+int s390_regmap_gregset[S390_NUM_REGS] =
+{
+  /* Program Status Word.  */
+  0x00, 0x04,
+  /* General Purpose Registers.  */
+  0x08, 0x0c, 0x10, 0x14,
+  0x18, 0x1c, 0x20, 0x24,
+  0x28, 0x2c, 0x30, 0x34,
+  0x38, 0x3c, 0x40, 0x44,
+  /* Access Registers.  */
+  0x48, 0x4c, 0x50, 0x54,
+  0x58, 0x5c, 0x60, 0x64,
+  0x68, 0x6c, 0x70, 0x74,
+  0x78, 0x7c, 0x80, 0x84,
+  /* Floating Point Control Word.  */
+  -1,
+  /* Floating Point Registers.  */
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390x_regmap_gregset[S390_NUM_REGS] =
+{
+  0x00, 0x08,
+  /* General Purpose Registers.  */
+  0x10, 0x18, 0x20, 0x28,
+  0x30, 0x38, 0x40, 0x48,
+  0x50, 0x58, 0x60, 0x68,
+  0x70, 0x78, 0x80, 0x88,
+  /* Access Registers.  */
+  0x90, 0x94, 0x98, 0x9c,
+  0xa0, 0xa4, 0xa8, 0xac,
+  0xb0, 0xb4, 0xb8, 0xbc,
+  0xc0, 0xc4, 0xc8, 0xcc,
+  /* Floating Point Control Word.  */
+  -1,
+  /* Floating Point Registers.  */
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390_regmap_fpregset[S390_NUM_REGS] =
+{
+  /* Program Status Word.  */
+  -1, -1,
+  /* General Purpose Registers.  */
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  /* Access Registers.  */
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  /* Floating Point Control Word.  */
+  0x00,
+  /* Floating Point Registers.  */
+  0x08, 0x10, 0x18, 0x20,
+  0x28, 0x30, 0x38, 0x40,
+  0x48, 0x50, 0x58, 0x60,
+  0x68, 0x70, 0x78, 0x80,
+};
+
+/* Supply register REGNUM from the register set REGSET to register cache 
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+static void
+s390_supply_regset (const struct regset *regset, struct regcache *regcache,
+		    int regnum, const void *regs, size_t len)
+{
+  const int *offset = regset->descr;
+  int i;
+
+  for (i = 0; i < S390_NUM_REGS; i++)
+    {
+      if ((regnum == i || regnum == -1) && offset[i] != -1)
+	regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);
+    }
+}
+
+static const struct regset s390_gregset = {
+  s390_regmap_gregset, 
+  s390_supply_regset
+};
+
+static const struct regset s390x_gregset = {
+  s390x_regmap_gregset, 
+  s390_supply_regset
+};
+
+static const struct regset s390_fpregset = {
+  s390_regmap_fpregset, 
+  s390_supply_regset
+};
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+const struct regset *
+s390_regset_from_core_section (struct gdbarch *gdbarch,
+			       const char *sect_name, size_t sect_size)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset)
+    return tdep->gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
+    return tdep->fpregset;
+
+  return NULL;
 }
 
+
+#define GDB_TARGET_IS_ESAME (TARGET_ARCHITECTURE->mach == bfd_mach_s390_64)
+#define S390_GPR_SIZE      (GDB_TARGET_IS_ESAME ? 8 : 4)
+#define S390_FPR_SIZE      (8)
 #define S390_MAX_INSTR_SIZE (6)
 #define S390_SYSCALL_OPCODE (0x0a)
 #define S390_SYSCALL_SIZE   (2)
@@ -92,8 +481,8 @@ s390_register_byte (int reg_nr)
 #define S390X_SIGREGS_FP0_OFFSET      (216)
 #define S390_UC_MCONTEXT_OFFSET    (256)
 #define S390X_UC_MCONTEXT_OFFSET   (344)
-#define S390_STACK_FRAME_OVERHEAD  16*DEPRECATED_REGISTER_SIZE+32
-#define S390_STACK_PARAMETER_ALIGNMENT  DEPRECATED_REGISTER_SIZE
+#define S390_STACK_FRAME_OVERHEAD  16*S390_GPR_SIZE+32
+#define S390_STACK_PARAMETER_ALIGNMENT  S390_GPR_SIZE
 #define S390_NUM_FP_PARAMETER_REGISTERS (GDB_TARGET_IS_ESAME ? 4:2)
 #define S390_SIGNAL_FRAMESIZE  (GDB_TARGET_IS_ESAME ? 160:96)
 #define s390_NR_sigreturn          119
@@ -149,44 +538,6 @@ s390_memset_extra_info (struct frame_extra_info *fextra_info)
 }
 
 
-
-static const char *
-s390_register_name (int reg_nr)
-{
-  static char *register_names[] = {
-    "pswm", "pswa",
-    "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
-    "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
-    "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
-    "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
-    "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
-    "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
-    "fpc",
-    "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
-    "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
-  };
-
-  if (reg_nr <= S390_LAST_REGNUM)
-    return register_names[reg_nr];
-  else
-    return NULL;
-}
-
-
-
-
-static int
-s390_stab_reg_to_regnum (int regno)
-{
-  return regno >= 64 ? S390_PSWM_REGNUM - 64 :
-    regno >= 48 ? S390_FIRST_ACR - 48 :
-    regno >= 32 ? S390_FIRST_CR - 32 :
-    regno <= 15 ? (regno + 2) :
-    S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) +
-    (((regno - 16) & 4) >> 2);
-}
-
-
 /* Prologue analysis.  */
 
 /* When we analyze a prologue, we're really doing 'abstract
@@ -598,6 +949,8 @@ enum
     op1_stg  = 0xe3,   op2_stg  = 0x24,
     op_stm   = 0x90,
     op1_stmg = 0xeb,   op2_stmg = 0x24,
+    op_lm    = 0x98,
+    op1_lmg  = 0xeb,   op2_lmg  = 0x04,
     op_svc   = 0x0a,
   };
 
@@ -786,6 +1139,8 @@ compute_x_addr (struct prologue_value *addr,
    track general-purpose registers r2 -- r15, and floating-point
    registers f0, f2, f4, and f6.  */
 #define S390_NUM_SPILL_SLOTS (14 + 4)
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
 
 
 /* If the SIZE bytes at ADDR are a stack slot we're actually tracking,
@@ -819,7 +1174,7 @@ s390_on_stack (struct prologue_value *addr,
   /* Construct the addresses of the spill arrays and the back chain.  */
   pv_set_to_register (&gpr_spill_addr, S390_SP_REGNUM, 2 * S390_GPR_SIZE);
   pv_set_to_register (&fpr_spill_addr, S390_SP_REGNUM, 16 * S390_GPR_SIZE);
-  back_chain_addr = gpr[S390_SP_REGNUM - S390_GP0_REGNUM];
+  back_chain_addr = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
 
   /* We have to check for GPR and FPR references using two separate
      calls to pv_is_array_ref, since the GPR and FPR spill slots are
@@ -902,12 +1257,12 @@ s390_get_signal_frame_info (struct frame_info *fi)
       /* We're definitely backtracing from a signal handler.  */
       CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi);
       CORE_ADDR save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext
-                                 + DEPRECATED_REGISTER_BYTE (S390_GP0_REGNUM));
+                                 + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM));
       int reg;
 
       for (reg = 0; reg < S390_NUM_GPRS; reg++)
         {
-          saved_regs[S390_GP0_REGNUM + reg] = save_reg_addr;
+          saved_regs[S390_R0_REGNUM + reg] = save_reg_addr;
           save_reg_addr += S390_GPR_SIZE;
         }
 
@@ -916,7 +1271,7 @@ s390_get_signal_frame_info (struct frame_info *fi)
                           S390_SIGREGS_FP0_OFFSET));
       for (reg = 0; reg < S390_NUM_FPRS; reg++)
         {
-          saved_regs[S390_FP0_REGNUM + reg] = save_reg_addr;
+          saved_regs[S390_F0_REGNUM + reg] = save_reg_addr;
           save_reg_addr += S390_FPR_SIZE;
         }
     }
@@ -966,10 +1321,10 @@ s390_get_frame_info (CORE_ADDR start_pc,
     int i;
 
     for (i = 0; i < S390_NUM_GPRS; i++)
-      pv_set_to_register (&gpr[i], S390_GP0_REGNUM + i, 0);
+      pv_set_to_register (&gpr[i], S390_R0_REGNUM + i, 0);
 
     for (i = 0; i < S390_NUM_FPRS; i++)
-      pv_set_to_register (&fpr[i], S390_FP0_REGNUM + i, 0);
+      pv_set_to_register (&fpr[i], S390_F0_REGNUM + i, 0);
 
     for (i = 0; i < S390_NUM_SPILL_SLOTS; i++)
       pv_set_to_unknown (&spill[i]);
@@ -1003,8 +1358,8 @@ s390_get_frame_info (CORE_ADDR start_pc,
 
       next_pc = pc + insn_len;
 
-      pre_insn_sp = gpr[S390_SP_REGNUM - S390_GP0_REGNUM];
-      pre_insn_fp = gpr[S390_FRAME_REGNUM - S390_GP0_REGNUM];
+      pre_insn_sp = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+      pre_insn_fp = gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
       pre_insn_back_chain = back_chain;
 
       /* A special case, first --- only recognized as the very first
@@ -1286,8 +1641,8 @@ s390_get_frame_info (CORE_ADDR start_pc,
          restore instructions.  (The back chain is never restored,
          just popped.)  */
       {
-        struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_GP0_REGNUM];
-        struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_GP0_REGNUM];
+        struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+        struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
         
         if ((! pv_is_identical (&pre_insn_sp, sp)
              && ! pv_is_register (sp, S390_SP_REGNUM, 0))
@@ -1317,7 +1672,7 @@ s390_get_frame_info (CORE_ADDR start_pc,
        that strongly suggests that we're going to use that as our
        frame pointer register, not the SP.  */
     {
-      struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_GP0_REGNUM];
+      struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
 
       if (fp->kind == pv_register
           && fp->reg == S390_SP_REGNUM)
@@ -1348,7 +1703,7 @@ s390_get_frame_info (CORE_ADDR start_pc,
         else
           frame_base_regno = S390_SP_REGNUM;
 
-        frame_base = &gpr[frame_base_regno - S390_GP0_REGNUM];
+        frame_base = &gpr[frame_base_regno - S390_R0_REGNUM];
 
         /* We know the frame base address; if the value of whatever
            register it came from is a constant offset from the
@@ -1362,7 +1717,7 @@ s390_get_frame_info (CORE_ADDR start_pc,
     /* If the analysis said that the current SP value is the original
        value less some constant, then that constant is the frame size.  */
     {
-      struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_GP0_REGNUM];
+      struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
 
       if (sp->kind == pv_register
           && sp->reg == S390_SP_REGNUM)
@@ -1475,6 +1830,50 @@ s390_get_frame_info (CORE_ADDR start_pc,
   return result;
 }
 
+/* Return true if we are in the functin's epilogue, i.e. after the
+   instruction that destroyed the function's stack frame.  */
+static int
+s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+  /* In frameless functions, there's not frame to destroy and thus
+     we don't care about the epilogue.
+
+     In functions with frame, the epilogue sequence is a pair of
+     a LM-type instruction that restores (amongst others) the
+     return register %r14 and the stack pointer %r15, followed
+     by a branch 'br %r14' --or equivalent-- that effects the
+     actual return.
+
+     In that situation, this function needs to return 'true' in
+     exactly one case: when pc points to that branch instruction.
+
+     Thus we try to disassemble the one instructions immediately
+     preceeding pc and check whether it is an LM-type instruction
+     modifying the stack pointer.
+
+     Note that disassembling backwards is not reliable, so there
+     is a slight chance of false positives here ...  */
+
+  bfd_byte insn[6];
+  unsigned int r1, r3, b2;
+  int d2;
+
+  if (word_size == 4
+      && !read_memory_nobpt (pc - 4, insn, 4)
+      && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
+      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+    return 1;
+
+  if (word_size == 8
+      && !read_memory_nobpt (pc - 6, insn, 6)
+      && is_rse (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+    return 1;
+
+  return 0;
+}
 
 static int
 s390_check_function_end (CORE_ADDR pc)
@@ -1645,8 +2044,8 @@ s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi,
 	      *sigcaller_pc =
 		ADDR_BITS_REMOVE ((CORE_ADDR)
 				  read_memory_integer (temp_sregs +
-						       DEPRECATED_REGISTER_BYTE (S390_PC_REGNUM),
-						       S390_PSW_ADDR_SIZE));
+						       DEPRECATED_REGISTER_BYTE (S390_PSWA_REGNUM),
+						       S390_GPR_SIZE));
 	    }
 	}
       retval = 1;
@@ -1815,7 +2214,7 @@ s390_frame_chain (struct frame_info *thisframe)
 	{
 	  /* read sigregs,regs.gprs[11 or 15] */
 	  prev_fp = read_memory_integer (sregs +
-					 DEPRECATED_REGISTER_BYTE (S390_GP0_REGNUM +
+					 DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM +
 							(prev_fextra_info.
 							 frame_pointer_saved_pc
 							 ? 11 : 15)),
@@ -1877,7 +2276,7 @@ s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
   int len = TYPE_LENGTH (valtype);
 
   if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
-    memcpy (valbuf, &regbuf[DEPRECATED_REGISTER_BYTE (S390_FP0_REGNUM)], len);
+    memcpy (valbuf, &regbuf[DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM)], len);
   else
     {
       int offset = 0;
@@ -1885,7 +2284,7 @@ s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
       if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
 	offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
       memcpy (valbuf,
-	      regbuf + DEPRECATED_REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset,
+	      regbuf + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM + 2) + offset,
 	      TYPE_LENGTH (valtype));
     }
 }
@@ -1930,13 +2329,13 @@ static void
 s390_store_return_value (struct type *valtype, char *valbuf)
 {
   int arglen;
-  char *reg_buff = alloca (max (S390_FPR_SIZE, DEPRECATED_REGISTER_SIZE)), *value;
+  char *reg_buff = alloca (max (S390_FPR_SIZE, S390_GPR_SIZE)), *value;
 
   if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
     {
       if (TYPE_LENGTH (valtype) == 4
           || TYPE_LENGTH (valtype) == 8)
-        deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_FP0_REGNUM),
+        deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM),
 					 valbuf, TYPE_LENGTH (valtype));
       else
         error ("GDB is unable to return `long double' values "
@@ -1947,7 +2346,7 @@ s390_store_return_value (struct type *valtype, char *valbuf)
       value =
 	s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
       /* Everything else is returned in GPR2 and up. */
-      deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_GP0_REGNUM + 2),
+      deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM + 2),
 				       value, arglen);
     }
 }
@@ -2154,7 +2553,7 @@ is_simple_arg (struct type *type)
 
   /* This is almost a direct translation of the ABI's language, except
      that we have to exclude 8-byte structs; those are DOUBLE_ARGs.  */
-  return ((is_integer_like (type) && length <= DEPRECATED_REGISTER_SIZE)
+  return ((is_integer_like (type) && length <= S390_GPR_SIZE)
           || is_pointer_like (type)
           || (is_struct_like (type) && !is_double_arg (type)));
 }
@@ -2175,7 +2574,7 @@ pass_by_copy_ref (struct type *type)
   unsigned length = TYPE_LENGTH (type);
 
   return (is_struct_like (type)
-          && !(is_power_of_two (length) && length <= DEPRECATED_REGISTER_SIZE));
+          && !(is_power_of_two (length) && length <= S390_GPR_SIZE));
 }
 
 
@@ -2295,9 +2694,9 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
         
         sp = align_down (sp, alignment_of (type));
 
-        /* SIMPLE_ARG values get extended to DEPRECATED_REGISTER_SIZE bytes. 
+        /* SIMPLE_ARG values get extended to S390_GPR_SIZE bytes. 
            Assume every argument is.  */
-        if (length < DEPRECATED_REGISTER_SIZE) length = DEPRECATED_REGISTER_SIZE;
+        if (length < S390_GPR_SIZE) length = S390_GPR_SIZE;
         sp -= length;
       }
   }
@@ -2332,7 +2731,7 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
           {
             /* When we store a single-precision value in an FP register,
                it occupies the leftmost bits.  */
-            deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_FP0_REGNUM + fr),
+            deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM + fr),
 					     VALUE_CONTENTS (arg),
 					     TYPE_LENGTH (type));
             fr += 2;
@@ -2343,19 +2742,19 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
             /* Do we need to pass a pointer to our copy of this
                argument?  */
             if (pass_by_copy_ref (type))
-              write_register (S390_GP0_REGNUM + gr, copy_addr[i]);
+              write_register (S390_R0_REGNUM + gr, copy_addr[i]);
             else
-              write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg));
+              write_register (S390_R0_REGNUM + gr, extend_simple_arg (arg));
 
             gr++;
           }
         else if (is_double_arg (type)
                  && gr <= 5)
           {
-            deprecated_write_register_gen (S390_GP0_REGNUM + gr,
+            deprecated_write_register_gen (S390_R0_REGNUM + gr,
 					   VALUE_CONTENTS (arg));
-            deprecated_write_register_gen (S390_GP0_REGNUM + gr + 1,
-					   VALUE_CONTENTS (arg) + DEPRECATED_REGISTER_SIZE);
+            deprecated_write_register_gen (S390_R0_REGNUM + gr + 1,
+					   VALUE_CONTENTS (arg) + S390_GPR_SIZE);
             gr += 2;
           }
         else
@@ -2372,8 +2771,8 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
             if (is_simple_arg (type))
               {
                 /* Simple args are always extended to 
-                   DEPRECATED_REGISTER_SIZE bytes.  */
-                starg = align_up (starg, DEPRECATED_REGISTER_SIZE);
+                   S390_GPR_SIZE bytes.  */
+                starg = align_up (starg, S390_GPR_SIZE);
 
                 /* Do we need to pass a pointer to our copy of this
                    argument?  */
@@ -2382,10 +2781,10 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
                                                copy_addr[i]);
                 else
                   /* Simple args are always extended to 
-                     DEPRECATED_REGISTER_SIZE bytes. */
-                  write_memory_signed_integer (starg, DEPRECATED_REGISTER_SIZE,
+                     S390_GPR_SIZE bytes. */
+                  write_memory_signed_integer (starg, S390_GPR_SIZE,
                                                extend_simple_arg (arg));
-                starg += DEPRECATED_REGISTER_SIZE;
+                starg += S390_GPR_SIZE;
               }
             else
               {
@@ -2434,33 +2833,10 @@ s390_use_struct_convention (int gcc_p, struct type *value_type)
           || code == TYPE_CODE_UNION);
 }
 
-
-/* Return the GDB type object for the "standard" data type
-   of data in register N.  */
-static struct type *
-s390_register_virtual_type (int regno)
-{
-  if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS)
-    return builtin_type_double;
-  else
-    return builtin_type_int;
-}
-
-
-static struct type *
-s390x_register_virtual_type (int regno)
-{
-  return (regno == S390_FPC_REGNUM) ||
-    (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int :
-    (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long;
-}
-
-
-
 static void
 s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
 {
-  write_register (S390_GP0_REGNUM + 2, addr);
+  write_register (S390_R0_REGNUM + 2, addr);
 }
 
 
@@ -2558,7 +2934,8 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
     return NULL;		/* No; then it's not for us.  */
 
   /* Yes: create a new gdbarch for the specified machine type.  */
-  gdbarch = gdbarch_alloc (&info, NULL);
+  tdep = XCALLOC (1, struct gdbarch_tdep);
+  gdbarch = gdbarch_alloc (&info, tdep);
 
   /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
      ready to unwind the PC first (see frame.c:get_prev_frame()).  */
@@ -2579,13 +2956,12 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame);
   /* Stack grows downward.  */
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
-  set_gdbarch_deprecated_max_register_raw_size (gdbarch, 8);
-  set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 8);
   set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
   set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
   set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
   set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
   set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp);
+  set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
   /* This function that tells us whether the function invocation represented
      by FI does not have a frame on the stack associated with it.  If it
      does not, FRAMELESS is set to 1, else 0.  */
@@ -2596,19 +2972,24 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
      produces the frame's chain-pointer. */
   set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
   set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
-  set_gdbarch_deprecated_register_byte (gdbarch, s390_register_byte);
   set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
   set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
-  set_gdbarch_deprecated_fp_regnum (gdbarch, S390_FP_REGNUM);
-  set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM);
+  set_gdbarch_deprecated_fp_regnum (gdbarch, S390_SP_REGNUM);
+  set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
   set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
-  set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register);
-  set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register);
+  set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS);
   set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
   set_gdbarch_register_name (gdbarch, s390_register_name);
-  set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
-  set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
-  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
+  set_gdbarch_register_type (gdbarch, s390_register_type);
+  set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+  set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+  set_gdbarch_convert_register_p (gdbarch, s390_convert_register_p);
+  set_gdbarch_register_to_value (gdbarch, s390_register_to_value);
+  set_gdbarch_value_to_register (gdbarch, s390_value_to_register);
+  set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p);
+  set_gdbarch_regset_from_core_section (gdbarch,
+                                        s390_regset_from_core_section);
   set_gdbarch_deprecated_extract_struct_value_address (gdbarch, s390_cannot_extract_struct_value_address);
 
   /* Parameters for inferior function calls.  */
@@ -2624,24 +3005,26 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   switch (info.bfd_arch_info->mach)
     {
     case bfd_mach_s390_31:
-      set_gdbarch_deprecated_register_size (gdbarch, 4);
-      set_gdbarch_deprecated_register_raw_size (gdbarch, s390_register_raw_size);
-      set_gdbarch_deprecated_register_virtual_size (gdbarch, s390_register_raw_size);
-      set_gdbarch_deprecated_register_virtual_type (gdbarch, s390_register_virtual_type);
+      tdep->gregset = &s390_gregset;
+      tdep->sizeof_gregset = s390_sizeof_gregset;
+      tdep->fpregset = &s390_fpregset;
+      tdep->sizeof_fpregset = s390_sizeof_fpregset;
 
       set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
-      set_gdbarch_deprecated_register_bytes (gdbarch, S390_REGISTER_BYTES);
+      set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+      set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
       break;
     case bfd_mach_s390_64:
-      set_gdbarch_deprecated_register_size (gdbarch, 8);
-      set_gdbarch_deprecated_register_raw_size (gdbarch, s390x_register_raw_size);
-      set_gdbarch_deprecated_register_virtual_size (gdbarch, s390x_register_raw_size);
-      set_gdbarch_deprecated_register_virtual_type (gdbarch, s390x_register_virtual_type);
+      tdep->gregset = &s390x_gregset;
+      tdep->sizeof_gregset = s390x_sizeof_gregset;
+      tdep->fpregset = &s390_fpregset;
+      tdep->sizeof_fpregset = s390_sizeof_fpregset;
 
       set_gdbarch_long_bit (gdbarch, 64);
       set_gdbarch_long_long_bit (gdbarch, 64);
       set_gdbarch_ptr_bit (gdbarch, 64);
-      set_gdbarch_deprecated_register_bytes (gdbarch, S390X_REGISTER_BYTES);
+      set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read);
+      set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write);
       set_gdbarch_address_class_type_flags (gdbarch,
                                             s390_address_class_type_flags);
       set_gdbarch_address_class_type_flags_to_name (gdbarch,
diff --git a/gdb/s390-tdep.h b/gdb/s390-tdep.h
new file mode 100644
index 0000000..241c1fe
--- /dev/null
+++ b/gdb/s390-tdep.h
@@ -0,0 +1,105 @@
+/* Target-dependent code for GDB, the GNU debugger.
+   Copyright 2003 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 S390_TDEP_H
+#define S390_TDEP_H
+
+/* Register information.  */
+
+/* Program Status Word.  */
+#define S390_PSWM_REGNUM 0
+#define S390_PSWA_REGNUM 1
+/* General Purpose Registers.  */
+#define S390_R0_REGNUM 2
+#define S390_R1_REGNUM 3
+#define S390_R2_REGNUM 4
+#define S390_R3_REGNUM 5
+#define S390_R4_REGNUM 6
+#define S390_R5_REGNUM 7
+#define S390_R6_REGNUM 8
+#define S390_R7_REGNUM 9
+#define S390_R8_REGNUM 10
+#define S390_R9_REGNUM 11
+#define S390_R10_REGNUM 12
+#define S390_R11_REGNUM 13
+#define S390_R12_REGNUM 14
+#define S390_R13_REGNUM 15
+#define S390_R14_REGNUM 16
+#define S390_R15_REGNUM 17
+/* Access Registers.  */
+#define S390_A0_REGNUM 18
+#define S390_A1_REGNUM 19
+#define S390_A2_REGNUM 20
+#define S390_A3_REGNUM 21
+#define S390_A4_REGNUM 22
+#define S390_A5_REGNUM 23
+#define S390_A6_REGNUM 24
+#define S390_A7_REGNUM 25
+#define S390_A8_REGNUM 26
+#define S390_A9_REGNUM 27
+#define S390_A10_REGNUM 28
+#define S390_A11_REGNUM 29
+#define S390_A12_REGNUM 30
+#define S390_A13_REGNUM 31
+#define S390_A14_REGNUM 32
+#define S390_A15_REGNUM 33
+/* Floating Point Control Word.  */
+#define S390_FPC_REGNUM 34
+/* Floating Point Registers.  */
+#define S390_F0_REGNUM 35
+#define S390_F1_REGNUM 36
+#define S390_F2_REGNUM 37
+#define S390_F3_REGNUM 38
+#define S390_F4_REGNUM 39
+#define S390_F5_REGNUM 40
+#define S390_F6_REGNUM 41
+#define S390_F7_REGNUM 42
+#define S390_F8_REGNUM 43
+#define S390_F9_REGNUM 44
+#define S390_F10_REGNUM 45
+#define S390_F11_REGNUM 46
+#define S390_F12_REGNUM 47
+#define S390_F13_REGNUM 48
+#define S390_F14_REGNUM 49
+#define S390_F15_REGNUM 50
+/* Total.  */
+#define S390_NUM_REGS 51
+
+/* Pseudo registers -- PC and condition code.  */
+#define S390_PC_REGNUM S390_NUM_REGS
+#define S390_CC_REGNUM (S390_NUM_REGS+1)
+#define S390_NUM_PSEUDO_REGS 2
+#define S390_NUM_TOTAL_REGS (S390_NUM_REGS+2)
+
+/* Special register usage.  */
+#define S390_SP_REGNUM S390_R15_REGNUM
+#define S390_RETADDR_REGNUM S390_R14_REGNUM
+#define S390_FRAME_REGNUM S390_R11_REGNUM
+
+/* Core file register sets, defined in s390-tdep.c.  */
+#define s390_sizeof_gregset 0x90
+extern int s390_regmap_gregset[S390_NUM_REGS];
+#define s390x_sizeof_gregset 0xd8
+extern int s390x_regmap_gregset[S390_NUM_REGS];
+#define s390_sizeof_fpregset 0x88
+extern int s390_regmap_fpregset[S390_NUM_REGS];
+
+#endif
+
diff --git a/gdb/testsuite/gdb.base/float.exp b/gdb/testsuite/gdb.base/float.exp
index 6c80fbb..01b0a99 100644
--- a/gdb/testsuite/gdb.base/float.exp
+++ b/gdb/testsuite/gdb.base/float.exp
@@ -63,6 +63,8 @@ if { [istarget "alpha*-*-*"] } then {
     gdb_test "info float" "f0.*f1.*f127.*" "info float"
 } elseif [istarget "m68k-*-*"] then {
     gdb_test "info float" "fp0.*fp1.*fp7.*" "info float"
+} elseif [istarget "s390*-*-*"] then {
+    gdb_test "info float" "fpc.*f0.*f1.*f15.*" "info float"
 } elseif [istarget "sh*-*"] then {
     # SH may or may not have an FPU
     gdb_test_multiple "info float" "info float" {