Make GNU/Linux/PPC work again.

gdb/ChangeLog

@@ -1,3 +1,55 @@
+2000-07-31  Kevin Buettner  <kevinb@redhat.com>
+
+	* ppc-tdep.h: New file.
+	* Makefile.in (ppc-linux-tdep.o, rs6000-tdep.o): Add ppc-tdep.h
+	as a dependency.
+	* ppc-linux-tdep.c, rs6000-tdep.c (ppc-tdep.h): Include.
+
+	* ppc-linux-tdep.c (ppc_linux_at_sigtramp_return_path): Made static.
+
+	* rs6000-tdep.c (elf-bfd.h): Include.
+	(gdbarch_tdep): Add field osabi to this struct.
+	(rs6000_init_extra_frame_info, rs6000_frame_init_saved_regs,
+	rs6000_frameless_function_invocation, rs6000_frame_saved_pc,
+	rs6000_frame_chain): No longer static.
+	(process_note_abi_tag_sections, get_elfosabi): New static
+	functions.
+	(rs6000_gdbarch_init): Revised to accomodate ELF executables;
+	also use Linux specific methods when the target is Linux.
+
+	* config/powerpc/aix.mt, config/powerpc/cygwin.mt,
+	config/powerpc/macos.mt, config/powerpc/nbsd.mt,
+	config/powerpc/ppc-eabi.mt, config/powerpc/ppc-nw.mt,
+	config/powerpc/ppc-sim.mt, config/powerpc/ppcle-eabi.mt,
+	config/powerpc/ppcle-sim.mt, config/powerpc/solaris.mt,
+	config/powerpc/vxworks.mt, config/rs6000/aix4.mt,
+	config/rs6000/rs6000.mt, config/rs6000/rs6000lynx.mt
+	(TDEPFILES): Add ppc-linux-tdep.o.
+
+	* config/tm-linux.h (SIGCONTEXT_PC_OFFSET, FRAME_SAVED_PC,
+	INIT_EXTRA_FRAME_INFO, FRAMELESS_FUNCTION_INVOCATION,
+	FRAME_INIT_SAVED_REGS, FRAME_CHAIN, PUSH_ARGUMENTS,
+	MEMORY_REMOVE_BREAKPOINT: Removed defines.
+	(ppc_linux_frame_saved_pc, ppc_linux_init_extra_frame_info,
+	ppc_linux_frameless_function_invocation,
+	ppc_linux_frame_init_saved_regs, ppc_linux_frame_chain,
+	ppc_sysv_abi_push_arguments, ppc_linux_memory_remove_breakpoint):
+	Removed declarations.
+	(CANNOT_FETCH_REGISTER, CANNOT_STORE_REGISTER): Disabled.
+
+	* dink32-rom.c (dink32_regnames): Make array size implicit.
+
+	* ppc-bdm.h (ppc-tdep.h): Include.
+
+	* rs6000-tdep.c, ppc-linux-tdep.c, ppc-bdm.h, ppc-tdep.h
+	(GP0_REGNUM, TOC_REGNUM, PS_REGNUM, CR_REGNUM, LR_REGNUM,
+	CTR_REGNUM, XER_REGNUM, MQ_REGNUM): Add PPC_ prefix.
+
+	From Nick Duffek:
+	* ppc-tdep.h (ppc_linux_frame_saved_pc, rs6000_frame_saved_pc):
+	Change return type to CORE_ADDR.
+	* ppc-linux-tdep.c (ppc_linux_frame_saved_pc): Likewise.
+
 2000-07-31  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
 
 	* remote-e7000.c (e7000_start_remote): Use void *, not char * as

gdb/Makefile.in

@@ -1627,7 +1627,7 @@ ppc-linux-nat.o: ppc-linux-nat.c $(defs_h) $(gdbcore_h) $(frame_h) \
 	$(inferior_h) target.h
 
 ppc-linux-tdep.o: ppc-linux-tdep.c $(defs_h) $(gdbcore_h) $(inferior_h) \
-	target.h
+	target.h ppc-tdep.h
 
 ppcbug-rom.o: ppcbug-rom.c monitor.h $(bfd_h) gdb_wait.h $(defs_h) $(gdbcmd_h) \
 	$(inferior_h) target.h serial.h terminal.h
@@ -1769,7 +1769,7 @@ rs6000-nat.o: rs6000-nat.c $(bfd_h) $(defs_h) $(inferior_h) target.h \
 	xcoffsolib.h
 
 rs6000-tdep.o: rs6000-tdep.c $(defs_h) $(gdbcore_h) $(inferior_h) \
-	target.h xcoffsolib.h
+	target.h xcoffsolib.h ppc-tdep.h
 
 scm-exp.o: $(defs_h) $(value_h) parser-defs.h language.h c-lang.h \
 	scm-lang.h scm-tags.h

gdb/config/powerpc/aix.mt

@@ -1,3 +1,3 @@
 # Target: PowerPC running AIX
-TDEPFILES= rs6000-tdep.o xcoffsolib.o
+TDEPFILES= rs6000-tdep.o xcoffsolib.o ppc-linux-tdep.o
 TM_FILE= tm-ppc-aix.h

gdb/config/powerpc/cygwin.mt

@@ -1,5 +1,5 @@
 # Target: Powerpc running cygnus's unix api over win32
-TDEPFILES= rs6000-tdep.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-cygwin.h
 
 

gdb/config/powerpc/macos.mt

@@ -1,3 +1,3 @@
 # Target: PowerMac (PowerPC running MacOS)
-TDEPFILES= rs6000-tdep.o xcoffread.o
+TDEPFILES= rs6000-tdep.o xcoffread.o ppc-linux-tdep.o
 TM_FILE= tm-macos.h

gdb/config/powerpc/nbsd.mt

@@ -1,5 +1,5 @@
 # Target: PowerPC, running NetBSD
-TDEPFILES= rs6000-tdep.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-nbsd.h
 
 GDBSERVER_DEPFILES= low-nbsd.o

gdb/config/powerpc/ppc-eabi.mt

@@ -1,3 +1,3 @@
 # Target: PowerPC running eabi
-TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o dink32-rom.o ppc-bdm.o ocd.o remote-sds.o
+TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o dink32-rom.o ppc-bdm.o ocd.o remote-sds.o ppc-linux-tdep.o
 TM_FILE= tm-ppc-eabi.h

gdb/config/powerpc/ppc-nw.mt

@@ -1,3 +1,3 @@
 # Target: PowerPC running Netware
-TDEPFILES= rs6000-tdep.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-ppc-nw.h

gdb/config/powerpc/ppc-sim.mt

@@ -1,5 +1,5 @@
 # Target: PowerPC running eabi and including the simulator
-TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o dink32-rom.o ppc-bdm.o ocd.o remote-sds.o
+TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o dink32-rom.o ppc-bdm.o ocd.o remote-sds.o ppc-linux-tdep.o
 TM_FILE= tm-ppc-eabi.h
 
 SIM_OBS = remote-sim.o

gdb/config/powerpc/ppcle-eabi.mt

@@ -1,3 +1,3 @@
 # Target: PowerPC running eabi in little endian mode
-TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o ppc-bdm.o ocd.o
+TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o ppc-bdm.o ocd.o ppc-linux-tdep.o
 TM_FILE= tm-ppcle-eabi.h

gdb/config/powerpc/ppcle-sim.mt

@@ -1,5 +1,5 @@
 # Target: PowerPC running eabi in little endian mode under the simulator
-TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o ppc-bdm.o ocd.o
+TDEPFILES= ser-ocd.o rs6000-tdep.o monitor.o dsrec.o ppcbug-rom.o ppc-bdm.o ocd.o ppc-linux-tdep.o
 TM_FILE= tm-ppcle-eabi.h
 
 SIM_OBS = remote-sim.o

gdb/config/powerpc/solaris.mt

@@ -1,3 +1,3 @@
 # Target: PowerPC, running Solaris 2
-TDEPFILES= rs6000-tdep.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-solaris.h

gdb/config/powerpc/tm-linux.h

@@ -42,9 +42,6 @@ extern int at_subroutine_call_instruction_target();
    in symfile.c) */
 #undef IBM6000_TARGET
 
-/* Offset to saved PC in sigcontext, from <linux/signal.h>.  */
-#define SIGCONTEXT_PC_OFFSET 184
-
 extern CORE_ADDR ppc_linux_skip_trampoline_code (CORE_ADDR pc);
 #undef SKIP_TRAMPOLINE_CODE
 #define	SKIP_TRAMPOLINE_CODE(pc) ppc_linux_skip_trampoline_code (pc)
@@ -53,36 +50,10 @@ extern int ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name);
 #undef IN_SIGTRAMP
 #define IN_SIGTRAMP(pc,func_name) ppc_linux_in_sigtramp (pc,func_name)
 
-extern unsigned long ppc_linux_frame_saved_pc (struct frame_info *);
+#if 0
-#undef FRAME_SAVED_PC
-#define FRAME_SAVED_PC(FRAME) ppc_linux_frame_saved_pc (FRAME)
-
-extern void ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *);
-#undef  INIT_EXTRA_FRAME_INFO
-#define	INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
-  ppc_linux_init_extra_frame_info (fromleaf, fi)
-
-extern int ppc_linux_frameless_function_invocation (struct frame_info *);
-#undef FRAMELESS_FUNCTION_INVOCATION
-#define FRAMELESS_FUNCTION_INVOCATION(FI) \
-  (ppc_linux_frameless_function_invocation (FI))
-
-extern void ppc_linux_frame_init_saved_regs (struct frame_info *);
-#undef FRAME_INIT_SAVED_REGS
-#define FRAME_INIT_SAVED_REGS(FI) ppc_linux_frame_init_saved_regs (FI)
-
-CORE_ADDR ppc_linux_frame_chain (struct frame_info *);
-#undef FRAME_CHAIN
-#define FRAME_CHAIN(thisframe) ppc_linux_frame_chain (thisframe)
-
-CORE_ADDR ppc_sysv_abi_push_arguments (int, struct value **, CORE_ADDR, int,
-				       CORE_ADDR);
-#undef PUSH_ARGUMENTS
-#define	PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
-  (ppc_sysv_abi_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
-
 #define CANNOT_FETCH_REGISTER(regno) ((regno) >= MQ_REGNUM)
 #define CANNOT_STORE_REGISTER(regno) ((regno) >= MQ_REGNUM)
+#endif
 
 /* Linux doesn't use the PowerOpen ABI for function pointer representation */
 #undef CONVERT_FROM_FUNC_PTR_ADDR
@@ -94,13 +65,6 @@ CORE_ADDR ppc_sysv_abi_push_arguments (int, struct value **, CORE_ADDR, int,
 #define PROLOGUE_FIRSTLINE_OVERLAP
 #endif
 
-/* Needed to handled the self-modifying code situation due to the dynamic
-   linker. */
-int ppc_linux_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache);
-#undef MEMORY_REMOVE_BREAKPOINT
-#define MEMORY_REMOVE_BREAKPOINT(addr, contents_cache) \
-  ppc_linux_memory_remove_breakpoint(addr, contents_cache)
-
 /* N_FUN symbols in shared libaries have 0 for their values and need
    to be relocated. */
 #define SOFUN_ADDRESS_MAYBE_MISSING

gdb/config/powerpc/vxworks.mt

@@ -1,3 +1,3 @@
 # Target: Powerpc running VxWorks
-TDEPFILES= rs6000-tdep.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-vxworks.h

gdb/config/rs6000/aix4.mt

@@ -1,3 +1,3 @@
 # Target: IBM RS/6000 running AIX4
-TDEPFILES= rs6000-tdep.o xcoffsolib.o xcoffread.o
+TDEPFILES= rs6000-tdep.o xcoffsolib.o xcoffread.o ppc-linux-tdep.o
 TM_FILE= tm-rs6000-aix4.h

gdb/config/rs6000/rs6000.mt

@@ -1,3 +1,3 @@
 # Target: IBM RS/6000 running AIX
-TDEPFILES= rs6000-tdep.o xcoffsolib.o xcoffread.o
+TDEPFILES= rs6000-tdep.o xcoffsolib.o xcoffread.o ppc-linux-tdep.o
 TM_FILE= tm-rs6000.h

gdb/config/rs6000/rs6000lynx.mt

@@ -1,3 +1,3 @@
 # Target: IBM RS6000 running LynxOS
-TDEPFILES= coff-solib.o rs6000-tdep.o
+TDEPFILES= coff-solib.o rs6000-tdep.o ppc-linux-tdep.o
 TM_FILE= tm-rs6000ly.h

gdb/dink32-rom.c

@@ -115,7 +115,7 @@ dink32_load (struct monitor_ops *monops, char *filename, int from_tty)
    different names than GDB does, and don't support all the registers
    either.  */
 
-static char *dink32_regnames[NUM_REGS] =
+static char *dink32_regnames[] =
 {
   "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",

gdb/ppc-bdm.c

@@ -36,6 +36,7 @@
 #include <signal.h>
 #include "serial.h"
 #include "ocd.h"
+#include "ppc-tdep.h"
 
 static void bdm_ppc_open (char *name, int from_tty);
 
@@ -198,7 +199,7 @@ bdm_ppc_fetch_registers (int regno)
 /*      printf("Asking for register %d\n", first_regno); */
 
       /* if asking for an invalid register */
-      if ((first_regno == MQ_REGNUM) ||
+      if ((first_regno == PPC_MQ_REGNUM) ||
 	  ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
 	{
 /*          printf("invalid reg request!\n"); */
@@ -287,14 +288,14 @@ bdm_ppc_store_registers (int regno)
 
       /* only attempt to write if it's a valid ppc 8xx register */
       /* (need to avoid FP regs and MQ reg) */
-      if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
+      if ((i != PPC_MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
 	{
 /*          printf("write valid reg %d\n", bdm_regno); */
 	  ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
 	}
 /*
-   else if (i == MQ_REGNUM)
+   else if (i == PPC_MQ_REGNUM)
-   printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
+   printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
    else
    printf("don't write invalid reg %d\n", bdm_regno);
  */

gdb/ppc-linux-tdep.c

@@ -29,6 +29,8 @@
 #include "symfile.h"
 #include "objfiles.h"
 
+#include "ppc-tdep.h"
+
 /* The following two instructions are used in the signal trampoline
    code on linux/ppc */
 #define INSTR_LI_R0_0x7777	0x38007777
@@ -95,7 +97,7 @@
 #define PPC_LINUX_PT_FPR31 (PPC_LINUX_PT_FPR0 + 2*31)
 #define PPC_LINUX_PT_FPSCR (PPC_LINUX_PT_FPR0 + 2*32 + 1)
 
-int ppc_linux_at_sigtramp_return_path (CORE_ADDR pc);
+static int ppc_linux_at_sigtramp_return_path (CORE_ADDR pc);
 
 /* Determine if pc is in a signal trampoline...
 
@@ -150,7 +152,7 @@ ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
   char buf[4];
   CORE_ADDR handler;
 
-  lr = read_register (LR_REGNUM);
+  lr = read_register (PPC_LR_REGNUM);
   if (!ppc_linux_at_sigtramp_return_path (lr))
     return 0;
 
@@ -177,7 +179,7 @@ ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
  * instructions.  It'd be faster though if we could find a way to do this
  * via some simple address comparisons.
  */
-int
+static int
 ppc_linux_at_sigtramp_return_path (CORE_ADDR pc)
 {
   char buf[12];
@@ -308,7 +310,7 @@ ppc_linux_skip_trampoline_code (CORE_ADDR pc)
 /* The rs6000 version of FRAME_SAVED_PC will almost work for us.  The
    signal handler details are different, so we'll handle those here
    and call the rs6000 version to do the rest. */
-unsigned long
+CORE_ADDR
 ppc_linux_frame_saved_pc (struct frame_info *fi)
 {
   if (fi->signal_handler_caller)
@@ -372,14 +374,14 @@ ppc_linux_frame_init_saved_regs (struct frame_info *fi)
       regs_addr =
 	read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
       fi->saved_regs[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP;
-      fi->saved_regs[PS_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MSR;
+      fi->saved_regs[PPC_PS_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MSR;
-      fi->saved_regs[CR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CCR;
+      fi->saved_regs[PPC_CR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CCR;
-      fi->saved_regs[LR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_LNK;
+      fi->saved_regs[PPC_LR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_LNK;
-      fi->saved_regs[CTR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CTR;
+      fi->saved_regs[PPC_CTR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CTR;
-      fi->saved_regs[XER_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_XER;
+      fi->saved_regs[PPC_XER_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_XER;
-      fi->saved_regs[MQ_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MQ;
+      fi->saved_regs[PPC_MQ_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MQ;
       for (i = 0; i < 32; i++)
-	fi->saved_regs[GP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i;
+	fi->saved_regs[PPC_GP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i;
       for (i = 0; i < 32; i++)
 	fi->saved_regs[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i;
     }

gdb/ppc-tdep.h

@@ -0,0 +1,49 @@
+/* Target-dependent code for GDB, the GNU debugger.
+   Copyright 2000
+   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.  */
+
+/* From ppc-linux-tdep.c... */
+CORE_ADDR ppc_linux_frame_saved_pc (struct frame_info *fi);
+void ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *);
+int ppc_linux_frameless_function_invocation (struct frame_info *);
+void ppc_linux_frame_init_saved_regs (struct frame_info *);
+CORE_ADDR ppc_linux_frame_chain (struct frame_info *);
+CORE_ADDR ppc_sysv_abi_push_arguments (int, value_ptr *, CORE_ADDR, int,
+				       CORE_ADDR);
+int ppc_linux_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache);
+
+
+/* From rs6000-tdep.c... */
+CORE_ADDR rs6000_frame_saved_pc (struct frame_info *fi);
+void rs6000_init_extra_frame_info (int fromleaf, struct frame_info *);
+int rs6000_frameless_function_invocation (struct frame_info *);
+void rs6000_frame_init_saved_regs (struct frame_info *);
+CORE_ADDR rs6000_frame_chain (struct frame_info *);
+
+/* Some important register numbers. */
+
+#define	PPC_GP0_REGNUM 0		/* GPR register 0 */
+#define	PPC_TOC_REGNUM 2		/* TOC register */
+#define PPC_PS_REGNUM 65		/* Processor (or machine) status (%msr) */
+#define	PPC_CR_REGNUM 66		/* Condition register */
+#define	PPC_LR_REGNUM 67		/* Link register */
+#define	PPC_CTR_REGNUM 68		/* Count register */
+#define	PPC_XER_REGNUM 69		/* Integer exception register */
+#define	PPC_MQ_REGNUM 70		/* Multiply/Divide extension register */

gdb/rs6000-tdep.c

@@ -35,15 +35,9 @@
 #include "coff/internal.h"	/* for libcoff.h */
 #include "bfd/libcoff.h"	/* for xcoff_data */
 
-/* Some important register numbers.  Keep these in the same order as in
+#include "elf-bfd.h"
-   /usr/mstsave.h `mstsave' structure, for easier processing. */
 
-#define	GP0_REGNUM 0		/* GPR register 0 */
+#include "ppc-tdep.h"
-#define	TOC_REGNUM 2		/* TOC register */
-#define PS_REGNUM 65		/* Processor (or machine) status (%msr) */
-#define	CR_REGNUM 66		/* Condition register */
-#define	LR_REGNUM 67		/* Link register */
-#define	CTR_REGNUM 68		/* Count register */
 
 /* If the kernel has to deliver a signal, it pushes a sigcontext
    structure on the stack and then calls the signal handler, passing
@@ -89,6 +83,7 @@ struct reg
 struct gdbarch_tdep
   {
     int wordsize;		/* size in bytes of fixed-point word */
+    int osabi;			/* OS / ABI from ELF header */
     int *regoff;		/* byte offsets in register arrays */
     const struct reg *regs;	/* from current variant */
   };
@@ -157,7 +152,7 @@ struct frame_extra_info
   CORE_ADDR initial_sp;		/* initial stack pointer. */
 };
 
-static void
+void
 rs6000_init_extra_frame_info (int fromleaf, struct frame_info *fi)
 {
   fi->extra_info = (struct frame_extra_info *)
@@ -182,7 +177,7 @@ rs6000_init_extra_frame_info (int fromleaf, struct frame_info *fi)
    not sure if it will be needed. The following function takes care of gpr's
    and fpr's only. */
 
-static void
+void
 rs6000_frame_init_saved_regs (struct frame_info *fi)
 {
   frame_get_saved_regs (fi, NULL);
@@ -205,7 +200,7 @@ rs6000_frame_args_address (struct frame_info *fi)
 static CORE_ADDR
 rs6000_saved_pc_after_call (struct frame_info *fi)
 {
-  return read_register (LR_REGNUM);
+  return read_register (PPC_LR_REGNUM);
 }
 
 /* Calculate the destination of a branch/jump.  Return -1 if not a branch.  */
@@ -243,7 +238,7 @@ branch_dest (int opcode, int instr, CORE_ADDR pc, CORE_ADDR safety)
 
       if (ext_op == 16)		/* br conditional register */
 	{
-	  dest = read_register (LR_REGNUM) & ~3;
+	  dest = read_register (PPC_LR_REGNUM) & ~3;
 
 	  /* If we are about to return from a signal handler, dest is
 	     something like 0x3c90.  The current frame is a signal handler
@@ -262,13 +257,13 @@ branch_dest (int opcode, int instr, CORE_ADDR pc, CORE_ADDR safety)
 
       else if (ext_op == 528)	/* br cond to count reg */
 	{
-	  dest = read_register (CTR_REGNUM) & ~3;
+	  dest = read_register (PPC_CTR_REGNUM) & ~3;
 
 	  /* If we are about to execute a system call, dest is something
 	     like 0x22fc or 0x3b00.  Upon completion the system call
 	     will return to the address in the link register.  */
 	  if (dest < TEXT_SEGMENT_BASE)
-	    dest = read_register (LR_REGNUM) & ~3;
+	    dest = read_register (PPC_LR_REGNUM) & ~3;
 	}
       else
 	return -1;
@@ -715,7 +710,7 @@ rs6000_pop_frame (void)
   else
     prev_sp = read_memory_addr (sp, wordsize);
   if (fdata.lr_offset == 0)
-    lr = read_register (LR_REGNUM);
+    lr = read_register (PPC_LR_REGNUM);
   else
     lr = read_memory_addr (prev_sp + fdata.lr_offset, wordsize);
 
@@ -766,7 +761,7 @@ rs6000_fix_call_dummy (char *dummyname, CORE_ADDR pc, CORE_ADDR fun,
   if (rs6000_find_toc_address_hook != NULL)
     {
       CORE_ADDR tocvalue = (*rs6000_find_toc_address_hook) (fun);
-      write_register (TOC_REGNUM, tocvalue);
+      write_register (PPC_TOC_REGNUM, tocvalue);
     }
 }
 
@@ -989,7 +984,7 @@ ran_out_of_registers_for_arguments:
 static CORE_ADDR
 ppc_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
 {
-  write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ());
+  write_register (PPC_LR_REGNUM, CALL_DUMMY_ADDRESS ());
   return sp;
 }
 
@@ -1085,7 +1080,7 @@ rs6000_skip_trampoline_code (CORE_ADDR pc)
 
 /* Determines whether the function FI has a frame on the stack or not.  */
 
-static int
+int
 rs6000_frameless_function_invocation (struct frame_info *fi)
 {
   CORE_ADDR func_start;
@@ -1119,7 +1114,7 @@ rs6000_frameless_function_invocation (struct frame_info *fi)
 
 /* Return the PC saved in a frame */
 
-static CORE_ADDR
+CORE_ADDR
 rs6000_frame_saved_pc (struct frame_info *fi)
 {
   CORE_ADDR func_start;
@@ -1152,7 +1147,7 @@ rs6000_frame_saved_pc (struct frame_info *fi)
     }
 
   if (fdata.lr_offset == 0)
-    return read_register (LR_REGNUM);
+    return read_register (PPC_LR_REGNUM);
 
   return read_memory_addr (FRAME_CHAIN (fi) + fdata.lr_offset, wordsize);
 }
@@ -1223,12 +1218,12 @@ frame_get_saved_regs (struct frame_info *fi, struct rs6000_framedata *fdatap)
   /* If != 0, fdatap->cr_offset is the offset from the frame that holds
      the CR.  */
   if (fdatap->cr_offset != 0)
-    fi->saved_regs[CR_REGNUM] = frame_addr + fdatap->cr_offset;
+    fi->saved_regs[PPC_CR_REGNUM] = frame_addr + fdatap->cr_offset;
 
   /* If != 0, fdatap->lr_offset is the offset from the frame that holds
      the LR.  */
   if (fdatap->lr_offset != 0)
-    fi->saved_regs[LR_REGNUM] = frame_addr + fdatap->lr_offset;
+    fi->saved_regs[PPC_LR_REGNUM] = frame_addr + fdatap->lr_offset;
 }
 
 /* Return the address of a frame. This is the inital %sp value when the frame
@@ -1313,7 +1308,7 @@ frame_initial_stack_address (struct frame_info *fi)
 /* In the case of the RS/6000, the frame's nominal address
    is the address of a 4-byte word containing the calling frame's address.  */
 
-static CORE_ADDR
+CORE_ADDR
 rs6000_frame_chain (struct frame_info *thisframe)
 {
   CORE_ADDR fp, fpp, lr;
@@ -1338,7 +1333,7 @@ rs6000_frame_chain (struct frame_info *thisframe)
   else
     fp = read_memory_addr ((thisframe)->frame, wordsize);
 
-  lr = read_register (LR_REGNUM);
+  lr = read_register (PPC_LR_REGNUM);
   if (lr == entry_point_address ())
     if (fp != 0 && (fpp = read_memory_addr (fp, wordsize)) != 0)
       if (PC_IN_CALL_DUMMY (lr, fpp, fpp))
@@ -1500,7 +1495,7 @@ rs6000_store_return_value (struct type *type, char *valbuf)
 			  TYPE_LENGTH (type));
   else
     /* Everything else is returned in GPR3 and up. */
-    write_register_bytes (REGISTER_BYTE (GP0_REGNUM + 3), valbuf,
+    write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM + 3), valbuf,
 			  TYPE_LENGTH (type));
 }
 
@@ -1909,6 +1904,84 @@ find_variant_by_arch (enum bfd_architecture arch, unsigned long mach)
   return NULL;
 }
 
+
+
+
+static void
+process_note_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
+{
+  int *os_ident_ptr = obj;
+  const char *name;
+  unsigned int sectsize;
+
+  name = bfd_get_section_name (abfd, sect);
+  sectsize = bfd_section_size (abfd, sect);
+  if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0)
+    {
+      unsigned int name_length, data_length, note_type;
+      char *note = alloca (sectsize);
+
+      bfd_get_section_contents (abfd, sect, note,
+                                (file_ptr) 0, (bfd_size_type) sectsize);
+
+      name_length = bfd_h_get_32 (abfd, note);
+      data_length = bfd_h_get_32 (abfd, note + 4);
+      note_type   = bfd_h_get_32 (abfd, note + 8);
+
+      if (name_length == 4 && data_length == 16 && note_type == 1
+          && strcmp (note + 12, "GNU") == 0)
+	{
+	  int os_number = bfd_h_get_32 (abfd, note + 16);
+
+	  /* The case numbers are from abi-tags in glibc */
+	  switch (os_number)
+	    {
+	    case 0 :
+	      *os_ident_ptr = ELFOSABI_LINUX;
+	      break;
+	    case 1 :
+	      *os_ident_ptr = ELFOSABI_HURD;
+	      break;
+	    case 2 :
+	      *os_ident_ptr = ELFOSABI_SOLARIS;
+	      break;
+	    default :
+	      internal_error (
+		"process_note_abi_sections: unknown OS number %d", os_number);
+	      break;
+	    }
+	}
+    }
+}
+
+/* Return one of the ELFOSABI_ constants for BFDs representing ELF
+   executables.  If it's not an ELF executable or if the OS/ABI couldn't
+   be determined, simply return -1. */
+
+static int
+get_elfosabi (bfd *abfd)
+{
+  int elfosabi = -1;
+
+  if (abfd != NULL && bfd_get_flavour (abfd) == bfd_target_elf_flavour)
+    {
+      elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
+
+      /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
+         that we're on a SYSV system.  However, GNU/Linux uses a note section
+	 to record OS/ABI info, but leaves e_ident[EI_OSABI] zero.  So we
+	 have to check the note sections too. */
+      if (elfosabi == 0)
+	{
+	  bfd_map_over_sections (abfd,
+	                         process_note_abi_tag_sections,
+				 &elfosabi);
+	}
+    }
+
+  return elfosabi;
+}
+
 
 
 /* Initialize the current architecture based on INFO.  If possible, re-use an
@@ -1923,25 +1996,40 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 {
   struct gdbarch *gdbarch;
   struct gdbarch_tdep *tdep;
-  int wordsize, fromexec, power, i, off;
+  int wordsize, from_xcoff_exec, from_elf_exec, power, i, off;
   struct reg *regs;
   const struct variant *v;
   enum bfd_architecture arch;
   unsigned long mach;
   bfd abfd;
+  int osabi, sysv_abi;
 
-  fromexec = info.abfd && info.abfd->format == bfd_object &&
+  from_xcoff_exec = info.abfd && info.abfd->format == bfd_object &&
     bfd_get_flavour (info.abfd) == bfd_target_xcoff_flavour;
 
+  from_elf_exec = info.abfd && info.abfd->format == bfd_object &&
+    bfd_get_flavour (info.abfd) == bfd_target_elf_flavour;
+
+  sysv_abi = info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour;
+
+  osabi = get_elfosabi (info.abfd);
+
   /* Check word size.  If INFO is from a binary file, infer it from that,
      else use the previously-inferred size. */
-  if (fromexec)
+  if (from_xcoff_exec)
     {
       if (xcoff_data (info.abfd)->xcoff64)
 	wordsize = 8;
       else
 	wordsize = 4;
     }
+  else if (from_elf_exec)
+    {
+      if (elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
+	wordsize = 8;
+      else
+	wordsize = 4;
+    }
   else
     {
       tdep = TDEP;
@@ -1960,7 +2048,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
          meaningful, because 64-bit CPUs can run in 32-bit mode.  So, perform
          separate word size check. */
       tdep = gdbarch_tdep (arches->gdbarch);
-      if (tdep && tdep->wordsize == wordsize)
+      if (tdep && tdep->wordsize == wordsize && tdep->osabi == osabi)
 	return arches->gdbarch;
     }
 
@@ -1972,7 +2060,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
        - "set arch"		trust blindly
        - GDB startup		useless but harmless */
 
-  if (!fromexec)
+  if (!from_xcoff_exec)
     {
       arch = info.bfd_architecture;
       mach = info.bfd_arch_info->mach;
@@ -1986,6 +2074,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
     }
   tdep = xmalloc (sizeof (struct gdbarch_tdep));
   tdep->wordsize = wordsize;
+  tdep->osabi = osabi;
   gdbarch = gdbarch_alloc (&info, tdep);
   power = arch == bfd_arch_rs6000;
 
@@ -2060,16 +2149,17 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_register_convert_to_raw (gdbarch, rs6000_register_convert_to_raw);
 
   set_gdbarch_extract_return_value (gdbarch, rs6000_extract_return_value);
-  set_gdbarch_push_arguments (gdbarch, rs6000_push_arguments);
+  
+  if (sysv_abi)
+    set_gdbarch_push_arguments (gdbarch, ppc_sysv_abi_push_arguments);
+  else
+    set_gdbarch_push_arguments (gdbarch, rs6000_push_arguments);
 
   set_gdbarch_store_struct_return (gdbarch, rs6000_store_struct_return);
   set_gdbarch_store_return_value (gdbarch, rs6000_store_return_value);
   set_gdbarch_extract_struct_value_address (gdbarch, rs6000_extract_struct_value_address);
   set_gdbarch_use_struct_convention (gdbarch, generic_use_struct_convention);
 
-  set_gdbarch_frame_init_saved_regs (gdbarch, rs6000_frame_init_saved_regs);
-  set_gdbarch_init_extra_frame_info (gdbarch, rs6000_init_extra_frame_info);
-
   set_gdbarch_pop_frame (gdbarch, rs6000_pop_frame);
 
   set_gdbarch_skip_prologue (gdbarch, rs6000_skip_prologue);
@@ -2081,10 +2171,32 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Not sure on this. FIXMEmgo */
   set_gdbarch_frame_args_skip (gdbarch, 8);
 
-  set_gdbarch_frameless_function_invocation (gdbarch, rs6000_frameless_function_invocation);
-  set_gdbarch_frame_chain (gdbarch, rs6000_frame_chain);
   set_gdbarch_frame_chain_valid (gdbarch, file_frame_chain_valid);
-  set_gdbarch_frame_saved_pc (gdbarch, rs6000_frame_saved_pc);
+  if (osabi == ELFOSABI_LINUX)
+    {
+      set_gdbarch_frameless_function_invocation (gdbarch,
+	ppc_linux_frameless_function_invocation);
+      set_gdbarch_frame_chain (gdbarch, ppc_linux_frame_chain);
+      set_gdbarch_frame_saved_pc (gdbarch, ppc_linux_frame_saved_pc);
+
+      set_gdbarch_frame_init_saved_regs (gdbarch,
+	                                 ppc_linux_frame_init_saved_regs);
+      set_gdbarch_init_extra_frame_info (gdbarch,
+	                                 ppc_linux_init_extra_frame_info);
+
+      set_gdbarch_memory_remove_breakpoint (gdbarch,
+	                                    ppc_linux_memory_remove_breakpoint);
+    }
+  else
+    {
+      set_gdbarch_frameless_function_invocation (gdbarch,
+	rs6000_frameless_function_invocation);
+      set_gdbarch_frame_chain (gdbarch, rs6000_frame_chain);
+      set_gdbarch_frame_saved_pc (gdbarch, rs6000_frame_saved_pc);
+
+      set_gdbarch_frame_init_saved_regs (gdbarch, rs6000_frame_init_saved_regs);
+      set_gdbarch_init_extra_frame_info (gdbarch, rs6000_init_extra_frame_info);
+    }
   set_gdbarch_frame_args_address (gdbarch, rs6000_frame_args_address);
   set_gdbarch_frame_locals_address (gdbarch, rs6000_frame_args_address);
   set_gdbarch_saved_pc_after_call (gdbarch, rs6000_saved_pc_after_call);