[RFA] Support for alpha*-*-netbsd*

[Jason R Thorpe <thorpej@wasabisystems.com>]

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The following patch adds support for NetBSD/alpha.  It includes
a software single-step implementation (required by NetBSD/alpha)
which could be useful for single-stepping of remote Alpha targets
as well.

OK to commit?

	* alpha-tdep.c: Update copyright years.
	(alpha_next_pc): New function.
	(alpha_software_single_step): Ditto.
	* alphabsd-nat.c: Update copyright years.
	(fill_gregset): Use regcache_collect.
	(fill_fpregset): Likewise.
	(fetch_inferior_registers): Only fetch integer registers
	if requested to do so.
	(store_inferior_registers): Only store integer registers
	if requested to do so.
	* alphanbsd-nat.c: New file.
	* configure.host (alpha*-*-netbsd*): New host.
	* configure.tgt (alpha*-*-netbsd*): New target.
	* config/nm-nbsd.h (KERNEL_U_ADDR): Remove.
	* config/alpha/tm-alpha.h: Add prototype for
	alpha_software_single_step.
	* config/alpha/nbsd.mh: New file.
	* config/alpha/nbsd.mt: Ditto.
	* config/alpha/nm-nbsd.h: Ditto.
	* config/alpha/tm-alpha.h: Ditto.
	* config/alpha/tm-nbsd.h: Ditto.
	* config/alpha/xm-nbsd.h: Ditto.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>

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Index: alpha-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/alpha-tdep.c,v
retrieving revision 1.11
diff -c -r1.11 alpha-tdep.c
*** alpha-tdep.c	2001/08/01 18:39:22	1.11
--- alpha-tdep.c	2002/01/18 06:27:15
***************
*** 1,5 ****
  /* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
!    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
     Free Software Foundation, Inc.
  
     This file is part of GDB.
--- 1,5 ----
  /* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
!    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
     Free Software Foundation, Inc.
  
     This file is part of GDB.
***************
*** 1384,1389 ****
--- 1384,1498 ----
      return 0;
    else
      return SYMBOL_VALUE_ADDRESS (sym) + 4;
+ }
+ 
+ /* alpha_software_single_step() is called just before we want to resume
+    the inferior, if we want to single-step it but there is no hardware
+    or kernel single-step support (NetBSD on Alpha, for example).  We find
+    the target of the coming instruction and breakpoint it.
+ 
+    single_step is also called just after the inferior stops.  If we had
+    set up a simulated single-step, we undo our damage.  */
+ 
+ static CORE_ADDR
+ alpha_next_pc (CORE_ADDR pc)
+ {
+   unsigned int insn;
+   unsigned int op;
+   int offset;
+   LONGEST rav;
+ 
+   insn = read_memory_unsigned_integer (pc, sizeof (insn));
+ 
+   /* Opcode is top 6 bits. */
+   op = (insn >> 26) & 0x3f;
+ 
+   if (op == 0x1a)
+     {
+       /* Jump format: target PC is:
+ 	 RB & ~3  */
+       return (read_register ((insn >> 16) & 0x1f) & ~3);
+     }
+ 
+   if ((op & 0x30) == 0x30)
+     {
+       /* Branch format: target PC is:
+ 	 (new PC) + (4 * sext(displacement))  */
+       if (op == 0x30 ||		/* BR */
+ 	  op == 0x34)		/* BSR */
+ 	{
+  branch_taken:
+           offset = (insn & 0x001fffff);
+ 	  if (offset & 0x00100000)
+ 	    offset  |= 0xffe00000;
+ 	  offset *= 4;
+ 	  return (pc + 4 + offset);
+ 	}
+ 
+       /* Need to determine if branch is taken; read RA.  */
+       rav = (LONGEST) read_register ((insn >> 21) & 0x1f);
+       switch (op)
+ 	{
+ 	case 0x38:		/* BLBC */
+ 	  if ((rav & 1) == 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3c:		/* BLBS */
+ 	  if (rav & 1)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x39:		/* BEQ */
+ 	  if (rav == 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3d:		/* BNE */
+ 	  if (rav != 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3a:		/* BLT */
+ 	  if (rav < 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3b:		/* BLE */
+ 	  if (rav <= 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3f:		/* BGT */
+ 	  if (rav > 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	case 0x3e:		/* BGE */
+ 	  if (rav >= 0)
+ 	    goto branch_taken;
+ 	  break;
+ 	}
+     }
+ 
+   /* Not a branch or branch not taken; target PC is:
+      pc + 4  */
+   return (pc + 4);
+ }
+ 
+ void
+ alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p)
+ {
+   static CORE_ADDR next_pc;
+   typedef char binsn_quantum[BREAKPOINT_MAX];
+   static binsn_quantum break_mem;
+   CORE_ADDR pc;
+ 
+   if (insert_breakpoints_p)
+     {
+       pc = read_pc ();
+       next_pc = alpha_next_pc (pc);
+ 
+       target_insert_breakpoint (next_pc, break_mem);
+     }
+   else
+     {
+       target_remove_breakpoint (next_pc, break_mem);
+       write_pc (next_pc);
+     }
  }
  
  void
Index: alphabsd-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/alphabsd-nat.c,v
retrieving revision 1.5
diff -c -r1.5 alphabsd-nat.c
*** alphabsd-nat.c	2001/05/04 04:15:24	1.5
--- alphabsd-nat.c	2002/01/18 06:27:15
***************
*** 1,5 ****
  /* Native-dependent code for Alpha BSD's.
!    Copyright 2000, 2001 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
--- 1,5 ----
  /* Native-dependent code for Alpha BSD's.
!    Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
  
     This file is part of GDB.
  
***************
*** 45,50 ****
--- 45,55 ----
  
  /* Number of floating point registers.  */
  #define NUM_FPREGS 31
+ 
+ /* Determine if PT_GETREGS fetches this register.  */
+ #define GETREGS_SUPPLIES(regno) \
+   (((regno) >= V0_REGNUM && (regno) <= ZERO_REGNUM) || \
+    (regno) >= PC_REGNUM)
  \f
  
  /* Transfering the registers between GDB, inferiors and core files.  */
***************
*** 80,92 ****
  
    for (i = 0; i < NUM_GREGS; i++)
      if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
!       memcpy (&gregsetp->r_regs[i], &registers[REGISTER_BYTE (i)],
! 	      REGISTER_RAW_SIZE (i));
  
    /* The PC travels in the R_ZERO slot.  */
    if (regno == -1 || regno == PC_REGNUM)
!     memcpy (&gregsetp->r_regs[R_ZERO], &registers[REGISTER_BYTE (PC_REGNUM)],
! 	    REGISTER_RAW_SIZE (PC_REGNUM));
  }
  
  /* Fill GDB's register array with the floating-point register values
--- 85,95 ----
  
    for (i = 0; i < NUM_GREGS; i++)
      if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
!       regcache_collect (i, (char *) &gregsetp->r_regs[i]);
  
    /* The PC travels in the R_ZERO slot.  */
    if (regno == -1 || regno == PC_REGNUM)
!     regcache_collect (PC_REGNUM, (char *) &gregsetp->r_regs[R_ZERO]);
  }
  
  /* Fill GDB's register array with the floating-point register values
***************
*** 119,130 ****
  
    for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
      if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
!       memcpy (&fpregsetp->fpr_regs[i - FP0_REGNUM],
! 	      &registers[REGISTER_BYTE (i)], REGISTER_RAW_SIZE (i));
  
    if (regno == -1 || regno == FPCR_REGNUM)
!     memcpy (&fpregsetp->fpr_cr, &registers[REGISTER_BYTE (FPCR_REGNUM)],
! 	    REGISTER_RAW_SIZE (FPCR_REGNUM));
  }
  
  /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
--- 122,131 ----
  
    for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
      if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
!       regcache_collect (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
  
    if (regno == -1 || regno == FPCR_REGNUM)
!     regcache_collect (FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
  }
  
  /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
***************
*** 133,145 ****
  void
  fetch_inferior_registers (int regno)
  {
-   gregset_t gregs;
  
!   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
!               (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
!     perror_with_name ("Couldn't get registers");
  
!   supply_gregset (&gregs);
  
    if (regno == -1 || regno >= FP0_REGNUM)
      {
--- 134,152 ----
  void
  fetch_inferior_registers (int regno)
  {
  
!   if (regno == -1 || GETREGS_SUPPLIES (regno))
!     {
!       gregset_t gregs;
  
!       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
! 		  (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
! 	perror_with_name ("Couldn't get registers");
! 
!       supply_gregset (&gregs);
!       if (regno != -1)
! 	return;
!     }
  
    if (regno == -1 || regno >= FP0_REGNUM)
      {
***************
*** 162,178 ****
  void
  store_inferior_registers (int regno)
  {
-   gregset_t gregs;
  
!   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
!               (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
!     perror_with_name ("Couldn't get registers");
! 
!   fill_gregset (&gregs, regno);
  
!   if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
!               (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
!     perror_with_name ("Couldn't write registers");
  
    if (regno == -1 || regno >= FP0_REGNUM)
      {
--- 169,191 ----
  void
  store_inferior_registers (int regno)
  {
  
!   if (regno == -1 || GETREGS_SUPPLIES (regno))
!     {
!       gregset_t gregs;
!       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
!                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
!         perror_with_name ("Couldn't get registers");
! 
!       fill_gregset (&gregs, regno);
! 
!       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
!                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
!         perror_with_name ("Couldn't write registers");
  
!       if (regno != -1)
! 	return;
!     }
  
    if (regno == -1 || regno >= FP0_REGNUM)
      {
Index: alphanbsd-nat.c
===================================================================
RCS file: alphanbsd-nat.c
diff -N alphanbsd-nat.c
*** /dev/null	Tue May  5 13:32:27 1998
--- alphanbsd-nat.c	Thu Jan 17 22:27:15 2002
***************
*** 0 ****
--- 1,133 ----
+ /* Native-dependent code for Alpha NetBSD.
+    Copyright 2002 Free Software Foundation, Inc.
+    Contributed by Wasabi Systems, Inc.
+ 
+    This file is part of GDB.
+ 
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+ 
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.  */
+ 
+ #include "defs.h"
+ #include <sys/types.h>
+ #include <machine/reg.h>
+ #include <machine/frame.h>  
+ #include <machine/pcb.h>
+ #include "gdbcore.h"
+ 
+ #ifndef HAVE_GREGSET_T
+ typedef struct reg gregset_t;
+ #endif
+ 
+ #ifndef HAVE_FPREGSET_T
+ typedef struct fpreg fpregset_t; 
+ #endif
+ 
+ #include "gregset.h"
+ 
+ static void
+ fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
+                       CORE_ADDR ignore)
+ {
+   struct md_coredump *core_reg;
+   char *regs;
+   int regno;
+ 
+   /* Table to map a gdb register number to a trapframe register index.  */
+   static const int regmap[] =
+   {
+     FRAME_V0,  FRAME_T0,  FRAME_T1,  FRAME_T2,
+     FRAME_T3,  FRAME_T4,  FRAME_T5,  FRAME_T6,
+     FRAME_T7,  FRAME_S0,  FRAME_S1,  FRAME_S2,
+     FRAME_S3,  FRAME_S4,  FRAME_S5,  FRAME_S6,
+     FRAME_A0,  FRAME_A1,  FRAME_A2,  FRAME_A3,
+     FRAME_A4,  FRAME_A5,  FRAME_T8,  FRAME_T9,
+     FRAME_T10, FRAME_T11, FRAME_RA,  FRAME_T12,
+     FRAME_AT,  FRAME_GP,  FRAME_SP
+   };
+ 
+   /* We get everything from one section.  */
+   if (which != 0)
+     return;
+ 
+   core_reg = (struct md_coredump *) core_reg_sect;
+   regs = (char *) &core_reg->md_tf;
+ 
+   if (core_reg_size < sizeof (*core_reg))
+     {
+       warning ("Wrong size register set in core file.");
+       return;
+     }
+ 
+   /* Integer registers.  */
+   for (regno = 0; regno < ZERO_REGNUM; regno++)
+     supply_register (regno, regs + (regmap[regno] * 8));
+   supply_register (ZERO_REGNUM, NULL);
+   supply_register (FP_REGNUM, NULL);
+   supply_register (PC_REGNUM, regs + (FRAME_PC * 8));
+ 
+   /* Floating point registers.  */
+   supply_fpregset (&core_reg->md_fpstate);
+ }
+ 
+ static void
+ fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which,
+                          CORE_ADDR ignore)
+ {
+   switch (which)
+     {
+     case 0:  /* Integer registers.  */
+       if (core_reg_size != sizeof (struct reg))
+ 	warning ("Wrong size register set in core file.");
+       else
+ 	supply_gregset ((gregset_t *) core_reg_sect);
+       break;
+ 
+     case 2:  /* Floating point registers.  */
+       if (core_reg_size != sizeof (struct fpreg))
+ 	warning ("Wrong size FP register set in core file.");
+       else
+ 	supply_fpregset ((fpregset_t *) core_reg_sect);
+       break;
+ 
+     default:
+       /* Don't know what kind of register request this is; just ignore it.  */
+       break;
+     }
+ }
+ 
+ static struct core_fns alphanbsd_core_fns =
+ {
+   bfd_target_unknown_flavour,		/* core_flavour */
+   default_check_format,			/* check_format */
+   default_core_sniffer,			/* core_sniffer */
+   fetch_core_registers,			/* core_read_registers */
+   NULL					/* next */
+ };
+ 
+ static struct core_fns alphanbsd_elfcore_fns =
+ {
+   bfd_target_elf_flavour,		/* core_flavour */
+   default_check_format,			/* check_format */
+   default_core_sniffer,			/* core_sniffer */
+   fetch_elfcore_registers,		/* core_read_registers */
+   NULL					/* next */
+ };
+ 
+ void
+ _initialize_alphanbsd_nat (void)
+ {
+   add_core_fns (&alphanbsd_core_fns);
+   add_core_fns (&alphanbsd_elfcore_fns);
+ }
Index: configure.host
===================================================================
RCS file: /cvs/src/src/gdb/configure.host,v
retrieving revision 1.31
diff -c -r1.31 configure.host
*** configure.host	2001/12/17 16:23:02	1.31
--- configure.host	2002/01/18 06:27:16
***************
*** 33,38 ****
--- 33,39 ----
  alpha*-*-osf[3456789]*)	gdb_host=alpha-osf3 ;;
  alpha*-*-linux*)	gdb_host=alpha-linux ;;
  alpha*-*-freebsd*)	gdb_host=fbsd ;;
+ alpha*-*-netbsd*)	gdb_host=nbsd ;;
  
  arm*-*-linux*)		gdb_host=linux ;;
  arm*-*-netbsd*)		gdb_host=nbsd ;;
Index: configure.tgt
===================================================================
RCS file: /cvs/src/src/gdb/configure.tgt,v
retrieving revision 1.49
diff -c -r1.49 configure.tgt
*** configure.tgt	2002/01/15 01:52:37	1.49
--- configure.tgt	2002/01/18 06:27:16
***************
*** 47,52 ****
--- 47,53 ----
  alpha*-*-osf*)		gdb_target=alpha-osf1 ;;
  alpha*-*-linux*)	gdb_target=alpha-linux ;;
  alpha*-*-freebsd*)	gdb_target=fbsd ;;
+ alpha*-*-netbsd*)	gdb_target=nbsd ;;
  
  arc-*-*)		gdb_target=arc ;;
  
Index: config/nm-nbsd.h
===================================================================
RCS file: /cvs/src/src/gdb/config/nm-nbsd.h,v
retrieving revision 1.1.1.3
diff -c -r1.1.1.3 nm-nbsd.h
*** nm-nbsd.h	1999/12/14 01:05:40	1.1.1.3
--- nm-nbsd.h	2002/01/18 06:27:16
***************
*** 18,30 ****
     Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.  */
  
- /* This is the amount to subtract from u.u_ar0
-    to get the offset in the core file of the register values.  */
- 
- #include <machine/vmparam.h>
- 
- #define KERNEL_U_ADDR USRSTACK
- 
  #define PTRACE_ARG3_TYPE char*
  
  #define FETCH_INFERIOR_REGISTERS
--- 18,23 ----
Index: config/alpha/nbsd.mh
===================================================================
RCS file: nbsd.mh
diff -N nbsd.mh
*** /dev/null	Tue May  5 13:32:27 1998
--- nbsd.mh	Thu Jan 17 22:27:16 2002
***************
*** 0 ****
--- 1,6 ----
+ # Host: Alpha running NetBSD
+ XDEPFILES=
+ NAT_CLIBS=
+ NATDEPFILES= infptrace.o inftarg.o fork-child.o corelow.o alphabsd-nat.o alphanbsd-nat.o solib.o solib-svr4.o solib-legacy.o
+ XM_FILE= xm-nbsd.h
+ NAT_FILE= nm-nbsd.h
Index: config/alpha/nbsd.mt
===================================================================
RCS file: nbsd.mt
diff -N nbsd.mt
*** /dev/null	Tue May  5 13:32:27 1998
--- nbsd.mt	Thu Jan 17 22:27:16 2002
***************
*** 0 ****
--- 1,3 ----
+ # Target: Alpha running NetBSD
+ TDEPFILES= alpha-tdep.o
+ TM_FILE= tm-nbsd.h
Index: config/alpha/nm-nbsd.h
===================================================================
RCS file: nm-nbsd.h
diff -N nm-nbsd.h
*** /dev/null	Tue May  5 13:32:27 1998
--- nm-nbsd.h	Thu Jan 17 22:27:16 2002
***************
*** 0 ****
--- 1,36 ----
+ /* Native-dependent definitions for Alpha running NetBSD, for GDB.
+    Copyright 2002 Free Software Foundation, Inc.
+    Contributed by Wasabi Systems, Inc.
+ 
+    This file is part of GDB.
+ 
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+ 
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.  */
+ 
+ #ifndef NM_NBSD_H
+ #define NM_NBSD_H
+ 
+ #define SVR4_SHARED_LIBS
+ 
+ /* Get generic NetBSD native definitions.  */
+ #include "config/nm-nbsd.h"
+ 
+ /* The Alpha does not step over a breakpoint.  */
+ #define CANNOT_STEP_BREAKPOINT
+ 
+ /* NetBSD/alpha has shared libraries.  */
+ #define GDB_TARGET_HAS_SHARED_LIBS
+ 
+ #endif /* NM_NBSD_H */
Index: config/alpha/tm-alpha.h
===================================================================
RCS file: /cvs/src/src/gdb/config/alpha/tm-alpha.h,v
retrieving revision 1.7
diff -c -r1.7 tm-alpha.h
*** tm-alpha.h	2001/12/15 16:53:23	1.7
--- tm-alpha.h	2002/01/18 06:27:17
***************
*** 474,477 ****
--- 474,480 ----
  extern CORE_ADDR alpha_osf_skip_sigtramp_frame (struct frame_info *,
  						CORE_ADDR);
  
+ /* Single step based on where the current instruction will take us.  */
+ extern void alpha_software_single_step (enum target_signal, int);
+ 
  #endif /* TM_ALPHA_H */
Index: config/alpha/tm-nbsd.h
===================================================================
RCS file: tm-nbsd.h
diff -N tm-nbsd.h
*** /dev/null	Tue May  5 13:32:27 1998
--- tm-nbsd.h	Thu Jan 17 22:27:17 2002
***************
*** 0 ****
--- 1,45 ----
+ /* Macro definitions for Alpha running under NetBSD.
+    Copyright 2002 Free Software Foundation, Inc.
+    Contributed by Wasabi Systems, 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 TM_NBSD_H
+ #define TM_NBSD_H
+ 
+ #include "alpha/tm-alpha.h"
+ #include "config/tm-nbsd.h"
+ 
+ /* NetBSD does not mark the outermost frame.  Instead, we consider the
+    the entry point as the outermost frame.  */
+ #define FRAME_CHAIN_VALID(chain, thisframe) \
+   func_frame_chain_valid(chain, thisframe)
+ 
+ /* NetBSD/alpha does not provide single step support via ptrace(2); we
+    must use software single-stepping.  */
+ #define SOFTWARE_SINGLE_STEP_P() 1
+ #define SOFTWARE_SINGLE_STEP(sig,bpt) alpha_software_single_step((sig), (bpt))
+ 
+ /* Use the default in inferior.h  */
+ #undef START_INFERIOR_TRAPS_EXPECTED
+ 
+ /* NetBSD/alpha's userland entry point is __start.  solib-svr4.c looks
+    for _start.  */
+ #define SOLIB_BKPT_NAME "__start"
+ 
+ #endif /* TM_NBSD_H */
Index: config/alpha/xm-nbsd.h
===================================================================
RCS file: xm-nbsd.h
diff -N xm-nbsd.h
*** /dev/null	Tue May  5 13:32:27 1998
--- xm-nbsd.h	Thu Jan 17 22:27:17 2002
***************
*** 0 ****
--- 1,23 ----
+ /* Parameters for execution on an Alpha running NetBSD, for GDB.
+    Copyright 2002 Free Software Foundation, Inc.
+    Contributed by Wasabi Systems, 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.  */
+ 
+ /* Get generic NetBSD host definitions.  */
+ #include "config/xm-nbsd.h"