Normalize names of the NetBSD files

The files used to be named 'nbsd', which incorrectly reflects
the name of the OS and confuses it with other BSD derived OSes.

gdb/ChangeLog:

        * Makefile.in (ALL_64_TARGET_OBS, ALL_TARGET_OBS)
        HFILES_NO_SRCDIR, ALLDEPFILES): Rename files.
        * alpha-bsd-nat.c: Adjust include.
        * alpha-bsd-tdep.h: Adjust comment.
        * alpha-nbsd-tdep.c: Rename to ...
        * alpha-netbsd-tdep.c: ... this, adjust include.
        * amd64-nbsd-nat.c: Rename to ...
        * amd64-netbsd-nat.c: ... this, adjust include.
        * amd64-nbsd-tdep.c: Rename to ...
        * amd64-netbsd-tdep.c: ... this, adjust include.
        * amd64-tdep.h: Adjust include.
        * arm-nbsd-nat.c: Rename to ...
        * arm-netbsd-nat.c: ... this, adjust include.
        * arm-nbsd-tdep.c: Rename to ...
        * arm-netbsd-tdep.c: ... this, adjust include.
        * arm-nbsd-tdep.h: Rename to ...
        * arm-netbsd-tdep.h: ... this, adjust include.
        * configure.nat: Adjust file lists.
        * configure.tgt: Likewise.
        * hppa-nbsd-nat.c: Rename to ...
        * hppa-netbsd-nat.c: ... this, adjust include.
        * hppa-nbsd-tdep.c: Rename to ...
        * hppa-netbsd-tdep.c: ... this, adjust include.
        * i386-nbsd-nat.c: Rename to ...
        * i386-netbsd-nat.c: ... this, adjust include.
        * i386-nbsd-tdep.c: Rename to ...
        * i386-netbsd-tdep.c: ... this, adjust include.
        * m68k-bsd-nat.c: Adjust include.
        * mips-nbsd-nat.c: Rename to ...
        * mips-netbsd-nat.c: ... this, adjust include.
        * mips-nbsd-tdep.c: Rename to ...
        * mips-netbsd-tdep.c: ... this, adjust include.
        * mips-nbsd-tdep.h: Rename to ...
        * mips-netbsd-tdep.h: ... this.
        * nbsd-nat.c: Rename to ...
        * netbsd-nat.c: ... this, adjust include.
        * nbsd-nat.h: Rename to ...
        * netbsd-nat.h: ... this, adjust include.
        * nbsd-tdep.c: Rename to ...
        * netbsd-tdep.c: ... this, adjust include.
        * nbsd-tdep.h: Rename to ...
        * netbsd-tdep.h: ... this.
        * ppc-nbsd-nat.c: Rename to ...
        * ppc-netbsd-nat.c: ... this, adjust include.
        * ppc-nbsd-tdep.c: Rename to ...
        * ppc-netbsd-tdep.c: ... this, adjust include and comment.
        * ppc-nbsd-tdep.h: Rename to ...
        * ppc-netbsd-tdep.h: ... this.
        * sh-nbsd-nat.c: Rename to ...
        * sh-netbsd-nat.c: ... this, adjust include.
        * sh-nbsd-tdep.c: Rename to ...
        * sh-netbsd-tdep.c: ... this, adjust include.
        * sparc-nbsd-nat.c: Rename to ...
        * sparc-netbsd-nat.c: ... this.
        * sparc-nbsd-tdep.c: Rename to ...
        * sparc-netbsd-tdep.c: ... this, adjust include.
        * sparc64-nbsd-nat.c: Rename to ...
        * sparc64-netbsd-nat.c: ... this.
        * sparc64-nbsd-tdep.c: Rename to ...
        * sparc64-netbsd-tdep.c: ... this, adjust include.
        * sparc64-tdep.h: Adjust comment.
        * vax-bsd-nat.c: Adjust include.
        * vax-nbsd-tdep.c: Rename to ...
        * vax-netbsd-tdep.c: ... this, adjust include.

1 files changed, 292 insertions, 0 deletions

diff --git a/gdb/alpha-netbsd-tdep.c b/gdb/alpha-netbsd-tdep.c
new file mode 100644
index 0000000..c78e496
--- /dev/null
+++ b/gdb/alpha-netbsd-tdep.c
@@ -0,0 +1,292 @@
+/* Target-dependent code for NetBSD/alpha.
+
+   Copyright (C) 2002-2020 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 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "value.h"
+
+#include "alpha-tdep.h"
+#include "alpha-bsd-tdep.h"
+#include "netbsd-tdep.h"
+#include "solib-svr4.h"
+#include "target.h"
+
+/* Core file support.  */
+
+/* Sizeof `struct reg' in <machine/reg.h>.  */
+#define ALPHANBSD_SIZEOF_GREGS	(32 * 8)
+
+/* Sizeof `struct fpreg' in <machine/reg.h.  */
+#define ALPHANBSD_SIZEOF_FPREGS	((32 * 8) + 8)
+
+/* Supply register REGNUM from the buffer specified by FPREGS and LEN
+   in the floating-point register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+alphanbsd_supply_fpregset (const struct regset *regset,
+			   struct regcache *regcache,
+			   int regnum, const void *fpregs, size_t len)
+{
+  const gdb_byte *regs = (const gdb_byte *) fpregs;
+  int i;
+
+  gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
+
+  for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache->raw_supply (i, regs + (i - ALPHA_FP0_REGNUM) * 8);
+    }
+
+  if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
+    regcache->raw_supply (ALPHA_FPCR_REGNUM, regs + 32 * 8);
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+   in the general-purpose register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+alphanbsd_aout_supply_gregset (const struct regset *regset,
+			       struct regcache *regcache,
+			       int regnum, const void *gregs, size_t len)
+{
+  const gdb_byte *regs = (const gdb_byte *) gregs;
+  int i;
+
+  /* Table to map a GDB register number to a trapframe register index.  */
+  static const int regmap[] =
+  {
+     0,   1,   2,   3,
+     4,   5,   6,   7,
+     8,   9,  10,  11,
+    12,  13,  14,  15, 
+    30,  31,  32,  16, 
+    17,  18,  19,  20,
+    21,  22,  23,  24,
+    25,  29,  26
+  };
+
+  gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
+
+  for (i = 0; i < ARRAY_SIZE(regmap); i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache->raw_supply (i, regs + regmap[i] * 8);
+    }
+
+  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+    regcache->raw_supply (ALPHA_PC_REGNUM, regs + 31 * 8);
+
+  if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
+    {
+      regs += ALPHANBSD_SIZEOF_GREGS;
+      len -= ALPHANBSD_SIZEOF_GREGS;
+      alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
+    }
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+   in the general-purpose register set REGSET to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+static void
+alphanbsd_supply_gregset (const struct regset *regset,
+			  struct regcache *regcache,
+			  int regnum, const void *gregs, size_t len)
+{
+  const gdb_byte *regs = (const gdb_byte *) gregs;
+  int i;
+
+  if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
+    {
+      alphanbsd_aout_supply_gregset (regset, regcache, regnum, gregs, len);
+      return;
+    }
+
+  for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
+    {
+      if (regnum == i || regnum == -1)
+	regcache->raw_supply (i, regs + i * 8);
+    }
+
+  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+    regcache->raw_supply (ALPHA_PC_REGNUM, regs + 31 * 8);
+}
+
+/* NetBSD/alpha register sets.  */
+
+static const struct regset alphanbsd_gregset =
+{
+  NULL,
+  alphanbsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
+};
+
+static const struct regset alphanbsd_fpregset =
+{
+  NULL,
+  alphanbsd_supply_fpregset
+};
+
+/* Iterate over supported core file register note sections. */
+
+void
+alphanbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
+					iterate_over_regset_sections_cb *cb,
+					void *cb_data,
+					const struct regcache *regcache)
+{
+  cb (".reg", ALPHANBSD_SIZEOF_GREGS, ALPHANBSD_SIZEOF_GREGS,
+      &alphanbsd_gregset, NULL, cb_data);
+  cb (".reg2", ALPHANBSD_SIZEOF_FPREGS, ALPHANBSD_SIZEOF_FPREGS,
+      &alphanbsd_fpregset, NULL, cb_data);
+}
+
+
+/* Signal trampolines.  */
+
+/* Under NetBSD/alpha, signal handler invocations can be identified by the
+   designated code sequence that is used to return from a signal handler.
+   In particular, the return address of a signal handler points to the
+   following code sequence:
+
+	ldq	a0, 0(sp)
+	lda	sp, 16(sp)
+	lda	v0, 295(zero)	# __sigreturn14
+	call_pal callsys
+
+   Each instruction has a unique encoding, so we simply attempt to match
+   the instruction the PC is pointing to with any of the above instructions.
+   If there is a hit, we know the offset to the start of the designated
+   sequence and can then check whether we really are executing in the
+   signal trampoline.  If not, -1 is returned, otherwise the offset from the
+   start of the return sequence is returned.  */
+static const gdb_byte sigtramp_retcode[] =
+{
+  0x00, 0x00, 0x1e, 0xa6,	/* ldq a0, 0(sp) */
+  0x10, 0x00, 0xde, 0x23,	/* lda sp, 16(sp) */
+  0x27, 0x01, 0x1f, 0x20,	/* lda v0, 295(zero) */
+  0x83, 0x00, 0x00, 0x00,	/* call_pal callsys */
+};
+#define RETCODE_NWORDS		4
+#define RETCODE_SIZE		(RETCODE_NWORDS * 4)
+
+static LONGEST
+alphanbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  gdb_byte ret[RETCODE_SIZE], w[4];
+  LONGEST off;
+  int i;
+
+  if (target_read_memory (pc, w, 4) != 0)
+    return -1;
+
+  for (i = 0; i < RETCODE_NWORDS; i++)
+    {
+      if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
+	break;
+    }
+  if (i == RETCODE_NWORDS)
+    return (-1);
+
+  off = i * 4;
+  pc -= off;
+
+  if (target_read_memory (pc, ret, sizeof (ret)) != 0)
+    return -1;
+
+  if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
+    return off;
+
+  return -1;
+}
+
+static int
+alphanbsd_pc_in_sigtramp (struct gdbarch *gdbarch,
+		 	  CORE_ADDR pc, const char *func_name)
+{
+  return (nbsd_pc_in_sigtramp (pc, func_name)
+	  || alphanbsd_sigtramp_offset (gdbarch, pc) >= 0);
+}
+
+static CORE_ADDR
+alphanbsd_sigcontext_addr (struct frame_info *frame)
+{
+  /* FIXME: This is not correct for all versions of NetBSD/alpha.
+     We will probably need to disassemble the trampoline to figure
+     out which trampoline frame type we have.  */
+  if (!get_next_frame (frame))
+    return 0;
+  return get_frame_base (get_next_frame (frame));
+}
+
+
+static void
+alphanbsd_init_abi (struct gdbarch_info info,
+                    struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Hook into the DWARF CFI frame unwinder.  */
+  alpha_dwarf2_init_abi (info, gdbarch);
+
+  /* Hook into the MDEBUG frame unwinder.  */
+  alpha_mdebug_init_abi (info, gdbarch);
+
+  nbsd_init_abi (info, gdbarch);
+
+  /* NetBSD/alpha does not provide single step support via ptrace(2); we
+     must use software single-stepping.  */
+  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
+
+  /* NetBSD/alpha has SVR4-style shared libraries.  */
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+  tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
+  tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
+  tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
+
+  tdep->jb_pc = 2;
+  tdep->jb_elt_size = 8;
+
+  set_gdbarch_iterate_over_regset_sections
+    (gdbarch, alphanbsd_iterate_over_regset_sections);
+}
+
+
+void _initialize_alphanbsd_tdep ();
+void
+_initialize_alphanbsd_tdep ()
+{
+  /* Even though NetBSD/alpha used ELF since day one, it used the
+     traditional a.out-style core dump format before NetBSD 1.6, but
+     we don't support those.  */
+  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD,
+                          alphanbsd_init_abi);
+}