* NEWS: Note new MIPS NetBSD native configuration.

* configure.host (mips*-*-netbsd*): New host.
* configure.tgt (mips*-*-netbsd*): New target.
* mipsnbsd-nat.c: New file.
* mipsnbsd-tdep.c: New file.
* mipsnbsd-tdep.h: New file.
* config/mips/nbsd.mh: New file.
* config/mips/nbsd.mt: New file.
* config/mips/nm-nbsd.h: New file.
* config/mips/tm-nbsd.h: New file.

1 files changed, 367 insertions, 0 deletions

diff --git a/gdb/mipsnbsd-tdep.c b/gdb/mipsnbsd-tdep.c
new file mode 100644
index 00000000000..029ae6f28bc
--- /dev/null
+++ b/gdb/mipsnbsd-tdep.c
@@ -0,0 +1,367 @@
+/* Target-dependent code for MIPS systems running 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 "gdbcore.h"
+#include "regcache.h"
+#include "target.h"
+#include "value.h"
+#include "osabi.h"
+
+#include "mipsnbsd-tdep.h"
+
+#include "solib-svr4.h"
+
+/* Conveniently, GDB uses the same register numbering as the
+   ptrace register structure used by NetBSD/mips.  */
+
+void
+mipsnbsd_supply_reg (char *regs, int regno)
+{
+  int i;
+
+  for (i = 0; i <= PC_REGNUM; i++)
+    {
+      if (regno == i || regno == -1)
+	{
+	  if (CANNOT_FETCH_REGISTER (i))
+	    supply_register (i, NULL);
+	  else
+            supply_register (i, regs + (i * MIPS_REGSIZE));
+        }
+    }
+}
+
+void
+mipsnbsd_fill_reg (char *regs, int regno)
+{
+  int i;
+
+  for (i = 0; i <= PC_REGNUM; i++)
+    if ((regno == i || regno == -1) && ! CANNOT_STORE_REGISTER (i))
+      regcache_collect (i, regs + (i * MIPS_REGSIZE));
+}
+
+void
+mipsnbsd_supply_fpreg (char *fpregs, int regno)
+{
+  int i;
+
+  for (i = FP0_REGNUM; i <= FCRIR_REGNUM; i++)
+    {
+      if (regno == i || regno == -1)
+	{
+	  if (CANNOT_FETCH_REGISTER (i))
+	    supply_register (i, NULL);
+	  else
+            supply_register (i, fpregs + ((i - FP0_REGNUM) * MIPS_REGSIZE));
+	}
+    }
+}
+
+void
+mipsnbsd_fill_fpreg (char *fpregs, int regno)
+{
+  int i;
+
+  for (i = FP0_REGNUM; i <= FCRCS_REGNUM; i++)
+    if ((regno == i || regno == -1) && ! CANNOT_STORE_REGISTER (i))
+      regcache_collect (i, fpregs + ((i - FP0_REGNUM) * MIPS_REGSIZE));
+}
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
+                      CORE_ADDR ignore)
+{
+  char *regs, *fpregs;
+
+  /* We get everything from one section.  */
+  if (which != 0)
+    return;
+
+  regs = core_reg_sect;
+  fpregs = core_reg_sect + SIZEOF_STRUCT_REG;
+
+  /* Integer registers.  */
+  mipsnbsd_supply_reg (regs, -1);
+
+  /* Floating point registers.  */
+  mipsnbsd_supply_fpreg (regs, -1);
+}
+
+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
+	mipsnbsd_supply_reg (core_reg_sect, -1);
+      break;
+
+    case 2:  /* Floating point registers.  */
+      if (core_reg_size != SIZEOF_STRUCT_FPREG)
+	warning ("Wrong size register set in core file.");
+      else
+	mipsnbsd_supply_fpreg (core_reg_sect, -1);
+      break;
+
+    default:
+      /* Don't know what kind of register request this is; just ignore it.  */
+      break;
+    }
+}
+
+static struct core_fns mipsnbsd_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 mipsnbsd_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 */
+};
+
+/* Under NetBSD/mips, 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:
+
+	addu	a0, sp, 16
+	li	v0, 295			# __sigreturn14
+	syscall
+   
+   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.  */
+
+#define RETCODE_NWORDS	3
+#define RETCODE_SIZE	(RETCODE_NWORDS * 4)
+
+static const unsigned char sigtramp_retcode_mipsel[RETCODE_SIZE] =
+{
+  0x10, 0x00, 0xa4, 0x27,	/* addu a0, sp, 16 */
+  0x27, 0x01, 0x02, 0x24,	/* li v0, 295 */
+  0x0c, 0x00, 0x00, 0x00,	/* syscall */
+};
+
+static const unsigned char sigtramp_retcode_mipseb[RETCODE_SIZE] =
+{
+  0x27, 0xa4, 0x00, 0x10,	/* addu a0, sp, 16 */
+  0x24, 0x02, 0x01, 0x27,	/* li v0, 295 */
+  0x00, 0x00, 0x00, 0x0c,	/* syscall */
+};
+
+static LONGEST
+mipsnbsd_sigtramp_offset (CORE_ADDR pc)
+{
+  const char *retcode = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+  	? sigtramp_retcode_mipseb : sigtramp_retcode_mipsel;
+  unsigned char ret[RETCODE_SIZE], w[4];
+  LONGEST off;
+  int i;
+
+  if (read_memory_nobpt (pc, (char *) w, sizeof (w)) != 0)
+    return -1;
+
+  for (i = 0; i < RETCODE_NWORDS; i++)
+    {
+      if (memcmp (w, retcode + (i * 4), 4) == 0)
+	break;
+    }
+  if (i == RETCODE_NWORDS)
+    return -1;
+
+  off = i * 4;
+  pc -= off;
+
+  if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
+    return -1;
+
+  if (memcmp (ret, retcode, RETCODE_SIZE) == 0)
+    return off;
+
+  return -1;
+}
+
+static int
+mipsnbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
+{
+  return (mipsnbsd_sigtramp_offset (pc) >= 0);
+}
+
+/* Figure out where the longjmp will land.  We expect that we have
+   just entered longjmp and haven't yet setup the stack frame, so
+   the args are still in the argument regs.  A0_REGNUM points at the
+   jmp_buf structure from which we extract the PC that we will land
+   at.  The PC is copied into *pc.  This routine returns true on
+   success.  */
+
+#define NBSD_MIPS_JB_PC			(2 * 4)
+#define NBSD_MIPS_JB_ELEMENT_SIZE	MIPS_REGSIZE
+#define NBSD_MIPS_JB_OFFSET		(NBSD_MIPS_JB_PC * \
+					 NBSD_MIPS_JB_ELEMENT_SIZE)
+
+static int
+mipsnbsd_get_longjmp_target (CORE_ADDR *pc)
+{
+  CORE_ADDR jb_addr;
+  char *buf;
+
+  buf = alloca (NBSD_MIPS_JB_ELEMENT_SIZE);
+
+  jb_addr = read_register (A0_REGNUM);
+
+  if (target_read_memory (jb_addr + NBSD_MIPS_JB_OFFSET, buf,
+  			  NBSD_MIPS_JB_ELEMENT_SIZE))
+    return 0;
+
+  *pc = extract_address (buf, NBSD_MIPS_JB_ELEMENT_SIZE);
+
+  return 1;
+}
+
+static int
+mipsnbsd_cannot_fetch_register (int regno)
+{
+  return (regno >= FP_REGNUM
+  	  || regno == ZERO_REGNUM
+	  || regno == FCRIR_REGNUM);
+}
+
+static int
+mipsnbsd_cannot_store_register (int regno)
+{
+  return (regno >= FP_REGNUM
+	  || regno == ZERO_REGNUM
+	  || regno == FCRIR_REGNUM);
+}
+
+/* NetBSD/mips uses a slightly different link_map structure from the
+   other NetBSD platforms.  */
+static struct link_map_offsets *
+mipsnbsd_ilp32_solib_svr4_fetch_link_map_offsets (void)
+{
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL) 
+    {
+      lmp = &lmo;
+
+      lmo.r_debug_size = 16;
+
+      lmo.r_map_offset = 4;
+      lmo.r_map_size   = 4;
+
+      lmo.link_map_size = 24;
+
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size   = 4;
+
+      lmo.l_name_offset = 8;
+      lmo.l_name_size   = 4;
+
+      lmo.l_next_offset = 16;
+      lmo.l_next_size   = 4;
+
+      lmo.l_prev_offset = 20;
+      lmo.l_prev_size   = 4;
+    }
+
+  return lmp;
+}
+
+static struct link_map_offsets *
+mipsnbsd_lp64_solib_svr4_fetch_link_map_offsets (void)
+{
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL)
+    {
+      lmp = &lmo;
+
+      lmo.r_debug_size = 32;
+
+      lmo.r_map_offset = 8;  
+      lmo.r_map_size   = 8;
+
+      lmo.link_map_size = 48;
+
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size   = 8;
+
+      lmo.l_name_offset = 16; 
+      lmo.l_name_size   = 8;
+
+      lmo.l_next_offset = 32;
+      lmo.l_next_size   = 8;
+
+      lmo.l_prev_offset = 40;
+      lmo.l_prev_size   = 8;
+    }
+
+  return lmp;
+}
+
+static void
+mipsnbsd_init_abi (struct gdbarch_info info,
+                   struct gdbarch *gdbarch)
+{
+  set_gdbarch_pc_in_sigtramp (gdbarch, mipsnbsd_pc_in_sigtramp);
+
+  set_gdbarch_get_longjmp_target (gdbarch, mipsnbsd_get_longjmp_target);
+
+  set_gdbarch_cannot_fetch_register (gdbarch, mipsnbsd_cannot_fetch_register);
+  set_gdbarch_cannot_store_register (gdbarch, mipsnbsd_cannot_store_register);
+
+  set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
+
+  set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					 gdbarch_ptr_bit (gdbarch) == 32 ?
+                            mipsnbsd_ilp32_solib_svr4_fetch_link_map_offsets :
+			    mipsnbsd_lp64_solib_svr4_fetch_link_map_offsets);
+}
+
+void
+_initialize_mipsnbsd_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_mips, GDB_OSABI_NETBSD_ELF,
+			  mipsnbsd_init_abi);
+
+  add_core_fns (&mipsnbsd_core_fns);
+  add_core_fns (&mipsnbsd_elfcore_fns);
+}