gdb/doc/

[binutils-gdb.git] / gdb / mips-linux-tdep.c

diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
index 2407cc7c21f76bbc6e07e6bbe349dfd2c4aa793c..5924b30984db3d95f2219f18082da3c3b1de7c98 100644 (file)
--- a/gdb/mips-linux-tdep.c
+++ b/gdb/mips-linux-tdep.c
@@ -1,13 +1,13 @@
 /* Target-dependent code for GNU/Linux on MIPS processors.
 
 /* Target-dependent code for GNU/Linux on MIPS processors.
 

-   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007
+   Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010

    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
    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
+   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,
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,


@@ -16,9 +16,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    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., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 #include "defs.h"
 #include "gdbcore.h"
 
 #include "defs.h"
 #include "gdbcore.h"


@@ -34,8 +32,14 @@
 #include "tramp-frame.h"
 #include "gdbtypes.h"
 #include "solib.h"
 #include "tramp-frame.h"
 #include "gdbtypes.h"
 #include "solib.h"

+#include "solib-svr4.h"
+#include "solist.h"

 #include "symtab.h"
 #include "symtab.h"

+#include "target-descriptions.h"

 #include "mips-linux-tdep.h"
 #include "mips-linux-tdep.h"

+#include "glibc-tdep.h"
+
+static struct target_so_ops mips_svr4_so_ops;

 
 /* Figure out where the longjmp will land.
    We expect the first arg to be a pointer to the jmp_buf structure
 
 /* Figure out where the longjmp will land.
    We expect the first arg to be a pointer to the jmp_buf structure


@@ -47,19 +51,23 @@
 #define MIPS_LINUX_JB_PC 0
 
 static int
 #define MIPS_LINUX_JB_PC 0
 
 static int

-mips_linux_get_longjmp_target (CORE_ADDR *pc)
+mips_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)

 {
   CORE_ADDR jb_addr;
 {
   CORE_ADDR jb_addr;

-  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  char buf[gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT];

 
 

-  jb_addr = read_register (MIPS_A0_REGNUM);
+  jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM);

 
   if (target_read_memory (jb_addr
 
   if (target_read_memory (jb_addr

-                         + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
-                         buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
+                           + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
+                         buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT))

     return 0;
 
     return 0;
 

-  *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+  *pc = extract_unsigned_integer (buf,
+                                 gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT,
+                                 byte_order);

 
   return 1;
 }
 
   return 1;
 }


@@ -71,9 +79,11 @@ mips_linux_get_longjmp_target (CORE_ADDR *pc)
 static void
 supply_32bit_reg (struct regcache *regcache, int regnum, const void *addr)
 {
 static void
 supply_32bit_reg (struct regcache *regcache, int regnum, const void *addr)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

   gdb_byte buf[MAX_REGISTER_SIZE];
   gdb_byte buf[MAX_REGISTER_SIZE];

-  store_signed_integer (buf, register_size (current_gdbarch, regnum),
-                        extract_signed_integer (addr, 4));
+  store_signed_integer (buf, register_size (gdbarch, regnum), byte_order,
+                        extract_signed_integer (addr, 4, byte_order));

   regcache_raw_supply (regcache, regnum, buf);
 }
 
   regcache_raw_supply (regcache, regnum, buf);
 }
 


@@ -86,29 +96,32 @@ mips_supply_gregset (struct regcache *regcache,
   int regi;
   const mips_elf_greg_t *regp = *gregsetp;
   char zerobuf[MAX_REGISTER_SIZE];
   int regi;
   const mips_elf_greg_t *regp = *gregsetp;
   char zerobuf[MAX_REGISTER_SIZE];

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 
 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 

-  for (regi = EF_REG0; regi <= EF_REG31; regi++)
+  for (regi = EF_REG0 + 1; regi <= EF_REG31; regi++)

     supply_32bit_reg (regcache, regi - EF_REG0, regp + regi);
 
     supply_32bit_reg (regcache, regi - EF_REG0, regp + regi);
 

-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->lo,
-                   regp + EF_LO);
-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->hi,
-                   regp + EF_HI);
+  if (mips_linux_restart_reg_p (gdbarch))
+    supply_32bit_reg (regcache, MIPS_RESTART_REGNUM, regp + EF_REG0);

 
 

-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->pc,
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->lo, regp + EF_LO);
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->hi, regp + EF_HI);
+
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->pc,

                    regp + EF_CP0_EPC);
                    regp + EF_CP0_EPC);

-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->badvaddr,
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->badvaddr,

                    regp + EF_CP0_BADVADDR);
   supply_32bit_reg (regcache, MIPS_PS_REGNUM, regp + EF_CP0_STATUS);
                    regp + EF_CP0_BADVADDR);
   supply_32bit_reg (regcache, MIPS_PS_REGNUM, regp + EF_CP0_STATUS);

-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->cause,
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->cause,

                    regp + EF_CP0_CAUSE);
 
   /* Fill inaccessible registers with zero.  */
                    regp + EF_CP0_CAUSE);
 
   /* Fill inaccessible registers with zero.  */

+  regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf);

   regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
   for (regi = MIPS_FIRST_EMBED_REGNUM;
   regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
   for (regi = MIPS_FIRST_EMBED_REGNUM;

-       regi < MIPS_LAST_EMBED_REGNUM;
+       regi <= MIPS_LAST_EMBED_REGNUM;

        regi++)
     regcache_raw_supply (regcache, regi, zerobuf);
 }
        regi++)
     regcache_raw_supply (regcache, regi, zerobuf);
 }


@@ -119,6 +132,7 @@ void
 mips_fill_gregset (const struct regcache *regcache,
                   mips_elf_gregset_t *gregsetp, int regno)
 {
 mips_fill_gregset (const struct regcache *regcache,
                   mips_elf_gregset_t *gregsetp, int regno)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

   int regaddr, regi;
   mips_elf_greg_t *regp = *gregsetp;
   void *dst;
   int regaddr, regi;
   mips_elf_greg_t *regp = *gregsetp;
   void *dst;


@@ -126,41 +140,40 @@ mips_fill_gregset (const struct regcache *regcache,
   if (regno == -1)
     {
       memset (regp, 0, sizeof (mips_elf_gregset_t));
   if (regno == -1)
     {
       memset (regp, 0, sizeof (mips_elf_gregset_t));

-      for (regi = 0; regi < 32; regi++)
+      for (regi = 1; regi < 32; regi++)

        mips_fill_gregset (regcache, gregsetp, regi);
        mips_fill_gregset (regcache, gregsetp, regi);

-      mips_fill_gregset (regcache, gregsetp,
-                        mips_regnum (current_gdbarch)->lo);
-      mips_fill_gregset (regcache, gregsetp,
-                        mips_regnum (current_gdbarch)->hi);
-      mips_fill_gregset (regcache, gregsetp,
-                        mips_regnum (current_gdbarch)->pc);
-      mips_fill_gregset (regcache, gregsetp,
-                        mips_regnum (current_gdbarch)->badvaddr);
+      mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo);
+      mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi);
+      mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc);
+      mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->badvaddr);

       mips_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);
       mips_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);

-      mips_fill_gregset (regcache, gregsetp,
-                        mips_regnum (current_gdbarch)->cause);
+      mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->cause);
+      mips_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM);

       return;
    }
 
       return;
    }
 

-  if (regno < 32)
+  if (regno > 0 && regno < 32)

     {
       dst = regp + regno + EF_REG0;
       regcache_raw_collect (regcache, regno, dst);
       return;
     }
 
     {
       dst = regp + regno + EF_REG0;
       regcache_raw_collect (regcache, regno, dst);
       return;
     }
 

-  if (regno == mips_regnum (current_gdbarch)->lo)
-    regaddr = EF_LO;
-  else if (regno == mips_regnum (current_gdbarch)->hi)
+  if (regno == mips_regnum (gdbarch)->lo)
+     regaddr = EF_LO;
+  else if (regno == mips_regnum (gdbarch)->hi)

     regaddr = EF_HI;
     regaddr = EF_HI;

-  else if (regno == mips_regnum (current_gdbarch)->pc)
+  else if (regno == mips_regnum (gdbarch)->pc)

     regaddr = EF_CP0_EPC;
     regaddr = EF_CP0_EPC;

-  else if (regno == mips_regnum (current_gdbarch)->badvaddr)
+  else if (regno == mips_regnum (gdbarch)->badvaddr)

     regaddr = EF_CP0_BADVADDR;
   else if (regno == MIPS_PS_REGNUM)
     regaddr = EF_CP0_STATUS;
     regaddr = EF_CP0_BADVADDR;
   else if (regno == MIPS_PS_REGNUM)
     regaddr = EF_CP0_STATUS;

-  else if (regno == mips_regnum (current_gdbarch)->cause)
+  else if (regno == mips_regnum (gdbarch)->cause)

     regaddr = EF_CP0_CAUSE;
     regaddr = EF_CP0_CAUSE;

+  else if (mips_linux_restart_reg_p (gdbarch)
+          && regno == MIPS_RESTART_REGNUM)
+    regaddr = EF_REG0;

   else
     regaddr = -1;
 
   else
     regaddr = -1;
 


@@ -177,21 +190,24 @@ void
 mips_supply_fpregset (struct regcache *regcache,
                      const mips_elf_fpregset_t *fpregsetp)
 {
 mips_supply_fpregset (struct regcache *regcache,
                      const mips_elf_fpregset_t *fpregsetp)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

   int regi;
   char zerobuf[MAX_REGISTER_SIZE];
 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 
   for (regi = 0; regi < 32; regi++)
   int regi;
   char zerobuf[MAX_REGISTER_SIZE];
 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 
   for (regi = 0; regi < 32; regi++)

-    regcache_raw_supply (regcache, FP0_REGNUM + regi, *fpregsetp + regi);
+    regcache_raw_supply (regcache,
+                        gdbarch_fp0_regnum (gdbarch) + regi,
+                        *fpregsetp + regi);

 
   regcache_raw_supply (regcache,
 
   regcache_raw_supply (regcache,

-                      mips_regnum (current_gdbarch)->fp_control_status,
+                      mips_regnum (gdbarch)->fp_control_status,

                       *fpregsetp + 32);
 
   /* FIXME: how can we supply FCRIR?  The ABI doesn't tell us.  */
   regcache_raw_supply (regcache,
                       *fpregsetp + 32);
 
   /* FIXME: how can we supply FCRIR?  The ABI doesn't tell us.  */
   regcache_raw_supply (regcache,

-                      mips_regnum (current_gdbarch)->fp_implementation_revision,
+                      mips_regnum (gdbarch)->fp_implementation_revision,

                       zerobuf);
 }
 
                       zerobuf);
 }
 


@@ -202,14 +218,16 @@ void
 mips_fill_fpregset (const struct regcache *regcache,
                    mips_elf_fpregset_t *fpregsetp, int regno)
 {
 mips_fill_fpregset (const struct regcache *regcache,
                    mips_elf_fpregset_t *fpregsetp, int regno)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

   char *from, *to;
 
   char *from, *to;
 

-  if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
+  if ((regno >= gdbarch_fp0_regnum (gdbarch))
+      && (regno < gdbarch_fp0_regnum (gdbarch) + 32))

     {
     {

-      to = (char *) (*fpregsetp + regno - FP0_REGNUM);
+      to = (char *) (*fpregsetp + regno - gdbarch_fp0_regnum (gdbarch));

       regcache_raw_collect (regcache, regno, to);
     }
       regcache_raw_collect (regcache, regno, to);
     }

-  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+  else if (regno == mips_regnum (gdbarch)->fp_control_status)

     {
       to = (char *) (*fpregsetp + 32);
       regcache_raw_collect (regcache, regno, to);
     {
       to = (char *) (*fpregsetp + 32);
       regcache_raw_collect (regcache, regno, to);


@@ -219,9 +237,10 @@ mips_fill_fpregset (const struct regcache *regcache,
       int regi;
 
       for (regi = 0; regi < 32; regi++)
       int regi;
 
       for (regi = 0; regi < 32; regi++)

-       mips_fill_fpregset (regcache, fpregsetp, FP0_REGNUM + regi);
+       mips_fill_fpregset (regcache, fpregsetp,
+                           gdbarch_fp0_regnum (gdbarch) + regi);

       mips_fill_fpregset (regcache, fpregsetp,
       mips_fill_fpregset (regcache, fpregsetp,

-                         mips_regnum (current_gdbarch)->fp_control_status);
+                         mips_regnum (gdbarch)->fp_control_status);

     }
 }
 
     }
 }
 


@@ -238,19 +257,24 @@ mips_fill_fpregset (const struct regcache *regcache,
 #define MIPS64_LINUX_JB_PC 0
 
 static int
 #define MIPS64_LINUX_JB_PC 0
 
 static int

-mips64_linux_get_longjmp_target (CORE_ADDR *pc)
+mips64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)

 {
   CORE_ADDR jb_addr;
 {
   CORE_ADDR jb_addr;

-  void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
-  int element_size = TARGET_PTR_BIT == 32 ? 4 : 8;
+  struct gdbarch *gdbarch = get_frame_arch (frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  void *buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
+  int element_size = gdbarch_ptr_bit (gdbarch) == 32 ? 4 : 8;

 
 

-  jb_addr = read_register (MIPS_A0_REGNUM);
+  jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM);

 
   if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,
 
   if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,

-                         buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
+                         buf,
+                         gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT))

     return 0;
 
     return 0;
 

-  *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+  *pc = extract_unsigned_integer (buf,
+                                 gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT,
+                                 byte_order);

 
   return 1;
 }
 
   return 1;
 }


@@ -261,12 +285,13 @@ mips64_linux_get_longjmp_target (CORE_ADDR *pc)
 
 /* Supply a 64-bit register.  */
 
 
 /* Supply a 64-bit register.  */
 

-void
+static void

 supply_64bit_reg (struct regcache *regcache, int regnum,
                  const gdb_byte *buf)
 {
 supply_64bit_reg (struct regcache *regcache, int regnum,
                  const gdb_byte *buf)
 {

-  if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG
-      && register_size (current_gdbarch, regnum) == 4)
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG
+      && register_size (gdbarch, regnum) == 4)

     regcache_raw_supply (regcache, regnum, buf + 4);
   else
     regcache_raw_supply (regcache, regnum, buf);
     regcache_raw_supply (regcache, regnum, buf + 4);
   else
     regcache_raw_supply (regcache, regnum, buf);


@@ -281,31 +306,37 @@ mips64_supply_gregset (struct regcache *regcache,
   int regi;
   const mips64_elf_greg_t *regp = *gregsetp;
   gdb_byte zerobuf[MAX_REGISTER_SIZE];
   int regi;
   const mips64_elf_greg_t *regp = *gregsetp;
   gdb_byte zerobuf[MAX_REGISTER_SIZE];

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 
 
   memset (zerobuf, 0, MAX_REGISTER_SIZE);
 

-  for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
+  for (regi = MIPS64_EF_REG0 + 1; regi <= MIPS64_EF_REG31; regi++)

     supply_64bit_reg (regcache, regi - MIPS64_EF_REG0,
                      (const gdb_byte *)(regp + regi));
 
     supply_64bit_reg (regcache, regi - MIPS64_EF_REG0,
                      (const gdb_byte *)(regp + regi));
 

-  supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->lo,
+  if (mips_linux_restart_reg_p (gdbarch))
+    supply_64bit_reg (regcache, MIPS_RESTART_REGNUM,
+                     (const gdb_byte *)(regp + MIPS64_EF_REG0));
+
+  supply_64bit_reg (regcache, mips_regnum (gdbarch)->lo,

                    (const gdb_byte *) (regp + MIPS64_EF_LO));
                    (const gdb_byte *) (regp + MIPS64_EF_LO));

-  supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->hi,
+  supply_64bit_reg (regcache, mips_regnum (gdbarch)->hi,

                    (const gdb_byte *) (regp + MIPS64_EF_HI));
 
                    (const gdb_byte *) (regp + MIPS64_EF_HI));
 

-  supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->pc,
+  supply_64bit_reg (regcache, mips_regnum (gdbarch)->pc,

                    (const gdb_byte *) (regp + MIPS64_EF_CP0_EPC));
                    (const gdb_byte *) (regp + MIPS64_EF_CP0_EPC));

-  supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->badvaddr,
+  supply_64bit_reg (regcache, mips_regnum (gdbarch)->badvaddr,

                    (const gdb_byte *) (regp + MIPS64_EF_CP0_BADVADDR));
   supply_64bit_reg (regcache, MIPS_PS_REGNUM,
                    (const gdb_byte *) (regp + MIPS64_EF_CP0_STATUS));
                    (const gdb_byte *) (regp + MIPS64_EF_CP0_BADVADDR));
   supply_64bit_reg (regcache, MIPS_PS_REGNUM,
                    (const gdb_byte *) (regp + MIPS64_EF_CP0_STATUS));

-  supply_64bit_reg (regcache, mips_regnum (current_gdbarch)->cause,
+  supply_64bit_reg (regcache, mips_regnum (gdbarch)->cause,

                    (const gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE));
 
   /* Fill inaccessible registers with zero.  */
                    (const gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE));
 
   /* Fill inaccessible registers with zero.  */

+  regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf);

   regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
   for (regi = MIPS_FIRST_EMBED_REGNUM;
   regcache_raw_supply (regcache, MIPS_UNUSED_REGNUM, zerobuf);
   for (regi = MIPS_FIRST_EMBED_REGNUM;

-       regi < MIPS_LAST_EMBED_REGNUM;
+       regi <= MIPS_LAST_EMBED_REGNUM;

        regi++)
     regcache_raw_supply (regcache, regi, zerobuf);
 }
        regi++)
     regcache_raw_supply (regcache, regi, zerobuf);
 }


@@ -316,43 +347,44 @@ void
 mips64_fill_gregset (const struct regcache *regcache,
                     mips64_elf_gregset_t *gregsetp, int regno)
 {
 mips64_fill_gregset (const struct regcache *regcache,
                     mips64_elf_gregset_t *gregsetp, int regno)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

   int regaddr, regi;
   mips64_elf_greg_t *regp = *gregsetp;
   int regaddr, regi;
   mips64_elf_greg_t *regp = *gregsetp;

-  void *src, *dst;
+  void *dst;

 
   if (regno == -1)
     {
       memset (regp, 0, sizeof (mips64_elf_gregset_t));
 
   if (regno == -1)
     {
       memset (regp, 0, sizeof (mips64_elf_gregset_t));

-      for (regi = 0; regi < 32; regi++)
+      for (regi = 1; regi < 32; regi++)

         mips64_fill_gregset (regcache, gregsetp, regi);
         mips64_fill_gregset (regcache, gregsetp, regi);

-      mips64_fill_gregset (regcache, gregsetp,
-                          mips_regnum (current_gdbarch)->lo);
-      mips64_fill_gregset (regcache, gregsetp,
-                          mips_regnum (current_gdbarch)->hi);
-      mips64_fill_gregset (regcache, gregsetp,
-                          mips_regnum (current_gdbarch)->pc);
-      mips64_fill_gregset (regcache, gregsetp,
-                          mips_regnum (current_gdbarch)->badvaddr);
+      mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo);
+      mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi);
+      mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc);
+      mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->badvaddr);

       mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);
       mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);

-      mips64_fill_gregset (regcache, gregsetp,
-                          mips_regnum (current_gdbarch)->cause);
+      mips64_fill_gregset (regcache, gregsetp,  mips_regnum (gdbarch)->cause);
+      mips64_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM);

       return;
    }
 
       return;
    }
 

-  if (regno < 32)
+  if (regno > 0 && regno < 32)

     regaddr = regno + MIPS64_EF_REG0;
     regaddr = regno + MIPS64_EF_REG0;

-  else if (regno == mips_regnum (current_gdbarch)->lo)
+  else if (regno == mips_regnum (gdbarch)->lo)

     regaddr = MIPS64_EF_LO;
     regaddr = MIPS64_EF_LO;

-  else if (regno == mips_regnum (current_gdbarch)->hi)
+  else if (regno == mips_regnum (gdbarch)->hi)

     regaddr = MIPS64_EF_HI;
     regaddr = MIPS64_EF_HI;

-  else if (regno == mips_regnum (current_gdbarch)->pc)
+  else if (regno == mips_regnum (gdbarch)->pc)

     regaddr = MIPS64_EF_CP0_EPC;
     regaddr = MIPS64_EF_CP0_EPC;

-  else if (regno == mips_regnum (current_gdbarch)->badvaddr)
+  else if (regno == mips_regnum (gdbarch)->badvaddr)

     regaddr = MIPS64_EF_CP0_BADVADDR;
   else if (regno == MIPS_PS_REGNUM)
     regaddr = MIPS64_EF_CP0_STATUS;
     regaddr = MIPS64_EF_CP0_BADVADDR;
   else if (regno == MIPS_PS_REGNUM)
     regaddr = MIPS64_EF_CP0_STATUS;

-  else if (regno == mips_regnum (current_gdbarch)->cause)
+  else if (regno == mips_regnum (gdbarch)->cause)

     regaddr = MIPS64_EF_CP0_CAUSE;
     regaddr = MIPS64_EF_CP0_CAUSE;

+  else if (mips_linux_restart_reg_p (gdbarch)
+          && regno == MIPS_RESTART_REGNUM)
+    regaddr = MIPS64_EF_REG0;

   else
     regaddr = -1;
 
   else
     regaddr = -1;
 


@@ -362,10 +394,10 @@ mips64_fill_gregset (const struct regcache *regcache,
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);

-      val = extract_signed_integer (buf,
-                                   register_size (current_gdbarch, regno));
+      val = extract_signed_integer (buf, register_size (gdbarch, regno),
+                                   byte_order);

       dst = regp + regaddr;
       dst = regp + regaddr;

-      store_signed_integer (dst, 8, val);
+      store_signed_integer (dst, 8, byte_order, val);

     }
 }
 
     }
 }
 


@@ -375,31 +407,35 @@ void
 mips64_supply_fpregset (struct regcache *regcache,
                        const mips64_elf_fpregset_t *fpregsetp)
 {
 mips64_supply_fpregset (struct regcache *regcache,
                        const mips64_elf_fpregset_t *fpregsetp)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);

   int regi;
 
   /* See mips_linux_o32_sigframe_init for a description of the
      peculiar FP register layout.  */
   int regi;
 
   /* See mips_linux_o32_sigframe_init for a description of the
      peculiar FP register layout.  */

-  if (register_size (current_gdbarch, FP0_REGNUM) == 4)
+  if (register_size (gdbarch, gdbarch_fp0_regnum (gdbarch)) == 4)

     for (regi = 0; regi < 32; regi++)
       {
        const gdb_byte *reg_ptr = (const gdb_byte *)(*fpregsetp + (regi & ~1));
     for (regi = 0; regi < 32; regi++)
       {
        const gdb_byte *reg_ptr = (const gdb_byte *)(*fpregsetp + (regi & ~1));

-       if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (regi & 1))
+       if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1))

          reg_ptr += 4;
          reg_ptr += 4;

-       regcache_raw_supply (regcache, FP0_REGNUM + regi, reg_ptr);
+       regcache_raw_supply (regcache,
+                            gdbarch_fp0_regnum (gdbarch) + regi,
+                            reg_ptr);

       }
   else
     for (regi = 0; regi < 32; regi++)
       }
   else
     for (regi = 0; regi < 32; regi++)

-      regcache_raw_supply (regcache, FP0_REGNUM + regi,
+      regcache_raw_supply (regcache,
+                          gdbarch_fp0_regnum (gdbarch) + regi,

                           (const char *)(*fpregsetp + regi));
 
                           (const char *)(*fpregsetp + regi));
 

-  supply_32bit_reg (regcache, mips_regnum (current_gdbarch)->fp_control_status,
+  supply_32bit_reg (regcache, mips_regnum (gdbarch)->fp_control_status,

                    (const gdb_byte *)(*fpregsetp + 32));
 
   /* The ABI doesn't tell us how to supply FCRIR, and core dumps don't
      include it - but the result of PTRACE_GETFPREGS does.  The best we
      can do is to assume that its value is present.  */
   supply_32bit_reg (regcache,
                    (const gdb_byte *)(*fpregsetp + 32));
 
   /* The ABI doesn't tell us how to supply FCRIR, and core dumps don't
      include it - but the result of PTRACE_GETFPREGS does.  The best we
      can do is to assume that its value is present.  */
   supply_32bit_reg (regcache,

-                   mips_regnum (current_gdbarch)->fp_implementation_revision,
+                   mips_regnum (gdbarch)->fp_implementation_revision,

                    (const gdb_byte *)(*fpregsetp + 32) + 4);
 }
 
                    (const gdb_byte *)(*fpregsetp + 32) + 4);
 }
 


@@ -410,60 +446,64 @@ void
 mips64_fill_fpregset (const struct regcache *regcache,
                      mips64_elf_fpregset_t *fpregsetp, int regno)
 {
 mips64_fill_fpregset (const struct regcache *regcache,
                      mips64_elf_fpregset_t *fpregsetp, int regno)
 {

+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

   gdb_byte *to;
 
   gdb_byte *to;
 

-  if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
+  if ((regno >= gdbarch_fp0_regnum (gdbarch))
+      && (regno < gdbarch_fp0_regnum (gdbarch) + 32))

     {
       /* See mips_linux_o32_sigframe_init for a description of the
         peculiar FP register layout.  */
     {
       /* See mips_linux_o32_sigframe_init for a description of the
         peculiar FP register layout.  */

-      if (register_size (current_gdbarch, regno) == 4)
+      if (register_size (gdbarch, regno) == 4)

        {
        {

-         int regi = regno - FP0_REGNUM;
+         int regi = regno - gdbarch_fp0_regnum (gdbarch);

 
          to = (gdb_byte *) (*fpregsetp + (regi & ~1));
 
          to = (gdb_byte *) (*fpregsetp + (regi & ~1));

-         if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (regi & 1))
+         if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1))

            to += 4;
          regcache_raw_collect (regcache, regno, to);
        }
       else
        {
            to += 4;
          regcache_raw_collect (regcache, regno, to);
        }
       else
        {

-         to = (gdb_byte *) (*fpregsetp + regno - FP0_REGNUM);
+         to = (gdb_byte *) (*fpregsetp + regno - gdbarch_fp0_regnum (gdbarch));

          regcache_raw_collect (regcache, regno, to);
        }
     }
          regcache_raw_collect (regcache, regno, to);
        }
     }

-  else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+  else if (regno == mips_regnum (gdbarch)->fp_control_status)

     {
       gdb_byte buf[MAX_REGISTER_SIZE];
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);
     {
       gdb_byte buf[MAX_REGISTER_SIZE];
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);

-      val = extract_signed_integer (buf,
-                                   register_size (current_gdbarch, regno));
+      val = extract_signed_integer (buf, register_size (gdbarch, regno),
+                                   byte_order);

       to = (gdb_byte *) (*fpregsetp + 32);
       to = (gdb_byte *) (*fpregsetp + 32);

-      store_signed_integer (to, 4, val);
+      store_signed_integer (to, 4, byte_order, val);

     }
     }

-  else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)

     {
       gdb_byte buf[MAX_REGISTER_SIZE];
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);
     {
       gdb_byte buf[MAX_REGISTER_SIZE];
       LONGEST val;
 
       regcache_raw_collect (regcache, regno, buf);

-      val = extract_signed_integer (buf,
-                                   register_size (current_gdbarch, regno));
+      val = extract_signed_integer (buf, register_size (gdbarch, regno),
+                                   byte_order);

       to = (gdb_byte *) (*fpregsetp + 32) + 4;
       to = (gdb_byte *) (*fpregsetp + 32) + 4;

-      store_signed_integer (to, 4, val);
+      store_signed_integer (to, 4, byte_order, val);

     }
   else if (regno == -1)
     {
       int regi;
 
       for (regi = 0; regi < 32; regi++)
     }
   else if (regno == -1)
     {
       int regi;
 
       for (regi = 0; regi < 32; regi++)

-       mips64_fill_fpregset (regcache, fpregsetp, FP0_REGNUM + regi);
+       mips64_fill_fpregset (regcache, fpregsetp,
+                             gdbarch_fp0_regnum (gdbarch) + regi);

       mips64_fill_fpregset (regcache, fpregsetp,
       mips64_fill_fpregset (regcache, fpregsetp,

-                           mips_regnum (current_gdbarch)->fp_control_status);
+                           mips_regnum (gdbarch)->fp_control_status);

       mips64_fill_fpregset (regcache, fpregsetp,
       mips64_fill_fpregset (regcache, fpregsetp,

-                           (mips_regnum (current_gdbarch)
-                            ->fp_implementation_revision));
+                           (mips_regnum (gdbarch)
+                             ->fp_implementation_revision));

     }
 }
 
     }
 }
 


@@ -472,7 +512,8 @@ mips64_fill_fpregset (const struct regcache *regcache,
     regsets, until multi-arch core support is ready.  */
 
 static void
     regsets, until multi-arch core support is ready.  */
 
 static void

-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+fetch_core_registers (struct regcache *regcache,
+                     char *core_reg_sect, unsigned core_reg_size,

                      int which, CORE_ADDR reg_addr)
 {
   mips_elf_gregset_t gregset;
                      int which, CORE_ADDR reg_addr)
 {
   mips_elf_gregset_t gregset;


@@ -485,13 +526,13 @@ fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
       if (core_reg_size == sizeof (gregset))
        {
          memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
       if (core_reg_size == sizeof (gregset))
        {
          memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));

-         mips_supply_gregset (current_regcache,
+         mips_supply_gregset (regcache,

                               (const mips_elf_gregset_t *) &gregset);
        }
       else if (core_reg_size == sizeof (gregset64))
        {
          memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64));
                               (const mips_elf_gregset_t *) &gregset);
        }
       else if (core_reg_size == sizeof (gregset64))
        {
          memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64));

-         mips64_supply_gregset (current_regcache,
+         mips64_supply_gregset (regcache,

                                 (const mips64_elf_gregset_t *) &gregset64);
        }
       else
                                 (const mips64_elf_gregset_t *) &gregset64);
        }
       else


@@ -504,14 +545,14 @@ fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
       if (core_reg_size == sizeof (fpregset))
        {
          memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
       if (core_reg_size == sizeof (fpregset))
        {
          memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));

-         mips_supply_fpregset (current_regcache,
+         mips_supply_fpregset (regcache,

                                (const mips_elf_fpregset_t *) &fpregset);
        }
       else if (core_reg_size == sizeof (fpregset64))
        {
          memcpy ((char *) &fpregset64, core_reg_sect,
                  sizeof (fpregset64));
                                (const mips_elf_fpregset_t *) &fpregset);
        }
       else if (core_reg_size == sizeof (fpregset64))
        {
          memcpy ((char *) &fpregset64, core_reg_sect,
                  sizeof (fpregset64));

-         mips64_supply_fpregset (current_regcache,
+         mips64_supply_fpregset (regcache,

                                  (const mips64_elf_fpregset_t *) &fpregset64);
        }
       else
                                  (const mips64_elf_fpregset_t *) &fpregset64);
        }
       else


@@ -533,6 +574,28 @@ static struct core_fns regset_core_fns =
   NULL                                 /* next */
 };
 
   NULL                                 /* next */
 };
 

+static const struct target_desc *
+mips_linux_core_read_description (struct gdbarch *gdbarch,
+                                 struct target_ops *target,
+                                 bfd *abfd)
+{
+  asection *section = bfd_get_section_by_name (abfd, ".reg");
+  if (! section)
+    return NULL;
+
+  switch (bfd_section_size (abfd, section))
+    {
+    case sizeof (mips_elf_gregset_t):
+      return mips_tdesc_gp32;
+
+    case sizeof (mips64_elf_gregset_t):
+      return mips_tdesc_gp64;
+
+    default:
+      return NULL;
+    }
+}
+

 
 /* Check the code at PC for a dynamic linker lazy resolution stub.
    Because they aren't in the .plt section, we pattern-match on the
 
 /* Check the code at PC for a dynamic linker lazy resolution stub.
    Because they aren't in the .plt section, we pattern-match on the


@@ -551,7 +614,8 @@ mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
 {
   unsigned char buf[28], *p;
   ULONGEST insn, insn1;
 {
   unsigned char buf[28], *p;
   ULONGEST insn, insn1;

-  int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64);
+  int n64 = (mips_abi (target_gdbarch) == MIPS_ABI_N64);
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);

 
   read_memory (pc - 12, buf, 28);
 
 
   read_memory (pc - 12, buf, 28);
 


@@ -569,7 +633,7 @@ mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
   p = buf + 12;
   while (p >= buf)
     {
   p = buf + 12;
   while (p >= buf)
     {

-      insn = extract_unsigned_integer (p, 4);
+      insn = extract_unsigned_integer (p, 4, byte_order);

       if (insn == insn1)
        break;
       p -= 4;
       if (insn == insn1)
        break;
       p -= 4;


@@ -577,7 +641,7 @@ mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
   if (p < buf)
     return 0;
 
   if (p < buf)
     return 0;
 

-  insn = extract_unsigned_integer (p + 4, 4);
+  insn = extract_unsigned_integer (p + 4, 4, byte_order);

   if (n64)
     {
       /* daddu t7,ra */
   if (n64)
     {
       /* daddu t7,ra */


@@ -591,12 +655,12 @@ mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
        return 0;
     }
 
        return 0;
     }
 

-  insn = extract_unsigned_integer (p + 8, 4);
+  insn = extract_unsigned_integer (p + 8, 4, byte_order);

   /* jalr t9,ra */
   if (insn != 0x0320f809)
     return 0;
 
   /* jalr t9,ra */
   if (insn != 0x0320f809)
     return 0;
 

-  insn = extract_unsigned_integer (p + 12, 4);
+  insn = extract_unsigned_integer (p + 12, 4, byte_order);

   if (n64)
     {
       /* daddiu t8,zero,0 */
   if (n64)
     {
       /* daddiu t8,zero,0 */


@@ -614,14 +678,14 @@ mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
 }
 
 /* Return non-zero iff PC belongs to the dynamic linker resolution
 }
 
 /* Return non-zero iff PC belongs to the dynamic linker resolution

-   code or to a stub.  */
+   code, a PLT entry, or a lazy binding stub.  */

 
 

-int
+static int

 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
 {
   /* Check whether PC is in the dynamic linker.  This also checks
 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
 {
   /* Check whether PC is in the dynamic linker.  This also checks

-     whether it is in the .plt section, which MIPS does not use.  */
-  if (in_solib_dynsym_resolve_code (pc))
+     whether it is in the .plt section, used by non-PIC executables.  */
+  if (svr4_in_dynsym_resolve_code (pc))

     return 1;
 
   /* Pattern match for the stub.  It would be nice if there were a
     return 1;
 
   /* Pattern match for the stub.  It would be nice if there were a


@@ -636,8 +700,8 @@ mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
    and glibc_skip_solib_resolver in glibc-tdep.c.  The normal glibc
    implementation of this triggers at "fixup" from the same objfile as
    "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
    and glibc_skip_solib_resolver in glibc-tdep.c.  The normal glibc
    implementation of this triggers at "fixup" from the same objfile as
    "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at

-   "__dl_runtime_resolve" directly.  An unresolved PLT entry will
-   point to _dl_runtime_resolve, which will first call
+   "__dl_runtime_resolve" directly.  An unresolved lazy binding
+   stub will point to _dl_runtime_resolve, which will first call

    __dl_runtime_resolve, and then pass control to the resolved
    function.  */
 
    __dl_runtime_resolve, and then pass control to the resolved
    function.  */
 


@@ -649,9 +713,9 @@ mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
   resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL);
 
   if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)
   resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL);
 
   if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)

-    return frame_pc_unwind (get_current_frame ());
+    return frame_unwind_caller_pc (get_current_frame ());

 
 

-  return 0;
+  return glibc_skip_solib_resolver (gdbarch, pc);

 }
 
 /* Signal trampoline support.  There are four supported layouts for a
 }
 
 /* Signal trampoline support.  There are four supported layouts for a


@@ -660,12 +724,12 @@ mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
    efficient way, but simplest.  First, declare all the unwinders.  */
 
 static void mips_linux_o32_sigframe_init (const struct tramp_frame *self,
    efficient way, but simplest.  First, declare all the unwinders.  */
 
 static void mips_linux_o32_sigframe_init (const struct tramp_frame *self,

-                                         struct frame_info *next_frame,
+                                         struct frame_info *this_frame,

                                          struct trad_frame_cache *this_cache,
                                          CORE_ADDR func);
 
 static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
                                          struct trad_frame_cache *this_cache,
                                          CORE_ADDR func);
 
 static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,

-                                            struct frame_info *next_frame,
+                                            struct frame_info *this_frame,

                                             struct trad_frame_cache *this_cache,
                                             CORE_ADDR func);
 
                                             struct trad_frame_cache *this_cache,
                                             CORE_ADDR func);
 


@@ -733,7 +797,7 @@ static const struct tramp_frame mips_linux_n64_rt_sigframe = {
 
    struct sigframe {
      u32 sf_ass[4];            [argument save space for o32]
 
    struct sigframe {
      u32 sf_ass[4];            [argument save space for o32]

-     u32 sf_code[2];           [signal trampoline]
+     u32 sf_code[2];           [signal trampoline or fill]

      struct sigcontext sf_sc;
      sigset_t sf_mask;
    };
      struct sigcontext sf_sc;
      sigset_t sf_mask;
    };


@@ -763,7 +827,7 @@ static const struct tramp_frame mips_linux_n64_rt_sigframe = {
 
    struct rt_sigframe {
      u32 rs_ass[4];            [argument save space for o32]
 
    struct rt_sigframe {
      u32 rs_ass[4];            [argument save space for o32]

-     u32 rs_code[2]            [signal trampoline]
+     u32 rs_code[2]            [signal trampoline or fill]

      struct siginfo rs_info;
      struct ucontext rs_uc;
    };
      struct siginfo rs_info;
      struct ucontext rs_uc;
    };


@@ -778,7 +842,6 @@ static const struct tramp_frame mips_linux_n64_rt_sigframe = {
    };  */
 /* *INDENT-ON* */
 
    };  */
 /* *INDENT-ON* */
 

-#define SIGFRAME_CODE_OFFSET         (4 * 4)

 #define SIGFRAME_SIGCONTEXT_OFFSET   (6 * 4)
 
 #define RTSIGFRAME_SIGINFO_SIZE      128
 #define SIGFRAME_SIGCONTEXT_OFFSET   (6 * 4)
 
 #define RTSIGFRAME_SIGINFO_SIZE      128


@@ -801,38 +864,42 @@ static const struct tramp_frame mips_linux_n64_rt_sigframe = {
 
 static void
 mips_linux_o32_sigframe_init (const struct tramp_frame *self,
 
 static void
 mips_linux_o32_sigframe_init (const struct tramp_frame *self,

-                             struct frame_info *next_frame,
+                             struct frame_info *this_frame,

                              struct trad_frame_cache *this_cache,
                              CORE_ADDR func)
 {
                              struct trad_frame_cache *this_cache,
                              CORE_ADDR func)
 {

+  struct gdbarch *gdbarch = get_frame_arch (this_frame);

   int ireg, reg_position;
   int ireg, reg_position;

-  CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
-  const struct mips_regnum *regs = mips_regnum (current_gdbarch);
+  CORE_ADDR frame_sp = get_frame_sp (this_frame);
+  CORE_ADDR sigcontext_base;
+  const struct mips_regnum *regs = mips_regnum (gdbarch);

   CORE_ADDR regs_base;
 
   if (self == &mips_linux_o32_sigframe)
   CORE_ADDR regs_base;
 
   if (self == &mips_linux_o32_sigframe)

-    sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET;
+    sigcontext_base = frame_sp + SIGFRAME_SIGCONTEXT_OFFSET;

   else
   else

-    sigcontext_base += RTSIGFRAME_SIGCONTEXT_OFFSET;
+    sigcontext_base = frame_sp + RTSIGFRAME_SIGCONTEXT_OFFSET;

 
   /* I'm not proud of this hack.  Eventually we will have the
      infrastructure to indicate the size of saved registers on a
      per-frame basis, but right now we don't; the kernel saves eight
      bytes but we only want four.  Use regs_base to access any
      64-bit fields.  */
 
   /* I'm not proud of this hack.  Eventually we will have the
      infrastructure to indicate the size of saved registers on a
      per-frame basis, but right now we don't; the kernel saves eight
      bytes but we only want four.  Use regs_base to access any
      64-bit fields.  */

-  if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+  if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)

     regs_base = sigcontext_base + 4;
   else
     regs_base = sigcontext_base;
 
     regs_base = sigcontext_base + 4;
   else
     regs_base = sigcontext_base;
 

-#if 0
-  trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
-                          regs_base + SIGCONTEXT_REGS);
-#endif
+  if (mips_linux_restart_reg_p (gdbarch))
+    trad_frame_set_reg_addr (this_cache,
+                            (MIPS_RESTART_REGNUM
+                             + gdbarch_num_regs (gdbarch)),
+                            regs_base + SIGCONTEXT_REGS);

 
   for (ireg = 1; ireg < 32; ireg++)
     trad_frame_set_reg_addr (this_cache,
 
   for (ireg = 1; ireg < 32; ireg++)
     trad_frame_set_reg_addr (this_cache,

-                            ireg + MIPS_ZERO_REGNUM + NUM_REGS,
+                            ireg + MIPS_ZERO_REGNUM
+                              + gdbarch_num_regs (gdbarch),

                             regs_base + SIGCONTEXT_REGS
                             + ireg * SIGCONTEXT_REG_SIZE);
 
                             regs_base + SIGCONTEXT_REGS
                             + ireg * SIGCONTEXT_REG_SIZE);
 


@@ -845,34 +912,42 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
      layout, since we can't tell, and it's much more common.  Which bits are
      the "high" bits depends on endianness.  */
   for (ireg = 0; ireg < 32; ireg++)
      layout, since we can't tell, and it's much more common.  Which bits are
      the "high" bits depends on endianness.  */
   for (ireg = 0; ireg < 32; ireg++)

-    if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (ireg & 1))
-      trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
+    if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (ireg & 1))
+      trad_frame_set_reg_addr (this_cache,
+                              ireg + regs->fp0 +
+                                gdbarch_num_regs (gdbarch),

                               sigcontext_base + SIGCONTEXT_FPREGS + 4
                               + (ireg & ~1) * SIGCONTEXT_REG_SIZE);
     else
                               sigcontext_base + SIGCONTEXT_FPREGS + 4
                               + (ireg & ~1) * SIGCONTEXT_REG_SIZE);
     else

-      trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
+      trad_frame_set_reg_addr (this_cache,
+                              ireg + regs->fp0
+                                + gdbarch_num_regs (gdbarch),

                               sigcontext_base + SIGCONTEXT_FPREGS
                               + (ireg & ~1) * SIGCONTEXT_REG_SIZE);
 
                               sigcontext_base + SIGCONTEXT_FPREGS
                               + (ireg & ~1) * SIGCONTEXT_REG_SIZE);
 

-  trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->pc + gdbarch_num_regs (gdbarch),

                           regs_base + SIGCONTEXT_PC);
 
   trad_frame_set_reg_addr (this_cache,
                           regs_base + SIGCONTEXT_PC);
 
   trad_frame_set_reg_addr (this_cache,

-                          regs->fp_control_status + NUM_REGS,
+                          regs->fp_control_status
+                          + gdbarch_num_regs (gdbarch),

                           sigcontext_base + SIGCONTEXT_FPCSR);
                           sigcontext_base + SIGCONTEXT_FPCSR);

-  trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->hi + gdbarch_num_regs (gdbarch),

                           regs_base + SIGCONTEXT_HI);
                           regs_base + SIGCONTEXT_HI);

-  trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->lo + gdbarch_num_regs (gdbarch),

                           regs_base + SIGCONTEXT_LO);
                           regs_base + SIGCONTEXT_LO);

-  trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->cause + gdbarch_num_regs (gdbarch),

                           sigcontext_base + SIGCONTEXT_CAUSE);
                           sigcontext_base + SIGCONTEXT_CAUSE);

-  trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->badvaddr + gdbarch_num_regs (gdbarch),

                           sigcontext_base + SIGCONTEXT_BADVADDR);
 
   /* Choice of the bottom of the sigframe is somewhat arbitrary.  */
                           sigcontext_base + SIGCONTEXT_BADVADDR);
 
   /* Choice of the bottom of the sigframe is somewhat arbitrary.  */

-  trad_frame_set_id (this_cache,
-                    frame_id_build (func - SIGFRAME_CODE_OFFSET,
-                                    func));
+  trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));

 }
 
 /* *INDENT-OFF* */
 }
 
 /* *INDENT-OFF* */


@@ -880,7 +955,7 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
 
   struct rt_sigframe_n32 {
     u32 rs_ass[4];                  [ argument save space for o32 ]
 
   struct rt_sigframe_n32 {
     u32 rs_ass[4];                  [ argument save space for o32 ]

-    u32 rs_code[2];                 [ signal trampoline ]
+    u32 rs_code[2];                 [ signal trampoline or fill ]

     struct siginfo rs_info;
     struct ucontextn32 rs_uc;
   };
     struct siginfo rs_info;
     struct ucontextn32 rs_uc;
   };


@@ -893,7 +968,7 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
     sigset_t            uc_sigmask;   [ mask last for extensibility ]
   };
 
     sigset_t            uc_sigmask;   [ mask last for extensibility ]
   };
 

-  struct rt_sigframe_n32 {
+  struct rt_sigframe {

     u32 rs_ass[4];                  [ argument save space for o32 ]
     u32 rs_code[2];                 [ signal trampoline ]
     struct siginfo rs_info;
     u32 rs_ass[4];                  [ argument save space for o32 ]
     u32 rs_code[2];                 [ signal trampoline ]
     struct siginfo rs_info;


@@ -914,15 +989,23 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
     unsigned long long sc_regs[32];
     unsigned long long sc_fpregs[32];
     unsigned long long sc_mdhi;
     unsigned long long sc_regs[32];
     unsigned long long sc_fpregs[32];
     unsigned long long sc_mdhi;

+    unsigned long long sc_hi1;
+    unsigned long long sc_hi2;
+    unsigned long long sc_hi3;

     unsigned long long sc_mdlo;
     unsigned long long sc_mdlo;

+    unsigned long long sc_lo1;
+    unsigned long long sc_lo2;
+    unsigned long long sc_lo3;

     unsigned long long sc_pc;
     unsigned long long sc_pc;

-    unsigned int       sc_status;

     unsigned int       sc_fpc_csr;
     unsigned int       sc_fpc_csr;

-    unsigned int       sc_fpc_eir;

     unsigned int       sc_used_math;
     unsigned int       sc_used_math;

-    unsigned int       sc_cause;
-    unsigned int       sc_badvaddr;
-  };  */
+    unsigned int       sc_dsp;
+    unsigned int       sc_reserved;
+  };
+
+  That is the post-2.6.12 definition of the 64-bit sigcontext; before
+  then, there were no hi1-hi3 or lo1-lo3.  Cause and badvaddr were
+  included too.  */

 /* *INDENT-ON* */
 
 #define N32_STACK_T_SIZE               STACK_T_SIZE
 /* *INDENT-ON* */
 
 #define N32_STACK_T_SIZE               STACK_T_SIZE


@@ -939,67 +1022,113 @@ mips_linux_o32_sigframe_init (const struct tramp_frame *self,
 #define N64_SIGCONTEXT_REGS     (0 * 8)
 #define N64_SIGCONTEXT_FPREGS   (32 * 8)
 #define N64_SIGCONTEXT_HI       (64 * 8)
 #define N64_SIGCONTEXT_REGS     (0 * 8)
 #define N64_SIGCONTEXT_FPREGS   (32 * 8)
 #define N64_SIGCONTEXT_HI       (64 * 8)

-#define N64_SIGCONTEXT_LO       (65 * 8)
-#define N64_SIGCONTEXT_PC       (66 * 8)
-#define N64_SIGCONTEXT_FPCSR    (67 * 8 + 1 * 4)
-#define N64_SIGCONTEXT_FIR      (67 * 8 + 2 * 4)
-#define N64_SIGCONTEXT_CAUSE    (67 * 8 + 4 * 4)
-#define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4)
+#define N64_SIGCONTEXT_LO       (68 * 8)
+#define N64_SIGCONTEXT_PC       (72 * 8)
+#define N64_SIGCONTEXT_FPCSR    (73 * 8)

 
 #define N64_SIGCONTEXT_REG_SIZE 8
 
 static void
 mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
 
 #define N64_SIGCONTEXT_REG_SIZE 8
 
 static void
 mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,

-                                struct frame_info *next_frame,
+                                struct frame_info *this_frame,

                                 struct trad_frame_cache *this_cache,
                                 CORE_ADDR func)
 {
                                 struct trad_frame_cache *this_cache,
                                 CORE_ADDR func)
 {

+  struct gdbarch *gdbarch = get_frame_arch (this_frame);

   int ireg, reg_position;
   int ireg, reg_position;

-  CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
-  const struct mips_regnum *regs = mips_regnum (current_gdbarch);
+  CORE_ADDR frame_sp = get_frame_sp (this_frame);
+  CORE_ADDR sigcontext_base;
+  const struct mips_regnum *regs = mips_regnum (gdbarch);

 
   if (self == &mips_linux_n32_rt_sigframe)
 
   if (self == &mips_linux_n32_rt_sigframe)

-    sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET;
+    sigcontext_base = frame_sp + N32_SIGFRAME_SIGCONTEXT_OFFSET;

   else
   else

-    sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET;
+    sigcontext_base = frame_sp + N64_SIGFRAME_SIGCONTEXT_OFFSET;

 
 

-#if 0
-  trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
-                          sigcontext_base + N64_SIGCONTEXT_REGS);
-#endif
+  if (mips_linux_restart_reg_p (gdbarch))
+    trad_frame_set_reg_addr (this_cache,
+                            (MIPS_RESTART_REGNUM
+                             + gdbarch_num_regs (gdbarch)),
+                            sigcontext_base + N64_SIGCONTEXT_REGS);

 
   for (ireg = 1; ireg < 32; ireg++)
     trad_frame_set_reg_addr (this_cache,
 
   for (ireg = 1; ireg < 32; ireg++)
     trad_frame_set_reg_addr (this_cache,

-                            ireg + MIPS_ZERO_REGNUM + NUM_REGS,
+                            ireg + MIPS_ZERO_REGNUM
+                            + gdbarch_num_regs (gdbarch),

                             sigcontext_base + N64_SIGCONTEXT_REGS
                             + ireg * N64_SIGCONTEXT_REG_SIZE);
 
   for (ireg = 0; ireg < 32; ireg++)
                             sigcontext_base + N64_SIGCONTEXT_REGS
                             + ireg * N64_SIGCONTEXT_REG_SIZE);
 
   for (ireg = 0; ireg < 32; ireg++)

-    trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
+    trad_frame_set_reg_addr (this_cache,
+                            ireg + regs->fp0
+                            + gdbarch_num_regs (gdbarch),

                             sigcontext_base + N64_SIGCONTEXT_FPREGS
                             + ireg * N64_SIGCONTEXT_REG_SIZE);
 
                             sigcontext_base + N64_SIGCONTEXT_FPREGS
                             + ireg * N64_SIGCONTEXT_REG_SIZE);
 

-  trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->pc + gdbarch_num_regs (gdbarch),

                           sigcontext_base + N64_SIGCONTEXT_PC);
 
   trad_frame_set_reg_addr (this_cache,
                           sigcontext_base + N64_SIGCONTEXT_PC);
 
   trad_frame_set_reg_addr (this_cache,

-                          regs->fp_control_status + NUM_REGS,
+                          regs->fp_control_status
+                          + gdbarch_num_regs (gdbarch),

                           sigcontext_base + N64_SIGCONTEXT_FPCSR);
                           sigcontext_base + N64_SIGCONTEXT_FPCSR);

-  trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->hi + gdbarch_num_regs (gdbarch),

                           sigcontext_base + N64_SIGCONTEXT_HI);
                           sigcontext_base + N64_SIGCONTEXT_HI);

-  trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
+  trad_frame_set_reg_addr (this_cache,
+                          regs->lo + gdbarch_num_regs (gdbarch),

                           sigcontext_base + N64_SIGCONTEXT_LO);
                           sigcontext_base + N64_SIGCONTEXT_LO);

-  trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
-                          sigcontext_base + N64_SIGCONTEXT_CAUSE);
-  trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
-                          sigcontext_base + N64_SIGCONTEXT_BADVADDR);

 
   /* Choice of the bottom of the sigframe is somewhat arbitrary.  */
 
   /* Choice of the bottom of the sigframe is somewhat arbitrary.  */

-  trad_frame_set_id (this_cache,
-                    frame_id_build (func - SIGFRAME_CODE_OFFSET,
-                                    func));
+  trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
+}
+
+static void
+mips_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc);
+
+  /* Clear the syscall restart flag.  */
+  if (mips_linux_restart_reg_p (gdbarch))
+    regcache_cooked_write_unsigned (regcache, MIPS_RESTART_REGNUM, 0);
+}
+
+/* Return 1 if MIPS_RESTART_REGNUM is usable.  */
+
+int
+mips_linux_restart_reg_p (struct gdbarch *gdbarch)
+{
+  /* If we do not have a target description with registers, then
+     MIPS_RESTART_REGNUM will not be included in the register set.  */
+  if (!tdesc_has_registers (gdbarch_target_desc (gdbarch)))
+    return 0;
+
+  /* If we do, then MIPS_RESTART_REGNUM is safe to check; it will
+     either be GPR-sized or missing.  */
+  return register_size (gdbarch, MIPS_RESTART_REGNUM) > 0;

 }
 
 }
 

+/* When FRAME is at a syscall instruction, return the PC of the next
+   instruction to be executed.  */
+
+static CORE_ADDR
+mips_linux_syscall_next_pc (struct frame_info *frame)
+{
+  CORE_ADDR pc = get_frame_pc (frame);
+  ULONGEST v0 = get_frame_register_unsigned (frame, MIPS_V0_REGNUM);
+
+  /* If we are about to make a sigreturn syscall, use the unwinder to
+     decode the signal frame.  */
+  if (v0 == MIPS_NR_sigreturn
+      || v0 == MIPS_NR_rt_sigreturn
+      || v0 == MIPS_NR_N64_rt_sigreturn
+      || v0 == MIPS_NR_N32_rt_sigreturn)
+    return frame_unwind_caller_pc (get_current_frame ());
+
+  return pc + 4;
+}

 
 /* Initialize one of the GNU/Linux OS ABIs.  */
 
 
 /* Initialize one of the GNU/Linux OS ABIs.  */
 


@@ -1009,6 +1138,7 @@ mips_linux_init_abi (struct gdbarch_info info,
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   enum mips_abi abi = mips_abi (gdbarch);
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   enum mips_abi abi = mips_abi (gdbarch);

+  struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;

 
   switch (abi)
     {
 
   switch (abi)
     {


@@ -1047,11 +1177,9 @@ mips_linux_init_abi (struct gdbarch_info info,
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe);
        break;
       default:
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe);
        break;
       default:

-       internal_error (__FILE__, __LINE__, _("can't handle ABI"));

        break;
     }
 
        break;
     }
 

-  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);

   set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
 
   set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
   set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
 
   set_gdbarch_software_single_step (gdbarch, mips_software_single_step);


@@ -1059,8 +1187,46 @@ mips_linux_init_abi (struct gdbarch_info info,
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);

+
+  /* Initialize this lazily, to avoid an initialization order
+     dependency on solib-svr4.c's _initialize routine.  */
+  if (mips_svr4_so_ops.in_dynsym_resolve_code == NULL)
+    {
+      mips_svr4_so_ops = svr4_so_ops;
+      mips_svr4_so_ops.in_dynsym_resolve_code
+       = mips_linux_in_dynsym_resolve_code;
+    }
+  set_solib_ops (gdbarch, &mips_svr4_so_ops);
+
+  set_gdbarch_write_pc (gdbarch, mips_linux_write_pc);
+
+  set_gdbarch_core_read_description (gdbarch,
+                                    mips_linux_core_read_description);
+
+  tdep->syscall_next_pc = mips_linux_syscall_next_pc;
+
+  if (tdesc_data)
+    {
+      const struct tdesc_feature *feature;
+
+      /* If we have target-described registers, then we can safely
+        reserve a number for MIPS_RESTART_REGNUM (whether it is
+        described or not).  */
+      gdb_assert (gdbarch_num_regs (gdbarch) <= MIPS_RESTART_REGNUM);
+      set_gdbarch_num_regs (gdbarch, MIPS_RESTART_REGNUM + 1);
+
+      /* If it's present, then assign it to the reserved number.  */
+      feature = tdesc_find_feature (info.target_desc,
+                                   "org.gnu.gdb.mips.linux");
+      if (feature != NULL)
+       tdesc_numbered_register (feature, tdesc_data, MIPS_RESTART_REGNUM,
+                                "restart");
+    }

 }
 
 }
 

+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_mips_linux_tdep;
+

 void
 _initialize_mips_linux_tdep (void)
 {
 void
 _initialize_mips_linux_tdep (void)
 {