/tmp/gdb-8.1/gdb/mn10300-linux-tdep.c

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/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.

   Copyright (C) 2003-2018 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 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 "gdbcore.h"
#include "regcache.h"
#include "mn10300-tdep.h"
#include "bfd.h"
#include "elf-bfd.h"
#include "osabi.h"
#include "regset.h"
#include "solib-svr4.h"
#include "frame.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "linux-tdep.h"

/* Transliterated from <asm-mn10300/elf.h>...  */
#define MN10300_ELF_NGREG 28
#define MN10300_ELF_NFPREG 32

typedef gdb_byte   mn10300_elf_greg_t[4];
typedef mn10300_elf_greg_t mn10300_elf_gregset_t[MN10300_ELF_NGREG];

typedef gdb_byte   mn10300_elf_fpreg_t[4];
typedef struct
{
  mn10300_elf_fpreg_t fpregs[MN10300_ELF_NFPREG];
  gdb_byte    fpcr[4];
} mn10300_elf_fpregset_t;

/* elf_gregset_t register indices stolen from include/asm-mn10300/ptrace.h.  */
#define MN10300_ELF_GREGSET_T_REG_INDEX_A3  0
#define MN10300_ELF_GREGSET_T_REG_INDEX_A2  1
#define MN10300_ELF_GREGSET_T_REG_INDEX_D3  2
#define MN10300_ELF_GREGSET_T_REG_INDEX_D2  3
#define MN10300_ELF_GREGSET_T_REG_INDEX_MCVF    4
#define MN10300_ELF_GREGSET_T_REG_INDEX_MCRL    5
#define MN10300_ELF_GREGSET_T_REG_INDEX_MCRH    6
#define MN10300_ELF_GREGSET_T_REG_INDEX_MDRQ    7
#define MN10300_ELF_GREGSET_T_REG_INDEX_E1  8
#define MN10300_ELF_GREGSET_T_REG_INDEX_E0  9
#define MN10300_ELF_GREGSET_T_REG_INDEX_E7  10
#define MN10300_ELF_GREGSET_T_REG_INDEX_E6  11
#define MN10300_ELF_GREGSET_T_REG_INDEX_E5  12
#define MN10300_ELF_GREGSET_T_REG_INDEX_E4  13
#define MN10300_ELF_GREGSET_T_REG_INDEX_E3  14
#define MN10300_ELF_GREGSET_T_REG_INDEX_E2  15
#define MN10300_ELF_GREGSET_T_REG_INDEX_SP  16
#define MN10300_ELF_GREGSET_T_REG_INDEX_LAR 17
#define MN10300_ELF_GREGSET_T_REG_INDEX_LIR 18
#define MN10300_ELF_GREGSET_T_REG_INDEX_MDR 19
#define MN10300_ELF_GREGSET_T_REG_INDEX_A1  20
#define MN10300_ELF_GREGSET_T_REG_INDEX_A0  21
#define MN10300_ELF_GREGSET_T_REG_INDEX_D1  22
#define MN10300_ELF_GREGSET_T_REG_INDEX_D0  23
#define MN10300_ELF_GREGSET_T_REG_INDEX_ORIG_D0 24
#define MN10300_ELF_GREGSET_T_REG_INDEX_EPSW    25
#define MN10300_ELF_GREGSET_T_REG_INDEX_PC  26

/* New gdbarch API for corefile registers.
   Given a section name and size, create a struct reg object
   with a supply_register and a collect_register method.  */

/* Copy register value of REGNUM from regset to regcache.
   If REGNUM is -1, do this for all gp registers in regset.  */

static void
am33_supply_gregset_method (const struct regset *regset, 
                struct regcache *regcache, 
                int regnum, const void *gregs, size_t len)
{
  const mn10300_elf_greg_t *regp = (const mn10300_elf_greg_t *) gregs;
  int i;

  gdb_assert (len >= sizeof (mn10300_elf_gregset_t));

  switch (regnum) {
  case E_D0_REGNUM:
    regcache_raw_supply (regcache, E_D0_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D0));
    break;
  case E_D1_REGNUM:
    regcache_raw_supply (regcache, E_D1_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D1));
    break;
  case E_D2_REGNUM:
    regcache_raw_supply (regcache, E_D2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D2));
    break;
  case E_D3_REGNUM:
    regcache_raw_supply (regcache, E_D3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D3));
    break;
  case E_A0_REGNUM:
    regcache_raw_supply (regcache, E_A0_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A0));
    break;
  case E_A1_REGNUM:
    regcache_raw_supply (regcache, E_A1_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A1));
    break;
  case E_A2_REGNUM:
    regcache_raw_supply (regcache, E_A2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A2));
    break;
  case E_A3_REGNUM:
    regcache_raw_supply (regcache, E_A3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A3));
    break;
  case E_SP_REGNUM:
    regcache_raw_supply (regcache, E_SP_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_SP));
    break;
  case E_PC_REGNUM:
    regcache_raw_supply (regcache, E_PC_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_PC));
    break;
  case E_MDR_REGNUM:
    regcache_raw_supply (regcache, E_MDR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MDR));
    break;
  case E_PSW_REGNUM:
    regcache_raw_supply (regcache, E_PSW_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_EPSW));
    break;
  case E_LIR_REGNUM:
    regcache_raw_supply (regcache, E_LIR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_LIR));
    break;
  case E_LAR_REGNUM:
    regcache_raw_supply (regcache, E_LAR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_LAR));
    break;
  case E_MDRQ_REGNUM:
    regcache_raw_supply (regcache, E_MDRQ_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MDRQ));
    break;
  case E_E0_REGNUM:
    regcache_raw_supply (regcache, E_E0_REGNUM,   
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E0));
    break;
  case E_E1_REGNUM:
    regcache_raw_supply (regcache, E_E1_REGNUM,
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E1));
    break;
  case E_E2_REGNUM:
    regcache_raw_supply (regcache, E_E2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E2));
    break;
  case E_E3_REGNUM:
    regcache_raw_supply (regcache, E_E3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E3));
    break;
  case E_E4_REGNUM:
    regcache_raw_supply (regcache, E_E4_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E4));
    break;
  case E_E5_REGNUM:
    regcache_raw_supply (regcache, E_E5_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E5));
    break;
  case E_E6_REGNUM:
    regcache_raw_supply (regcache, E_E6_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E6));
    break;
  case E_E7_REGNUM:
    regcache_raw_supply (regcache, E_E7_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E7));
    break;

    /* ssp, msp, and usp are inaccessible.  */
  case E_E8_REGNUM:
    regcache->raw_supply_zeroed (E_E8_REGNUM);
    break;
  case E_E9_REGNUM:
    regcache->raw_supply_zeroed (E_E9_REGNUM);
    break;
  case E_E10_REGNUM:
    regcache->raw_supply_zeroed (E_E10_REGNUM);
    break;
  case E_MCRH_REGNUM:
    regcache_raw_supply (regcache, E_MCRH_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCRH));
    break;
  case E_MCRL_REGNUM:
    regcache_raw_supply (regcache, E_MCRL_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCRL));
    break;
  case E_MCVF_REGNUM:
    regcache_raw_supply (regcache, E_MCVF_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCVF));
    break;
  case E_FPCR_REGNUM:
    /* FPCR is numbered among the GP regs, but handled as an FP reg.
       Do nothing.  */
    break;
  case E_FPCR_REGNUM + 1:
    /* The two unused registers beyond fpcr are inaccessible.  */
    regcache->raw_supply_zeroed (E_FPCR_REGNUM + 1);
    break;
  case E_FPCR_REGNUM + 2:
    regcache->raw_supply_zeroed (E_FPCR_REGNUM + 2);
    break;
  default:  /* An error, obviously, but should we error out?  */
    break;
  case -1:
    for (i = 0; i < MN10300_ELF_NGREG; i++)
      am33_supply_gregset_method (regset, regcache, i, gregs, len);
    break;
  }
  return;
}

/* Copy fp register value of REGNUM from regset to regcache.
   If REGNUM is -1, do this for all fp registers in regset.  */

static void
am33_supply_fpregset_method (const struct regset *regset, 
                 struct regcache *regcache, 
                 int regnum, const void *fpregs, size_t len)
{
  const mn10300_elf_fpregset_t *fpregset
    = (const mn10300_elf_fpregset_t *) fpregs;

  gdb_assert (len >= sizeof (mn10300_elf_fpregset_t));

  if (regnum == -1)
    {
      int i;

      for (i = 0; i < MN10300_ELF_NFPREG; i++)
    am33_supply_fpregset_method (regset, regcache,
                                 E_FS0_REGNUM + i, fpregs, len);
      am33_supply_fpregset_method (regset, regcache, 
                   E_FPCR_REGNUM, fpregs, len);
    }
  else if (regnum == E_FPCR_REGNUM)
    regcache_raw_supply (regcache, E_FPCR_REGNUM, 
             &fpregset->fpcr);
  else if (E_FS0_REGNUM <= regnum
       && regnum < E_FS0_REGNUM + MN10300_ELF_NFPREG)
    regcache_raw_supply (regcache, regnum, 
             &fpregset->fpregs[regnum - E_FS0_REGNUM]);

  return;
}

/* Copy register values from regcache to regset.  */

static void
am33_collect_gregset_method (const struct regset *regset, 
                 const struct regcache *regcache, 
                 int regnum, void *gregs, size_t len)
{
  mn10300_elf_gregset_t *regp = (gdb_byte (*)[28][4]) gregs;
  int i;

  gdb_assert (len >= sizeof (mn10300_elf_gregset_t));

  switch (regnum) {
  case E_D0_REGNUM:
    regcache_raw_collect (regcache, E_D0_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D0));
    break;
  case E_D1_REGNUM:
    regcache_raw_collect (regcache, E_D1_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D1));
    break;
  case E_D2_REGNUM:
    regcache_raw_collect (regcache, E_D2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D2));
    break;
  case E_D3_REGNUM:
    regcache_raw_collect (regcache, E_D3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_D3));
    break;
  case E_A0_REGNUM:
    regcache_raw_collect (regcache, E_A0_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A0));
    break;
  case E_A1_REGNUM:
    regcache_raw_collect (regcache, E_A1_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A1));
    break;
  case E_A2_REGNUM:
    regcache_raw_collect (regcache, E_A2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A2));
    break;
  case E_A3_REGNUM:
    regcache_raw_collect (regcache, E_A3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_A3));
    break;
  case E_SP_REGNUM:
    regcache_raw_collect (regcache, E_SP_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_SP));
    break;
  case E_PC_REGNUM:
    regcache_raw_collect (regcache, E_PC_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_PC));
    break;
  case E_MDR_REGNUM:
    regcache_raw_collect (regcache, E_MDR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MDR));
    break;
  case E_PSW_REGNUM:
    regcache_raw_collect (regcache, E_PSW_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_EPSW));
    break;
  case E_LIR_REGNUM:
    regcache_raw_collect (regcache, E_LIR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_LIR));
    break;
  case E_LAR_REGNUM:
    regcache_raw_collect (regcache, E_LAR_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_LAR));
    break;
  case E_MDRQ_REGNUM:
    regcache_raw_collect (regcache, E_MDRQ_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MDRQ));
    break;
  case E_E0_REGNUM:
    regcache_raw_collect (regcache, E_E0_REGNUM,   
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E0));
    break;
  case E_E1_REGNUM:
    regcache_raw_collect (regcache, E_E1_REGNUM,
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E1));
    break;
  case E_E2_REGNUM:
    regcache_raw_collect (regcache, E_E2_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E2));
    break;
  case E_E3_REGNUM:
    regcache_raw_collect (regcache, E_E3_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E3));
    break;
  case E_E4_REGNUM:
    regcache_raw_collect (regcache, E_E4_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E4));
    break;
  case E_E5_REGNUM:
    regcache_raw_collect (regcache, E_E5_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E5));
    break;
  case E_E6_REGNUM:
    regcache_raw_collect (regcache, E_E6_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E6));
    break;
  case E_E7_REGNUM:
    regcache_raw_collect (regcache, E_E7_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_E7));
    break;

    /* ssp, msp, and usp are inaccessible.  */
  case E_E8_REGNUM:
    /* The gregset struct has noplace to put this: do nothing.  */
    break;
  case E_E9_REGNUM:
    /* The gregset struct has noplace to put this: do nothing.  */
    break;
  case E_E10_REGNUM:
    /* The gregset struct has noplace to put this: do nothing.  */
    break;
  case E_MCRH_REGNUM:
    regcache_raw_collect (regcache, E_MCRH_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCRH));
    break;
  case E_MCRL_REGNUM:
    regcache_raw_collect (regcache, E_MCRL_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCRL));
    break;
  case E_MCVF_REGNUM:
    regcache_raw_collect (regcache, E_MCVF_REGNUM, 
             (regp + MN10300_ELF_GREGSET_T_REG_INDEX_MCVF));
    break;
  case E_FPCR_REGNUM:
    /* FPCR is numbered among the GP regs, but handled as an FP reg.
       Do nothing.  */
    break;
  case E_FPCR_REGNUM + 1:
    /* The gregset struct has noplace to put this: do nothing.  */
    break;
  case E_FPCR_REGNUM + 2:
    /* The gregset struct has noplace to put this: do nothing.  */
    break;
  default:  /* An error, obviously, but should we error out?  */
    break;
  case -1:
    for (i = 0; i < MN10300_ELF_NGREG; i++)
      am33_collect_gregset_method (regset, regcache, i, gregs, len);
    break;
  }
  return;
}

/* Copy fp register values from regcache to regset.  */

static void
am33_collect_fpregset_method (const struct regset *regset, 
                  const struct regcache *regcache, 
                  int regnum, void *fpregs, size_t len)
{
  mn10300_elf_fpregset_t *fpregset = (mn10300_elf_fpregset_t *) fpregs;

  gdb_assert (len >= sizeof (mn10300_elf_fpregset_t));

  if (regnum == -1)
    {
      int i;
      for (i = 0; i < MN10300_ELF_NFPREG; i++)
    am33_collect_fpregset_method (regset, regcache, E_FS0_REGNUM + i,
                                  fpregs, len);
      am33_collect_fpregset_method (regset, regcache, 
                    E_FPCR_REGNUM, fpregs, len);
    }
  else if (regnum == E_FPCR_REGNUM)
    regcache_raw_collect (regcache, E_FPCR_REGNUM, 
              &fpregset->fpcr);
  else if (E_FS0_REGNUM <= regnum
           && regnum < E_FS0_REGNUM + MN10300_ELF_NFPREG)
    regcache_raw_collect (regcache, regnum, 
              &fpregset->fpregs[regnum - E_FS0_REGNUM]);

  return;
}

static const struct regset am33_gregset =
  {
    NULL, am33_supply_gregset_method, am33_collect_gregset_method
  };

static const struct regset am33_fpregset =
  {
    NULL, am33_supply_fpregset_method, am33_collect_fpregset_method
  };

/* Iterate over core file register note sections.  */

static void
am33_iterate_over_regset_sections (struct gdbarch *gdbarch,
                   iterate_over_regset_sections_cb *cb,
                   void *cb_data,
                   const struct regcache *regcache)
{
  cb (".reg", sizeof (mn10300_elf_gregset_t), &am33_gregset,
      NULL, cb_data);
  cb (".reg2", sizeof(mn10300_elf_fpregset_t), &am33_fpregset,
      NULL, cb_data);
}

static void
am33_linux_sigframe_cache_init (const struct tramp_frame *self,
                                struct frame_info *this_frame,
                    struct trad_frame_cache *this_cache,
                    CORE_ADDR func);

static const struct tramp_frame am33_linux_sigframe = {
  SIGTRAMP_FRAME,
  1,
  {
    /* mov     119,d0 */
    { 0x2c, -1 },
    { 0x77, -1 },
    { 0x00, -1 },
    /* syscall 0 */
    { 0xf0, -1 },
    { 0xe0, -1 },
    { TRAMP_SENTINEL_INSN, -1 }
  },
  am33_linux_sigframe_cache_init
};

static const struct tramp_frame am33_linux_rt_sigframe = {
  SIGTRAMP_FRAME,
  1,
  {
    /* mov     173,d0 */
    { 0x2c, -1 },
    { 0xad, -1 },
    { 0x00, -1 },
    /* syscall 0 */
    { 0xf0, -1 },
    { 0xe0, -1 },
    { TRAMP_SENTINEL_INSN, -1 }
  },
  am33_linux_sigframe_cache_init
};

/* Relevant struct definitions for signal handling...

From arch/mn10300/kernel/sigframe.h:

struct sigframe
{
    void (*pretcode)(void);
    int sig;
    struct sigcontext *psc;
    struct sigcontext sc;
    struct fpucontext fpuctx;
    unsigned long extramask[_NSIG_WORDS-1];
    char retcode[8];
};

struct rt_sigframe
{
    void (*pretcode)(void);
    int sig;
    struct siginfo *pinfo;
    void *puc;
    struct siginfo info;
    struct ucontext uc;
    struct fpucontext fpuctx;
    char retcode[8];
};

From include/asm-mn10300/ucontext.h:

struct ucontext {
    unsigned long     uc_flags;
    struct ucontext  *uc_link;
    stack_t       uc_stack;
    struct sigcontext uc_mcontext;
    sigset_t      uc_sigmask;
};

From include/asm-mn10300/sigcontext.h:

struct fpucontext {
    unsigned long   fs[32];
    unsigned long   fpcr;
};

struct sigcontext {
    unsigned long   d0;
    unsigned long   d1;
    unsigned long   d2;
    unsigned long   d3;
    unsigned long   a0;
    unsigned long   a1;
    unsigned long   a2;
    unsigned long   a3;
    unsigned long   e0;
    unsigned long   e1;
    unsigned long   e2;
    unsigned long   e3;
    unsigned long   e4;
    unsigned long   e5;
    unsigned long   e6;
    unsigned long   e7;
    unsigned long   lar;
    unsigned long   lir;
    unsigned long   mdr;
    unsigned long   mcvf;
    unsigned long   mcrl;
    unsigned long   mcrh;
    unsigned long   mdrq;
    unsigned long   sp;
    unsigned long   epsw;
    unsigned long   pc;
    struct fpucontext *fpucontext;
    unsigned long   oldmask;
}; */


#define AM33_SIGCONTEXT_D0 0
#define AM33_SIGCONTEXT_D1 4
#define AM33_SIGCONTEXT_D2 8
#define AM33_SIGCONTEXT_D3 12
#define AM33_SIGCONTEXT_A0 16
#define AM33_SIGCONTEXT_A1 20
#define AM33_SIGCONTEXT_A2 24
#define AM33_SIGCONTEXT_A3 28
#define AM33_SIGCONTEXT_E0 32
#define AM33_SIGCONTEXT_E1 36
#define AM33_SIGCONTEXT_E2 40
#define AM33_SIGCONTEXT_E3 44
#define AM33_SIGCONTEXT_E4 48
#define AM33_SIGCONTEXT_E5 52
#define AM33_SIGCONTEXT_E6 56
#define AM33_SIGCONTEXT_E7 60
#define AM33_SIGCONTEXT_LAR 64
#define AM33_SIGCONTEXT_LIR 68
#define AM33_SIGCONTEXT_MDR 72
#define AM33_SIGCONTEXT_MCVF 76
#define AM33_SIGCONTEXT_MCRL 80
#define AM33_SIGCONTEXT_MCRH 84
#define AM33_SIGCONTEXT_MDRQ 88
#define AM33_SIGCONTEXT_SP 92
#define AM33_SIGCONTEXT_EPSW 96
#define AM33_SIGCONTEXT_PC 100
#define AM33_SIGCONTEXT_FPUCONTEXT 104


static void
am33_linux_sigframe_cache_init (const struct tramp_frame *self,
                                struct frame_info *this_frame,
                    struct trad_frame_cache *this_cache,
                    CORE_ADDR func)
{
  CORE_ADDR sc_base, fpubase;
  int i;

  sc_base = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
  if (self == &am33_linux_sigframe)
    {
      sc_base += 8;
      sc_base = get_frame_memory_unsigned (this_frame, sc_base, 4);
    }
  else
    {
      sc_base += 12;
      sc_base = get_frame_memory_unsigned (this_frame, sc_base, 4);
      sc_base += 20;
    }

  trad_frame_set_reg_addr (this_cache, E_D0_REGNUM,
                           sc_base + AM33_SIGCONTEXT_D0);
  trad_frame_set_reg_addr (this_cache, E_D1_REGNUM,
                           sc_base + AM33_SIGCONTEXT_D1);
  trad_frame_set_reg_addr (this_cache, E_D2_REGNUM,
                           sc_base + AM33_SIGCONTEXT_D2);
  trad_frame_set_reg_addr (this_cache, E_D3_REGNUM,
                           sc_base + AM33_SIGCONTEXT_D3);

  trad_frame_set_reg_addr (this_cache, E_A0_REGNUM,
                           sc_base + AM33_SIGCONTEXT_A0);
  trad_frame_set_reg_addr (this_cache, E_A1_REGNUM,
                           sc_base + AM33_SIGCONTEXT_A1);
  trad_frame_set_reg_addr (this_cache, E_A2_REGNUM,
                           sc_base + AM33_SIGCONTEXT_A2);
  trad_frame_set_reg_addr (this_cache, E_A3_REGNUM,
                           sc_base + AM33_SIGCONTEXT_A3);

  trad_frame_set_reg_addr (this_cache, E_E0_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E0);
  trad_frame_set_reg_addr (this_cache, E_E1_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E1);
  trad_frame_set_reg_addr (this_cache, E_E2_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E2);
  trad_frame_set_reg_addr (this_cache, E_E3_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E3);
  trad_frame_set_reg_addr (this_cache, E_E4_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E4);
  trad_frame_set_reg_addr (this_cache, E_E5_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E5);
  trad_frame_set_reg_addr (this_cache, E_E6_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E6);
  trad_frame_set_reg_addr (this_cache, E_E7_REGNUM,
                           sc_base + AM33_SIGCONTEXT_E7);

  trad_frame_set_reg_addr (this_cache, E_LAR_REGNUM,
                           sc_base + AM33_SIGCONTEXT_LAR);
  trad_frame_set_reg_addr (this_cache, E_LIR_REGNUM,
                           sc_base + AM33_SIGCONTEXT_LIR);
  trad_frame_set_reg_addr (this_cache, E_MDR_REGNUM,
                           sc_base + AM33_SIGCONTEXT_MDR);
  trad_frame_set_reg_addr (this_cache, E_MCVF_REGNUM,
                           sc_base + AM33_SIGCONTEXT_MCVF);
  trad_frame_set_reg_addr (this_cache, E_MCRL_REGNUM,
                           sc_base + AM33_SIGCONTEXT_MCRL);
  trad_frame_set_reg_addr (this_cache, E_MDRQ_REGNUM,
                           sc_base + AM33_SIGCONTEXT_MDRQ);

  trad_frame_set_reg_addr (this_cache, E_SP_REGNUM,
                           sc_base + AM33_SIGCONTEXT_SP);
  trad_frame_set_reg_addr (this_cache, E_PSW_REGNUM,
                           sc_base + AM33_SIGCONTEXT_EPSW);
  trad_frame_set_reg_addr (this_cache, E_PC_REGNUM,
                           sc_base + AM33_SIGCONTEXT_PC);

  fpubase = get_frame_memory_unsigned (this_frame,
                                       sc_base + AM33_SIGCONTEXT_FPUCONTEXT,
                       4);
  if (fpubase)
    {
      for (i = 0; i < 32; i++)
    {
      trad_frame_set_reg_addr (this_cache, E_FS0_REGNUM + i,
                               fpubase + 4 * i);
    }
      trad_frame_set_reg_addr (this_cache, E_FPCR_REGNUM, fpubase + 4 * 32);
    }

  trad_frame_set_id (this_cache, frame_id_build (sc_base, func));
}

/* AM33 GNU/Linux osabi has been recognized.
   Now's our chance to register our corefile handling.  */

static void
am33_linux_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  linux_init_abi (info, gdbarch);

  set_gdbarch_iterate_over_regset_sections
    (gdbarch, am33_iterate_over_regset_sections);
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

  tramp_frame_prepend_unwinder (gdbarch, &am33_linux_sigframe);
  tramp_frame_prepend_unwinder (gdbarch, &am33_linux_rt_sigframe);
}

void
_initialize_mn10300_linux_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_mn10300, 0,
              GDB_OSABI_LINUX, am33_linux_init_osabi);
}