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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [mipsv4-nat.c] - Blame information for rev 1765

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1 104 markom
/* Native support for MIPS running SVR4, for GDB.
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   Copyright 1994, 1995 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include <sys/time.h>
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#include <sys/procfs.h>
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#include <setjmp.h>             /* For JB_XXX.  */
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 4
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/*
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 * See the comment in m68k-tdep.c regarding the utility of these functions.
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 *
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 * These definitions are from the MIPS SVR4 ABI, so they may work for
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 * any MIPS SVR4 target.
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 */
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void
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supply_gregset (gregsetp)
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     gregset_t *gregsetp;
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{
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  register int regi;
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  register greg_t *regp = &(*gregsetp)[0];
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  static char zerobuf[MAX_REGISTER_RAW_SIZE] =
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  {0};
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  for (regi = 0; regi <= CXT_RA; regi++)
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    supply_register (regi, (char *) (regp + regi));
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  supply_register (PC_REGNUM, (char *) (regp + CXT_EPC));
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  supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI));
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  supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO));
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  supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE));
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  /* Fill inaccessible registers with zero.  */
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  supply_register (PS_REGNUM, zerobuf);
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  supply_register (BADVADDR_REGNUM, zerobuf);
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  supply_register (FP_REGNUM, zerobuf);
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  supply_register (UNUSED_REGNUM, zerobuf);
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  for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
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    supply_register (regi, zerobuf);
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}
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void
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fill_gregset (gregsetp, regno)
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     gregset_t *gregsetp;
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     int regno;
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{
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  int regi;
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  register greg_t *regp = &(*gregsetp)[0];
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  for (regi = 0; regi <= 32; regi++)
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    if ((regno == -1) || (regno == regi))
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      *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
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  if ((regno == -1) || (regno == PC_REGNUM))
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    *(regp + CXT_EPC) = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
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  if ((regno == -1) || (regno == CAUSE_REGNUM))
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    *(regp + CXT_CAUSE) = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
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  if ((regno == -1) || (regno == HI_REGNUM))
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    *(regp + CXT_MDHI) = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
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  if ((regno == -1) || (regno == LO_REGNUM))
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    *(regp + CXT_MDLO) = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
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}
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/*
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 * Now we do the same thing for floating-point registers.
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 * We don't bother to condition on FP0_REGNUM since any
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 * reasonable MIPS configuration has an R3010 in it.
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 *
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 * Again, see the comments in m68k-tdep.c.
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 */
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void
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supply_fpregset (fpregsetp)
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     fpregset_t *fpregsetp;
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{
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  register int regi;
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  static char zerobuf[MAX_REGISTER_RAW_SIZE] =
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  {0};
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  for (regi = 0; regi < 32; regi++)
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    supply_register (FP0_REGNUM + regi,
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                     (char *) &fpregsetp->fp_r.fp_regs[regi]);
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  supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
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  /* FIXME: how can we supply FCRIR_REGNUM?  The ABI doesn't tell us. */
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  supply_register (FCRIR_REGNUM, zerobuf);
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}
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void
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fill_fpregset (fpregsetp, regno)
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     fpregset_t *fpregsetp;
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     int regno;
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{
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  int regi;
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  char *from, *to;
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  for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
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    {
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      if ((regno == -1) || (regno == regi))
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        {
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          from = (char *) &registers[REGISTER_BYTE (regi)];
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          to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
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          memcpy (to, from, REGISTER_RAW_SIZE (regi));
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        }
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    }
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  if ((regno == -1) || (regno == FCRCS_REGNUM))
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    fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
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}
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/* Figure out where the longjmp will land.
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   We expect the first arg to be a pointer to the jmp_buf structure from which
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   we extract the pc (_JB_PC) that we will land at.  The pc is copied into PC.
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   This routine returns true on success. */
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int
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get_longjmp_target (pc)
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     CORE_ADDR *pc;
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{
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  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
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  CORE_ADDR jb_addr;
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  jb_addr = read_register (A0_REGNUM);
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  if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf,
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                          TARGET_PTR_BIT / TARGET_CHAR_BIT))
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    return 0;
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  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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  return 1;
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}

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