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/* Native support for the SGI Iris running IRIX version 4, for GDB.
Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1995
Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
Implemented for Irix 4.x by Garrett A. Wollman.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include <sys/time.h>
#include <sys/procfs.h>
#include <setjmp.h> /* For JB_XXX. */
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* Size of elements in jmpbuf */
#define JB_ELEMENT_SIZE 4
typedef unsigned int greg_t; /* why isn't this defined? */
static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
/*
* See the comment in m68k-tdep.c regarding the utility of these functions.
*/
void
supply_gregset (gregset_t *gregsetp)
{
register int regi;
register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
static char zerobuf[MAX_REGISTER_RAW_SIZE] =
{0};
/* FIXME: somewhere, there should be a #define for the meaning
of this magic number 32; we should use that. */
for (regi = 0; regi < 32; regi++)
supply_register (regi, (char *) (regp + regi));
supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
/* Fill inaccessible registers with zero. */
supply_register (BADVADDR_REGNUM, zerobuf);
}
void
fill_gregset (gregset_t *gregsetp, int regno)
{
int regi;
register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
/* same FIXME as above wrt 32 */
for (regi = 0; regi < 32; regi++)
if ((regno == -1) || (regno == regi))
*(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
if ((regno == -1) || (regno == PC_REGNUM))
gregsetp->gp_pc = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
if ((regno == -1) || (regno == CAUSE_REGNUM))
gregsetp->gp_cause = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
if ((regno == -1) || (regno == HI_REGNUM))
gregsetp->gp_mdhi = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
if ((regno == -1) || (regno == LO_REGNUM))
gregsetp->gp_mdlo = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
}
/*
* Now we do the same thing for floating-point registers.
* We don't bother to condition on FP0_REGNUM since any
* reasonable MIPS configuration has an R3010 in it.
*
* Again, see the comments in m68k-tdep.c.
*/
void
supply_fpregset (fpregset_t *fpregsetp)
{
register int regi;
static char zerobuf[MAX_REGISTER_RAW_SIZE] =
{0};
for (regi = 0; regi < 32; regi++)
supply_register (FP0_REGNUM + regi,
(char *) &fpregsetp->fp_r.fp_regs[regi]);
supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
/* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
supply_register (FCRIR_REGNUM, zerobuf);
}
void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
int regi;
char *from, *to;
for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
{
if ((regno == -1) || (regno == regi))
{
from = (char *) ®isters[REGISTER_BYTE (regi)];
to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
memcpy (to, from, REGISTER_RAW_SIZE (regi));
}
}
if ((regno == -1) || (regno == FCRCS_REGNUM))
fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE (FCRCS_REGNUM)];
}
/* Figure out where the longjmp will land.
We expect the first arg to be a pointer to the jmp_buf structure from which
we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
This routine returns true on success. */
int
get_longjmp_target (CORE_ADDR *pc)
{
char *buf;
CORE_ADDR jb_addr;
buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
jb_addr = read_register (A0_REGNUM);
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
return 1;
}
/* Provide registers to GDB from a core file.
CORE_REG_SECT points to an array of bytes, which were obtained from
a core file which BFD thinks might contain register contents.
CORE_REG_SIZE is its size.
Normally, WHICH says which register set corelow suspects this is:
0 --- the general-purpose register set
2 --- the floating-point register set
However, for Irix 4, WHICH isn't used.
REG_ADDR is also unused. */
static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
int which, CORE_ADDR reg_addr)
{
if (core_reg_size != REGISTER_BYTES)
{
warning ("wrong size gregset struct in core file");
return;
}
memcpy ((char *) registers, core_reg_sect, core_reg_size);
}
/* Register that we are able to handle irix4 core file formats.
FIXME: is this really bfd_target_unknown_flavour? */
static struct core_fns irix4_core_fns =
{
bfd_target_unknown_flavour, /* core_flavour */
default_check_format, /* check_format */
default_core_sniffer, /* core_sniffer */
fetch_core_registers, /* core_read_registers */
NULL /* next */
};
void
_initialize_core_irix4 (void)
{
add_core_fns (&irix4_core_fns);
}
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