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/* Native support for MIPS running SVR4, for GDB.
Copyright 1994, 1995, 2000, 2001 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
(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 "target.h"
#include "regcache.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
/*
* See the comment in m68k-tdep.c regarding the utility of these functions.
*
* These definitions are from the MIPS SVR4 ABI, so they may work for
* any MIPS SVR4 target.
*/
void
supply_gregset (gregset_t *gregsetp)
{
register int regi;
register greg_t *regp = &(*gregsetp)[0];
static char zerobuf[MAX_REGISTER_RAW_SIZE] =
{0};
for (regi = 0; regi <= CXT_RA; regi++)
supply_register (regi, (char *) (regp + regi));
supply_register (PC_REGNUM, (char *) (regp + CXT_EPC));
supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI));
supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO));
supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE));
/* Fill inaccessible registers with zero. */
supply_register (PS_REGNUM, zerobuf);
supply_register (BADVADDR_REGNUM, zerobuf);
supply_register (FP_REGNUM, zerobuf);
supply_register (UNUSED_REGNUM, zerobuf);
for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
supply_register (regi, zerobuf);
}
void
fill_gregset (gregset_t *gregsetp, int regno)
{
int regi;
register greg_t *regp = &(*gregsetp)[0];
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))
*(regp + CXT_EPC) = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
if ((regno == -1) || (regno == CAUSE_REGNUM))
*(regp + CXT_CAUSE) = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
if ((regno == -1) || (regno == HI_REGNUM))
*(regp + CXT_MDHI) = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
if ((regno == -1) || (regno == LO_REGNUM))
*(regp + CXT_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? The ABI 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;
}
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