280 lines
8.4 KiB
C
280 lines
8.4 KiB
C
/* Native support for the SGI Iris running IRIX version 5, for GDB.
|
|
|
|
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
|
|
1998, 1999, 2000, 2001, 2002, 2004, 2006 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.
|
|
Modified for Irix 5.x by Ian Lance Taylor.
|
|
|
|
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., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#include "defs.h"
|
|
#include "inferior.h"
|
|
#include "gdbcore.h"
|
|
#include "target.h"
|
|
#include "regcache.h"
|
|
|
|
#include "gdb_string.h"
|
|
#include <sys/time.h>
|
|
#include <sys/procfs.h>
|
|
#include <setjmp.h> /* For JB_XXX. */
|
|
|
|
/* Prototypes for supply_gregset etc. */
|
|
#include "gregset.h"
|
|
#include "mips-tdep.h"
|
|
|
|
static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
|
|
|
|
/* 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)
|
|
{
|
|
int regi;
|
|
greg_t *regp = &(*gregsetp)[0];
|
|
int gregoff = sizeof (greg_t) - mips_isa_regsize (current_gdbarch);
|
|
static char zerobuf[32] = {0};
|
|
|
|
for (regi = 0; regi <= CTX_RA; regi++)
|
|
regcache_raw_supply (current_regcache, regi,
|
|
(char *) (regp + regi) + gregoff);
|
|
|
|
regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->pc,
|
|
(char *) (regp + CTX_EPC) + gregoff);
|
|
regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->hi,
|
|
(char *) (regp + CTX_MDHI) + gregoff);
|
|
regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->lo,
|
|
(char *) (regp + CTX_MDLO) + gregoff);
|
|
regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->cause,
|
|
(char *) (regp + CTX_CAUSE) + gregoff);
|
|
|
|
/* Fill inaccessible registers with zero. */
|
|
regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->badvaddr, zerobuf);
|
|
}
|
|
|
|
void
|
|
fill_gregset (gregset_t *gregsetp, int regno)
|
|
{
|
|
int regi;
|
|
greg_t *regp = &(*gregsetp)[0];
|
|
LONGEST regval;
|
|
|
|
/* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
|
|
executable, we have to sign extend the registers to 64 bits before
|
|
filling in the gregset structure. */
|
|
|
|
for (regi = 0; regi <= CTX_RA; regi++)
|
|
if ((regno == -1) || (regno == regi))
|
|
{
|
|
regcache_raw_read_signed (current_regcache, regi, ®val);
|
|
*(regp + regi) = regval;
|
|
}
|
|
|
|
if ((regno == -1) || (regno == PC_REGNUM))
|
|
{
|
|
regcache_raw_read_signed
|
|
(current_regcache, mips_regnum (current_gdbarch)->pc, ®val);
|
|
*(regp + CTX_EPC) = regval;
|
|
}
|
|
|
|
if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
|
|
{
|
|
regcache_raw_read_signed
|
|
(current_regcache, mips_regnum (current_gdbarch)->cause, ®val);
|
|
*(regp + CTX_CAUSE) = regval;
|
|
}
|
|
|
|
if ((regno == -1)
|
|
|| (regno == mips_regnum (current_gdbarch)->hi))
|
|
{
|
|
regcache_raw_read_signed
|
|
(current_regcache, mips_regnum (current_gdbarch)->hi, ®val);
|
|
*(regp + CTX_MDHI) = regval;
|
|
}
|
|
|
|
if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
|
|
{
|
|
regcache_raw_read_signed
|
|
(current_regcache, mips_regnum (current_gdbarch)->lo, ®val);
|
|
*(regp + CTX_MDLO) = regval;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int regi;
|
|
static char zerobuf[32] = {0};
|
|
char fsrbuf[8];
|
|
|
|
/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
|
|
|
|
for (regi = 0; regi < 32; regi++)
|
|
regcache_raw_supply (current_regcache, FP0_REGNUM + regi,
|
|
(char *) &fpregsetp->fp_r.fp_regs[regi]);
|
|
|
|
/* We can't supply the FSR register directly to the regcache,
|
|
because there is a size issue: On one hand, fpregsetp->fp_csr
|
|
is 32bits long, while the regcache expects a 64bits long value.
|
|
So we use a buffer of the correct size and copy into it the register
|
|
value at the proper location. */
|
|
memset (fsrbuf, 0, 4);
|
|
memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
|
|
|
|
regcache_raw_supply (current_regcache,
|
|
mips_regnum (current_gdbarch)->fp_control_status,
|
|
fsrbuf);
|
|
|
|
/* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
|
|
regcache_raw_supply (current_regcache,
|
|
mips_regnum (current_gdbarch)->fp_implementation_revision,
|
|
zerobuf);
|
|
}
|
|
|
|
void
|
|
fill_fpregset (fpregset_t *fpregsetp, int regno)
|
|
{
|
|
int regi;
|
|
char *from, *to;
|
|
|
|
/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
|
|
|
|
for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
|
|
{
|
|
if ((regno == -1) || (regno == regi))
|
|
{
|
|
to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
|
|
regcache_raw_read (current_regcache, regi, to);
|
|
}
|
|
}
|
|
|
|
if (regno == -1
|
|
|| regno == mips_regnum (current_gdbarch)->fp_control_status)
|
|
{
|
|
char fsrbuf[8];
|
|
|
|
/* We can't fill the FSR register directly from the regcache,
|
|
because there is a size issue: On one hand, fpregsetp->fp_csr
|
|
is 32bits long, while the regcache expects a 64bits long buffer.
|
|
So we use a buffer of the correct size and copy the register
|
|
value from that buffer. */
|
|
regcache_raw_read (current_regcache,
|
|
mips_regnum (current_gdbarch)->fp_control_status,
|
|
fsrbuf);
|
|
|
|
memcpy (&fpregsetp->fp_csr, fsrbuf + 4, 4);
|
|
}
|
|
}
|
|
|
|
|
|
/* 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 (MIPS_A0_REGNUM);
|
|
|
|
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
|
|
TARGET_PTR_BIT / TARGET_CHAR_BIT))
|
|
return 0;
|
|
|
|
*pc = extract_unsigned_integer (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 5, 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)
|
|
{
|
|
char *srcp = core_reg_sect;
|
|
int regsize = mips_isa_regsize (current_gdbarch);
|
|
int regno;
|
|
|
|
/* If regsize is 8, this is a N32 or N64 core file.
|
|
If regsize is 4, this is an O32 core file. */
|
|
if (core_reg_size != regsize * NUM_REGS)
|
|
{
|
|
warning (_("wrong size gregset struct in core file"));
|
|
return;
|
|
}
|
|
|
|
for (regno = 0; regno < NUM_REGS; regno++)
|
|
{
|
|
regcache_raw_write (current_regcache, regno, srcp);
|
|
srcp += regsize;
|
|
}
|
|
}
|
|
|
|
/* Register that we are able to handle irix5 core file formats.
|
|
This really is bfd_target_unknown_flavour */
|
|
|
|
static struct core_fns irix5_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_irix5 (void)
|
|
{
|
|
deprecated_add_core_fns (&irix5_core_fns);
|
|
}
|