208 lines
6.1 KiB
C
208 lines
6.1 KiB
C
/* Native support for the SGI Iris running IRIX version 4, for GDB.
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Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1995, 1996, 1999, 2000,
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2001 Free Software Foundation, Inc.
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Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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Implemented for Irix 4.x by Garrett A. Wollman.
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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 "regcache.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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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 4
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typedef unsigned int greg_t; /* why isn't this defined? */
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static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
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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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void
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supply_gregset (gregset_t *gregsetp)
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{
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register int regi;
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register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
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char zerobuf[MAX_REGISTER_SIZE];
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memset (zerobuf, 0, MAX_REGISTER_SIZE);
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/* FIXME: somewhere, there should be a #define for the meaning
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of this magic number 32; we should use that. */
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for (regi = 0; regi < 32; regi++)
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supply_register (regi, (char *) (regp + regi));
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supply_register (PC_REGNUM, (char *) &(gregsetp->gp_pc));
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supply_register (HI_REGNUM, (char *) &(gregsetp->gp_mdhi));
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supply_register (LO_REGNUM, (char *) &(gregsetp->gp_mdlo));
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supply_register (CAUSE_REGNUM, (char *) &(gregsetp->gp_cause));
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/* Fill inaccessible registers with zero. */
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supply_register (BADVADDR_REGNUM, zerobuf);
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}
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void
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fill_gregset (gregset_t *gregsetp, int regno)
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{
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int regi;
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register greg_t *regp = (greg_t *) (gregsetp->gp_regs);
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/* same FIXME as above wrt 32 */
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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 *) & deprecated_registers[REGISTER_BYTE (regi)];
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if ((regno == -1) || (regno == PC_REGNUM))
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gregsetp->gp_pc = *(greg_t *) & deprecated_registers[REGISTER_BYTE (PC_REGNUM)];
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if ((regno == -1) || (regno == CAUSE_REGNUM))
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gregsetp->gp_cause = *(greg_t *) & deprecated_registers[REGISTER_BYTE (CAUSE_REGNUM)];
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if ((regno == -1) || (regno == HI_REGNUM))
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gregsetp->gp_mdhi = *(greg_t *) & deprecated_registers[REGISTER_BYTE (HI_REGNUM)];
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if ((regno == -1) || (regno == LO_REGNUM))
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gregsetp->gp_mdlo = *(greg_t *) & deprecated_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 (fpregset_t *fpregsetp)
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{
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register int regi;
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char zerobuf[MAX_REGISTER_SIZE];
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memset (zerobuf, 0, MAX_REGISTER_SIZE);
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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? SGI 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 (fpregset_t *fpregsetp, 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 *) &deprecated_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 *) &deprecated_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 (CORE_ADDR *pc)
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{
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char *buf;
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CORE_ADDR jb_addr;
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buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
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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_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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return 1;
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}
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/* Provide registers to GDB from a core file.
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CORE_REG_SECT points to an array of bytes, which were obtained from
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a core file which BFD thinks might contain register contents.
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CORE_REG_SIZE is its size.
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Normally, WHICH says which register set corelow suspects this is:
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0 --- the general-purpose register set
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2 --- the floating-point register set
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However, for Irix 4, WHICH isn't used.
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REG_ADDR is also unused. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR reg_addr)
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{
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if (core_reg_size != DEPRECATED_REGISTER_BYTES)
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{
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warning ("wrong size gregset struct in core file");
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return;
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}
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memcpy ((char *) deprecated_registers, core_reg_sect, core_reg_size);
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}
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/* Register that we are able to handle irix4 core file formats.
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FIXME: is this really bfd_target_unknown_flavour? */
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static struct core_fns irix4_core_fns =
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{
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bfd_target_unknown_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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void
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_initialize_core_irix4 (void)
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{
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add_core_fns (&irix4_core_fns);
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}
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