282 lines
8.6 KiB
C
282 lines
8.6 KiB
C
/* Native support for the SGI Iris running IRIX version 5, for GDB.
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Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
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1999, 2000, 2001, 2002 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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Modified for Irix 5.x by Ian Lance Taylor.
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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 "regcache.h"
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#include "gdb_string.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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#include "mips-tdep.h"
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static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);
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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 (gregset_t *gregsetp)
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{
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int regi;
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greg_t *regp = &(*gregsetp)[0];
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int gregoff = sizeof (greg_t) - mips_regsize (current_gdbarch);
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static char zerobuf[32] = {0};
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for (regi = 0; regi <= CTX_RA; regi++)
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supply_register (regi, (char *) (regp + regi) + gregoff);
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supply_register (mips_regnum (current_gdbarch)->pc,
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(char *) (regp + CTX_EPC) + gregoff);
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supply_register (mips_regnum (current_gdbarch)->hi,
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(char *) (regp + CTX_MDHI) + gregoff);
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supply_register (mips_regnum (current_gdbarch)->lo,
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(char *) (regp + CTX_MDLO) + gregoff);
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supply_register (mips_regnum (current_gdbarch)->cause,
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(char *) (regp + CTX_CAUSE) + gregoff);
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/* Fill inaccessible registers with zero. */
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supply_register (mips_regnum (current_gdbarch)->badvaddr, 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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greg_t *regp = &(*gregsetp)[0];
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/* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
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executable, we have to sign extend the registers to 64 bits before
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filling in the gregset structure. */
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for (regi = 0; regi <= CTX_RA; regi++)
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if ((regno == -1) || (regno == regi))
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*(regp + regi) =
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extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)],
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DEPRECATED_REGISTER_RAW_SIZE (regi));
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if ((regno == -1) || (regno == PC_REGNUM))
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*(regp + CTX_EPC) =
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extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
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DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->pc));
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if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
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*(regp + CTX_CAUSE) =
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extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->cause)],
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DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->cause));
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if ((regno == -1)
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|| (regno == mips_regnum (current_gdbarch)->hi))
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*(regp + CTX_MDHI) =
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extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
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DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->hi));
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if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
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*(regp + CTX_MDLO) =
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extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
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DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->lo));
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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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int regi;
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static char zerobuf[32] = {0};
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/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
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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 (mips_regnum (current_gdbarch)->fp_control_status,
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(char *) &fpregsetp->fp_csr);
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/* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
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supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
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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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/* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
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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[DEPRECATED_REGISTER_BYTE (regi)];
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to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
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memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regi));
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}
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}
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if ((regno == -1)
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|| (regno == mips_regnum (current_gdbarch)->fp_control_status))
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fpregsetp->fp_csr = *(unsigned *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)];
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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 5, 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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memcpy ((char *) deprecated_registers, core_reg_sect, core_reg_size);
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}
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else if (mips_regsize (current_gdbarch) == 4 &&
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core_reg_size == (2 * mips_regsize (current_gdbarch)) * NUM_REGS)
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{
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/* This is a core file from a N32 executable, 64 bits are saved
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for all registers. */
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char *srcp = core_reg_sect;
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char *dstp = deprecated_registers;
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int regno;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32))
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{
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/* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
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currently assumes that they are 32 bit. */
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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if (DEPRECATED_REGISTER_RAW_SIZE (regno) == 4)
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{
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/* copying 4 bytes from eight bytes?
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I don't see how this can be right... */
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srcp += 4;
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}
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else
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{
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/* copy all 8 bytes (sizeof(double)) */
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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}
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}
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else
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{
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srcp += 4;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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*dstp++ = *srcp++;
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}
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}
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}
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else
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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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deprecated_registers_fetched ();
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}
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/* Register that we are able to handle irix5 core file formats.
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This really is bfd_target_unknown_flavour */
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static struct core_fns irix5_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_irix5 (void)
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{
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add_core_fns (&irix5_core_fns);
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}
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