279 lines
8.4 KiB
C
279 lines
8.4 KiB
C
/* Native support for the SGI Iris running IRIX version 5, for GDB.
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Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
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1998, 1999, 2000, 2001, 2002, 2004, 2006 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., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, 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_isa_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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regcache_raw_supply (current_regcache, regi,
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(char *) (regp + regi) + gregoff);
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regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->pc,
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(char *) (regp + CTX_EPC) + gregoff);
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regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->hi,
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(char *) (regp + CTX_MDHI) + gregoff);
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regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->lo,
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(char *) (regp + CTX_MDLO) + gregoff);
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regcache_raw_supply (current_regcache, 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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regcache_raw_supply (current_regcache, 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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LONGEST regval;
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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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{
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regcache_raw_read_signed (current_regcache, regi, ®val);
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*(regp + regi) = regval;
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}
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if ((regno == -1) || (regno == PC_REGNUM))
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{
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regcache_raw_read_signed
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(current_regcache, mips_regnum (current_gdbarch)->pc, ®val);
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*(regp + CTX_EPC) = regval;
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}
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if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
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{
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regcache_raw_read_signed
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(current_regcache, mips_regnum (current_gdbarch)->cause, ®val);
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*(regp + CTX_CAUSE) = regval;
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}
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if ((regno == -1)
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|| (regno == mips_regnum (current_gdbarch)->hi))
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{
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regcache_raw_read_signed
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(current_regcache, mips_regnum (current_gdbarch)->hi, ®val);
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*(regp + CTX_MDHI) = regval;
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}
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if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
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{
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regcache_raw_read_signed
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(current_regcache, mips_regnum (current_gdbarch)->lo, ®val);
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*(regp + CTX_MDLO) = regval;
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}
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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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char fsrbuf[8];
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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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regcache_raw_supply (current_regcache, FP0_REGNUM + regi,
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(char *) &fpregsetp->fp_r.fp_regs[regi]);
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/* We can't supply the FSR register directly to the regcache,
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because there is a size issue: On one hand, fpregsetp->fp_csr
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is 32bits long, while the regcache expects a 64bits long value.
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So we use a buffer of the correct size and copy into it the register
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value at the proper location. */
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memset (fsrbuf, 0, 4);
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memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
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regcache_raw_supply (current_regcache,
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mips_regnum (current_gdbarch)->fp_control_status,
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fsrbuf);
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/* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
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regcache_raw_supply (current_regcache,
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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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to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
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regcache_raw_read (current_regcache, regi, to);
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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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{
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char fsrbuf[8];
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/* We can't fill the FSR register directly from the regcache,
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because there is a size issue: On one hand, fpregsetp->fp_csr
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is 32bits long, while the regcache expects a 64bits long buffer.
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So we use a buffer of the correct size and copy the register
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value from that buffer. */
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regcache_raw_read (current_regcache,
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mips_regnum (current_gdbarch)->fp_control_status,
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fsrbuf);
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memcpy (&fpregsetp->fp_csr, fsrbuf + 4, 4);
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}
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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 (MIPS_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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char *srcp = core_reg_sect;
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int regsize = mips_isa_regsize (current_gdbarch);
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int regno;
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/* If regsize is 8, this is a N32 or N64 core file.
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If regsize is 4, this is an O32 core file. */
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if (core_reg_size != regsize * NUM_REGS)
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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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for (regno = 0; regno < NUM_REGS; regno++)
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{
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regcache_raw_write (current_regcache, regno, srcp);
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srcp += regsize;
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}
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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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deprecated_add_core_fns (&irix5_core_fns);
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}
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