149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/* Native-dependent code for SVR4 Unix running on i386's, for GDB.
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Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include <sys/procfs.h>
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/* The /proc interface divides the target machine's register set up into
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two different sets, the general register set (gregset) and the floating
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point register set (fpregset). For each set, there is an ioctl to get
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the current register set and another ioctl to set the current values.
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The actual structure passed through the ioctl interface is, of course,
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naturally machine dependent, and is different for each set of registers.
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For the i386 for example, the general register set is typically defined
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by:
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typedef int gregset_t[19]; (in <sys/regset.h>)
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#define GS 0 (in <sys/reg.h>)
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#define FS 1
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...
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#define UESP 17
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#define SS 18
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and the floating point set by:
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typedef struct fpregset
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{
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union
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{
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struct fpchip_state // fp extension state //
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{
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int state[27]; // 287/387 saved state //
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int status; // status word saved at exception //
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} fpchip_state;
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struct fp_emul_space // for emulators //
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{
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char fp_emul[246];
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char fp_epad[2];
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} fp_emul_space;
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int f_fpregs[62]; // union of the above //
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} fp_reg_set;
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long f_wregs[33]; // saved weitek state //
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} fpregset_t;
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These routines provide the packing and unpacking of gregset_t and
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fpregset_t formatted data.
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*/
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/* This is a duplicate of the table in i386-xdep.c. */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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};
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/* Given a pointer to a general register set in /proc format (gregset_t *),
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unpack the register contents and supply them as gdb's idea of the current
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register values. */
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void
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supply_gregset (gregsetp)
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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;
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extern int regmap[];
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for (regi = 0 ; regi < NUM_REGS ; regi++)
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{
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supply_register (regi, (char *) (regp + regmap[regi]));
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}
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}
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void
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fill_gregset (gregsetp, regno)
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gregset_t *gregsetp;
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int regno;
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{
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int regi;
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register greg_t *regp = (greg_t *) gregsetp;
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extern char registers[];
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extern int regmap[];
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for (regi = 0 ; regi < NUM_REGS ; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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*(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)];
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}
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}
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}
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#if defined (FP0_REGNUM)
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/* Given a pointer to a floating point register set in /proc format
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(fpregset_t *), unpack the register contents and supply them as gdb's
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idea of the current floating point register values. */
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void
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supply_fpregset (fpregsetp)
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fpregset_t *fpregsetp;
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{
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register int regi;
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/* FIXME: see m68k-tdep.c for an example, for the m68k. */
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}
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/* Given a pointer to a floating point register set in /proc format
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(fpregset_t *), update the register specified by REGNO from gdb's idea
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of the current floating point register set. If REGNO is -1, update
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them all. */
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void
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fill_fpregset (fpregsetp, regno)
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fpregset_t *fpregsetp;
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int regno;
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{
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int regi;
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char *to;
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char *from;
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extern char registers[];
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/* FIXME: see m68k-tdep.c for an example, for the m68k. */
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}
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#endif /* defined (FP0_REGNUM) */
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