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251 lines
6.8 KiB
C
251 lines
6.8 KiB
C
/* Native-dependent code for SVR4 Unix running on i386's, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1996, 1998 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., 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 "value.h"
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#include "inferior.h"
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#ifdef HAVE_SYS_PROCFS_H
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#include <sys/procfs.h>
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/* Prototypes for supply_gregset etc. */
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#include "gregset.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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#ifdef HAVE_GREGSET_T
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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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/* Prototypes for local functions */
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void fill_gregset (gregset_t *, int);
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void supply_gregset (gregset_t *);
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void supply_fpregset (fpregset_t *);
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void fill_fpregset (fpregset_t *, int);
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/* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS)
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being less than or equal to the number of registers that can be stored
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in a gregset_t. Note that with the current scheme there will typically
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be more registers actually stored in a gregset_t that what we know
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about. This is bogus and should be fixed. */
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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 (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 - NUM_FREGS); 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 (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;
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extern int regmap[];
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for (regi = 0; regi < (NUM_REGS - NUM_FREGS); 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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#endif /* HAVE_GREGSET_T */
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#if defined (HAVE_FPREGSET_T)
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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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/* FIXME: Assumes that fpregsetp contains an i387 FSAVE area. */
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static const int freg_offset_map[] =
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{
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#if !defined(FPREGSET_FSAVE_OFFSET)
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#define FPREGSET_FSAVE_OFFSET 0
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#endif
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FPREGSET_FSAVE_OFFSET + 28 + 0 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 1 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 2 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 3 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 4 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 5 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 6 * 10,
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FPREGSET_FSAVE_OFFSET + 28 + 7 * 10,
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FPREGSET_FSAVE_OFFSET + 0,
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FPREGSET_FSAVE_OFFSET + 4,
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FPREGSET_FSAVE_OFFSET + 8,
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FPREGSET_FSAVE_OFFSET + 16,
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FPREGSET_FSAVE_OFFSET + 12,
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FPREGSET_FSAVE_OFFSET + 24,
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FPREGSET_FSAVE_OFFSET + 20,
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FPREGSET_FSAVE_OFFSET + 16
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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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if (NUM_FREGS == 0)
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return;
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for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
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{
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char tbuf[4];
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ULONGEST tval;
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char *from = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
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if (regi == FCS_REGNUM)
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{
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tval = extract_unsigned_integer (from, 4) & 0xffff;
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store_unsigned_integer (tbuf, 4, tval);
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supply_register (regi, tbuf);
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}
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else if (regi == FOP_REGNUM)
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{
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tval = (extract_unsigned_integer (from, 4) >> 16) & ((1 << 11) - 1);
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store_unsigned_integer (tbuf, 4, tval);
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supply_register (regi, tbuf);
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}
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else
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supply_register (regi, from);
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}
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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 (fpregset_t *fpregsetp, int regno)
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{
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int regi;
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if (NUM_FREGS == 0)
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return;
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for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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char *to = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
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char *from = (char *) ®isters[REGISTER_BYTE (regi)];
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ULONGEST valto;
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ULONGEST valfrom;
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if (regi == FCS_REGNUM)
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{
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valto = extract_unsigned_integer (to, 4);
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valfrom = extract_unsigned_integer (from, 4);
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valto = (valto & ~0xffff) | (valfrom & 0xffff);
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store_unsigned_integer (to, 4, valto);
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}
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else if (regi == FOP_REGNUM)
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{
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valto = extract_unsigned_integer (to, 4);
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valfrom = extract_unsigned_integer (from, 4);
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valto = (valto & 0xffff) | ((valfrom & ((1 << 11) - 1)) << 16);
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store_unsigned_integer (to, 4, valto);
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}
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else
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{
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memcpy (to, from, REGISTER_RAW_SIZE (regi));
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}
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}
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}
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}
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#endif /* defined (HAVE_FPREGSET_T) */
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#endif /* HAVE_SYS_PROCFS_H */
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