164 lines
4.9 KiB
C
164 lines
4.9 KiB
C
/* Native-dependent code for Unix SVR4 running on i386's.
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Copyright (C) 1988-2018 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 3 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, see <http://www.gnu.org/licenses/>. */
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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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#include "regcache.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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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#ifdef HAVE_SYS_PROCFS_H
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#include <sys/procfs.h>
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/* We must not compile this code for 64-bit Solaris x86. */
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#if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32)
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#include "gregset.h"
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/* The `/proc' interface divides the target machine's register set up
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into two different sets, the general purpose register set (gregset)
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and the floating-point register set (fpregset). For each set,
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there is an ioctl to get the current register set and another ioctl
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to set the current values.
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The actual structure passed through the ioctl interface is, of
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course, naturally machine dependent, and is different for each set
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of registers. For the i386 for example, the general-purpose
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register set is typically defined 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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union {
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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 //
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// 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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Incidentally fpchip_state contains the FPU state in the same format
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as used by the "fsave" instruction, and that's the only thing we
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support here. I don't know how the emulator stores it state. The
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Weitek stuff definitely isn't supported.
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The routines defined here, provide the packing and unpacking of
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gregset_t and fpregset_t formatted data. */
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#ifdef HAVE_GREGSET_T
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/* Mapping between the general-purpose registers in `/proc'
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format and GDB's register array layout. */
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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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/* Fill GDB's register array with the general-purpose register values
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in *GREGSETP. */
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void
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supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
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{
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const greg_t *regp = (const greg_t *) gregsetp;
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int regnum;
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for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
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regcache_raw_supply (regcache, regnum, regp + regmap[regnum]);
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}
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/* Fill register REGNUM (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNUM is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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gregset_t *gregsetp, int regnum)
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{
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greg_t *regp = (greg_t *) gregsetp;
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int i;
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for (i = 0; i < I386_NUM_GREGS; i++)
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if (regnum == -1 || regnum == i)
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regcache_raw_collect (regcache, i, regp + regmap[i]);
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}
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#endif /* HAVE_GREGSET_T */
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#ifdef HAVE_FPREGSET_T
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/* Fill GDB's register array with the floating-point register values in
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*FPREGSETP. */
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void
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supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
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{
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if (gdbarch_fp0_regnum (regcache->arch ()) == 0)
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return;
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i387_supply_fsave (regcache, -1, fpregsetp);
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}
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/* Fill register REGNO (if it is a floating-point register) in
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*FPREGSETP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache,
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fpregset_t *fpregsetp, int regno)
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{
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if (gdbarch_fp0_regnum (regcache->arch ()) == 0)
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return;
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i387_collect_fsave (regcache, regno, fpregsetp);
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}
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#endif /* HAVE_FPREGSET_T */
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#endif /* not 64-bit. */
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#endif /* HAVE_SYS_PROCFS_H */
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