339 lines
7.5 KiB
C
339 lines
7.5 KiB
C
/* Intel 386 native support.
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Copyright (C) 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 "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <stddef.h>
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#include <sys/ptrace.h>
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/* Does AIX define this in <errno.h>? */
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extern int errno;
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#ifndef NO_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include "ieee-float.h"
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#include "target.h"
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extern struct ext_format ext_format_i387;
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/* this table must line up with REGISTER_NAMES in tm-i386v.h */
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/* symbols like 'EAX' come from <sys/reg.h> */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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USP, 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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/* blockend is the value of u.u_ar0, and points to the
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* place where GS is stored
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*/
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int
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i386_register_u_addr (blockend, regnum)
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int blockend;
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int regnum;
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{
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#if 0
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/* this will be needed if fp registers are reinstated */
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/* for now, you can look at them with 'info float'
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* sys5 wont let you change them with ptrace anyway
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*/
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if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
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{
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int ubase, fpstate;
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struct user u;
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ubase = blockend + 4 * (SS + 1) - KSTKSZ;
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fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
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return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
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}
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else
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#endif
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return (blockend + 4 * regmap[regnum]);
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}
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/* The code below only work on the aix ps/2 (i386-ibm-aix) -
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* mtranle@paris - Sat Apr 11 10:34:12 1992
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*/
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struct env387
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{
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unsigned short control;
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unsigned short r0;
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unsigned short status;
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unsigned short r1;
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unsigned short tag;
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unsigned short r2;
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unsigned long eip;
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unsigned short code_seg;
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unsigned short opcode;
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unsigned long operand;
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unsigned short operand_seg;
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unsigned short r3;
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unsigned char regs[8][10];
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};
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static
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print_387_status (status, ep)
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unsigned short status;
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struct env387 *ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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unsigned char *p;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
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{
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if (bothstatus)
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printf ("u: ");
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print_387_status_word (status);
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}
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if (ep->status != 0)
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{
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if (bothstatus)
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printf ("e: ");
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print_387_status_word (ep->status);
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}
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print_387_control_word (ep->control);
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printf ("last exception: ");
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printf ("opcode %s; ", local_hex_string(ep->opcode));
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printf ("pc %s:", local_hex_string(ep->code_seg));
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printf ("%s; ", local_hex_string(ep->eip));
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printf ("operand %s", local_hex_string(ep->operand_seg));
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printf (":%s\n", local_hex_string(ep->operand));
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top = 7- ((ep->status >> 11) & 7);
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printf ("regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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double val;
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printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
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switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
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{
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case 0: printf ("valid "); break;
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case 1: printf ("zero "); break;
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case 2: printf ("trap "); break;
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case 3: printf ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf ("%02x", ep->regs[fpreg][i]);
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i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
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printf (" %#g\n", val);
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}
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}
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static struct env387 core_env387;
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void
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i386_float_info ()
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{
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struct env387 fps;
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int fpsaved = 0;
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if (inferior_pid)
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{
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char buf[10];
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unsigned short status;
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ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
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memcpy (&status, buf, sizeof (status));
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fpsaved = status;
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}
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else
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{
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if ((fpsaved = core_env387.status) != 0)
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memcpy(&fps, &core_env387, sizeof(fps));
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}
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if (fpsaved == 0)
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{
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printf ("no floating point status saved\n");
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return;
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}
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if (inferior_pid)
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{
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int offset;
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for (offset = 0; offset < sizeof(fps); offset += 10)
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{
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char buf[10];
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ptrace (PT_READ_FPR, inferior_pid, buf, offset);
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memcpy ((char *)&fps.control + offset, buf,
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MIN(10, sizeof(fps) - offset));
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}
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}
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print_387_status (0, (struct env387 *)&fps);
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}
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/* Fetch one register. */
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static void
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fetch_register (regno)
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int regno;
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{
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char buf[MAX_REGISTER_RAW_SIZE];
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if (regno < FP0_REGNUM)
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*(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
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PT_REG(regmap[regno]), 0, 0);
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else
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ptrace (PT_READ_FPR, inferior_pid, buf,
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(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
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supply_register (regno, buf);
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}
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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if (regno < 0)
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for (regno = 0; regno < NUM_REGS; regno++)
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fetch_register (regno);
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else
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fetch_register (regno);
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}
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/* store one register */
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static void
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store_register (regno)
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int regno;
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{
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char buf[80];
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extern char registers[];
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errno = 0;
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if (regno < FP0_REGNUM)
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ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
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*(int *) ®isters[REGISTER_BYTE (regno)], 0);
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else
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ptrace (PT_WRITE_FPR, inferior_pid, ®isters[REGISTER_BYTE (regno)],
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(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
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if (errno != 0)
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{
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sprintf (buf, "writing register number %d", regno);
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perror_with_name (buf);
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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store_inferior_registers (regno)
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int regno;
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{
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if (regno < 0)
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for (regno = 0; regno < NUM_REGS; regno++)
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store_register (regno);
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else
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store_register (regno);
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}
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#ifndef CD_AX /* defined in sys/i386/coredump.h */
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# define CD_AX 0
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# define CD_BX 1
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# define CD_CX 2
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# define CD_DX 3
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# define CD_SI 4
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# define CD_DI 5
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# define CD_BP 6
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# define CD_SP 7
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# define CD_FL 8
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# define CD_IP 9
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# define CD_CS 10
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# define CD_DS 11
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# define CD_ES 12
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# define CD_FS 13
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# define CD_GS 14
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# define CD_SS 15
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#endif
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/*
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* The order here in core_regmap[] has to be the same as in
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* regmap[] above.
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*/
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static int core_regmap[] =
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{
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CD_AX, CD_CX, CD_DX, CD_BX,
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CD_SP, CD_BP, CD_SI, CD_DI,
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CD_IP, CD_FL, CD_CS, CD_SS,
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CD_DS, CD_ES, CD_FS, CD_GS,
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};
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void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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unsigned int reg_addr; /* ignored */
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{
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if (which == 0)
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{
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/* Integer registers */
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#define cd_regs(n) ((int *)core_reg_sect)[n]
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#define regs(n) *((int *) ®isters[REGISTER_BYTE (n)])
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int i;
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for (i = 0; i < FP0_REGNUM; i++)
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regs(i) = cd_regs(core_regmap[i]);
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}
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else if (which == 2)
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{
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/* Floating point registers */
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if (core_reg_size >= sizeof (core_env387))
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memcpy (&core_env387, core_reg_sect, core_reg_size);
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else
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fprintf (stderr, "Couldn't read float regs from core file\n");
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}
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}
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