ea8c7ac7d0
This is a greatly pared down version of the full gdb-4.12, all the config stuff has been removed and the supporting libraries have been stripped to a minimum. This is a 1.1.5 only port, I'll do a more complete port for 2.0 which will have all the config stuff and will install the gnu support libraries as system libraries like we do for readline. There wasn't much point for 1.1.5 since only gdb would use them so I went for saving space instead. For 2.0 I'll config all the other gnu tools to use them as well.
324 lines
8.3 KiB
C
324 lines
8.3 KiB
C
/* Native-dependent code for BSD 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 <machine/reg.h>
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/* this table must line up with REGISTER_NAMES in tm-i386.h */
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/* symbols like 'tEAX' come from <machine/reg.h> */
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static int tregmap[] =
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{
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tEAX, tECX, tEDX, tEBX,
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tESP, tEBP, tESI, tEDI,
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tEIP, tEFLAGS, tCS, tSS
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};
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#ifdef sEAX
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static int sregmap[] =
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{
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sEAX, sECX, sEDX, sEBX,
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sESP, sEBP, sESI, sEDI,
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sEIP, sEFLAGS, sCS, sSS
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};
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#endif
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/* blockend is the value of u.u_ar0, and points to the
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place where ES is stored. */
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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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/* The following condition is a kludge to get at the proper register map
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depending upon the state of pcb_flag.
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The proper condition would be
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if (u.u_pcb.pcb_flag & FM_TRAP)
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but that would require a ptrace call here and wouldn't work
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for corefiles. */
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#ifdef sEAX
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if (blockend < 0x1fcc)
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return (blockend + 4 * tregmap[regnum]);
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else
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return (blockend + 4 * sregmap[regnum]);
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#else
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return (blockend + 4 * tregmap[regnum]);
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#endif
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}
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#ifdef FLOAT_INFO
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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/ioctl.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */
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#include <sys/user.h>
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#undef curpcb
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/ptrace.h>
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#define fpstate save87
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#define U_FPSTATE(u) u.u_pcb.pcb_savefpu
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i387_to_double (from, to)
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char *from;
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char *to;
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{
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long *lp;
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/* push extended mode on 387 stack, then pop in double mode
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*
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* first, set exception masks so no error is generated -
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* number will be rounded to inf or 0, if necessary
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*/
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asm ("pushl %eax"); /* grab a stack slot */
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asm ("fstcw (%esp)"); /* get 387 control word */
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asm ("movl (%esp),%eax"); /* save old value */
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asm ("orl $0x3f,%eax"); /* mask all exceptions */
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asm ("pushl %eax");
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asm ("fldcw (%esp)"); /* load new value into 387 */
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asm ("movl 8(%ebp),%eax");
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asm ("fldt (%eax)"); /* push extended number on 387 stack */
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asm ("fwait");
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asm ("movl 12(%ebp),%eax");
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asm ("fstpl (%eax)"); /* pop double */
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asm ("fwait");
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asm ("popl %eax"); /* flush modified control word */
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asm ("fnclex"); /* clear exceptions */
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asm ("fldcw (%esp)"); /* restore original control word */
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asm ("popl %eax"); /* flush saved copy */
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}
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double_to_i387 (from, to)
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char *from;
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char *to;
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{
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/* push double mode on 387 stack, then pop in extended mode
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* no errors are possible because every 64-bit pattern
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* can be converted to an extended
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*/
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asm ("movl 8(%ebp),%eax");
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asm ("fldl (%eax)");
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asm ("fwait");
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asm ("movl 12(%ebp),%eax");
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asm ("fstpt (%eax)");
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asm ("fwait");
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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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void
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print_387_control_word (control)
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unsigned int control;
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{
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printf ("control 0x%04x: ", control);
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printf ("compute to ");
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switch ((control >> 8) & 3)
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{
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case 0: printf ("24 bits; "); break;
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case 1: printf ("(bad); "); break;
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case 2: printf ("53 bits; "); break;
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case 3: printf ("64 bits; "); break;
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}
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printf ("round ");
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switch ((control >> 10) & 3)
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{
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case 0: printf ("NEAREST; "); break;
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case 1: printf ("DOWN; "); break;
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case 2: printf ("UP; "); break;
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case 3: printf ("CHOP; "); break;
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}
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if (control & 0x3f)
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{
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printf ("mask:");
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if (control & 0x0001) printf (" INVALID");
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if (control & 0x0002) printf (" DENORM");
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if (control & 0x0004) printf (" DIVZ");
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if (control & 0x0008) printf (" OVERF");
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if (control & 0x0010) printf (" UNDERF");
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if (control & 0x0020) printf (" LOS");
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printf (";");
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}
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printf ("\n");
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if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n",
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control & 0xe080);
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}
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void
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print_387_status_word (status)
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unsigned int status;
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{
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printf ("status 0x%04x: ", status);
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if (status & 0xff)
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{
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printf ("exceptions:");
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if (status & 0x0001) printf (" INVALID");
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if (status & 0x0002) printf (" DENORM");
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if (status & 0x0004) printf (" DIVZ");
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if (status & 0x0008) printf (" OVERF");
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if (status & 0x0010) printf (" UNDERF");
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if (status & 0x0020) printf (" LOS");
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if (status & 0x0040) printf (" FPSTACK");
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printf ("; ");
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}
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printf ("flags: %d%d%d%d; ",
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(status & 0x4000) != 0,
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(status & 0x0400) != 0,
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(status & 0x0200) != 0,
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(status & 0x0100) != 0);
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printf ("top %d\n", (status >> 11) & 7);
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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 ((unsigned int)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 ((unsigned int)ep->status);
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}
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print_387_control_word ((unsigned int)ep->control);
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printf ("last exception: ");
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printf ("opcode 0x%x; ", ep->opcode);
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printf ("pc 0x%x:0x%x; ", ep->code_seg, ep->eip);
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printf ("operand 0x%x:0x%x\n", ep->operand_seg, ep->operand);
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top = (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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int st_regno;
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double val;
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/* The physical regno `fpreg' is only relevant as an index into the
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* tag word. Logical `%st' numbers are required for indexing `p->regs.
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*/
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st_regno = (fpreg + 8 - top) & 0x7;
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printf ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " ");
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switch ((ep->tag >> (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[st_regno][i]);
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i387_to_double (ep->regs[st_regno], (char *)&val);
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printf (" %g\n", val);
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}
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}
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i386_float_info ()
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{
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struct user u; /* just for address computations */
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int i;
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/* fpstate defined in <sys/user.h> */
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struct fpstate *fpstatep;
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char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
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unsigned int uaddr;
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char fpvalid;
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unsigned int rounded_addr;
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unsigned int rounded_size;
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/*extern int corechan;*/
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int skip;
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extern int inferior_pid;
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uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
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if (inferior_pid)
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{
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int *ip;
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rounded_addr = uaddr & -sizeof (int);
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rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
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sizeof (int) - 1) / sizeof (int);
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skip = uaddr - rounded_addr;
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ip = (int *)buf;
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for (i = 0; i < rounded_size; i++)
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{
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*ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
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rounded_addr += sizeof (int);
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}
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}
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else
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{
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printf("float info: can't do a core file (yet)\n");
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return;
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#if 0
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if (lseek (corechan, uaddr, 0) < 0)
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perror_with_name ("seek on core file");
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if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
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perror_with_name ("read from core file");
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skip = 0;
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#endif
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}
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print_387_status (0, (struct env387 *)buf);
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}
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#endif
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