/* Intel 386 stuff. Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include "defs.h" #include "frame.h" #include "inferior.h" #include "language.h" #include "gdbcore.h" #ifdef USG #include #endif #include #include #include #include #include #include #include #include #include #include "ieee-float.h" #include "target.h" extern struct ext_format ext_format_i387; /* this table must line up with REGISTER_NAMES in m-i386.h */ /* symbols like 'EAX' come from */ static int regmap[] = { EAX, ECX, EDX, EBX, UESP, EBP, ESI, EDI, EIP, EFL, CS, SS, DS, ES, FS, GS, }; /* blockend is the value of u.u_ar0, and points to the * place where GS is stored */ int i386_register_u_addr (blockend, regnum) int blockend; int regnum; { #if 0 /* this will be needed if fp registers are reinstated */ /* for now, you can look at them with 'info float' * sys5 wont let you change them with ptrace anyway */ if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) { int ubase, fpstate; struct user u; ubase = blockend + 4 * (SS + 1) - KSTKSZ; fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u); return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); } else #endif return (blockend + 4 * regmap[regnum]); } #if 0 /* mauro@olympus 1991.10.20 -- compiling the following code causes undefined symbols at link time, specifically: corechan, have_inferior_p */ struct env387 { unsigned short control; unsigned short r0; unsigned short status; unsigned short r1; unsigned short tag; unsigned short r2; unsigned long eip; unsigned short code_seg; unsigned short opcode; unsigned long operand; unsigned short operand_seg; unsigned short r3; unsigned char regs[8][10]; }; static print_387_status (status, ep) unsigned short status; struct env387 *ep; { int i; int bothstatus; int top; int fpreg; unsigned char *p; bothstatus = ((status != 0) && (ep->status != 0)); if (status != 0) { if (bothstatus) printf ("u: "); print_387_status_word (status); } if (ep->status != 0) { if (bothstatus) printf ("e: "); print_387_status_word (ep->status); } print_387_control_word (ep->control); printf ("last exception: "); printf ("opcode %s; ", local_hex_string(ep->opcode)); printf ("pc %s:", local_hex_string(ep->code_seg)); printf ("%s; ", local_hex_string(ep->eip)); printf ("operand %s", local_hex_string(ep->operand_seg)); printf (":%s\n", local_hex_string(ep->operand)); top = (ep->status >> 11) & 7; printf ("regno tag msb lsb value\n"); for (fpreg = 7; fpreg >= 0; fpreg--) { double val; printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); switch ((ep->tag >> (fpreg * 2)) & 3) { case 0: printf ("valid "); break; case 1: printf ("zero "); break; case 2: printf ("trap "); break; case 3: printf ("empty "); break; } for (i = 9; i >= 0; i--) printf ("%02x", ep->regs[fpreg][i]); ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg], &val); printf (" %g\n", val); } if (ep->r0) printf ("warning: reserved0 is %s\n", local_hex_string(ep->r0)); if (ep->r1) printf ("warning: reserved1 is %s\n", local_hex_string(ep->r1)); if (ep->r2) printf ("warning: reserved2 is %s\n", local_hex_string(ep->r2)); if (ep->r3) printf ("warning: reserved3 is %s\n", local_hex_string(ep->r3)); } #ifndef U_FPSTATE #define U_FPSTATE(u) u.u_fpstate #endif i386_float_info () { struct user u; /* just for address computations */ int i; /* fpstate defined in */ struct fpstate *fpstatep; char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; unsigned int uaddr; char fpvalid = 0; unsigned int rounded_addr; unsigned int rounded_size; extern int corechan; int skip; uaddr = (char *)&u.u_fpvalid - (char *)&u; if (target_has_execution) { unsigned int data; unsigned int mask; rounded_addr = uaddr & -sizeof (int); data = ptrace (3, inferior_pid, rounded_addr, 0); mask = 0xff << ((uaddr - rounded_addr) * 8); fpvalid = ((data & mask) != 0); } #if 0 else { if (lseek (corechan, uaddr, 0) < 0) perror ("seek on core file"); if (myread (corechan, &fpvalid, 1) < 0) perror ("read on core file"); } #endif /* no core support yet */ if (fpvalid == 0) { printf ("no floating point status saved\n"); return; } uaddr = (char *)&U_FPSTATE(u) - (char *)&u; if (target_has_execution) { int *ip; rounded_addr = uaddr & -sizeof (int); rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) + sizeof (int) - 1) / sizeof (int); skip = uaddr - rounded_addr; ip = (int *)buf; for (i = 0; i < rounded_size; i++) { *ip++ = ptrace (3, inferior_pid, rounded_addr, 0); rounded_addr += sizeof (int); } } #if 0 else { if (lseek (corechan, uaddr, 0) < 0) perror_with_name ("seek on core file"); if (myread (corechan, buf, sizeof (struct fpstate)) < 0) perror_with_name ("read from core file"); skip = 0; } #endif /* 0 */ fpstatep = (struct fpstate *)(buf + skip); print_387_status (fpstatep->status, (struct env387 *)fpstatep->state); } #endif /* mauro@olympus 1991.10.20 */