/* Intel 386 native support for SYSV systems (pre-SVR4). Copyright (C) 1988, 1989, 1991, 1992 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 "defs.h" #include "frame.h" #include "inferior.h" #include "language.h" #include "gdbcore.h" #ifdef USG #include <sys/types.h> #endif #include <sys/param.h> #include <sys/dir.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include <fcntl.h> #include <sys/file.h> #include <sys/stat.h> #ifndef NO_SYS_REG_H #include <sys/reg.h> #endif #include "ieee-float.h" #include "target.h" extern struct ext_format ext_format_i387; /* this table must line up with REGISTER_NAMES in tm-i386v.h */ /* symbols like 'EAX' come from <sys/reg.h> */ 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 /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called via a command xxx and eventually calls ptrace without ever having traversed the target vector. This would be terribly impolite behaviour for a sun4 hosted remote gdb. A fix might be to move this code into the "info registers" command. rich@cygnus.com 15 Sept 92. */ i386_float_info () { struct user u; /* just for address computations */ int i; /* fpstate defined in <sys/user.h> */ 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, (PTRACE_ARG3_TYPE) 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, (PTRACE_ARG3_TYPE) 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 /* never */