/* Native-dependent code for BSD Unix running on i386's, for GDB. Copyright 1988, 1989, 1991, 1992, 1994, 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #ifdef FETCH_INFERIOR_REGISTERS #include #include #include #include #include "inferior.h" void fetch_inferior_registers(regno) int regno; { struct reg inferior_registers; ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0); memcpy (®isters[REGISTER_BYTE (0)], &inferior_registers, 4*NUM_REGS); registers_fetched (); } void store_inferior_registers(regno) int regno; { struct reg inferior_registers; memcpy (&inferior_registers, ®isters[REGISTER_BYTE (0)], 4*NUM_REGS); ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0); } struct md_core { struct reg intreg; struct fpreg freg; }; void fetch_core_registers (core_reg_sect, core_reg_size, which, ignore) char *core_reg_sect; unsigned core_reg_size; int which; CORE_ADDR ignore; { struct md_core *core_reg = (struct md_core *)core_reg_sect; /* integer registers */ memcpy(®isters[REGISTER_BYTE (0)], &core_reg->intreg, sizeof(struct reg)); /* floating point registers */ /* XXX */ } #else #include /* Some systems don't provide all the registers on a trap. Use SS as a default if so. */ #ifndef tDS #define tDS tSS #endif #ifndef tES #define tES tSS #endif #ifndef tFS #define tFS tSS #endif #ifndef tGS #define tGS tSS #endif /* These tables map between the registers on a trap frame, and the register order used by the rest of GDB. */ /* this table must line up with REGISTER_NAMES in tm-i386.h */ /* symbols like 'tEAX' come from */ static int tregmap[] = { tEAX, tECX, tEDX, tEBX, tESP, tEBP, tESI, tEDI, tEIP, tEFLAGS, tCS, tSS, tDS, tES, tFS, tGS }; #ifdef sEAX static int sregmap[] = { sEAX, sECX, sEDX, sEBX, sESP, sEBP, sESI, sEDI, sEIP, sEFLAGS, sCS, sSS }; #else /* No sEAX */ /* FreeBSD has decided to collapse the s* and t* symbols. So if the s* ones aren't around, use the t* ones for sregmap too. */ static int sregmap[] = { tEAX, tECX, tEDX, tEBX, tESP, tEBP, tESI, tEDI, tEIP, tEFLAGS, tCS, tSS, tDS, tES, tFS, tGS }; #endif /* No sEAX */ /* blockend is the value of u.u_ar0, and points to the place where ES is stored. */ int i386_register_u_addr (blockend, regnum) int blockend; int regnum; { /* The following condition is a kludge to get at the proper register map depending upon the state of pcb_flag. The proper condition would be if (u.u_pcb.pcb_flag & FM_TRAP) but that would require a ptrace call here and wouldn't work for corefiles. */ if (blockend < 0x1fcc) return (blockend + 4 * tregmap[regnum]); else return (blockend + 4 * sregmap[regnum]); } #endif /* !FETCH_INFERIOR_REGISTERS */ #ifdef FLOAT_INFO #include "expression.h" #include "language.h" /* for local_hex_string */ #include "floatformat.h" #include #include #include #include #include #include #include #include #define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */ #include #undef curpcb #include #include "gdb_stat.h" #include extern void print_387_control_word (); /* i387-tdep.h */ extern void print_387_status_word (); #define fpstate save87 #define U_FPSTATE(u) u.u_pcb.pcb_savefpu static void i387_to_double (from, to) char *from; char *to; { long *lp; /* push extended mode on 387 stack, then pop in double mode * * first, set exception masks so no error is generated - * number will be rounded to inf or 0, if necessary */ asm ("pushl %eax"); /* grab a stack slot */ asm ("fstcw (%esp)"); /* get 387 control word */ asm ("movl (%esp),%eax"); /* save old value */ asm ("orl $0x3f,%eax"); /* mask all exceptions */ asm ("pushl %eax"); asm ("fldcw (%esp)"); /* load new value into 387 */ asm ("movl 8(%ebp),%eax"); asm ("fldt (%eax)"); /* push extended number on 387 stack */ asm ("fwait"); asm ("movl 12(%ebp),%eax"); asm ("fstpl (%eax)"); /* pop double */ asm ("fwait"); asm ("popl %eax"); /* flush modified control word */ asm ("fnclex"); /* clear exceptions */ asm ("fldcw (%esp)"); /* restore original control word */ asm ("popl %eax"); /* flush saved copy */ } 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 void print_387_status (status, ep) unsigned short status; struct env387 *ep; { int i; int bothstatus; int top; int fpreg; bothstatus = ((status != 0) && (ep->status != 0)); if (status != 0) { if (bothstatus) printf_unfiltered ("u: "); print_387_status_word ((unsigned int)status); } if (ep->status != 0) { if (bothstatus) printf_unfiltered ("e: "); print_387_status_word ((unsigned int)ep->status); } print_387_control_word ((unsigned int)ep->control); printf_unfiltered ("last instruction: "); printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode)); printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg)); printf_unfiltered ("%s; ", local_hex_string(ep->eip)); printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg)); printf_unfiltered (":%s\n", local_hex_string(ep->operand)); top = (ep->status >> 11) & 7; printf_unfiltered (" regno tag msb lsb value\n"); for (fpreg = 7; fpreg >= 0; fpreg--) { int st_regno; double val; /* The physical regno `fpreg' is only relevant as an index into the * tag word. Logical `%st' numbers are required for indexing ep->regs. */ st_regno = (fpreg + 8 - top) & 7; printf_unfiltered ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " "); switch ((ep->tag >> (fpreg * 2)) & 3) { case 0: printf_unfiltered ("valid "); break; case 1: printf_unfiltered ("zero "); break; case 2: printf_unfiltered ("trap "); break; case 3: printf_unfiltered ("empty "); break; } for (i = 9; i >= 0; i--) printf_unfiltered ("%02x", ep->regs[st_regno][i]); i387_to_double((char *) ep->regs[st_regno], (char *) &val); printf_unfiltered (" %g\n", val); } } void 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; unsigned int rounded_addr; unsigned int rounded_size; /*extern int corechan;*/ int skip; extern int inferior_pid; uaddr = (char *)&U_FPSTATE(u) - (char *)&u; if (inferior_pid) { 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 (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0); rounded_addr += sizeof (int); } } else { printf("float info: can't do a core file (yet)\n"); return; #if 0 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 } #ifdef __FreeBSD__ fpstatep = (struct fpstate *)(buf + skip); print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep); #else print_387_status (0, (struct env387 *)buf); #endif } #endif /* FLOAT_INFO */ int kernel_u_size () { return (sizeof (struct user)); } #ifdef SETUP_ARBITRARY_FRAME #include "frame.h" struct frame_info * setup_arbitrary_frame (argc, argv) int argc; CORE_ADDR *argv; { if (argc != 2) error ("i386 frame specifications require two arguments: sp and pc"); return create_new_frame (argv[0], argv[1]); } #endif /* SETUP_ARBITRARY_FRAME */