binutils-gdb/gdb/i386b-nat.c

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/* Native-dependent code for BSD Unix running on i386's, for GDB.
Copyright 1988, 1989, 1991, 1992, 1994, 1996 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
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.
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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.
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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 <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include "inferior.h"
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#include "gdbcore.h" /* for registers_fetched() */
void
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fetch_inferior_registers (int regno)
{
struct reg inferior_registers;
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ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
registers_fetched ();
}
void
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store_inferior_registers (int regno)
{
struct reg inferior_registers;
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memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
}
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struct md_core
{
struct reg intreg;
struct fpreg freg;
};
void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
CORE_ADDR ignore)
{
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struct md_core *core_reg = (struct md_core *) core_reg_sect;
/* integer registers */
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memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
sizeof (struct reg));
/* floating point registers */
/* XXX */
}
#else
#include <machine/reg.h>
/* this table must line up with REGISTER_NAMES in tm-i386.h */
/* symbols like 'tEAX' come from <machine/reg.h> */
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static int tregmap[] =
{
tEAX, tECX, tEDX, tEBX,
tESP, tEBP, tESI, tEDI,
tEIP, tEFLAGS, tCS, tSS
};
#ifdef sEAX
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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. */
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static int sregmap[] =
{
tEAX, tECX, tEDX, tEBX,
tESP, tEBP, tESI, tEDI,
tEIP, tEFLAGS, tCS, tSS
};
#endif /* No sEAX */
/* blockend is the value of u.u_ar0, and points to the
place where ES is stored. */
int
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i386_register_u_addr (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"
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#include "language.h" /* for local_hex_string */
#include "floatformat.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <a.out.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
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#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */
#include <sys/user.h>
#undef curpcb
#include <sys/file.h>
#include "gdb_stat.h"
#include <sys/ptrace.h>
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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
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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
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print_387_status (unsigned short status, struct env387 *ep)
{
int i;
int bothstatus;
int top;
int fpreg;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
{
if (bothstatus)
printf_unfiltered ("u: ");
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print_387_status_word ((unsigned int) status);
}
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if (ep->status != 0)
{
if (bothstatus)
printf_unfiltered ("e: ");
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print_387_status_word ((unsigned int) ep->status);
}
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print_387_control_word ((unsigned int) ep->control);
printf_unfiltered ("last exception: ");
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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;
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printf_unfiltered ("regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
{
double val;
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printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
switch ((ep->tag >> (fpreg * 2)) & 3)
{
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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[fpreg][i]);
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floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
&val);
printf_unfiltered (" %g\n", val);
}
}
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i386_float_info (void)
{
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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;
unsigned int rounded_addr;
unsigned int rounded_size;
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/*extern int corechan; */
int skip;
extern int inferior_pid;
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uaddr = (char *) &U_FPSTATE (u) - (char *) &u;
if (inferior_pid)
{
int *ip;
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rounded_addr = uaddr & -sizeof (int);
rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
sizeof (int) - 1) / sizeof (int);
skip = uaddr - rounded_addr;
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ip = (int *) buf;
for (i = 0; i < rounded_size; i++)
{
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*ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t) rounded_addr, 0);
rounded_addr += sizeof (int);
}
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}
else
{
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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");
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if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
perror_with_name ("read from core file");
skip = 0;
#endif
}
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print_387_status (0, (struct env387 *) buf);
}
int
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kernel_u_size (void)
{
return (sizeof (struct user));
}
#endif