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/* Host-dependent code for GDB, for NYU Ultra3 running Sym1 OS.
Copyright (C) 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
Contributed by David Wood (wood@nyu.edu) at New York University.
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. */
#define DEBUG
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "symtab.h"
#include "value.h"
#include <sys/types.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include "gdbcore.h"
#include <sys/file.h>
#include <sys/stat.h>
/* Assumes support for AMD's Binary Compatibility Standard
for ptrace(). If you define ULTRA3, the ultra3 extensions to
ptrace() are used allowing the reading of more than one register
at a time.
This file assumes KERNEL_DEBUGGING is turned off. This means
that if the user/gdb tries to read gr64-gr95 or any of the
protected special registers we silently return -1 (see the
CANNOT_STORE/FETCH_REGISTER macros). */
#define ULTRA3
#if !defined (offsetof)
# define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif
extern int errno;
struct ptrace_user pt_struct;
/*
* Takes a register number as defined in tm.h via REGISTER_NAMES, and maps
* it to an offset in a struct ptrace_user defined by AMD's BCS.
* That is, it defines the mapping between gdb register numbers and items in
* a struct ptrace_user.
* A register protection scheme is set up here. If a register not
* available to the user is specified in 'regno', then an address that
* will cause ptrace() to fail is returned.
*/
unsigned int
register_addr (regno,blockend)
unsigned int regno;
char *blockend;
{
if ((regno >= LR0_REGNUM) && (regno < LR0_REGNUM + 128)) {
return(offsetof(struct ptrace_user,pt_lr[regno-LR0_REGNUM]));
} else if ((regno >= GR96_REGNUM) && (regno < GR96_REGNUM + 32)) {
return(offsetof(struct ptrace_user,pt_gr[regno-GR96_REGNUM]));
} else {
switch (regno) {
case GR1_REGNUM: return(offsetof(struct ptrace_user,pt_gr1));
case CPS_REGNUM: return(offsetof(struct ptrace_user,pt_psr));
case NPC_REGNUM: return(offsetof(struct ptrace_user,pt_pc0));
case PC_REGNUM: return(offsetof(struct ptrace_user,pt_pc1));
case PC2_REGNUM: return(offsetof(struct ptrace_user,pt_pc2));
case IPC_REGNUM: return(offsetof(struct ptrace_user,pt_ipc));
case IPA_REGNUM: return(offsetof(struct ptrace_user,pt_ipa));
case IPB_REGNUM: return(offsetof(struct ptrace_user,pt_ipb));
case Q_REGNUM: return(offsetof(struct ptrace_user,pt_q));
case BP_REGNUM: return(offsetof(struct ptrace_user,pt_bp));
case FC_REGNUM: return(offsetof(struct ptrace_user,pt_fc));
default:
fprintf_filtered(stderr,"register_addr():Bad register %s (%d)\n",
reg_names[regno],regno);
return(0xffffffff); /* Should make ptrace() fail */
}
}
}
/* Assorted operating system circumventions */
#ifdef SYM1
/* FIXME: Kludge this for now. It really should be system call. */
int
getpagesize()
{ return(8192); }
/* FIXME: Fake out the fcntl() call, which we don't have. */
fcntl(fd, cmd, arg)
int fd, cmd, arg;
{
switch (cmd) {
case F_GETFL: return(O_RDONLY); break;
default:
printf("Ultra3's fcntl() failing, cmd = %d.\n",cmd);
return(-1);
}
}
/*
* 4.2 Signal support, requires linking with libjobs.
*/
static int _SigMask;
#define sigbit(s) (1L << ((s)-1))
init_SigMask()
{
/* Taken from the sym1 kernel in machdep.c:startup() */
_SigMask = sigbit (SIGTSTP) | sigbit (SIGTTOU) | sigbit (SIGTTIN) |
sigbit (SIGCHLD) | sigbit (SIGTINT);
}
sigmask(signo)
int signo;
{
return (1 << (signo-1));
}
sigsetmask(sigmask)
unsigned int sigmask;
{
int i, mask = 1;
int lastmask = _SigMask;
for (i=0 ; i<NSIG ; i++) {
if (sigmask & mask) {
if (!(_SigMask & mask)) {
sighold(i+1);
_SigMask |= mask;
}
} else if (_SigMask & mask) {
sigrelse(i+1);
_SigMask &= ~mask;
}
mask <<= 1;
}
return (lastmask);
}
sigblock(sigmask)
unsigned int sigmask;
{
int i, mask = 1;
int lastmask = _SigMask;
for (i=0 ; i<NSIG ; i++) {
if ((sigmask & mask) && !(_SigMask & mask)) {
sighold(i+1);
_SigMask |= mask;
}
mask <<= 1;
}
return (lastmask);
}
#endif /* SYM1 */
/* Initialization code for this module. */
_initialize_ultra3 ()
{
#ifdef SYM1
init_SigMask();
#endif
}
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