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-rw-r--r--gdb/i386v-nat.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/gdb/i386v-nat.c b/gdb/i386v-nat.c
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--- a/gdb/i386v-nat.c
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-/* Intel 386 native support for SYSV systems (pre-SVR4).
- Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 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 HAVE_PTRACE_H
-# include <ptrace.h>
-#else
-# ifdef HAVE_SYS_PTRACE_H
-# include <sys/ptrace.h>
-# endif
-#endif
-
-#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>
-
-
-/* FIXME: The following used to be just "#include <sys/debugreg.h>", but
- * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
- * <sys/debugreg.h> will result in an error. With luck, these losers
- * will get their act together and we can trash this hack in the near future.
- * --jsm 1998-10-21
- */
-
-#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
-# ifdef HAVE_ASM_DEBUGREG_H
-# include <asm/debugreg.h>
-# else
-# include <sys/debugreg.h>
-# endif
-#endif
-
-#include <sys/file.h>
-#include "gdb_stat.h"
-
-#ifdef HAVE_SYS_REG_H
-#include <sys/reg.h>
-#endif
-
-#include "floatformat.h"
-
-#include "target.h"
-
-
-/* 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;
-{
- struct user u;
- int fpstate;
- int ubase;
-
- ubase = blockend;
- /* FIXME: Should have better way to test floating point range */
- if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7))
- {
-#ifdef KSTKSZ /* SCO, and others? */
- ubase += 4 * (SS + 1) - KSTKSZ;
- fpstate = ubase + ((char *)&u.u_fps.u_fpstate - (char *)&u);
- return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
-#else
- fpstate = ubase + ((char *)&u.i387.st_space - (char *)&u);
- return (fpstate + 10 * (regnum - FP0_REGNUM));
-#endif
- }
- else
- {
- return (ubase + 4 * regmap[regnum]);
- }
-
-}
-
-int
-kernel_u_size ()
-{
- return (sizeof (struct user));
-}
-
-#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
-
-#if !defined (offsetof)
-#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
-#endif
-
-/* Record the value of the debug control register. */
-static int debug_control_mirror;
-
-/* Record which address associates with which register. */
-static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
-
-static int
-i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
- int));
-
-static int
-i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
- int));
-
-/* Insert a watchpoint. */
-
-int
-i386_insert_watchpoint (pid, addr, len, rw)
- int pid;
- CORE_ADDR addr;
- int len;
- int rw;
-{
- return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
-}
-
-static int
-i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
- int pid;
- CORE_ADDR waddr;
- CORE_ADDR addr;
- int len;
- int rw;
-{
- int i;
- int read_write_bits, len_bits;
- int free_debug_register;
- int register_number;
-
- /* Look for a free debug register. */
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
- {
- if (address_lookup[i - DR_FIRSTADDR] == 0)
- break;
- }
-
- /* No more debug registers! */
- if (i > DR_LASTADDR)
- return -1;
-
- read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
-
- if (len == 1)
- len_bits = DR_LEN_1;
- else if (len == 2)
- {
- if (addr % 2)
- return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
- len_bits = DR_LEN_2;
- }
-
- else if (len == 4)
- {
- if (addr % 4)
- return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
- len_bits = DR_LEN_4;
- }
- else
- return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
-
- free_debug_register = i;
- register_number = free_debug_register - DR_FIRSTADDR;
- debug_control_mirror |=
- ((read_write_bits | len_bits)
- << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
- debug_control_mirror |=
- (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
- debug_control_mirror |= DR_LOCAL_SLOWDOWN;
- debug_control_mirror &= ~DR_CONTROL_RESERVED;
-
- ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
- debug_control_mirror);
- ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
- addr);
-
- /* Record where we came from. */
- address_lookup[register_number] = addr;
- return 0;
-}
-
-static int
-i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
- int pid;
- CORE_ADDR waddr;
- CORE_ADDR addr;
- int len;
- int rw;
-{
- int align;
- int size;
- int rv;
-
- static int size_try_array[16] = {
- 1, 1, 1, 1, /* trying size one */
- 2, 1, 2, 1, /* trying size two */
- 2, 1, 2, 1, /* trying size three */
- 4, 1, 2, 1 /* trying size four */
- };
-
- rv = 0;
- while (len > 0)
- {
- align = addr % 4;
- /* Four is the maximum length for 386. */
- size = (len > 4) ? 3 : len - 1;
- size = size_try_array[size * 4 + align];
-
- rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
- if (rv)
- {
- i386_remove_watchpoint (pid, waddr, size);
- return rv;
- }
- addr += size;
- len -= size;
- }
- return rv;
-}
-
-/* Remove a watchpoint. */
-
-int
-i386_remove_watchpoint (pid, addr, len)
- int pid;
- CORE_ADDR addr;
- int len;
-{
- int i;
- int register_number;
-
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
- {
- register_number = i - DR_FIRSTADDR;
- if (address_lookup[register_number] == addr)
- {
- debug_control_mirror &=
- ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
- address_lookup[register_number] = 0;
- }
- }
- ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
- debug_control_mirror);
- ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
-
- return 0;
-}
-
-/* Check if stopped by a watchpoint. */
-
-CORE_ADDR
-i386_stopped_by_watchpoint (pid)
- int pid;
-{
- int i;
- int status;
-
- status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
- ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
-
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
- {
- if (status & (1 << (i - DR_FIRSTADDR)))
- return address_lookup[i - DR_FIRSTADDR];
- }
-
- return 0;
-}
-
-#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
-
-#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_unfiltered ("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 */
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