-/* Intel 386 native support.
- Copyright (C) 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
+/* Intel 386 native support for System V systems (pre-SVR4).
-This file is part of GDB.
+ Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
+ 1999, 2000, 2002 Free Software Foundation, Inc.
-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 file is part of GDB.
-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.
+ 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.
-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. */
+ 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 <sys/ioctl.h>
#include <fcntl.h>
+#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
+#include <sys/debugreg.h>
+#endif
+
#include <sys/file.h>
-#include <sys/stat.h>
+#include "gdb_stat.h"
+#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
-#include "ieee-float.h"
+#endif
+
+#include "floatformat.h"
#include "target.h"
-extern struct ext_format ext_format_i387;
+#include "i386-tdep.h"
\f
-/* this table must line up with REGISTER_NAMES in tm-i386v.h */
-/* symbols like 'EAX' come from <sys/reg.h> */
-static int regmap[] =
+
+/* Mapping between the general-purpose registers in `struct user'
+ format and GDB's register array layout. */
+static int regmap[] =
{
EAX, ECX, EDX, EBX,
UESP, EBP, ESI, EDI,
DS, ES, FS, GS,
};
-/* blockend is the value of u.u_ar0, and points to the
- * place where GS is stored
- */
+/* Support for the user struct. */
-int
-i386_register_u_addr (blockend, regnum)
- int blockend;
- int regnum;
+/* Return the address of register REGNUM. BLOCKEND is the value of
+ u.u_ar0, and points to the place where GS is stored. */
+
+CORE_ADDR
+register_u_addr (CORE_ADDR 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)
+ struct user u;
+ CORE_ADDR fpstate;
+
+ if (i386_fp_regnum_p (regnum))
{
- int ubase, fpstate;
- struct user u;
- ubase = blockend + 4 * (SS + 1) - KSTKSZ;
- fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
+#ifdef KSTKSZ /* SCO, and others? */
+ blockend += 4 * (SS + 1) - KSTKSZ;
+ fpstate = blockend + ((char *) &u.u_fps.u_fpstate - (char *) &u);
return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
- }
- else
+#else
+ fpstate = blockend + ((char *) &u.i387.st_space - (char *) &u);
+ return (fpstate + 10 * (regnum - FP0_REGNUM));
#endif
- return (blockend + 4 * regmap[regnum]);
-
+ }
+
+ return (blockend + 4 * regmap[regnum]);
+}
+
+/* Return the size of the user struct. */
+
+int
+kernel_u_size (void)
+{
+ return (sizeof (struct user));
}
+\f
+#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];
-#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.
+static int i386_insert_aligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int,
+ int);
- A fix might be to move this code into the "info registers" command.
- rich@cygnus.com 15 Sept 92. */
-i386_float_info ()
+static int i386_insert_nonaligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int,
+ int);
+
+/* Insert a watchpoint. */
+
+int
+i386_insert_watchpoint (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 (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
{
- 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)
+ 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)
{
- 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 (addr % 2)
+ return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+ len_bits = DR_LEN_2;
+ }
+
+ else if (len == 4)
{
- if (lseek (corechan, uaddr, 0) < 0)
- perror ("seek on core file");
- if (myread (corechan, &fpvalid, 1) < 0)
- perror ("read on core file");
-
+ if (addr % 4)
+ return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+ len_bits = DR_LEN_4;
}
-#endif /* no core support yet */
-
- if (fpvalid == 0)
+ 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 (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+ int len, int rw)
+{
+ int align;
+ int size;
+ int rv;
+
+ static int size_try_array[4][4] =
+ {
+ { 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)
{
- printf ("no floating point status saved\n");
- return;
+ align = addr % 4;
+ /* Four is the maximum length for 386. */
+ size = size_try_array[len > 4 ? 3 : len - 1][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;
}
-
- uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
- if (target_has_execution)
+ return rv;
+}
+
+/* Remove a watchpoint. */
+
+int
+i386_remove_watchpoint (int pid, CORE_ADDR addr, int len)
+{
+ int i;
+ int register_number;
+
+ for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
{
- 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++)
+ register_number = i - DR_FIRSTADDR;
+ if (address_lookup[register_number] == addr)
{
- *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
- rounded_addr += sizeof (int);
+ debug_control_mirror &=
+ ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
+ address_lookup[register_number] = 0;
}
- }
-#if 0
- else
+ }
+ 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 (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 (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;
+ if (status & (1 << (i - DR_FIRSTADDR)))
+ return address_lookup[i - DR_FIRSTADDR];
}
- #endif /* 0 */
- fpstatep = (struct fpstate *)(buf + skip);
- print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
+ return 0;
}
-#endif /* never */
+#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
projects / deliverable / binutils-gdb.git / blobdiff