04dd69e185
add additional argument specifying raw address to permit proper release of debug registers. (i386_insert_watchpoint, i386_insert_aligned_watchpoint): change all callers.
360 lines
8.6 KiB
C
360 lines
8.6 KiB
C
/* Intel 386 native support for SYSV systems (pre-SVR4).
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Copyright (C) 1988, 1989, 1991, 1992, 1994 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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT
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#include <sys/debugreg.h>
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#endif
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#include <sys/file.h>
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#include <sys/stat.h>
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#ifndef NO_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include "floatformat.h"
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#include "target.h"
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/* this table must line up with REGISTER_NAMES in tm-i386v.h */
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/* symbols like 'EAX' come from <sys/reg.h> */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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};
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/* blockend is the value of u.u_ar0, and points to the
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* place where GS is stored
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*/
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int
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i386_register_u_addr (blockend, regnum)
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int blockend;
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int regnum;
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{
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#if 0
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/* this will be needed if fp registers are reinstated */
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/* for now, you can look at them with 'info float'
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* sys5 wont let you change them with ptrace anyway
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*/
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if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
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{
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int ubase, fpstate;
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struct user u;
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ubase = blockend + 4 * (SS + 1) - KSTKSZ;
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fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
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return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
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}
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else
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#endif
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return (blockend + 4 * regmap[regnum]);
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}
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#ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT
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#if !defined (offsetof)
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#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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/* Record the value of the debug control register. */
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static int debug_control_mirror;
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/* Record which address associates with which register. */
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static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
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static int
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i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
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int));
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static int
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i386_insert_aligned_watchpoint PARAMS ((pid, addr, len, rw));
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/* Insert a watchpoint. */
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int
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i386_insert_watchpoint (pid, addr, len, rw)
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int pid;
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CORE_ADDR addr;
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int len;
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int rw;
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{
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return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
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}
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static int
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i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
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int pid;
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CORE_ADDR waddr;
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CORE_ADDR addr;
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int len;
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int rw;
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{
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int i;
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int read_write_bits, len_bits;
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int free_debug_register;
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int register_number;
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/* Look for a free debug register. */
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for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
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{
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if (address_lookup[i - DR_FIRSTADDR] == 0)
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break;
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}
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/* No more debug registers! */
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if (i > DR_LASTADDR)
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return -1;
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read_write_bits = ((rw & 1) ? DR_RW_READ : 0) | ((rw & 2) ? DR_RW_WRITE : 0);
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if (len == 1)
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len_bits = DR_LEN_1;
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else if (len == 2)
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{
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if (addr % 2)
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return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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len_bits = DR_LEN_2;
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}
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else if (len == 4)
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{
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if (addr % 4)
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return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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len_bits = DR_LEN_4;
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}
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else
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return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
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free_debug_register = i;
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register_number = free_debug_register - DR_FIRSTADDR;
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debug_control_mirror |=
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((read_write_bits | len_bits)
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<< (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
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debug_control_mirror |=
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(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
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debug_control_mirror |= DR_LOCAL_SLOWDOWN;
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debug_control_mirror &= ~DR_CONTROL_RESERVED;
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ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
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debug_control_mirror);
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ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
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addr);
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/* Record where we came from. */
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address_lookup[register_number] = addr;
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return 0;
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}
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static int
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i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
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int pid;
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CORE_ADDR waddr;
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CORE_ADDR addr;
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int len;
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int rw;
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{
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int align;
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int size;
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int rv;
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static int size_try_array[16] = {
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1, 1, 1, 1, /* trying size one */
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2, 1, 2, 1, /* trying size two */
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2, 1, 2, 1, /* trying size three */
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4, 1, 2, 1 /* trying size four */
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};
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rv = 0;
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while (len > 0)
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{
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align = addr % 4;
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/* Four is the maximum length for 386. */
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size = (len > 4) ? 3 : len - 1;
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size = size_try_array[size * 4 + align];
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rv = i386_insert_watchpoint (pid, waddr, addr, size, rw);
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if (rv)
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{
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i386_remove_watchpoint (pid, waddr, size);
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return rv;
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}
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addr += size;
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len -= size;
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}
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return rv;
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}
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/* Remove a watchpoint. */
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int
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i386_remove_watchpoint (pid, addr, len)
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int pid;
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CORE_ADDR addr;
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int len;
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{
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int i;
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int register_number;
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for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
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{
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register_number = i - DR_FIRSTADDR;
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if (address_lookup[register_number] == addr)
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{
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debug_control_mirror &=
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~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
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address_lookup[register_number] = 0;
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}
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}
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ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
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debug_control_mirror);
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ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
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return 0;
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}
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/* Check if stopped by a watchpoint. */
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CORE_ADDR
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i386_stopped_by_watchpoint (pid)
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int pid;
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{
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int i;
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int status;
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status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
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ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
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for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
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{
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if (status & (1 << (i - DR_FIRSTADDR)))
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return address_lookup[i - DR_FIRSTADDR];
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}
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return 0;
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}
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#endif /* TARGET_CAN_USE_HARDWARE_WATCHPOINT */
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#if 0
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/* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
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via a command xxx and eventually calls ptrace without ever having
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traversed the target vector. This would be terribly impolite
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behaviour for a sun4 hosted remote gdb.
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A fix might be to move this code into the "info registers" command.
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rich@cygnus.com 15 Sept 92. */
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i386_float_info ()
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{
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struct user u; /* just for address computations */
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int i;
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/* fpstate defined in <sys/user.h> */
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struct fpstate *fpstatep;
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char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
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unsigned int uaddr;
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char fpvalid = 0;
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unsigned int rounded_addr;
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unsigned int rounded_size;
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extern int corechan;
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int skip;
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uaddr = (char *)&u.u_fpvalid - (char *)&u;
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if (target_has_execution)
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{
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unsigned int data;
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unsigned int mask;
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rounded_addr = uaddr & -sizeof (int);
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data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
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mask = 0xff << ((uaddr - rounded_addr) * 8);
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fpvalid = ((data & mask) != 0);
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}
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#if 0
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else
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{
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if (lseek (corechan, uaddr, 0) < 0)
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perror ("seek on core file");
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if (myread (corechan, &fpvalid, 1) < 0)
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perror ("read on core file");
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}
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#endif /* no core support yet */
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if (fpvalid == 0)
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{
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printf_unfiltered ("no floating point status saved\n");
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return;
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}
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uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
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if (target_has_execution)
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{
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int *ip;
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rounded_addr = uaddr & -sizeof (int);
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rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
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sizeof (int) - 1) / sizeof (int);
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skip = uaddr - rounded_addr;
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ip = (int *)buf;
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for (i = 0; i < rounded_size; i++)
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{
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*ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
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rounded_addr += sizeof (int);
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}
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}
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#if 0
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else
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{
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if (lseek (corechan, uaddr, 0) < 0)
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perror_with_name ("seek on core file");
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if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
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perror_with_name ("read from core file");
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skip = 0;
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}
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#endif /* 0 */
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fpstatep = (struct fpstate *)(buf + skip);
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print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
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}
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#endif /* never */
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