mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 02:47:05 +00:00
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).
|
||
Copyright (C) 1988, 1989, 1991, 1992, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#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>
|
||
|
||
#ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT
|
||
#include <sys/debugreg.h>
|
||
#endif
|
||
|
||
#include <sys/file.h>
|
||
#include <sys/stat.h>
|
||
|
||
#ifndef NO_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;
|
||
{
|
||
#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)
|
||
{
|
||
int ubase, fpstate;
|
||
struct user u;
|
||
ubase = blockend + 4 * (SS + 1) - KSTKSZ;
|
||
fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
|
||
return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
|
||
}
|
||
else
|
||
#endif
|
||
return (blockend + 4 * regmap[regnum]);
|
||
|
||
}
|
||
|
||
#ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT
|
||
|
||
#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_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
|
||
int));
|
||
|
||
static int
|
||
i386_insert_aligned_watchpoint PARAMS ((pid, addr, len, rw));
|
||
|
||
/* 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 : 0) | ((rw & 2) ? DR_RW_WRITE : 0);
|
||
|
||
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_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_CAN_USE_HARDWARE_WATCHPOINT */
|
||
|
||
#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 */
|