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Diffstat (limited to 'contrib/gdb/gdb/i386v-nat.c')
-rw-r--r-- | contrib/gdb/gdb/i386v-nat.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/i386v-nat.c b/contrib/gdb/gdb/i386v-nat.c new file mode 100644 index 0000000..678eabc --- /dev/null +++ b/contrib/gdb/gdb/i386v-nat.c @@ -0,0 +1,277 @@ +/* Intel 386 native support for System V systems (pre-SVR4). + + Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, + 1999, 2000, 2002 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> + +#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS +#include <sys/debugreg.h> +#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" + +#include "i386-tdep.h" + + +/* 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, + EIP, EFL, CS, SS, + DS, ES, FS, GS, +}; + +/* Support for the user struct. */ + +/* 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) +{ + struct user u; + CORE_ADDR fpstate; + + if (i386_fp_regnum_p (regnum)) + { +#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 + fpstate = blockend + ((char *) &u.i387.st_space - (char *) &u); + return (fpstate + 10 * (regnum - FP0_REGNUM)); +#endif + } + + return (blockend + 4 * regmap[regnum]); +} + +/* Return the size of the user struct. */ + +int +kernel_u_size (void) +{ + 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 (int, CORE_ADDR, CORE_ADDR, int, + int); + +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) +{ + 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 (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) + { + 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; + } + 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++) + { + 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 (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 */ |