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Diffstat (limited to 'gdb/i386v-nat.c')
| -rw-r--r-- | gdb/i386v-nat.c | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/gdb/i386v-nat.c b/gdb/i386v-nat.c new file mode 100644 index 00000000000..5618687a689 --- /dev/null +++ b/gdb/i386v-nat.c @@ -0,0 +1,392 @@ +/* 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 */ |