| 1 | /* Native-dependent code for VAX UNIXen (including older BSD's). |
| 2 | |
| 3 | Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "inferior.h" |
| 23 | |
| 24 | #include "gdb_assert.h" |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/dir.h> |
| 27 | #include <sys/user.h> |
| 28 | |
| 29 | #ifdef HAVE_SYS_PTRACE_H |
| 30 | #include <sys/ptrace.h> |
| 31 | #endif |
| 32 | |
| 33 | #ifndef PT_READ_U |
| 34 | #define PT_READ_U 3 |
| 35 | #endif |
| 36 | |
| 37 | #ifdef SYS_REG_H |
| 38 | /* UNIX 32V and derivatives (including 3BSD). */ |
| 39 | #include <sys/reg.h> |
| 40 | #else |
| 41 | /* 4.2BSD and derivatives. */ |
| 42 | #include <machine/reg.h> |
| 43 | #endif |
| 44 | |
| 45 | #include "vax-tdep.h" |
| 46 | #include "inf-ptrace.h" |
| 47 | |
| 48 | /* Address of the user structure. This is the value for 32V; 3BSD |
| 49 | uses a different value, but hey, who's still using those systems? */ |
| 50 | static CORE_ADDR vax_kernel_u_addr = 0x80020000; |
| 51 | |
| 52 | /* Location of the user's stored registers; usage is `u.u_ar0[XX]'. |
| 53 | For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */ |
| 54 | static int vax_register_index[] = |
| 55 | { |
| 56 | R0, R1, R2, R3, R4, R5, |
| 57 | R6, R7, R8, R9, R10, R11, |
| 58 | AP, FP, SP, PC, PS |
| 59 | }; |
| 60 | |
| 61 | static CORE_ADDR |
| 62 | vax_register_u_addr (CORE_ADDR u_ar0, int regnum) |
| 63 | { |
| 64 | gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index)); |
| 65 | |
| 66 | /* Type is `int *u_ar0'. See <sys/user.h>. */ |
| 67 | return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4; |
| 68 | } |
| 69 | |
| 70 | static CORE_ADDR |
| 71 | vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p) |
| 72 | { |
| 73 | size_t u_ar0_offset = offsetof (struct user, u_ar0); |
| 74 | CORE_ADDR u_ar0; |
| 75 | int pid; |
| 76 | |
| 77 | errno = 0; |
| 78 | pid = PIDGET (inferior_ptid); |
| 79 | u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0); |
| 80 | if (errno) |
| 81 | perror_with_name (_("Unable to determine location of registers")); |
| 82 | |
| 83 | return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr; |
| 84 | } |
| 85 | \f |
| 86 | |
| 87 | #include <nlist.h> |
| 88 | |
| 89 | #ifndef _PATH_UNIX |
| 90 | #define _PATH_UNIX "/vmunix" |
| 91 | #endif |
| 92 | |
| 93 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 94 | void _initialize_vax_nat (void); |
| 95 | |
| 96 | void |
| 97 | _initialize_vax_nat (void) |
| 98 | { |
| 99 | struct nlist names[2]; |
| 100 | |
| 101 | names[0].n_name = "_u"; |
| 102 | names[1].n_name = NULL; |
| 103 | if (nlist (_PATH_UNIX, names) == 0) |
| 104 | vax_kernel_u_addr = names[0].n_value; |
| 105 | |
| 106 | add_target (inf_ptrace_trad_target (vax_register_u_offset)); |
| 107 | } |