| 1 | /* Extract registers from a "standard" core file, for GDB. |
| 2 | Copyright (C) 1988-1998 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | /* Typically used on systems that have a.out format executables. |
| 21 | corefile.c is supposed to contain the more machine-independent |
| 22 | aspects of reading registers from core files, while this file is |
| 23 | more machine specific. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | |
| 27 | #ifdef HAVE_PTRACE_H |
| 28 | # include <ptrace.h> |
| 29 | #else |
| 30 | # ifdef HAVE_SYS_PTRACE_H |
| 31 | # include <sys/ptrace.h> |
| 32 | # endif |
| 33 | #endif |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/param.h> |
| 37 | #include "gdbcore.h" |
| 38 | #include "value.h" /* For supply_register. */ |
| 39 | #include "inferior.h" /* For ARCH_NUM_REGS. */ |
| 40 | |
| 41 | /* These are needed on various systems to expand REGISTER_U_ADDR. */ |
| 42 | #ifndef USG |
| 43 | #include <sys/dir.h> |
| 44 | #include <sys/file.h> |
| 45 | #include "gdb_stat.h" |
| 46 | #include <sys/user.h> |
| 47 | #endif |
| 48 | |
| 49 | #ifndef CORE_REGISTER_ADDR |
| 50 | #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr) |
| 51 | #endif /* CORE_REGISTER_ADDR */ |
| 52 | |
| 53 | #ifdef NEED_SYS_CORE_H |
| 54 | #include <sys/core.h> |
| 55 | #endif |
| 56 | |
| 57 | static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); |
| 58 | |
| 59 | void _initialize_core_aout PARAMS ((void)); |
| 60 | |
| 61 | /* Extract the register values out of the core file and store |
| 62 | them where `read_register' will find them. |
| 63 | |
| 64 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 65 | CORE_REG_SIZE is the size of that area. |
| 66 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 67 | on machines where they are discontiguous). |
| 68 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 69 | core_reg_sect. This is used with old-fashioned core files to |
| 70 | locate the registers in a large upage-plus-stack ".reg" section. |
| 71 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 72 | */ |
| 73 | |
| 74 | static void |
| 75 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 76 | char *core_reg_sect; |
| 77 | unsigned core_reg_size; |
| 78 | int which; |
| 79 | CORE_ADDR reg_addr; |
| 80 | { |
| 81 | int regno; |
| 82 | CORE_ADDR addr; |
| 83 | int bad_reg = -1; |
| 84 | CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
| 85 | int numregs = ARCH_NUM_REGS; |
| 86 | |
| 87 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, |
| 88 | so we can use it as an offset into core_reg_sect. When we're done, |
| 89 | "register 0" will be at core_reg_sect+reg_ptr, and we can use |
| 90 | CORE_REGISTER_ADDR to offset to the other registers. If this is a modern |
| 91 | core file without a upage, reg_ptr will be zero and this is all a big |
| 92 | NOP. */ |
| 93 | if (reg_ptr > core_reg_size) |
| 94 | reg_ptr -= KERNEL_U_ADDR; |
| 95 | |
| 96 | for (regno = 0; regno < numregs; regno++) |
| 97 | { |
| 98 | addr = CORE_REGISTER_ADDR (regno, reg_ptr); |
| 99 | if (addr >= core_reg_size |
| 100 | && bad_reg < 0) |
| 101 | bad_reg = regno; |
| 102 | else |
| 103 | supply_register (regno, core_reg_sect + addr); |
| 104 | } |
| 105 | |
| 106 | if (bad_reg >= 0) |
| 107 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | #ifdef REGISTER_U_ADDR |
| 112 | |
| 113 | /* Return the address in the core dump or inferior of register REGNO. |
| 114 | BLOCKEND is the address of the end of the user structure. */ |
| 115 | |
| 116 | CORE_ADDR |
| 117 | register_addr (regno, blockend) |
| 118 | int regno; |
| 119 | CORE_ADDR blockend; |
| 120 | { |
| 121 | CORE_ADDR addr; |
| 122 | |
| 123 | if (regno < 0 || regno >= ARCH_NUM_REGS) |
| 124 | error ("Invalid register number %d.", regno); |
| 125 | |
| 126 | REGISTER_U_ADDR (addr, blockend, regno); |
| 127 | |
| 128 | return addr; |
| 129 | } |
| 130 | |
| 131 | #endif /* REGISTER_U_ADDR */ |
| 132 | |
| 133 | \f |
| 134 | /* Register that we are able to handle aout (trad-core) file formats. */ |
| 135 | |
| 136 | static struct core_fns aout_core_fns = |
| 137 | { |
| 138 | bfd_target_unknown_flavour, |
| 139 | fetch_core_registers, |
| 140 | NULL |
| 141 | }; |
| 142 | |
| 143 | void |
| 144 | _initialize_core_aout () |
| 145 | { |
| 146 | add_core_fns (&aout_core_fns); |
| 147 | } |