1 /* Extract registers from a "standard" core file, for GDB. 2 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 3 1999, 2000, 2001 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 /* Typically used on systems that have a.out format executables. 23 corefile.c is supposed to contain the more machine-independent 24 aspects of reading registers from core files, while this file is 25 more machine specific. */ 26 27 #include "defs.h" 28 29 #ifdef HAVE_PTRACE_H 30 #include <ptrace.h> 31 #else 32 #ifdef HAVE_SYS_PTRACE_H 33 #include <sys/ptrace.h> 34 #endif 35 #endif 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include "gdbcore.h" 40 #include "value.h" 41 #include "regcache.h" 42 43 /* These are needed on various systems to expand REGISTER_U_ADDR. */ 44 #include "gdb_dirent.h" 45 #include <sys/file.h> 46 #include "gdb_stat.h" 47 #include <sys/user.h> 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 (char *, unsigned, int, CORE_ADDR); 58 59 void _initialize_core_aout (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 (char *core_reg_sect, unsigned core_reg_size, int which, 76 CORE_ADDR reg_addr) 77 { 78 int regno; 79 CORE_ADDR addr; 80 int bad_reg = -1; 81 CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ 82 int numregs = NUM_REGS; 83 84 /* If u.u_ar0 was an absolute address in the core file, relativize it now, 85 so we can use it as an offset into core_reg_sect. When we're done, 86 "register 0" will be at core_reg_sect+reg_ptr, and we can use 87 CORE_REGISTER_ADDR to offset to the other registers. If this is a modern 88 core file without a upage, reg_ptr will be zero and this is all a big 89 NOP. */ 90 if (reg_ptr > core_reg_size) 91 reg_ptr -= KERNEL_U_ADDR; 92 93 for (regno = 0; regno < numregs; regno++) 94 { 95 addr = CORE_REGISTER_ADDR (regno, reg_ptr); 96 if (addr >= core_reg_size 97 && bad_reg < 0) 98 bad_reg = regno; 99 else 100 regcache_raw_supply (current_regcache, regno, core_reg_sect + addr); 101 } 102 103 if (bad_reg >= 0) 104 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); 105 } 106 107 108 #ifdef REGISTER_U_ADDR 109 110 /* Return the address in the core dump or inferior of register REGNO. 111 BLOCKEND is the address of the end of the user structure. */ 112 113 CORE_ADDR 114 register_addr (int regno, CORE_ADDR blockend) 115 { 116 CORE_ADDR addr; 117 118 if (regno < 0 || regno >= NUM_REGS) 119 error ("Invalid register number %d.", regno); 120 121 REGISTER_U_ADDR (addr, blockend, regno); 122 123 return addr; 124 } 125 126 #endif /* REGISTER_U_ADDR */ 127 128 129 /* Register that we are able to handle aout (trad-core) file formats. */ 130 131 static struct core_fns aout_core_fns = 132 { 133 bfd_target_unknown_flavour, /* core_flavour */ 134 default_check_format, /* check_format */ 135 default_core_sniffer, /* core_sniffer */ 136 fetch_core_registers, /* core_read_registers */ 137 NULL /* next */ 138 }; 139 140 void 141 _initialize_core_aout (void) 142 { 143 deprecated_add_core_fns (&aout_core_fns); 144 } 145