1 /* Extract registers from a "standard" core file, for GDB. 2 Copyright (C) 1988-1995 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 #include <sys/types.h> 27 #include <sys/param.h> 28 #include "gdbcore.h" 29 #include "value.h" /* For supply_register. */ 30 #include "inferior.h" /* For ARCH_NUM_REGS. */ 31 32 /* These are needed on various systems to expand REGISTER_U_ADDR. */ 33 #ifndef USG 34 #include <sys/dir.h> 35 #include <sys/file.h> 36 #include "gdb_stat.h" 37 #include <sys/user.h> 38 #ifndef NO_PTRACE_H 39 # ifdef PTRACE_IN_WRONG_PLACE 40 # include <ptrace.h> 41 # else /* !PTRACE_IN_WRONG_PLACE */ 42 # include <sys/ptrace.h> 43 # endif /* !PTRACE_IN_WRONG_PLACE */ 44 #endif /* NO_PTRACE_H */ 45 #endif 46 47 #ifndef CORE_REGISTER_ADDR 48 #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr) 49 #endif /* CORE_REGISTER_ADDR */ 50 51 #ifdef NEED_SYS_CORE_H 52 #include <sys/core.h> 53 #endif 54 55 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); 56 57 /* Extract the register values out of the core file and store 58 them where `read_register' will find them. 59 60 CORE_REG_SECT points to the register values themselves, read into memory. 61 CORE_REG_SIZE is the size of that area. 62 WHICH says which set of registers we are handling (0 = int, 2 = float 63 on machines where they are discontiguous). 64 REG_ADDR is the offset from u.u_ar0 to the register values relative to 65 core_reg_sect. This is used with old-fashioned core files to 66 locate the registers in a large upage-plus-stack ".reg" section. 67 Original upage address X is at location core_reg_sect+x+reg_addr. 68 */ 69 70 static void 71 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) 72 char *core_reg_sect; 73 unsigned core_reg_size; 74 int which; 75 CORE_ADDR reg_addr; 76 { 77 int regno; 78 CORE_ADDR addr; 79 int bad_reg = -1; 80 CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ 81 int numregs = ARCH_NUM_REGS; 82 83 /* If u.u_ar0 was an absolute address in the core file, relativize it now, 84 so we can use it as an offset into core_reg_sect. When we're done, 85 "register 0" will be at core_reg_sect+reg_ptr, and we can use 86 CORE_REGISTER_ADDR to offset to the other registers. If this is a modern 87 core file without a upage, reg_ptr will be zero and this is all a big 88 NOP. */ 89 if (reg_ptr > core_reg_size) 90 reg_ptr -= KERNEL_U_ADDR; 91 92 for (regno = 0; regno < numregs; regno++) 93 { 94 addr = CORE_REGISTER_ADDR (regno, reg_ptr); 95 if (addr >= core_reg_size 96 && bad_reg < 0) 97 bad_reg = regno; 98 else 99 supply_register (regno, core_reg_sect + addr); 100 } 101 102 if (bad_reg >= 0) 103 error ("Register %s not found in core file.", reg_names[bad_reg]); 104 } 105 106 107 #ifdef REGISTER_U_ADDR 108 109 /* Return the address in the core dump or inferior of register REGNO. 110 BLOCKEND is the address of the end of the user structure. */ 111 112 CORE_ADDR 113 register_addr (regno, blockend) 114 int regno; 115 CORE_ADDR blockend; 116 { 117 CORE_ADDR addr; 118 119 if (regno < 0 || regno >= ARCH_NUM_REGS) 120 error ("Invalid register number %d.", regno); 121 122 REGISTER_U_ADDR (addr, blockend, regno); 123 124 return addr; 125 } 126 127 #endif /* REGISTER_U_ADDR */ 128 129 130 /* Register that we are able to handle aout (trad-core) file formats. */ 131 132 static struct core_fns aout_core_fns = 133 { 134 bfd_target_unknown_flavour, 135 fetch_core_registers, 136 NULL 137 }; 138 139 void 140 _initialize_core_aout () 141 { 142 add_core_fns (&aout_core_fns); 143 } 144