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" /* For supply_register. */ 41#include "regcache.h" 42 43/* These are needed on various systems to expand REGISTER_U_ADDR. */ 44#ifndef USG 45#include "gdb_dirent.h" 46#include <sys/file.h> 47#include "gdb_stat.h" 48#include <sys/user.h> 49#endif 50 51#ifndef CORE_REGISTER_ADDR 52#define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr) 53#endif /* CORE_REGISTER_ADDR */ 54 55#ifdef NEED_SYS_CORE_H 56#include <sys/core.h> 57#endif 58 59static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); 60 61void _initialize_core_aout (void); 62 63/* Extract the register values out of the core file and store 64 them where `read_register' will find them. 65 66 CORE_REG_SECT points to the register values themselves, read into memory. 67 CORE_REG_SIZE is the size of that area. 68 WHICH says which set of registers we are handling (0 = int, 2 = float 69 on machines where they are discontiguous). 70 REG_ADDR is the offset from u.u_ar0 to the register values relative to 71 core_reg_sect. This is used with old-fashioned core files to 72 locate the registers in a large upage-plus-stack ".reg" section. 73 Original upage address X is at location core_reg_sect+x+reg_addr. 74 */ 75 76static void 77fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, 78 CORE_ADDR reg_addr) 79{ 80 int regno; 81 CORE_ADDR addr; 82 int bad_reg = -1; 83 CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ 84 int numregs = NUM_REGS; 85 86 /* If u.u_ar0 was an absolute address in the core file, relativize it now, 87 so we can use it as an offset into core_reg_sect. When we're done, 88 "register 0" will be at core_reg_sect+reg_ptr, and we can use 89 CORE_REGISTER_ADDR to offset to the other registers. If this is a modern 90 core file without a upage, reg_ptr will be zero and this is all a big 91 NOP. */ 92 if (reg_ptr > core_reg_size) 93 reg_ptr -= KERNEL_U_ADDR; 94 95 for (regno = 0; regno < numregs; regno++) 96 { 97 addr = CORE_REGISTER_ADDR (regno, reg_ptr); 98 if (addr >= core_reg_size 99 && bad_reg < 0) 100 bad_reg = regno; 101 else 102 supply_register (regno, core_reg_sect + addr); 103 } 104 105 if (bad_reg >= 0) 106 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); 107} 108 109 110#ifdef REGISTER_U_ADDR 111 112/* Return the address in the core dump or inferior of register REGNO. 113 BLOCKEND is the address of the end of the user structure. */ 114 115CORE_ADDR 116register_addr (int regno, CORE_ADDR blockend) 117{ 118 CORE_ADDR addr; 119 120 if (regno < 0 || regno >= NUM_REGS) 121 error ("Invalid register number %d.", regno); 122 123 REGISTER_U_ADDR (addr, blockend, regno); 124 125 return addr; 126} 127 128#endif /* REGISTER_U_ADDR */ 129 130 131/* Register that we are able to handle aout (trad-core) file formats. */ 132 133static struct core_fns aout_core_fns = 134{ 135 bfd_target_unknown_flavour, /* core_flavour */ 136 default_check_format, /* check_format */ 137 default_core_sniffer, /* core_sniffer */ 138 fetch_core_registers, /* core_read_registers */ 139 NULL /* next */ 140}; 141 142void 143_initialize_core_aout (void) 144{ 145 add_core_fns (&aout_core_fns); 146} 147