| 1 | /* Extract registers from a "standard" core file, for GDB. |
| 2 | Copyright (C) 1988-1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* core.c is supposed to be the more machine-independent aspects of this; |
| 21 | this file is more machine-specific. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/param.h> |
| 26 | #include "gdbcore.h" |
| 27 | |
| 28 | /* These are needed on various systems to expand REGISTER_U_ADDR. */ |
| 29 | #ifndef USG |
| 30 | #include <sys/dir.h> |
| 31 | #include <sys/file.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/user.h> |
| 34 | #ifndef NO_PTRACE_H |
| 35 | # ifdef PTRACE_IN_WRONG_PLACE |
| 36 | # include <ptrace.h> |
| 37 | # else /* !PTRACE_IN_WRONG_PLACE */ |
| 38 | # include <sys/ptrace.h> |
| 39 | # endif /* !PTRACE_IN_WRONG_PLACE */ |
| 40 | #endif /* NO_PTRACE_H */ |
| 41 | #endif |
| 42 | |
| 43 | /* Extract the register values out of the core file and store |
| 44 | them where `read_register' will find them. |
| 45 | |
| 46 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 47 | CORE_REG_SIZE is the size of that area. |
| 48 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 49 | on machines where they are discontiguous). |
| 50 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 51 | core_reg_sect. This is used with old-fashioned core files to |
| 52 | locate the registers in a large upage-plus-stack ".reg" section. |
| 53 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 54 | */ |
| 55 | |
| 56 | void |
| 57 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 58 | char *core_reg_sect; |
| 59 | unsigned core_reg_size; |
| 60 | int which; |
| 61 | unsigned reg_addr; |
| 62 | { |
| 63 | register int regno; |
| 64 | register unsigned int addr; |
| 65 | int bad_reg = -1; |
| 66 | register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ |
| 67 | |
| 68 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, |
| 69 | so we can use it as an offset into core_reg_sect. When we're done, |
| 70 | "register 0" will be at core_reg_sect+reg_ptr, and we can use |
| 71 | register_addr to offset to the other registers. If this is a modern |
| 72 | core file without a upage, reg_ptr will be zero and this is all a big |
| 73 | NOP. */ |
| 74 | if (reg_ptr > core_reg_size) |
| 75 | reg_ptr -= KERNEL_U_ADDR; |
| 76 | |
| 77 | for (regno = 0; regno < NUM_REGS; regno++) |
| 78 | { |
| 79 | addr = register_addr (regno, reg_ptr); |
| 80 | if (addr >= core_reg_size) { |
| 81 | if (bad_reg < 0) |
| 82 | bad_reg = regno; |
| 83 | } else { |
| 84 | supply_register (regno, core_reg_sect + addr); |
| 85 | } |
| 86 | } |
| 87 | if (bad_reg >= 0) |
| 88 | { |
| 89 | error ("Register %s not found in core file.", reg_names[bad_reg]); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | |
| 94 | #ifdef REGISTER_U_ADDR |
| 95 | |
| 96 | /* Return the address in the core dump or inferior of register REGNO. |
| 97 | BLOCKEND is the address of the end of the user structure. */ |
| 98 | |
| 99 | unsigned int |
| 100 | register_addr (regno, blockend) |
| 101 | int regno; |
| 102 | int blockend; |
| 103 | { |
| 104 | int addr; |
| 105 | |
| 106 | if (regno < 0 || regno >= NUM_REGS) |
| 107 | error ("Invalid register number %d.", regno); |
| 108 | |
| 109 | REGISTER_U_ADDR (addr, blockend, regno); |
| 110 | |
| 111 | return addr; |
| 112 | } |
| 113 | |
| 114 | #endif /* REGISTER_U_ADDR */ |