| 1 | /* Acorn Risc Machine host machine support. |
| 2 | Copyright (C) 1988, 1989, 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 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "arm-opcode.h" |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <sys/param.h> |
| 27 | #include <sys/dir.h> |
| 28 | #include <signal.h> |
| 29 | #include <sys/ioctl.h> |
| 30 | #include <sys/ptrace.h> |
| 31 | #include <machine/reg.h> |
| 32 | |
| 33 | #define N_TXTADDR(hdr) 0x8000 |
| 34 | #define N_DATADDR(hdr) (hdr.a_text + 0x8000) |
| 35 | |
| 36 | #include "gdbcore.h" |
| 37 | |
| 38 | #include <sys/user.h> /* After a.out.h */ |
| 39 | #include <sys/file.h> |
| 40 | #include <sys/stat.h> |
| 41 | |
| 42 | #include <errno.h> |
| 43 | |
| 44 | void |
| 45 | fetch_inferior_registers (regno) |
| 46 | int regno; |
| 47 | { |
| 48 | register int regno; |
| 49 | register unsigned int regaddr; |
| 50 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 51 | register int i; |
| 52 | |
| 53 | struct user u; |
| 54 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; |
| 55 | offset = ptrace (PT_READ_U, inferior_pid, offset, 0) - KERNEL_U_ADDR; |
| 56 | |
| 57 | registers_fetched (); |
| 58 | |
| 59 | for (regno = 0; regno < 16; regno++) |
| 60 | { |
| 61 | regaddr = offset + regno * 4; |
| 62 | *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, regaddr, 0); |
| 63 | if (regno == PC_REGNUM) |
| 64 | *(int *)&buf[0] = GET_PC_PART(*(int *)&buf[0]); |
| 65 | supply_register (regno, buf); |
| 66 | } |
| 67 | *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, offset + PC*4); |
| 68 | supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */ |
| 69 | |
| 70 | /* read the floating point registers */ |
| 71 | offset = (char *) &u.u_fp_regs - (char *)&u; |
| 72 | *(int *)buf = ptrace (PT_READ_U, inferior_pid, offset, 0); |
| 73 | supply_register (FPS_REGNUM, buf); |
| 74 | for (regno = 16; regno < 24; regno++) { |
| 75 | regaddr = offset + 4 + 12 * (regno - 16); |
| 76 | for (i = 0; i < 12; i += sizeof(int)) |
| 77 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, regaddr + i, 0); |
| 78 | supply_register (regno, buf); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /* Store our register values back into the inferior. |
| 83 | If REGNO is -1, do this for all registers. |
| 84 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 85 | |
| 86 | store_inferior_registers (regno) |
| 87 | int regno; |
| 88 | { |
| 89 | register unsigned int regaddr; |
| 90 | char buf[80]; |
| 91 | |
| 92 | struct user u; |
| 93 | unsigned long value; |
| 94 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; |
| 95 | offset = ptrace (PT_READ_U, inferior_pid, offset, 0) - KERNEL_U_ADDR; |
| 96 | |
| 97 | if (regno >= 0) { |
| 98 | if (regno >= 16) return; |
| 99 | regaddr = offset + 4 * regno; |
| 100 | errno = 0; |
| 101 | value = read_register(regno); |
| 102 | if (regno == PC_REGNUM) |
| 103 | value = SET_PC_PART(read_register (PS_REGNUM), value); |
| 104 | ptrace (PT_WRITE_U, inferior_pid, regaddr, value); |
| 105 | if (errno != 0) |
| 106 | { |
| 107 | sprintf (buf, "writing register number %d", regno); |
| 108 | perror_with_name (buf); |
| 109 | } |
| 110 | } |
| 111 | else for (regno = 0; regno < 15; regno++) |
| 112 | { |
| 113 | regaddr = offset + regno * 4; |
| 114 | errno = 0; |
| 115 | value = read_register(regno); |
| 116 | if (regno == PC_REGNUM) |
| 117 | value = SET_PC_PART(read_register (PS_REGNUM), value); |
| 118 | ptrace (6, inferior_pid, regaddr, value); |
| 119 | if (errno != 0) |
| 120 | { |
| 121 | sprintf (buf, "writing all regs, number %d", regno); |
| 122 | perror_with_name (buf); |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | \f |
| 127 | /* Work with core dump and executable files, for GDB. |
| 128 | This code would be in core.c if it weren't machine-dependent. */ |
| 129 | |
| 130 | /* Structure to describe the chain of shared libraries used |
| 131 | by the execfile. |
| 132 | e.g. prog shares Xt which shares X11 which shares c. */ |
| 133 | |
| 134 | struct shared_library { |
| 135 | struct exec_header header; |
| 136 | char name[SHLIBLEN]; |
| 137 | CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| 138 | long data_offset; /* offset of data section in file */ |
| 139 | int chan; /* file descriptor for the file */ |
| 140 | struct shared_library *shares; /* library this one shares */ |
| 141 | }; |
| 142 | static struct shared_library *shlib = 0; |
| 143 | |
| 144 | /* Hook for `exec_file_command' command to call. */ |
| 145 | |
| 146 | extern void (*exec_file_display_hook) (); |
| 147 | |
| 148 | static CORE_ADDR unshared_text_start; |
| 149 | |
| 150 | /* extended header from exec file (for shared library info) */ |
| 151 | |
| 152 | static struct exec_header exec_header; |
| 153 | \f |
| 154 | void |
| 155 | core_file_command (filename, from_tty) |
| 156 | char *filename; |
| 157 | int from_tty; |
| 158 | { |
| 159 | int val; |
| 160 | extern char registers[]; |
| 161 | |
| 162 | /* Discard all vestiges of any previous core file |
| 163 | and mark data and stack spaces as empty. */ |
| 164 | |
| 165 | if (corefile) |
| 166 | free (corefile); |
| 167 | corefile = 0; |
| 168 | |
| 169 | if (corechan >= 0) |
| 170 | close (corechan); |
| 171 | corechan = -1; |
| 172 | |
| 173 | data_start = 0; |
| 174 | data_end = 0; |
| 175 | stack_start = STACK_END_ADDR; |
| 176 | stack_end = STACK_END_ADDR; |
| 177 | |
| 178 | /* Now, if a new core file was specified, open it and digest it. */ |
| 179 | |
| 180 | if (filename) |
| 181 | { |
| 182 | filename = tilde_expand (filename); |
| 183 | make_cleanup (free, filename); |
| 184 | |
| 185 | if (have_inferior_p ()) |
| 186 | error ("To look at a core file, you must kill the inferior with \"kill\"."); |
| 187 | corechan = open (filename, O_RDONLY, 0); |
| 188 | if (corechan < 0) |
| 189 | perror_with_name (filename); |
| 190 | /* 4.2-style (and perhaps also sysV-style) core dump file. */ |
| 191 | { |
| 192 | struct user u; |
| 193 | |
| 194 | unsigned int reg_offset, fp_reg_offset; |
| 195 | |
| 196 | val = myread (corechan, &u, sizeof u); |
| 197 | if (val < 0) |
| 198 | perror_with_name ("Not a core file: reading upage"); |
| 199 | if (val != sizeof u) |
| 200 | error ("Not a core file: could only read %d bytes", val); |
| 201 | |
| 202 | /* We are depending on exec_file_command having been called |
| 203 | previously to set exec_data_start. Since the executable |
| 204 | and the core file share the same text segment, the address |
| 205 | of the data segment will be the same in both. */ |
| 206 | data_start = exec_data_start; |
| 207 | |
| 208 | data_end = data_start + NBPG * u.u_dsize; |
| 209 | stack_start = stack_end - NBPG * u.u_ssize; |
| 210 | data_offset = NBPG * UPAGES; |
| 211 | stack_offset = NBPG * (UPAGES + u.u_dsize); |
| 212 | |
| 213 | /* Some machines put an absolute address in here and some put |
| 214 | the offset in the upage of the regs. */ |
| 215 | reg_offset = (int) u.u_ar0; |
| 216 | if (reg_offset > NBPG * UPAGES) |
| 217 | reg_offset -= KERNEL_U_ADDR; |
| 218 | fp_reg_offset = (char *) &u.u_fp_regs - (char *)&u; |
| 219 | |
| 220 | /* I don't know where to find this info. |
| 221 | So, for now, mark it as not available. */ |
| 222 | N_SET_MAGIC (core_aouthdr, 0); |
| 223 | |
| 224 | /* Read the register values out of the core file and store |
| 225 | them where `read_register' will find them. */ |
| 226 | |
| 227 | { |
| 228 | register int regno; |
| 229 | |
| 230 | for (regno = 0; regno < NUM_REGS; regno++) |
| 231 | { |
| 232 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 233 | |
| 234 | if (regno < 16) |
| 235 | val = lseek (corechan, reg_offset + 4 * regno, 0); |
| 236 | else if (regno < 24) |
| 237 | val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0); |
| 238 | else if (regno == 24) |
| 239 | val = lseek (corechan, fp_reg_offset, 0); |
| 240 | else if (regno == 25) |
| 241 | val = lseek (corechan, reg_offset + 4 * PC, 0); |
| 242 | if (val < 0 |
| 243 | || (val = myread (corechan, buf, sizeof buf)) < 0) |
| 244 | { |
| 245 | char * buffer = (char *) alloca (strlen (reg_names[regno]) |
| 246 | + 30); |
| 247 | strcpy (buffer, "Reading register "); |
| 248 | strcat (buffer, reg_names[regno]); |
| 249 | |
| 250 | perror_with_name (buffer); |
| 251 | } |
| 252 | |
| 253 | if (regno == PC_REGNUM) |
| 254 | *(int *)buf = GET_PC_PART(*(int *)buf); |
| 255 | supply_register (regno, buf); |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | if (filename[0] == '/') |
| 260 | corefile = savestring (filename, strlen (filename)); |
| 261 | else |
| 262 | { |
| 263 | corefile = concat (current_directory, "/", filename, NULL); |
| 264 | } |
| 265 | |
| 266 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), |
| 267 | read_pc ())); |
| 268 | select_frame (get_current_frame (), 0); |
| 269 | validate_files (); |
| 270 | } |
| 271 | else if (from_tty) |
| 272 | printf ("No core file now.\n"); |
| 273 | } |