| 1 | /* Native-dependent code for Interix running on i386's, for GDB. |
| 2 | Copyright 2002 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 | #include "defs.h" |
| 21 | |
| 22 | #include <sys/procfs.h> |
| 23 | #include <inferior.h> |
| 24 | #include <fcntl.h> |
| 25 | |
| 26 | #include <i386-tdep.h> |
| 27 | #include "gdb_string.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "gregset.h" |
| 30 | #include "regcache.h" |
| 31 | |
| 32 | typedef unsigned long greg_t; |
| 33 | |
| 34 | /* This is a duplicate of the table in i386-linux-nat.c. */ |
| 35 | |
| 36 | static int regmap[] = { |
| 37 | EAX, ECX, EDX, EBX, |
| 38 | UESP, EBP, ESI, EDI, |
| 39 | EIP, EFL, CS, SS, |
| 40 | DS, ES, FS, GS, |
| 41 | }; |
| 42 | |
| 43 | /* Forward declarations. */ |
| 44 | extern void _initialize_core_interix (void); |
| 45 | extern initialize_file_ftype _initialize_core_interix; |
| 46 | |
| 47 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
| 48 | unpack the register contents and supply them as gdb's idea of the current |
| 49 | register values. */ |
| 50 | |
| 51 | void |
| 52 | supply_gregset (gregset_t *gregsetp) |
| 53 | { |
| 54 | int regi; |
| 55 | greg_t *regp = (greg_t *) & gregsetp->gregs; |
| 56 | |
| 57 | for (regi = 0; regi < I386_NUM_GREGS; regi++) |
| 58 | { |
| 59 | supply_register (regi, (char *) (regp + regmap[regi])); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | /* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all |
| 64 | of them. */ |
| 65 | |
| 66 | void |
| 67 | fill_gregset (gregset_t *gregsetp, int regno) |
| 68 | { |
| 69 | int regi; |
| 70 | greg_t *regp = (greg_t *) gregsetp->gregs; |
| 71 | |
| 72 | for (regi = 0; regi < I386_NUM_GREGS; regi++) |
| 73 | if (regno == -1 || regi == regno) |
| 74 | regcache_collect (regi, (void *) (regp + regmap[regi])); |
| 75 | } |
| 76 | |
| 77 | /* Fill GDB's register file with the floating-point register values in |
| 78 | *FPREGSETP. */ |
| 79 | |
| 80 | void |
| 81 | supply_fpregset (fpregset_t *fpregsetp) |
| 82 | { |
| 83 | i387_supply_fsave ((char *) fpregsetp); |
| 84 | } |
| 85 | |
| 86 | /* Given a pointer to a floating point register set in (fpregset_t *) |
| 87 | format, update all of the registers from gdb's idea of the current |
| 88 | floating point register set. */ |
| 89 | |
| 90 | void |
| 91 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
| 92 | { |
| 93 | i387_fill_fsave ((char *) fpregsetp, regno); |
| 94 | } |
| 95 | |
| 96 | /* Read the values of either the general register set (WHICH equals 0) |
| 97 | or the floating point register set (WHICH equals 2) from the core |
| 98 | file data (pointed to by CORE_REG_SECT), and update gdb's idea of |
| 99 | their current values. The CORE_REG_SIZE parameter is compared to |
| 100 | the size of the gregset or fpgregset structures (as appropriate) to |
| 101 | validate the size of the structure from the core file. The |
| 102 | REG_ADDR parameter is ignored. */ |
| 103 | |
| 104 | static void |
| 105 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 106 | CORE_ADDR reg_addr) |
| 107 | { |
| 108 | gdb_gregset_t gregset; |
| 109 | gdb_fpregset_t fpregset; |
| 110 | |
| 111 | if (which == 0) |
| 112 | { |
| 113 | if (core_reg_size != sizeof (gregset)) |
| 114 | { |
| 115 | warning ("wrong size gregset struct in core file"); |
| 116 | } |
| 117 | else |
| 118 | { |
| 119 | memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset)); |
| 120 | supply_gregset (&gregset); |
| 121 | } |
| 122 | } |
| 123 | else if (which == 2) |
| 124 | { |
| 125 | if (core_reg_size != sizeof (fpregset)) |
| 126 | { |
| 127 | warning ("wrong size fpregset struct in core file"); |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset)); |
| 132 | supply_fpregset (&fpregset); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | #include <setjmp.h> |
| 138 | |
| 139 | static struct core_fns interix_core_fns = |
| 140 | { |
| 141 | bfd_target_coff_flavour, /* core_flavour (more or less) */ |
| 142 | default_check_format, /* check_format */ |
| 143 | default_core_sniffer, /* core_sniffer */ |
| 144 | fetch_core_registers, /* core_read_registers */ |
| 145 | NULL /* next */ |
| 146 | }; |
| 147 | |
| 148 | void |
| 149 | _initialize_core_interix (void) |
| 150 | { |
| 151 | add_core_fns (&interix_core_fns); |
| 152 | } |
| 153 | |
| 154 | /* We don't have a /proc/pid/file or /proc/pid/exe to read a link from, |
| 155 | so read it from the same place ps gets the name. */ |
| 156 | |
| 157 | char * |
| 158 | child_pid_to_exec_file (int pid) |
| 159 | { |
| 160 | char *path; |
| 161 | char *buf; |
| 162 | int fd, c; |
| 163 | char *p; |
| 164 | |
| 165 | xasprintf (&path, "/proc/%d/stat", pid); |
| 166 | buf = xcalloc (MAXPATHLEN + 1, sizeof (char)); |
| 167 | make_cleanup (xfree, path); |
| 168 | make_cleanup (xfree, buf); |
| 169 | |
| 170 | fd = open (path, O_RDONLY); |
| 171 | |
| 172 | if (fd < 0) |
| 173 | return NULL; |
| 174 | |
| 175 | /* Skip over "Argv0\t". */ |
| 176 | lseek (fd, 6, SEEK_SET); |
| 177 | |
| 178 | c = read (fd, buf, MAXPATHLEN); |
| 179 | close (fd); |
| 180 | |
| 181 | if (c < 0) |
| 182 | return NULL; |
| 183 | |
| 184 | buf[c] = '\0'; /* Ensure null termination. */ |
| 185 | p = strchr (buf, '\n'); |
| 186 | if (p != NULL) |
| 187 | *p = '\0'; |
| 188 | |
| 189 | return buf; |
| 190 | } |