| 1 | /* Motorola m68k native support for Linux |
| 2 | Copyright 1996, 1998, 2000, 2001 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, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "frame.h" |
| 23 | #include "inferior.h" |
| 24 | #include "language.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "regcache.h" |
| 27 | |
| 28 | #ifdef USG |
| 29 | #include <sys/types.h> |
| 30 | #endif |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/dir.h> |
| 34 | #include <signal.h> |
| 35 | #include <sys/user.h> |
| 36 | #include <sys/ioctl.h> |
| 37 | #include <fcntl.h> |
| 38 | #include <sys/procfs.h> |
| 39 | |
| 40 | #include <sys/file.h> |
| 41 | #include "gdb_stat.h" |
| 42 | |
| 43 | #include "floatformat.h" |
| 44 | |
| 45 | #include "target.h" |
| 46 | \f |
| 47 | |
| 48 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ |
| 49 | static const int regmap[] = |
| 50 | { |
| 51 | PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, |
| 52 | PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, |
| 53 | PT_SR, PT_PC, |
| 54 | /* PT_FP0, ..., PT_FP7 */ |
| 55 | 21, 24, 27, 30, 33, 36, 39, 42, |
| 56 | /* PT_FPCR, PT_FPSR, PT_FPIAR */ |
| 57 | 45, 46, 47 |
| 58 | }; |
| 59 | |
| 60 | /* BLOCKEND is the value of u.u_ar0, and points to the place where GS |
| 61 | is stored. */ |
| 62 | |
| 63 | int |
| 64 | m68k_linux_register_u_addr (int blockend, int regnum) |
| 65 | { |
| 66 | return (blockend + 4 * regmap[regnum]); |
| 67 | } |
| 68 | |
| 69 | /* Given a pointer to a general register set in /proc format |
| 70 | (elf_gregset_t *), unpack the register contents and supply |
| 71 | them as gdb's idea of the current register values. */ |
| 72 | |
| 73 | |
| 74 | /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions |
| 75 | for supply_gregset and supply_fpregset. The definitions |
| 76 | in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise, |
| 77 | the definitions in m68klinux-nat.c will be used. This is a |
| 78 | bit of a hack. The supply_* routines do not belong in |
| 79 | *_tdep.c files. But, there are several lynx ports that currently |
| 80 | depend on these definitions. */ |
| 81 | |
| 82 | #ifndef USE_PROC_FS |
| 83 | |
| 84 | /* Prototypes for supply_gregset etc. */ |
| 85 | #include "gregset.h" |
| 86 | |
| 87 | void |
| 88 | supply_gregset (elf_gregset_t *gregsetp) |
| 89 | { |
| 90 | int regi; |
| 91 | |
| 92 | for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++) |
| 93 | supply_register (regi, (char *) (*gregsetp + regmap[regi])); |
| 94 | supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR)); |
| 95 | supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC)); |
| 96 | } |
| 97 | |
| 98 | /* Given a pointer to a floating point register set in /proc format |
| 99 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 100 | idea of the current floating point register values. */ |
| 101 | |
| 102 | void |
| 103 | supply_fpregset (elf_fpregset_t *fpregsetp) |
| 104 | { |
| 105 | int regi; |
| 106 | |
| 107 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
| 108 | supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]); |
| 109 | supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]); |
| 110 | supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]); |
| 111 | supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]); |
| 112 | } |
| 113 | |
| 114 | #endif |
| 115 | |
| 116 | \f |
| 117 | /* Interpreting register set info found in core files. */ |
| 118 | |
| 119 | /* Provide registers to GDB from a core file. |
| 120 | |
| 121 | (We can't use the generic version of this function in |
| 122 | core-regset.c, because we need to use elf_gregset_t instead of |
| 123 | gregset_t.) |
| 124 | |
| 125 | CORE_REG_SECT points to an array of bytes, which are the contents |
| 126 | of a `note' from a core file which BFD thinks might contain |
| 127 | register contents. CORE_REG_SIZE is its size. |
| 128 | |
| 129 | WHICH says which register set corelow suspects this is: |
| 130 | 0 --- the general-purpose register set, in elf_gregset_t format |
| 131 | 2 --- the floating-point register set, in elf_fpregset_t format |
| 132 | |
| 133 | REG_ADDR isn't used on Linux. */ |
| 134 | |
| 135 | static void |
| 136 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
| 137 | int which, CORE_ADDR reg_addr) |
| 138 | { |
| 139 | elf_gregset_t gregset; |
| 140 | elf_fpregset_t fpregset; |
| 141 | |
| 142 | switch (which) |
| 143 | { |
| 144 | case 0: |
| 145 | if (core_reg_size != sizeof (gregset)) |
| 146 | warning ("Wrong size gregset in core file."); |
| 147 | else |
| 148 | { |
| 149 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); |
| 150 | supply_gregset (&gregset); |
| 151 | } |
| 152 | break; |
| 153 | |
| 154 | case 2: |
| 155 | if (core_reg_size != sizeof (fpregset)) |
| 156 | warning ("Wrong size fpregset in core file."); |
| 157 | else |
| 158 | { |
| 159 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); |
| 160 | supply_fpregset (&fpregset); |
| 161 | } |
| 162 | break; |
| 163 | |
| 164 | default: |
| 165 | /* We've covered all the kinds of registers we know about here, |
| 166 | so this must be something we wouldn't know what to do with |
| 167 | anyway. Just ignore it. */ |
| 168 | break; |
| 169 | } |
| 170 | } |
| 171 | \f |
| 172 | |
| 173 | int |
| 174 | kernel_u_size (void) |
| 175 | { |
| 176 | return (sizeof (struct user)); |
| 177 | } |
| 178 | \f |
| 179 | /* Return non-zero if PC points into the signal trampoline. */ |
| 180 | |
| 181 | int |
| 182 | in_sigtramp (CORE_ADDR pc) |
| 183 | { |
| 184 | CORE_ADDR sp; |
| 185 | char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT]; |
| 186 | int insn; |
| 187 | |
| 188 | sp = read_register (SP_REGNUM); |
| 189 | if (pc - 2 < sp) |
| 190 | return 0; |
| 191 | |
| 192 | if (read_memory_nobpt (pc, buf, sizeof (buf))) |
| 193 | return 0; |
| 194 | insn = extract_unsigned_integer (buf, sizeof (buf)); |
| 195 | if (insn == 0xdefc /* addaw #,sp */ |
| 196 | || insn == 0x7077 /* moveq #119,d0 */ |
| 197 | || insn == 0x4e40 /* trap #0 */ |
| 198 | || insn == 0x203c /* movel #,d0 */ ) |
| 199 | return 1; |
| 200 | |
| 201 | if (read_memory_nobpt (pc - 2, buf, sizeof (buf))) |
| 202 | return 0; |
| 203 | insn = extract_unsigned_integer (buf, sizeof (buf)); |
| 204 | if (insn == 0xdefc /* addaw #,sp */ |
| 205 | || insn == 0x7077 /* moveq #119,d0 */ |
| 206 | || insn == 0x4e40 /* trap #0 */ |
| 207 | || insn == 0x203c /* movel #,d0 */ ) |
| 208 | return 1; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | \f |
| 214 | /* Register that we are able to handle Linux ELF core file formats. */ |
| 215 | |
| 216 | static struct core_fns linux_elf_core_fns = |
| 217 | { |
| 218 | bfd_target_elf_flavour, /* core_flavour */ |
| 219 | default_check_format, /* check_format */ |
| 220 | default_core_sniffer, /* core_sniffer */ |
| 221 | fetch_core_registers, /* core_read_registers */ |
| 222 | NULL /* next */ |
| 223 | }; |
| 224 | |
| 225 | void |
| 226 | _initialize_m68k_linux_nat () |
| 227 | { |
| 228 | add_core_fns (&linux_elf_core_fns); |
| 229 | } |