| 1 | /* Motorola m68k native support for Linux |
| 2 | Copyright (C) 1996,1998 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 | |
| 27 | #ifdef USG |
| 28 | #include <sys/types.h> |
| 29 | #endif |
| 30 | |
| 31 | #include <sys/param.h> |
| 32 | #include <sys/dir.h> |
| 33 | #include <signal.h> |
| 34 | #include <sys/user.h> |
| 35 | #include <sys/ioctl.h> |
| 36 | #include <fcntl.h> |
| 37 | #include <sys/procfs.h> |
| 38 | |
| 39 | #include <sys/file.h> |
| 40 | #include "gdb_stat.h" |
| 41 | |
| 42 | #include "floatformat.h" |
| 43 | |
| 44 | #include "target.h" |
| 45 | \f |
| 46 | |
| 47 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ |
| 48 | static const int regmap[] = |
| 49 | { |
| 50 | PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, |
| 51 | PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, |
| 52 | PT_SR, PT_PC, |
| 53 | /* PT_FP0, ..., PT_FP7 */ |
| 54 | 21, 24, 27, 30, 33, 36, 39, 42, |
| 55 | /* PT_FPCR, PT_FPSR, PT_FPIAR */ |
| 56 | 45, 46, 47 |
| 57 | }; |
| 58 | |
| 59 | /* BLOCKEND is the value of u.u_ar0, and points to the place where GS |
| 60 | is stored. */ |
| 61 | |
| 62 | int |
| 63 | m68k_linux_register_u_addr (blockend, regnum) |
| 64 | int blockend; |
| 65 | int regnum; |
| 66 | { |
| 67 | return (blockend + 4 * regmap[regnum]); |
| 68 | } |
| 69 | |
| 70 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
| 71 | unpack the register contents and supply them as gdb's idea of the current |
| 72 | register values. */ |
| 73 | |
| 74 | |
| 75 | /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions |
| 76 | for supply_gregset and supply_fpregset. The definitions |
| 77 | in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise, |
| 78 | the definitions in m68klinux-nat.c will be used. This is a |
| 79 | bit of a hack. The supply_* routines do not belong in |
| 80 | *_tdep.c files. But, there are several lynx ports that currently |
| 81 | depend on these definitions. */ |
| 82 | |
| 83 | #ifndef USE_PROC_FS |
| 84 | |
| 85 | void |
| 86 | supply_gregset (gregsetp) |
| 87 | gregset_t *gregsetp; |
| 88 | { |
| 89 | int regi; |
| 90 | |
| 91 | for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++) |
| 92 | supply_register (regi, (char *) (*gregsetp + regmap[regi])); |
| 93 | supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR)); |
| 94 | supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC)); |
| 95 | } |
| 96 | |
| 97 | /* Given a pointer to a floating point register set in /proc format |
| 98 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 99 | idea of the current floating point register values. */ |
| 100 | |
| 101 | void |
| 102 | supply_fpregset (fpregsetp) |
| 103 | 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 | \f |
| 116 | |
| 117 | int |
| 118 | kernel_u_size () |
| 119 | { |
| 120 | return (sizeof (struct user)); |
| 121 | } |
| 122 | \f |
| 123 | /* Return non-zero if PC points into the signal trampoline. */ |
| 124 | |
| 125 | int |
| 126 | in_sigtramp (pc) |
| 127 | CORE_ADDR pc; |
| 128 | { |
| 129 | CORE_ADDR sp; |
| 130 | char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT]; |
| 131 | int insn; |
| 132 | |
| 133 | sp = read_register (SP_REGNUM); |
| 134 | if (pc - 2 < sp) |
| 135 | return 0; |
| 136 | |
| 137 | if (read_memory_nobpt (pc, buf, sizeof (buf))) |
| 138 | return 0; |
| 139 | insn = extract_unsigned_integer (buf, sizeof (buf)); |
| 140 | if (insn == 0xdefc /* addaw #,sp */ |
| 141 | || insn == 0x7077 /* moveq #119,d0 */ |
| 142 | || insn == 0x4e40 /* trap #0 */ |
| 143 | || insn == 0x203c /* movel #,d0 */ ) |
| 144 | return 1; |
| 145 | |
| 146 | if (read_memory_nobpt (pc - 2, buf, sizeof (buf))) |
| 147 | return 0; |
| 148 | insn = extract_unsigned_integer (buf, sizeof (buf)); |
| 149 | if (insn == 0xdefc /* addaw #,sp */ |
| 150 | || insn == 0x7077 /* moveq #119,d0 */ |
| 151 | || insn == 0x4e40 /* trap #0 */ |
| 152 | || insn == 0x203c /* movel #,d0 */ ) |
| 153 | return 1; |
| 154 | |
| 155 | return 0; |
| 156 | } |