| 1 | /* Common target dependent code for GDB on ARM systems. |
| 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, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "osabi.h" |
| 22 | |
| 23 | /* Register numbers of various important registers. Note that some of |
| 24 | these values are "real" register numbers, and correspond to the |
| 25 | general registers of the machine, and some are "phony" register |
| 26 | numbers which are too large to be actual register numbers as far as |
| 27 | the user is concerned but do serve to get the desired values when |
| 28 | passed to read_register. */ |
| 29 | |
| 30 | enum gdb_regnum { |
| 31 | ARM_A1_REGNUM = 0, /* first integer-like argument */ |
| 32 | ARM_A4_REGNUM = 3, /* last integer-like argument */ |
| 33 | ARM_AP_REGNUM = 11, |
| 34 | ARM_SP_REGNUM = 13, /* Contains address of top of stack */ |
| 35 | ARM_LR_REGNUM = 14, /* address to return to from a function call */ |
| 36 | ARM_PC_REGNUM = 15, /* Contains program counter */ |
| 37 | ARM_F0_REGNUM = 16, /* first floating point register */ |
| 38 | ARM_F3_REGNUM = 19, /* last floating point argument register */ |
| 39 | ARM_F7_REGNUM = 23, /* last floating point register */ |
| 40 | ARM_FPS_REGNUM = 24, /* floating point status register */ |
| 41 | ARM_PS_REGNUM = 25, /* Contains processor status */ |
| 42 | ARM_FP_REGNUM = 11, /* Frame register in ARM code, if used. */ |
| 43 | THUMB_FP_REGNUM = 7, /* Frame register in Thumb code, if used. */ |
| 44 | ARM_NUM_ARG_REGS = 4, |
| 45 | ARM_LAST_ARG_REGNUM = ARM_A4_REGNUM, |
| 46 | ARM_NUM_FP_ARG_REGS = 4, |
| 47 | ARM_LAST_FP_ARG_REGNUM = ARM_F3_REGNUM |
| 48 | }; |
| 49 | |
| 50 | /* Used in target-specific code when we need to know the size of the |
| 51 | largest type of register we need to handle. */ |
| 52 | #define ARM_MAX_REGISTER_RAW_SIZE 12 |
| 53 | #define ARM_MAX_REGISTER_VIRTUAL_SIZE 8 |
| 54 | |
| 55 | /* Size of integer registers. */ |
| 56 | #define INT_REGISTER_RAW_SIZE 4 |
| 57 | #define INT_REGISTER_VIRTUAL_SIZE 4 |
| 58 | |
| 59 | /* Say how long FP registers are. Used for documentation purposes and |
| 60 | code readability in this header. IEEE extended doubles are 80 |
| 61 | bits. DWORD aligned they use 96 bits. */ |
| 62 | #define FP_REGISTER_RAW_SIZE 12 |
| 63 | |
| 64 | /* GCC doesn't support long doubles (extended IEEE values). The FP |
| 65 | register virtual size is therefore 64 bits. Used for documentation |
| 66 | purposes and code readability in this header. */ |
| 67 | #define FP_REGISTER_VIRTUAL_SIZE 8 |
| 68 | |
| 69 | /* Status registers are the same size as general purpose registers. |
| 70 | Used for documentation purposes and code readability in this |
| 71 | header. */ |
| 72 | #define STATUS_REGISTER_SIZE 4 |
| 73 | |
| 74 | /* Number of machine registers. The only define actually required |
| 75 | is NUM_REGS. The other definitions are used for documentation |
| 76 | purposes and code readability. */ |
| 77 | /* For 26 bit ARM code, a fake copy of the PC is placed in register 25 (PS) |
| 78 | (and called PS for processor status) so the status bits can be cleared |
| 79 | from the PC (register 15). For 32 bit ARM code, a copy of CPSR is placed |
| 80 | in PS. */ |
| 81 | #define NUM_FREGS 8 /* Number of floating point registers. */ |
| 82 | #define NUM_SREGS 2 /* Number of status registers. */ |
| 83 | #define NUM_GREGS 16 /* Number of general purpose registers. */ |
| 84 | |
| 85 | |
| 86 | /* Instruction condition field values. */ |
| 87 | #define INST_EQ 0x0 |
| 88 | #define INST_NE 0x1 |
| 89 | #define INST_CS 0x2 |
| 90 | #define INST_CC 0x3 |
| 91 | #define INST_MI 0x4 |
| 92 | #define INST_PL 0x5 |
| 93 | #define INST_VS 0x6 |
| 94 | #define INST_VC 0x7 |
| 95 | #define INST_HI 0x8 |
| 96 | #define INST_LS 0x9 |
| 97 | #define INST_GE 0xa |
| 98 | #define INST_LT 0xb |
| 99 | #define INST_GT 0xc |
| 100 | #define INST_LE 0xd |
| 101 | #define INST_AL 0xe |
| 102 | #define INST_NV 0xf |
| 103 | |
| 104 | #define FLAG_N 0x80000000 |
| 105 | #define FLAG_Z 0x40000000 |
| 106 | #define FLAG_C 0x20000000 |
| 107 | #define FLAG_V 0x10000000 |
| 108 | |
| 109 | /* Type of floating-point code in use by inferior. There are really 3 models |
| 110 | that are traditionally supported (plus the endianness issue), but gcc can |
| 111 | only generate 2 of those. The third is APCS_FLOAT, where arguments to |
| 112 | functions are passed in floating-point registers. |
| 113 | |
| 114 | In addition to the traditional models, VFP adds two more. */ |
| 115 | |
| 116 | enum arm_float_model |
| 117 | { |
| 118 | ARM_FLOAT_SOFT, |
| 119 | ARM_FLOAT_FPA, |
| 120 | ARM_FLOAT_SOFT_VFP, |
| 121 | ARM_FLOAT_VFP |
| 122 | }; |
| 123 | |
| 124 | /* Target-dependent structure in gdbarch. */ |
| 125 | struct gdbarch_tdep |
| 126 | { |
| 127 | enum gdb_osabi osabi; /* OS/ABI of inferior. */ |
| 128 | |
| 129 | enum arm_float_model fp_model; /* Floating point calling conventions. */ |
| 130 | |
| 131 | CORE_ADDR lowest_pc; /* Lowest address at which instructions |
| 132 | will appear. */ |
| 133 | |
| 134 | const char *arm_breakpoint; /* Breakpoint pattern for an ARM insn. */ |
| 135 | int arm_breakpoint_size; /* And its size. */ |
| 136 | const char *thumb_breakpoint; /* Breakpoint pattern for an ARM insn. */ |
| 137 | int thumb_breakpoint_size; /* And its size. */ |
| 138 | |
| 139 | int jb_pc; /* Offset to PC value in jump buffer. |
| 140 | If this is negative, longjmp support |
| 141 | will be disabled. */ |
| 142 | size_t jb_elt_size; /* And the size of each entry in the buf. */ |
| 143 | }; |
| 144 | |
| 145 | #ifndef LOWEST_PC |
| 146 | #define LOWEST_PC (gdbarch_tdep (current_gdbarch)->lowest_pc) |
| 147 | #endif |
| 148 | |
| 149 | /* Prototypes for internal interfaces needed by more than one MD file. */ |
| 150 | int arm_pc_is_thumb_dummy (CORE_ADDR); |
| 151 | |
| 152 | int arm_pc_is_thumb (CORE_ADDR); |
| 153 | |
| 154 | CORE_ADDR thumb_get_next_pc (CORE_ADDR); |
| 155 | |
| 156 | CORE_ADDR arm_get_next_pc (CORE_ADDR); |