| 1 | /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB. |
| 2 | |
| 3 | Copyright (C) 2005-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Analog Devices, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "linux-low.h" |
| 24 | #include <asm/ptrace.h> |
| 25 | |
| 26 | /* Defined in auto-generated file reg-bfin.c. */ |
| 27 | void init_registers_bfin (void); |
| 28 | extern const struct target_desc *tdesc_bfin; |
| 29 | |
| 30 | static int bfin_regmap[] = |
| 31 | { |
| 32 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, |
| 33 | PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP, |
| 34 | PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3, |
| 35 | PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3, |
| 36 | PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS, |
| 37 | PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1, |
| 38 | -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */, |
| 39 | -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE, |
| 40 | PT_PC, |
| 41 | }; |
| 42 | |
| 43 | #define bfin_num_regs ARRAY_SIZE (bfin_regmap) |
| 44 | |
| 45 | static int |
| 46 | bfin_cannot_store_register (int regno) |
| 47 | { |
| 48 | return (regno >= bfin_num_regs); |
| 49 | } |
| 50 | |
| 51 | static int |
| 52 | bfin_cannot_fetch_register (int regno) |
| 53 | { |
| 54 | return (regno >= bfin_num_regs); |
| 55 | } |
| 56 | |
| 57 | static CORE_ADDR |
| 58 | bfin_get_pc (struct regcache *regcache) |
| 59 | { |
| 60 | unsigned long pc; |
| 61 | |
| 62 | collect_register_by_name (regcache, "pc", &pc); |
| 63 | |
| 64 | return pc; |
| 65 | } |
| 66 | |
| 67 | static void |
| 68 | bfin_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 69 | { |
| 70 | unsigned long newpc = pc; |
| 71 | |
| 72 | supply_register_by_name (regcache, "pc", &newpc); |
| 73 | } |
| 74 | |
| 75 | #define bfin_breakpoint_len 2 |
| 76 | static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00}; |
| 77 | |
| 78 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
| 79 | |
| 80 | static const gdb_byte * |
| 81 | bfin_sw_breakpoint_from_kind (int kind, int *size) |
| 82 | { |
| 83 | *size = bfin_breakpoint_len; |
| 84 | return bfin_breakpoint; |
| 85 | } |
| 86 | |
| 87 | static int |
| 88 | bfin_breakpoint_at (CORE_ADDR where) |
| 89 | { |
| 90 | unsigned char insn[bfin_breakpoint_len]; |
| 91 | |
| 92 | read_inferior_memory(where, insn, bfin_breakpoint_len); |
| 93 | if (insn[0] == bfin_breakpoint[0] |
| 94 | && insn[1] == bfin_breakpoint[1]) |
| 95 | return 1; |
| 96 | |
| 97 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 98 | one. */ |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static void |
| 103 | bfin_arch_setup (void) |
| 104 | { |
| 105 | current_process ()->tdesc = tdesc_bfin; |
| 106 | } |
| 107 | |
| 108 | static struct usrregs_info bfin_usrregs_info = |
| 109 | { |
| 110 | bfin_num_regs, |
| 111 | bfin_regmap, |
| 112 | }; |
| 113 | |
| 114 | static struct regs_info regs_info = |
| 115 | { |
| 116 | NULL, /* regset_bitmap */ |
| 117 | &bfin_usrregs_info, |
| 118 | }; |
| 119 | |
| 120 | static const struct regs_info * |
| 121 | bfin_regs_info (void) |
| 122 | { |
| 123 | return ®s_info; |
| 124 | } |
| 125 | |
| 126 | struct linux_target_ops the_low_target = { |
| 127 | bfin_arch_setup, |
| 128 | bfin_regs_info, |
| 129 | bfin_cannot_fetch_register, |
| 130 | bfin_cannot_store_register, |
| 131 | NULL, /* fetch_register */ |
| 132 | bfin_get_pc, |
| 133 | bfin_set_pc, |
| 134 | NULL, /* breakpoint_kind_from_pc */ |
| 135 | bfin_sw_breakpoint_from_kind, |
| 136 | NULL, /* breakpoint_reinsert_addr */ |
| 137 | 2, |
| 138 | bfin_breakpoint_at, |
| 139 | }; |
| 140 | |
| 141 | |
| 142 | void |
| 143 | initialize_low_arch (void) |
| 144 | { |
| 145 | init_registers_bfin (); |
| 146 | } |