| 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
| 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
| 3 | 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "server.h" |
| 21 | #include "linux-low.h" |
| 22 | #include <sys/ptrace.h> |
| 23 | |
| 24 | /* Defined in auto-generated file reg-cris.c. */ |
| 25 | void init_registers_cris (void); |
| 26 | |
| 27 | /* CRISv10 */ |
| 28 | #define cris_num_regs 32 |
| 29 | |
| 30 | /* Locations need to match <include/asm/arch/ptrace.h>. */ |
| 31 | static int cris_regmap[] = { |
| 32 | 15*4, 14*4, 13*4, 12*4, |
| 33 | 11*4, 10*4, 9*4, 8*4, |
| 34 | 7*4, 6*4, 5*4, 4*4, |
| 35 | 3*4, 2*4, 23*4, 19*4, |
| 36 | |
| 37 | -1, -1, -1, -1, |
| 38 | -1, 17*4, -1, 16*4, |
| 39 | -1, -1, -1, 18*4, |
| 40 | -1, 17*4, -1, -1 |
| 41 | |
| 42 | }; |
| 43 | |
| 44 | static int |
| 45 | cris_cannot_store_register (int regno) |
| 46 | { |
| 47 | if (cris_regmap[regno] == -1) |
| 48 | return 1; |
| 49 | |
| 50 | return (regno >= cris_num_regs); |
| 51 | } |
| 52 | |
| 53 | static int |
| 54 | cris_cannot_fetch_register (int regno) |
| 55 | { |
| 56 | if (cris_regmap[regno] == -1) |
| 57 | return 1; |
| 58 | |
| 59 | return (regno >= cris_num_regs); |
| 60 | } |
| 61 | |
| 62 | extern int debug_threads; |
| 63 | |
| 64 | static CORE_ADDR |
| 65 | cris_get_pc (struct regcache *regcache, void) |
| 66 | { |
| 67 | unsigned long pc; |
| 68 | collect_register_by_name (regcache, "pc", &pc); |
| 69 | if (debug_threads) |
| 70 | fprintf (stderr, "stop pc is %08lx\n", pc); |
| 71 | return pc; |
| 72 | } |
| 73 | |
| 74 | static void |
| 75 | cris_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 76 | { |
| 77 | unsigned long newpc = pc; |
| 78 | supply_register_by_name (regcache, "pc", &newpc); |
| 79 | } |
| 80 | |
| 81 | static const unsigned short cris_breakpoint = 0xe938; |
| 82 | #define cris_breakpoint_len 2 |
| 83 | |
| 84 | static int |
| 85 | cris_breakpoint_at (CORE_ADDR where) |
| 86 | { |
| 87 | unsigned short insn; |
| 88 | |
| 89 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
| 90 | cris_breakpoint_len); |
| 91 | if (insn == cris_breakpoint) |
| 92 | return 1; |
| 93 | |
| 94 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 95 | one. */ |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | /* We only place breakpoints in empty marker functions, and thread locking |
| 100 | is outside of the function. So rather than importing software single-step, |
| 101 | we can just run until exit. */ |
| 102 | static CORE_ADDR |
| 103 | cris_reinsert_addr (void) |
| 104 | { |
| 105 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
| 106 | unsigned long pc; |
| 107 | collect_register_by_name (regcache, "srp", &pc); |
| 108 | return pc; |
| 109 | } |
| 110 | |
| 111 | struct linux_target_ops the_low_target = { |
| 112 | init_registers_cris, |
| 113 | cris_num_regs, |
| 114 | cris_regmap, |
| 115 | cris_cannot_fetch_register, |
| 116 | cris_cannot_store_register, |
| 117 | cris_get_pc, |
| 118 | cris_set_pc, |
| 119 | (const unsigned char *) &cris_breakpoint, |
| 120 | cris_breakpoint_len, |
| 121 | cris_reinsert_addr, |
| 122 | 0, |
| 123 | cris_breakpoint_at, |
| 124 | 0, |
| 125 | 0, |
| 126 | 0, |
| 127 | 0, |
| 128 | }; |