| 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
| 2 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "linux-low.h" |
| 24 | #include <sys/ptrace.h> |
| 25 | |
| 26 | /* CRISv10 */ |
| 27 | #define cris_num_regs 32 |
| 28 | |
| 29 | /* Locations need to match <include/asm/arch/ptrace.h>. */ |
| 30 | static int cris_regmap[] = { |
| 31 | 15*4, 14*4, 13*4, 12*4, |
| 32 | 11*4, 10*4, 9*4, 8*4, |
| 33 | 7*4, 6*4, 5*4, 4*4, |
| 34 | 3*4, 2*4, 23*4, 19*4, |
| 35 | |
| 36 | -1, -1, -1, -1, |
| 37 | -1, 17*4, -1, 16*4, |
| 38 | -1, -1, -1, 18*4, |
| 39 | -1, 17*4, -1, -1 |
| 40 | |
| 41 | }; |
| 42 | |
| 43 | static int |
| 44 | cris_cannot_store_register (int regno) |
| 45 | { |
| 46 | if (cris_regmap[regno] == -1) |
| 47 | return 1; |
| 48 | |
| 49 | return (regno >= cris_num_regs); |
| 50 | } |
| 51 | |
| 52 | static int |
| 53 | cris_cannot_fetch_register (int regno) |
| 54 | { |
| 55 | if (cris_regmap[regno] == -1) |
| 56 | return 1; |
| 57 | |
| 58 | return (regno >= cris_num_regs); |
| 59 | } |
| 60 | |
| 61 | extern int debug_threads; |
| 62 | |
| 63 | static CORE_ADDR |
| 64 | cris_get_pc (void) |
| 65 | { |
| 66 | unsigned long pc; |
| 67 | collect_register_by_name ("pc", &pc); |
| 68 | if (debug_threads) |
| 69 | fprintf (stderr, "stop pc is %08lx\n", pc); |
| 70 | return pc; |
| 71 | } |
| 72 | |
| 73 | static void |
| 74 | cris_set_pc (CORE_ADDR pc) |
| 75 | { |
| 76 | unsigned long newpc = pc; |
| 77 | supply_register_by_name ("pc", &newpc); |
| 78 | } |
| 79 | |
| 80 | static const unsigned short cris_breakpoint = 0xe938; |
| 81 | #define cris_breakpoint_len 2 |
| 82 | |
| 83 | static int |
| 84 | cris_breakpoint_at (CORE_ADDR where) |
| 85 | { |
| 86 | unsigned short insn; |
| 87 | |
| 88 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
| 89 | cris_breakpoint_len); |
| 90 | if (insn == cris_breakpoint) |
| 91 | return 1; |
| 92 | |
| 93 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 94 | one. */ |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /* We only place breakpoints in empty marker functions, and thread locking |
| 99 | is outside of the function. So rather than importing software single-step, |
| 100 | we can just run until exit. */ |
| 101 | static CORE_ADDR |
| 102 | cris_reinsert_addr (void) |
| 103 | { |
| 104 | unsigned long pc; |
| 105 | collect_register_by_name ("srp", &pc); |
| 106 | return pc; |
| 107 | } |
| 108 | |
| 109 | struct linux_target_ops the_low_target = { |
| 110 | cris_num_regs, |
| 111 | cris_regmap, |
| 112 | cris_cannot_fetch_register, |
| 113 | cris_cannot_store_register, |
| 114 | cris_get_pc, |
| 115 | cris_set_pc, |
| 116 | (const unsigned char *) &cris_breakpoint, |
| 117 | cris_breakpoint_len, |
| 118 | cris_reinsert_addr, |
| 119 | 0, |
| 120 | cris_breakpoint_at, |
| 121 | 0, |
| 122 | 0, |
| 123 | 0, |
| 124 | 0, |
| 125 | }; |