| /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "server.h" |
| #include "linux-low.h" |
| |
| #ifdef HAVE_SYS_REG_H |
| #include <sys/reg.h> |
| #endif |
| |
| #define arm_num_regs 26 |
| |
| static int arm_regmap[] = { |
| 0, 4, 8, 12, 16, 20, 24, 28, |
| 32, 36, 40, 44, 48, 52, 56, 60, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 64 |
| }; |
| |
| static int |
| arm_cannot_store_register (int regno) |
| { |
| return (regno >= arm_num_regs); |
| } |
| |
| static int |
| arm_cannot_fetch_register (int regno) |
| { |
| return (regno >= arm_num_regs); |
| } |
| |
| extern int debug_threads; |
| |
| static CORE_ADDR |
| arm_get_pc () |
| { |
| unsigned long pc; |
| collect_register_by_name ("pc", &pc); |
| if (debug_threads) |
| fprintf (stderr, "stop pc is %08lx\n", pc); |
| return pc; |
| } |
| |
| static void |
| arm_set_pc (CORE_ADDR pc) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name ("pc", &newpc); |
| } |
| |
| /* Correct in either endianness. We do not support Thumb yet. */ |
| static const unsigned long arm_breakpoint = 0xef9f0001; |
| #define arm_breakpoint_len 4 |
| |
| /* For new EABI binaries. We recognize it regardless of which ABI |
| is used for gdbserver, so single threaded debugging should work |
| OK, but for multi-threaded debugging we only insert the current |
| ABI's breakpoint instruction. For now at least. */ |
| static const unsigned long arm_eabi_breakpoint = 0xe7f001f0; |
| |
| static int |
| arm_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned long insn; |
| |
| (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
| if (insn == arm_breakpoint) |
| return 1; |
| |
| if (insn == arm_eabi_breakpoint) |
| return 1; |
| |
| /* If necessary, recognize more trap instructions here. GDB only uses the |
| two. */ |
| |
| return 0; |
| } |
| |
| /* We only place breakpoints in empty marker functions, and thread locking |
| is outside of the function. So rather than importing software single-step, |
| we can just run until exit. */ |
| static CORE_ADDR |
| arm_reinsert_addr () |
| { |
| unsigned long pc; |
| collect_register_by_name ("lr", &pc); |
| return pc; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| arm_num_regs, |
| arm_regmap, |
| arm_cannot_fetch_register, |
| arm_cannot_store_register, |
| arm_get_pc, |
| arm_set_pc, |
| #ifndef __ARM_EABI__ |
| (const unsigned char *) &arm_breakpoint, |
| #else |
| (const unsigned char *) &arm_eabi_breakpoint, |
| #endif |
| arm_breakpoint_len, |
| arm_reinsert_addr, |
| 0, |
| arm_breakpoint_at, |
| }; |