diff options
Diffstat (limited to 'gnu/usr.bin/gdb/gdbserver/fbsd-arm-low.c')
-rw-r--r-- | gnu/usr.bin/gdb/gdbserver/fbsd-arm-low.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/gnu/usr.bin/gdb/gdbserver/fbsd-arm-low.c b/gnu/usr.bin/gdb/gdbserver/fbsd-arm-low.c new file mode 100644 index 0000000..faea705 --- /dev/null +++ b/gnu/usr.bin/gdb/gdbserver/fbsd-arm-low.c @@ -0,0 +1,146 @@ +/* FreeBSD/ARM specific low level interface, for the remote server for GDB. + Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 + 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "server.h" +#include "fbsd-low.h" + +#ifdef HAVE_SYS_REG_H +#include <sys/reg.h> +#endif + +#include <sys/procfs.h> +#include <sys/ptrace.h> + +#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 + +static int +arm_breakpoint_at (CORE_ADDR where) +{ + unsigned long insn; + + (*the_target->read_memory) (where, (char *) &insn, 4); + if (insn == arm_breakpoint) + return 1; + + /* If necessary, recognize more trap instructions here. GDB only uses the + one. */ + 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; +} + +static void +arm_fill_gregset (void *buf) +{ + int i; + + for (i = 0; i < arm_num_regs; i++) + if (arm_regmap[i] != -1) + collect_register (i, ((char *) buf) + arm_regmap[i]); + +} + +static void +arm_store_gregset (const void *buf) +{ + int i; + + for (i = 0; i < arm_num_regs; i++) + if (arm_regmap[i] != -1) + supply_register (i, ((char *) buf) + arm_regmap[i]); + +} + + +struct regset_info target_regsets[] = { + {PT_GETREGS, PT_SETREGS, sizeof (struct reg), + GENERAL_REGS, + arm_fill_gregset, arm_store_gregset }, + { 0, 0, -1, -1, NULL, NULL } +}; + +struct fbsd_target_ops the_low_target = { + arm_num_regs, + arm_regmap, + arm_cannot_fetch_register, + arm_cannot_store_register, + arm_get_pc, + arm_set_pc, + (const char *) &arm_breakpoint, + arm_breakpoint_len, + arm_reinsert_addr, + 0, + arm_breakpoint_at, +}; |