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147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/* FreeBSD/ARM specific low level interface, for the remote server for GDB.
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Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "server.h"
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#include "fbsd-low.h"
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include <sys/procfs.h>
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#include <sys/ptrace.h>
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#define arm_num_regs 26
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static int arm_regmap[] = {
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0, 4, 8, 12, 16, 20, 24, 28,
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32, 36, 40, 44, 48, 52, 56, 60,
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-1, -1, -1, -1, -1, -1, -1, -1, -1,
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64
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};
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static int
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arm_cannot_store_register (int regno)
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{
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return (regno >= arm_num_regs);
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}
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static int
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arm_cannot_fetch_register (int regno)
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{
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return (regno >= arm_num_regs);
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}
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extern int debug_threads;
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static CORE_ADDR
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arm_get_pc ()
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{
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unsigned long pc;
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collect_register_by_name ("pc", &pc);
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if (debug_threads)
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fprintf (stderr, "stop pc is %08lx\n", pc);
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return pc;
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}
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static void
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arm_set_pc (CORE_ADDR pc)
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{
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unsigned long newpc = pc;
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supply_register_by_name ("pc", &newpc);
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}
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/* Correct in either endianness. We do not support Thumb yet. */
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static const unsigned long arm_breakpoint = 0xef9f0001;
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#define arm_breakpoint_len 4
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static int
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arm_breakpoint_at (CORE_ADDR where)
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{
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unsigned long insn;
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(*the_target->read_memory) (where, (char *) &insn, 4);
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if (insn == arm_breakpoint)
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return 1;
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/* If necessary, recognize more trap instructions here. GDB only uses the
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one. */
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return 0;
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}
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/* We only place breakpoints in empty marker functions, and thread locking
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is outside of the function. So rather than importing software single-step,
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we can just run until exit. */
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static CORE_ADDR
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arm_reinsert_addr ()
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{
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unsigned long pc;
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collect_register_by_name ("lr", &pc);
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return pc;
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}
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static void
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arm_fill_gregset (void *buf)
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{
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int i;
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for (i = 0; i < arm_num_regs; i++)
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if (arm_regmap[i] != -1)
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collect_register (i, ((char *) buf) + arm_regmap[i]);
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}
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static void
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arm_store_gregset (const void *buf)
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{
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int i;
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for (i = 0; i < arm_num_regs; i++)
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if (arm_regmap[i] != -1)
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supply_register (i, ((char *) buf) + arm_regmap[i]);
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}
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struct regset_info target_regsets[] = {
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{PT_GETREGS, PT_SETREGS, sizeof (struct reg),
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GENERAL_REGS,
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arm_fill_gregset, arm_store_gregset },
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{ 0, 0, -1, -1, NULL, NULL }
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};
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struct fbsd_target_ops the_low_target = {
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arm_num_regs,
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arm_regmap,
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arm_cannot_fetch_register,
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arm_cannot_store_register,
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arm_get_pc,
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arm_set_pc,
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(const char *) &arm_breakpoint,
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arm_breakpoint_len,
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arm_reinsert_addr,
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0,
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arm_breakpoint_at,
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};
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