1/* FreeBSD/ARM specific low level interface, for the remote server for GDB. 2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 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 <sys/cdefs.h> 23__FBSDID("$FreeBSD$"); 24 25#include "server.h" 26#include "fbsd-low.h" 27 28#ifdef HAVE_SYS_REG_H 29#include <sys/reg.h> 30#endif 31 32#include <sys/procfs.h> 33#include <sys/ptrace.h> 34 35#define arm_num_regs 26 36 37static int arm_regmap[] = { 38 0, 4, 8, 12, 16, 20, 24, 28, 39 32, 36, 40, 44, 48, 52, 56, 60, 40 -1, -1, -1, -1, -1, -1, -1, -1, -1, 41 64 42}; 43 44static int 45arm_cannot_store_register (int regno) 46{ 47 return (regno >= arm_num_regs); 48} 49 50static int 51arm_cannot_fetch_register (int regno) 52{ 53 return (regno >= arm_num_regs); 54} 55 56extern int debug_threads; 57 58static CORE_ADDR 59arm_get_pc () 60{ 61 unsigned long pc; 62 collect_register_by_name ("pc", &pc); 63 if (debug_threads) 64 fprintf (stderr, "stop pc is %08lx\n", pc); 65 return pc; 66} 67 68static void 69arm_set_pc (CORE_ADDR pc) 70{ 71 unsigned long newpc = pc; 72 supply_register_by_name ("pc", &newpc); 73} 74 75/* Correct in either endianness. We do not support Thumb yet. */ 76static const unsigned long arm_breakpoint = 0xef9f0001; 77#define arm_breakpoint_len 4 78 79static int 80arm_breakpoint_at (CORE_ADDR where) 81{ 82 unsigned long insn; 83 84 (*the_target->read_memory) (where, (char *) &insn, 4); 85 if (insn == arm_breakpoint) 86 return 1; 87 88 /* If necessary, recognize more trap instructions here. GDB only uses the 89 one. */ 90 return 0; 91} 92 93/* We only place breakpoints in empty marker functions, and thread locking 94 is outside of the function. So rather than importing software single-step, 95 we can just run until exit. */ 96static CORE_ADDR 97arm_reinsert_addr () 98{ 99 unsigned long pc; 100 collect_register_by_name ("lr", &pc); 101 return pc; 102} 103 104static void 105arm_fill_gregset (void *buf) 106{ 107 int i; 108 109 for (i = 0; i < arm_num_regs; i++) 110 if (arm_regmap[i] != -1) 111 collect_register (i, ((char *) buf) + arm_regmap[i]); 112 113} 114 115static void 116arm_store_gregset (const void *buf) 117{ 118 int i; 119 120 for (i = 0; i < arm_num_regs; i++) 121 if (arm_regmap[i] != -1) 122 supply_register (i, ((char *) buf) + arm_regmap[i]); 123 124} 125 126 127struct regset_info target_regsets[] = { 128 {PT_GETREGS, PT_SETREGS, sizeof (struct reg), 129 GENERAL_REGS, 130 arm_fill_gregset, arm_store_gregset }, 131 { 0, 0, -1, -1, NULL, NULL } 132}; 133 134struct fbsd_target_ops the_low_target = { 135 arm_num_regs, 136 arm_regmap, 137 arm_cannot_fetch_register, 138 arm_cannot_store_register, 139 arm_get_pc, 140 arm_set_pc, 141 (const char *) &arm_breakpoint, 142 arm_breakpoint_len, 143 arm_reinsert_addr, 144 0, 145 arm_breakpoint_at, 146}; 147