trgt_arm.c revision 162303
1/* 2 * Copyright (c) 2004 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/gnu/usr.bin/gdb/kgdb/trgt_arm.c 162303 2006-09-14 07:51:52Z imp $"); 29 30#include <sys/types.h> 31#ifndef CROSS_DEBUGGER 32#include <machine/pcb.h> 33#include <machine/frame.h> 34#include <machine/armreg.h> 35#endif 36#include <err.h> 37#include <kvm.h> 38#include <string.h> 39 40#include <defs.h> 41#include <target.h> 42#include <gdbthread.h> 43#include <inferior.h> 44#include <regcache.h> 45#include <frame-unwind.h> 46#include <arm-tdep.h> 47 48#include "kgdb.h" 49 50void 51kgdb_trgt_fetch_registers(int regno __unused) 52{ 53#ifndef CROSS_DEBUGGER 54 struct kthr *kt; 55 struct pcb pcb; 56 int i, reg; 57 58 kt = kgdb_thr_lookup_tid(ptid_get_tid(inferior_ptid)); 59 if (kt == NULL) 60 return; 61 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) { 62 warnx("kvm_read: %s", kvm_geterr(kvm)); 63 memset(&pcb, 0, sizeof(pcb)); 64 } 65 for (i = ARM_A1_REGNUM + 8; i <= ARM_SP_REGNUM; i++) { 66 supply_register(i, (char *)&pcb.un_32.pcb32_r8 + 67 (i - (ARM_A1_REGNUM + 8 )) * 4); 68 } 69 if (pcb.un_32.pcb32_sp != 0) { 70 for (i = 0; i < 4; i++) { 71 if (kvm_read(kvm, pcb.un_32.pcb32_sp + (i) * 4, 72 ®, 4) != 4) { 73 warnx("kvm_read: %s", kvm_geterr(kvm)); 74 break; 75 } 76 supply_register(ARM_A1_REGNUM + 4 + i, (char *)®); 77 } 78 if (kvm_read(kvm, pcb.un_32.pcb32_sp + 4 * 4, ®, 4) != 4) 79 warnx("kvm_read :%s", kvm_geterr(kvm)); 80 else 81 supply_register(ARM_PC_REGNUM, (char *)®); 82 } 83#endif 84} 85 86void 87kgdb_trgt_store_registers(int regno __unused) 88{ 89 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 90} 91 92#ifndef CROSS_DEBUGGER 93struct kgdb_frame_cache { 94 CORE_ADDR fp; 95 CORE_ADDR sp; 96}; 97 98static int kgdb_trgt_frame_offset[26] = { 99 offsetof(struct trapframe, tf_r0), 100 offsetof(struct trapframe, tf_r1), 101 offsetof(struct trapframe, tf_r2), 102 offsetof(struct trapframe, tf_r3), 103 offsetof(struct trapframe, tf_r4), 104 offsetof(struct trapframe, tf_r5), 105 offsetof(struct trapframe, tf_r6), 106 offsetof(struct trapframe, tf_r7), 107 offsetof(struct trapframe, tf_r8), 108 offsetof(struct trapframe, tf_r9), 109 offsetof(struct trapframe, tf_r10), 110 offsetof(struct trapframe, tf_r11), 111 offsetof(struct trapframe, tf_r12), 112 offsetof(struct trapframe, tf_svc_sp), 113 offsetof(struct trapframe, tf_svc_lr), 114 offsetof(struct trapframe, tf_pc), 115 -1, -1, -1, -1, -1, -1, -1, -1, -1, 116 offsetof(struct trapframe, tf_spsr) 117}; 118 119static struct kgdb_frame_cache * 120kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 121{ 122 char buf[MAX_REGISTER_SIZE]; 123 struct kgdb_frame_cache *cache; 124 125 cache = *this_cache; 126 if (cache == NULL) { 127 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 128 *this_cache = cache; 129 frame_unwind_register(next_frame, ARM_SP_REGNUM, buf); 130 cache->sp = extract_unsigned_integer(buf, 131 register_size(current_gdbarch, ARM_SP_REGNUM)); 132 frame_unwind_register(next_frame, ARM_FP_REGNUM, buf); 133 cache->fp = extract_unsigned_integer(buf, 134 register_size(current_gdbarch, ARM_FP_REGNUM)); 135 } 136 return (cache); 137} 138 139static int is_undef; 140 141static void 142kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 143 struct frame_id *this_id) 144{ 145 struct kgdb_frame_cache *cache; 146 147 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 148 *this_id = frame_id_build(cache->fp, 0); 149} 150 151static void 152kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 153 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 154 CORE_ADDR *addrp, int *realnump, void *valuep) 155{ 156 char dummy_valuep[MAX_REGISTER_SIZE]; 157 struct kgdb_frame_cache *cache; 158 int ofs, regsz; 159 int is_undefined = 0; 160 161 regsz = register_size(current_gdbarch, regnum); 162 163 if (valuep == NULL) 164 valuep = dummy_valuep; 165 memset(valuep, 0, regsz); 166 *optimizedp = 0; 167 *addrp = 0; 168 *lvalp = not_lval; 169 *realnump = -1; 170 171 ofs = (regnum >= 0 && regnum <= ARM_PS_REGNUM) 172 ? kgdb_trgt_frame_offset[regnum] : -1; 173 if (ofs == -1) 174 return; 175 176 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 177 178 if (is_undef && (regnum == ARM_SP_REGNUM || regnum == ARM_PC_REGNUM)) { 179 *addrp = cache->sp + offsetof(struct trapframe, tf_spsr); 180 target_read_memory(*addrp, valuep, regsz); 181 is_undefined = 1; 182 ofs = kgdb_trgt_frame_offset[ARM_SP_REGNUM]; 183 184 } 185 *addrp = cache->sp + ofs; 186 *lvalp = lval_memory; 187 target_read_memory(*addrp, valuep, regsz); 188 189 if (is_undefined) { 190 *addrp = *(unsigned int *)valuep + (regnum == ARM_SP_REGNUM ? 191 0 : 8); 192 target_read_memory(*addrp, valuep, regsz); 193 194 } 195} 196 197static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 198 UNKNOWN_FRAME, 199 &kgdb_trgt_trapframe_this_id, 200 &kgdb_trgt_trapframe_prev_register 201}; 202#endif 203 204const struct frame_unwind * 205kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 206{ 207#ifndef CROSS_DEBUGGER 208 char *pname; 209 CORE_ADDR pc; 210 211 pc = frame_pc_unwind(next_frame); 212 pname = NULL; 213 find_pc_partial_function(pc, &pname, NULL, NULL); 214 if (pname == NULL) { 215 is_undef = 0; 216 return (NULL); 217 } 218 if (!strcmp(pname, "undefinedinstruction")) 219 is_undef = 1; 220 if (strcmp(pname, "Laddress_exception_entry") == 0 || 221 strcmp(pname, "undefined_entry") == 0 || 222 strcmp(pname, "exception_exit") == 0 || 223 strcmp(pname, "Laddress_exception_msg") == 0 || 224 strcmp(pname, "irq_entry") == 0) 225 return (&kgdb_trgt_trapframe_unwind); 226 if (!strcmp(pname, "undefinedinstruction")) 227 is_undef = 1; 228 else 229 is_undef = 0; 230#endif 231 return (NULL); 232} 233