trgt_arm.c revision 246893
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 246893 2013-02-17 02:15:19Z marcel $"); 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 50CORE_ADDR 51kgdb_trgt_core_pcb(u_int cpuid) 52{ 53 return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb))); 54} 55 56void 57kgdb_trgt_fetch_registers(int regno __unused) 58{ 59#ifndef CROSS_DEBUGGER 60 struct kthr *kt; 61 struct pcb pcb; 62 int i, reg; 63 64 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid)); 65 if (kt == NULL) 66 return; 67 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) { 68 warnx("kvm_read: %s", kvm_geterr(kvm)); 69 memset(&pcb, 0, sizeof(pcb)); 70 } 71 for (i = ARM_A1_REGNUM + 8; i <= ARM_SP_REGNUM; i++) { 72 supply_register(i, (char *)&pcb.un_32.pcb32_r8 + 73 (i - (ARM_A1_REGNUM + 8 )) * 4); 74 } 75 if (pcb.un_32.pcb32_sp != 0) { 76 for (i = 0; i < 4; i++) { 77 if (kvm_read(kvm, pcb.un_32.pcb32_sp + (i) * 4, 78 ®, 4) != 4) { 79 warnx("kvm_read: %s", kvm_geterr(kvm)); 80 break; 81 } 82 supply_register(ARM_A1_REGNUM + 4 + i, (char *)®); 83 } 84 if (kvm_read(kvm, pcb.un_32.pcb32_sp + 4 * 4, ®, 4) != 4) 85 warnx("kvm_read :%s", kvm_geterr(kvm)); 86 else 87 supply_register(ARM_PC_REGNUM, (char *)®); 88 } 89#endif 90} 91 92void 93kgdb_trgt_store_registers(int regno __unused) 94{ 95 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 96} 97 98void 99kgdb_trgt_new_objfile(struct objfile *objfile) 100{ 101} 102 103#ifndef CROSS_DEBUGGER 104struct kgdb_frame_cache { 105 CORE_ADDR fp; 106 CORE_ADDR sp; 107}; 108 109static int kgdb_trgt_frame_offset[26] = { 110 offsetof(struct trapframe, tf_r0), 111 offsetof(struct trapframe, tf_r1), 112 offsetof(struct trapframe, tf_r2), 113 offsetof(struct trapframe, tf_r3), 114 offsetof(struct trapframe, tf_r4), 115 offsetof(struct trapframe, tf_r5), 116 offsetof(struct trapframe, tf_r6), 117 offsetof(struct trapframe, tf_r7), 118 offsetof(struct trapframe, tf_r8), 119 offsetof(struct trapframe, tf_r9), 120 offsetof(struct trapframe, tf_r10), 121 offsetof(struct trapframe, tf_r11), 122 offsetof(struct trapframe, tf_r12), 123 offsetof(struct trapframe, tf_svc_sp), 124 offsetof(struct trapframe, tf_svc_lr), 125 offsetof(struct trapframe, tf_pc), 126 -1, -1, -1, -1, -1, -1, -1, -1, -1, 127 offsetof(struct trapframe, tf_spsr) 128}; 129 130static struct kgdb_frame_cache * 131kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 132{ 133 char buf[MAX_REGISTER_SIZE]; 134 struct kgdb_frame_cache *cache; 135 136 cache = *this_cache; 137 if (cache == NULL) { 138 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 139 *this_cache = cache; 140 frame_unwind_register(next_frame, ARM_SP_REGNUM, buf); 141 cache->sp = extract_unsigned_integer(buf, 142 register_size(current_gdbarch, ARM_SP_REGNUM)); 143 frame_unwind_register(next_frame, ARM_FP_REGNUM, buf); 144 cache->fp = extract_unsigned_integer(buf, 145 register_size(current_gdbarch, ARM_FP_REGNUM)); 146 } 147 return (cache); 148} 149 150static int is_undef; 151 152static void 153kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 154 struct frame_id *this_id) 155{ 156 struct kgdb_frame_cache *cache; 157 158 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 159 *this_id = frame_id_build(cache->fp, 0); 160} 161 162static void 163kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 164 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 165 CORE_ADDR *addrp, int *realnump, void *valuep) 166{ 167 char dummy_valuep[MAX_REGISTER_SIZE]; 168 struct kgdb_frame_cache *cache; 169 int ofs, regsz; 170 int is_undefined = 0; 171 172 regsz = register_size(current_gdbarch, regnum); 173 174 if (valuep == NULL) 175 valuep = dummy_valuep; 176 memset(valuep, 0, regsz); 177 *optimizedp = 0; 178 *addrp = 0; 179 *lvalp = not_lval; 180 *realnump = -1; 181 182 ofs = (regnum >= 0 && regnum <= ARM_PS_REGNUM) 183 ? kgdb_trgt_frame_offset[regnum] : -1; 184 if (ofs == -1) 185 return; 186 187 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 188 189 if (is_undef && (regnum == ARM_SP_REGNUM || regnum == ARM_PC_REGNUM)) { 190 *addrp = cache->sp + offsetof(struct trapframe, tf_spsr); 191 target_read_memory(*addrp, valuep, regsz); 192 is_undefined = 1; 193 ofs = kgdb_trgt_frame_offset[ARM_SP_REGNUM]; 194 195 } 196 *addrp = cache->sp + ofs; 197 *lvalp = lval_memory; 198 target_read_memory(*addrp, valuep, regsz); 199 200 if (is_undefined) { 201 *addrp = *(unsigned int *)valuep + (regnum == ARM_SP_REGNUM ? 202 0 : 8); 203 target_read_memory(*addrp, valuep, regsz); 204 205 } 206} 207 208static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 209 UNKNOWN_FRAME, 210 &kgdb_trgt_trapframe_this_id, 211 &kgdb_trgt_trapframe_prev_register 212}; 213#endif 214 215const struct frame_unwind * 216kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 217{ 218#ifndef CROSS_DEBUGGER 219 char *pname; 220 CORE_ADDR pc; 221 222 pc = frame_pc_unwind(next_frame); 223 pname = NULL; 224 find_pc_partial_function(pc, &pname, NULL, NULL); 225 if (pname == NULL) { 226 is_undef = 0; 227 return (NULL); 228 } 229 if (!strcmp(pname, "undefinedinstruction")) 230 is_undef = 1; 231 if (strcmp(pname, "Laddress_exception_entry") == 0 || 232 strcmp(pname, "undefined_entry") == 0 || 233 strcmp(pname, "exception_exit") == 0 || 234 strcmp(pname, "Laddress_exception_msg") == 0 || 235 strcmp(pname, "irq_entry") == 0) 236 return (&kgdb_trgt_trapframe_unwind); 237 if (!strcmp(pname, "undefinedinstruction")) 238 is_undef = 1; 239 else 240 is_undef = 0; 241#endif 242 return (NULL); 243} 244