trgt_arm.c revision 290193
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 290193 2015-10-30 12:37:40Z zbb $"); 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#ifndef CROSS_DEBUGGER 54 return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb))); 55#else 56 return -1; 57#endif 58} 59 60void 61kgdb_trgt_fetch_registers(int regno __unused) 62{ 63#ifndef CROSS_DEBUGGER 64 struct kthr *kt; 65 struct pcb pcb; 66 int i; 67 68 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid)); 69 if (kt == NULL) 70 return; 71 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) { 72 warnx("kvm_read: %s", kvm_geterr(kvm)); 73 memset(&pcb, 0, sizeof(pcb)); 74 } 75 for (i = ARM_A1_REGNUM + 4; i <= ARM_SP_REGNUM; i++) { 76 supply_register(i, (char *)&pcb.pcb_regs.sf_r4 + 77 (i - (ARM_A1_REGNUM + 4 )) * 4); 78 } 79 supply_register(ARM_PC_REGNUM, (char *)&pcb.pcb_regs.sf_pc); 80 supply_register(ARM_LR_REGNUM, (char *)&pcb.pcb_regs.sf_lr); 81#endif 82} 83 84void 85kgdb_trgt_store_registers(int regno __unused) 86{ 87 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 88} 89 90void 91kgdb_trgt_new_objfile(struct objfile *objfile) 92{ 93} 94 95#ifndef CROSS_DEBUGGER 96struct kgdb_frame_cache { 97 CORE_ADDR fp; 98 CORE_ADDR sp; 99}; 100 101static int kgdb_trgt_frame_offset[26] = { 102 offsetof(struct trapframe, tf_r0), 103 offsetof(struct trapframe, tf_r1), 104 offsetof(struct trapframe, tf_r2), 105 offsetof(struct trapframe, tf_r3), 106 offsetof(struct trapframe, tf_r4), 107 offsetof(struct trapframe, tf_r5), 108 offsetof(struct trapframe, tf_r6), 109 offsetof(struct trapframe, tf_r7), 110 offsetof(struct trapframe, tf_r8), 111 offsetof(struct trapframe, tf_r9), 112 offsetof(struct trapframe, tf_r10), 113 offsetof(struct trapframe, tf_r11), 114 offsetof(struct trapframe, tf_r12), 115 offsetof(struct trapframe, tf_svc_sp), 116 offsetof(struct trapframe, tf_svc_lr), 117 offsetof(struct trapframe, tf_pc), 118 -1, -1, -1, -1, -1, -1, -1, -1, -1, 119 offsetof(struct trapframe, tf_spsr) 120}; 121 122static struct kgdb_frame_cache * 123kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 124{ 125 char buf[MAX_REGISTER_SIZE]; 126 struct kgdb_frame_cache *cache; 127 128 cache = *this_cache; 129 if (cache == NULL) { 130 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 131 *this_cache = cache; 132 frame_unwind_register(next_frame, ARM_SP_REGNUM, buf); 133 cache->sp = extract_unsigned_integer(buf, 134 register_size(current_gdbarch, ARM_SP_REGNUM)); 135 frame_unwind_register(next_frame, ARM_FP_REGNUM, buf); 136 cache->fp = extract_unsigned_integer(buf, 137 register_size(current_gdbarch, ARM_FP_REGNUM)); 138 } 139 return (cache); 140} 141 142static int is_undef; 143 144static void 145kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 146 struct frame_id *this_id) 147{ 148 struct kgdb_frame_cache *cache; 149 150 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 151 *this_id = frame_id_build(cache->fp, 0); 152} 153 154static void 155kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 156 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 157 CORE_ADDR *addrp, int *realnump, void *valuep) 158{ 159 char dummy_valuep[MAX_REGISTER_SIZE]; 160 struct kgdb_frame_cache *cache; 161 int ofs, regsz; 162 int is_undefined = 0; 163 164 regsz = register_size(current_gdbarch, regnum); 165 166 if (valuep == NULL) 167 valuep = dummy_valuep; 168 memset(valuep, 0, regsz); 169 *optimizedp = 0; 170 *addrp = 0; 171 *lvalp = not_lval; 172 *realnump = -1; 173 174 ofs = (regnum >= 0 && regnum <= ARM_PS_REGNUM) 175 ? kgdb_trgt_frame_offset[regnum] : -1; 176 if (ofs == -1) 177 return; 178 179 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 180 181 if (is_undef && (regnum == ARM_SP_REGNUM || regnum == ARM_PC_REGNUM)) { 182 *addrp = cache->sp + offsetof(struct trapframe, tf_spsr); 183 target_read_memory(*addrp, valuep, regsz); 184 is_undefined = 1; 185 ofs = kgdb_trgt_frame_offset[ARM_SP_REGNUM]; 186 187 } 188 *addrp = cache->sp + ofs; 189 *lvalp = lval_memory; 190 target_read_memory(*addrp, valuep, regsz); 191 192 if (is_undefined) { 193 *addrp = *(unsigned int *)valuep + (regnum == ARM_SP_REGNUM ? 194 0 : 8); 195 target_read_memory(*addrp, valuep, regsz); 196 197 } 198} 199 200static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 201 UNKNOWN_FRAME, 202 &kgdb_trgt_trapframe_this_id, 203 &kgdb_trgt_trapframe_prev_register 204}; 205#endif 206 207const struct frame_unwind * 208kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 209{ 210#ifndef CROSS_DEBUGGER 211 char *pname; 212 CORE_ADDR pc; 213 214 pc = frame_pc_unwind(next_frame); 215 pname = NULL; 216 find_pc_partial_function(pc, &pname, NULL, NULL); 217 if (pname == NULL) { 218 is_undef = 0; 219 return (NULL); 220 } 221 if (!strcmp(pname, "undefinedinstruction")) 222 is_undef = 1; 223 if (strcmp(pname, "Laddress_exception_entry") == 0 || 224 strcmp(pname, "undefined_entry") == 0 || 225 strcmp(pname, "exception_exit") == 0 || 226 strcmp(pname, "Laddress_exception_msg") == 0 || 227 strcmp(pname, "irq_entry") == 0) 228 return (&kgdb_trgt_trapframe_unwind); 229 if (!strcmp(pname, "undefinedinstruction")) 230 is_undef = 1; 231 else 232 is_undef = 0; 233#endif 234 return (NULL); 235} 236