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: releng/11.0/gnu/usr.bin/gdb/kgdb/trgt_amd64.c 298363 2016-04-20 20:22:48Z wma $"); 29 30#include <sys/types.h> 31#include <machine/pcb.h> 32#include <machine/frame.h> 33#include <err.h> 34#include <kvm.h> 35#include <string.h> 36 37#include <defs.h> 38#include <target.h> 39#include <gdbthread.h> 40#include <inferior.h> 41#include <regcache.h> 42#include <frame-unwind.h> 43#include <amd64-tdep.h> 44 45#include "kgdb.h" 46 47CORE_ADDR 48kgdb_trgt_core_pcb(u_int cpuid) 49{ 50 return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb))); 51} 52 53void 54kgdb_trgt_fetch_registers(int regno __unused) 55{ 56 struct kthr *kt; 57 struct pcb pcb; 58 59 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid)); 60 if (kt == NULL) 61 return; 62 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) { 63 warnx("kvm_read: %s", kvm_geterr(kvm)); 64 memset(&pcb, 0, sizeof(pcb)); 65 } 66 67 supply_register(AMD64_RBX_REGNUM, (char *)&pcb.pcb_rbx); 68 supply_register(AMD64_RBP_REGNUM, (char *)&pcb.pcb_rbp); 69 supply_register(AMD64_RSP_REGNUM, (char *)&pcb.pcb_rsp); 70 supply_register(AMD64_R8_REGNUM + 4, (char *)&pcb.pcb_r12); 71 supply_register(AMD64_R8_REGNUM + 5, (char *)&pcb.pcb_r13); 72 supply_register(AMD64_R8_REGNUM + 6, (char *)&pcb.pcb_r14); 73 supply_register(AMD64_R15_REGNUM, (char *)&pcb.pcb_r15); 74 supply_register(AMD64_RIP_REGNUM, (char *)&pcb.pcb_rip); 75} 76 77void 78kgdb_trgt_store_registers(int regno __unused) 79{ 80 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 81} 82 83void 84kgdb_trgt_new_objfile(struct objfile *objfile) 85{ 86} 87 88struct kgdb_frame_cache { 89 CORE_ADDR pc; 90 CORE_ADDR sp; 91}; 92 93static int kgdb_trgt_frame_offset[20] = { 94 offsetof(struct trapframe, tf_rax), 95 offsetof(struct trapframe, tf_rbx), 96 offsetof(struct trapframe, tf_rcx), 97 offsetof(struct trapframe, tf_rdx), 98 offsetof(struct trapframe, tf_rsi), 99 offsetof(struct trapframe, tf_rdi), 100 offsetof(struct trapframe, tf_rbp), 101 offsetof(struct trapframe, tf_rsp), 102 offsetof(struct trapframe, tf_r8), 103 offsetof(struct trapframe, tf_r9), 104 offsetof(struct trapframe, tf_r10), 105 offsetof(struct trapframe, tf_r11), 106 offsetof(struct trapframe, tf_r12), 107 offsetof(struct trapframe, tf_r13), 108 offsetof(struct trapframe, tf_r14), 109 offsetof(struct trapframe, tf_r15), 110 offsetof(struct trapframe, tf_rip), 111 offsetof(struct trapframe, tf_rflags), 112 offsetof(struct trapframe, tf_cs), 113 offsetof(struct trapframe, tf_ss) 114}; 115 116static struct kgdb_frame_cache * 117kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 118{ 119 char buf[MAX_REGISTER_SIZE]; 120 struct kgdb_frame_cache *cache; 121 122 cache = *this_cache; 123 if (cache == NULL) { 124 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 125 *this_cache = cache; 126 cache->pc = frame_func_unwind(next_frame); 127 frame_unwind_register(next_frame, SP_REGNUM, buf); 128 cache->sp = extract_unsigned_integer(buf, 129 register_size(current_gdbarch, SP_REGNUM)); 130 } 131 return (cache); 132} 133 134static void 135kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 136 struct frame_id *this_id) 137{ 138 struct kgdb_frame_cache *cache; 139 140 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 141 *this_id = frame_id_build(cache->sp, cache->pc); 142} 143 144static void 145kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 146 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 147 CORE_ADDR *addrp, int *realnump, void *valuep) 148{ 149 char dummy_valuep[MAX_REGISTER_SIZE]; 150 struct kgdb_frame_cache *cache; 151 int ofs, regsz; 152 153 regsz = register_size(current_gdbarch, regnum); 154 155 if (valuep == NULL) 156 valuep = dummy_valuep; 157 memset(valuep, 0, regsz); 158 *optimizedp = 0; 159 *addrp = 0; 160 *lvalp = not_lval; 161 *realnump = -1; 162 163 ofs = (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_EFLAGS_REGNUM + 2) 164 ? kgdb_trgt_frame_offset[regnum] : -1; 165 if (ofs == -1) 166 return; 167 168 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 169 *addrp = cache->sp + ofs; 170 *lvalp = lval_memory; 171 target_read_memory(*addrp, valuep, regsz); 172} 173 174static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 175 UNKNOWN_FRAME, 176 &kgdb_trgt_trapframe_this_id, 177 &kgdb_trgt_trapframe_prev_register 178}; 179 180const struct frame_unwind * 181kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 182{ 183 char *pname; 184 CORE_ADDR pc; 185 186 pc = frame_pc_unwind(next_frame); 187 pname = NULL; 188 find_pc_partial_function(pc, &pname, NULL, NULL); 189 if (pname == NULL) 190 return (NULL); 191 if (strcmp(pname, "calltrap") == 0 || 192 strcmp(pname, "nmi_calltrap") == 0 || 193 (pname[0] == 'X' && pname[1] != '_')) 194 return (&kgdb_trgt_trapframe_unwind); 195 /* printf("%s: %lx =%s\n", __func__, pc, pname); */ 196 return (NULL); 197} 198 199/* 200 * This function ensures, that the PC is inside the 201 * function section which is understood by GDB. 202 * 203 * Return 0 when fixup is necessary, -1 otherwise. 204 */ 205int 206kgdb_trgt_pc_fixup(CORE_ADDR *pc __unused) 207{ 208 209 return (-1); 210} 211