1/*- 2 * Copyright (c) 2006 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 AUTHOR ``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 AUTHOR 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("$FreeBSD$"); 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 <ppc-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 struct gdbarch_tdep *tdep; 59 int i; 60 61 tdep = gdbarch_tdep (current_gdbarch); 62 63 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid)); 64 if (kt == NULL) 65 return; 66 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) { 67 warnx("kvm_read: %s", kvm_geterr(kvm)); 68 memset(&pcb, 0, sizeof(pcb)); 69 } 70 71 /* 72 * r14-r31 are saved in the pcb 73 */ 74 for (i = 14; i <= 31; i++) { 75 supply_register(tdep->ppc_gp0_regnum + i, 76 (char *)&pcb.pcb_context[i]); 77 } 78 79 /* r1 is saved in the sp field */ 80 supply_register(tdep->ppc_gp0_regnum + 1, (char *)&pcb.pcb_sp); 81 /* r2 is saved in the toc field */ 82 supply_register(tdep->ppc_gp0_regnum + 2, (char *)&pcb.pcb_toc); 83 84 supply_register(tdep->ppc_lr_regnum, (char *)&pcb.pcb_lr); 85 supply_register(tdep->ppc_cr_regnum, (char *)&pcb.pcb_cr); 86} 87 88void 89kgdb_trgt_store_registers(int regno __unused) 90{ 91 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 92} 93 94void 95kgdb_trgt_new_objfile(struct objfile *objfile) 96{ 97} 98 99struct kgdb_frame_cache { 100 CORE_ADDR pc; 101 CORE_ADDR sp; 102}; 103 104static struct kgdb_frame_cache * 105kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 106{ 107 char buf[MAX_REGISTER_SIZE]; 108 struct kgdb_frame_cache *cache; 109 110 cache = *this_cache; 111 if (cache == NULL) { 112 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 113 *this_cache = cache; 114 cache->pc = frame_func_unwind(next_frame); 115 frame_unwind_register(next_frame, SP_REGNUM, buf); 116 cache->sp = extract_unsigned_integer(buf, 117 register_size(current_gdbarch, SP_REGNUM)); 118 } 119 return (cache); 120} 121 122static void 123kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 124 struct frame_id *this_id) 125{ 126 struct kgdb_frame_cache *cache; 127 128 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 129 *this_id = frame_id_build(cache->sp, cache->pc); 130} 131 132static void 133kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 134 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 135 CORE_ADDR *addrp, int *realnump, void *valuep) 136{ 137 char dummy_valuep[MAX_REGISTER_SIZE]; 138 struct gdbarch_tdep *tdep; 139 struct kgdb_frame_cache *cache; 140 int ofs, regsz; 141 142 tdep = gdbarch_tdep(current_gdbarch); 143 regsz = register_size(current_gdbarch, regnum); 144 145 if (valuep == NULL) 146 valuep = dummy_valuep; 147 memset(valuep, 0, regsz); 148 *optimizedp = 0; 149 *addrp = 0; 150 *lvalp = not_lval; 151 *realnump = -1; 152 153 if (regnum >= tdep->ppc_gp0_regnum && 154 regnum <= tdep->ppc_gplast_regnum) 155 ofs = offsetof(struct trapframe, 156 fixreg[regnum - tdep->ppc_gp0_regnum]); 157 else if (regnum == tdep->ppc_lr_regnum) 158 ofs = offsetof(struct trapframe, lr); 159 else if (regnum == tdep->ppc_cr_regnum) 160 ofs = offsetof(struct trapframe, cr); 161 else if (regnum == tdep->ppc_xer_regnum) 162 ofs = offsetof(struct trapframe, xer); 163 else if (regnum == tdep->ppc_ctr_regnum) 164 ofs = offsetof(struct trapframe, ctr); 165 else if (regnum == PC_REGNUM) 166 ofs = offsetof(struct trapframe, srr0); 167 else 168 return; 169 170 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 171 *addrp = cache->sp + 48 + ofs; 172 *lvalp = lval_memory; 173 target_read_memory(*addrp, valuep, regsz); 174} 175 176static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 177 UNKNOWN_FRAME, 178 &kgdb_trgt_trapframe_this_id, 179 &kgdb_trgt_trapframe_prev_register 180}; 181 182const struct frame_unwind * 183kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 184{ 185 char *pname; 186 CORE_ADDR pc; 187 188 pc = frame_pc_unwind(next_frame); 189 pname = NULL; 190 find_pc_partial_function(pc, &pname, NULL, NULL); 191 if (pname == NULL) 192 return (NULL); 193 if (strcmp(pname, "asttrapexit") == 0 || 194 strcmp(pname, "trapexit") == 0) 195 return (&kgdb_trgt_trapframe_unwind); 196 /* printf("%s: %llx =%s\n", __func__, pc, pname); */ 197 return (NULL); 198} 199