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: releng/11.0/gnu/usr.bin/gdb/kgdb/trgt_powerpc.c 298363 2016-04-20 20:22:48Z wma $"); 29 30#include <sys/types.h> 31#ifdef CROSS_DEBUGGER 32#include <sys/powerpc/include/pcb.h> 33#include <sys/powerpc/include/frame.h> 34#else 35#include <machine/pcb.h> 36#include <machine/frame.h> 37#endif 38#include <err.h> 39#include <kvm.h> 40#include <string.h> 41 42#include <defs.h> 43#include <target.h> 44#include <gdbthread.h> 45#include <inferior.h> 46#include <regcache.h> 47#include <frame-unwind.h> 48#include <ppc-tdep.h> 49 50#include "kgdb.h" 51 52CORE_ADDR 53kgdb_trgt_core_pcb(u_int cpuid) 54{ 55 return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb))); 56} 57 58void 59kgdb_trgt_fetch_registers(int regno __unused) 60{ 61 struct kthr *kt; 62 struct pcb pcb; 63 struct gdbarch_tdep *tdep; 64 int i; 65 66 tdep = gdbarch_tdep (current_gdbarch); 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 76 /* 77 * r14-r31 are saved in the pcb 78 */ 79 for (i = 14; i <= 31; i++) { 80 supply_register(tdep->ppc_gp0_regnum + i, 81 (char *)&pcb.pcb_context[i]); 82 } 83 84 /* r1 is saved in the sp field */ 85 supply_register(tdep->ppc_gp0_regnum + 1, (char *)&pcb.pcb_sp); 86 87 supply_register(tdep->ppc_lr_regnum, (char *)&pcb.pcb_lr); 88 supply_register(tdep->ppc_cr_regnum, (char *)&pcb.pcb_cr); 89} 90 91void 92kgdb_trgt_store_registers(int regno __unused) 93{ 94 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__); 95} 96 97void 98kgdb_trgt_new_objfile(struct objfile *objfile) 99{ 100} 101 102struct kgdb_frame_cache { 103 CORE_ADDR pc; 104 CORE_ADDR sp; 105}; 106 107static struct kgdb_frame_cache * 108kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache) 109{ 110 char buf[MAX_REGISTER_SIZE]; 111 struct kgdb_frame_cache *cache; 112 113 cache = *this_cache; 114 if (cache == NULL) { 115 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache); 116 *this_cache = cache; 117 cache->pc = frame_func_unwind(next_frame); 118 frame_unwind_register(next_frame, SP_REGNUM, buf); 119 cache->sp = extract_unsigned_integer(buf, 120 register_size(current_gdbarch, SP_REGNUM)); 121 } 122 return (cache); 123} 124 125static void 126kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache, 127 struct frame_id *this_id) 128{ 129 struct kgdb_frame_cache *cache; 130 131 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 132 *this_id = frame_id_build(cache->sp, cache->pc); 133} 134 135static void 136kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame, 137 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, 138 CORE_ADDR *addrp, int *realnump, void *valuep) 139{ 140 char dummy_valuep[MAX_REGISTER_SIZE]; 141 struct gdbarch_tdep *tdep; 142 struct kgdb_frame_cache *cache; 143 int ofs, regsz; 144 145 tdep = gdbarch_tdep(current_gdbarch); 146 regsz = register_size(current_gdbarch, regnum); 147 148 if (valuep == NULL) 149 valuep = dummy_valuep; 150 memset(valuep, 0, regsz); 151 *optimizedp = 0; 152 *addrp = 0; 153 *lvalp = not_lval; 154 *realnump = -1; 155 156 if (regnum >= tdep->ppc_gp0_regnum && 157 regnum <= tdep->ppc_gplast_regnum) 158 ofs = offsetof(struct trapframe, 159 fixreg[regnum - tdep->ppc_gp0_regnum]); 160 else if (regnum == tdep->ppc_lr_regnum) 161 ofs = offsetof(struct trapframe, lr); 162 else if (regnum == tdep->ppc_cr_regnum) 163 ofs = offsetof(struct trapframe, cr); 164 else if (regnum == tdep->ppc_xer_regnum) 165 ofs = offsetof(struct trapframe, xer); 166 else if (regnum == tdep->ppc_ctr_regnum) 167 ofs = offsetof(struct trapframe, ctr); 168 else if (regnum == PC_REGNUM) 169 ofs = offsetof(struct trapframe, srr0); 170 else 171 return; 172 173 cache = kgdb_trgt_frame_cache(next_frame, this_cache); 174 *addrp = cache->sp + 8 + ofs; 175 *lvalp = lval_memory; 176 target_read_memory(*addrp, valuep, regsz); 177} 178 179static const struct frame_unwind kgdb_trgt_trapframe_unwind = { 180 UNKNOWN_FRAME, 181 &kgdb_trgt_trapframe_this_id, 182 &kgdb_trgt_trapframe_prev_register 183}; 184 185const struct frame_unwind * 186kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame) 187{ 188 char *pname; 189 CORE_ADDR pc; 190 191 pc = frame_pc_unwind(next_frame); 192 pname = NULL; 193 find_pc_partial_function(pc, &pname, NULL, NULL); 194 if (pname == NULL) 195 return (NULL); 196 if (strcmp(pname, "asttrapexit") == 0 || 197 strcmp(pname, "trapexit") == 0) 198 return (&kgdb_trgt_trapframe_unwind); 199 /* printf("%s: %llx =%s\n", __func__, pc, pname); */ 200 return (NULL); 201} 202 203/* 204 * This function ensures, that the PC is inside the 205 * function section which is understood by GDB. 206 * 207 * Return 0 when fixup is necessary, -1 otherwise. 208 */ 209int 210kgdb_trgt_pc_fixup(CORE_ADDR *pc __unused) 211{ 212 213 return (-1); 214} 215