| 1 | /* |
| 2 | * Copyright (c) 1983, 1993, 2001 |
| 3 | * The Regents of the University of California. 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 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. Neither the name of the University nor the names of its contributors |
| 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | #include "gprof.h" |
| 30 | #include "search_list.h" |
| 31 | #include "source.h" |
| 32 | #include "symtab.h" |
| 33 | #include "cg_arcs.h" |
| 34 | #include "corefile.h" |
| 35 | #include "hist.h" |
| 36 | |
| 37 | /* |
| 38 | * opcode of the `calls' instruction |
| 39 | */ |
| 40 | #define CALLS 0xfb |
| 41 | |
| 42 | /* |
| 43 | * register for pc relative addressing |
| 44 | */ |
| 45 | #define PC 0xf |
| 46 | |
| 47 | enum opermodes |
| 48 | { |
| 49 | literal, indexed, reg, regdef, autodec, autoinc, autoincdef, |
| 50 | bytedisp, bytedispdef, worddisp, worddispdef, longdisp, longdispdef, |
| 51 | immediate, absolute, byterel, bytereldef, wordrel, wordreldef, |
| 52 | longrel, longreldef |
| 53 | }; |
| 54 | typedef enum opermodes operandenum; |
| 55 | |
| 56 | /* *INDENT-OFF* */ |
| 57 | /* Here to document only. We can't use this when cross compiling as |
| 58 | the bitfield layout might not be the same as native. |
| 59 | |
| 60 | struct modebyte |
| 61 | { |
| 62 | unsigned int regfield:4; |
| 63 | unsigned int modefield:4; |
| 64 | }; |
| 65 | */ |
| 66 | /* *INDENT-ON* */ |
| 67 | |
| 68 | /* |
| 69 | * A symbol to be the child of indirect calls: |
| 70 | */ |
| 71 | static Sym indirectchild; |
| 72 | |
| 73 | static operandenum vax_operandmode (unsigned char *); |
| 74 | static char *vax_operandname (operandenum); |
| 75 | static long vax_operandlength (unsigned char *); |
| 76 | static bfd_signed_vma vax_offset (unsigned char *); |
| 77 | void vax_find_call (Sym *, bfd_vma, bfd_vma); |
| 78 | |
| 79 | static operandenum |
| 80 | vax_operandmode (unsigned char *modep) |
| 81 | { |
| 82 | int usesreg = *modep & 0xf; |
| 83 | |
| 84 | switch ((*modep >> 4) & 0xf) |
| 85 | { |
| 86 | case 0: |
| 87 | case 1: |
| 88 | case 2: |
| 89 | case 3: |
| 90 | return literal; |
| 91 | case 4: |
| 92 | return indexed; |
| 93 | case 5: |
| 94 | return reg; |
| 95 | case 6: |
| 96 | return regdef; |
| 97 | case 7: |
| 98 | return autodec; |
| 99 | case 8: |
| 100 | return usesreg != PC ? autoinc : immediate; |
| 101 | case 9: |
| 102 | return usesreg != PC ? autoincdef : absolute; |
| 103 | case 10: |
| 104 | return usesreg != PC ? bytedisp : byterel; |
| 105 | case 11: |
| 106 | return usesreg != PC ? bytedispdef : bytereldef; |
| 107 | case 12: |
| 108 | return usesreg != PC ? worddisp : wordrel; |
| 109 | case 13: |
| 110 | return usesreg != PC ? worddispdef : wordreldef; |
| 111 | case 14: |
| 112 | return usesreg != PC ? longdisp : longrel; |
| 113 | case 15: |
| 114 | return usesreg != PC ? longdispdef : longreldef; |
| 115 | } |
| 116 | /* NOTREACHED */ |
| 117 | abort (); |
| 118 | } |
| 119 | |
| 120 | static char * |
| 121 | vax_operandname (operandenum mode) |
| 122 | { |
| 123 | |
| 124 | switch (mode) |
| 125 | { |
| 126 | case literal: |
| 127 | return "literal"; |
| 128 | case indexed: |
| 129 | return "indexed"; |
| 130 | case reg: |
| 131 | return "register"; |
| 132 | case regdef: |
| 133 | return "register deferred"; |
| 134 | case autodec: |
| 135 | return "autodecrement"; |
| 136 | case autoinc: |
| 137 | return "autoincrement"; |
| 138 | case autoincdef: |
| 139 | return "autoincrement deferred"; |
| 140 | case bytedisp: |
| 141 | return "byte displacement"; |
| 142 | case bytedispdef: |
| 143 | return "byte displacement deferred"; |
| 144 | case byterel: |
| 145 | return "byte relative"; |
| 146 | case bytereldef: |
| 147 | return "byte relative deferred"; |
| 148 | case worddisp: |
| 149 | return "word displacement"; |
| 150 | case worddispdef: |
| 151 | return "word displacement deferred"; |
| 152 | case wordrel: |
| 153 | return "word relative"; |
| 154 | case wordreldef: |
| 155 | return "word relative deferred"; |
| 156 | case immediate: |
| 157 | return "immediate"; |
| 158 | case absolute: |
| 159 | return "absolute"; |
| 160 | case longdisp: |
| 161 | return "long displacement"; |
| 162 | case longdispdef: |
| 163 | return "long displacement deferred"; |
| 164 | case longrel: |
| 165 | return "long relative"; |
| 166 | case longreldef: |
| 167 | return "long relative deferred"; |
| 168 | } |
| 169 | /* NOTREACHED */ |
| 170 | abort (); |
| 171 | } |
| 172 | |
| 173 | static long |
| 174 | vax_operandlength (unsigned char *modep) |
| 175 | { |
| 176 | |
| 177 | switch (vax_operandmode (modep)) |
| 178 | { |
| 179 | case literal: |
| 180 | case reg: |
| 181 | case regdef: |
| 182 | case autodec: |
| 183 | case autoinc: |
| 184 | case autoincdef: |
| 185 | return 1; |
| 186 | case bytedisp: |
| 187 | case bytedispdef: |
| 188 | case byterel: |
| 189 | case bytereldef: |
| 190 | return 2; |
| 191 | case worddisp: |
| 192 | case worddispdef: |
| 193 | case wordrel: |
| 194 | case wordreldef: |
| 195 | return 3; |
| 196 | case immediate: |
| 197 | case absolute: |
| 198 | case longdisp: |
| 199 | case longdispdef: |
| 200 | case longrel: |
| 201 | case longreldef: |
| 202 | return 5; |
| 203 | case indexed: |
| 204 | return 1 + vax_operandlength (modep + 1); |
| 205 | } |
| 206 | /* NOTREACHED */ |
| 207 | abort (); |
| 208 | } |
| 209 | |
| 210 | static bfd_signed_vma |
| 211 | vax_offset (unsigned char *modep) |
| 212 | { |
| 213 | operandenum mode = vax_operandmode (modep); |
| 214 | |
| 215 | ++modep; /* skip over the mode */ |
| 216 | switch (mode) |
| 217 | { |
| 218 | default: |
| 219 | fprintf (stderr, "[reladdr] not relative address\n"); |
| 220 | return 0; |
| 221 | case byterel: |
| 222 | return 1 + bfd_get_signed_8 (core_bfd, modep); |
| 223 | case wordrel: |
| 224 | return 2 + bfd_get_signed_16 (core_bfd, modep); |
| 225 | case longrel: |
| 226 | return 4 + bfd_get_signed_32 (core_bfd, modep); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | |
| 231 | void |
| 232 | vax_find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc) |
| 233 | { |
| 234 | unsigned char *instructp; |
| 235 | long length; |
| 236 | Sym *child; |
| 237 | operandenum mode; |
| 238 | operandenum firstmode; |
| 239 | bfd_vma pc, destpc; |
| 240 | static bfd_boolean inited = FALSE; |
| 241 | |
| 242 | if (!inited) |
| 243 | { |
| 244 | inited = TRUE; |
| 245 | sym_init (&indirectchild); |
| 246 | indirectchild.cg.prop.fract = 1.0; |
| 247 | indirectchild.cg.cyc.head = &indirectchild; |
| 248 | } |
| 249 | |
| 250 | DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n", |
| 251 | parent->name, (unsigned long) p_lowpc, |
| 252 | (unsigned long) p_highpc)); |
| 253 | for (pc = p_lowpc; pc < p_highpc; pc += length) |
| 254 | { |
| 255 | length = 1; |
| 256 | instructp = ((unsigned char *) core_text_space |
| 257 | + pc - core_text_sect->vma); |
| 258 | if ((*instructp & 0xff) == CALLS) |
| 259 | { |
| 260 | /* |
| 261 | * maybe a calls, better check it out. |
| 262 | * skip the count of the number of arguments. |
| 263 | */ |
| 264 | DBG (CALLDEBUG, |
| 265 | printf ("[findcall]\t0x%lx:calls", (unsigned long) pc)); |
| 266 | firstmode = vax_operandmode (instructp + length); |
| 267 | switch (firstmode) |
| 268 | { |
| 269 | case literal: |
| 270 | case immediate: |
| 271 | break; |
| 272 | default: |
| 273 | goto botched; |
| 274 | } |
| 275 | length += vax_operandlength (instructp + length); |
| 276 | mode = vax_operandmode (instructp + length); |
| 277 | DBG (CALLDEBUG, |
| 278 | printf ("\tfirst operand is %s", vax_operandname (firstmode)); |
| 279 | printf ("\tsecond operand is %s\n", vax_operandname (mode))); |
| 280 | switch (mode) |
| 281 | { |
| 282 | case regdef: |
| 283 | case bytedispdef: |
| 284 | case worddispdef: |
| 285 | case longdispdef: |
| 286 | case bytereldef: |
| 287 | case wordreldef: |
| 288 | case longreldef: |
| 289 | /* |
| 290 | * indirect call: call through pointer |
| 291 | * either *d(r) as a parameter or local |
| 292 | * (r) as a return value |
| 293 | * *f as a global pointer |
| 294 | * [are there others that we miss?, |
| 295 | * e.g. arrays of pointers to functions???] |
| 296 | */ |
| 297 | arc_add (parent, &indirectchild, (unsigned long) 0); |
| 298 | length += vax_operandlength (instructp + length); |
| 299 | continue; |
| 300 | case byterel: |
| 301 | case wordrel: |
| 302 | case longrel: |
| 303 | /* |
| 304 | * regular pc relative addressing |
| 305 | * check that this is the address of |
| 306 | * a function. |
| 307 | */ |
| 308 | destpc = pc + vax_offset (instructp + length); |
| 309 | if (hist_check_address (destpc)) |
| 310 | { |
| 311 | child = sym_lookup (&symtab, destpc); |
| 312 | DBG (CALLDEBUG, |
| 313 | printf ("[findcall]\tdestpc 0x%lx", |
| 314 | (unsigned long) destpc); |
| 315 | printf (" child->name %s", child->name); |
| 316 | printf (" child->addr 0x%lx\n", |
| 317 | (unsigned long) child->addr); |
| 318 | ); |
| 319 | if (child->addr == destpc) |
| 320 | { |
| 321 | /* |
| 322 | * a hit |
| 323 | */ |
| 324 | arc_add (parent, child, (unsigned long) 0); |
| 325 | length += vax_operandlength (instructp + length); |
| 326 | continue; |
| 327 | } |
| 328 | goto botched; |
| 329 | } |
| 330 | /* |
| 331 | * else: |
| 332 | * it looked like a calls, |
| 333 | * but it wasn't to anywhere. |
| 334 | */ |
| 335 | goto botched; |
| 336 | default: |
| 337 | botched: |
| 338 | /* |
| 339 | * something funny going on. |
| 340 | */ |
| 341 | DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n")); |
| 342 | length = 1; |
| 343 | continue; |
| 344 | } |
| 345 | } |
| 346 | } |
| 347 | } |