| 1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms are permitted |
| 6 | * provided that: (1) source distributions retain this entire copyright |
| 7 | * notice and comment, and (2) distributions including binaries display |
| 8 | * the following acknowledgement: ``This product includes software |
| 9 | * developed by the University of California, Berkeley and its contributors'' |
| 10 | * in the documentation or other materials provided with the distribution |
| 11 | * and in all advertising materials mentioning features or use of this |
| 12 | * software. Neither the name of the University nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 17 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 18 | */ |
| 19 | #include "gprof.h" |
| 20 | #include "cg_arcs.h" |
| 21 | #include "core.h" |
| 22 | #include "hist.h" |
| 23 | #include "symtab.h" |
| 24 | |
| 25 | /* |
| 26 | * A symbol to be the child of indirect calls: |
| 27 | */ |
| 28 | Sym indirectchild; |
| 29 | |
| 30 | |
| 31 | static operandenum |
| 32 | operandmode (modep) |
| 33 | struct modebyte *modep; |
| 34 | { |
| 35 | long usesreg = modep->regfield; |
| 36 | |
| 37 | switch (modep->modefield) |
| 38 | { |
| 39 | case 0: |
| 40 | case 1: |
| 41 | case 2: |
| 42 | case 3: |
| 43 | return literal; |
| 44 | case 4: |
| 45 | return indexed; |
| 46 | case 5: |
| 47 | return reg; |
| 48 | case 6: |
| 49 | return regdef; |
| 50 | case 7: |
| 51 | return autodec; |
| 52 | case 8: |
| 53 | return usesreg != PC ? autoinc : immediate; |
| 54 | case 9: |
| 55 | return usesreg != PC ? autoincdef : absolute; |
| 56 | case 10: |
| 57 | return usesreg != PC ? bytedisp : byterel; |
| 58 | case 11: |
| 59 | return usesreg != PC ? bytedispdef : bytereldef; |
| 60 | case 12: |
| 61 | return usesreg != PC ? worddisp : wordrel; |
| 62 | case 13: |
| 63 | return usesreg != PC ? worddispdef : wordreldef; |
| 64 | case 14: |
| 65 | return usesreg != PC ? longdisp : longrel; |
| 66 | case 15: |
| 67 | return usesreg != PC ? longdispdef : longreldef; |
| 68 | } |
| 69 | /* NOTREACHED */ |
| 70 | } |
| 71 | |
| 72 | static char * |
| 73 | operandname (mode) |
| 74 | operandenum mode; |
| 75 | { |
| 76 | |
| 77 | switch (mode) |
| 78 | { |
| 79 | case literal: |
| 80 | return "literal"; |
| 81 | case indexed: |
| 82 | return "indexed"; |
| 83 | case reg: |
| 84 | return "register"; |
| 85 | case regdef: |
| 86 | return "register deferred"; |
| 87 | case autodec: |
| 88 | return "autodecrement"; |
| 89 | case autoinc: |
| 90 | return "autoincrement"; |
| 91 | case autoincdef: |
| 92 | return "autoincrement deferred"; |
| 93 | case bytedisp: |
| 94 | return "byte displacement"; |
| 95 | case bytedispdef: |
| 96 | return "byte displacement deferred"; |
| 97 | case byterel: |
| 98 | return "byte relative"; |
| 99 | case bytereldef: |
| 100 | return "byte relative deferred"; |
| 101 | case worddisp: |
| 102 | return "word displacement"; |
| 103 | case worddispdef: |
| 104 | return "word displacement deferred"; |
| 105 | case wordrel: |
| 106 | return "word relative"; |
| 107 | case wordreldef: |
| 108 | return "word relative deferred"; |
| 109 | case immediate: |
| 110 | return "immediate"; |
| 111 | case absolute: |
| 112 | return "absolute"; |
| 113 | case longdisp: |
| 114 | return "long displacement"; |
| 115 | case longdispdef: |
| 116 | return "long displacement deferred"; |
| 117 | case longrel: |
| 118 | return "long relative"; |
| 119 | case longreldef: |
| 120 | return "long relative deferred"; |
| 121 | } |
| 122 | /* NOTREACHED */ |
| 123 | } |
| 124 | |
| 125 | static long |
| 126 | operandlength (modep) |
| 127 | struct modebyte *modep; |
| 128 | { |
| 129 | |
| 130 | switch (operandmode (modep)) |
| 131 | { |
| 132 | case literal: |
| 133 | case reg: |
| 134 | case regdef: |
| 135 | case autodec: |
| 136 | case autoinc: |
| 137 | case autoincdef: |
| 138 | return 1; |
| 139 | case bytedisp: |
| 140 | case bytedispdef: |
| 141 | case byterel: |
| 142 | case bytereldef: |
| 143 | return 2; |
| 144 | case worddisp: |
| 145 | case worddispdef: |
| 146 | case wordrel: |
| 147 | case wordreldef: |
| 148 | return 3; |
| 149 | case immediate: |
| 150 | case absolute: |
| 151 | case longdisp: |
| 152 | case longdispdef: |
| 153 | case longrel: |
| 154 | case longreldef: |
| 155 | return 5; |
| 156 | case indexed: |
| 157 | return 1 + operandlength ((struct modebyte *) ((char *) modep) + 1); |
| 158 | } |
| 159 | /* NOTREACHED */ |
| 160 | } |
| 161 | |
| 162 | static bfd_vma |
| 163 | reladdr (modep) |
| 164 | struct modebyte *modep; |
| 165 | { |
| 166 | operandenum mode = operandmode (modep); |
| 167 | char *cp; |
| 168 | short *sp; |
| 169 | long *lp; |
| 170 | |
| 171 | cp = (char *) modep; |
| 172 | ++cp; /* skip over the mode */ |
| 173 | switch (mode) |
| 174 | { |
| 175 | default: |
| 176 | fprintf (stderr, "[reladdr] not relative address\n"); |
| 177 | return (bfd_vma) modep; |
| 178 | case byterel: |
| 179 | return (bfd_vma) (cp + sizeof *cp + *cp); |
| 180 | case wordrel: |
| 181 | sp = (short *) cp; |
| 182 | return (bfd_vma) (cp + sizeof *sp + *sp); |
| 183 | case longrel: |
| 184 | lp = (long *) cp; |
| 185 | return (bfd_vma) (cp + sizeof *lp + *lp); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | |
| 190 | void |
| 191 | find_call (parent, p_lowpc, p_highpc) |
| 192 | Sym *parent; |
| 193 | bfd_vma p_lowpc; |
| 194 | bfd_vma p_highpc; |
| 195 | { |
| 196 | unsigned char *instructp; |
| 197 | long length; |
| 198 | Sym *child; |
| 199 | operandenum mode; |
| 200 | operandenum firstmode; |
| 201 | bfd_vma destpc; |
| 202 | static bool inited = FALSE; |
| 203 | |
| 204 | if (!inited) |
| 205 | { |
| 206 | inited = TRUE; |
| 207 | sym_init (&indirectchild); |
| 208 | indirectchild.cg.prop.fract = 1.0; |
| 209 | indirectchild.cg.cyc.head = &indirectchild; |
| 210 | } |
| 211 | |
| 212 | if (core_text_space == 0) |
| 213 | { |
| 214 | return; |
| 215 | } |
| 216 | if (p_lowpc < s_lowpc) |
| 217 | { |
| 218 | p_lowpc = s_lowpc; |
| 219 | } |
| 220 | if (p_highpc > s_highpc) |
| 221 | { |
| 222 | p_highpc = s_highpc; |
| 223 | } |
| 224 | DBG (CALLDEBUG, printf ("[findcall] %s: 0x%lx to 0x%lx\n", |
| 225 | parent->name, p_lowpc, p_highpc)); |
| 226 | for (instructp = (unsigned char *) core_text_space + p_lowpc; |
| 227 | instructp < (unsigned char *) core_text_space + p_highpc; |
| 228 | instructp += length) |
| 229 | { |
| 230 | length = 1; |
| 231 | if (*instructp == CALLS) |
| 232 | { |
| 233 | /* |
| 234 | * maybe a calls, better check it out. |
| 235 | * skip the count of the number of arguments. |
| 236 | */ |
| 237 | DBG (CALLDEBUG, |
| 238 | printf ("[findcall]\t0x%x:calls", |
| 239 | instructp - (unsigned char *) core_text_space)); |
| 240 | firstmode = operandmode ((struct modebyte *) (instructp + length)); |
| 241 | switch (firstmode) |
| 242 | { |
| 243 | case literal: |
| 244 | case immediate: |
| 245 | break; |
| 246 | default: |
| 247 | goto botched; |
| 248 | } |
| 249 | length += operandlength ((struct modebyte *) (instructp + length)); |
| 250 | mode = operandmode ((struct modebyte *) (instructp + length)); |
| 251 | DBG (CALLDEBUG, |
| 252 | printf ("\tfirst operand is %s", operandname (firstmode)); |
| 253 | printf ("\tsecond operand is %s\n", operandname (mode))); |
| 254 | switch (mode) |
| 255 | { |
| 256 | case regdef: |
| 257 | case bytedispdef: |
| 258 | case worddispdef: |
| 259 | case longdispdef: |
| 260 | case bytereldef: |
| 261 | case wordreldef: |
| 262 | case longreldef: |
| 263 | /* |
| 264 | * indirect call: call through pointer |
| 265 | * either *d(r) as a parameter or local |
| 266 | * (r) as a return value |
| 267 | * *f as a global pointer |
| 268 | * [are there others that we miss?, |
| 269 | * e.g. arrays of pointers to functions???] |
| 270 | */ |
| 271 | arc_add (parent, &indirectchild, (long) 0); |
| 272 | length += operandlength ( |
| 273 | (struct modebyte *) (instructp + length)); |
| 274 | continue; |
| 275 | case byterel: |
| 276 | case wordrel: |
| 277 | case longrel: |
| 278 | /* |
| 279 | * regular pc relative addressing |
| 280 | * check that this is the address of |
| 281 | * a function. |
| 282 | */ |
| 283 | destpc = reladdr ((struct modebyte *) (instructp + length)) |
| 284 | - (bfd_vma) core_text_space; |
| 285 | if (destpc >= s_lowpc && destpc <= s_highpc) |
| 286 | { |
| 287 | child = sym_lookup (&symtab, destpc); |
| 288 | DBG (CALLDEBUG, |
| 289 | printf ("[findcall]\tdestpc 0x%lx", destpc); |
| 290 | printf (" child->name %s", child->name); |
| 291 | printf (" child->addr 0x%lx\n", child->addr); |
| 292 | ); |
| 293 | if (child->addr == destpc) |
| 294 | { |
| 295 | /* |
| 296 | * a hit |
| 297 | */ |
| 298 | arc_add (parent, child, (long) 0); |
| 299 | length += operandlength ((struct modebyte *) |
| 300 | (instructp + length)); |
| 301 | continue; |
| 302 | } |
| 303 | goto botched; |
| 304 | } |
| 305 | /* |
| 306 | * else: |
| 307 | * it looked like a calls, |
| 308 | * but it wasn't to anywhere. |
| 309 | */ |
| 310 | goto botched; |
| 311 | default: |
| 312 | botched: |
| 313 | /* |
| 314 | * something funny going on. |
| 315 | */ |
| 316 | DBG (CALLDEBUG, printf ("[findcall]\tbut it's a botch\n")); |
| 317 | length = 1; |
| 318 | continue; |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | } |