1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)subr_prof.c 7.7 (Berkeley) 05/15/90 8 */ 9 10 #ifdef GPROF 11 #include "gprof.h" 12 #include "param.h" 13 #include "systm.h" 14 #include "malloc.h" 15 16 /* 17 * Froms is actually a bunch of unsigned shorts indexing tos 18 */ 19 int profiling = 3; 20 u_short *froms; 21 struct tostruct *tos = 0; 22 long tolimit = 0; 23 #if defined(vax) 24 char *s_lowpc = (char *)0x80000000; 25 #endif 26 #if defined(tahoe) 27 char *s_lowpc = (char *)0xc0000000; 28 #endif 29 #if defined(hp300) 30 char *s_lowpc = (char *)0x00000000; 31 #endif 32 extern char etext; 33 char *s_highpc = &etext; 34 u_long s_textsize = 0; 35 int ssiz; 36 u_short *sbuf; 37 u_short *kcount; 38 39 kmstartup() 40 { 41 u_long fromssize, tossize; 42 43 /* 44 * Round lowpc and highpc to multiples of the density we're using 45 * so the rest of the scaling (here and in gprof) stays in ints. 46 */ 47 s_lowpc = (char *) 48 ROUNDDOWN((unsigned)s_lowpc, HISTFRACTION*sizeof (HISTCOUNTER)); 49 s_highpc = (char *) 50 ROUNDUP((unsigned)s_highpc, HISTFRACTION*sizeof (HISTCOUNTER)); 51 s_textsize = s_highpc - s_lowpc; 52 printf("Profiling kernel, s_textsize=%d [%x..%x]\n", 53 s_textsize, s_lowpc, s_highpc); 54 ssiz = (s_textsize / HISTFRACTION) + sizeof (struct phdr); 55 sbuf = (u_short *)malloc(ssiz, M_GPROF, M_WAITOK); 56 if (sbuf == 0) { 57 printf("No space for monitor buffer(s)\n"); 58 return; 59 } 60 bzero(sbuf, ssiz); 61 fromssize = s_textsize / HASHFRACTION; 62 froms = (u_short *)malloc(fromssize, M_GPROF, M_WAITOK); 63 if (froms == 0) { 64 printf("No space for monitor buffer(s)\n"); 65 free(sbuf, M_GPROF); 66 sbuf = 0; 67 return; 68 } 69 bzero(froms, fromssize); 70 tolimit = s_textsize * ARCDENSITY / 100; 71 if (tolimit < MINARCS) 72 tolimit = MINARCS; 73 else if (tolimit > (0xffff - 1)) 74 tolimit = 0xffff - 1; 75 tossize = tolimit * sizeof (struct tostruct); 76 tos = (struct tostruct *)malloc(tossize, M_GPROF, M_WAITOK); 77 if (tos == 0) { 78 printf("No space for monitor buffer(s)\n"); 79 free(sbuf, M_GPROF), sbuf = 0; 80 free(froms, M_GPROF), froms = 0; 81 return; 82 } 83 bzero(tos, tossize); 84 tos[0].link = 0; 85 ((struct phdr *)sbuf)->lpc = s_lowpc; 86 ((struct phdr *)sbuf)->hpc = s_highpc; 87 ((struct phdr *)sbuf)->ncnt = ssiz; 88 kcount = (u_short *)(((int)sbuf) + sizeof (struct phdr)); 89 } 90 91 /* 92 * Special, non-profiled versions 93 */ 94 #if defined(hp300) 95 #define splhigh _splhigh 96 #define splx _splx 97 #endif 98 99 /* 100 * This routine is massaged so that it may be jsb'ed to on vax. 101 */ 102 asm(".text"); 103 asm("#the beginning of mcount()"); 104 asm(".data"); 105 mcount() 106 { 107 register char *selfpc; /* r11 => r5 */ 108 register u_short *frompcindex; /* r10 => r4 */ 109 register struct tostruct *top; /* r9 => r3 */ 110 register struct tostruct *prevtop; /* r8 => r2 */ 111 register long toindex; /* r7 => r1 */ 112 static int s; 113 114 asm(" .text"); /* make sure we're in text space */ 115 /* 116 * Check that we are profiling. 117 */ 118 if (profiling) 119 goto out; 120 /* 121 * Find the return address for mcount, 122 * and the return address for mcount's caller. 123 */ 124 #ifdef lint 125 selfpc = (char *)0; 126 frompcindex = 0; 127 #else 128 ; /* avoid label botch */ 129 #ifdef __GNUC__ 130 #if defined(vax) 131 Fix Me!! 132 #endif 133 #if defined(tahoe) 134 Fix Me!! 135 #endif 136 #if defined(hp300) 137 /* 138 * selfpc = pc pushed by mcount jsr, 139 * frompcindex = pc pushed by jsr into self. 140 * In GCC the caller's stack frame has already been built so we 141 * have to chase a6 to find caller's raddr. This assumes that all 142 * routines we are profiling were built with GCC and that all 143 * profiled routines use link/unlk. 144 */ 145 asm("movl a6@(4),%0" : "=r" (selfpc)); 146 asm("movl a6@(0)@(4),%0" : "=r" (frompcindex)); 147 #endif 148 #else 149 #if defined(vax) 150 asm(" movl (sp), r11"); /* selfpc = ... (jsb frame) */ 151 asm(" movl 16(fp), r10"); /* frompcindex = (calls frame) */ 152 #endif 153 #if defined(tahoe) 154 asm(" movl -8(fp),r12"); /* selfpc = callf frame */ 155 asm(" movl (fp),r11"); 156 asm(" movl -8(r11),r11"); /* frompcindex = 1 callf frame back */ 157 #endif 158 #if defined(hp300) 159 asm(" .text"); /* make sure we're in text space */ 160 asm(" movl a6@(4),a5"); /* selfpc = pc pushed by mcount jsr */ 161 asm(" movl a6@(8),a4"); /* frompcindex = pc pushed by jsr into 162 self, stack frame not yet built */ 163 #endif 164 #endif /* not __GNUC__ */ 165 #endif /* not lint */ 166 /* 167 * Insure that we cannot be recursively invoked. 168 * this requires that splhigh() and splx() below 169 * do NOT call mcount! 170 */ 171 s = splhigh(); 172 /* 173 * Check that frompcindex is a reasonable pc value. 174 * For example: signal catchers get called from the stack, 175 * not from text space. too bad. 176 */ 177 frompcindex = (u_short *)((long)frompcindex - (long)s_lowpc); 178 if ((u_long)frompcindex > s_textsize) 179 goto done; 180 frompcindex = 181 &froms[((long)frompcindex) / (HASHFRACTION * sizeof (*froms))]; 182 toindex = *frompcindex; 183 if (toindex == 0) { 184 /* 185 * First time traversing this arc 186 */ 187 toindex = ++tos[0].link; 188 if (toindex >= tolimit) 189 goto overflow; 190 *frompcindex = toindex; 191 top = &tos[toindex]; 192 top->selfpc = selfpc; 193 top->count = 1; 194 top->link = 0; 195 goto done; 196 } 197 top = &tos[toindex]; 198 if (top->selfpc == selfpc) { 199 /* 200 * Arc at front of chain; usual case. 201 */ 202 top->count++; 203 goto done; 204 } 205 /* 206 * Have to go looking down chain for it. 207 * Top points to what we are looking at, 208 * prevtop points to previous top. 209 * We know it is not at the head of the chain. 210 */ 211 for (; /* goto done */; ) { 212 if (top->link == 0) { 213 /* 214 * Top is end of the chain and none of the chain 215 * had top->selfpc == selfpc. 216 * So we allocate a new tostruct 217 * and link it to the head of the chain. 218 */ 219 toindex = ++tos[0].link; 220 if (toindex >= tolimit) 221 goto overflow; 222 top = &tos[toindex]; 223 top->selfpc = selfpc; 224 top->count = 1; 225 top->link = *frompcindex; 226 *frompcindex = toindex; 227 goto done; 228 } 229 /* 230 * Otherwise, check the next arc on the chain. 231 */ 232 prevtop = top; 233 top = &tos[top->link]; 234 if (top->selfpc == selfpc) { 235 /* 236 * There it is, increment its count and 237 * move it to the head of the chain. 238 */ 239 top->count++; 240 toindex = prevtop->link; 241 prevtop->link = top->link; 242 top->link = *frompcindex; 243 *frompcindex = toindex; 244 goto done; 245 } 246 247 } 248 done: 249 splx(s); 250 /* and fall through */ 251 out: 252 #if defined(vax) 253 asm(" rsb"); 254 #endif 255 return; 256 overflow: 257 profiling = 3; 258 printf("mcount: tos overflow\n"); 259 goto out; 260 } 261 asm(".text"); 262 asm("#the end of mcount()"); 263 asm(".data"); 264 #endif 265