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 7.11 (Berkeley) 02/24/92 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 char *s_lowpc = (char *)KERNBASE; 24 extern char etext; 25 char *s_highpc = &etext; 26 u_long s_textsize = 0; 27 int ssiz; 28 u_short *sbuf; 29 u_short *kcount; 30 31 kmstartup() 32 { 33 u_long fromssize, tossize; 34 35 /* 36 * Round lowpc and highpc to multiples of the density we're using 37 * so the rest of the scaling (here and in gprof) stays in ints. 38 */ 39 s_lowpc = (char *) 40 ROUNDDOWN((unsigned)s_lowpc, HISTFRACTION*sizeof (HISTCOUNTER)); 41 s_highpc = (char *) 42 ROUNDUP((unsigned)s_highpc, HISTFRACTION*sizeof (HISTCOUNTER)); 43 s_textsize = s_highpc - s_lowpc; 44 printf("Profiling kernel, s_textsize=%d [%x..%x]\n", 45 s_textsize, s_lowpc, s_highpc); 46 ssiz = (s_textsize / HISTFRACTION) + sizeof (struct phdr); 47 sbuf = (u_short *)malloc(ssiz, M_GPROF, M_WAITOK); 48 if (sbuf == 0) { 49 printf("No space for monitor buffer(s)\n"); 50 return; 51 } 52 bzero(sbuf, ssiz); 53 fromssize = s_textsize / HASHFRACTION; 54 froms = (u_short *)malloc(fromssize, M_GPROF, M_NOWAIT); 55 if (froms == 0) { 56 printf("No space for monitor buffer(s)\n"); 57 free(sbuf, M_GPROF); 58 sbuf = 0; 59 return; 60 } 61 bzero(froms, fromssize); 62 tolimit = s_textsize * ARCDENSITY / 100; 63 if (tolimit < MINARCS) 64 tolimit = MINARCS; 65 else if (tolimit > (0xffff - 1)) 66 tolimit = 0xffff - 1; 67 tossize = tolimit * sizeof (struct tostruct); 68 tos = (struct tostruct *)malloc(tossize, M_GPROF, M_WAITOK); 69 if (tos == 0) { 70 printf("No space for monitor buffer(s)\n"); 71 free(sbuf, M_GPROF), sbuf = 0; 72 free(froms, M_GPROF), froms = 0; 73 return; 74 } 75 bzero(tos, tossize); 76 tos[0].link = 0; 77 ((struct phdr *)sbuf)->lpc = s_lowpc; 78 ((struct phdr *)sbuf)->hpc = s_highpc; 79 ((struct phdr *)sbuf)->ncnt = ssiz; 80 kcount = (u_short *)(((int)sbuf) + sizeof (struct phdr)); 81 } 82 83 /* 84 * This routine is massaged so that it may be jsb'ed to on vax. 85 */ 86 mcount() 87 { 88 register char *selfpc; /* r11 => r5 */ 89 register u_short *frompcindex; /* r10 => r4 */ 90 register struct tostruct *top; /* r9 => r3 */ 91 register struct tostruct *prevtop; /* r8 => r2 */ 92 register long toindex; /* r7 => r1 */ 93 static int s; 94 95 /* 96 * Check that we are profiling. 97 */ 98 if (profiling) 99 goto out; 100 /* 101 * Find the return address for mcount, 102 * and the return address for mcount's caller. 103 */ 104 #ifdef lint 105 selfpc = (char *)0; 106 frompcindex = 0; 107 #else 108 ; /* avoid label botch */ 109 #ifdef __GNUC__ 110 #if defined(vax) 111 Fix Me!! 112 #endif 113 #if defined(tahoe) 114 Fix Me!! 115 #endif 116 #if defined(hp300) 117 /* 118 * selfpc = pc pushed by mcount jsr, 119 * frompcindex = pc pushed by jsr into self. 120 * In GCC the caller's stack frame has already been built so we 121 * have to chase a6 to find caller's raddr. This assumes that all 122 * routines we are profiling were built with GCC and that all 123 * profiled routines use link/unlk. 124 */ 125 asm("movl a6@(4),%0" : "=r" (selfpc)); 126 asm("movl a6@(0)@(4),%0" : "=r" (frompcindex)); 127 #endif 128 #else 129 #if defined(vax) 130 asm(" movl (sp), r11"); /* selfpc = ... (jsb frame) */ 131 asm(" movl 16(fp), r10"); /* frompcindex = (calls frame) */ 132 #endif 133 #if defined(tahoe) 134 asm(" movl -8(fp),r12"); /* selfpc = callf frame */ 135 asm(" movl (fp),r11"); 136 asm(" movl -8(r11),r11"); /* frompcindex = 1 callf frame back */ 137 #endif 138 #if defined(hp300) 139 Fix Me!! 140 #endif 141 #endif /* not __GNUC__ */ 142 #endif /* not lint */ 143 /* 144 * Insure that we cannot be recursively invoked. 145 * this requires that splhigh() and splx() below 146 * do NOT call mcount! 147 */ 148 #if defined(hp300) 149 asm("movw sr,%0" : "=g" (s)); 150 asm("movw #0x2700,sr"); 151 #else 152 s = splhigh(); 153 #endif 154 /* 155 * Check that frompcindex is a reasonable pc value. 156 * For example: signal catchers get called from the stack, 157 * not from text space. too bad. 158 */ 159 frompcindex = (u_short *)((long)frompcindex - (long)s_lowpc); 160 if ((u_long)frompcindex > s_textsize) 161 goto done; 162 frompcindex = 163 &froms[((long)frompcindex) / (HASHFRACTION * sizeof (*froms))]; 164 toindex = *frompcindex; 165 if (toindex == 0) { 166 /* 167 * First time traversing this arc 168 */ 169 toindex = ++tos[0].link; 170 if (toindex >= tolimit) 171 goto overflow; 172 *frompcindex = toindex; 173 top = &tos[toindex]; 174 top->selfpc = selfpc; 175 top->count = 1; 176 top->link = 0; 177 goto done; 178 } 179 top = &tos[toindex]; 180 if (top->selfpc == selfpc) { 181 /* 182 * Arc at front of chain; usual case. 183 */ 184 top->count++; 185 goto done; 186 } 187 /* 188 * Have to go looking down chain for it. 189 * Top points to what we are looking at, 190 * prevtop points to previous top. 191 * We know it is not at the head of the chain. 192 */ 193 for (; /* goto done */; ) { 194 if (top->link == 0) { 195 /* 196 * Top is end of the chain and none of the chain 197 * had top->selfpc == selfpc. 198 * So we allocate a new tostruct 199 * and link it to the head of the chain. 200 */ 201 toindex = ++tos[0].link; 202 if (toindex >= tolimit) 203 goto overflow; 204 top = &tos[toindex]; 205 top->selfpc = selfpc; 206 top->count = 1; 207 top->link = *frompcindex; 208 *frompcindex = toindex; 209 goto done; 210 } 211 /* 212 * Otherwise, check the next arc on the chain. 213 */ 214 prevtop = top; 215 top = &tos[top->link]; 216 if (top->selfpc == selfpc) { 217 /* 218 * There it is, increment its count and 219 * move it to the head of the chain. 220 */ 221 top->count++; 222 toindex = prevtop->link; 223 prevtop->link = top->link; 224 top->link = *frompcindex; 225 *frompcindex = toindex; 226 goto done; 227 } 228 229 } 230 done: 231 #if defined(hp300) 232 asm("movw %0,sr" : : "g" (s)); 233 #else 234 splx(s); 235 #endif 236 /* and fall through */ 237 out: 238 #if defined(vax) 239 asm(" rsb"); 240 #endif 241 return; 242 overflow: 243 profiling = 3; 244 printf("mcount: tos overflow\n"); 245 goto out; 246 } 247 asm(".text"); 248 asm("#the end of mcount()"); 249 asm(".data"); 250 #endif 251