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Diffstat (limited to 'src/libmach/machdata.c')
| -rw-r--r-- | src/libmach/machdata.c | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/src/libmach/machdata.c b/src/libmach/machdata.c new file mode 100644 index 000000000..425a92179 --- /dev/null +++ b/src/libmach/machdata.c @@ -0,0 +1,477 @@ +// Inferno libmach/machdata.c +// http://code.google.com/p/inferno-os/source/browse/utils/libmach/machdata.c +// +// Copyright © 1994-1999 Lucent Technologies Inc. +// Power PC support Copyright © 1995-2004 C H Forsyth (forsyth@terzarima.net). +// Portions Copyright © 1997-1999 Vita Nuova Limited. +// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). +// Revisions Copyright © 2000-2004 Lucent Technologies Inc. and others. +// Portions Copyright © 2009 The Go Authors. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +/* + * Debugger utilities shared by at least two architectures + */ + +#include <u.h> +#include <libc.h> +#include <bio.h> +#include <mach.h> + +#define STARTSYM "_main" +#define PROFSYM "_mainp" +#define FRAMENAME ".frame" + +extern Machdata mipsmach; + +int asstype = AMIPS; /* disassembler type */ +Machdata *machdata; /* machine-dependent functions */ + +int +localaddr(Map *map, char *fn, char *var, uvlong *r, Rgetter rget) +{ + Symbol s; + uvlong fp, pc, sp, link; + + if (!lookup(fn, 0, &s)) { + werrstr("function not found"); + return -1; + } + pc = rget(map, mach->pc); + sp = rget(map, mach->sp); + if(mach->link) + link = rget(map, mach->link); + else + link = 0; + fp = machdata->findframe(map, s.value, pc, sp, link); + if (fp == 0) { + werrstr("stack frame not found"); + return -1; + } + + if (!var || !var[0]) { + *r = fp; + return 1; + } + + if (findlocal(&s, var, &s) == 0) { + werrstr("local variable not found"); + return -1; + } + + switch (s.class) { + case CAUTO: + *r = fp - s.value; + break; + case CPARAM: /* assume address size is stack width */ + *r = fp + s.value + mach->szaddr; + break; + default: + werrstr("local variable not found: %d", s.class); + return -1; + } + return 1; +} + +/* + * Print value v as s.name[+offset] if possible, or just v. + */ +int +symoff(char *buf, int n, uvlong v, int space) +{ + Symbol s; + int r; + int32 delta; + + r = delta = 0; /* to shut compiler up */ + if (v) { + r = findsym(v, space, &s); + if (r) + delta = v-s.value; + if (delta < 0) + delta = -delta; + } + if (v == 0 || r == 0) + return snprint(buf, n, "%llux", v); + if (s.type != 't' && s.type != 'T' && delta >= 4096) + return snprint(buf, n, "%llux", v); + else if (delta) + return snprint(buf, n, "%s+%#lux", s.name, delta); + else + return snprint(buf, n, "%s", s.name); +} + +/* + * Format floating point registers + * + * Register codes in format field: + * 'X' - print as 32-bit hexadecimal value + * 'F' - 64-bit double register when modif == 'F'; else 32-bit single reg + * 'f' - 32-bit ieee float + * '8' - big endian 80-bit ieee extended float + * '3' - little endian 80-bit ieee extended float with hole in bytes 8&9 + */ +int +fpformat(Map *map, Reglist *rp, char *buf, int n, int modif) +{ + char reg[12]; + uint32 r; + + switch(rp->rformat) + { + case 'X': + if (get4(map, rp->roffs, &r) < 0) + return -1; + snprint(buf, n, "%lux", r); + break; + case 'F': /* first reg of double reg pair */ + if (modif == 'F') + if ((rp->rformat=='F') || (((rp+1)->rflags&RFLT) && (rp+1)->rformat == 'f')) { + if (get1(map, rp->roffs, (uchar *)reg, 8) < 0) + return -1; + machdata->dftos(buf, n, reg); + if (rp->rformat == 'F') + return 1; + return 2; + } + /* treat it like 'f' */ + if (get1(map, rp->roffs, (uchar *)reg, 4) < 0) + return -1; + machdata->sftos(buf, n, reg); + break; + case 'f': /* 32 bit float */ + if (get1(map, rp->roffs, (uchar *)reg, 4) < 0) + return -1; + machdata->sftos(buf, n, reg); + break; + case '3': /* little endian ieee 80 with hole in bytes 8&9 */ + if (get1(map, rp->roffs, (uchar *)reg, 10) < 0) + return -1; + memmove(reg+10, reg+8, 2); /* open hole */ + memset(reg+8, 0, 2); /* fill it */ + leieee80ftos(buf, n, reg); + break; + case '8': /* big-endian ieee 80 */ + if (get1(map, rp->roffs, (uchar *)reg, 10) < 0) + return -1; + beieee80ftos(buf, n, reg); + break; + default: /* unknown */ + break; + } + return 1; +} + +char * +_hexify(char *buf, uint32 p, int zeros) +{ + uint32 d; + + d = p/16; + if(d) + buf = _hexify(buf, d, zeros-1); + else + while(zeros--) + *buf++ = '0'; + *buf++ = "0123456789abcdef"[p&0x0f]; + return buf; +} + +/* + * These routines assume that if the number is representable + * in IEEE floating point, it will be representable in the native + * double format. Naive but workable, probably. + */ +int +ieeedftos(char *buf, int n, uint32 h, uint32 l) +{ + double fr; + int exp; + + if (n <= 0) + return 0; + + + if(h & (1L<<31)){ + *buf++ = '-'; + h &= ~(1L<<31); + }else + *buf++ = ' '; + n--; + if(l == 0 && h == 0) + return snprint(buf, n, "0."); + exp = (h>>20) & ((1L<<11)-1L); + if(exp == 0) + return snprint(buf, n, "DeN(%.8lux%.8lux)", h, l); + if(exp == ((1L<<11)-1L)){ + if(l==0 && (h&((1L<<20)-1L)) == 0) + return snprint(buf, n, "Inf"); + else + return snprint(buf, n, "NaN(%.8lux%.8lux)", h&((1L<<20)-1L), l); + } + exp -= (1L<<10) - 2L; + fr = l & ((1L<<16)-1L); + fr /= 1L<<16; + fr += (l>>16) & ((1L<<16)-1L); + fr /= 1L<<16; + fr += (h & (1L<<20)-1L) | (1L<<20); + fr /= 1L<<21; + fr = ldexp(fr, exp); + return snprint(buf, n, "%.18g", fr); +} + +int +ieeesftos(char *buf, int n, uint32 h) +{ + double fr; + int exp; + + if (n <= 0) + return 0; + + if(h & (1L<<31)){ + *buf++ = '-'; + h &= ~(1L<<31); + }else + *buf++ = ' '; + n--; + if(h == 0) + return snprint(buf, n, "0."); + exp = (h>>23) & ((1L<<8)-1L); + if(exp == 0) + return snprint(buf, n, "DeN(%.8lux)", h); + if(exp == ((1L<<8)-1L)){ + if((h&((1L<<23)-1L)) == 0) + return snprint(buf, n, "Inf"); + else + return snprint(buf, n, "NaN(%.8lux)", h&((1L<<23)-1L)); + } + exp -= (1L<<7) - 2L; + fr = (h & ((1L<<23)-1L)) | (1L<<23); + fr /= 1L<<24; + fr = ldexp(fr, exp); + return snprint(buf, n, "%.9g", fr); +} + +int +beieeesftos(char *buf, int n, void *s) +{ + return ieeesftos(buf, n, beswal(*(uint32*)s)); +} + +int +beieeedftos(char *buf, int n, void *s) +{ + return ieeedftos(buf, n, beswal(*(uint32*)s), beswal(((uint32*)(s))[1])); +} + +int +leieeesftos(char *buf, int n, void *s) +{ + return ieeesftos(buf, n, leswal(*(uint32*)s)); +} + +int +leieeedftos(char *buf, int n, void *s) +{ + return ieeedftos(buf, n, leswal(((uint32*)(s))[1]), leswal(*(uint32*)s)); +} + +/* packed in 12 bytes, with s[2]==s[3]==0; mantissa starts at s[4]*/ +int +beieee80ftos(char *buf, int n, void *s) +{ + uchar *reg = (uchar*)s; + int i; + uint32 x; + uchar ieee[8+8]; /* room for slop */ + uchar *p, *q; + + memset(ieee, 0, sizeof(ieee)); + /* sign */ + if(reg[0] & 0x80) + ieee[0] |= 0x80; + + /* exponent */ + x = ((reg[0]&0x7F)<<8) | reg[1]; + if(x == 0) /* number is ±0 */ + goto done; + if(x == 0x7FFF){ + if(memcmp(reg+4, ieee+1, 8) == 0){ /* infinity */ + x = 2047; + }else{ /* NaN */ + x = 2047; + ieee[7] = 0x1; /* make sure */ + } + ieee[0] |= x>>4; + ieee[1] |= (x&0xF)<<4; + goto done; + } + x -= 0x3FFF; /* exponent bias */ + x += 1023; + if(x >= (1<<11) || ((reg[4]&0x80)==0 && x!=0)) + return snprint(buf, n, "not in range"); + ieee[0] |= x>>4; + ieee[1] |= (x&0xF)<<4; + + /* mantissa */ + p = reg+4; + q = ieee+1; + for(i=0; i<56; i+=8, p++, q++){ /* move one byte */ + x = (p[0]&0x7F) << 1; + if(p[1] & 0x80) + x |= 1; + q[0] |= x>>4; + q[1] |= (x&0xF)<<4; + } + done: + return beieeedftos(buf, n, (void*)ieee); +} + +int +leieee80ftos(char *buf, int n, void *s) +{ + int i; + char *cp; + char b[12]; + + cp = (char*) s; + for(i=0; i<12; i++) + b[11-i] = *cp++; + return beieee80ftos(buf, n, b); +} + +int +cisctrace(Map *map, uvlong pc, uvlong sp, uvlong link, Tracer trace) +{ + Symbol s; + int found, i; + uvlong opc, moved; + + USED(link); + i = 0; + opc = 0; + while(pc && opc != pc) { + moved = pc2sp(pc); + if (moved == ~0) + break; + found = findsym(pc, CTEXT, &s); + if (!found) + break; + if(strcmp(STARTSYM, s.name) == 0 || strcmp(PROFSYM, s.name) == 0) + break; + + sp += moved; + opc = pc; + if (geta(map, sp, &pc) < 0) + break; + (*trace)(map, pc, sp, &s); + sp += mach->szaddr; /*assumes address size = stack width*/ + if(++i > 40) + break; + } + return i; +} + +int +risctrace(Map *map, uvlong pc, uvlong sp, uvlong link, Tracer trace) +{ + int i; + Symbol s, f; + uvlong oldpc; + + i = 0; + while(findsym(pc, CTEXT, &s)) { + if(strcmp(STARTSYM, s.name) == 0 || strcmp(PROFSYM, s.name) == 0) + break; + + if(pc == s.value) /* at first instruction */ + f.value = 0; + else if(findlocal(&s, FRAMENAME, &f) == 0) + break; + + oldpc = pc; + if(s.type == 'L' || s.type == 'l' || pc <= s.value+mach->pcquant) + pc = link; + else + if (geta(map, sp, &pc) < 0) + break; + + if(pc == 0 || (pc == oldpc && f.value == 0)) + break; + + sp += f.value; + (*trace)(map, pc-8, sp, &s); + + if(++i > 40) + break; + } + return i; +} + +uvlong +ciscframe(Map *map, uvlong addr, uvlong pc, uvlong sp, uvlong link) +{ + Symbol s; + uvlong moved; + + USED(link); + for(;;) { + moved = pc2sp(pc); + if (moved == ~0) + break; + sp += moved; + findsym(pc, CTEXT, &s); + if (addr == s.value) + return sp; + if (geta(map, sp, &pc) < 0) + break; + sp += mach->szaddr; /*assumes sizeof(addr) = stack width*/ + } + return 0; +} + +uvlong +riscframe(Map *map, uvlong addr, uvlong pc, uvlong sp, uvlong link) +{ + Symbol s, f; + + while (findsym(pc, CTEXT, &s)) { + if(strcmp(STARTSYM, s.name) == 0 || strcmp(PROFSYM, s.name) == 0) + break; + + if(pc == s.value) /* at first instruction */ + f.value = 0; + else + if(findlocal(&s, FRAMENAME, &f) == 0) + break; + + sp += f.value; + if (s.value == addr) + return sp; + + if (s.type == 'L' || s.type == 'l' || pc-s.value <= mach->szaddr*2) + pc = link; + else + if (geta(map, sp-f.value, &pc) < 0) + break; + } + return 0; +} |