/* -*- tab-width: 8; c-basic-offset: 2 -*- */ /* * File stabs.c - read stabs information from the wine executable itself. * * Copyright (C) 1996, Eric Youngdale. */ #include "config.h" #include #include #include #ifdef HAVE_SYS_MMAN_H #include #endif #include #include #include #include #include #ifndef PATH_MAX #define PATH_MAX _MAX_PATH #endif #include "options.h" #include "debugger.h" #if defined(__svr4__) || defined(__sun) #define __ELF__ #endif #ifdef __ELF__ #ifdef HAVE_ELF_H # include #endif #ifdef HAVE_LINK_H # include #endif #elif defined(__EMX__) #ifdef HAVE_A_OUT_H # include #endif #else #ifdef HAVE_A_OUT_H # include #endif #endif #ifndef N_UNDF #define N_UNDF 0x00 #endif #define N_GSYM 0x20 #define N_FUN 0x24 #define N_STSYM 0x26 #define N_LCSYM 0x28 #define N_MAIN 0x2a #define N_ROSYM 0x2c #define N_OPT 0x3c #define N_RSYM 0x40 #define N_SLINE 0x44 #define N_SO 0x64 #define N_LSYM 0x80 #define N_BINCL 0x82 #define N_SOL 0x84 #define N_PSYM 0xa0 #define N_EINCL 0xa2 #define N_LBRAC 0xc0 #define N_EXCL 0xc2 #define N_RBRAC 0xe0 struct stab_nlist { union { char *n_name; struct stab_nlist *n_next; long n_strx; } n_un; unsigned char n_type; char n_other; short n_desc; unsigned long n_value; }; /* * This is used to keep track of known datatypes so that we don't redefine * them over and over again. It sucks up lots of memory otherwise. */ struct known_typedef { struct known_typedef * next; char * name; int ndefs; struct datatype * types[1]; }; #define NR_STAB_HASH 521 struct known_typedef * ktd_head[NR_STAB_HASH] = {NULL,}; static unsigned int stab_hash( const char * name ) { unsigned int hash = 0; unsigned int tmp; const char * p; p = name; while (*p) { hash = (hash << 4) + *p++; if( (tmp = (hash & 0xf0000000)) ) { hash ^= tmp >> 24; } hash &= ~tmp; } return hash % NR_STAB_HASH; } static void stab_strcpy(char * dest, const char * source) { /* * A strcpy routine that stops when we hit the ':' character. * Faster than copying the whole thing, and then nuking the * ':'. */ while(*source != '\0' && *source != ':') *dest++ = *source++; *dest++ = '\0'; } typedef struct { char* name; unsigned long value; int idx; struct datatype** vector; int nrofentries; } include_def; #define MAX_INCLUDES 256 static include_def* include_defs = NULL; static int num_include_def = 0; static int num_alloc_include_def = 0; static int cu_include_stack[MAX_INCLUDES]; static int cu_include_stk_idx = 0; static struct datatype** cu_vector = NULL; static int cu_nrofentries = 0; static int DEBUG_CreateInclude(const char* file, unsigned long val) { if (num_include_def == num_alloc_include_def) { num_alloc_include_def += 256; include_defs = DBG_realloc(include_defs, sizeof(include_defs[0])*num_alloc_include_def); memset(include_defs+num_include_def, 0, sizeof(include_defs[0])*256); } include_defs[num_include_def].name = DBG_strdup(file); include_defs[num_include_def].value = val; include_defs[num_include_def].vector = NULL; include_defs[num_include_def].nrofentries = 0; return num_include_def++; } static int DEBUG_FindInclude(const char* file, unsigned long val) { int i; for (i = 0; i < num_include_def; i++) { if (val == include_defs[i].value && strcmp(file, include_defs[i].name) == 0) return i; } return -1; } static int DEBUG_AddInclude(int idx) { ++cu_include_stk_idx; /* is this happen, just bump MAX_INCLUDES */ /* we could also handle this as another dynarray */ assert(cu_include_stk_idx < MAX_INCLUDES); cu_include_stack[cu_include_stk_idx] = idx; return cu_include_stk_idx; } static void DEBUG_ResetIncludes(void) { /* * The datatypes that we would need to use are reset when * we start a new file. (at least the ones in filenr == 0 */ cu_include_stk_idx = 0;/* keep 0 as index for the .c file itself */ memset(cu_vector, 0, sizeof(cu_vector[0]) * cu_nrofentries); } static void DEBUG_FreeIncludes(void) { int i; DEBUG_ResetIncludes(); for (i = 0; i < num_include_def; i++) { DBG_free(include_defs[i].name); DBG_free(include_defs[i].vector); } DBG_free(include_defs); include_defs = NULL; num_include_def = 0; num_alloc_include_def = 0; DBG_free(cu_vector); cu_vector = NULL; cu_nrofentries = 0; } #define MAX_TD_NESTING 128 static struct datatype** DEBUG_FileSubNr2StabEnum(int filenr, int subnr) { struct datatype** ret; /* fprintf(stderr, "creating type id for (%d,%d)\n", filenr, subnr); */ /* FIXME: I could perhaps create a dummy include_def for each compilation * unit which would allow not to handle those two cases separately */ if (filenr == 0) { if (cu_nrofentries <= subnr) { cu_vector = DBG_realloc(cu_vector, sizeof(cu_vector[0])*(subnr+1)); memset(cu_vector+cu_nrofentries, 0, sizeof(cu_vector[0])*(subnr+1-cu_nrofentries)); cu_nrofentries = subnr + 1; } ret = &cu_vector[subnr]; } else { include_def* idef; assert(filenr <= cu_include_stk_idx); idef = &include_defs[cu_include_stack[filenr]]; if (idef->nrofentries <= subnr) { idef->vector = DBG_realloc(idef->vector, sizeof(idef->vector[0])*(subnr+1)); memset(idef->vector + idef->nrofentries, 0, sizeof(idef->vector[0])*(subnr+1-idef->nrofentries)); idef->nrofentries = subnr + 1; } ret = &idef->vector[subnr]; } /* fprintf(stderr,"(%d,%d) is %d\n",filenr,subnr,ret); */ return ret; } static struct datatype** DEBUG_ReadTypeEnumBackwards(char*x) { int filenr,subnr; if (*x==')') { while (*x!='(') x--; x++; /* '(' */ filenr=strtol(x,&x,10); /* */ x++; /* ',' */ subnr=strtol(x,&x,10); /* */ x++; /* ')' */ } else { while ((*x>='0') && (*x<='9')) x--; filenr = 0; subnr = atol(x+1); } return DEBUG_FileSubNr2StabEnum(filenr,subnr); } static struct datatype** DEBUG_ReadTypeEnum(char **x) { int filenr,subnr; if (**x=='(') { (*x)++; /* '(' */ filenr=strtol(*x,x,10); /* */ (*x)++; /* ',' */ subnr=strtol(*x,x,10); /* */ (*x)++; /* ')' */ } else { filenr = 0; subnr = strtol(*x,x,10); /* */ } return DEBUG_FileSubNr2StabEnum(filenr,subnr); } static int DEBUG_RegisterTypedef(const char * name, struct datatype ** types, int ndef) { int hash; struct known_typedef * ktd; if( ndef == 1 ) return TRUE; ktd = (struct known_typedef *) DBG_alloc(sizeof(struct known_typedef) + (ndef - 1) * sizeof(struct datatype *)); hash = stab_hash(name); ktd->name = DBG_strdup(name); ktd->ndefs = ndef; memcpy(&ktd->types[0], types, ndef * sizeof(struct datatype *)); ktd->next = ktd_head[hash]; ktd_head[hash] = ktd; return TRUE; } static int DEBUG_HandlePreviousTypedef(const char * name, const char * stab) { int count; enum debug_type expect; int hash; struct known_typedef * ktd; char * ptr; hash = stab_hash(name); for(ktd = ktd_head[hash]; ktd; ktd = ktd->next) if ((ktd->name[0] == name[0]) && (strcmp(name, ktd->name) == 0) ) break; /* * Didn't find it. This must be a new one. */ if( ktd == NULL ) return FALSE; /* * Examine the stab to make sure it has the same number of definitions. */ count = 0; for(ptr = strchr(stab, '='); ptr; ptr = strchr(ptr+1, '=')) { if( count >= ktd->ndefs ) return FALSE; /* * Make sure the types of all of the objects is consistent with * what we have already parsed. */ switch(ptr[1]) { case '*': expect = DT_POINTER; break; case 's': case 'u': expect = DT_STRUCT; break; case 'a': expect = DT_ARRAY; break; case '(': /* it's mainly a ref to another typedef, skip it */ expect = -1; break; case '1': case 'r': expect = DT_BASIC; break; case 'x': expect = DT_STRUCT; break; case 'e': expect = DT_ENUM; break; case 'f': expect = DT_FUNC; break; default: fprintf(stderr, "Unknown type (%c).\n",ptr[1]); return FALSE; } if( expect != -1 && expect != DEBUG_GetType(ktd->types[count]) ) return FALSE; count++; } if( ktd->ndefs != count ) return FALSE; /* * Go through, dig out all of the type numbers, and substitute the * appropriate things. */ count = 0; for(ptr = strchr(stab, '='); ptr; ptr = strchr(ptr+1, '=')) *DEBUG_ReadTypeEnumBackwards(ptr-1) = ktd->types[count++]; return TRUE; } static int DEBUG_FreeRegisteredTypedefs(void) { int count; int j; struct known_typedef * ktd; struct known_typedef * next; count = 0; for(j=0; j < NR_STAB_HASH; j++ ) { for(ktd = ktd_head[j]; ktd; ktd = next) { count++; next = ktd->next; DBG_free(ktd->name); DBG_free(ktd); } ktd_head[j] = NULL; } return TRUE; } static int DEBUG_ParseTypedefStab(char * ptr, const char * typename) { int arrmax; int arrmin; char * c; struct datatype * curr_type; struct datatype * datatype; struct datatype * curr_types[MAX_TD_NESTING]; char element_name[1024]; int ntypes = 0, ntp; int offset; const char * orig_typename; int size; char * tc; char * tc2; int failure; orig_typename = typename; if( DEBUG_HandlePreviousTypedef(typename, ptr) ) return TRUE; /* * Go from back to front. First we go through and figure out what * type numbers we need, and register those types. Then we go in * and fill the details. */ for( c = strchr(ptr, '='); c != NULL; c = strchr(c + 1, '=') ) { /* * Back up until we get to a non-numeric character, to get datatype */ struct datatype** dt = DEBUG_ReadTypeEnumBackwards(c-1); if( ntypes >= MAX_TD_NESTING ) { /* * If this ever happens, just bump the counter. */ fprintf(stderr, "Typedef nesting overflow\n"); return FALSE; } switch(c[1]) { case '*': *dt = DEBUG_NewDataType(DT_POINTER, NULL); curr_types[ntypes++] = *dt; break; case 's': case 'u': *dt = DEBUG_NewDataType(DT_STRUCT, typename); curr_types[ntypes++] = *dt; break; case 'a': *dt = DEBUG_NewDataType(DT_ARRAY, NULL); curr_types[ntypes++] = *dt; break; case '(': /* will be handled in next loop, * just a ref to another type */ curr_types[ntypes++] = NULL; break; case '1': case 'r': *dt = DEBUG_NewDataType(DT_BASIC, typename); curr_types[ntypes++] = *dt; break; case 'x': stab_strcpy(element_name, c + 3); *dt = DEBUG_NewDataType(DT_STRUCT, element_name); curr_types[ntypes++] = *dt; break; case 'e': *dt = DEBUG_NewDataType(DT_ENUM, NULL); curr_types[ntypes++] = *dt; break; case 'f': *dt = DEBUG_NewDataType(DT_FUNC, NULL); curr_types[ntypes++] = *dt; break; default: fprintf(stderr, "Unknown type (%c).\n",c[1]); } typename = NULL; } ntp = ntypes - 1; /* * OK, now take a second sweep through. Now we will be digging * out the definitions of the various components, and storing * them in the skeletons that we have already allocated. We take * a right-to left search as this is much easier to parse. */ for( c = strrchr(ptr, '='); c != NULL; c = strrchr(ptr, '=') ) { struct datatype** dt = DEBUG_ReadTypeEnumBackwards(c-1); struct datatype** dt2; curr_type = *dt; switch(c[1]) { case 'x': ntp--; tc = c + 3; while( *tc != ':' ) tc++; tc++; if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc); break; case '*': case 'f': ntp--; tc = c + 2; datatype = *DEBUG_ReadTypeEnum(&tc); DEBUG_SetPointerType(curr_type, datatype); if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc); break; case '(': tc = c + 1; dt2 = DEBUG_ReadTypeEnum(&tc); if (!*dt && *dt2) { *dt = *dt2; } else if (!*dt && !*dt2) { /* this should be a basic type, define it */ *dt2 = *dt = DEBUG_NewDataType(DT_BASIC, typename); } else { fprintf(stderr, "Unknown condition %p %p (%s)\n", *dt, *dt2, ptr); } if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc); curr_types[ntp--] = *dt; break; case '1': case 'r': ntp--; /* * We have already handled these above. */ *c = '\0'; break; case 'a': ntp--; /* ar;;;,,;; */ tc = c + 3; /* 'r' */ DEBUG_ReadTypeEnum(&tc); tc++; /* ';' */ arrmin = strtol(tc, &tc, 10); /* */ tc++; /* ';' */ arrmax = strtol(tc, &tc, 10); /* */ tc++; /* ';' */ datatype = *DEBUG_ReadTypeEnum(&tc); /* */ if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc); DEBUG_SetArrayParams(curr_type, arrmin, arrmax, datatype); break; case 's': case 'u': ntp--; failure = 0; tc = c + 2; if( DEBUG_SetStructSize(curr_type, strtol(tc, &tc, 10)) == FALSE ) { /* * We have already filled out this structure. Nothing to do, * so just skip forward to the end of the definition. */ while( tc[0] != ';' && tc[1] != ';' ) tc++; tc += 2; if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc + 1); continue; } /* * Now parse the individual elements of the structure/union. */ while(*tc != ';') { char *ti; tc2 = element_name; while(*tc != ':') *tc2++ = *tc++; tc++; *tc2++ = '\0'; ti=tc; datatype = *DEBUG_ReadTypeEnum(&tc); *tc='\0'; tc++; offset = strtol(tc, &tc, 10); tc++; size = strtol(tc, &tc, 10); tc++; if (datatype) DEBUG_AddStructElement(curr_type, element_name, datatype, offset, size); else { failure = 1; /* ... but proceed parsing to the end of the stab */ fprintf(stderr, "failure on %s %s\n", ptr, ti); } } if (failure) { /* if we had a undeclared value this one is undeclared too. * remove it from the stab_types. * I just set it to NULL to detect bugs in my thoughtprocess. * FIXME: leaks the memory for the structure elements. * FIXME: such structures should have been optimized away * by ld. */ *dt = NULL; } if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc + 1); break; case 'e': ntp--; tc = c + 2; /* * Now parse the individual elements of the structure/union. */ while(*tc != ';') { tc2 = element_name; while(*tc != ':') *tc2++ = *tc++; tc++; *tc2++ = '\0'; offset = strtol(tc, &tc, 10); tc++; DEBUG_AddStructElement(curr_type, element_name, NULL, offset, 0); } if( *tc == '\0' ) *c = '\0'; else strcpy(c, tc + 1); break; default: fprintf(stderr, "Unknown type (%c).\n",c[1]); break; } } /* * Now register the type so that if we encounter it again, we will know * what to do. */ DEBUG_RegisterTypedef(orig_typename, curr_types, ntypes); return TRUE; } static struct datatype * DEBUG_ParseStabType(const char * stab) { char * c; /* * Look through the stab definition, and figure out what datatype * this represents. If we have something we know about, assign the * type. */ c = strchr(stab, ':'); if( c == NULL ) return NULL; c++; /* * The next character says more about the type (i.e. data, function, etc) * of symbol. Skip it. */ if (*c != '(') c++; /* * The next is either an integer or a (integer,integer). * The DEBUG_ReadTypeEnum takes care that stab_types is large enough. */ return *DEBUG_ReadTypeEnum(&c); } int DEBUG_ParseStabs(char * addr, unsigned int load_offset, unsigned int staboff, int stablen, unsigned int strtaboff, int strtablen) { struct name_hash * curr_func = NULL; struct wine_locals * curr_loc = NULL; struct name_hash * curr_sym = NULL; char currpath[PATH_MAX]; int i; int in_external_file = FALSE; int last_nso = -1; int len; DBG_VALUE new_value; int nstab; char * ptr; char * stabbuff; int stabbufflen; struct stab_nlist * stab_ptr; char * strs; int strtabinc; char * subpath = NULL; char symname[4096]; nstab = stablen / sizeof(struct stab_nlist); stab_ptr = (struct stab_nlist *) (addr + staboff); strs = (char *) (addr + strtaboff); memset(currpath, 0, sizeof(currpath)); /* * Allocate a buffer into which we can build stab strings for cases * where the stab is continued over multiple lines. */ stabbufflen = 65536; stabbuff = (char *) DBG_alloc(stabbufflen); strtabinc = 0; stabbuff[0] = '\0'; for(i=0; i < nstab; i++, stab_ptr++ ) { ptr = strs + (unsigned int) stab_ptr->n_un.n_name; if( ptr[strlen(ptr) - 1] == '\\' ) { /* * Indicates continuation. Append this to the buffer, and go onto the * next record. Repeat the process until we find a stab without the * '/' character, as this indicates we have the whole thing. */ len = strlen(ptr); if( strlen(stabbuff) + len > stabbufflen ) { stabbufflen += 65536; stabbuff = (char *) DBG_realloc(stabbuff, stabbufflen); } strncat(stabbuff, ptr, len - 1); continue; } else if( stabbuff[0] != '\0' ) { strcat( stabbuff, ptr); ptr = stabbuff; } if( strchr(ptr, '=') != NULL ) { /* * The stabs aren't in writable memory, so copy it over so we are * sure we can scribble on it. */ if( ptr != stabbuff ) { strcpy(stabbuff, ptr); ptr = stabbuff; } stab_strcpy(symname, ptr); DEBUG_ParseTypedefStab(ptr, symname); } switch(stab_ptr->n_type) { case N_GSYM: /* * These are useless with ELF. They have no value, and you have to * read the normal symbol table to get the address. Thus we * ignore them, and when we process the normal symbol table * we should do the right thing. * * With a.out, they actually do make some amount of sense. */ new_value.addr.seg = 0; new_value.type = DEBUG_ParseStabType(ptr); new_value.addr.off = load_offset + stab_ptr->n_value; new_value.cookie = DV_TARGET; stab_strcpy(symname, ptr); #ifdef __ELF__ curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath, SYM_WINE | SYM_DATA | SYM_INVALID); #else curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath, SYM_WINE | SYM_DATA ); #endif break; case N_RBRAC: case N_LBRAC: /* * We need to keep track of these so we get symbol scoping * right for local variables. For now, we just ignore them. * The hooks are already there for dealing with this however, * so all we need to do is to keep count of the nesting level, * and find the RBRAC for each matching LBRAC. */ break; case N_LCSYM: case N_STSYM: /* * These are static symbols and BSS symbols. */ new_value.addr.seg = 0; new_value.type = DEBUG_ParseStabType(ptr); new_value.addr.off = load_offset + stab_ptr->n_value; new_value.cookie = DV_TARGET; stab_strcpy(symname, ptr); curr_sym = DEBUG_AddSymbol( symname, &new_value, currpath, SYM_WINE | SYM_DATA ); break; case N_PSYM: /* * These are function parameters. */ if( curr_func != NULL && !in_external_file ) { stab_strcpy(symname, ptr); curr_loc = DEBUG_AddLocal( curr_func, 0, stab_ptr->n_value, 0, 0, symname ); DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) ); } break; case N_RSYM: if( curr_func != NULL && !in_external_file ) { stab_strcpy(symname, ptr); curr_loc = DEBUG_AddLocal( curr_func, stab_ptr->n_value + 1, 0, 0, 0, symname ); DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) ); } break; case N_LSYM: if( curr_func != NULL && !in_external_file ) { stab_strcpy(symname, ptr); curr_loc = DEBUG_AddLocal( curr_func, 0, stab_ptr->n_value, 0, 0, symname ); DEBUG_SetLocalSymbolType( curr_loc, DEBUG_ParseStabType(ptr) ); } break; case N_SLINE: /* * This is a line number. These are always relative to the start * of the function (N_FUN), and this makes the lookup easier. */ if( curr_func != NULL && !in_external_file ) { #ifdef __ELF__ DEBUG_AddLineNumber(curr_func, stab_ptr->n_desc, stab_ptr->n_value); #else #if 0 /* * This isn't right. The order of the stabs is different under * a.out, and as a result we would end up attaching the line * number to the wrong function. */ DEBUG_AddLineNumber(curr_func, stab_ptr->n_desc, stab_ptr->n_value - curr_func->addr.off); #endif #endif } break; case N_FUN: /* * First, clean up the previous function we were working on. */ DEBUG_Normalize(curr_func); /* * For now, just declare the various functions. Later * on, we will add the line number information and the * local symbols. */ if( !in_external_file ) { new_value.addr.seg = 0; new_value.type = DEBUG_ParseStabType(ptr); new_value.addr.off = load_offset + stab_ptr->n_value; new_value.cookie = DV_TARGET; /* * Copy the string to a temp buffer so we * can kill everything after the ':'. We do * it this way because otherwise we end up dirtying * all of the pages related to the stabs, and that * sucks up swap space like crazy. */ stab_strcpy(symname, ptr); curr_func = DEBUG_AddSymbol( symname, &new_value, currpath, SYM_WINE | SYM_FUNC); } else { /* * Don't add line number information for this function * any more. */ curr_func = NULL; } break; case N_SO: /* * This indicates a new source file. Append the records * together, to build the correct path name. */ #ifndef __ELF__ /* * With a.out, there is no NULL string N_SO entry at the end of * the file. Thus when we find non-consecutive entries, * we consider that a new file is started. */ if( last_nso < i-1 ) { currpath[0] = '\0'; DEBUG_Normalize(curr_func); curr_func = NULL; } #endif if( *ptr == '\0' ) { /* * Nuke old path. */ currpath[0] = '\0'; DEBUG_Normalize(curr_func); curr_func = NULL; } else { if (*ptr != '/') strcat(currpath, ptr); else strcpy(currpath, ptr); subpath = ptr; DEBUG_ResetIncludes(); } last_nso = i; break; case N_SOL: /* * This indicates we are including stuff from an include file. * If this is the main source, enable the debug stuff, otherwise * ignore it. */ in_external_file = !(subpath == NULL || strcmp(ptr, subpath) == 0); break; case N_UNDF: strs += strtabinc; strtabinc = stab_ptr->n_value; DEBUG_Normalize(curr_func); curr_func = NULL; break; case N_OPT: /* * Ignore this. We don't care what it points to. */ break; case N_BINCL: DEBUG_AddInclude(DEBUG_CreateInclude(ptr, stab_ptr->n_value)); break; case N_EINCL: break; case N_EXCL: DEBUG_AddInclude(DEBUG_FindInclude(ptr, stab_ptr->n_value)); break; case N_MAIN: /* * Always ignore these. GCC doesn't even generate them. */ break; default: fprintf(stderr, "Unkown stab type 0x%02x\n", stab_ptr->n_type); break; } stabbuff[0] = '\0'; #if 0 fprintf(stderr, "%d %x %s\n", stab_ptr->n_type, (unsigned int) stab_ptr->n_value, strs + (unsigned int) stab_ptr->n_un.n_name); #endif } DEBUG_FreeRegisteredTypedefs(); DEBUG_FreeIncludes(); return TRUE; } #ifdef __ELF__ /* * Walk through the entire symbol table and add any symbols we find there. * This can be used in cases where we have stripped ELF shared libraries, * or it can be used in cases where we have data symbols for which the address * isn't encoded in the stabs. * * This is all really quite easy, since we don't have to worry about line * numbers or local data variables. */ static int DEBUG_ProcessElfSymtab(char * addr, unsigned int load_offset, Elf32_Shdr * symtab, Elf32_Shdr * strtab) { char * curfile = NULL; struct name_hash * curr_sym = NULL; int flags; int i; DBG_VALUE new_value; int nsym; char * strp; char * symname; Elf32_Sym * symp; symp = (Elf32_Sym *) (addr + symtab->sh_offset); nsym = symtab->sh_size / sizeof(*symp); strp = (char *) (addr + strtab->sh_offset); for(i=0; i < nsym; i++, symp++) { /* * Ignore certain types of entries which really aren't of that much * interest. */ if( ELF32_ST_TYPE(symp->st_info) == STT_SECTION ) { continue; } symname = strp + symp->st_name; /* * Save the name of the current file, so we have a way of tracking * static functions/data. */ if( ELF32_ST_TYPE(symp->st_info) == STT_FILE ) { curfile = symname; continue; } /* * See if we already have something for this symbol. * If so, ignore this entry, because it would have come from the * stabs or from a previous symbol. If the value is different, * we will have to keep the darned thing, because there can be * multiple local symbols by the same name. */ if( (DEBUG_GetSymbolValue(symname, -1, &new_value, FALSE ) == TRUE) && (new_value.addr.off == (load_offset + symp->st_value)) ) continue; new_value.addr.seg = 0; new_value.type = NULL; new_value.addr.off = load_offset + symp->st_value; new_value.cookie = DV_TARGET; flags = SYM_WINE | (ELF32_ST_BIND(symp->st_info) == STT_FUNC ? SYM_FUNC : SYM_DATA); if( ELF32_ST_BIND(symp->st_info) == STB_GLOBAL ) curr_sym = DEBUG_AddSymbol( symname, &new_value, NULL, flags ); else curr_sym = DEBUG_AddSymbol( symname, &new_value, curfile, flags ); /* * Record the size of the symbol. This can come in handy in * some cases. Not really used yet, however. */ if( symp->st_size != 0 ) DEBUG_SetSymbolSize(curr_sym, symp->st_size); } return TRUE; } static int DEBUG_ProcessElfObject(const char * filename, unsigned int load_offset) { int rtn = FALSE; struct stat statbuf; int fd = -1; int status; char * addr = (char *) 0xffffffff; Elf32_Ehdr * ehptr; Elf32_Shdr * spnt; char * shstrtab; int nsect; int i; int stabsect; int stabstrsect; /* * Make sure we can stat and open this file. */ if( filename == NULL ) goto leave; status = stat(filename, &statbuf); if( status == -1 ) { char *s,*t,*fn,*paths; if (strchr(filename,'/')) goto leave; paths = DBG_strdup(getenv("PATH")); s = paths; while (s && *s) { t = strchr(s,':'); if (t) *t='\0'; fn = (char*)DBG_alloc(strlen(filename)+1+strlen(s)+1); strcpy(fn,s); strcat(fn,"/"); strcat(fn,filename); if ((rtn = DEBUG_ProcessElfObject(fn,load_offset))) { DBG_free(fn); DBG_free(paths); goto leave; } DBG_free(fn); if (t) s = t+1; else break; } if (!s || !*s) fprintf(stderr," not found"); DBG_free(paths); goto leave; } /* * Now open the file, so that we can mmap() it. */ fd = open(filename, O_RDONLY); if( fd == -1 ) goto leave; /* * Now mmap() the file. */ addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); if( addr == (char *) 0xffffffff ) goto leave; /* * Next, we need to find a few of the internal ELF headers within * this thing. We need the main executable header, and the section * table. */ ehptr = (Elf32_Ehdr *) addr; if( load_offset == 0 ) DEBUG_RegisterELFModule(ehptr->e_entry, filename); else DEBUG_RegisterELFModule(load_offset, filename); spnt = (Elf32_Shdr *) (addr + ehptr->e_shoff); nsect = ehptr->e_shnum; shstrtab = (addr + spnt[ehptr->e_shstrndx].sh_offset); stabsect = stabstrsect = -1; for(i=0; i < nsect; i++) { if( strcmp(shstrtab + spnt[i].sh_name, ".stab") == 0 ) stabsect = i; if( strcmp(shstrtab + spnt[i].sh_name, ".stabstr") == 0 ) stabstrsect = i; } if( stabsect == -1 || stabstrsect == -1 ) goto leave; /* * OK, now just parse all of the stabs. */ rtn = DEBUG_ParseStabs(addr, load_offset, spnt[stabsect].sh_offset, spnt[stabsect].sh_size, spnt[stabstrsect].sh_offset, spnt[stabstrsect].sh_size); if( rtn != TRUE ) goto leave; for(i=0; i < nsect; i++) { if( (strcmp(shstrtab + spnt[i].sh_name, ".symtab") == 0) && (spnt[i].sh_type == SHT_SYMTAB) ) DEBUG_ProcessElfSymtab(addr, load_offset, spnt + i, spnt + spnt[i].sh_link); if( (strcmp(shstrtab + spnt[i].sh_name, ".dynsym") == 0) && (spnt[i].sh_type == SHT_DYNSYM) ) DEBUG_ProcessElfSymtab(addr, load_offset, spnt + i, spnt + spnt[i].sh_link); } leave: if( addr != (char *) 0xffffffff ) munmap(addr, statbuf.st_size); if( fd != -1 ) close(fd); return (rtn); } int DEBUG_ReadExecutableDbgInfo(void) { const char * exe_name; DBG_VALUE val; u_long dyn_addr; Elf32_Dyn dyn; struct r_debug dbg_hdr; u_long lm_addr; struct link_map lm; Elf32_Ehdr ehdr; char bufstr[256]; int rtn = FALSE; int rowcount; exe_name = argv0; /* * Make sure we can stat and open this file. */ if( exe_name == NULL ) goto leave; fprintf( stderr, "Loading symbols: %s", exe_name ); rowcount = 17 + strlen(exe_name); DEBUG_ProcessElfObject(exe_name, 0); if (!DEBUG_GetSymbolValue("_DYNAMIC", -1, &val, FALSE)) { fprintf(stderr, "Can't find symbol _DYNAMIC\n"); goto leave; } dyn_addr = val.addr.off; do { if (!DEBUG_READ_MEM_VERBOSE((void*)dyn_addr, &dyn, sizeof(dyn))) goto leave; dyn_addr += sizeof(dyn); } while (dyn.d_tag != DT_DEBUG && dyn.d_tag != DT_NULL); if (dyn.d_tag == DT_NULL) goto leave; /* * OK, now dig into the actual tables themselves. */ if (!DEBUG_READ_MEM_VERBOSE((void*)dyn.d_un.d_ptr, &dbg_hdr, sizeof(dbg_hdr))) goto leave; /* * Now walk the linked list. In all known ELF implementations, * the dynamic loader maintains this linked list for us. In some * cases the first entry doesn't appear with a name, in other cases it * does. */ for (lm_addr = (u_long)dbg_hdr.r_map; lm_addr; lm_addr = (u_long)lm.l_next) { if (!DEBUG_READ_MEM_VERBOSE((void*)lm_addr, &lm, sizeof(lm))) goto leave; if (!DEBUG_READ_MEM_VERBOSE((void*)lm.l_addr, &ehdr, sizeof(ehdr))) continue; /* * We already got the stuff for the executable using the * argv[0] entry above. Here we only need to concentrate on any * shared libraries which may be loaded. */ if( (lm.l_addr == 0) || (ehdr.e_type != ET_DYN) ) continue; if( lm.l_name != NULL ) { if (!DEBUG_READ_MEM_VERBOSE(lm.l_name, bufstr, sizeof(bufstr))) continue; bufstr[sizeof(bufstr) - 1] = '\0'; if (rowcount + strlen(bufstr) > 76) { fprintf( stderr, "\n " ); rowcount = 3; } fprintf( stderr, " %s", bufstr ); rowcount += strlen(bufstr) + 1; DEBUG_ProcessElfObject(bufstr, lm.l_addr); } } rtn = TRUE; leave: fprintf( stderr, "\n" ); return (rtn); } #else /* !__ELF__ */ #ifdef linux /* * a.out linux. */ int DEBUG_ReadExecutableDbgInfo(void) { char * addr = (char *) 0xffffffff; char * exe_name; struct exec * ahdr; int fd = -1; int rtn = FALSE; unsigned int staboff; struct stat statbuf; int status; unsigned int stroff; exe_name = argv0; /* * Make sure we can stat and open this file. */ if( exe_name == NULL ) goto leave; status = stat(exe_name, &statbuf); if( status == -1 ) goto leave; /* * Now open the file, so that we can mmap() it. */ fd = open(exe_name, O_RDONLY); if( fd == -1 ) goto leave; /* * Now mmap() the file. */ addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); if( addr == (char *) 0xffffffff ) goto leave; ahdr = (struct exec *) addr; staboff = N_SYMOFF(*ahdr); stroff = N_STROFF(*ahdr); rtn = DEBUG_ParseStabs(addr, 0, staboff, ahdr->a_syms, stroff, statbuf.st_size - stroff); /* * Give a nice status message here... */ fprintf( stderr, "Loading symbols: %s", exe_name ); rtn = TRUE; leave: if( addr != (char *) 0xffffffff ) munmap(addr, statbuf.st_size); if( fd != -1 ) close(fd); return (rtn); } #else /* * Non-linux, non-ELF platforms. */ int DEBUG_ReadExecutableDbgInfo(void) { return FALSE; } #endif #endif /* __ELF__ */