/* Generate kernel symbol version hashes. Copyright 1996, 1997 Linux International. New implementation contributed by Richard Henderson <rth@tamu.edu> Based on original work by Bjorn Ekwall <bj0rn@blox.se> This file was part of the Linux modutils 2.4.22: moved back into the kernel sources by Rusty Russell/Kai Germaschewski. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <assert.h> #include <stdarg.h> #ifdef __GNU_LIBRARY__ #include <getopt.h> #endif /* __GNU_LIBRARY__ */ #include "genksyms.h" /*----------------------------------------------------------------------*/ #define HASH_BUCKETS 4096 static struct symbol *symtab[HASH_BUCKETS]; FILE *debugfile; int cur_line = 1; char *cur_filename, *output_directory; int flag_debug, flag_dump_defs, flag_warnings; static int errors; static int nsyms; static struct symbol *expansion_trail; static const char * const symbol_type_name[] = { "normal", "typedef", "enum", "struct", "union" }; /*----------------------------------------------------------------------*/ static const unsigned int crctab32[] = { 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, 0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU, 0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U, 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U, 0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, 0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU, 0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U, 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU, 0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, 0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U, 0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U, 0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU, 0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, 0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U, 0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU, 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U, 0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, 0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U, 0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU, 0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U, 0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U, 0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU, 0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U, 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U, 0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U, 0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U, 0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U, 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU, 0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, 0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U, 0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U, 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU, 0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU, 0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U, 0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU, 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U, 0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, 0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U, 0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU, 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U, 0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, 0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU, 0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U, 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U, 0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, 0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U, 0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U, 0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U, 0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, 0x2d02ef8dU }; static inline unsigned long partial_crc32_one(unsigned char c, unsigned long crc) { return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); } static inline unsigned long partial_crc32(const char *s, unsigned long crc) { while (*s) crc = partial_crc32_one(*s++, crc); return crc; } static inline unsigned long crc32(const char *s) { return partial_crc32(s, 0xffffffff) ^ 0xffffffff; } /*----------------------------------------------------------------------*/ static inline enum symbol_type map_to_ns(enum symbol_type t) { if (t == SYM_TYPEDEF) t = SYM_NORMAL; else if (t == SYM_UNION) t = SYM_STRUCT; return t; } struct symbol * find_symbol(const char *name, enum symbol_type ns) { unsigned long h = crc32(name) % HASH_BUCKETS; struct symbol *sym; for (sym = symtab[h]; sym ; sym = sym->hash_next) if (map_to_ns(sym->type) == map_to_ns(ns) && strcmp(name, sym->name) == 0) break; return sym; } struct symbol * add_symbol(const char *name, enum symbol_type type, struct string_list *defn, int is_extern) { unsigned long h = crc32(name) % HASH_BUCKETS; struct symbol *sym; for (sym = symtab[h]; sym ; sym = sym->hash_next) if (map_to_ns(sym->type) == map_to_ns(type) && strcmp(name, sym->name) == 0) { if (!equal_list(sym->defn, defn)) error_with_pos("redefinition of %s", name); return sym; } sym = xmalloc(sizeof(*sym)); sym->name = name; sym->type = type; sym->defn = defn; sym->expansion_trail = NULL; sym->is_extern = is_extern; sym->hash_next = symtab[h]; symtab[h] = sym; if (flag_debug) { fprintf(debugfile, "Defn for %s %s == <", symbol_type_name[type], name); if (is_extern) fputs("extern ", debugfile); print_list(debugfile, defn); fputs(">\n", debugfile); } ++nsyms; return sym; } /*----------------------------------------------------------------------*/ inline void free_node(struct string_list *node) { free(node->string); free(node); } void free_list(struct string_list *s, struct string_list *e) { while (s != e) { struct string_list *next = s->next; free_node(s); s = next; } } inline struct string_list * copy_node(struct string_list *node) { struct string_list *newnode; newnode = xmalloc(sizeof(*newnode)); newnode->string = xstrdup(node->string); newnode->tag = node->tag; return newnode; } struct string_list * copy_list(struct string_list *s, struct string_list *e) { struct string_list *h, *p; if (s == e) return NULL; p = h = copy_node(s); while ((s = s->next) != e) p = p->next = copy_node(s); p->next = NULL; return h; } int equal_list(struct string_list *a, struct string_list *b) { while (a && b) { if (a->tag != b->tag || strcmp(a->string, b->string)) return 0; a = a->next; b = b->next; } return !a && !b; } static inline void print_node(FILE *f, struct string_list *list) { switch (list->tag) { case SYM_STRUCT: putc('s', f); goto printit; case SYM_UNION: putc('u', f); goto printit; case SYM_ENUM: putc('e', f); goto printit; case SYM_TYPEDEF: putc('t', f); goto printit; printit: putc('#', f); case SYM_NORMAL: fputs(list->string, f); break; } } void print_list(FILE *f, struct string_list *list) { struct string_list **e, **b; struct string_list *tmp, **tmp2; int elem = 1; if (list == NULL) { fputs("(nil)", f); return; } tmp = list; while((tmp = tmp->next) != NULL) elem++; b = alloca(elem * sizeof(*e)); e = b + elem; tmp2 = e - 1; (*tmp2--) = list; while((list = list->next) != NULL) *(tmp2--) = list; while (b != e) { print_node(f, *b++); putc(' ', f); } } static unsigned long expand_and_crc_list(struct string_list *list, unsigned long crc) { struct string_list **e, **b; struct string_list *tmp, **tmp2; int elem = 1; if (!list) return crc; tmp = list; while((tmp = tmp->next) != NULL) elem++; b = alloca(elem * sizeof(*e)); e = b + elem; tmp2 = e - 1; *(tmp2--) = list; while ((list = list->next) != NULL) *(tmp2--) = list; while (b != e) { struct string_list *cur; struct symbol *subsym; cur = *(b++); switch (cur->tag) { case SYM_NORMAL: if (flag_dump_defs) fprintf(debugfile, "%s ", cur->string); crc = partial_crc32(cur->string, crc); crc = partial_crc32_one(' ', crc); break; case SYM_TYPEDEF: subsym = find_symbol(cur->string, cur->tag); if (subsym->expansion_trail) { if (flag_dump_defs) fprintf(debugfile, "%s ", cur->string); crc = partial_crc32(cur->string, crc); crc = partial_crc32_one(' ', crc); } else { subsym->expansion_trail = expansion_trail; expansion_trail = subsym; crc = expand_and_crc_list(subsym->defn, crc); } break; case SYM_STRUCT: case SYM_UNION: case SYM_ENUM: subsym = find_symbol(cur->string, cur->tag); if (!subsym) { struct string_list *n, *t = NULL; error_with_pos("expand undefined %s %s", symbol_type_name[cur->tag], cur->string); n = xmalloc(sizeof(*n)); n->string = xstrdup(symbol_type_name[cur->tag]); n->tag = SYM_NORMAL; n->next = t; t = n; n = xmalloc(sizeof(*n)); n->string = xstrdup(cur->string); n->tag = SYM_NORMAL; n->next = t; t = n; n = xmalloc(sizeof(*n)); n->string = xstrdup("{ UNKNOWN }"); n->tag = SYM_NORMAL; n->next = t; subsym = add_symbol(cur->string, cur->tag, n, 0); } if (subsym->expansion_trail) { if (flag_dump_defs) { fprintf(debugfile, "%s %s ", symbol_type_name[cur->tag], cur->string); } crc = partial_crc32(symbol_type_name[cur->tag], crc); crc = partial_crc32_one(' ', crc); crc = partial_crc32(cur->string, crc); crc = partial_crc32_one(' ', crc); } else { subsym->expansion_trail = expansion_trail; expansion_trail = subsym; crc = expand_and_crc_list(subsym->defn, crc); } break; } } return crc; } void export_symbol(const char *name) { struct symbol *sym; sym = find_symbol(name, SYM_NORMAL); if (!sym) error_with_pos("export undefined symbol %s", name); else { unsigned long crc; if (flag_dump_defs) fprintf(debugfile, "Export %s == <", name); expansion_trail = (struct symbol *)-1L; crc = expand_and_crc_list(sym->defn, 0xffffffff) ^ 0xffffffff; sym = expansion_trail; while (sym != (struct symbol *)-1L) { struct symbol *n = sym->expansion_trail; sym->expansion_trail = 0; sym = n; } if (flag_dump_defs) fputs(">\n", debugfile); /* Used as a linker script. */ printf("__crc_%s = 0x%08lx ;\n", name, crc); } } /*----------------------------------------------------------------------*/ void error(const char *fmt, ...) { va_list args; if (flag_warnings) { va_start(args, fmt); vfprintf(stderr, fmt, args); va_end(args); putc('\n', stderr); errors++; } } void error_with_pos(const char *fmt, ...) { va_list args; if (flag_warnings) { fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>", cur_line); va_start(args, fmt); vfprintf(stderr, fmt, args); va_end(args); putc('\n', stderr); errors++; } } void genksyms_usage(void) { fputs("Usage:\n" "genksyms [-dDwqhV] > /path/to/.tmp_obj.ver\n" "\n" #ifdef __GNU_LIBRARY__ " -d, --debug Increment the debug level (repeatable)\n" " -D, --dump Dump expanded symbol defs (for debugging only)\n" " -w, --warnings Enable warnings\n" " -q, --quiet Disable warnings (default)\n" " -h, --help Print this message\n" " -V, --version Print the release version\n" #else /* __GNU_LIBRARY__ */ " -d Increment the debug level (repeatable)\n" " -D Dump expanded symbol defs (for debugging only)\n" " -w Enable warnings\n" " -q Disable warnings (default)\n" " -h Print this message\n" " -V Print the release version\n" #endif /* __GNU_LIBRARY__ */ , stderr); } int main(int argc, char **argv) { int o; #ifdef __GNU_LIBRARY__ struct option long_opts[] = { {"debug", 0, 0, 'd'}, {"warnings", 0, 0, 'w'}, {"quiet", 0, 0, 'q'}, {"dump", 0, 0, 'D'}, {"version", 0, 0, 'V'}, {"help", 0, 0, 'h'}, {0, 0, 0, 0} }; while ((o = getopt_long(argc, argv, "dwqVDk:p:", &long_opts[0], NULL)) != EOF) #else /* __GNU_LIBRARY__ */ while ((o = getopt(argc, argv, "dwqVDk:p:")) != EOF) #endif /* __GNU_LIBRARY__ */ switch (o) { case 'd': flag_debug++; break; case 'w': flag_warnings = 1; break; case 'q': flag_warnings = 0; break; case 'V': fputs("genksyms version 2.5.60\n", stderr); break; case 'D': flag_dump_defs = 1; break; case 'h': genksyms_usage(); return 0; default: genksyms_usage(); return 1; } { extern int yydebug; extern int yy_flex_debug; yydebug = (flag_debug > 1); yy_flex_debug = (flag_debug > 2); debugfile = stderr; /* setlinebuf(debugfile); */ } yyparse(); if (flag_debug) { fprintf(debugfile, "Hash table occupancy %d/%d = %g\n", nsyms, HASH_BUCKETS, (double)nsyms / (double)HASH_BUCKETS); } return errors != 0; }