diff options
Diffstat (limited to 'scripts/genksyms/genksyms.c')
-rw-r--r-- | scripts/genksyms/genksyms.c | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c new file mode 100644 index 0000000..416a694 --- /dev/null +++ b/scripts/genksyms/genksyms.c @@ -0,0 +1,591 @@ +/* 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; +} |