773 lines
17 KiB
C
773 lines
17 KiB
C
/* Generate assembler source containing symbol information
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*
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* Copyright 2002 by Kai Germaschewski
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* Usage: nm -n vmlinux | scripts/kallsyms [--all-symbols] > symbols.S
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*
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* Table compression uses all the unused char codes on the symbols and
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* maps these to the most used substrings (tokens). For instance, it might
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* map char code 0xF7 to represent "write_" and then in every symbol where
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* "write_" appears it can be replaced by 0xF7, saving 5 bytes.
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* The used codes themselves are also placed in the table so that the
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* decompresion can work without "special cases".
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* Applied to kernel symbols, this usually produces a compression ratio
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* of about 50%.
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*
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <limits.h>
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
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#define KSYM_NAME_LEN 128
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struct sym_entry {
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unsigned long long addr;
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unsigned int len;
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unsigned int start_pos;
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unsigned int percpu_absolute;
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unsigned char sym[0];
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};
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struct addr_range {
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const char *start_sym, *end_sym;
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unsigned long long start, end;
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};
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static unsigned long long _text;
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static unsigned long long relative_base;
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static struct addr_range text_ranges[] = {
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{ "_stext", "_etext" },
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{ "_sinittext", "_einittext" },
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};
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#define text_range_text (&text_ranges[0])
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#define text_range_inittext (&text_ranges[1])
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static struct addr_range percpu_range = {
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"__per_cpu_start", "__per_cpu_end", -1ULL, 0
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};
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static struct sym_entry **table;
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static unsigned int table_size, table_cnt;
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static int all_symbols;
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static int absolute_percpu;
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static int base_relative;
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static int token_profit[0x10000];
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/* the table that holds the result of the compression */
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static unsigned char best_table[256][2];
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static unsigned char best_table_len[256];
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static void usage(void)
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{
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fprintf(stderr, "Usage: kallsyms [--all-symbols] "
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"[--base-relative] < in.map > out.S\n");
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exit(1);
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}
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static char *sym_name(const struct sym_entry *s)
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{
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return (char *)s->sym + 1;
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}
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static bool is_ignored_symbol(const char *name, char type)
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{
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static const char * const ignored_symbols[] = {
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/*
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* Symbols which vary between passes. Passes 1 and 2 must have
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* identical symbol lists. The kallsyms_* symbols below are
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* only added after pass 1, they would be included in pass 2
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* when --all-symbols is specified so exclude them to get a
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* stable symbol list.
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*/
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"kallsyms_addresses",
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"kallsyms_offsets",
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"kallsyms_relative_base",
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"kallsyms_num_syms",
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"kallsyms_names",
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"kallsyms_markers",
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"kallsyms_token_table",
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"kallsyms_token_index",
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/* Exclude linker generated symbols which vary between passes */
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"_SDA_BASE_", /* ppc */
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"_SDA2_BASE_", /* ppc */
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NULL
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};
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static const char * const ignored_prefixes[] = {
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"$", /* local symbols for ARM, MIPS, etc. */
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".LASANPC", /* s390 kasan local symbols */
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"__crc_", /* modversions */
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"__efistub_", /* arm64 EFI stub namespace */
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NULL
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};
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static const char * const ignored_suffixes[] = {
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"_from_arm", /* arm */
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"_from_thumb", /* arm */
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"_veneer", /* arm */
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NULL
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};
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const char * const *p;
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/* Exclude symbols which vary between passes. */
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for (p = ignored_symbols; *p; p++)
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if (!strcmp(name, *p))
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return true;
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for (p = ignored_prefixes; *p; p++)
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if (!strncmp(name, *p, strlen(*p)))
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return true;
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for (p = ignored_suffixes; *p; p++) {
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int l = strlen(name) - strlen(*p);
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if (l >= 0 && !strcmp(name + l, *p))
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return true;
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}
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if (type == 'U' || type == 'u')
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return true;
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/* exclude debugging symbols */
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if (type == 'N' || type == 'n')
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return true;
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if (toupper(type) == 'A') {
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/* Keep these useful absolute symbols */
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if (strcmp(name, "__kernel_syscall_via_break") &&
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strcmp(name, "__kernel_syscall_via_epc") &&
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strcmp(name, "__kernel_sigtramp") &&
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strcmp(name, "__gp"))
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return true;
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}
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return false;
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}
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static void check_symbol_range(const char *sym, unsigned long long addr,
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struct addr_range *ranges, int entries)
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{
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size_t i;
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struct addr_range *ar;
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for (i = 0; i < entries; ++i) {
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ar = &ranges[i];
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if (strcmp(sym, ar->start_sym) == 0) {
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ar->start = addr;
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return;
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} else if (strcmp(sym, ar->end_sym) == 0) {
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ar->end = addr;
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return;
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}
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}
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}
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static struct sym_entry *read_symbol(FILE *in)
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{
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char name[500], type;
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unsigned long long addr;
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unsigned int len;
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struct sym_entry *sym;
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int rc;
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rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
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if (rc != 3) {
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if (rc != EOF && fgets(name, 500, in) == NULL)
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fprintf(stderr, "Read error or end of file.\n");
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return NULL;
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}
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if (strlen(name) >= KSYM_NAME_LEN) {
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fprintf(stderr, "Symbol %s too long for kallsyms (%zu >= %d).\n"
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"Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
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name, strlen(name), KSYM_NAME_LEN);
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return NULL;
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}
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if (is_ignored_symbol(name, type))
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return NULL;
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/* Ignore most absolute/undefined (?) symbols. */
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if (strcmp(name, "_text") == 0)
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_text = addr;
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check_symbol_range(name, addr, text_ranges, ARRAY_SIZE(text_ranges));
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check_symbol_range(name, addr, &percpu_range, 1);
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/* include the type field in the symbol name, so that it gets
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* compressed together */
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len = strlen(name) + 1;
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sym = malloc(sizeof(*sym) + len + 1);
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if (!sym) {
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fprintf(stderr, "kallsyms failure: "
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"unable to allocate required amount of memory\n");
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exit(EXIT_FAILURE);
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}
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sym->addr = addr;
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sym->len = len;
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sym->sym[0] = type;
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strcpy(sym_name(sym), name);
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sym->percpu_absolute = 0;
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return sym;
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}
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static int symbol_in_range(const struct sym_entry *s,
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const struct addr_range *ranges, int entries)
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{
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size_t i;
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const struct addr_range *ar;
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for (i = 0; i < entries; ++i) {
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ar = &ranges[i];
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if (s->addr >= ar->start && s->addr <= ar->end)
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return 1;
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}
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return 0;
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}
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static int symbol_valid(const struct sym_entry *s)
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{
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const char *name = sym_name(s);
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/* if --all-symbols is not specified, then symbols outside the text
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* and inittext sections are discarded */
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if (!all_symbols) {
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if (symbol_in_range(s, text_ranges,
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ARRAY_SIZE(text_ranges)) == 0)
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return 0;
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/* Corner case. Discard any symbols with the same value as
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* _etext _einittext; they can move between pass 1 and 2 when
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* the kallsyms data are added. If these symbols move then
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* they may get dropped in pass 2, which breaks the kallsyms
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* rules.
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*/
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if ((s->addr == text_range_text->end &&
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strcmp(name, text_range_text->end_sym)) ||
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(s->addr == text_range_inittext->end &&
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strcmp(name, text_range_inittext->end_sym)))
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return 0;
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}
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return 1;
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}
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/* remove all the invalid symbols from the table */
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static void shrink_table(void)
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{
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unsigned int i, pos;
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pos = 0;
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for (i = 0; i < table_cnt; i++) {
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if (symbol_valid(table[i])) {
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if (pos != i)
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table[pos] = table[i];
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pos++;
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} else {
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free(table[i]);
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}
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}
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table_cnt = pos;
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/* When valid symbol is not registered, exit to error */
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if (!table_cnt) {
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fprintf(stderr, "No valid symbol.\n");
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exit(1);
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}
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}
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static void read_map(FILE *in)
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{
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struct sym_entry *sym;
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while (!feof(in)) {
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sym = read_symbol(in);
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if (!sym)
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continue;
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sym->start_pos = table_cnt;
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if (table_cnt >= table_size) {
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table_size += 10000;
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table = realloc(table, sizeof(*table) * table_size);
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if (!table) {
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fprintf(stderr, "out of memory\n");
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exit (1);
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}
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}
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table[table_cnt++] = sym;
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}
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}
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static void output_label(const char *label)
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{
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printf(".globl %s\n", label);
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printf("\tALGN\n");
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printf("%s:\n", label);
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}
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/* Provide proper symbols relocatability by their '_text' relativeness. */
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static void output_address(unsigned long long addr)
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{
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if (_text <= addr)
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printf("\tPTR\t_text + %#llx\n", addr - _text);
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else
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printf("\tPTR\t_text - %#llx\n", _text - addr);
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}
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/* uncompress a compressed symbol. When this function is called, the best table
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* might still be compressed itself, so the function needs to be recursive */
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static int expand_symbol(const unsigned char *data, int len, char *result)
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{
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int c, rlen, total=0;
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while (len) {
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c = *data;
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/* if the table holds a single char that is the same as the one
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* we are looking for, then end the search */
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if (best_table[c][0]==c && best_table_len[c]==1) {
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*result++ = c;
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total++;
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} else {
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/* if not, recurse and expand */
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rlen = expand_symbol(best_table[c], best_table_len[c], result);
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total += rlen;
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result += rlen;
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}
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data++;
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len--;
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}
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*result=0;
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return total;
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}
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static int symbol_absolute(const struct sym_entry *s)
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{
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return s->percpu_absolute;
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}
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static void write_src(void)
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{
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unsigned int i, k, off;
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unsigned int best_idx[256];
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unsigned int *markers;
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char buf[KSYM_NAME_LEN];
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printf("#include <asm/bitsperlong.h>\n");
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printf("#if BITS_PER_LONG == 64\n");
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printf("#define PTR .quad\n");
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printf("#define ALGN .balign 8\n");
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printf("#else\n");
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printf("#define PTR .long\n");
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printf("#define ALGN .balign 4\n");
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printf("#endif\n");
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printf("\t.section .rodata, \"a\"\n");
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if (!base_relative)
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output_label("kallsyms_addresses");
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else
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output_label("kallsyms_offsets");
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for (i = 0; i < table_cnt; i++) {
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if (base_relative) {
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/*
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* Use the offset relative to the lowest value
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* encountered of all relative symbols, and emit
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* non-relocatable fixed offsets that will be fixed
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* up at runtime.
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*/
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long long offset;
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int overflow;
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if (!absolute_percpu) {
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offset = table[i]->addr - relative_base;
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overflow = (offset < 0 || offset > UINT_MAX);
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} else if (symbol_absolute(table[i])) {
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offset = table[i]->addr;
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overflow = (offset < 0 || offset > INT_MAX);
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} else {
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offset = relative_base - table[i]->addr - 1;
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overflow = (offset < INT_MIN || offset >= 0);
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}
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if (overflow) {
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fprintf(stderr, "kallsyms failure: "
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"%s symbol value %#llx out of range in relative mode\n",
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symbol_absolute(table[i]) ? "absolute" : "relative",
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table[i]->addr);
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exit(EXIT_FAILURE);
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}
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printf("\t.long\t%#x\n", (int)offset);
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} else if (!symbol_absolute(table[i])) {
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output_address(table[i]->addr);
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} else {
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printf("\tPTR\t%#llx\n", table[i]->addr);
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}
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}
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printf("\n");
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if (base_relative) {
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output_label("kallsyms_relative_base");
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output_address(relative_base);
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printf("\n");
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}
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output_label("kallsyms_num_syms");
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printf("\t.long\t%u\n", table_cnt);
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printf("\n");
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/* table of offset markers, that give the offset in the compressed stream
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* every 256 symbols */
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markers = malloc(sizeof(unsigned int) * ((table_cnt + 255) / 256));
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if (!markers) {
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fprintf(stderr, "kallsyms failure: "
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"unable to allocate required memory\n");
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exit(EXIT_FAILURE);
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}
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output_label("kallsyms_names");
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off = 0;
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for (i = 0; i < table_cnt; i++) {
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if ((i & 0xFF) == 0)
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markers[i >> 8] = off;
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printf("\t.byte 0x%02x", table[i]->len);
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for (k = 0; k < table[i]->len; k++)
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printf(", 0x%02x", table[i]->sym[k]);
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printf("\n");
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off += table[i]->len + 1;
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}
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printf("\n");
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output_label("kallsyms_markers");
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for (i = 0; i < ((table_cnt + 255) >> 8); i++)
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printf("\t.long\t%u\n", markers[i]);
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printf("\n");
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free(markers);
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output_label("kallsyms_token_table");
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off = 0;
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for (i = 0; i < 256; i++) {
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best_idx[i] = off;
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expand_symbol(best_table[i], best_table_len[i], buf);
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printf("\t.asciz\t\"%s\"\n", buf);
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off += strlen(buf) + 1;
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}
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printf("\n");
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output_label("kallsyms_token_index");
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for (i = 0; i < 256; i++)
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printf("\t.short\t%d\n", best_idx[i]);
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printf("\n");
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}
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/* table lookup compression functions */
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/* count all the possible tokens in a symbol */
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static void learn_symbol(const unsigned char *symbol, int len)
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{
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int i;
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for (i = 0; i < len - 1; i++)
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token_profit[ symbol[i] + (symbol[i + 1] << 8) ]++;
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}
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/* decrease the count for all the possible tokens in a symbol */
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static void forget_symbol(const unsigned char *symbol, int len)
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{
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int i;
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for (i = 0; i < len - 1; i++)
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token_profit[ symbol[i] + (symbol[i + 1] << 8) ]--;
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}
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/* do the initial token count */
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static void build_initial_tok_table(void)
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{
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unsigned int i;
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for (i = 0; i < table_cnt; i++)
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learn_symbol(table[i]->sym, table[i]->len);
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}
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static unsigned char *find_token(unsigned char *str, int len,
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const unsigned char *token)
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{
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int i;
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for (i = 0; i < len - 1; i++) {
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if (str[i] == token[0] && str[i+1] == token[1])
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return &str[i];
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}
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return NULL;
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}
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/* replace a given token in all the valid symbols. Use the sampled symbols
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* to update the counts */
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static void compress_symbols(const unsigned char *str, int idx)
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{
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unsigned int i, len, size;
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unsigned char *p1, *p2;
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for (i = 0; i < table_cnt; i++) {
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len = table[i]->len;
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p1 = table[i]->sym;
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/* find the token on the symbol */
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p2 = find_token(p1, len, str);
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if (!p2) continue;
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/* decrease the counts for this symbol's tokens */
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forget_symbol(table[i]->sym, len);
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size = len;
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do {
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*p2 = idx;
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p2++;
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size -= (p2 - p1);
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memmove(p2, p2 + 1, size);
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|
p1 = p2;
|
|
len--;
|
|
|
|
if (size < 2) break;
|
|
|
|
/* find the token on the symbol */
|
|
p2 = find_token(p1, size, str);
|
|
|
|
} while (p2);
|
|
|
|
table[i]->len = len;
|
|
|
|
/* increase the counts for this symbol's new tokens */
|
|
learn_symbol(table[i]->sym, len);
|
|
}
|
|
}
|
|
|
|
/* search the token with the maximum profit */
|
|
static int find_best_token(void)
|
|
{
|
|
int i, best, bestprofit;
|
|
|
|
bestprofit=-10000;
|
|
best = 0;
|
|
|
|
for (i = 0; i < 0x10000; i++) {
|
|
if (token_profit[i] > bestprofit) {
|
|
best = i;
|
|
bestprofit = token_profit[i];
|
|
}
|
|
}
|
|
return best;
|
|
}
|
|
|
|
/* this is the core of the algorithm: calculate the "best" table */
|
|
static void optimize_result(void)
|
|
{
|
|
int i, best;
|
|
|
|
/* using the '\0' symbol last allows compress_symbols to use standard
|
|
* fast string functions */
|
|
for (i = 255; i >= 0; i--) {
|
|
|
|
/* if this table slot is empty (it is not used by an actual
|
|
* original char code */
|
|
if (!best_table_len[i]) {
|
|
|
|
/* find the token with the best profit value */
|
|
best = find_best_token();
|
|
if (token_profit[best] == 0)
|
|
break;
|
|
|
|
/* place it in the "best" table */
|
|
best_table_len[i] = 2;
|
|
best_table[i][0] = best & 0xFF;
|
|
best_table[i][1] = (best >> 8) & 0xFF;
|
|
|
|
/* replace this token in all the valid symbols */
|
|
compress_symbols(best_table[i], i);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* start by placing the symbols that are actually used on the table */
|
|
static void insert_real_symbols_in_table(void)
|
|
{
|
|
unsigned int i, j, c;
|
|
|
|
for (i = 0; i < table_cnt; i++) {
|
|
for (j = 0; j < table[i]->len; j++) {
|
|
c = table[i]->sym[j];
|
|
best_table[c][0]=c;
|
|
best_table_len[c]=1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void optimize_token_table(void)
|
|
{
|
|
build_initial_tok_table();
|
|
|
|
insert_real_symbols_in_table();
|
|
|
|
optimize_result();
|
|
}
|
|
|
|
/* guess for "linker script provide" symbol */
|
|
static int may_be_linker_script_provide_symbol(const struct sym_entry *se)
|
|
{
|
|
const char *symbol = sym_name(se);
|
|
int len = se->len - 1;
|
|
|
|
if (len < 8)
|
|
return 0;
|
|
|
|
if (symbol[0] != '_' || symbol[1] != '_')
|
|
return 0;
|
|
|
|
/* __start_XXXXX */
|
|
if (!memcmp(symbol + 2, "start_", 6))
|
|
return 1;
|
|
|
|
/* __stop_XXXXX */
|
|
if (!memcmp(symbol + 2, "stop_", 5))
|
|
return 1;
|
|
|
|
/* __end_XXXXX */
|
|
if (!memcmp(symbol + 2, "end_", 4))
|
|
return 1;
|
|
|
|
/* __XXXXX_start */
|
|
if (!memcmp(symbol + len - 6, "_start", 6))
|
|
return 1;
|
|
|
|
/* __XXXXX_end */
|
|
if (!memcmp(symbol + len - 4, "_end", 4))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int compare_symbols(const void *a, const void *b)
|
|
{
|
|
const struct sym_entry *sa = *(const struct sym_entry **)a;
|
|
const struct sym_entry *sb = *(const struct sym_entry **)b;
|
|
int wa, wb;
|
|
|
|
/* sort by address first */
|
|
if (sa->addr > sb->addr)
|
|
return 1;
|
|
if (sa->addr < sb->addr)
|
|
return -1;
|
|
|
|
/* sort by "weakness" type */
|
|
wa = (sa->sym[0] == 'w') || (sa->sym[0] == 'W');
|
|
wb = (sb->sym[0] == 'w') || (sb->sym[0] == 'W');
|
|
if (wa != wb)
|
|
return wa - wb;
|
|
|
|
/* sort by "linker script provide" type */
|
|
wa = may_be_linker_script_provide_symbol(sa);
|
|
wb = may_be_linker_script_provide_symbol(sb);
|
|
if (wa != wb)
|
|
return wa - wb;
|
|
|
|
/* sort by the number of prefix underscores */
|
|
wa = strspn(sym_name(sa), "_");
|
|
wb = strspn(sym_name(sb), "_");
|
|
if (wa != wb)
|
|
return wa - wb;
|
|
|
|
/* sort by initial order, so that other symbols are left undisturbed */
|
|
return sa->start_pos - sb->start_pos;
|
|
}
|
|
|
|
static void sort_symbols(void)
|
|
{
|
|
qsort(table, table_cnt, sizeof(table[0]), compare_symbols);
|
|
}
|
|
|
|
static void make_percpus_absolute(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < table_cnt; i++)
|
|
if (symbol_in_range(table[i], &percpu_range, 1)) {
|
|
/*
|
|
* Keep the 'A' override for percpu symbols to
|
|
* ensure consistent behavior compared to older
|
|
* versions of this tool.
|
|
*/
|
|
table[i]->sym[0] = 'A';
|
|
table[i]->percpu_absolute = 1;
|
|
}
|
|
}
|
|
|
|
/* find the minimum non-absolute symbol address */
|
|
static void record_relative_base(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < table_cnt; i++)
|
|
if (!symbol_absolute(table[i])) {
|
|
/*
|
|
* The table is sorted by address.
|
|
* Take the first non-absolute symbol value.
|
|
*/
|
|
relative_base = table[i]->addr;
|
|
return;
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if (argc >= 2) {
|
|
int i;
|
|
for (i = 1; i < argc; i++) {
|
|
if(strcmp(argv[i], "--all-symbols") == 0)
|
|
all_symbols = 1;
|
|
else if (strcmp(argv[i], "--absolute-percpu") == 0)
|
|
absolute_percpu = 1;
|
|
else if (strcmp(argv[i], "--base-relative") == 0)
|
|
base_relative = 1;
|
|
else
|
|
usage();
|
|
}
|
|
} else if (argc != 1)
|
|
usage();
|
|
|
|
read_map(stdin);
|
|
shrink_table();
|
|
if (absolute_percpu)
|
|
make_percpus_absolute();
|
|
sort_symbols();
|
|
if (base_relative)
|
|
record_relative_base();
|
|
optimize_token_table();
|
|
write_src();
|
|
|
|
return 0;
|
|
}
|