target/linux/generic/patches-4.9/203-kallsyms_uncompressed.patch

   1 --- a/scripts/kallsyms.c
   2 +++ b/scripts/kallsyms.c
   3 @@ -61,6 +61,7 @@ static struct addr_range percpu_range =
   4  static struct sym_entry *table;
   5  static unsigned int table_size, table_cnt;
   6  static int all_symbols = 0;
   7 +static int uncompressed = 0;
   8  static int absolute_percpu = 0;
   9  static char symbol_prefix_char = '\0';
  10  static int base_relative = 0;
  11 @@ -446,6 +447,9 @@ static void write_src(void)
  12
  13         free(markers);
  14
  15 +       if (uncompressed)
  16 +               return;
  17 +
  18         output_label("kallsyms_token_table");
  19         off = 0;
  20         for (i = 0; i < 256; i++) {
  21 @@ -504,6 +508,9 @@ static void *find_token(unsigned char *s
  22  {
  23         int i;
  24
  25 +       if (uncompressed)
  26 +               return NULL;
  27 +
  28         for (i = 0; i < len - 1; i++) {
  29                 if (str[i] == token[0] && str[i+1] == token[1])
  30                         return &str[i];
  31 @@ -576,6 +583,9 @@ static void optimize_result(void)
  32  {
  33         int i, best;
  34
  35 +       if (uncompressed)
  36 +               return;
  37 +
  38         /* using the '\0' symbol last allows compress_symbols to use standard
  39          * fast string functions */
  40         for (i = 255; i >= 0; i--) {
  41 @@ -764,6 +774,8 @@ int main(int argc, char **argv)
  42                                 symbol_prefix_char = *p;
  43                         } else if (strcmp(argv[i], "--base-relative") == 0)
  44                                 base_relative = 1;
  45 +                       else if (strcmp(argv[i], "--uncompressed") == 0)
  46 +                               uncompressed = 1;
  47                         else
  48                                 usage();
  49                 }
  50 --- a/init/Kconfig
  51 +++ b/init/Kconfig
  52 @@ -1370,6 +1370,17 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
  53           the unaligned access emulation.
  54           see arch/parisc/kernel/unaligned.c for reference
  55
  56 +config KALLSYMS_UNCOMPRESSED
  57 +       bool "Keep kallsyms uncompressed"
  58 +       depends on KALLSYMS
  59 +       help
  60 +               Normally kallsyms contains compressed symbols (using a token table),
  61 +               reducing the uncompressed kernel image size. Keeping the symbol table
  62 +               uncompressed significantly improves the size of this part in compressed
  63 +               kernel images.
  64 +
  65 +               Say N unless you need compressed kernel images to be small.
  66 +
  67  config HAVE_PCSPKR_PLATFORM
  68         bool
  69
  70 --- a/scripts/link-vmlinux.sh
  71 +++ b/scripts/link-vmlinux.sh
  72 @@ -136,6 +136,10 @@ kallsyms()
  73                 kallsymopt="${kallsymopt} --base-relative"
  74         fi
  75
  76 +       if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
  77 +               kallsymopt="${kallsymopt} --uncompressed"
  78 +       fi
  79 +
  80         local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
  81                       ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
  82
  83 --- a/kernel/kallsyms.c
  84 +++ b/kernel/kallsyms.c
  85 @@ -113,6 +113,11 @@ static unsigned int kallsyms_expand_symb
  86          * For every byte on the compressed symbol data, copy the table
  87          * entry for that byte.
  88          */
  89 +#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
  90 +       memcpy(result, data + 1, len - 1);
  91 +       result += len - 1;
  92 +       len = 0;
  93 +#endif
  94         while (len) {
  95                 tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
  96                 data++;
  97 @@ -145,6 +150,9 @@ tail:
  98   */
  99  static char kallsyms_get_symbol_type(unsigned int off)
 100  {
 101 +#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
 102 +       return kallsyms_names[off + 1];
 103 +#endif
 104         /*
 105          * Get just the first code, look it up in the token table,
 106          * and return the first char from this token.