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|
# Read the symbols list and create regexs to use for processing readelf output.
BEGIN {
sym_regex = "";
while ((getline line < SYMBOLS_FILE) > 0) {
if (line ~ /^ *#/ || line ~ /^$/)
continue;
split(line, fields);
symbol = fields[1];
if (sym_regex)
sym_regex = sym_regex "|";
sym_regex = sym_regex symbol;
}
SYMBOL_REGEX = "^(" sym_regex ")(@|$)";
WEAK_SYMBOL_REGEX = "^__(" sym_regx ")(@@|$)";
}
/^ OS\/ABI:/ {
ABI = $NF
}
{
# Unstripped libc's have '.symtab' section as well, and
# we should stop processing when we hit that
if ($0 ~ "^Symbol (.*)table '.symtab'")
nextfile;
# Only check FUNCtion symbols which are not LOCAL, or
# do not have DEFAULT visibility
if ($4 != "FUNC" || $5 == "LOCAL" || $6 != "DEFAULT")
next;
# On x86, x86_64 and others, $8 is the symbol name, but on
# alpha, its $10, so rather use $NF, as it should be the
# last field
if ($NF ~ SYMBOL_REGEX) {
split($NF, symbol_array, /@|@@/);
# Don't add local symbols of versioned libc's
if (VERSIONED_LIBC && !symbol_array[2])
next;
# Handle non-versioned libc's like uClibc ...
if (!symbol_array[2])
symbol_array[2] = "";
# We have a versioned libc
if (symbol_array[2] && !VERSIONED_LIBC)
VERSIONED_LIBC = 1;
ADD = 1;
# Check that we do not add duplicates
for (y in PROCESSED_SYMBOLS) {
if (y == $NF) {
ADD = 0;
break;
}
}
if (ADD) {
SYMBOL_LIST[symbol_array[2]] = SYMBOL_LIST[symbol_array[2]] " " symbol_array[1];
PROCESSED_SYMBOLS[$NF] = $NF;
}
}
# No apparent need to handle weak __XXX symbols ... so disable
# until we have documentation on why ...
# If we do re-add this, need to update the `readelf` call in
# libsandbox/ to include the -h flag again.
next;
if (($5 == "WEAK") && ($NF ~ WEAK_SYMBOL_REGEX)) {
split($NF, symbol_array, /@@/);
# Don't add local symbols of versioned libc's
if (VERSIONED_LIBC && !symbol_array[2])
next;
# Blacklist __getcwd on FreeBSD
# Unleashed - May 2006
if ((symbol_array[1] == "__getcwd") && (ABI == "FreeBSD"))
next;
# Handle non-versioned libc's like uClibc ...
if (!symbol_array[2])
symbol_array[2] = "";
# We have a versioned libc
if (symbol_array[2] && !VERSIONED_LIBC)
VERSIONED_LIBC = 1;
ADD = 1;
# Check that we do not add duplicates
for (y in PROCESSED_SYMBOLS) {
if (y == $NF) {
ADD = 0;
break;
}
}
if (ADD) {
SYMBOL_LIST[symbol_array[2]] = SYMBOL_LIST[symbol_array[2]] " " symbol_array[1];
PROCESSED_SYMBOLS[$NF] = $NF;
}
}
}
END {
COUNT = 0;
delete VERSION_LIST
for (sym_version in SYMBOL_LIST)
if (sym_version)
VERSION_LIST[COUNT++] = sym_version;
# We need the symbol versions sorted alphabetically ...
if (COUNT)
asort(VERSION_LIST);
else
# Handle non-versioned libc's like uClibc ...
COUNT = 1;
for (i = 1; i <= COUNT; ++i) {
if (VERSION_LIST[i]) {
sym_version = VERSION_LIST[i];
printf("%s {\n", sym_version);
} else {
# Handle non-versioned libc's like uClibc ...
sym_version = "";
printf("{\n");
}
printf("\tglobal:\n");
split(SYMBOL_LIST[sym_version], sym_names);
for (x in sym_names)
printf("\t\t%s;\n", sym_names[x]);
if (!old_sym_version) {
printf("\tlocal:\n");
printf("\t\t*;\n");
printf("};\n");
} else
printf("} %s;\n", old_sym_version);
printf("\n");
old_sym_version = sym_version;
}
}
|
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