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commit 02657da2cf4457804ed938ee08b8316249126444
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date: Tue Sep 16 22:19:22 2014 +0530
Include .interp section only for libc.so
Barring libc.so and libdl.so, none of the libraries have any entry
points, so it is pointless to add a .interp section for them. The
libdl.so entry point (in dlfcn/eval.c) is also defunct, so remove that
file as well.
Build tested for x86_64, ppc64 and s390x. I have not moved
CFLAGS-interp.c to CPPFLAGS-interp.c isnce I'll be removing it
completely in a follow-up patch.
Siddhesh
* Makerules (lib%.so): Don't include $(+interp) in
prerequisites.
* elf/Makefile (CFLAGS-interp.c): Don't define NOT_IN_libc.
* dlfcn/eval.c: Remove file.
Index: glibc-2.17-c758a686/Makerules
===================================================================
--- glibc-2.17-c758a686.orig/Makerules
+++ glibc-2.17-c758a686/Makerules
@@ -461,7 +461,7 @@ link-libc-deps = $(common-objpfx)libc.so
# build shared libraries in place from the installed *_pic.a files.
# $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
# on other shared objects.
-lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp)
+lib%.so: lib%_pic.a $(+preinit) $(+postinit)
$(build-shlib)
define build-shlib-helper
Index: glibc-2.17-c758a686/dlfcn/eval.c
===================================================================
--- glibc-2.17-c758a686.orig/dlfcn/eval.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/* You don't really want to know what this hack is for.
- Copyright (C) 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <assert.h>
-#include <ctype.h>
-#include <dlfcn.h>
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-static void *funcall (char **stringp) __attribute_noinline__;
-static void *eval (char **stringp);
-
-
-long int weak_function
-__strtol_internal (const char *nptr, char **endptr, int base, int group)
-{
- unsigned long int result = 0;
- long int sign = 1;
-
- while (*nptr == ' ' || *nptr == '\t')
- ++nptr;
-
- if (*nptr == '-')
- {
- sign = -1;
- ++nptr;
- }
- else if (*nptr == '+')
- ++nptr;
-
- if (*nptr < '0' || *nptr > '9')
- {
- if (endptr != NULL)
- *endptr = (char *) nptr;
- return 0L;
- }
-
- assert (base == 0);
- base = 10;
- if (*nptr == '0')
- {
- if (nptr[1] == 'x' || nptr[1] == 'X')
- {
- base = 16;
- nptr += 2;
- }
- else
- base = 8;
- }
-
- while (*nptr >= '0' && *nptr <= '9')
- {
- unsigned long int digval = *nptr - '0';
- if (result > LONG_MAX / 10
- || (sign > 0 ? result == LONG_MAX / 10 && digval > LONG_MAX % 10
- : (result == ((unsigned long int) LONG_MAX + 1) / 10
- && digval > ((unsigned long int) LONG_MAX + 1) % 10)))
- {
- errno = ERANGE;
- return sign > 0 ? LONG_MAX : LONG_MIN;
- }
- result *= base;
- result += digval;
- ++nptr;
- }
-
- return (long int) result * sign;
-}
-
-
-static void *
-funcall (char **stringp)
-{
- void *args[strlen (*stringp)], **ap = args;
- void *argcookie = &args[1];
-
- do
- {
- /* Evaluate the next token. */
- *ap++ = eval (stringp);
-
- /* Whitespace is irrelevant. */
- while (isspace (**stringp))
- ++*stringp;
-
- /* Terminate at closing paren or end of line. */
- } while (**stringp != '\0' && **stringp != ')');
- if (**stringp != '\0')
- /* Swallow closing paren. */
- ++*stringp;
-
- if (args[0] == NULL)
- {
- static const char unknown[] = "Unknown function\n";
- write (1, unknown, sizeof unknown - 1);
- return NULL;
- }
-
- /* Do it to it. */
- __builtin_return (__builtin_apply (args[0],
- &argcookie,
- (char *) ap - (char *) &args[1]));
-}
-
-static void *
-eval (char **stringp)
-{
- void *value;
- char *p = *stringp, c;
-
- /* Whitespace is irrelevant. */
- while (isspace (*p))
- ++p;
-
- switch (*p)
- {
- case '"':
- /* String constant. */
- value = ++p;
- do
- if (*p == '\\')
- {
- switch (*strcpy (p, p + 1))
- {
- case 't':
- *p = '\t';
- break;
- case 'n':
- *p = '\n';
- break;
- }
- ++p;
- }
- while (*p != '\0' && *p++ != '"');
- if (p[-1] == '"')
- p[-1] = '\0';
- break;
-
- case '(':
- *stringp = ++p;
- return funcall (stringp);
-
- default:
- /* Try to parse it as a number. */
- value = (void *) __strtol_internal (p, stringp, 0, 0);
- if (*stringp != p)
- return value;
-
- /* Anything else is a symbol that produces its address. */
- value = p;
- do
- ++p;
- while (*p != '\0' && !isspace (*p) && (!ispunct (*p) || *p == '_'));
- c = *p;
- *p = '\0';
- value = dlsym (NULL, value);
- *p = c;
- break;
- }
-
- *stringp = p;
- return value;
-}
-
-
-extern void _start (void) __attribute__ ((noreturn));
-void
-__attribute__ ((noreturn))
-_start (void)
-{
- char *buf = NULL;
- size_t bufsz = 0;
-
- while (__getdelim (&buf, &bufsz, '\n', stdin) > 0)
- {
- char *p = buf;
- eval (&p);
- }
-
- exit (0);
-}
Index: glibc-2.17-c758a686/elf/Makefile
===================================================================
--- glibc-2.17-c758a686.orig/elf/Makefile
+++ glibc-2.17-c758a686/elf/Makefile
@@ -345,8 +345,7 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld
| $(AWK) '($$7 ~ /^UND(|EF)$$/ && $$1 != "0:" && $$4 != "REGISTER") { print; p=1 } END { exit p != 0 }'
# interp.c exists just to get this string into the libraries.
-CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"' \
- -DNOT_IN_libc=1
+CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"'
$(objpfx)interp.os: $(common-objpfx)config.make
ifneq (ld.so,$(rtld-installed-name))