forked from mirrors/gecko-dev
a15c6351cb
Since bug 635961, building with relro makes elfhack try to use the bss data for a temporary function pointer. If there is not enough space for a pointer in the bss, elfhack will complain it couldn't find the bss. In normal circumstances, this is most likely fine. Libraries with a bss so small that it can't fit a pointer are already too small to be elfhacked anyways. In Firefox, the two libraries with the smallest bss have enough space for two pointers, and aren't elfhacked (libmozgtk.so and libplds4.so). However, the testcase that is used during the build to validate that elfhack works doesn't have a large enough bss on x86-64, making elfhack bail out, and the build fail as a consequence. This, in turn, is due to the only non-thread-local zeroed data being an int, which is not enough to fit a pointer on x86-64. We thus make it a size_t. --HG-- extra : rebase_source : bca2ddbf9d4a5e8786881fc524d642c38d610227
162 lines
2.8 KiB
C
162 lines
2.8 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifdef DEF
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DEF(This)
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DEF(is)
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DEF(a)
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DEF(test)
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DEF(of)
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DEF(string)
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DEF(array)
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DEF(for)
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DEF(use)
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DEF(with)
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DEF(elfhack)
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DEF(to)
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DEF(see)
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DEF(whether)
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DEF(it)
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DEF(breaks)
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DEF(anything)
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DEF(but)
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DEF(one)
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DEF(needs)
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DEF(quite)
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DEF(some)
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DEF(strings)
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DEF(before)
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DEF(the)
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DEF(program)
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DEF(can)
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DEF(do)
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DEF(its)
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DEF(work)
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DEF(efficiently)
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DEF(Without)
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DEF(enough)
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DEF(data)
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DEF(relocation)
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DEF(sections)
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DEF(are)
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DEF(not)
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DEF(sufficiently)
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DEF(large)
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DEF(and)
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DEF(injected)
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DEF(code)
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DEF(wouldnt)
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DEF(fit)
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DEF(Said)
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DEF(otherwise)
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DEF(we)
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DEF(need)
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DEF(more)
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DEF(words)
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DEF(than)
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DEF(up)
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DEF(here)
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DEF(so)
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DEF(that)
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DEF(relocations)
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DEF(take)
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DEF(significant)
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DEF(bytes)
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DEF(amounts)
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DEF(which)
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DEF(isnt)
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DEF(exactly)
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DEF(easily)
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DEF(achieved)
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DEF(like)
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DEF(this)
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DEF(Actually)
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DEF(I)
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DEF(must)
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DEF(cheat)
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DEF(by)
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DEF(including)
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DEF(these)
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DEF(phrases)
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DEF(several)
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DEF(times)
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#else
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#pragma GCC visibility push(default)
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#include <stdlib.h>
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#include <stdio.h>
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#define DEF(w) static const char str_ ## w[] = #w;
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#include "test.c"
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#undef DEF
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const char *strings[] = {
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#define DEF(w) str_ ## w,
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#include "test.c"
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#include "test.c"
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#include "test.c"
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};
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/* Create a hole between two zones of relative relocations */
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const int hole[] = {
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42, 42, 42, 42
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};
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const char *strings2[] = {
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#undef DEF
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};
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static int ret = 1;
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int print_status() {
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fprintf(stderr, "%s\n", ret ? "FAIL" : "PASS");
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return ret;
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}
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/* On ARM, this creates a .tbss section before .init_array, which
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* elfhack could then pick instead of .init_array.
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* Also, when .tbss is big enough, elfhack may wrongfully consider
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* following sections as part of the PT_TLS segment.
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* Finally, gold makes TLS segments end on an aligned virtual address,
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* even when the underlying section ends before that, and elfhack
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* sanity checks may yield an error. */
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__thread int foo;
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__thread long long int bar[512];
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void end_test() {
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static size_t count = 0;
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/* Only exit when both constructors have been called */
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if (++count == 2)
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ret = 0;
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}
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void test() {
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int i = 0, j = 0;
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#define DEF_(a,i,w) \
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if (a[i++] != str_ ## w) return;
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#define DEF(w) DEF_(strings,i,w)
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#undef DEF
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#define DEF(w) DEF_(strings2,j,w)
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#include "test.c"
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#undef DEF
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if (i != sizeof(strings)/sizeof(strings[0]) &&
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j != sizeof(strings2)/sizeof(strings2[0]))
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fprintf(stderr, "WARNING: Test doesn't cover the whole array\n");
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end_test();
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}
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#pragma GCC visibility pop
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#endif
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