This is backport from 2.21 branch Upstream-Status: Backport Signed-off-by: Khem Raj commit 946593d19f203b02efd45b5102dd2787d9418e24 Author: H.J. Lu Date: Wed May 25 17:41:32 2011 +0000 Handle STT_GNU_IFUNC symols when building shared library. bfd/ 2012-05-25 H.J. Lu Backport from mainline 2012-01-06 H.J. Lu PR ld/12366 PR ld/12371 * elf-ifunc.c (_bfd_elf_allocate_ifunc_dyn_relocs): Properly handle symbols marked with regular reference, but not non-GOT reference when building shared library. * elf32-i386.c (elf_i386_gc_sweep_hook): Properly handle local and global STT_GNU_IFUNC symols when building shared library. * elf64-x86-64.c (elf_x86_64_gc_sweep_hook): Likewise. ld/testsuite/ 2012-05-25 H.J. Lu Backport from mainline 2012-01-06 H.J. Lu PR ld/12366 PR ld/12371 * ld-ifunc/ifunc-10-i386.s: Add more tests. * ld-ifunc/ifunc-10-x86-64.s: Likewise. * ld-ifunc/ifunc-11-i386.s: Likewise. * ld-ifunc/ifunc-11-x86-64.s: Likewise. * ld-ifunc/ifunc-12-i386.d: New. * ld-ifunc/ifunc-12-i386.s: Likewise. * ld-ifunc/ifunc-12-x86-64.d: Likewise. * ld-ifunc/ifunc-12-x86-64.s: Likewise. * ld-ifunc/ifunc-13-i386.d: Likewise. * ld-ifunc/ifunc-13-x86-64.d: Likewise. * ld-ifunc/ifunc-13a-i386.s: Likewise. * ld-ifunc/ifunc-13a-x86-64.s: Likewise. * ld-ifunc/ifunc-13b-i386.s: Likewise. * ld-ifunc/ifunc-13b-x86-64.s: Likewise. Index: binutils-2.21/bfd/elf-ifunc.c =================================================================== --- binutils-2.21.orig/bfd/elf-ifunc.c 2010-07-13 09:59:10.000000000 -0700 +++ binutils-2.21/bfd/elf-ifunc.c 2011-06-21 16:33:40.751884107 -0700 @@ -190,10 +190,29 @@ /* Support garbage collection against STT_GNU_IFUNC symbols. */ if (h->plt.refcount <= 0 && h->got.refcount <= 0) { - h->got = htab->init_got_offset; - h->plt = htab->init_plt_offset; - *head = NULL; - return TRUE; + /* When building shared library, we need to handle the case + where it is marked with regular reference, but not non-GOT + reference. It may happen if we didn't see STT_GNU_IFUNC + symbol at the time when checking relocations. */ + bfd_size_type count = 0; + + if (info->shared + && !h->non_got_ref + && h->ref_regular) + { + for (p = *head; p != NULL; p = p->next) + count += p->count; + if (count != 0) + h->non_got_ref = 1; + } + + if (count == 0) + { + h->got = htab->init_got_offset; + h->plt = htab->init_plt_offset; + *head = NULL; + return TRUE; + } } /* Return and discard space for dynamic relocations against it if Index: binutils-2.21/bfd/elf32-i386.c =================================================================== --- binutils-2.21.orig/bfd/elf32-i386.c 2010-10-21 05:29:02.000000000 -0700 +++ binutils-2.21/bfd/elf32-i386.c 2011-06-21 16:33:40.761884138 -0700 @@ -1807,23 +1807,10 @@ r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) { - struct elf_i386_link_hash_entry *eh; - struct elf_dyn_relocs **pp; - struct elf_dyn_relocs *p; - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; - eh = (struct elf_i386_link_hash_entry *) h; - - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) - if (p->sec == sec) - { - /* Everything must go for SEC. */ - *pp = p->next; - break; - } } else { @@ -1843,6 +1830,22 @@ } } + if (h) + { + struct elf_i386_link_hash_entry *eh; + struct elf_dyn_relocs **pp; + struct elf_dyn_relocs *p; + + eh = (struct elf_i386_link_hash_entry *) h; + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + /* Everything must go for SEC. */ + *pp = p->next; + break; + } + } + r_type = ELF32_R_TYPE (rel->r_info); if (! elf_i386_tls_transition (info, abfd, sec, NULL, symtab_hdr, sym_hashes, @@ -1883,7 +1886,8 @@ case R_386_32: case R_386_PC32: - if (info->shared) + if (info->shared + && (h == NULL || h->type != STT_GNU_IFUNC)) break; /* Fall through */ Index: binutils-2.21/bfd/elf64-x86-64.c =================================================================== --- binutils-2.21.orig/bfd/elf64-x86-64.c 2010-10-21 05:29:02.000000000 -0700 +++ binutils-2.21/bfd/elf64-x86-64.c 2011-06-21 16:33:40.761884138 -0700 @@ -1645,23 +1645,10 @@ r_symndx = ELF64_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) { - struct elf64_x86_64_link_hash_entry *eh; - struct elf_dyn_relocs **pp; - struct elf_dyn_relocs *p; - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; - eh = (struct elf64_x86_64_link_hash_entry *) h; - - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) - if (p->sec == sec) - { - /* Everything must go for SEC. */ - *pp = p->next; - break; - } } else { @@ -1682,7 +1669,24 @@ } } - r_type = ELF64_R_TYPE (rel->r_info); + if (h) + { + struct elf64_x86_64_link_hash_entry *eh; + struct elf_dyn_relocs **pp; + struct elf_dyn_relocs *p; + + eh = (struct elf64_x86_64_link_hash_entry *) h; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + /* Everything must go for SEC. */ + *pp = p->next; + break; + } + } + + r_type = ELF32_R_TYPE (rel->r_info); if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL, symtab_hdr, sym_hashes, &r_type, GOT_UNKNOWN, @@ -1733,7 +1737,8 @@ case R_X86_64_PC16: case R_X86_64_PC32: case R_X86_64_PC64: - if (info->shared) + if (info->shared + && (h == NULL || h->type != STT_GNU_IFUNC)) break; /* Fall thru */ Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-10-i386.s =================================================================== --- binutils-2.21.orig/ld/testsuite/ld-ifunc/ifunc-10-i386.s 2010-07-13 09:59:14.000000000 -0700 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-10-i386.s 2011-06-21 16:36:36.832142380 -0700 @@ -6,6 +6,8 @@ movl ifunc@GOTOFF(%ecx), %eax call ifunc@PLT call ifunc + movl xxx@GOT(%ecx), %eax + movl xxx, %eax ret .section .text.bar,"ax",@progbits @@ -18,3 +20,7 @@ .type ifunc, @gnu_indirect_function ifunc: ret + + .section .data.foo,"aw",@progbits +xxx: + .long ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s =================================================================== --- binutils-2.21.orig/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s 2010-07-13 09:59:14.000000000 -0700 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s 2011-06-21 16:36:36.822142371 -0700 @@ -6,6 +6,7 @@ movl ifunc(%rip), %eax call ifunc@PLT call ifunc + movl xxx(%rip), %eax ret .section .text.bar,"ax",@progbits @@ -18,3 +19,7 @@ .type ifunc, @gnu_indirect_function ifunc: ret + + .section .data.foo,"aw",@progbits +xxx: + .quad ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-11-i386.s =================================================================== --- binutils-2.21.orig/ld/testsuite/ld-ifunc/ifunc-11-i386.s 2010-07-13 09:59:14.000000000 -0700 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-11-i386.s 2011-06-21 16:36:36.832142380 -0700 @@ -3,9 +3,11 @@ foo: .global foo movl ifunc@GOT(%ecx), %eax - movl ifunc@GOTOFF(%ecx), %eax + movl ifunc@GOTOFF(%ecx), %eax call ifunc@PLT call ifunc + movl xxx@GOT(%ecx), %eax + movl xxx, %eax ret .section .text.bar,"ax",@progbits @@ -16,6 +18,10 @@ .section .text.ifunc,"ax",@progbits .type ifunc, @gnu_indirect_function - .global ifunc + .global ifunc ifunc: ret + + .section .data.foo,"aw",@progbits +xxx: + .long ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s =================================================================== --- binutils-2.21.orig/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s 2010-07-13 09:59:14.000000000 -0700 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s 2011-06-21 16:36:36.822142371 -0700 @@ -6,6 +6,7 @@ movl ifunc(%rip), %eax call ifunc@PLT call ifunc + movl xxx(%rip), %eax ret .section .text.bar,"ax",@progbits @@ -19,3 +20,7 @@ .global ifunc ifunc: ret + + .section .data.foo,"aw",@progbits +xxx: + .quad ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-12-i386.d =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-12-i386.d 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,6 @@ +#ld: -shared -m elf_i386 -e bar --gc-sections +#as: --32 +#readelf: -r --wide +#target: x86_64-*-* i?86-*-* + +There are no relocations in this file. Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-12-x86-64.d =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-12-x86-64.d 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,6 @@ +#ld: -shared -m elf_x86_64 -e bar --gc-sections +#as: --64 +#readelf: -r --wide +#target: x86_64-*-* + +There are no relocations in this file. Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13-i386.d =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13-i386.d 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,19 @@ +#source: ifunc-13a-i386.s +#source: ifunc-13b-i386.s +#ld: -shared -m elf_i386 -z nocombreloc +#as: --32 +#readelf: -r --wide +#target: x86_64-*-* i?86-*-* + +Relocation section '.rel.got' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +#... +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_386_GLOB_DAT[ ]+ifunc\(\)[ ]+ifunc +#... +Relocation section '.rel.ifunc' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_386_32[ ]+ifunc\(\)[ ]+ifunc +#... +Relocation section '.rel.plt' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_386_JUMP_SLOT[ ]+ifunc\(\)[ ]+ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13-x86-64.d =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13-x86-64.d 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,18 @@ +#source: ifunc-13a-x86-64.s +#source: ifunc-13b-x86-64.s +#ld: -shared -m elf_x86_64 -z nocombreloc +#as: --64 +#readelf: -r --wide +#target: x86_64-*-* + +Relocation section '.rela.got' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_X86_64_GLOB_DAT[ ]+ifunc\(\)[ ]+ifunc \+ 0 +#... +Relocation section '.rela.ifunc' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_X86_64_64[ ]+ifunc\(\)[ ]+ifunc \+ 0 +#... +Relocation section '.rela.plt' at .* +[ ]+Offset[ ]+Info[ ]+Type[ ]+.* +[0-9a-f]+[ ]+[0-9a-f]+[ ]+R_X86_64_JUMP_SLOT[ ]+ifunc\(\)[ ]+ifunc \+ 0 Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13a-i386.s =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13a-i386.s 2011-06-21 16:36:36.822142371 -0700 @@ -0,0 +1,10 @@ + .text + .type foo, @function + .global +foo: + movl xxx@GOT(%ebx), %eax + ret + + .data +xxx: + .long ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13a-x86-64.s =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13a-x86-64.s 2011-06-21 16:36:36.822142371 -0700 @@ -0,0 +1,10 @@ + .text + .type foo, @function + .global +foo: + movl xxx(%rip), %eax + ret + + .data +xxx: + .quad ifunc Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13b-i386.s =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13b-i386.s 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,5 @@ + .text + .type ifunc, @gnu_indirect_function + .globl ifunc +ifunc: + ret Index: binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13b-x86-64.s =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ binutils-2.21/ld/testsuite/ld-ifunc/ifunc-13b-x86-64.s 2011-06-21 16:33:40.761884138 -0700 @@ -0,0 +1,5 @@ + .text + .type ifunc, @gnu_indirect_function + .globl ifunc +ifunc: + ret