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bfd/
* elf64-ppc.c (struct ppc64_elf_obj_tdata): Rename ha_relocs_not_using_r2 to unexpected_toc_insn. (ok_lo_toc_insn): New function. (ppc64_elf_edit_toc): Check insn on lo toc reloc. Emit warning. (ppc64_elf_relocate_section): Don't check insn on lo toc reloc here. Handle addic on lo toc reloc. ld/testsuite/ * ld-powerpc/powerpc.exp: Expect ld warnings for tocopt test. * ld-powerpc/tocopt.out: New file.
This commit is contained in:
Alan Modra
parent
d3895d7d29
commit
560c8763d3
@ -1,3 +1,12 @@
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2011-11-08 Alan Modra <amodra@gmail.com>
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* elf64-ppc.c (struct ppc64_elf_obj_tdata): Rename
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ha_relocs_not_using_r2 to unexpected_toc_insn.
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(ok_lo_toc_insn): New function.
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(ppc64_elf_edit_toc): Check insn on lo toc reloc. Emit warning.
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(ppc64_elf_relocate_section): Don't check insn on lo toc reloc here.
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Handle addic on lo toc reloc.
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2011-11-06 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
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PR ld/13387
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119
bfd/elf64-ppc.c
119
bfd/elf64-ppc.c
@ -2614,8 +2614,9 @@ struct ppc64_elf_obj_tdata
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the reloc to be in the range -32768 to 32767. */
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unsigned int has_small_toc_reloc : 1;
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/* Set if toc/got ha relocs detected not using r2. */
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unsigned int ha_relocs_not_using_r2 : 1;
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/* Set if toc/got ha relocs detected not using r2, or lo reloc
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instruction not one we handle. */
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unsigned int unexpected_toc_insn : 1;
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};
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#define ppc64_elf_tdata(bfd) \
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@ -8016,6 +8017,32 @@ adjust_toc_syms (struct elf_link_hash_entry *h, void *inf)
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return TRUE;
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}
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/* Return TRUE iff INSN is one we expect on a _LO variety toc/got reloc. */
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static bfd_boolean
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ok_lo_toc_insn (unsigned int insn)
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{
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return ((insn & (0x3f << 26)) == 14u << 26 /* addi */
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|| (insn & (0x3f << 26)) == 32u << 26 /* lwz */
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|| (insn & (0x3f << 26)) == 34u << 26 /* lbz */
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|| (insn & (0x3f << 26)) == 36u << 26 /* stw */
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|| (insn & (0x3f << 26)) == 38u << 26 /* stb */
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|| (insn & (0x3f << 26)) == 40u << 26 /* lhz */
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|| (insn & (0x3f << 26)) == 42u << 26 /* lha */
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|| (insn & (0x3f << 26)) == 44u << 26 /* sth */
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|| (insn & (0x3f << 26)) == 46u << 26 /* lmw */
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|| (insn & (0x3f << 26)) == 47u << 26 /* stmw */
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|| (insn & (0x3f << 26)) == 48u << 26 /* lfs */
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|| (insn & (0x3f << 26)) == 50u << 26 /* lfd */
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|| (insn & (0x3f << 26)) == 52u << 26 /* stfs */
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|| (insn & (0x3f << 26)) == 54u << 26 /* stfd */
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|| ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
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&& (insn & 3) != 1)
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|| ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
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&& ((insn & 3) == 0 || (insn & 3) == 3))
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|| (insn & (0x3f << 26)) == 12u << 26 /* addic */);
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}
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/* Examine all relocs referencing .toc sections in order to remove
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unused .toc entries. */
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@ -8270,11 +8297,13 @@ ppc64_elf_edit_toc (struct bfd_link_info *info)
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struct elf_link_hash_entry *h;
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Elf_Internal_Sym *sym;
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bfd_vma val;
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enum {no_check, check_lo, check_ha} insn_check;
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r_type = ELF64_R_TYPE (rel->r_info);
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switch (r_type)
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{
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default:
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insn_check = no_check;
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break;
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case R_PPC64_GOT_TLSLD16_HA:
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@ -8283,22 +8312,47 @@ ppc64_elf_edit_toc (struct bfd_link_info *info)
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case R_PPC64_GOT_DTPREL16_HA:
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case R_PPC64_GOT16_HA:
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case R_PPC64_TOC16_HA:
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{
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bfd_vma off = rel->r_offset & ~3;
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unsigned char buf[4];
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unsigned int insn;
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if (!bfd_get_section_contents (ibfd, sec, buf, off, 4))
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{
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free (used);
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goto error_ret;
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}
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insn = bfd_get_32 (ibfd, buf);
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if ((insn & ((0x3f << 26) | 0x1f << 16))
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!= ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)
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ppc64_elf_tdata (ibfd)->ha_relocs_not_using_r2 = 1;
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}
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insn_check = check_ha;
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break;
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case R_PPC64_GOT_TLSLD16_LO:
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case R_PPC64_GOT_TLSGD16_LO:
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case R_PPC64_GOT_TPREL16_LO_DS:
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case R_PPC64_GOT_DTPREL16_LO_DS:
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case R_PPC64_GOT16_LO:
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case R_PPC64_GOT16_LO_DS:
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case R_PPC64_TOC16_LO:
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case R_PPC64_TOC16_LO_DS:
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insn_check = check_lo;
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break;
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}
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if (insn_check != no_check)
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{
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bfd_vma off = rel->r_offset & ~3;
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unsigned char buf[4];
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unsigned int insn;
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if (!bfd_get_section_contents (ibfd, sec, buf, off, 4))
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{
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free (used);
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goto error_ret;
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}
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insn = bfd_get_32 (ibfd, buf);
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if (insn_check == check_lo
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? !ok_lo_toc_insn (insn)
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: ((insn & ((0x3f << 26) | 0x1f << 16))
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!= ((15u << 26) | (2 << 16)) /* addis rt,2,imm */))
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{
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char str[12];
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ppc64_elf_tdata (ibfd)->unexpected_toc_insn = 1;
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sprintf (str, "%#08x", insn);
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info->callbacks->einfo
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(_("%P: %H: toc optimization is not supported for"
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" %s instruction.\n"),
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ibfd, sec, rel->r_offset & ~3, str);
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}
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}
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switch (r_type)
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@ -13322,7 +13376,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
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case R_PPC64_GOT16_HA:
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case R_PPC64_TOC16_HA:
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if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000
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&& !ppc64_elf_tdata (input_bfd)->ha_relocs_not_using_r2)
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&& !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn)
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{
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bfd_byte *p = contents + (rel->r_offset & ~3);
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bfd_put_32 (input_bfd, NOP, p);
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@ -13338,33 +13392,22 @@ ppc64_elf_relocate_section (bfd *output_bfd,
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case R_PPC64_TOC16_LO:
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case R_PPC64_TOC16_LO_DS:
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if (htab->do_toc_opt && relocation + addend + 0x8000 < 0x10000
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&& !ppc64_elf_tdata (input_bfd)->ha_relocs_not_using_r2)
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&& !ppc64_elf_tdata (input_bfd)->unexpected_toc_insn)
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{
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bfd_byte *p = contents + (rel->r_offset & ~3);
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insn = bfd_get_32 (input_bfd, p);
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if ((insn & (0x3f << 26)) == 14u << 26 /* addi */
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|| (insn & (0x3f << 26)) == 32u << 26 /* lwz */
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|| (insn & (0x3f << 26)) == 34u << 26 /* lbz */
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|| (insn & (0x3f << 26)) == 36u << 26 /* stw */
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|| (insn & (0x3f << 26)) == 38u << 26 /* stb */
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|| (insn & (0x3f << 26)) == 40u << 26 /* lhz */
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|| (insn & (0x3f << 26)) == 42u << 26 /* lha */
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|| (insn & (0x3f << 26)) == 44u << 26 /* sth */
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|| (insn & (0x3f << 26)) == 46u << 26 /* lmw */
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|| (insn & (0x3f << 26)) == 47u << 26 /* stmw */
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|| (insn & (0x3f << 26)) == 48u << 26 /* lfs */
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|| (insn & (0x3f << 26)) == 50u << 26 /* lfd */
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|| (insn & (0x3f << 26)) == 52u << 26 /* stfs */
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|| (insn & (0x3f << 26)) == 54u << 26 /* stfd */
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|| ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
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&& (insn & 3) != 1)
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|| ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
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&& ((insn & 3) == 0 || (insn & 3) == 3)))
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if ((insn & (0x3f << 26)) == 12u << 26 /* addic */)
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{
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/* Transform addic to addi when we change reg. */
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insn &= ~((0x3f << 26) | (0x1f << 16));
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insn |= (14u << 26) | (2 << 16);
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}
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else
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{
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insn &= ~(0x1f << 16);
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insn |= 2 << 16;
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bfd_put_32 (input_bfd, insn, p);
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}
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bfd_put_32 (input_bfd, insn, p);
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}
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break;
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}
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@ -1,3 +1,8 @@
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2011-11-08 Alan Modra <amodra@gmail.com>
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* ld-powerpc/powerpc.exp: Expect ld warnings for tocopt test.
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* ld-powerpc/tocopt.out: New file.
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2011-10-25 Joern Rennecke <joern.rennecke@embecosm.com>
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* ld-srec/srec.exp: xfail epiphany.
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@ -204,7 +204,7 @@ set ppc64elftests {
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{"sym@tocbase" "-shared -melf64ppc" "-a64" {symtocbase-1.s symtocbase-2.s}
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{{objdump -dj.data symtocbase.d}} "symtocbase.so"}
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{"TOC opt" "-melf64ppc" "-a64" {tocopt.s}
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{{objdump -s tocopt.d}} "tocopt"}
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{{ld tocopt.out} {objdump -s tocopt.d}} "tocopt"}
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{"TOC opt2" "-melf64ppc --defsym x=2" "-a64" {tocopt2.s}
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{{ld tocopt2.out} {objdump -s tocopt2.d}} "tocopt2"}
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{"TOC opt3" "-melf64ppc -no-keep-memory --defsym x=2" "-a64" {tocopt3.s}
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4
ld/testsuite/ld-powerpc/tocopt.out
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4
ld/testsuite/ld-powerpc/tocopt.out
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@ -0,0 +1,4 @@
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.*
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\(\.text\+0x14\): .* 0x3fa00000 .*
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.*
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\(\.text\+0x34\): .* 0x3fa00010 .*
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