* elf32-ppc.c (LWZU_0_X_11): Delete.
(B, LWZ_11_X_11, LWZ_11_X_30, MTCTR_11): Define. (ppc_elf_select_plt_layout): Set .got flags too. Formatting. (ppc_elf_size_dynamic_sections): Allocate space for .glink branch table. (ppc_elf_finish_dynamic_symbol): Point .plt entries into the branch table. (ppc_elf_finish_dynamic_sections): Adjust DT_PPC_GLINK value. Generate .glink branch table and updated stubs.
This commit is contained in:
Alan Modra
parent
1ec742ac5e
commit
86b9da8823
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@ -1,3 +1,15 @@
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2005-05-12 Alan Modra <amodra@bigpond.net.au>
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* elf32-ppc.c (LWZU_0_X_11): Delete.
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(B, LWZ_11_X_11, LWZ_11_X_30, MTCTR_11): Define.
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(ppc_elf_select_plt_layout): Set .got flags too. Formatting.
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(ppc_elf_size_dynamic_sections): Allocate space for .glink branch
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table.
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(ppc_elf_finish_dynamic_symbol): Point .plt entries into the branch
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table.
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(ppc_elf_finish_dynamic_sections): Adjust DT_PPC_GLINK value.
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Generate .glink branch table and updated stubs.
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2005-05-11 Alan Modra <amodra@bigpond.net.au>
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* reloc.c (BFD_RELOC_HI16_PCREL): Define.
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118
bfd/elf32-ppc.c
118
bfd/elf32-ppc.c
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@ -67,6 +67,7 @@ static bfd_reloc_status_type ppc_elf_unhandled_reloc
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/* Some instructions. */
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#define NOP 0x60000000
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#define B 0x48000000
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#define ADDIS_11_11 0x3d6b0000
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#define ADDI_11_11 0x396b0000
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#define SUB_11_11_30 0x7d7e5850
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@ -77,7 +78,9 @@ static bfd_reloc_status_type ppc_elf_unhandled_reloc
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#define LWZ_12_8_30 0x819e0008
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#define BCTR 0x4e800420
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#define ADDIS_11_30 0x3d7e0000
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#define LWZU_0_X_11 0x840b0000
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#define LWZ_11_X_11 0x816b0000
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#define LWZ_11_X_30 0x817e0000
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#define MTCTR_11 0x7d6903a6
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/* Offset of tp and dtp pointers from start of TLS block. */
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#define TP_OFFSET 0x7000
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@ -3280,24 +3283,25 @@ ppc_elf_select_plt_layout (bfd *output_bfd ATTRIBUTE_UNUSED,
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if (!htab->old_plt)
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{
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/* The new PLT is a loaded section. Fix its flags. */
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if (htab->plt != NULL)
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{
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flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
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| SEC_IN_MEMORY | SEC_LINKER_CREATED);
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flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
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| SEC_IN_MEMORY | SEC_LINKER_CREATED);
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if (!bfd_set_section_flags (htab->elf.dynobj, htab->plt, flags))
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return -1;
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}
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/* The new PLT is a loaded section. */
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if (htab->plt != NULL
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&& !bfd_set_section_flags (htab->elf.dynobj, htab->plt, flags))
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return -1;
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/* The new GOT is not executable. */
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if (htab->got != NULL
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&& !bfd_set_section_flags (htab->elf.dynobj, htab->got, flags))
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return -1;
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}
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else
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{
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/* Stop an unused .glink section from affecting .text alignment. */
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if (htab->glink != NULL)
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{
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if (!bfd_set_section_alignment (htab->elf.dynobj, htab->glink, 0))
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return -1;
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}
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if (htab->glink != NULL
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&& !bfd_set_section_alignment (htab->elf.dynobj, htab->glink, 0))
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return -1;
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}
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return !htab->old_plt;
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}
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@ -4302,6 +4306,10 @@ ppc_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
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if (htab->glink != NULL && htab->glink->size != 0)
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{
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htab->glink_pltresolve = htab->glink->size;
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/* Space for the branch table. */
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htab->glink->size += htab->glink->size / (GLINK_ENTRY_SIZE / 4) - 4;
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/* Pad out to align the start of PLTresolve. */
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htab->glink->size += -htab->glink->size & 15;
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htab->glink->size += GLINK_PLTRESOLVE;
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}
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@ -6197,6 +6205,7 @@ ppc_elf_finish_dynamic_symbol (bfd *output_bfd,
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else
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{
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bfd_vma val = (htab->glink_pltresolve
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+ h->plt.offset
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+ htab->glink->output_section->vma
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+ htab->glink->output_offset);
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bfd_put_32 (output_bfd, val, htab->plt->contents + h->plt.offset);
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@ -6345,7 +6354,7 @@ ppc_elf_finish_dynamic_sections (bfd *output_bfd,
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case DT_PPC_GLINK:
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s = htab->glink;
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dyn.d_un.d_ptr = (htab->glink_pltresolve
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dyn.d_un.d_ptr = (s->size - GLINK_PLTRESOLVE
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+ s->output_section->vma + s->output_offset);
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break;
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@ -6380,7 +6389,7 @@ ppc_elf_finish_dynamic_sections (bfd *output_bfd,
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{
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unsigned char *p;
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unsigned char *endp;
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bfd_vma pltgot;
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bfd_vma got, pltgot;
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unsigned int i;
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static const unsigned int plt_resolve[] =
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{
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@ -6400,17 +6409,67 @@ ppc_elf_finish_dynamic_sections (bfd *output_bfd,
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#define PPC_HI(v) (((v) >> 16) & 0xffff)
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#define PPC_HA(v) PPC_HI ((v) + 0x8000)
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got = (htab->elf.hgot->root.u.def.value
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+ htab->elf.hgot->root.u.def.section->output_section->vma
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+ htab->elf.hgot->root.u.def.section->output_offset);
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pltgot = (htab->plt->output_section->vma
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+ htab->plt->output_offset
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- htab->elf.hgot->root.u.def.value
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- htab->elf.hgot->root.u.def.section->output_section->vma
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- htab->elf.hgot->root.u.def.section->output_offset);
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- got);
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/* Write the plt call stubs. */
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p = htab->glink->contents;
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p += htab->glink_pltresolve;
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bfd_put_32 (output_bfd, ADDIS_11_11 + PPC_HA (-pltgot), p);
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endp = p + htab->glink_pltresolve;
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while (p < endp)
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{
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if (pltgot < 0x8000)
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{
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bfd_put_32 (output_bfd, LWZ_11_X_30 + pltgot, p);
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p += 4;
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bfd_put_32 (output_bfd, MTCTR_11, p);
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p += 4;
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bfd_put_32 (output_bfd, BCTR, p);
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p += 4;
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bfd_put_32 (output_bfd, NOP, p);
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p += 4;
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}
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else
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{
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bfd_put_32 (output_bfd, ADDIS_11_30 + PPC_HA (pltgot), p);
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p += 4;
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bfd_put_32 (output_bfd, LWZ_11_X_11 + PPC_LO (pltgot), p);
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p += 4;
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bfd_put_32 (output_bfd, MTCTR_11, p);
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p += 4;
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bfd_put_32 (output_bfd, BCTR, p);
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p += 4;
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}
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pltgot += 4;
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}
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/* Now build the branch table, one for each plt entry (less one),
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and perhaps some padding. */
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endp = htab->glink->contents;
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endp += htab->glink->size - GLINK_PLTRESOLVE;
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while (p < endp - 8 * 4)
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{
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bfd_put_32 (output_bfd, B + endp - p, p);
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p += 4;
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}
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while (p < endp)
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{
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bfd_put_32 (output_bfd, NOP, p);
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p += 4;
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}
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got -= (htab->glink_pltresolve
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+ htab->glink->output_section->vma
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+ htab->glink->output_offset);
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/* Last comes the PLTresolve stub. */
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bfd_put_32 (output_bfd, ADDIS_11_11 + PPC_HA (got), p);
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p += 4;
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bfd_put_32 (output_bfd, ADDI_11_11 + PPC_LO (-pltgot), p);
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bfd_put_32 (output_bfd, ADDI_11_11 + PPC_LO (got), p);
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p += 4;
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for (i = 0; i < ARRAY_SIZE (plt_resolve); i++)
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@ -6420,21 +6479,6 @@ ppc_elf_finish_dynamic_sections (bfd *output_bfd,
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}
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if (ARRAY_SIZE (plt_resolve) + 2 != GLINK_PLTRESOLVE / 4)
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abort ();
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p = htab->glink->contents;
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endp = p + htab->glink_pltresolve;
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while (p < endp)
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{
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bfd_put_32 (output_bfd, ADDIS_11_30 + PPC_HA (pltgot), p);
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p += 4;
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bfd_put_32 (output_bfd, LWZU_0_X_11 + PPC_LO (pltgot), p);
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p += 4;
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bfd_put_32 (output_bfd, MTCTR_0, p);
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p += 4;
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bfd_put_32 (output_bfd, BCTR, p);
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p += 4;
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pltgot += 4;
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}
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}
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return TRUE;
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