#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
+#include "libiberty.h"
#include "elf-bfd.h"
#include "elf/sparc.h"
#include "opcode/sparc.h"
#include "elfxx-sparc.h"
+#include "elf-vxworks.h"
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
#define MINUS_ONE (~ (bfd_vma) 0)
return index - 4;
}
+/* The format of the first PLT entry in a VxWorks executable. */
+static const bfd_vma sparc_vxworks_exec_plt0_entry[] =
+ {
+ 0x05000000, /* sethi %hi(_GLOBAL_OFFSET_TABLE_+8), %g2 */
+ 0x8410a000, /* or %g2, %lo(_GLOBAL_OFFSET_TABLE_+8), %g2 */
+ 0xc4008000, /* ld [ %g2 ], %g2 */
+ 0x81c08000, /* jmp %g2 */
+ 0x01000000 /* nop */
+ };
+
+/* The format of subsequent PLT entries. */
+static const bfd_vma sparc_vxworks_exec_plt_entry[] =
+ {
+ 0x03000000, /* sethi %hi(_GLOBAL_OFFSET_TABLE_+f@got), %g1 */
+ 0x82106000, /* or %g1, %lo(_GLOBAL_OFFSET_TABLE_+f@got), %g1 */
+ 0xc2004000, /* ld [ %g1 ], %g1 */
+ 0x81c04000, /* jmp %g1 */
+ 0x01000000, /* nop */
+ 0x03000000, /* sethi %hi(f@pltindex), %g1 */
+ 0x10800000, /* b _PLT_resolve */
+ 0x82106000 /* or %g1, %lo(f@pltindex), %g1 */
+ };
+
+/* The format of the first PLT entry in a VxWorks shared object. */
+static const bfd_vma sparc_vxworks_shared_plt0_entry[] =
+ {
+ 0xc405e008, /* ld [ %l7 + 8 ], %g2 */
+ 0x81c08000, /* jmp %g2 */
+ 0x01000000 /* nop */
+ };
+
+/* The format of subsequent PLT entries. */
+static const bfd_vma sparc_vxworks_shared_plt_entry[] =
+ {
+ 0x03000000, /* sethi %hi(f@got), %g1 */
+ 0x82106000, /* or %g1, %lo(f@got), %g1 */
+ 0xc205c001, /* ld [ %l7 + %g1 ], %g1 */
+ 0x81c04000, /* jmp %g1 */
+ 0x01000000, /* nop */
+ 0x03000000, /* sethi %hi(f@pltindex), %g1 */
+ 0x10800000, /* b _PLT_resolve */
+ 0x82106000 /* or %g1, %lo(f@pltindex), %g1 */
+ };
+
#define SPARC_ELF_PUT_WORD(htab, bfd, val, ptr) \
htab->put_word(bfd, val, ptr)
ret->append_rela = sparc_elf_append_rela_64;
ret->r_info = sparc_elf_r_info_64;
ret->r_symndx = sparc_elf_r_symndx_64;
- ret->build_plt_entry = sparc64_plt_entry_build;
ret->dtpoff_reloc = R_SPARC_TLS_DTPOFF64;
ret->dtpmod_reloc = R_SPARC_TLS_DTPMOD64;
ret->tpoff_reloc = R_SPARC_TLS_TPOFF64;
ret->append_rela = sparc_elf_append_rela_32;
ret->r_info = sparc_elf_r_info_32;
ret->r_symndx = sparc_elf_r_symndx_32;
- ret->build_plt_entry = sparc32_plt_entry_build;
ret->dtpoff_reloc = R_SPARC_TLS_DTPOFF32;
ret->dtpmod_reloc = R_SPARC_TLS_DTPMOD32;
ret->tpoff_reloc = R_SPARC_TLS_TPOFF32;
|| ! bfd_set_section_alignment (dynobj, htab->srelgot,
htab->word_align_power))
return FALSE;
+
+ if (htab->is_vxworks)
+ {
+ htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
+ if (!htab->sgotplt)
+ return FALSE;
+ }
+
return TRUE;
}
if (!info->shared)
htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
+ if (htab->is_vxworks)
+ {
+ if (!elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
+ return FALSE;
+ if (info->shared)
+ {
+ htab->plt_header_size
+ = 4 * ARRAY_SIZE (sparc_vxworks_shared_plt0_entry);
+ htab->plt_entry_size
+ = 4 * ARRAY_SIZE (sparc_vxworks_shared_plt_entry);
+ }
+ else
+ {
+ htab->plt_header_size
+ = 4 * ARRAY_SIZE (sparc_vxworks_exec_plt0_entry);
+ htab->plt_entry_size
+ = 4 * ARRAY_SIZE (sparc_vxworks_exec_plt_entry);
+ }
+ }
+ else
+ {
+ if (ABI_64_P (dynobj))
+ {
+ htab->build_plt_entry = sparc64_plt_entry_build;
+ htab->plt_header_size = PLT64_HEADER_SIZE;
+ htab->plt_entry_size = PLT64_ENTRY_SIZE;
+ }
+ else
+ {
+ htab->build_plt_entry = sparc32_plt_entry_build;
+ htab->plt_header_size = PLT32_HEADER_SIZE;
+ htab->plt_entry_size = PLT32_ENTRY_SIZE;
+ }
+ }
+
if (!htab->splt || !htab->srelplt || !htab->sdynbss
|| (!info->shared && !htab->srelbss))
abort ();
{
asection *s = htab->splt;
- /* The first four entries in .plt is reserved. */
+ /* Allocate room for the header. */
if (s->size == 0)
- s->size = (SPARC_ELF_WORD_BYTES(htab) == 8 ?
- PLT64_HEADER_SIZE : PLT32_HEADER_SIZE);
+ {
+ s->size = htab->plt_header_size;
+
+ /* Allocate space for the .rela.plt.unloaded relocations. */
+ if (htab->is_vxworks && !info->shared)
+ htab->srelplt2->size = sizeof (Elf32_External_Rela) * 2;
+ }
/* The procedure linkage table size is bounded by the magnitude
of the offset we can describe in the entry. */
}
/* Make room for this entry. */
- s->size += (SPARC_ELF_WORD_BYTES(htab) == 8 ?
- PLT64_ENTRY_SIZE : PLT32_ENTRY_SIZE);
+ s->size += htab->plt_entry_size;
/* We also need to make an entry in the .rela.plt section. */
htab->srelplt->size += SPARC_ELF_RELA_BYTES (htab);
+
+ if (htab->is_vxworks)
+ {
+ /* Allocate space for the .got.plt entry. */
+ htab->sgotplt->size += 4;
+
+ /* ...and for the .rela.plt.unloaded relocations. */
+ if (!info->shared)
+ htab->srelplt2->size += sizeof (Elf32_External_Rela) * 3;
+ }
}
else
{
elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
if (! ABI_64_P (output_bfd)
+ && !htab->is_vxworks
&& elf_hash_table (info)->dynamic_sections_created)
{
/* Make space for the trailing nop in .plt. */
if (s == htab->splt
|| s == htab->sgot
- || s == htab->sdynbss)
+ || s == htab->sdynbss
+ || s == htab->sgotplt)
{
/* Strip this section if we don't need it; see the
comment below. */
return TRUE;
}
+/* Build a VxWorks PLT entry. PLT_INDEX is the index of the PLT entry
+ and PLT_OFFSET is the byte offset from the start of .plt. GOT_OFFSET
+ is the offset of the associated .got.plt entry from
+ _GLOBAL_OFFSET_TABLE_. */
+
+static void
+sparc_vxworks_build_plt_entry (bfd *output_bfd, struct bfd_link_info *info,
+ bfd_vma plt_offset, bfd_vma plt_index,
+ bfd_vma got_offset)
+{
+ bfd_vma got_base;
+ const bfd_vma *plt_entry;
+ struct _bfd_sparc_elf_link_hash_table *htab;
+ bfd_byte *loc;
+ Elf_Internal_Rela rela;
+
+ htab = _bfd_sparc_elf_hash_table (info);
+ if (info->shared)
+ {
+ plt_entry = sparc_vxworks_shared_plt_entry;
+ got_base = 0;
+ }
+ else
+ {
+ plt_entry = sparc_vxworks_exec_plt_entry;
+ got_base = (htab->elf.hgot->root.u.def.value
+ + htab->elf.hgot->root.u.def.section->output_offset
+ + htab->elf.hgot->root.u.def.section->output_section->vma);
+ }
+
+ /* Fill in the entry in the procedure linkage table. */
+ bfd_put_32 (output_bfd, plt_entry[0] + ((got_base + got_offset) >> 10),
+ htab->splt->contents + plt_offset);
+ bfd_put_32 (output_bfd, plt_entry[1] + ((got_base + got_offset) & 0x3ff),
+ htab->splt->contents + plt_offset + 4);
+ bfd_put_32 (output_bfd, plt_entry[2],
+ htab->splt->contents + plt_offset + 8);
+ bfd_put_32 (output_bfd, plt_entry[3],
+ htab->splt->contents + plt_offset + 12);
+ bfd_put_32 (output_bfd, plt_entry[4],
+ htab->splt->contents + plt_offset + 16);
+ bfd_put_32 (output_bfd, plt_entry[5] + (plt_index >> 10),
+ htab->splt->contents + plt_offset + 20);
+ /* PC-relative displacement for a branch to the start of
+ the PLT section. */
+ bfd_put_32 (output_bfd, plt_entry[6] + (((-plt_offset - 24) >> 2)
+ & 0x003fffff),
+ htab->splt->contents + plt_offset + 24);
+ bfd_put_32 (output_bfd, plt_entry[7] + (plt_index & 0x3ff),
+ htab->splt->contents + plt_offset + 28);
+
+ /* Fill in the .got.plt entry, pointing initially at the
+ second half of the PLT entry. */
+ BFD_ASSERT (htab->sgotplt != NULL);
+ bfd_put_32 (output_bfd,
+ htab->splt->output_section->vma
+ + htab->splt->output_offset
+ + plt_offset + 20,
+ htab->sgotplt->contents + got_offset);
+
+ /* Add relocations to .rela.plt.unloaded. */
+ if (!info->shared)
+ {
+ loc = (htab->srelplt2->contents
+ + (2 + 3 * plt_index) * sizeof (Elf32_External_Rela));
+
+ /* Relocate the initial sethi. */
+ rela.r_offset = (htab->splt->output_section->vma
+ + htab->splt->output_offset
+ + plt_offset);
+ rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_HI22);
+ rela.r_addend = got_offset;
+ bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* Likewise the following or. */
+ rela.r_offset += 4;
+ rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_LO10);
+ bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* Relocate the .got.plt entry. */
+ rela.r_offset = (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ + got_offset);
+ rela.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_SPARC_32);
+ rela.r_addend = plt_offset + 20;
+ bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
+ }
+}
+
/* Finish up dynamic symbol handling. We set the contents of various
dynamic sections here. */
asection *srela;
Elf_Internal_Rela rela;
bfd_byte *loc;
- bfd_vma r_offset;
+ bfd_vma r_offset, got_offset;
int rela_index;
/* This symbol has an entry in the PLT. Set it up. */
srela = htab->srelplt;
BFD_ASSERT (splt != NULL && srela != NULL);
- /* Fill in the entry in the procedure linkage table. */
- rela_index = SPARC_ELF_BUILD_PLT_ENTRY (htab, output_bfd, splt,
- h->plt.offset, splt->size,
- &r_offset);
-
/* Fill in the entry in the .rela.plt section. */
- rela.r_offset = r_offset
- + (splt->output_section->vma + splt->output_offset);
- if (! ABI_64_P (output_bfd)
- || h->plt.offset < (PLT64_LARGE_THRESHOLD * PLT64_ENTRY_SIZE))
+ if (htab->is_vxworks)
{
+ /* Work out the index of this PLT entry. */
+ rela_index = ((h->plt.offset - htab->plt_header_size)
+ / htab->plt_entry_size);
+
+ /* Calculate the offset of the associated .got.plt entry.
+ The first three entries are reserved. */
+ got_offset = (rela_index + 3) * 4;
+
+ sparc_vxworks_build_plt_entry (output_bfd, info, h->plt.offset,
+ rela_index, got_offset);
+
+
+ /* On VxWorks, the relocation points to the .got.plt entry,
+ not the .plt entry. */
+ rela.r_offset = (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ + got_offset);
rela.r_addend = 0;
}
else
{
- rela.r_addend = -(h->plt.offset + 4)
- -(splt->output_section->vma + splt->output_offset);
+ /* Fill in the entry in the procedure linkage table. */
+ rela_index = SPARC_ELF_BUILD_PLT_ENTRY (htab, output_bfd, splt,
+ h->plt.offset, splt->size,
+ &r_offset);
+
+ rela.r_offset = r_offset
+ + (splt->output_section->vma + splt->output_offset);
+ if (! ABI_64_P (output_bfd)
+ || h->plt.offset < (PLT64_LARGE_THRESHOLD * PLT64_ENTRY_SIZE))
+ {
+ rela.r_addend = 0;
+ }
+ else
+ {
+ rela.r_addend = (-(h->plt.offset + 4)
+ - splt->output_section->vma
+ - splt->output_offset);
+ }
}
rela.r_info = SPARC_ELF_R_INFO (htab, NULL, h->dynindx, R_SPARC_JMP_SLOT);
SPARC_ELF_APPEND_RELA (htab, output_bfd, s, &rela);
}
- /* Mark some specially defined symbols as absolute. */
+ /* Mark some specially defined symbols as absolute. On VxWorks,
+ _GLOBAL_OFFSET_TABLE_ is not absolute: it is relative to the
+ ".got" section. Likewise _PROCEDURE_LINKAGE_TABLE_ and ".plt". */
if (strcmp (h->root.root.string, "_DYNAMIC") == 0
- || h == htab->elf.hgot
- || h == htab->elf.hplt)
+ || (!htab->is_vxworks
+ && (h == htab->elf.hgot || h == htab->elf.hplt)))
sym->st_shndx = SHN_ABS;
return TRUE;
#endif
static bfd_boolean
-sparc32_finish_dyn (bfd *output_bfd,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
+sparc32_finish_dyn (bfd *output_bfd, struct bfd_link_info *info,
bfd *dynobj, asection *sdyn,
asection *splt ATTRIBUTE_UNUSED)
{
Elf32_External_Dyn *dyncon, *dynconend;
+ struct _bfd_sparc_elf_link_hash_table *htab;
+ htab = _bfd_sparc_elf_hash_table (info);
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
for (; dyncon < dynconend; dyncon++)
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
- switch (dyn.d_tag)
+ if (htab->is_vxworks && dyn.d_tag == DT_RELASZ)
{
- case DT_PLTGOT: name = ".plt"; size = FALSE; break;
- case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
- case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
- default: name = NULL; size = FALSE; break;
+ /* On VxWorks, DT_RELASZ should not include the relocations
+ in .rela.plt. */
+ if (htab->srelplt)
+ {
+ dyn.d_un.d_val -= htab->srelplt->size;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ }
}
-
- if (name != NULL)
+ else if (htab->is_vxworks && dyn.d_tag == DT_PLTGOT)
{
- asection *s;
+ /* On VxWorks, DT_PLTGOT should point to the start of the GOT,
+ not to the start of the PLT. */
+ if (htab->sgotplt)
+ {
+ dyn.d_un.d_val = (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset);
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ }
+ }
+ else
+ {
+ switch (dyn.d_tag)
+ {
+ case DT_PLTGOT: name = ".plt"; size = FALSE; break;
+ case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
+ case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
+ default: name = NULL; size = FALSE; break;
+ }
- s = bfd_get_section_by_name (output_bfd, name);
- if (s == NULL)
- dyn.d_un.d_val = 0;
- else
+ if (name != NULL)
{
- if (! size)
- dyn.d_un.d_ptr = s->vma;
+ asection *s;
+
+ s = bfd_get_section_by_name (output_bfd, name);
+ if (s == NULL)
+ dyn.d_un.d_val = 0;
else
- dyn.d_un.d_val = s->size;
+ {
+ if (! size)
+ dyn.d_un.d_ptr = s->vma;
+ else
+ dyn.d_un.d_val = s->size;
+ }
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
}
- bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
}
}
return TRUE;
}
+/* Install the first PLT entry in a VxWorks executable and make sure that
+ .rela.plt.unloaded relocations have the correct symbol indexes. */
+
+static void
+sparc_vxworks_finish_exec_plt (bfd *output_bfd, struct bfd_link_info *info)
+{
+ struct _bfd_sparc_elf_link_hash_table *htab;
+ Elf_Internal_Rela rela;
+ bfd_vma got_base;
+ bfd_byte *loc;
+
+ htab = _bfd_sparc_elf_hash_table (info);
+
+ /* Calculate the absolute value of _GLOBAL_OFFSET_TABLE_. */
+ got_base = (htab->elf.hgot->root.u.def.section->output_section->vma
+ + htab->elf.hgot->root.u.def.section->output_offset
+ + htab->elf.hgot->root.u.def.value);
+
+ /* Install the initial PLT entry. */
+ bfd_put_32 (output_bfd,
+ sparc_vxworks_exec_plt0_entry[0] + ((got_base + 8) >> 10),
+ htab->splt->contents);
+ bfd_put_32 (output_bfd,
+ sparc_vxworks_exec_plt0_entry[1] + ((got_base + 8) & 0x3ff),
+ htab->splt->contents + 4);
+ bfd_put_32 (output_bfd,
+ sparc_vxworks_exec_plt0_entry[2],
+ htab->splt->contents + 8);
+ bfd_put_32 (output_bfd,
+ sparc_vxworks_exec_plt0_entry[3],
+ htab->splt->contents + 12);
+ bfd_put_32 (output_bfd,
+ sparc_vxworks_exec_plt0_entry[4],
+ htab->splt->contents + 16);
+
+ loc = htab->srelplt2->contents;
+
+ /* Add an unloaded relocation for the initial entry's "sethi". */
+ rela.r_offset = (htab->splt->output_section->vma
+ + htab->splt->output_offset);
+ rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_HI22);
+ rela.r_addend = 8;
+ bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* Likewise the following "or". */
+ rela.r_offset += 4;
+ rela.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_LO10);
+ bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* Fix up the remaining .rela.plt.unloaded relocations. They may have
+ the wrong symbol index for _G_O_T_ or _P_L_T_ depending on the order
+ in which symbols were output. */
+ while (loc < htab->srelplt2->contents + htab->srelplt2->size)
+ {
+ Elf_Internal_Rela rel;
+
+ /* The entry's initial "sethi" (against _G_O_T_). */
+ bfd_elf32_swap_reloc_in (output_bfd, loc, &rel);
+ rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_HI22);
+ bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* The following "or" (also against _G_O_T_). */
+ bfd_elf32_swap_reloc_in (output_bfd, loc, &rel);
+ rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_SPARC_LO10);
+ bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
+ loc += sizeof (Elf32_External_Rela);
+
+ /* The .got.plt entry (against _P_L_T_). */
+ bfd_elf32_swap_reloc_in (output_bfd, loc, &rel);
+ rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_SPARC_32);
+ bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
+ loc += sizeof (Elf32_External_Rela);
+ }
+}
+
+/* Install the first PLT entry in a VxWorks shared object. */
+
+static void
+sparc_vxworks_finish_shared_plt (bfd *output_bfd, struct bfd_link_info *info)
+{
+ struct _bfd_sparc_elf_link_hash_table *htab;
+ unsigned int i;
+
+ htab = _bfd_sparc_elf_hash_table (info);
+ for (i = 0; i < ARRAY_SIZE (sparc_vxworks_shared_plt0_entry); i++)
+ bfd_put_32 (output_bfd, sparc_vxworks_shared_plt0_entry[i],
+ htab->splt->contents + i * 4);
+}
+
bfd_boolean
_bfd_sparc_elf_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
{
/* Initialize the contents of the .plt section. */
if (splt->size > 0)
{
- if (ABI_64_P (output_bfd))
- memset (splt->contents, 0, 4 * PLT64_ENTRY_SIZE);
+ if (htab->is_vxworks)
+ {
+ if (info->shared)
+ sparc_vxworks_finish_shared_plt (output_bfd, info);
+ else
+ sparc_vxworks_finish_exec_plt (output_bfd, info);
+ }
else
{
- memset (splt->contents, 0, 4 * PLT32_ENTRY_SIZE);
- bfd_put_32 (output_bfd, (bfd_vma) SPARC_NOP,
- splt->contents + splt->size - 4);
+ memset (splt->contents, 0, htab->plt_header_size);
+ if (!ABI_64_P (output_bfd))
+ bfd_put_32 (output_bfd, (bfd_vma) SPARC_NOP,
+ splt->contents + splt->size - 4);
}
}
- elf_section_data (splt->output_section)->this_hdr.sh_entsize =
- (ABI_64_P (output_bfd) ? PLT64_ENTRY_SIZE : PLT32_ENTRY_SIZE);
+ elf_section_data (splt->output_section)->this_hdr.sh_entsize
+ = htab->plt_entry_size;
}
/* Set the first entry in the global offset table to the address of
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