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Make @GOT relocations work

This commit is contained in:
Michael Meissner 1996-01-04 00:44:32 +00:00
parent ef4d61874b
commit 07a159dbd4
2 changed files with 160 additions and 237 deletions
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12
bfd/ChangeLog
View File

@ -1,3 +1,15 @@
Wed Jan 3 19:42:47 1996 Michael Meissner <meissner@wogglebug.tiac.net>
* elf32-ppc.c (ppc_elf_relocate_section): Make @GOT relocations
work.
(ppc_elf_howto_raw): Just use bfd_elf_generic_reloc for all howto
relocs, since ppc_elf_relocate_section handles the linker case.
(ppc_elf_{addr16_ha,got16,toc16,brtaken}_reloc): Delete, no longer
used.
(ppc_elf_{addr16_ha,got16,toc16,brtaken}_inner): Merge these into
ppc_elf_relocate_section since that is now the only caller.
(ppc_elf_relocate_section): Ditto.
Wed Jan 3 15:11:30 1996 Ian Lance Taylor <ian@cygnus.com>
* coffcode.h (coff_write_object_contents): If we don't know the

385
bfd/elf32-ppc.c
View File

@ -104,18 +104,6 @@ static bfd_reloc_status_type ppc_elf_unsupported_reloc
static bfd_reloc_status_type ppc_elf_std_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_vma ppc_elf_addr16_ha_inner PARAMS ((bfd_vma));
static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_vma ppc_elf_got16_inner PARAMS ((asection *sec));
static bfd_reloc_status_type ppc_elf_got16_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_vma ppc_elf_toc16_inner PARAMS ((asection *sec));
static bfd_reloc_status_type ppc_elf_toc16_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_vma ppc_elf_brtaken_inner PARAMS ((bfd_vma, enum ppc_reloc_type));
static bfd_reloc_status_type ppc_elf_brtaken_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type *ppc_elf_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void ppc_elf_info_to_howto
@ -265,7 +253,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
ppc_elf_addr16_ha_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR16_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -298,7 +286,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_brtaken_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR14_BRTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
@ -315,7 +303,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_brtaken_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR14_BRNTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
@ -362,7 +350,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_elf_brtaken_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL14_BRTAKEN", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -379,7 +367,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_elf_brtaken_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL14_BRNTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
@ -395,7 +383,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_elf_got16_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -411,7 +399,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_got16_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -427,7 +415,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_got16_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -684,7 +672,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_elf_got16_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SDAREL16", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -840,7 +828,7 @@ static reloc_howto_type ppc_elf_howto_raw[] =
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_elf_toc16_reloc, /* special_function */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_TOC16", /* name */
false, /* partial_inplace */
0, /* src_mask */
@ -982,10 +970,11 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
boolean error;
/* Check if we have the same endianess */
if (ibfd->xvec->byteorder != obfd->xvec->byteorder)
if (ibfd->xvec->byteorder != obfd->xvec->byteorder
&& obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
{
(*_bfd_error_handler)
("%s: compiled for a %s endian system and target is %s endian.\n",
("%s: compiled for a %s endian system and target is %s endian",
bfd_get_filename (ibfd),
bfd_big_endian (ibfd) ? "big" : "little",
bfd_big_endian (obfd) ? "big" : "little");
@ -1021,7 +1010,7 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
{
error = true;
(*_bfd_error_handler)
("%s: compiled with -mrelocatable and linked with modules compiled normally\n",
("%s: compiled with -mrelocatable and linked with modules compiled normally",
bfd_get_filename (ibfd));
}
else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
@ -1029,7 +1018,7 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
{
error = true;
(*_bfd_error_handler)
("%s: compiled normally and linked with modules compiled with -mrelocatable\n",
("%s: compiled normally and linked with modules compiled with -mrelocatable",
bfd_get_filename (ibfd));
}
else if ((new_flags & EF_PPC_RELOCATABLE_LIB) != 0)
@ -1044,7 +1033,7 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
new_flags &= ~EF_PPC_EMB;
error = true;
(*_bfd_error_handler)
("%s: compiled for the eabi and linked with modules compiled for System V\n",
("%s: compiled for the eabi and linked with modules compiled for System V",
bfd_get_filename (ibfd));
}
else if ((new_flags & EF_PPC_EMB) == 0 && (old_flags & EF_PPC_EMB) != 0)
@ -1052,7 +1041,7 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
old_flags &= ~EF_PPC_EMB;
error = true;
(*_bfd_error_handler)
("%s: compiled for System V and linked with modules compiled for eabi\n",
("%s: compiled for System V and linked with modules compiled for eabi",
bfd_get_filename (ibfd));
}
@ -1061,7 +1050,7 @@ ppc_elf_merge_private_bfd_data (ibfd, obfd)
{
error = true;
(*_bfd_error_handler)
("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)\n",
("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
}
@ -1130,7 +1119,7 @@ ppc_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
{
BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
(*_bfd_error_handler)
("%s: Relocation %s (%d) is not currently supported.\n",
("%s: relocation %s (%d) is not currently supported",
bfd_get_filename (abfd),
reloc_entry->howto->name,
reloc_entry->howto->type);
@ -1138,188 +1127,6 @@ ppc_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
return bfd_reloc_notsupported;
}
/* Internal function to return the adjustment to the addend for relocations
that return the upper 16 bits after sign extending the lower 16 bits, ie
for use with a ADDIS instruction followed by a memory reference using the
bottom 16 bits. */
INLINE
static bfd_vma
ppc_elf_addr16_ha_inner (relocation)
bfd_vma relocation;
{
return (relocation & 0x8000) << 1;
}
/* Handle the ADDR16_HA reloc by adjusting the reloc addend. */
/*ARGSUSED*/
static bfd_reloc_status_type
ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
bfd_vma relocation;
asection *sec;
if (output_bfd != (bfd *) NULL)
return ppc_elf_std_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
sec = symbol->section;
relocation = (((bfd_is_com_section (sec)) ? 0 : symbol->value)
+ sec->output_section->vma
+ sec->output_offset
+ reloc_entry->addend);
reloc_entry->addend += ppc_elf_addr16_ha_inner (relocation);
return bfd_reloc_continue;
}
/* Internal function to return the addjustment to the addend for GOT16
entries */
INLINE
static bfd_vma
ppc_elf_got16_inner (sec)
asection *sec;
{
#ifdef DEBUG
fprintf (stderr, "ppc_elf_got16_inner called for %s\n", sec->name);
#endif
return -(sec->output_section->vma + 0x8000);
}
/* Handle the GOT16 reloc. We want to use the offset within the .got
section, not the actual VMA. */
/*ARGSUSED*/
static bfd_reloc_status_type
ppc_elf_got16_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
if (output_bfd != (bfd *) NULL)
return ppc_elf_std_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
#ifdef DEBUG
fprintf (stderr, "ppc_elf_got16_reloc called for %s in %s\n", (*reloc_entry->sym_ptr_ptr)->name, input_section->name);
#endif
reloc_entry->addend += ppc_elf_got16_inner (bfd_get_section (*reloc_entry->sym_ptr_ptr));
return bfd_reloc_continue;
}
/* Internal function to return the addjustment to the addend for TOC16
entries */
INLINE
static bfd_vma
ppc_elf_toc16_inner (sec)
asection *sec;
{
BFD_ASSERT (bfd_is_und_section (sec)
|| strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".sdata") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".sbss") == 0)
return -(sec->output_section->vma + 0x8000);
}
/* Handle the TOC16 reloc. We want to use the offset within the .got
section, not the actual VMA. This is appropriate when generating
an embedded ELF object, for which the .got section acts like the
AIX .toc section. */
/*ARGSUSED*/
static bfd_reloc_status_type
ppc_elf_toc16_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
if (output_bfd != (bfd *) NULL)
return ppc_elf_std_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
reloc_entry->addend += ppc_elf_toc16_inner (bfd_get_section (*reloc_entry->sym_ptr_ptr));
return bfd_reloc_continue;
}
/* Internal function to return the adjustment for relocations that set the
branch taken bit or branch not taken in B0 for conditional branches.
The dst_mask for these relocations allows this bit to be set as part
of the addend. */
INLINE
static bfd_vma
ppc_elf_brtaken_inner (relocation, ppc_reloc)
bfd_vma relocation;
enum ppc_reloc_type ppc_reloc;
{
if (ppc_reloc == R_PPC_ADDR14_BRTAKEN || ppc_reloc == R_PPC_REL14_BRTAKEN)
return (relocation & 0x8000) ? 0 : BRANCH_PREDICT_BIT; /* branch taken */
else
return (relocation & 0x8000) ? BRANCH_PREDICT_BIT : 0; /* branch not taken */
}
/* Handle the R_PPC_{ADDR,REL}14_BR{,N}TAKEN relocs by setting bit 10 to indicate
whether the branch is taken or not. */
/*ARGSUSED*/
static bfd_reloc_status_type
ppc_elf_brtaken_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
bfd_vma relocation;
asection *sec;
long insn;
if (output_bfd != (bfd *) NULL)
return ppc_elf_std_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
sec = symbol->section;
relocation = (((bfd_is_com_section (sec)) ? 0 : symbol->value)
+ sec->output_section->vma
+ sec->output_offset
+ reloc_entry->addend);
/* Set the branch prediction bit */
insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
insn &= ~BRANCH_PREDICT_BIT;
insn |= ppc_elf_brtaken_inner (relocation - reloc_entry->address,
(enum ppc_reloc_type)reloc_entry->howto->type);
bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
return bfd_reloc_continue;
}
/* Adjust a symbol defined by a dynamic object and referenced by a
regular object. The current definition is in some section of the
@ -1690,7 +1497,7 @@ ppc_elf_check_relocs (abfd, info, sec, relocs)
if (info->shared)
{
/* If we are generating a shared object, we need to
output a R_SPARC_RELATIVE reloc so that the
output a R_PPC_RELATIVE reloc so that the
dynamic linker can adjust this GOT entry. */
srelgot->_raw_size += sizeof (Elf32_External_Rela);
}
@ -2131,12 +1938,10 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
bfd *dynobj = elf_hash_table (info)->dynobj;
bfd_vma *local_got_offsets = elf_local_got_offsets (input_bfd);
asection *sgot;
asection *splt;
asection *sreloc;
Elf_Internal_Rela *rel = relocs;
Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
boolean ret = true;
asection *sgot = (asection *)0;
Elf_Internal_Rela *rel = relocs;
Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
boolean ret = true;
long insn;
#ifdef DEBUG
@ -2152,13 +1957,13 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
for (; rel < relend; rel++)
{
enum ppc_reloc_type r_type = (enum ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
bfd_vma offset = rel->r_offset;
bfd_vma addend = rel->r_addend;
bfd_reloc_status_type r = bfd_reloc_other;
Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
asection *sec = (asection *)0;
struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
enum ppc_reloc_type r_type = (enum ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
bfd_vma offset = rel->r_offset;
bfd_vma addend = rel->r_addend;
bfd_reloc_status_type r = bfd_reloc_other;
Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
asection *sec = (asection *)0;
struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
reloc_howto_type *howto;
unsigned long r_symndx;
bfd_vma relocation;
@ -2167,7 +1972,7 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type])
{
(*_bfd_error_handler)
("%s: Unknown relocation type %d\n",
("%s: unknown relocation type %d",
bfd_get_filename (input_bfd),
(int)r_type);
@ -2212,7 +2017,7 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
if (howto->special_function == ppc_elf_unsupported_reloc)
{
(*_bfd_error_handler)
("%s: Relocation %s (%d) is not currently supported.\n",
("%s: relocation %s (%d) is not currently supported",
bfd_get_filename (input_bfd),
howto->name,
(int)r_type);
@ -2262,14 +2067,23 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
default:
break;
case (int)R_PPC_ADDR14_BRTAKEN: /* branch prediction relocations */
case (int)R_PPC_ADDR14_BRNTAKEN:
case (int)R_PPC_ADDR14_BRTAKEN: /* branch taken prediction relocations */
case (int)R_PPC_REL14_BRTAKEN:
case (int)R_PPC_REL14_BRNTAKEN:
BFD_ASSERT (sec != (asection *)0);
insn = bfd_get_32 (output_bfd, contents + offset);
insn &= ~BRANCH_PREDICT_BIT;
insn |= ppc_elf_brtaken_inner (relocation - offset, r_type);
if ((relocation - offset) & 0x8000)
insn &= ~BRANCH_PREDICT_BIT;
else
insn |= BRANCH_PREDICT_BIT;
bfd_put_32 (output_bfd, insn, contents + offset);
break;
case (int)R_PPC_ADDR14_BRNTAKEN: /* branch not taken predicition relocations */
case (int)R_PPC_REL14_BRNTAKEN:
insn = bfd_get_32 (output_bfd, contents + offset);
if ((relocation - offset) & 0x8000)
insn |= BRANCH_PREDICT_BIT;
else
insn &= ~BRANCH_PREDICT_BIT;
bfd_put_32 (output_bfd, insn, contents + offset);
break;
@ -2277,18 +2091,115 @@ ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
case (int)R_PPC_GOT16_LO:
case (int)R_PPC_GOT16_HI:
case (int)R_PPC_SDAREL16:
fprintf (stderr, "GOT relocations in section %s from section %s\n", input_section->name, sec->name);
BFD_ASSERT (sec != (asection *)0);
addend += ppc_elf_got16_inner (sec);
if (!sgot)
{
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
}
if (h != NULL)
{
bfd_vma off;
off = h->got_offset;
BFD_ASSERT (off != (bfd_vma) -1);
if (! elf_hash_table (info)->dynamic_sections_created
|| (info->shared
&& info->symbolic
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
{
/* This is actually a static link, or it is a
-Bsymbolic link and the symbol is defined
locally. We must initialize this entry in the
global offset table. Since the offset must
always be a multiple of 4, we use the least
significant bit to record whether we have
initialized it already.
When doing a dynamic link, we create a .rela.got
relocation entry to initialize the value. This
is done in the finish_dynamic_symbol routine. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_32 (output_bfd, relocation,
sgot->contents + off);
h->got_offset |= 1;
}
}
relocation = sgot->output_offset + off;
}
else
{
bfd_vma off;
BFD_ASSERT (local_got_offsets != NULL
&& local_got_offsets[r_symndx] != (bfd_vma) -1);
off = local_got_offsets[r_symndx];
/* The offset must always be a multiple of 4. We use
the least significant bit to record whether we have
already processed this entry. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_32 (output_bfd, relocation, sgot->contents + off);
if (info->shared)
{
asection *srelgot;
Elf_Internal_Rela outrel;
/* We need to generate a R_SPARC_RELATIVE reloc
for the dynamic linker. */
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
BFD_ASSERT (srelgot != NULL);
outrel.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
outrel.r_addend = 0;
bfd_elf32_swap_reloca_out (output_bfd, &outrel,
(((Elf32_External_Rela *)
srelgot->contents)
+ srelgot->reloc_count));
++srelgot->reloc_count;
}
local_got_offsets[r_symndx] |= 1;
}
relocation = sgot->output_offset + off;
}
break;
/* Handle the TOC16 reloc. We want to use the offset within the .got
section, not the actual VMA. This is appropriate when generating
an embedded ELF object, for which the .got section acts like the
AIX .toc section. */
case (int)R_PPC_TOC16: /* phony GOT16 relocations */
BFD_ASSERT (sec != (asection *)0);
addend += ppc_elf_toc16_inner (sec);
BFD_ASSERT (bfd_is_und_section (sec)
|| strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".sdata") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".sbss") == 0)
addend -= sec->output_section->vma + 0x8000;
break;
case (int)R_PPC_ADDR16_HA: /* arithmetic adjust relocations */
BFD_ASSERT (sec != (asection *)0);
addend += ppc_elf_addr16_ha_inner (relocation + addend);
addend += ((relocation + addend) & 0x8000) << 1;
break;
}