/* 32-bit ELF support for ARM
- Copyright 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
typedef unsigned long int insn32;
typedef unsigned short int insn16;
PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *,
bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma));
-#define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_INTERWORK)
+#define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)
/* The linker script knows the section names for placement.
The entry_names are used to do simple name mangling on the stubs.
this. It is set up so that any shared library function that is
called before the relocation has been set up calls the dynamic
linker first. */
-static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] =
+static const unsigned long elf32_arm_plt0_entry [PLT_ENTRY_SIZE / 4] =
{
- 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */
- 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */
- 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */
- 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #8]! */
+ 0xe52de004, /* str lr, [sp, #-4]! */
+ 0xe59fe010, /* ldr lr, [pc, #16] */
+ 0xe08fe00e, /* add lr, pc, lr */
+ 0xe5bef008 /* ldr pc, [lr, #8]! */
};
/* Subsequent entries in a procedure linkage table look like
this. */
-static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] =
+static const unsigned long elf32_arm_plt_entry [PLT_ENTRY_SIZE / 4] =
{
- 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */
- 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */
- 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */
- 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */
+ 0xe59fc004, /* ldr ip, [pc, #4] */
+ 0xe08fc00c, /* add ip, pc, ip */
+ 0xe59cf000, /* ldr pc, [ip] */
+ 0x00000000 /* offset to symbol in got */
};
/* The ARM linker needs to keep track of the number of relocs that it
int no_pipeline_knowledge;
};
-
/* Create an entry in an ARM ELF linker hash table. */
static struct bfd_hash_entry *
}
}
- /* If the relocation is not against a symbol it cannot concern us. */
+ /* If the relocation is not against a symbol it cannot concern us. */
h = NULL;
/* We don't care about local symbols. */
bfd_signed_vma signed_addend;
struct elf32_arm_link_hash_table * globals;
+ /* If the start address has been set, then set the EF_ARM_HASENTRY
+ flag. Setting this more than once is redundant, but the cost is
+ not too high, and it keeps the code simple.
+
+ The test is done here, rather than somewhere else, because the
+ start address is only set just before the final link commences.
+
+ Note - if the user deliberately sets a start address of 0, the
+ flag will not be set. */
+ if (bfd_get_start_address (output_bfd) != 0)
+ elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY;
+
globals = elf32_arm_hash_table (info);
dynobj = elf_hash_table (info)->dynobj;
case R_ARM_REL32:
value -= (input_section->output_section->vma
- + input_section->output_offset);
+ + input_section->output_offset + rel->r_offset);
value += addend;
break;
}
upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff);
lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff);
+#ifndef OLD_ARM_ABI
+ if (r_type == R_ARM_THM_XPC22
+ && ((lower_insn & 0x1800) == 0x0800))
+ /* Remove bit zero of the adjusted offset. Bit zero can only be
+ set if the upper insn is at a half-word boundary, since the
+ destination address, an ARM instruction, must always be on a
+ word boundary. The semantics of the BLX (1) instruction, however,
+ are that bit zero in the offset must always be zero, and the
+ corresponding bit one in the target address will be set from bit
+ one of the source address. */
+ lower_insn &= ~1;
+#endif
/* Put the relocated value back in the object file: */
bfd_put_16 (input_bfd, upper_insn, hit_data);
bfd_put_16 (input_bfd, lower_insn, hit_data + 2);
(bfd_vma) 0);
case R_ARM_GOTPC:
- /* Use global offset table as symbol value. */
+ /* Use global offset table as symbol value. */
BFD_ASSERT (sgot != NULL);
if (sgot == NULL)
switch (r)
{
case bfd_reloc_overflow:
- if (!((*info->callbacks->reloc_overflow)
- (info, name, howto->name, (bfd_vma) 0,
- input_bfd, input_section, rel->r_offset)))
- return false;
+ /* If the overflowing reloc was to an undefined symbol,
+ we have already printed one error message and there
+ is no point complaining again. */
+ if ((! h ||
+ h->root.type != bfd_link_hash_undefined)
+ && (!((*info->callbacks->reloc_overflow)
+ (info, name, howto->name, (bfd_vma) 0,
+ input_bfd, input_section, rel->r_offset))))
+ return false;
break;
case bfd_reloc_undefined:
{
if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN)
{
- if (flags & EF_INTERWORK)
+ if (flags & EF_ARM_INTERWORK)
_bfd_error_handler (_("\
Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"),
bfd_get_filename (abfd));
&& EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN
&& in_flags != out_flags)
{
- /* Cannot mix PIC and non-PIC code. */
- if ((in_flags & EF_PIC) != (out_flags & EF_PIC))
- return false;
-
/* Cannot mix APCS26 and APCS32 code. */
- if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26))
+ if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
return false;
/* Cannot mix float APCS and non-float APCS code. */
- if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT))
+ if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
return false;
/* If the src and dest have different interworking flags
then turn off the interworking bit. */
- if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK))
+ if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
{
- if (out_flags & EF_INTERWORK)
+ if (out_flags & EF_ARM_INTERWORK)
_bfd_error_handler (_("\
Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"),
bfd_get_filename (obfd), bfd_get_filename (ibfd));
- in_flags &= ~EF_INTERWORK;
+ in_flags &= ~EF_ARM_INTERWORK;
}
+
+ /* Likewise for PIC, though don't warn for this case. */
+ if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC))
+ in_flags &= ~EF_ARM_PIC;
}
elf_elfheader (obfd)->e_flags = in_flags;
{
flagword out_flags;
flagword in_flags;
+ boolean flags_compatible = true;
+ boolean null_input_bfd = true;
+ asection *sec;
/* Check if we have the same endianess. */
if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
return true;
}
- /* Check flag compatibility. */
+ /* Identical flags must be compatible. */
if (in_flags == out_flags)
return true;
+ /* Check to see if the input BFD actually contains any sections.
+ If not, its flags may not have been initialised either, but it cannot
+ actually cause any incompatibility. */
+ for (sec = ibfd->sections; sec != NULL; sec = sec->next)
+ {
+ /* Ignore synthetic glue sections. */
+ if (strcmp (sec->name, ".glue_7")
+ && strcmp (sec->name, ".glue_7t"))
+ {
+ null_input_bfd = false;
+ break;
+ }
+ }
+ if (null_input_bfd)
+ return true;
+
/* Complain about various flag mismatches. */
if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags))
{
(in_flags & EF_ARM_EABIMASK) >> 24,
bfd_get_filename (obfd),
(out_flags & EF_ARM_EABIMASK) >> 24);
+ return false;
}
- else if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_UNKNOWN)
- /* Not sure what needs to be checked for EABI versions >= 1. */
- return true;
- if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26))
- _bfd_error_handler (_("\
+ /* Not sure what needs to be checked for EABI versions >= 1. */
+ if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN)
+ {
+ if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
+ {
+ _bfd_error_handler (_("\
Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
bfd_get_filename (ibfd),
- in_flags & EF_APCS_26 ? 26 : 32,
+ in_flags & EF_ARM_APCS_26 ? 26 : 32,
bfd_get_filename (obfd),
- out_flags & EF_APCS_26 ? 26 : 32);
+ out_flags & EF_ARM_APCS_26 ? 26 : 32);
+ flags_compatible = false;
+ }
- if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT))
- _bfd_error_handler (_("\
+ if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
+ {
+ _bfd_error_handler (_("\
Error: %s passes floats in %s registers, whereas %s passes them in %s registers"),
bfd_get_filename (ibfd),
- in_flags & EF_APCS_FLOAT ? _("float") : _("integer"),
+ in_flags & EF_ARM_APCS_FLOAT ? _("float") : _("integer"),
bfd_get_filename (obfd),
- out_flags & EF_APCS_26 ? _("float") : _("integer"));
+ out_flags & EF_ARM_APCS_26 ? _("float") : _("integer"));
+ flags_compatible = false;
+ }
- if ((in_flags & EF_PIC) != (out_flags & EF_PIC))
- _bfd_error_handler (_("\
-Error: %s is compiled as position %s code, whereas %s is not"),
- bfd_get_filename (ibfd),
- in_flags & EF_PIC ? _("independent") : _("dependent"),
- bfd_get_filename (obfd));
+#ifdef EF_ARM_SOFT_FLOAT
+ if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT))
+ {
+ _bfd_error_handler (_ ("\
+Error: %s uses %s floating point, whereas %s uses %s floating point"),
+ bfd_get_filename (ibfd),
+ in_flags & EF_ARM_SOFT_FLOAT ? _("soft") : _("hard"),
+ bfd_get_filename (obfd),
+ out_flags & EF_ARM_SOFT_FLOAT ? _("soft") : _("hard"));
+ flags_compatible = false;
+ }
+#endif
- /* Interworking mismatch is only a warning. */
- if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK))
- {
- _bfd_error_handler (_("\
+ /* Interworking mismatch is only a warning. */
+ if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
+ _bfd_error_handler (_("\
Warning: %s %s interworking, whereas %s %s"),
- bfd_get_filename (ibfd),
- in_flags & EF_INTERWORK ? _("supports") : _("does not support"),
- bfd_get_filename (obfd),
- out_flags & EF_INTERWORK ? _("does not") : _("does"));
- return true;
+ bfd_get_filename (ibfd),
+ in_flags & EF_ARM_INTERWORK ? _("supports") : _("does not support"),
+ bfd_get_filename (obfd),
+ out_flags & EF_ARM_INTERWORK ? _("does") : _("does not"));
}
- return false;
+ return flags_compatible;
}
/* Display the flags field. */
/* The following flag bits are GNU extenstions and not part of the
official ARM ELF extended ABI. Hence they are only decoded if
the EABI version is not set. */
- if (flags & EF_INTERWORK)
+ if (flags & EF_ARM_INTERWORK)
fprintf (file, _(" [interworking enabled]"));
- if (flags & EF_APCS_26)
+ if (flags & EF_ARM_APCS_26)
fprintf (file, _(" [APCS-26]"));
else
fprintf (file, _(" [APCS-32]"));
- if (flags & EF_APCS_FLOAT)
+ if (flags & EF_ARM_APCS_FLOAT)
fprintf (file, _(" [floats passed in float registers]"));
- if (flags & EF_PIC)
+ if (flags & EF_ARM_PIC)
fprintf (file, _(" [position independent]"));
- if (flags & EF_NEW_ABI)
+ if (flags & EF_ARM_NEW_ABI)
fprintf (file, _(" [new ABI]"));
- if (flags & EF_OLD_ABI)
+ if (flags & EF_ARM_OLD_ABI)
fprintf (file, _(" [old ABI]"));
- if (flags & EF_SOFT_FLOAT)
+ if (flags & EF_ARM_SOFT_FLOAT)
fprintf (file, _(" [software FP]"));
- flags &= ~(EF_INTERWORK | EF_APCS_26 | EF_APCS_FLOAT | EF_PIC
- | EF_NEW_ABI | EF_OLD_ABI | EF_SOFT_FLOAT);
+ flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT | EF_ARM_PIC
+ | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI | EF_ARM_SOFT_FLOAT);
break;
case EF_ARM_EABI_VER1:
flags &= ~ EF_ARM_SYMSARESORTED;
break;
+ case EF_ARM_EABI_VER2:
+ fprintf (file, _(" [Version2 EABI]"));
+
+ if (flags & EF_ARM_SYMSARESORTED)
+ fprintf (file, _(" [sorted symbol table]"));
+ else
+ fprintf (file, _(" [unsorted symbol table]"));
+
+ if (flags & EF_ARM_DYNSYMSUSESEGIDX)
+ fprintf (file, _(" [dynamic symbols use segment index]"));
+
+ if (flags & EF_ARM_MAPSYMSFIRST)
+ fprintf (file, _(" [mapping symbols precede others]"));
+
+ flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX
+ | EF_ARM_MAPSYMSFIRST);
+ break;
+
default:
fprintf (file, _(" <EABI version unrecognised>"));
break;
return true;
}
-
/* Find the nearest line to a particular section and offset, for error
reporting. This code is a duplicate of the code in elf.c, except
that it also accepts STT_ARM_TFUNC as a symbol that names a function. */
if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
filename_ptr, functionname_ptr,
- line_ptr, 0))
+ line_ptr, 0,
+ &elf_tdata (abfd)->dwarf2_find_line_info))
return true;
if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
got_offset = (plt_index + 3) * 4;
/* Fill in the entry in the procedure linkage table. */
- memcpy (splt->contents + h->plt.offset,
- elf32_arm_plt_entry,
- PLT_ENTRY_SIZE);
+ bfd_put_32 (output_bfd, elf32_arm_plt_entry[0],
+ splt->contents + h->plt.offset + 0);
+ bfd_put_32 (output_bfd, elf32_arm_plt_entry[1],
+ splt->contents + h->plt.offset + 4);
+ bfd_put_32 (output_bfd, elf32_arm_plt_entry[2],
+ splt->contents + h->plt.offset + 8);
bfd_put_32 (output_bfd,
(sgot->output_section->vma
+ sgot->output_offset
/* Mark the symbol as undefined, rather than as defined in
the .plt section. Leave the value alone. */
sym->st_shndx = SHN_UNDEF;
+ /* If the symbol is weak, we do need to clear the value.
+ Otherwise, the PLT entry would provide a definition for
+ the symbol even if the symbol wasn't defined anywhere,
+ and so the symbol would never be NULL. */
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
+ == 0)
+ sym->st_value = 0;
}
}
/* Fill in the first entry in the procedure linkage table. */
if (splt->_raw_size > 0)
- memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE);
+ {
+ bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0);
+ bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4);
+ bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8);
+ bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12);
+ }
/* UnixWare sets the entsize of .plt to 4, although that doesn't
really seem like the right value. */
i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION;
}
-
#define ELF_ARCH bfd_arch_arm
#define ELF_MACHINE_CODE EM_ARM
#define ELF_MAXPAGESIZE 0x8000
-
#define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
#define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
#define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
projects / deliverable / binutils-gdb.git / blobdiff