static boolean do_copy PARAMS((bfd *, bfd *));
static boolean do_shared_object_padding PARAMS ((bfd *, bfd *, ufile_ptr *, int));
+/* Relocation functions */
+static boolean xcoff_reloc_type_noop PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_fail PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_pos PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_neg PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_rel PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_toc PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_ba PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_br PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+static boolean xcoff_reloc_type_crel PARAMS ((XCOFF_RELOC_FUNCTION_ARGS));
+
+static boolean xcoff_complain_overflow_dont_func
+ PARAMS ((XCOFF_COMPLAIN_FUNCTION_ARGS));
+static boolean xcoff_complain_overflow_bitfield_func
+ PARAMS ((XCOFF_COMPLAIN_FUNCTION_ARGS));
+static boolean xcoff_complain_overflow_signed_func
+ PARAMS ((XCOFF_COMPLAIN_FUNCTION_ARGS));
+static boolean xcoff_complain_overflow_unsigned_func
+ PARAMS ((XCOFF_COMPLAIN_FUNCTION_ARGS));
+
+boolean (*xcoff_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION])
+ (XCOFF_RELOC_FUNCTION_ARGS) =
+{
+ xcoff_reloc_type_pos, /* R_POS (0x00) */
+ xcoff_reloc_type_neg, /* R_NEG (0x01) */
+ xcoff_reloc_type_rel, /* R_REL (0x02) */
+ xcoff_reloc_type_toc, /* R_TOC (0x03) */
+ xcoff_reloc_type_fail, /* R_RTB (0x04) */
+ xcoff_reloc_type_toc, /* R_GL (0x05) */
+ xcoff_reloc_type_toc, /* R_TCL (0x06) */
+ xcoff_reloc_type_fail, /* (0x07) */
+ xcoff_reloc_type_ba, /* R_BA (0x08) */
+ xcoff_reloc_type_fail, /* (0x09) */
+ xcoff_reloc_type_br, /* R_BR (0x0a) */
+ xcoff_reloc_type_fail, /* (0x0b) */
+ xcoff_reloc_type_pos, /* R_RL (0x0c) */
+ xcoff_reloc_type_pos, /* R_RLA (0x0d) */
+ xcoff_reloc_type_fail, /* (0x0e) */
+ xcoff_reloc_type_noop, /* R_REF (0x0f) */
+ xcoff_reloc_type_fail, /* (0x10) */
+ xcoff_reloc_type_fail, /* (0x11) */
+ xcoff_reloc_type_toc, /* R_TRL (0x12) */
+ xcoff_reloc_type_toc, /* R_TRLA (0x13) */
+ xcoff_reloc_type_fail, /* R_RRTBI (0x14) */
+ xcoff_reloc_type_fail, /* R_RRTBA (0x15) */
+ xcoff_reloc_type_ba, /* R_CAI (0x16) */
+ xcoff_reloc_type_crel, /* R_CREL (0x17) */
+ xcoff_reloc_type_ba, /* R_RBA (0x18) */
+ xcoff_reloc_type_ba, /* R_RBAC (0x19) */
+ xcoff_reloc_type_br, /* R_RBR (0x1a) */
+ xcoff_reloc_type_ba, /* R_RBRC (0x1b) */
+};
+
+boolean (*xcoff_complain_overflow[XCOFF_MAX_COMPLAIN_OVERFLOW])
+ (XCOFF_COMPLAIN_FUNCTION_ARGS) =
+{
+ xcoff_complain_overflow_dont_func,
+ xcoff_complain_overflow_bitfield_func,
+ xcoff_complain_overflow_signed_func,
+ xcoff_complain_overflow_unsigned_func,
+};
+
/* We use our own tdata type. Its first field is the COFF tdata type,
so the COFF routines are compatible. */
}
\f
+static boolean
+xcoff_reloc_type_noop (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+ bfd_vma val ATTRIBUTE_UNUSED;
+ bfd_vma addend ATTRIBUTE_UNUSED;
+ bfd_vma *relocation ATTRIBUTE_UNUSED;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ return true;
+}
+
+static boolean
+xcoff_reloc_type_fail (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+ bfd_vma val ATTRIBUTE_UNUSED;
+ bfd_vma addend ATTRIBUTE_UNUSED;
+ bfd_vma *relocation ATTRIBUTE_UNUSED;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ (*_bfd_error_handler)
+ (_("%s: unsupported relocation type 0x%02x"),
+ bfd_get_filename (input_bfd), (unsigned int) rel->r_type);
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+}
+
+static boolean
+xcoff_reloc_type_pos (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+ bfd_vma val;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ *relocation = val + addend;
+ return true;
+}
+
+static boolean
+xcoff_reloc_type_neg (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+ bfd_vma val;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ *relocation = addend - val;
+ return true;
+}
+
+static boolean
+xcoff_reloc_type_rel (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto;
+ bfd_vma val;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ howto->pc_relative = true;
+
+ /* A PC relative reloc includes the section address. */
+ addend += input_section->vma;
+
+ *relocation = val + addend;
+ *relocation -= (input_section->output_section->vma +
+ input_section->output_offset);
+ return true;
+}
+static boolean
+xcoff_reloc_type_toc (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd;
+ struct internal_reloc *rel;
+ struct internal_syment *sym;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+ bfd_vma val;
+ bfd_vma addend ATTRIBUTE_UNUSED;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ struct xcoff_link_hash_entry *h;
+
+ if (0 > rel->r_symndx)
+ return false;
+
+ h = obj_xcoff_sym_hashes (input_bfd)[rel->r_symndx];
+
+ if (h != NULL && h->smclas != XMC_TD)
+ {
+ if (h->toc_section == NULL)
+ {
+ (*_bfd_error_handler)
+ (_("%s: TOC reloc at 0x%x to symbol `%s' with no TOC entry"),
+ bfd_get_filename (input_bfd), rel->r_vaddr,
+ h->root.root.string);
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ }
+
+ BFD_ASSERT ((h->flags & XCOFF_SET_TOC) == 0);
+ val = (h->toc_section->output_section->vma
+ + h->toc_section->output_offset);
+ }
+
+ *relocation = ((val - xcoff_data (output_bfd)->toc) -
+ (sym->n_value - xcoff_data (input_bfd)->toc));
+ return true;
+}
+static boolean
+xcoff_reloc_type_ba (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto;
+ bfd_vma val;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ howto->src_mask &= ~3;
+ howto->dst_mask = howto->src_mask;
+
+ *relocation = val + addend;
+
+ return true;
+}
+
+static boolean
+xcoff_reloc_type_br (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd;
+ asection *input_section;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto;
+ bfd_vma val;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents;
+{
+ struct xcoff_link_hash_entry *h;
+
+ if (0 > rel->r_symndx)
+ return false;
+
+ h = obj_xcoff_sym_hashes (input_bfd)[rel->r_symndx];
+
+ /* If we see an R_BR or R_RBR reloc which is jumping to global
+ linkage code, and it is followed by an appropriate cror nop
+ instruction, we replace the cror with lwz r2,20(r1). This
+ restores the TOC after the glink code. Contrariwise, if the
+ call is followed by a lwz r2,20(r1), but the call is not
+ going to global linkage code, we can replace the load with a
+ cror. */
+ if (NULL != h
+ && bfd_link_hash_defined == h->root.type
+ && (rel->r_vaddr - input_section->vma + 8 <=
+ input_section->_cooked_size))
+ {
+ bfd_byte *pnext;
+ unsigned long next;
+
+ pnext = contents + (rel->r_vaddr - input_section->vma) + 4;
+ next = bfd_get_32 (input_bfd, pnext);
+
+ /* The _ptrgl function is magic. It is used by the AIX
+ compiler to call a function through a pointer. */
+ if (h->smclas == XMC_GL || strcmp (h->root.root.string, "._ptrgl") == 0)
+ {
+ if (next == 0x4def7b82 /* cror 15,15,15 */
+ || next == 0x4ffffb82 /* cror 31,31,31 */
+ || next == 0x60000000) /* ori r0,r0,0 */
+ bfd_put_32 (input_bfd, 0x80410014, pnext); /* lwz r1,20(r1) */
+
+ } else
+ {
+ if (next == 0x80410014) /* lwz r1,20(r1) */
+ bfd_put_32 (input_bfd, 0x60000000, pnext); /* ori r0,r0,0 */
+ }
+ }
+ else if (NULL != h && bfd_link_hash_undefined == h->root.type)
+ {
+ /* Normally, this relocation is against a defined symbol. In the
+ case where this is a partial link and the output section offset
+ is greater than 2^25, the linker will return an invalid error
+ message that the relocation has been truncated. Yes it has been
+ truncated but no it not important. For this case, disable the
+ overflow checking. */
+
+ howto->complain_on_overflow = complain_overflow_dont;
+ }
+
+ howto->pc_relative = true;
+ howto->src_mask &= ~3;
+ howto->dst_mask = howto->src_mask;
+
+ /* A PC relative reloc includes the section address. */
+ addend += input_section->vma;
+
+ *relocation = val + addend;
+ *relocation -= (input_section->output_section->vma +
+ input_section->output_offset);
+ return true;
+}
+
+static boolean
+xcoff_reloc_type_crel (input_bfd, input_section, output_bfd, rel, sym, howto,
+ val, addend, relocation, contents)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ asection *input_section;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct internal_reloc *rel ATTRIBUTE_UNUSED;
+ struct internal_syment *sym ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto;
+ bfd_vma val ATTRIBUTE_UNUSED;
+ bfd_vma addend;
+ bfd_vma *relocation;
+ bfd_byte *contents ATTRIBUTE_UNUSED;
+{
+ howto->pc_relative = true;
+ howto->src_mask &= ~3;
+ howto->dst_mask = howto->src_mask;
+
+ /* A PC relative reloc includes the section address. */
+ addend += input_section->vma;
+
+ *relocation = val + addend;
+ *relocation -= (input_section->output_section->vma +
+ input_section->output_offset);
+ return true;
+}
+
+static boolean
+xcoff_complain_overflow_dont_func (input_bfd, val, relocation, howto)
+ bfd *input_bfd ATTRIBUTE_UNUSED;
+ bfd_vma val ATTRIBUTE_UNUSED;
+ bfd_vma relocation ATTRIBUTE_UNUSED;
+ struct reloc_howto_struct *howto ATTRIBUTE_UNUSED;
+{
+ return false;
+}
+
+static boolean
+xcoff_complain_overflow_bitfield_func (input_bfd, val, relocation, howto)
+ bfd *input_bfd;
+ bfd_vma val;
+ bfd_vma relocation;
+ struct reloc_howto_struct *howto;
+{
+ bfd_vma addrmask, fieldmask, signmask, ss;
+ bfd_vma a, b, sum;
+
+ /* Get the values to be added together. For signed and unsigned
+ relocations, we assume that all values should be truncated to
+ the size of an address. For bitfields, all the bits matter.
+ See also bfd_check_overflow. */
+ fieldmask = N_ONES (howto->bitsize);
+ addrmask = N_ONES (bfd_arch_bits_per_address (input_bfd)) | fieldmask;
+ a = relocation;
+ b = val & howto->src_mask;
+
+ /* Much like unsigned, except no trimming with addrmask. In
+ addition, the sum overflows if there is a carry out of
+ the bfd_vma, i.e., the sum is less than either input
+ operand. */
+ a >>= howto->rightshift;
+ b >>= howto->bitpos;
+
+ /* Bitfields are sometimes used for signed numbers; for
+ example, a 13-bit field sometimes represents values in
+ 0..8191 and sometimes represents values in -4096..4095.
+ If the field is signed and a is -4095 (0x1001) and b is
+ -1 (0x1fff), the sum is -4096 (0x1000), but (0x1001 +
+ 0x1fff is 0x3000). It's not clear how to handle this
+ everywhere, since there is not way to know how many bits
+ are significant in the relocation, but the original code
+ assumed that it was fully sign extended, and we will keep
+ that assumption. */
+ signmask = (fieldmask >> 1) + 1;
+
+ if ((a & ~ fieldmask) != 0)
+ {
+ /* Some bits out of the field are set. This might not
+ be a problem: if this is a signed bitfield, it is OK
+ iff all the high bits are set, including the sign
+ bit. We'll try setting all but the most significant
+ bit in the original relocation value: if this is all
+ ones, we are OK, assuming a signed bitfield. */
+ ss = (signmask << howto->rightshift) - 1;
+ if ((ss | relocation) != ~ (bfd_vma) 0)
+ return true;
+ a &= fieldmask;
+ }
+
+ /* We just assume (b & ~ fieldmask) == 0. */
+
+ /* We explicitly permit wrap around if this relocation
+ covers the high bit of an address. The Linux kernel
+ relies on it, and it is the only way to write assembler
+ code which can run when loaded at a location 0x80000000
+ away from the location at which it is linked. */
+ if (howto->bitsize + howto->rightshift
+ == bfd_arch_bits_per_address (input_bfd))
+ return false;
+
+ sum = a + b;
+ if (sum < a || (sum & ~ fieldmask) != 0)
+ {
+ /* There was a carry out, or the field overflow. Test
+ for signed operands again. Here is the overflow test
+ is as for complain_overflow_signed. */
+ if (((~ (a ^ b)) & (a ^ sum)) & signmask)
+ return true;
+ }
+
+ return false;
+}
+
+static boolean
+xcoff_complain_overflow_signed_func (input_bfd, val, relocation, howto)
+ bfd *input_bfd;
+ bfd_vma val;
+ bfd_vma relocation;
+ struct reloc_howto_struct *howto;
+{
+ bfd_vma addrmask, fieldmask, signmask, ss;
+ bfd_vma a, b, sum;
+
+ /* Get the values to be added together. For signed and unsigned
+ relocations, we assume that all values should be truncated to
+ the size of an address. For bitfields, all the bits matter.
+ See also bfd_check_overflow. */
+ fieldmask = N_ONES (howto->bitsize);
+ addrmask = N_ONES (bfd_arch_bits_per_address (input_bfd)) | fieldmask;
+ a = relocation;
+ b = val & howto->src_mask;
+
+ a = (a & addrmask) >> howto->rightshift;
+
+ /* If any sign bits are set, all sign bits must be set.
+ That is, A must be a valid negative address after
+ shifting. */
+ signmask = ~ (fieldmask >> 1);
+ ss = a & signmask;
+ if (ss != 0 && ss != ((addrmask >> howto->rightshift) & signmask))
+ return true;
+
+ /* We only need this next bit of code if the sign bit of B
+ is below the sign bit of A. This would only happen if
+ SRC_MASK had fewer bits than BITSIZE. Note that if
+ SRC_MASK has more bits than BITSIZE, we can get into
+ trouble; we would need to verify that B is in range, as
+ we do for A above. */
+ signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
+ if ((b & signmask) != 0)
+ {
+ /* Set all the bits above the sign bit. */
+ b -= signmask <<= 1;
+ }
+
+ b = (b & addrmask) >> howto->bitpos;
+
+ /* Now we can do the addition. */
+ sum = a + b;
+
+ /* See if the result has the correct sign. Bits above the
+ sign bit are junk now; ignore them. If the sum is
+ positive, make sure we did not have all negative inputs;
+ if the sum is negative, make sure we did not have all
+ positive inputs. The test below looks only at the sign
+ bits, and it really just
+ SIGN (A) == SIGN (B) && SIGN (A) != SIGN (SUM)
+ */
+ signmask = (fieldmask >> 1) + 1;
+ if (((~ (a ^ b)) & (a ^ sum)) & signmask)
+ return true;
+
+ return false;
+}
+
+static boolean
+xcoff_complain_overflow_unsigned_func (input_bfd, val, relocation, howto)
+ bfd *input_bfd;
+ bfd_vma val;
+ bfd_vma relocation;
+ struct reloc_howto_struct *howto;
+{
+ bfd_vma addrmask, fieldmask;
+ bfd_vma a, b, sum;
+
+ /* Get the values to be added together. For signed and unsigned
+ relocations, we assume that all values should be truncated to
+ the size of an address. For bitfields, all the bits matter.
+ See also bfd_check_overflow. */
+ fieldmask = N_ONES (howto->bitsize);
+ addrmask = N_ONES (bfd_arch_bits_per_address (input_bfd)) | fieldmask;
+ a = relocation;
+ b = val & howto->src_mask;
+
+ /* Checking for an unsigned overflow is relatively easy:
+ trim the addresses and add, and trim the result as well.
+ Overflow is normally indicated when the result does not
+ fit in the field. However, we also need to consider the
+ case when, e.g., fieldmask is 0x7fffffff or smaller, an
+ input is 0x80000000, and bfd_vma is only 32 bits; then we
+ will get sum == 0, but there is an overflow, since the
+ inputs did not fit in the field. Instead of doing a
+ separate test, we can check for this by or-ing in the
+ operands when testing for the sum overflowing its final
+ field. */
+ a = (a & addrmask) >> howto->rightshift;
+ b = (b & addrmask) >> howto->bitpos;
+ sum = (a + b) & addrmask;
+ if ((a | b | sum) & ~ fieldmask)
+ return true;
+
+ return false;
+}
/* This is the relocation function for the RS/6000/POWER/PowerPC.
This is currently the only processor which uses XCOFF; I hope that
- will never change. */
+ will never change.
-static boolean
+ I took the relocation type definitions from two documents:
+ the PowerPC AIX Version 4 Application Binary Interface, First
+ Edition (April 1992), and the PowerOpen ABI, Big-Endian
+ 32-Bit Hardware Implementation (June 30, 1994). Differences
+ between the documents are noted below.
+
+ Unsupported r_type's
+
+ R_RTB:
+ R_RRTBI:
+ R_RRTBA:
+
+ These relocs are defined by the PowerPC ABI to be
+ relative branches which use half of the difference
+ between the symbol and the program counter. I can't
+ quite figure out when this is useful. These relocs are
+ not defined by the PowerOpen ABI.
+
+ Supported r_type's
+
+ R_POS:
+ Simple positive relocation.
+
+ R_NEG:
+ Simple negative relocation.
+
+ R_REL:
+ Simple PC relative relocation.
+
+ R_TOC:
+ TOC relative relocation. The value in the instruction in
+ the input file is the offset from the input file TOC to
+ the desired location. We want the offset from the final
+ TOC to the desired location. We have:
+ isym = iTOC + in
+ iinsn = in + o
+ osym = oTOC + on
+ oinsn = on + o
+ so we must change insn by on - in.
+
+ R_GL:
+ GL linkage relocation. The value of this relocation
+ is the address of the entry in the TOC section.
+
+ R_TCL:
+ Local object TOC address. I can't figure out the
+ difference between this and case R_GL.
+
+ R_TRL:
+ TOC relative relocation. A TOC relative load instruction
+ which may be changed to a load address instruction.
+ FIXME: We don't currently implement this optimization.
+
+ R_TRLA:
+ TOC relative relocation. This is a TOC relative load
+ address instruction which may be changed to a load
+ instruction. FIXME: I don't know if this is the correct
+ implementation.
+
+ R_BA:
+ Absolute branch. We don't want to mess with the lower
+ two bits of the instruction.
+
+ R_CAI:
+ The PowerPC ABI defines this as an absolute call which
+ may be modified to become a relative call. The PowerOpen
+ ABI does not define this relocation type.
+
+ R_RBA:
+ Absolute branch which may be modified to become a
+ relative branch.
+
+ R_RBAC:
+ The PowerPC ABI defines this as an absolute branch to a
+ fixed address which may be modified to an absolute branch
+ to a symbol. The PowerOpen ABI does not define this
+ relocation type.
+
+ R_RBRC:
+ The PowerPC ABI defines this as an absolute branch to a
+ fixed address which may be modified to a relative branch.
+ The PowerOpen ABI does not define this relocation type.
+
+ R_BR:
+ Relative branch. We don't want to mess with the lower
+ two bits of the instruction.
+
+ R_CREL:
+ The PowerPC ABI defines this as a relative call which may
+ be modified to become an absolute call. The PowerOpen
+ ABI does not define this relocation type.
+
+ R_RBR:
+ A relative branch which may be modified to become an
+ absolute branch. FIXME: We don't implement this,
+ although we should for symbols of storage mapping class
+ XMC_XO.
+
+ R_RL:
+ The PowerPC AIX ABI describes this as a load which may be
+ changed to a load address. The PowerOpen ABI says this
+ is the same as case R_POS.
+
+ R_RLA:
+ The PowerPC AIX ABI describes this as a load address
+ which may be changed to a load. The PowerOpen ABI says
+ this is the same as R_POS.
+*/
+
+boolean
xcoff_ppc_relocate_section (output_bfd, info, input_bfd,
input_section, contents, relocs, syms,
sections)
rel = relocs;
relend = rel + input_section->reloc_count;
-
for (; rel < relend; rel++)
{
long symndx;
bfd_vma addend;
bfd_vma val;
struct reloc_howto_struct howto;
- bfd_reloc_status_type rstat;
+ bfd_vma relocation;
+ bfd_vma value_to_relocate;
+ bfd_vma address;
+ bfd_byte *location;
/* Relocation type R_REF is a special relocation type which is
merely used to prevent garbage collection from occurring for
if (rel->r_type == R_REF)
continue;
- symndx = rel->r_symndx;
-
- if (symndx == -1)
- {
- h = NULL;
- sym = NULL;
- addend = 0;
- }
- else
- {
- h = obj_xcoff_sym_hashes (input_bfd)[symndx];
- sym = syms + symndx;
- addend = - sym->n_value;
-
- }
-
- /* We build the howto information on the fly. */
-
+ /* howto */
howto.type = rel->r_type;
howto.rightshift = 0;
- howto.size = 2;
howto.bitsize = (rel->r_size & 0x1f) + 1;
+ howto.size = howto.bitsize > 16 ? 2 : 1;
howto.pc_relative = false;
howto.bitpos = 0;
- if ((rel->r_size & 0x80) != 0)
- howto.complain_on_overflow = complain_overflow_signed;
- else
- howto.complain_on_overflow = complain_overflow_bitfield;
+ howto.complain_on_overflow = rel->r_size & 0x80 ?
+ complain_overflow_signed : complain_overflow_bitfield;
howto.special_function = NULL;
howto.name = "internal";
howto.partial_inplace = true;
- if (howto.bitsize == 32)
- howto.src_mask = howto.dst_mask = 0xffffffff;
- else
- {
- howto.src_mask = howto.dst_mask = (1 << howto.bitsize) - 1;
- if (howto.bitsize == 16)
- howto.size = 1;
- }
+ howto.src_mask = howto.dst_mask = N_ONES(howto.bitsize);
howto.pcrel_offset = false;
+ /* symbol */
val = 0;
+ addend = 0;
+ h = NULL;
+ sym = NULL;
+ symndx = rel->r_symndx;
- if (h == NULL)
+ if (-1 != symndx)
{
asection *sec;
-
- if (symndx == -1)
- {
- sec = bfd_abs_section_ptr;
- val = 0;
- }
- else
+
+ h = obj_xcoff_sym_hashes (input_bfd)[symndx];
+ sym = syms + symndx;
+ addend = - sym->n_value;
+
+ if (NULL == h)
{
sec = sections[symndx];
/* Hack to make sure we use the right TOC anchor value
- if this reloc is against the TOC anchor. */
-
+ if this reloc is against the TOC anchor. */
if (sec->name[3] == '0'
- && strcmp (sec->name, ".tc0") == 0)
- {
- val = xcoff_data (output_bfd)->toc;
- }
+ && strcmp (sec->name, ".tc0") == 0)
+ val = xcoff_data (output_bfd)->toc;
else
+ val = (sec->output_section->vma
+ + sec->output_offset
+ + sym->n_value
+ - sec->vma);
+ }
+ else
+ {
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ sec = h->root.u.def.section;
+ val = (h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if (h->root.type == bfd_link_hash_common)
{
+ sec = h->root.u.c.p->section;
val = (sec->output_section->vma
- + sec->output_offset
- + sym->n_value
- - sec->vma);
+ + sec->output_offset);
+
+ }
+ else if ((0 == (h->flags & (XCOFF_DEF_DYNAMIC | XCOFF_IMPORT)))
+ && ! info->relocateable)
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd, input_section,
+ rel->r_vaddr - input_section->vma, true)))
+ return false;
+
+ /* Don't try to process the reloc. It can't help, and
+ it may generate another error. */
+ continue;
}
}
}
- else
- {
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- asection *sec;
-
- sec = h->root.u.def.section;
- val = (h->root.u.def.value
- + sec->output_section->vma
- + sec->output_offset);
- }
- else if (h->root.type == bfd_link_hash_common)
- {
- asection *sec;
-
- sec = h->root.u.c.p->section;
- val = (sec->output_section->vma
- + sec->output_offset);
- }
- else if ((h->flags & XCOFF_DEF_DYNAMIC) != 0
- || (h->flags & XCOFF_IMPORT) != 0)
- {
- /* Every symbol in a shared object is defined somewhere. */
- val = 0;
- }
- else if (! info->relocateable)
- {
- if (! ((*info->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd, input_section,
- rel->r_vaddr - input_section->vma, true)))
- return false;
-
- /* Don't try to process the reloc. It can't help, and
- it may generate another error. */
- continue;
- }
- }
- /* I took the relocation type definitions from two documents:
- the PowerPC AIX Version 4 Application Binary Interface, First
- Edition (April 1992), and the PowerOpen ABI, Big-Endian
- 32-Bit Hardware Implementation (June 30, 1994). Differences
- between the documents are noted below. */
+ if (rel->r_type >= XCOFF_MAX_CALCULATE_RELOCATION
+ || (false == xcoff_calculate_relocation[rel->r_type]
+ (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
+ addend, &relocation, contents)))
+ return false;
+
+ /* address */
+ address = rel->r_vaddr - input_section->vma;
+ location = contents + address;
+
+ if (address > input_section->_raw_size)
+ abort();
+
+ /* Get the value we are going to relocate. */
+ if (1 == howto.size)
+ value_to_relocate = bfd_get_16 (input_bfd, location);
+ else
+ value_to_relocate = bfd_get_32 (input_bfd, location);
+
+ /* overflow.
+
+ FIXME: We may drop bits during the addition
+ which we don't check for. We must either check at every single
+ operation, which would be tedious, or we must do the computations
+ in a type larger than bfd_vma, which would be inefficient. */
+
+ if ((unsigned int) howto.complain_on_overflow >=
+ XCOFF_MAX_COMPLAIN_OVERFLOW)
+ abort();
- switch (rel->r_type)
+ if ((true == xcoff_complain_overflow[howto.complain_on_overflow]
+ (input_bfd, value_to_relocate, relocation, &howto)))
{
- case R_RTB:
- case R_RRTBI:
- case R_RRTBA:
- /* These relocs are defined by the PowerPC ABI to be
- relative branches which use half of the difference
- between the symbol and the program counter. I can't
- quite figure out when this is useful. These relocs are
- not defined by the PowerOpen ABI. */
- default:
- (*_bfd_error_handler)
- (_("%s: unsupported relocation type 0x%02x"),
- bfd_archive_filename (input_bfd), (unsigned int) rel->r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- case R_POS:
- /* Simple positive relocation. */
- break;
- case R_NEG:
- /* Simple negative relocation. */
- val = - val;
- break;
- case R_REL:
- /* Simple PC relative relocation. */
- howto.pc_relative = true;
- break;
- case R_TOC:
- /* TOC relative relocation. The value in the instruction in
- the input file is the offset from the input file TOC to
- the desired location. We want the offset from the final
- TOC to the desired location. We have:
- isym = iTOC + in
- iinsn = in + o
- osym = oTOC + on
- oinsn = on + o
- so we must change insn by on - in.
- */
- case R_GL:
- /* Global linkage relocation. The value of this relocation
- is the address of the entry in the TOC section. */
- case R_TCL:
- /* Local object TOC address. I can't figure out the
- difference between this and case R_GL. */
- case R_TRL:
- /* TOC relative relocation. A TOC relative load instruction
- which may be changed to a load address instruction.
- FIXME: We don't currently implement this optimization. */
- case R_TRLA:
- /* TOC relative relocation. This is a TOC relative load
- address instruction which may be changed to a load
- instruction. FIXME: I don't know if this is the correct
- implementation. */
- if (h != NULL && h->smclas != XMC_TD)
+ const char *name;
+ char buf[SYMNMLEN + 1];
+ char reloc_type_name[10];
+
+ if (symndx == -1)
{
- if (h->toc_section == NULL)
- {
- (*_bfd_error_handler)
- (_("%s: TOC reloc at 0x%x to symbol `%s' with no TOC entry"),
- bfd_archive_filename (input_bfd), rel->r_vaddr,
- h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
-
- BFD_ASSERT ((h->flags & XCOFF_SET_TOC) == 0);
- val = (h->toc_section->output_section->vma
- + h->toc_section->output_offset);
- }
-
- val = ((val - xcoff_data (output_bfd)->toc)
- - (sym->n_value - xcoff_data (input_bfd)->toc));
- addend = 0;
- break;
- case R_BA:
- /* Absolute branch. We don't want to mess with the lower
- two bits of the instruction. */
- case R_CAI:
- /* The PowerPC ABI defines this as an absolute call which
- may be modified to become a relative call. The PowerOpen
- ABI does not define this relocation type. */
- case R_RBA:
- /* Absolute branch which may be modified to become a
- relative branch. */
- case R_RBAC:
- /* The PowerPC ABI defines this as an absolute branch to a
- fixed address which may be modified to an absolute branch
- to a symbol. The PowerOpen ABI does not define this
- relocation type. */
- case R_RBRC:
- /* The PowerPC ABI defines this as an absolute branch to a
- fixed address which may be modified to a relative branch.
- The PowerOpen ABI does not define this relocation type. */
- howto.src_mask &= ~3;
- howto.dst_mask = howto.src_mask;
- break;
- case R_BR:
- /* Relative branch. We don't want to mess with the lower
- two bits of the instruction. */
- case R_CREL:
- /* The PowerPC ABI defines this as a relative call which may
- be modified to become an absolute call. The PowerOpen
- ABI does not define this relocation type. */
- case R_RBR:
- /* A relative branch which may be modified to become an
- absolute branch. FIXME: We don't implement this,
- although we should for symbols of storage mapping class
- XMC_XO. */
- howto.pc_relative = true;
- howto.src_mask &= ~3;
- howto.dst_mask = howto.src_mask;
- break;
- case R_RL:
- /* The PowerPC AIX ABI describes this as a load which may be
- changed to a load address. The PowerOpen ABI says this
- is the same as case R_POS. */
- break;
- case R_RLA:
- /* The PowerPC AIX ABI describes this as a load address
- which may be changed to a load. The PowerOpen ABI says
- this is the same as R_POS. */
- break;
- }
-
- /* If we see an R_BR or R_RBR reloc which is jumping to global
- linkage code, and it is followed by an appropriate cror nop
- instruction, we replace the cror with lwz r2,20(r1). This
- restores the TOC after the glink code. Contrariwise, if the
- call is followed by a lwz r2,20(r1), but the call is not
- going to global linkage code, we can replace the load with a
- cror. */
- if ((rel->r_type == R_BR || rel->r_type == R_RBR)
- && h != NULL
- && h->root.type == bfd_link_hash_defined
- && (rel->r_vaddr - input_section->vma + 8
- <= input_section->_cooked_size))
- {
- bfd_byte *pnext;
- unsigned long next;
-
- pnext = contents + (rel->r_vaddr - input_section->vma) + 4;
- next = bfd_get_32 (input_bfd, pnext);
-
- /* The _ptrgl function is magic. It is used by the AIX
- compiler to call a function through a pointer. */
- if (h->smclas == XMC_GL
- || strcmp (h->root.root.string, "._ptrgl") == 0)
+ name = "*ABS*";
+ }
+ else if (h != NULL)
{
- if (next == 0x4def7b82 /* cror 15,15,15 */
- || next == 0x4ffffb82 /* cror 31,31,31 */
- || next == 0x60000000) /* ori r0,r0,0 */
- bfd_put_32 (input_bfd,
- (bfd_vma) 0x80410014, /* lwz r1,20(r1) */
- pnext);
- }
- else
+ name = h->root.root.string;
+ }
+ else
{
- if (next == 0x80410014) /* lwz r1,20(r1) */
- bfd_put_32 (input_bfd,
- (bfd_vma) 0x60000000, /* ori r0,r0,0 */
- pnext);
+ name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
+ if (name == NULL)
+ name = "UNKNOWN";
}
+ sprintf (reloc_type_name, "0x%02x", rel->r_type);
+
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, name, reloc_type_name, (bfd_vma) 0, input_bfd,
+ input_section, rel->r_vaddr - input_section->vma)))
+ return false;
}
-
- /* A PC relative reloc includes the section address. */
- if (howto.pc_relative)
- addend += input_section->vma;
-
- rstat = _bfd_final_link_relocate (&howto, input_bfd, input_section,
- contents,
- rel->r_vaddr - input_section->vma,
- val, addend);
-
- switch (rstat)
- {
- default:
- abort ();
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- {
- const char *name;
- char buf[SYMNMLEN + 1];
- char howto_name[10];
-
- if (symndx == -1)
- name = "*ABS*";
- else if (h != NULL)
- name = h->root.root.string;
- else
- {
- name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
-
- if (name == NULL)
- return false;
- }
- sprintf (howto_name, "0x%02x", rel->r_type);
-
- if (! ((*info->callbacks->reloc_overflow)
- (info, name, howto_name, (bfd_vma) 0, input_bfd,
- input_section, rel->r_vaddr - input_section->vma)))
- return false;
- }
- }
+
+ /* Add RELOCATION to the right bits of VALUE_TO_RELOCATE. */
+ value_to_relocate = ((value_to_relocate & ~howto.dst_mask) |
+ (((value_to_relocate & howto.src_mask) +
+ relocation) & howto.dst_mask));
+
+ /* Put the value back in the object file. */
+ if (1 == howto.size)
+ bfd_put_16 (input_bfd, value_to_relocate, location);
+ else
+ bfd_put_32 (input_bfd, value_to_relocate, location);
}
return true;
return true;
}
-/* This is the relocation function for the RS/6000/POWER/PowerPC.
- This is currently the only processor which uses XCOFF; I hope that
- will never change. */
+/* This is the relocation function for the PowerPC64.
+ See xcoff_ppc_relocation_section for more information. */
-static boolean
+boolean
xcoff64_ppc_relocate_section (output_bfd, info, input_bfd,
input_section, contents, relocs, syms,
sections)
bfd_vma addend;
bfd_vma val;
struct reloc_howto_struct howto;
- bfd_reloc_status_type rstat;
+ bfd_vma relocation;
+ bfd_vma value_to_relocate;
+ bfd_vma address;
+ bfd_byte *location;
/* Relocation type R_REF is a special relocation type which is
- merely used to prevent garbage collection from occurring for
- the csect including the symbol which it references. */
+ merely used to prevent garbage collection from occurring for
+ the csect including the symbol which it references. */
if (rel->r_type == R_REF)
continue;
- symndx = rel->r_symndx;
-
- if (symndx == -1)
- {
- h = NULL;
- sym = NULL;
- addend = 0;
- }
- else
- {
- h = obj_xcoff_sym_hashes (input_bfd)[symndx];
- sym = syms + symndx;
- addend = - sym->n_value;
- }
-
- /* We build the howto information on the fly. */
-
+ /* howto */
howto.type = rel->r_type;
howto.rightshift = 0;
- howto.size = 4;
howto.bitsize = (rel->r_size & 0x3f) + 1;
+ howto.size = howto.bitsize > 16 ? (howto.bitsize > 32 ? 4 : 2) : 1;
howto.pc_relative = false;
howto.bitpos = 0;
- if ((rel->r_size & 0x80) != 0)
- howto.complain_on_overflow = complain_overflow_signed;
- else
- howto.complain_on_overflow = complain_overflow_bitfield;
+ howto.complain_on_overflow = rel->r_size & 0x80 ?
+ complain_overflow_signed : complain_overflow_bitfield;
howto.special_function = NULL;
howto.name = "internal";
howto.partial_inplace = true;
-
- if (howto.bitsize == 64)
- {
- howto.src_mask = howto.dst_mask = MINUS_ONE;
- }
- else if (howto.bitsize == 32)
- {
- howto.src_mask = howto.dst_mask = 0xffffffff;
- }
- else
- {
- howto.src_mask = howto.dst_mask = (1 << howto.bitsize) - 1;
- if (howto.bitsize == 16)
- howto.size = 1;
- }
+ howto.src_mask = howto.dst_mask = N_ONES(howto.bitsize);
howto.pcrel_offset = false;
+ /* symbol */
val = 0;
+ addend = 0;
+ h = NULL;
+ sym = NULL;
+ symndx = rel->r_symndx;
- if (h == NULL)
+ if (-1 != symndx)
{
asection *sec;
-
- if (symndx == -1)
- {
- sec = bfd_abs_section_ptr;
- val = 0;
- }
- else
+
+ h = obj_xcoff_sym_hashes (input_bfd)[symndx];
+ sym = syms + symndx;
+ addend = - sym->n_value;
+
+ if (NULL == h)
{
sec = sections[symndx];
/* Hack to make sure we use the right TOC anchor value
+ sec->output_offset
+ sym->n_value
- sec->vma);
- }
-
- }
- else
- {
-
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
+ }
+ else
{
- asection *sec;
-
- sec = h->root.u.def.section;
- val = (h->root.u.def.value
- + sec->output_section->vma
- + sec->output_offset);
-
- }
- else if (h->root.type == bfd_link_hash_common)
- {
- asection *sec;
-
- sec = h->root.u.c.p->section;
- val = (sec->output_section->vma
- + sec->output_offset);
- }
- else if ((h->flags & XCOFF_DEF_DYNAMIC) != 0
- || (h->flags & XCOFF_IMPORT) != 0)
- {
- /* Every symbol in a shared object is defined somewhere. */
- val = 0;
- }
- else if (! info->relocateable)
- {
- if (! ((*info->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd, input_section,
- rel->r_vaddr - input_section->vma, true)))
- return false;
-
- /* Don't try to process the reloc. It can't help, and
- it may generate another error. */
- continue;
- }
- }
-
- /* I took the relocation type definitions from two documents:
- the PowerPC AIX Version 4 Application Binary Interface, First
- Edition (April 1992), and the PowerOpen ABI, Big-Endian
- 32-Bit Hardware Implementation (June 30, 1994). Differences
- between the documents are noted below. */
-
- switch (rel->r_type)
- {
- case R_RTB:
- case R_RRTBI:
- case R_RRTBA:
- /* These relocs are defined by the PowerPC ABI to be
- relative branches which use half of the difference
- between the symbol and the program counter. I can't
- quite figure out when this is useful. These relocs are
- not defined by the PowerOpen ABI. */
- default:
- (*_bfd_error_handler)
- (_("%s: unsupported relocation type 0x%02x"),
- bfd_archive_filename (input_bfd), (unsigned int) rel->r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- case R_POS:
- /* Simple positive relocation. */
- break;
- case R_NEG:
- /* Simple negative relocation. */
- val = - val;
- break;
- case R_REL:
- /* Simple PC relative relocation. */
- howto.pc_relative = true;
- break;
- case R_TOC:
- /* TOC relative relocation. The value in the instruction in
- the input file is the offset from the input file TOC to
- the desired location. We want the offset from the final
- TOC to the desired location. We have:
- isym = iTOC + in
- iinsn = in + o
- osym = oTOC + on
- oinsn = on + o
- so we must change insn by on - in.
- */
- case R_GL:
- /* Global linkage relocation. The value of this relocation
- is the address of the entry in the TOC section. */
- case R_TCL:
- /* Local object TOC address. I can't figure out the
- difference between this and case R_GL. */
- case R_TRL:
- /* TOC relative relocation. A TOC relative load instruction
- which may be changed to a load address instruction.
- FIXME: We don't currently implement this optimization. */
- case R_TRLA:
- /* TOC relative relocation. This is a TOC relative load
- address instruction which may be changed to a load
- instruction. FIXME: I don't know if this is the correct
- implementation. */
- if (h != NULL && h->smclas != XMC_TD)
- {
- if (h->toc_section == NULL)
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
{
- (*_bfd_error_handler)
- (_("%s: TOC reloc at 0x%x to symbol `%s' with no TOC entry"),
- bfd_archive_filename (input_bfd), rel->r_vaddr,
- h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return false;
+ sec = h->root.u.def.section;
+ val = (h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if (h->root.type == bfd_link_hash_common)
+ {
+ sec = h->root.u.c.p->section;
+ val = (sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if ((0 == (h->flags & (XCOFF_DEF_DYNAMIC | XCOFF_IMPORT)))
+ && ! info->relocateable)
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd, input_section,
+ rel->r_vaddr - input_section->vma, true)))
+ return false;
+
+ /* Don't try to process the reloc. It can't help, and
+ it may generate another error. */
+ continue;
}
-
- BFD_ASSERT ((h->flags & XCOFF_SET_TOC) == 0);
- val = (h->toc_section->output_section->vma
- + h->toc_section->output_offset);
}
-
- val = ((val - xcoff_data (output_bfd)->toc)
- - (sym->n_value - xcoff_data (input_bfd)->toc));
-
- addend = 0;
- break;
- case R_BA:
- /* Absolute branch. We don't want to mess with the lower
- two bits of the instruction. */
- case R_CAI:
- /* The PowerPC ABI defines this as an absolute call which
- may be modified to become a relative call. The PowerOpen
- ABI does not define this relocation type. */
- case R_RBA:
- /* Absolute branch which may be modified to become a
- relative branch. */
- case R_RBAC:
- /* The PowerPC ABI defines this as an absolute branch to a
- fixed address which may be modified to an absolute branch
- to a symbol. The PowerOpen ABI does not define this
- relocation type. */
- case R_RBRC:
- /* The PowerPC ABI defines this as an absolute branch to a
- fixed address which may be modified to a relative branch.
- The PowerOpen ABI does not define this relocation type. */
- howto.src_mask &= ~3;
- howto.dst_mask = howto.src_mask;
- break;
- case R_BR:
- /* Relative branch. We don't want to mess with the lower
- two bits of the instruction. */
- case R_CREL:
- /* The PowerPC ABI defines this as a relative call which may
- be modified to become an absolute call. The PowerOpen
- ABI does not define this relocation type. */
- case R_RBR:
- /* A relative branch which may be modified to become an
- absolute branch. FIXME: We don't implement this,
- although we should for symbols of storage mapping class
- XMC_XO. */
- howto.pc_relative = true;
- howto.src_mask &= ~3;
- howto.dst_mask = howto.src_mask;
- howto.size = 2;
- howto.complain_on_overflow = complain_overflow_bitfield;
- break;
- case R_RL:
- /* The PowerPC AIX ABI describes this as a load which may be
- changed to a load address. The PowerOpen ABI says this
- is the same as case R_POS. */
- break;
- case R_RLA:
- /* The PowerPC AIX ABI describes this as a load address
- which may be changed to a load. The PowerOpen ABI says
- this is the same as R_POS. */
- break;
}
-
- /* If we see an R_BR or R_RBR reloc which is jumping to global
- linkage code, and it is followed by an appropriate cror nop
- instruction, we replace the cror with ld r2,40(r1). This
- restores the TOC after the glink code. Contrariwise, if the
- call is followed by a ld r2,40(r1), but the call is not
- going to global linkage code, we can replace the load with a
- cror. */
- if ((rel->r_type == R_BR || rel->r_type == R_RBR)
- && h != NULL
- && h->root.type == bfd_link_hash_defined
- && (rel->r_vaddr - input_section->vma + 8
- <= input_section->_cooked_size))
+
+ if (rel->r_type >= XCOFF_MAX_CALCULATE_RELOCATION
+ || (false == xcoff_calculate_relocation[rel->r_type]
+ (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
+ addend, &relocation, contents)))
+ return false;
+
+ /* address */
+ address = rel->r_vaddr - input_section->vma;
+ location = contents + address;
+
+ if (address > input_section->_raw_size)
+ abort();
+
+ /* Get the value we are going to relocate. */
+ if (1 == howto.size)
+ value_to_relocate = bfd_get_16 (input_bfd, location);
+ else if (2 == howto.size)
+ value_to_relocate = bfd_get_32 (input_bfd, location);
+ else
+ value_to_relocate = bfd_get_64 (input_bfd, location);
+
+ /* overflow.
+
+ FIXME: We may drop bits during the addition
+ which we don't check for. We must either check at every single
+ operation, which would be tedious, or we must do the computations
+ in a type larger than bfd_vma, which would be inefficient. */
+
+ if ((unsigned int) howto.complain_on_overflow >=
+ XCOFF_MAX_COMPLAIN_OVERFLOW)
+ abort();
+
+ if ((true == xcoff_complain_overflow[howto.complain_on_overflow]
+ (input_bfd, value_to_relocate, relocation, &howto)))
{
- bfd_byte *pnext;
- unsigned long next;
-
- pnext = contents + (rel->r_vaddr - input_section->vma) + 4;
- next = bfd_get_32 (input_bfd, pnext);
-
-
- /* The _ptrgl function is magic. It is used by the AIX
- * compiler to call a function through a pointer.
- *
- * special case XMC_GL, global linkage
- */
- if (h->smclas == XMC_GL
- || strcmp (h->root.root.string, "._ptrgl") == 0)
+ const char *name;
+ char buf[SYMNMLEN + 1];
+ char reloc_type_name[10];
+
+ if (symndx == -1)
{
- if (next == 0x4def7b82 /* cror 15,15,15 */
- || next == 0x4ffffb82 /* cror 31,31,31 */
- || next == 0x60000000 /* ori r0,r0,0 */)
- bfd_put_32 (input_bfd, (bfd_vma) 0xe8410028 /* ld r2,40(r1) */,
- pnext);
- }
- else
+ name = "*ABS*";
+ }
+ else if (h != NULL)
+ {
+ name = h->root.root.string;
+ }
+ else
{
- if (next == 0xe8410028 /* ld r2,40(r1) */)
- bfd_put_32 (input_bfd, (bfd_vma) 0x60000000 /* ori r0,r0,0 */,
- pnext);
+ name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
+ if (name == NULL)
+ name = "UNKNOWN";
}
+ sprintf (reloc_type_name, "0x%02x", rel->r_type);
+
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, name, reloc_type_name, (bfd_vma) 0, input_bfd,
+ input_section, rel->r_vaddr - input_section->vma)))
+ return false;
}
- /* A PC relative reloc includes the section address. */
- if (howto.pc_relative)
- addend += input_section->vma;
-
- rstat = _bfd_final_link_relocate (&howto, input_bfd, input_section,
- contents,
- rel->r_vaddr - input_section->vma,
- val, addend);
-
- switch (rstat)
- {
- default:
- abort ();
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- {
- const char *name;
- char buf[SYMNMLEN + 1];
- char howto_name[10];
-
- if (symndx == -1)
- name = "*ABS*";
- else if (h != NULL)
- name = h->root.root.string;
- else
- {
- name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
- if (name == NULL)
- return false;
- }
- sprintf (howto_name, "0x%02x", rel->r_type);
-
- if (! ((*info->callbacks->reloc_overflow)
- (info, name, howto_name, (bfd_vma) 0, input_bfd,
- input_section, rel->r_vaddr - input_section->vma)))
- return false;
- }
- }
+ /* Add RELOCATION to the right bits of VALUE_TO_RELOCATE. */
+ value_to_relocate = ((value_to_relocate & ~howto.dst_mask) |
+ (((value_to_relocate & howto.src_mask) +
+ relocation) & howto.dst_mask));
+
+ /* Put the value back in the object file. */
+ if (1 == howto.size)
+ bfd_put_16 (input_bfd, value_to_relocate, location);
+ else if (2 == howto.size)
+ bfd_put_32 (input_bfd, value_to_relocate, location);
+ else
+ bfd_put_64 (input_bfd, value_to_relocate, location);
+
}
-
return true;
}
projects / binutils-gdb.git / commitdiff