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(enum bfd_reloc_code_real): Add some Alpha relocation types. Reorganized some 

of the existing ones.
This commit is contained in:
Ken Raeburn 1994-01-19 23:51:41 +00:00
parent 5802eb8f93
commit 563eb766b1
1 changed files with 71 additions and 14 deletions
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85
bfd/reloc.c
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@ -1032,6 +1032,7 @@ _bfd_relocate_contents (howto, input_bfd, relocation, location)
bfd_vma check;
bfd_signed_vma signed_check;
bfd_vma add;
bfd_signed_vma signed_add;
if (howto->rightshift == 0)
{
@ -1056,18 +1057,24 @@ _bfd_relocate_contents (howto, input_bfd, relocation, location)
/* Add in the value from the object file, shifted down so that
it is a straight number. */
add = x & howto->src_mask;
if ((add & (((~ howto->src_mask) >> 1) & howto->src_mask)) == 0)
signed_add = add;
else
signed_add = add | ((bfd_vma) -1 &~ howto->src_mask);
if (howto->bitpos == 0)
{
check += add;
signed_check += add;
signed_check += signed_add;
}
else
{
add >>= howto->bitpos;
check += add;
signed_check += (add
| ((bfd_vma) -1
&~ ((bfd_vma) -1 >> howto->bitpos)));
check += add >> howto->bitpos;
if (signed_add >= 0)
signed_check += signed_add >> howto->bitpos;
else
signed_check += ((signed_add >> howto->bitpos)
| ((bfd_vma) -1
&~ ((bfd_vma) -1 >> howto->bitpos)));
}
switch (howto->complain_on_overflow)
@ -1184,6 +1191,7 @@ CODE_FRAGMENT
. BFD_RELOC_64,
. BFD_RELOC_32,
. BFD_RELOC_16,
. BFD_RELOC_14,
. BFD_RELOC_8,
.
. {* PC-relative relocations *}
@ -1208,6 +1216,10 @@ CODE_FRAGMENT
. {* 32-bit pc-relative, shifted right 2 bits (i.e., 30-bit
. word displacement, e.g. for SPARC) *}
. BFD_RELOC_32_PCREL_S2,
. {* signed 16-bit pc-relative, shifted right 2 bits (e.g. for MIPS) *}
. BFD_RELOC_16_PCREL_S2,
. {* this is used on the Alpha *}
. BFD_RELOC_23_PCREL_S2,
.
. {* High 22 bits of 32-bit value, placed into lower 22 bits of
. target word; simple reloc. *}
@ -1215,6 +1227,13 @@ CODE_FRAGMENT
. {* Low 10 bits. *}
. BFD_RELOC_LO10,
.
. {* For systems that allocate a Global Pointer register, these are
. displacements off that register. These relocation types are
. handled specially, because the value the register will have is
. decided relatively late. *}
. BFD_RELOC_GPREL16,
. BFD_RELOC_GPREL32,
.
. {* Reloc types used for i960/b.out. *}
. BFD_RELOC_I960_CALLJ,
.
@ -1256,13 +1275,50 @@ CODE_FRAGMENT
. BFD_RELOC_SPARC_LO7,
. {* end-sanitize-v9 *}
.
. {* Alpha ECOFF relocations. Some of these treat the symbol or "addend"
. in some special way. *}
. {* For GPDISP_HI16 ("gpdisp") relocations, the symbol is ignored when
. writing; when reading, it will be the absolute section symbol. The
. addend is the displacement in bytes of the "lda" instruction from
. the "ldah" instruction (which is at the address of this reloc). *}
. BFD_RELOC_ALPHA_GPDISP_HI16,
. {* For GPDISP_LO16 ("ignore") relocations, the symbol is handled as
. with GPDISP_HI16 relocs. The addend is ignored when writing the
. relocations out, and is filled in with the file's GP value on
. reading, for convenience. *}
. BFD_RELOC_ALPHA_GPDISP_LO16,
.
. {* The Alpha LITERAL/LITUSE relocs are produced by a symbol reference;
. the assembler turns it into a LDQ instruction to load the address of
. the symbol, and then fills in a register in the real instruction.
.
. The LITERAL reloc, at the LDQ instruction, refers to the .lita
. section symbol. The addend is ignored when writing, but is filled
. in with the file's GP value on reading, for convenience, as with the
. GPDISP_LO16 reloc.
.
. The LITUSE reloc, on the instruction using the loaded address, gives
. information to the linker that it might be able to use to optimize
. away some literal section references. The symbol is ignored (read
. as the absolute section symbol), and the "addend" indicates the type
. of instruction using the register:
. 1 - "memory" fmt insn
. 2 - byte-manipulation (byte offset reg)
. 3 - jsr (target of branch)
.
. The GNU linker currently doesn't do any of this optimizing. *}
. BFD_RELOC_ALPHA_LITERAL,
. BFD_RELOC_ALPHA_LITUSE,
.
. {* The HINT relocation indicates a value that should be filled into the
. "hint" field of a jmp/jsr/ret instruction, for possible branch-
. prediction logic which may be provided on some processors. *}
. BFD_RELOC_ALPHA_HINT,
.
. {* Bits 27..2 of the relocation address shifted right 2 bits;
. simple reloc otherwise. *}
. BFD_RELOC_MIPS_JMP,
.
. {* signed 16-bit pc-relative, shifted right 2 bits (e.g. for MIPS) *}
. BFD_RELOC_16_PCREL_S2,
.
. {* High 16 bits of 32-bit value; simple reloc. *}
. BFD_RELOC_HI16,
. {* High 16 bits of 32-bit value but the low 16 bits will be sign
@ -1273,8 +1329,8 @@ CODE_FRAGMENT
. {* Low 16 bits. *}
. BFD_RELOC_LO16,
.
. {* 16 bit relocation relative to the global pointer. *}
. BFD_RELOC_MIPS_GPREL,
. {* relocation relative to the global pointer. *}
.#define BFD_RELOC_MIPS_GPREL BFD_RELOC_GPREL16
.
. {* Relocation against a MIPS literal section. *}
. BFD_RELOC_MIPS_LITERAL,
@ -1282,7 +1338,7 @@ CODE_FRAGMENT
. {* MIPS ELF relocations. *}
. BFD_RELOC_MIPS_GOT16,
. BFD_RELOC_MIPS_CALL16,
. BFD_RELOC_MIPS_GPREL32,
.#define BFD_RELOC_MIPS_GPREL32 BFD_RELOC_GPREL32
.
. {* These are, so far, specific to HPPA processors. I'm not sure that some
. don't duplicate other reloc types, such as BFD_RELOC_32 and _32_PCREL.
@ -1483,6 +1539,7 @@ DESCRIPTION
don't do relaxing -- i.e., does nothing.
*/
/*ARGSUSED*/
boolean
bfd_generic_relax_section (abfd, section, link_info, symbols)
bfd *abfd;
@ -1534,7 +1591,7 @@ bfd_generic_get_relocated_section_contents (abfd, link_info, link_order, data,
/* read in the section */
bfd_get_section_contents(input_bfd,
input_section,
data,
(PTR) data,
0,
input_section->_raw_size);
@ -1556,7 +1613,7 @@ bfd_generic_get_relocated_section_contents (abfd, link_info, link_order, data,
bfd_reloc_status_type r=
bfd_perform_relocation(input_bfd,
*parent,
data,
(PTR) data,
input_section,
relocateable ? abfd : (bfd *) NULL,
&error_message);