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PowerPC64 higher REL16 relocations

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There are occasions where someone might want to build a 64-bit
pc-relative offset from 16-bit pieces.  This adds the necessary REL16
relocs corresponding to existing ADDR16 relocs that can be used to
build 64-bit absolute values.

include/
	* elf/ppc64.h (R_PPC64_REL16_HIGH, R_PPC64_REL16_HIGHA),
	(R_PPC64_REL16_HIGHER, R_PPC64_REL16_HIGHERA),
	(R_PPC64_REL16_HIGHEST, R_PPC64_REL16_HIGHESTA): Define.
	(R_PPC64_LO_DS_OPT, R_PPC64_16DX_HA): Bump value.
bfd/
	* reloc.c (BFD_RELOC_PPC64_REL16_HIGH, BFD_RELOC_PPC64_REL16_HIGHA),
	(BFD_RELOC_PPC64_REL16_HIGHER, BFD_RELOC_PPC64_REL16_HIGHERA),
	(BFD_RELOC_PPC64_REL16_HIGHEST, BFD_RELOC_PPC64_REL16_HIGHESTA):
	Define.
	* elf64-ppc.c (ppc64_elf_howto_raw): Add new REL16 howtos.
	(ppc64_elf_reloc_type_lookup): Translate new REL16 relocs.
	(ppc64_elf_check_relocs, ppc64_elf_relocate_section): Handle them.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
gas/
	* config/tc-ppc.h (TC_FORCE_RELOCATION_SUB_LOCAL): Allow ADDR16
	HIGH, HIGHA, HIGHER, HIGHERA, HIGHEST, and HIGHESTA relocs.
	Group 16-bit relocs.
	* config/tc-ppc.c (md_apply_fix): Translate those ADDR16 relocs
	to REL16 when pcrel.  Sort relocs.
This commit is contained in:
Alan Modra
2018-08-29 13:28:21 +09:30
parent f891966ff6
commit 4a9699735b
10 changed files with 150 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
include/elf/ppc64.h
View File

@ -159,14 +159,20 @@ START_RELOC_NUMBERS (elf_ppc64_reloc_type)
RELOC_NUMBER (R_PPC64_PLTCALL, 120)
#ifndef RELOC_MACROS_GEN_FUNC
/* Relocation only used internally by ld. If you need to use these
reloc numbers, you can change them to some other unused value
/* Relocation only used internally by gas or ld. If you need to use
these reloc numbers, you can change them to some other unused value
without affecting the ABI. They will never appear in object files. */
RELOC_NUMBER (R_PPC64_LO_DS_OPT, 128)
/* Reloc only used internally by gas. As above, value is unimportant. */
RELOC_NUMBER (R_PPC64_16DX_HA, 129)
RELOC_NUMBER (R_PPC64_LO_DS_OPT, 200)
RELOC_NUMBER (R_PPC64_16DX_HA, 201)
#endif
RELOC_NUMBER (R_PPC64_REL16_HIGH, 240)
RELOC_NUMBER (R_PPC64_REL16_HIGHA, 241)
RELOC_NUMBER (R_PPC64_REL16_HIGHER, 242)
RELOC_NUMBER (R_PPC64_REL16_HIGHERA, 243)
RELOC_NUMBER (R_PPC64_REL16_HIGHEST, 244)
RELOC_NUMBER (R_PPC64_REL16_HIGHESTA, 245)
/* Power9 split rel16 for addpcis. */
RELOC_NUMBER (R_PPC64_REL16DX_HA, 246)