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aarch64: add STO_AARCH64_VARIANT_PCS and DT_AARCH64_VARIANT_PCS

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The bottom 2 bits of st_other are used for visibility, the top 6 bits are
de facto reserved for processor specific use.  This patch defines a
bits to mark function symbols that follow a variant procedure call standard
with different register usage convention.

A dynamic tag is also defined that marks modules with R_<CLS>_JUMP_SLOT
relocations referencing symbols marked with STO_AARCH64_VARIANT_PCS.
This can be used by dynamic linkers that support lazy binding to decide
what registers need to be preserved during symbol resolution.

binutils/ChangeLog:

	* readelf.c (get_aarch64_dynamic_type): Handle DT_AARCH64_VARIANT_PCS.
	(get_aarch64_symbol_other): New, handles STO_AARCH64_VARIANT_PCS.
	(get_symbol_other): Call get_aarch64_symbol_other.

include/ChangeLog:

	* elf/aarch64.h (DT_AARCH64_VARIANT_PCS): Define.
	(STO_AARCH64_VARIANT_PCS): Define.
This commit is contained in:
Szabolcs Nagy
2019-04-25 13:46:01 +01:00
parent 405b5bd86f
commit 2301ed1c9a
4 changed files with 36 additions and 0 deletions
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5
include/ChangeLog
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@ -1,3 +1,8 @@
2019-05-24 Szabolcs Nagy <szabolcs.nagy@arm.com>
* elf/aarch64.h (DT_AARCH64_VARIANT_PCS): Define.
(STO_AARCH64_VARIANT_PCS): Define.
2019-05-24 Alan Modra <amodra@gmail.com>
* elf/ppc64.h (R_PPC64_PLTSEQ_NOTOC, R_PPC64_PLTCALL_NOTOC),

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include/elf/aarch64.h
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@ -38,6 +38,11 @@
/* Processor specific dynamic array tags. */
#define DT_AARCH64_BTI_PLT (DT_LOPROC + 1)
#define DT_AARCH64_PAC_PLT (DT_LOPROC + 3)
#define DT_AARCH64_VARIANT_PCS (DT_LOPROC + 5)
/* AArch64-specific values for st_other. */
#define STO_AARCH64_VARIANT_PCS 0x80 /* Symbol may follow different call
convention from the base PCS. */
/* Relocation types. */