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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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6
binutils/ChangeLog
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@ -1,3 +1,9 @@
2019-05-24 Szabolcs Nagy <szabolcs.nagy@arm.com>
* 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.
2019-05-24 Alan Modra <amodra@gmail.com> 2019-05-24 Alan Modra <amodra@gmail.com>
* objdump.c (disassemble_bytes): Set WIDE_OUTPUT in flags. * objdump.c (disassemble_bytes): Set WIDE_OUTPUT in flags.

20
binutils/readelf.c
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@ -1810,6 +1810,7 @@ get_aarch64_dynamic_type (unsigned long type)
{ {
case DT_AARCH64_BTI_PLT: return "AARCH64_BTI_PLT"; case DT_AARCH64_BTI_PLT: return "AARCH64_BTI_PLT";
case DT_AARCH64_PAC_PLT: return "AARCH64_PAC_PLT"; case DT_AARCH64_PAC_PLT: return "AARCH64_PAC_PLT";
case DT_AARCH64_VARIANT_PCS: return "AARCH64_VARIANT_PCS";
default: default:
return NULL; return NULL;
} }
@ -11101,6 +11102,22 @@ get_solaris_symbol_visibility (unsigned int visibility)
} }
} }
static const char *
get_aarch64_symbol_other (unsigned int other)
{
static char buf[32];
if (other & STO_AARCH64_VARIANT_PCS)
{
other &= ~STO_AARCH64_VARIANT_PCS;
if (other == 0)
return "VARIANT_PCS";
snprintf (buf, sizeof buf, "VARIANT_PCS | %x", other);
return buf;
}
return NULL;
}
static const char * static const char *
get_mips_symbol_other (unsigned int other) get_mips_symbol_other (unsigned int other)
{ {
@ -11212,6 +11229,9 @@ get_symbol_other (Filedata * filedata, unsigned int other)
switch (filedata->file_header.e_machine) switch (filedata->file_header.e_machine)
{ {
case EM_AARCH64:
result = get_aarch64_symbol_other (other);
break;
case EM_MIPS: case EM_MIPS:
result = get_mips_symbol_other (other); result = get_mips_symbol_other (other);
break; break;

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> 2019-05-24 Alan Modra <amodra@gmail.com>
* elf/ppc64.h (R_PPC64_PLTSEQ_NOTOC, R_PPC64_PLTCALL_NOTOC), * elf/ppc64.h (R_PPC64_PLTSEQ_NOTOC, R_PPC64_PLTCALL_NOTOC),

5
include/elf/aarch64.h
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@ -38,6 +38,11 @@
/* Processor specific dynamic array tags. */ /* Processor specific dynamic array tags. */
#define DT_AARCH64_BTI_PLT (DT_LOPROC + 1) #define DT_AARCH64_BTI_PLT (DT_LOPROC + 1)
#define DT_AARCH64_PAC_PLT (DT_LOPROC + 3) #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. */ /* Relocation types. */