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[AArch64] Add v8.5 Branch Target Identification support. 

The .note.gnu.property must be in the assembly file to indicate the
support for BTI otherwise BTI will be disabled for the whole library.
__unw_getcontext and libunwind::Registers_arm64::jumpto() may be called
indirectly therefore they should start with a landing pad.

Reviewed By: tamas.petz, #libunwind, compnerd

Differential Revision: https://reviews.llvm.org/D77786
This commit is contained in:
Daniel Kiss 2020-09-29 15:50:19 +02:00
parent 8b08fa0103
commit f34ae1b9de
1 changed files with 20 additions and 1 deletions
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21
libunwind/src/assembly.h
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@ -48,6 +48,24 @@
#define PPC64_OPD2
#endif
#if defined(__ARM_FEATURE_BTI_DEFAULT)
.pushsection ".note.gnu.property", "a" SEPARATOR \
.balign 8 SEPARATOR \
.long 4 SEPARATOR \
.long 0x10 SEPARATOR \
.long 0x5 SEPARATOR \
.asciz "GNU" SEPARATOR \
.long 0xc0000000 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ \
.long 4 SEPARATOR \
.long 3 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_BTI AND */ \
/* GNU_PROPERTY_AARCH64_FEATURE_1_PAC */ \
.long 0 SEPARATOR \
.popsection SEPARATOR
#define AARCH64_BTI bti c
#else
#define AARCH64_BTI
#endif
#define GLUE2(a, b) a ## b
#define GLUE(a, b) GLUE2(a, b)
#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
@ -144,7 +162,8 @@
SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
PPC64_OPD1 \
SYMBOL_NAME(name): \
PPC64_OPD2
PPC64_OPD2 \
AARCH64_BTI
#if defined(__arm__)
#if !defined(__ARM_ARCH)