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[unwinder] Tell the assembler that functions are functions so that the linker knows how to link them. 

This fixes an interworking problem when the unwinder/libcxxabi is built for
Thumb. When unw_getcontext is not marked as a function, 'bl' is used for the
branch instead of 'bx'.

llvm-svn: 214573
This commit is contained in:
Jonathan Roelofs 2014-08-01 22:02:21 +00:00
parent 4973a13680
commit d9dbecd74d
1 changed files with 19 additions and 0 deletions
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19
libcxxabi/src/Unwind/assembly.h
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@ -34,13 +34,32 @@
#define GLUE(a, b) GLUE2(a, b)
#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
#if defined(__APPLE__)
#define SYMBOL_IS_FUNC(name)
#elif defined(__ELF__)
#define LOCAL_LABEL(name) .L_##name
#if defined(__arm__)
#define SYMBOL_IS_FUNC(name) .type name,%function
#else
#define SYMBOL_IS_FUNC(name) .type name,@function
#endif
#else
#define SYMBOL_IS_FUNC(name) \
.def name SEPARATOR \
.scl 2 SEPARATOR \
.type 32 SEPARATOR \
.endef
#endif
#define DEFINE_LIBUNWIND_FUNCTION(name) \
.globl SYMBOL_NAME(name) SEPARATOR \
SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
SYMBOL_NAME(name):
#define DEFINE_LIBUNWIND_PRIVATE_FUNCTION(name) \
.globl SYMBOL_NAME(name) SEPARATOR \
HIDDEN_DIRECTIVE SYMBOL_NAME(name) SEPARATOR \
SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
SYMBOL_NAME(name):
#endif /* UNWIND_ASSEMBLY_H */