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Flush icache with __builtin___clear_cache() in tests when compiling with GCC
When compiling with GCC, use the builtin instruction cache flushing mechanism in all tests where it is needed. Quoting GCC docs: ''If the target does not require instruction cache flushes, __builtin___clear_cache has no effect. Otherwise either instructions are emitted in-line to clear the instruction cache or a call to the __clear_cache function in libgcc is made.''.
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3 changed files with 13 additions and 1 deletions
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@ -86,7 +86,9 @@ struct fdesc
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# define get_gp(fdesc) (0)
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#endif
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#ifndef __GNUC__
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extern void flush_cache (void *addr, size_t len);
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#endif
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void
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template (int i, template_t self,
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@ -186,7 +188,7 @@ main (int argc, char *argv[] __attribute__((unused)))
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2*getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC);
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#ifdef __GNUC__
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__clear_cache(mem, mem + MAX_FUNC_SIZE);
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__builtin___clear_cache(mem, mem + MAX_FUNC_SIZE);
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#else
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flush_cache (mem, MAX_FUNC_SIZE);
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#endif
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@ -1,3 +1,5 @@
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#ifndef __GNUC__
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#if defined(__ia64__)
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.global flush_cache
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@ -80,3 +82,5 @@ flush_cache:
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/* We do not need executable stack. */
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.section .note.GNU-stack,"",@progbits
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#endif
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#endif
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@ -20,7 +20,9 @@ int verbose;
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# define EXTRA 0
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#endif
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#ifndef __GNUC__
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extern void flush_cache (void *addr, size_t len);
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#endif
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int
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make_executable (void *addr, size_t len)
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@ -31,7 +33,11 @@ make_executable (void *addr, size_t len)
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perror ("mprotect");
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return -1;
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}
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#ifdef __GNUC__
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__builtin___clear_cache(addr, addr + len);
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#else
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flush_cache (addr, len);
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#endif
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return 0;
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}
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