Move __libc_int0x80 to an assembly file
Bug: http://b/157081822
If __libc_int0x80 is in a C/C++ file, Clang's coverage instrumentation
adds instructions to count the number of times it gets executed [1].
With coverage instrumentation, __libc_sysinfo, used on 32-bit x86, is
initialized to the wrong value, causing dl.preinit_system_calls to fail.
Moving the function to an assembly file leaves __libc_sysinfo properly
initialized.
[1] We could change clang so it doesn't instrument functions marked
__attribute__((naked)) as a followup.
Test: `m CLANG_COVERAGE=true NATIVE_COVERAGE_PATHS=bionic` and run
bionic-unit-tests
Change-Id: I73558253512392d345de8d5b66d38bb14b308fdf
diff --git a/libc/Android.bp b/libc/Android.bp
index 6a3a7c0..0451cfd 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -170,6 +170,7 @@
x86: {
srcs: [
"arch-x86/bionic/__libc_init_sysinfo.cpp",
+ "arch-x86/bionic/__libc_int0x80.S",
"arch-x86/bionic/__set_tls.cpp",
],
},