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[tests] Regression test for EGL-glibc TLS conflict #5

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[tests] Regression test for EGL-glibc TLS conflict #5

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29 changes: 29 additions & 0 deletions libhybris/hybris/tests/test_glesv2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,23 @@
#include <math.h>
#include <stddef.h>

/* Regression test: make sure that there's no conflict between
* the TLS (thread-local storage) slots used via libEGL/bionic
* and the TLS space allocated by the host toolchain. The array
* declared here should remain unchanged regardless of GL activity.
* Since this array is the first __thread storage declared in the main
* program, glibc will allocate it before any others.
*/
#define SLOT_FILLER (void *) 0x11122111 /* arbitrary non-zero value */
#define S SLOT_FILLER
__thread void *tls_space[64] = {
S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S,
S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S,
S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S,
S, S, S, S, S, S, S, S, S, S, S, S, S, S, S, S,
};
#undef S

const char vertex_src [] =
" \
attribute vec4 position; \
Expand Down Expand Up @@ -175,6 +192,18 @@ int main(int argc, char **argv)
printf("terminated\n");
android_dlclose(baz);
#endif

int bad_tls = 0;
for (i=0; i<64; ++i) {
if (tls_space[i] != SLOT_FILLER) {
printf("TLS array slot %d polluted: %p\n", i, tls_space[i]);
bad_tls++;
}
}
if (bad_tls)
return 1;

return 0;
}

// vim:ts=4:sw=4:noexpandtab