path: root/crt
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authorRich Felker <>2015-05-26 03:37:41 -0400
committerRich Felker <>2015-05-26 03:37:41 -0400
commitdc031ee0b1ba11baa00cd7f0769e461a5f396c71 (patch)
tree2d157d390496596007e366af3403745db2d39ac1 /crt
parented0c8249825161036356a3616e8c5247c15d0927 (diff)
add rcrt1 start file for fully static-linked PIE
static-linked PIE files need startup code to relocate themselves, much like the dynamic linker does. rcrt1.c reuses the code in dlstart.c, stage 1 of the dynamic linker, which in turn reuses crt_arch.h, to achieve static PIE with no new code. only relative relocations are supported. existing toolchains that don't yet support static PIE directly can be repurposed by passing "-shared -Wl,-Bstatic -Wl,-Bsymbolic" instead of "-static -pie" and substituting rcrt1.o in place of crt1.o. all libraries being linked must be built as PIC/PIE; TEXTRELs are not supported at this time.
Diffstat (limited to 'crt')
1 files changed, 15 insertions, 0 deletions
diff --git a/crt/rcrt1.c b/crt/rcrt1.c
new file mode 100644
index 00000000..5ac612db
--- /dev/null
+++ b/crt/rcrt1.c
@@ -0,0 +1,15 @@
+#define SHARED
+#define START "_start"
+#define _dlstart_c _start_c
+#include "../src/ldso/dlstart.c"
+int main();
+void _init() __attribute__((weak));
+void _fini() __attribute__((weak));
+_Noreturn int __libc_start_main(int (*)(), int, char **,
+ void (*)(), void(*)(), void(*)());
+_Noreturn void __dls2(unsigned char *base, size_t *sp)
+ __libc_start_main(main, *sp, (void *)(sp+1), _init, _fini, 0);