Index: fusl/src/internal/fdpic_crt.h |
diff --git a/fusl/src/internal/fdpic_crt.h b/fusl/src/internal/fdpic_crt.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..7eb50c6bd12a3b5e1b0ffdf519b0981597368128 |
--- /dev/null |
+++ b/fusl/src/internal/fdpic_crt.h |
@@ -0,0 +1,28 @@ |
+#include <stdint.h> |
+ |
+__attribute__((__visibility__("hidden"))) |
+void *__fdpic_fixup(void *map, uintptr_t *a, uintptr_t *z) |
+{ |
+ /* If map is a null pointer, the program was loaded by a |
+ * non-FDPIC-aware ELF loader, and fixups are not needed, |
+ * but the value for the GOT pointer is. */ |
+ if (!map) return (void *)z[-1]; |
+ |
+ struct { |
+ unsigned short version, nsegs; |
+ struct fdpic_loadseg { |
+ uintptr_t addr, p_vaddr, p_memsz; |
+ } segs[]; |
+ } *lm = map; |
+ int nsegs = lm->nsegs, rseg = 0, vseg = 0; |
+ for (;;) { |
+ while (*a-lm->segs[rseg].p_vaddr >= lm->segs[rseg].p_memsz) |
+ if (++rseg == nsegs) rseg = 0; |
+ uintptr_t *r = (uintptr_t *) |
+ (*a + lm->segs[rseg].addr - lm->segs[rseg].p_vaddr); |
+ if (++a == z) return r; |
+ while (*r-lm->segs[vseg].p_vaddr >= lm->segs[vseg].p_memsz) |
+ if (++vseg == nsegs) vseg = 0; |
+ *r += lm->segs[vseg].addr - lm->segs[vseg].p_vaddr; |
+ } |
+} |