Adjust for new NaCl startup ABI

sysdeps/nacl/dl-sysdep.c

Index: sysdeps/nacl/dl-sysdep.c
diff --git a/sysdeps/nacl/dl-sysdep.c b/sysdeps/nacl/dl-sysdep.c
new file mode 100644
index 0000000000000000000000000000000000000000..8cd36549b1bc665cc09ff808515d2d232c28ef1b
--- /dev/null
+++ b/sysdeps/nacl/dl-sysdep.c
@@ -0,0 +1,16 @@
+/* The COOKIE is the argument to _dl_start, which is passed through from
+   the first C function argument set up by the NaCl trusted runtime's
+   startup sequence.  We extract the arguments et al from here rather
+   than from the traditional Unix/ELF stack setup.  */
+
+#define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp)	\
+  do {                                                          \
+    uint32_t *_info = (void *) (cookie);                        \
+    int _envc = _info[1];                                       \
+    (argc) = _info[2];                                          \
+    (argv) = (void *) &_info[3];                                \
+    (envp) = &(argv)[(argc) + 1];                               \
+    (auxp) = (void *) &(envp)[_envc + 1];                       \
+  } while (0)
+
+#include <sysdeps/unix/sysv/linux/dl-sysdep.c>