clean up and refactor program initialization

[musl] / src / env / __libc_start_main.c

diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index a38569d..07613a5 100644 (file)
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -1,24 +1,36 @@
+#include <elf.h>
 #include "libc.h"
 
 void __init_tls(size_t *);
 void __init_security(size_t *);
 
+#define AUX_CNT 38
+
+void __init_libc(char **envp)
+{
+       size_t i, *auxv, aux[AUX_CNT];
+       __environ = envp;
+       for (i=0; envp[i]; i++);
+       libc.auxv = auxv = (void *)(envp+i+1);
+       for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
+       __hwcap = aux[AT_HWCAP];
+
+       __init_tls(aux);
+       __init_security(aux);
+}
+
 int __libc_start_main(
        int (*main)(int, char **, char **), int argc, char **argv,
        int (*init)(int, char **, char **), void (*fini)(void),
        void (*ldso_fini)(void))
 {
-       char **envp = argv+argc+1, **auxv = envp;
+       char **envp = argv+argc+1;
+
+       __init_libc(envp);
 
-       __environ = envp;
-       do auxv++; while (*auxv);
-       libc.auxv = (void *)++auxv;
        libc.ldso_fini = ldso_fini;
        libc.fini = fini;
 
-       __init_tls((void *)auxv);
-       __init_security((void *)auxv);
-
        /* Execute constructors (static) linked into the application */
        if (init) init(argc, argv, envp);