add support for init/finit (constructors and destructors)

[musl] / crt / x86_64 / crt1.s

diff --git a/crt/x86_64/crt1.s b/crt/x86_64/crt1.s
index 45cbb9d..50222f1 100644 (file)
--- a/crt/x86_64/crt1.s
+++ b/crt/x86_64/crt1.s
@@ -1,4 +1,6 @@
 /* Written 2011 Nicholas J. Kain, released as Public Domain */
+.weak _init
+.weak _fini
 .text
 .global _start
 _start:
@@ -9,8 +11,8 @@ _start:
        andq $-16,%rsp  /* align stack pointer */
        push %rax       /* 8th arg: glibc ABI compatible */
        push %rsp       /* 7th arg: glibc ABI compatible */
-       xor %r8,%r8     /* 5th arg: always 0 */
-       xor %rcx,%rcx   /* 4th arg: always 0 */
+       mov $_fini,%r8  /* 5th arg: fini/dtors function */
+       mov $_init,%rcx /* 4th arg: init/ctors function */
        mov $main,%rdi  /* 1st arg: application entry ip */
        call __libc_start_main /* musl init will run the program */
-.L0:   jmp .L0
+1:     jmp 1b