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-rw-r--r--crt/x86_64/crt1.s16
1 files changed, 16 insertions, 0 deletions
diff --git a/crt/x86_64/crt1.s b/crt/x86_64/crt1.s
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--- /dev/null
+++ b/crt/x86_64/crt1.s
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+/* Written 2011 Nicholas J. Kain, released as Public Domain */
+.text
+.global _start
+_start:
+ xor %rbp,%rbp /* rbp:undefined -> mark as zero 0 (ABI) */
+ mov %rdx,%r9 /* 6th arg: ptr to register with atexit() */
+ pop %rsi /* 2nd arg: argc */
+ mov %rsp,%rdx /* 3rd arg: argv */
+ 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 $main,%rdi /* 1st arg: application entry ip */
+ call __libc_start_main /* musl init will run the program */
+.L0: jmp .L0