ref: 69ff322bc36cc9bbdc00528ef86031f631daf925
dir: /libstd/start-osx.s/
/* * counts the length of the string pointed to * by %rbx, returning len in %r9 */ cstrlen: xorq %r9,%r9 jmp .lentest .lenloop: incq %r9 .lentest: cmpb $0,(%r8,%r9) jne .lenloop ret .globl start start: /* turn args into a slice */ movq %rsp,%rbp /* stack allocate sizeof(byte[:])*argc */ movq (%rbp),%rax imulq $16,%rax subq %rax,%rsp movq %rsp, %rdx /* saved args[:] */ /* iterate over the strings for argc, and put * them into the args array. */ movq (%rbp), %rax /* argc */ leaq 8(%rbp), %rbx /* argv */ movq %rsp, %rcx movq (%rbp), %rsi /* saved argc */ testq %rax,%rax jz .cvtdone .cvtloop: subq $1,%rax movq (%rbx),%r8 call cstrlen movq %r8, (%rcx) movq %r9, 8(%rcx) addq $8, %rbx addq $16, %rcx testq %rax,%rax jnz .cvtloop .cvtdone: pushq %rsi pushq %rdx /* enter the main program */ call _main /* exit */ movq %rax,%rdi movq $0x2000001,%rax syscall