ref: cb2a50f6b3ada53a03cd211c79f920979edc0a25
dir: /rt/common.s/
.text /* * counts the length of the string pointed to * by %r8, returning len in %r9. Does not modify * any registers outside of %r9 */ cstrlen: xorq %r9,%r9 jmp .lentest .lenloop: incq %r9 .lentest: cmpb $0,(%r8,%r9) jne .lenloop ret /* * Counts the size of the null terminated string vector * pointed to by %rbx. Clobbers %r10,%r11 */ count: xorq %r9,%r9 movq %rbx,%r11 .countloop: movq (%r11),%r10 testq %r10,%r10 jz .countdone addq $1,%r9 addq $8,%r11 jmp .countloop .countdone: ret /* * iterate over the strings for argc, and put * them into the args array. * * argc in %rax, argv in %rbx, dest vector in %rcx */ cvt: jmp .cvttest .cvtloop: subq $1,%rax movq (%rbx),%r8 call cstrlen movq %r8, (%rcx) movq %r9, 8(%rcx) addq $8, %rbx addq $16, %rcx .cvttest: testq %rax,%rax jnz .cvtloop .cvtdone: ret