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| author | Ori Bernstein <ori@eigenstate.org> | 2014-08-11 19:53:38 -0400 |
|---|---|---|
| committer | Ori Bernstein <ori@eigenstate.org> | 2014-08-11 19:53:38 -0400 |
| commit | 11ff08b7c5d3d682628b27e0a37b9d7e4deb28b7 (patch) | |
| tree | 1d82cd27ac8266ae26fbcc719729a0cd0df6e785 /rt | |
| parent | 1cf88db2a534c237b99a86603d2ecca8c1d37756 (diff) | |
| download | mc-11ff08b7c5d3d682628b27e0a37b9d7e4deb28b7.tar.gz | |
Add missing file.
Diffstat (limited to 'rt')
| -rw-r--r-- | rt/common.s | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/rt/common.s b/rt/common.s new file mode 100644 index 0000000..7eb2aeb --- /dev/null +++ b/rt/common.s @@ -0,0 +1,57 @@ +.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 + |