ref: c4cdbc4d2d64242bc19f8b666783ed32d13b6792
parent: 294f81566ec7b4d9c4b544b27f2446573be4c7eb
author: Ori Bernstein <[email protected]>
date: Thu Sep 27 13:56:48 EDT 2012
Add support for command line args.
--- a/libstd/start-linux.s
+++ b/libstd/start-linux.s
@@ -1,11 +1,55 @@
+/*
+ * 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 */
- /* TODO */
- /* enter the main program */
- call main
- /* exit */
- movq %rax,%rdi
- movq $60,%rax
- syscall
+ /* 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 $60,%rax
+ syscall
--- a/libstd/test.myr
+++ b/libstd/test.myr
@@ -1,10 +1,14 @@
use std
-const main = {+const main = {args : byte[:][:]var x : byte*[1024]
var sz
var i
+ std.put("args.len = %i\n", args.len)+ for i = 0; i < args.len; i++
+ std.put("args[%i] = %s\n", i, args[i])+ ;;
/* try the byte allocator for large variety of sizes. */
for sz = 1; sz < 65536; sz *= 2
for i = 0; i < 1024; i++