lol

1 files changed, 85 insertions, 0 deletions

diff --git a/tinycc/lib/alloca.S b/tinycc/lib/alloca.S
new file mode 100644
index 0000000..6ebafd7
--- /dev/null
+++ b/tinycc/lib/alloca.S
@@ -0,0 +1,85 @@
+/* ---------------------------------------------- */
+/* alloca.S */
+
+#ifdef __leading_underscore
+# define _(s) _##s
+#else
+# define _(s) s
+#endif
+
+/* ---------------------------------------------- */
+#if defined __i386__
+
+.globl _(alloca), _(__alloca)
+_(alloca):
+_(__alloca):
+    push    %ebp
+    mov     %esp,%ebp
+    mov     8(%ebp),%eax
+    add     $3,%eax
+    and     $-4,%eax
+#ifdef _WIN32
+    jmp     .+16 #p2
+p1:
+    sub     $4096,%esp
+    sub     $4096,%eax
+    test    %eax,(%esp)
+p2:
+    cmp     $4096,%eax
+    jae     p1
+#endif
+    sub     %eax,%esp
+    mov     4(%ebp),%eax
+    mov     0(%ebp),%ebp
+    add     $8,%esp
+    push    %eax
+    lea     8(%esp),%eax
+    ret
+
+/* ---------------------------------------------- */
+#elif defined __x86_64__
+
+.globl _(alloca)
+_(alloca):
+    pop     %rdx
+#ifdef _WIN32
+    mov     %rcx,%rax
+#else
+    mov     %rdi,%rax
+#endif
+    add     $15,%rax
+    and     $-16,%rax
+    jz      p3
+
+#ifdef _WIN32
+p1:
+    cmp     $4096,%rax
+    jbe     p2
+    test    %rax,-4096(%rsp)
+    sub     $4096,%rsp
+    sub     $4096,%rax
+    jmp p1
+p2:
+#endif
+    sub     %rax,%rsp
+    mov     %rsp,%rax
+p3:
+    push    %rdx
+    ret
+
+/* ---------------------------------------------- */
+#elif defined __arm__
+
+	.text
+	.align	2
+	.global	alloca
+	.type	alloca, %function
+alloca:
+	rsb	sp, r0, sp
+	bic	sp, sp, #7
+	mov	r0, sp
+	mov	pc, lr
+	.size	alloca, .-alloca
+
+/* ---------------------------------------------- */
+#endif