Initial revision

1987-01-08 10:41:08 +00:00
parent 037c2426ab
commit c2805a25bd
54 changed files with 671 additions and 0 deletions
--- a/mach/i86/libsys/brk.s
+++ b/mach/i86/libsys/brk.s
@@ -0,0 +1,39 @@
+.sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
+.define _brk
+.define xbrk
+.define np
+.extern _brk
+.extern xbrk
+.extern np, cerror
+_brk:	
+	mov bx,sp
+	mov ax,2(bx)
+	mov cx,sp
+	sub cx,128
+	jbe 1f
+	mov bx,(np)
+	mov (np),ax
+	sub ax,bx
+	jbe 2f
+	call xbrk
+2:
+	xor ax,ax
+	ret
+1:
+	mov ax,0xc
+	jmp cerror
+xbrk:
+	push di
+	mov di,bx
+	mov cx,ax
+	xor ax,ax
+	shr cx,1
+	repz stos
+	jae 3f
+	stosb
+3:
+	pop di
+	ret
+.sect .data
+np: .data2 0
+.sect .text