Added linux386 platform.

plat/linux386/libsys/_syscall.s

@@ -0,0 +1,47 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+#include "syscalls.h"
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .text
+
+EINVAL = 22
+	
+! Perform a Linux system call.
+
+.define __syscall
+
+__syscall:
+	mov eax, 4(esp)
+	mov ebx, 8(esp)
+	mov ecx, 12(esp)
+	mov edx, 16(esp)
+
+	int 0x80
+	or eax, eax
+	jl 1f
+	ret
+1:
+	neg eax
+	! It just so happens that errnos 1-34 are the same in Linux as in the ACK.
+	cmp eax, 1
+	jb 2f
+	cmp eax, 34
+	ja 2f
+	mov (_errno), eax
+3:
+	mov eax, -1
+	ret
+2:
+	! All other errnos become EINVAL for now. FIXME dtrg.
+	mov (_errno), EINVAL
+	jmp 3b