From 3aec06a088e42829cb46a3e47ff2d51ef2e8af6c Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Wed, 28 Jun 1989 12:40:22 +0000
Subject: [PATCH] Added ret.s

---
 mach/z80/libem/LIST  |  1 +
 mach/z80/libem/ret.s | 57 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 mach/z80/libem/ret.s

diff --git a/mach/z80/libem/LIST b/mach/z80/libem/LIST
index b61d8d8f4..cc081f7a4 100644
--- a/mach/z80/libem/LIST
+++ b/mach/z80/libem/LIST
@@ -40,3 +40,4 @@ xor.s
 nop.s
 outdec.s
 pstrng.s
+ret.s
diff --git a/mach/z80/libem/ret.s b/mach/z80/libem/ret.s
new file mode 100644
index 000000000..bbc145b42
--- /dev/null
+++ b/mach/z80/libem/ret.s
@@ -0,0 +1,57 @@
+.define .ret
+.define .lfr
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+! 'ret' and 'lfr' for sizes > 4 (and <= 8)
+
+retarea: .space 8
+
+.sect .text
+
+.ret:
+! parameters:
+!	de: size in bytes
+!	stack: return value
+
+	pop ix		! save return address
+	ld hl,retarea
+	srl d
+	rr e		! divide size by 2
+1:
+	pop bc
+	ld (hl), c
+	inc hl
+	ld (hl), b
+	inc hl
+	dec de
+	ld a,d
+	or e
+	jr nz,1b	! done?
+	jp (ix)		! yes, return
+
+.lfr:
+! parameters:
+!	de: size in bytes
+!	result on stack: return value
+
+	pop ix		! save return address
+	ld hl,retarea
+	add hl,de
+	srl d
+	rr e		! divide size by 2
+1:
+	dec hl
+	ld b,(hl)
+	dec hl
+	ld c,(hl)
+	push bc
+	dec de
+	ld a,d
+	or e
+	jr nz,1b	! done?
+	jp (ix)		! yes, return
+