# HG changeset patch
# User Mike Pavone <pavone@retrodev.com>
# Date 1403543524 14400
# Node ID e13f4fd9cf6dbeb825bea6fa98245bd851e3d1ce
# Parent  666adeba5a6184c179f3a56dbbc21bd504e7fc66
Ensure proper stack alignment when the Z80 calls into C code. This fixes a crash in optimized builds on OSX

diff -r 666adeba5a61 -r e13f4fd9cf6d zruntime.S
--- a/zruntime.S	Mon Jun 23 11:46:56 2014 -0400
+++ b/zruntime.S	Mon Jun 23 13:12:04 2014 -0400
@@ -150,7 +150,15 @@
 	call z80_save_context
 	mov %r13w, %di
 	push %rsi
+	test $8, %rsp
+	jnz 0f
 	call z80_read_ym
+	jmp 1f
+0:
+	sub $8, %rsp
+	call z80_read_ym
+	add $8, %rsp
+1:
 	pop %rsi
 	mov %al, %r13b
 	call z80_load_context
@@ -196,7 +204,15 @@
 	call z80_save_context
 	mov %r14w, %di
 	mov %r13b, %dl
+	test $8, %rsp
+	jnz 0f
 	call z80_write_ym
+	jmp 1f
+0:
+	sub $8, %rsp
+	call z80_write_ym
+	add $8, %rsp
+1:
 	mov %rax, %rsi
 	jmp z80_load_context
 z80_write_bank_reg:
@@ -219,7 +235,15 @@
 	call z80_save_context
 	mov %r14w, %di
 	mov %r13b, %dl
+	test $8, %rsp
+	jnz 0f
 	call z80_vdp_port_write
+	jmp 1f
+0:
+	sub $8, %rsp
+	call z80_vdp_port_write
+	add $8, %rsp
+1:
 	mov %rax, %rsi
 	jmp z80_load_context