Initial commit.

code/unix/sys_dosa.s

@@ -0,0 +1,94 @@
+//
+// sys_dosa.s
+// x86 assembly-language DOS-dependent routines.
+
+#include "qasm.h"
+
+
+	.data
+
+	.align	4
+fpenv:
+	.long	0, 0, 0, 0, 0, 0, 0, 0
+
+	.text
+
+.globl C(MaskExceptions)
+C(MaskExceptions):
+	fnstenv	fpenv
+	orl		$0x3F,fpenv
+	fldenv	fpenv
+
+	ret
+
+#if 0
+.globl C(unmaskexceptions)
+C(unmaskexceptions):
+	fnstenv	fpenv
+	andl		$0xFFFFFFE0,fpenv
+	fldenv	fpenv
+
+	ret
+#endif
+
+	.data
+
+	.align	4
+.globl	ceil_cw, single_cw, full_cw, cw, pushed_cw
+ceil_cw:	.long	0
+single_cw:	.long	0
+full_cw:	.long	0
+cw:			.long	0
+pushed_cw:	.long	0
+
+	.text
+
+.globl C(Sys_LowFPPrecision)
+C(Sys_LowFPPrecision):
+	fldcw	single_cw
+
+	ret
+
+.globl C(Sys_HighFPPrecision)
+C(Sys_HighFPPrecision):
+	fldcw	full_cw
+
+	ret
+
+.globl C(Sys_PushFPCW_SetHigh)
+C(Sys_PushFPCW_SetHigh):
+	fnstcw	pushed_cw
+	fldcw	full_cw
+
+	ret
+
+.globl C(Sys_PopFPCW)
+C(Sys_PopFPCW):
+	fldcw	pushed_cw
+
+	ret
+
+.globl C(Sys_SetFPCW)
+C(Sys_SetFPCW):
+	fnstcw	cw
+	movl	cw,%eax
+#if	id386
+	andb	$0xF0,%ah
+	orb		$0x03,%ah	// round mode, 64-bit precision
+#endif
+	movl	%eax,full_cw
+
+#if	id386
+	andb	$0xF0,%ah
+	orb		$0x0C,%ah	// chop mode, single precision
+#endif
+	movl	%eax,single_cw
+
+#if	id386
+	andb	$0xF0,%ah
+	orb		$0x08,%ah	// ceil mode, single precision
+#endif
+	movl	%eax,ceil_cw
+
+	ret
+