Changeset 8e7c9fe in mainline for uspace/lib/math/arch/ia32/src/trunc.S

Timestamp:

2014-09-12T03:45:25Z (10 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c53b58e

Parents:

3eb0c85 (diff), 105d8d6 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

merge mainline changes

most usb changes were reverted. blink and usbmass were fixed
known problems:
ehci won't initialize
usbmast asserts on unmount (happens on mainline too)

File:

• uspace/lib/math/arch/ia32/src/trunc.S (moved) (moved from uspace/app/msim/Makefile.msim.src ) (2 diffs)

uspace/lib/math/arch/ia32/src/trunc.S

@@ -1 +1 @@
 #
-# Copyright (c) 2012 Vojtech Horky
+# Copyright (c) 2014 Martin Decky
 # All rights reserved.
 #
@@ -27 +27 @@
 #
 
+#include <libarch/x87.h>
 
-BINARY = msim
-LIBS = $(LIBCLUI_PREFIX)/libclui.a
-POSIX_COMPAT = y
-# Needed because MSIM is not that strict as HelenOS
-EXTRA_CFLAGS = -Wno-error -I$(LIBCLUI_PREFIX)
+.text
 
-include Makefile.sources
+.global trunc
 
-include $(USPACE_PREFIX)/Makefile.common
+trunc:
+        pushl %ebp
+        movl %esp, %ebp
+        subl $8, %esp
+        
+        # store x87 control word
+        
+        fnstcw -4(%ebp)
+        movw -4(%ebp), %ax
+        
+        # set rounding control to truncate
+        # (no masking necessary for this flag)
+        
+        orw $X87_CONTROL_WORD_RC_TRUNCATE, %ax
+        movw %ax, -8(%ebp)
+        fldcw -8(%ebp)
+        
+        # truncate
+        
+        fldl 8(%ebp)
+        frndint
+        
+        # restore original control word
+        
+        fldcw -4(%ebp)
+        
+        leave
+        ret