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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /arch/h8300/lib/modsi3.S
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/h8300/lib/modsi3.S')
-rw-r--r--arch/h8300/lib/modsi3.S72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/h8300/lib/modsi3.S b/arch/h8300/lib/modsi3.S
new file mode 100644
index 000000000..68b1dfc32
--- /dev/null
+++ b/arch/h8300/lib/modsi3.S
@@ -0,0 +1,72 @@
+#include "libgcc.h"
+
+; numerator in A0/A1
+; denominator in A2/A3
+ .global __modsi3
+__modsi3:
+ PUSHP S2P
+ bsr modnorm
+ bsr __divsi3
+ mov.l er3,er0
+ bra exitdiv
+
+ .global __umodsi3
+__umodsi3:
+ bsr __udivsi3
+ mov.l er3,er0
+ rts
+
+ .global __divsi3
+__divsi3:
+ PUSHP S2P
+ jsr divnorm
+ bsr __udivsi3
+
+ ; examine what the sign should be
+exitdiv:
+ btst #3,S2L
+ beq reti
+
+ ; should be -ve
+ neg.l A0P
+
+reti:
+ POPP S2P
+ rts
+
+divnorm:
+ mov.l A0P,A0P ; is the numerator -ve
+ stc ccr,S2L ; keep the sign in bit 3 of S2L
+ bge postive
+
+ neg.l A0P ; negate arg
+
+postive:
+ mov.l A1P,A1P ; is the denominator -ve
+ bge postive2
+
+ neg.l A1P ; negate arg
+ xor.b #0x08,S2L ; toggle the result sign
+
+postive2:
+ rts
+
+;; Basically the same, except that the sign of the divisor determines
+;; the sign.
+modnorm:
+ mov.l A0P,A0P ; is the numerator -ve
+ stc ccr,S2L ; keep the sign in bit 3 of S2L
+ bge mpostive
+
+ neg.l A0P ; negate arg
+
+mpostive:
+ mov.l A1P,A1P ; is the denominator -ve
+ bge mpostive2
+
+ neg.l A1P ; negate arg
+
+mpostive2:
+ rts
+
+ .end