Handwritten asm: Register getter/setter functions (#1815)

* Handwritten asm: Register getter/setter functions

* Formatting fix

src/libultra/os/getcause.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetCause)
+    MFC0(   v0, C0_CAUSE)
+    jr      ra
+END(__osGetCause)

src/libultra/os/getcompare.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetCompare)
+    MFC0(   v0, C0_COMPARE)
+    jr      ra
+END(__osGetCompare)

src/libultra/os/getconfig.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetConfig)
+    MFC0(   v0, C0_CONFIG)
+    jr      ra
+END(__osGetConfig)

src/libultra/os/getcount.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(osGetCount)
+    MFC0(   v0, C0_COUNT)
+    jr      ra
+END(osGetCount)

src/libultra/os/getfpccsr.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetFpcCsr)
+    CFC1(   v0, C1_FPCSR)
+    jr      ra
+END(__osGetFpcCsr)

src/libultra/os/getsr.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetSR)
+    MFC0(   v0, C0_SR)
+    jr      ra
+END(__osGetSR)

src/libultra/os/getwatchlo.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osGetWatchLo)
+    MFC0(   v0, C0_WATCHLO)
+    jr      ra
+END(__osGetWatchLo)

src/libultra/os/setcause.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetCause)
+    MTC0(   a0, C0_CAUSE)
+    jr      ra
+END(__osSetCause)

src/libultra/os/setcompare.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetCompare)
+    MTC0(   a0, C0_COMPARE)
+    jr      ra
+END(__osSetCompare)

src/libultra/os/setconfig.s

@@ -0,0 +1,10 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetConfig)
+    MTC0(   a0, C0_CONFIG)
+    jr      ra
+END(__osSetConfig)

src/libultra/os/setfpccsr.s

@@ -0,0 +1,11 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetFpcCsr)
+    CFC1(   v0, fcr31)
+    CTC1(   a0, fcr31)
+    jr      ra
+END(__osSetFpcCsr)

src/libultra/os/setsr.s

@@ -0,0 +1,11 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetSR)
+    MTC0(   a0, C0_SR)
+    NOP
+    jr      ra
+END(__osSetSR)

src/libultra/os/setwatchlo.s

@@ -0,0 +1,11 @@
+#include "PR/asm.h"
+#include "PR/regdef.h"
+#include "PR/R4300.h"
+
+.text
+
+LEAF(__osSetWatchLo)
+    MTC0(   a0, C0_WATCHLO)
+    NOP
+    jr      ra
+END(__osSetWatchLo)