1 files changed, 123 insertions, 0 deletions
diff --git a/libgloss/lm32/scall.S b/libgloss/lm32/scall.S
new file mode 100644
index 0000000..db423a5
--- /dev/null
+++ b/libgloss/lm32/scall.S
@@ -0,0 +1,123 @@
+/*
+ * Lattice Mico32 system calls.
+ * Contributed by Jon Beniston <jon@beniston.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <syscall.h>
+
+/* 
+ * System call convention (as implemented in simulator:
+ *    - System call number in register r8 
+ *    - Return value in r1 and r2 (only if 64-bit value)
+ *    - errno in r3      
+ */
+
+        .extern errno
+
+        .global _write
+_write: 
+        mvi     r8, SYS_write
+        scall   
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret
+
+        .global _read
+_read:
+        mvi     r8, SYS_read
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                
+
+        .global _open
+_open:    
+        mvi     r8, SYS_open
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret
+        
+        .global _close
+_close:    
+        mvi     r8, SYS_close
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                
+            
+        .global _lseek
+_lseek:
+        mvi     r8, SYS_lseek
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret    
+                    
+        .global _fstat
+_fstat:
+        mvi     r8, SYS_fstat
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                                            
+
+        .global _stat
+_stat:
+        mvi     r8, SYS_stat
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                                            
+
+        .global _link
+_link:
+        mvi     r8, SYS_link
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                                            
+            
+        .global _unlink
+_unlink:
+        mvi     r8, SYS_unlink
+        scall
+        mvhi    r4, hi(errno)
+        ori     r4, r4, lo(errno)
+        sw      (r4+0), r3
+        ret                                            
+                        
+        .global _exit
+_exit:
+        /* This call doesn't return */
+        mvi     r8, SYS_exit
+        scall