imported brians code

[nestedvm.git] / src / org / xwt / mips / support.s

diff --git a/src/org/xwt/mips/support.s b/src/org/xwt/mips/support.s
new file mode 100644 (file)
index 0000000..b7781d5
--- /dev/null
+++ b/src/org/xwt/mips/support.s
@@ -0,0 +1,122 @@
+#include "syscalls.h"
+
+#define zero $0
+#define v0 $2
+#define v1 $3
+#define a0 $4
+#define a1 $5
+#define a2 $6
+#define a3 $7
+#define t0 $8
+#define t1 $9
+#define ra $31
+
+/* We intentionally don't take advantage of delay slots because
+   the compiler removes them anyway */
+
+.set noreorder;
+
+#define SYSCALL(name) SYSCALL2(name,SYS_##name)
+#define SYSCALL2(name,number)  \
+    .section .text.name,"ax",@progbits; \
+    .align 2;       \
+    .globl name;    \
+    .ent name;      \
+name:               \
+    li v0, number;  \
+    syscall;        \
+    j ra;           \
+    nop;            \
+    .end name;
+
+#define SYSCALL_R(name)        \
+    .section .text._##name##_r,"ax",@progbits; \
+    .align 2;                  \
+    .globl _##name##_r;        \
+    .ent _##name##_r;          \
+_##name##_r:                   \
+    li v0, SYS_##name;         \
+    move t0, a0;               \
+    move a0, a1;               \
+    move a1, a2;               \
+    move a2, a3;               \
+    syscall;                   \
+    addu t1,v0,255;            \
+    sltu t1,t1,255;            \
+    bne t1,zero,$L##name##_errno;\
+    nop;                       \
+    j ra;                      \
+    nop;                       \
+$L##name##_errno:              \
+    move a0, t0;               \
+    move a1, v0;               \
+    j _syscall_set_errno;      \
+    nop;                       \
+    .end _##name##_r;
+
+
+    .align   2
+    .globl   _call_helper
+    .ent     _call_helper
+_call_helper:
+    subu $sp,$sp,32
+    
+    /* addr */
+    move $2,$4
+    
+    /* args 1-4 */
+    move $4,$5 
+    move $5,$6
+    move $6,$7
+    move $7,$16
+    
+    /* args 5 and 6 */
+    sw $17,16($sp)
+    sw $18,20($sp)
+    
+    /* call the func */
+    jal $31,$2
+    nop
+    
+    move $3,$2
+    li $2,SYS_pause
+    syscall
+    
+    /* shouldn't get here */
+    li $2,SYS_exit
+    li $3,1
+    syscall
+    
+    .end _call_helper
+
+SYSCALL2(_exit,SYS_exit)
+SYSCALL2(_pause,SYS_pause)
+SYSCALL_R(open)
+SYSCALL_R(close)
+SYSCALL_R(read)
+SYSCALL_R(write)
+SYSCALL_R(sbrk)
+SYSCALL_R(fstat)
+SYSCALL(isatty)
+SYSCALL_R(lseek)
+SYSCALL_R(kill)
+SYSCALL_R(getpid)
+SYSCALL2(_call_java,SYS_calljava)
+SYSCALL_R(stat)
+SYSCALL_R(gettimeofday)
+SYSCALL(sleep)
+SYSCALL_R(times)
+SYSCALL_R(mkdir)
+SYSCALL(getpagesize)
+SYSCALL_R(unlink)
+SYSCALL_R(utime)
+SYSCALL_R(chdir)
+SYSCALL_R(pipe)
+SYSCALL_R(dup2)
+SYSCALL_R(fork)
+SYSCALL_R(waitpid)
+SYSCALL_R(getcwd)
+SYSCALL_R(execve)
+SYSCALL_R(fcntl)
+SYSCALL_R(rmdir)
+SYSCALL_R(sysconf)