biscuit: fix sys_mmap. add syscall6

biscuit/c/libs/litc.c

@@ -86,14 +86,14 @@ static struct kinfo_t *kinfo;
 // stack is not used after munmapping it, but before calling exit(2). we use
 // this macro to make sure the clobbers are coherent for these three pieces of
 // code using syscalls.
-#define SYSCALL_CLOBBERS "cc", "memory", "r9", "r10", "r11", "r12", "r13", \
+#define SYSCALL_CLOBBERS "cc", "memory", "r10", "r11", "r12", "r13", \
 			 "r14", "r15"
 long
-syscall(long a1, long a2, long a3, long a4,
-    long a5, long trap)
+syscall6(long a1, long a2, long a3, long a4, long a5, long a6, long trap)
 {
 	long ret;
 	register long r8 asm("r8") = a5;
+	register long r9 asm("r9") = a6;
 
 	// we may want to follow the sys5 abi and have the kernel restore
 	// r14-r15 too...
@@ -102,12 +102,19 @@ syscall(long a1, long a2, long a3, long a4,
 		"leaq	2(%%rip), %%r11\n"
 		"syscall\n"
 		: "=a"(ret)
-		: "0"(trap), "D"(a1), "S"(a2), "d"(a3), "c"(a4), "r"(r8)
+		: "0"(trap), "D"(a1), "S"(a2), "d"(a3), "c"(a4), "r"(r8), "r"(r9)
 		: SYSCALL_CLOBBERS);
 
 	return ret;
 }
 
+long
+syscall(long a1, long a2, long a3, long a4,
+        long a5, long trap)
+{
+    return syscall6(a1, a2, a3, a4, a5, 0, trap);
+}
+
 #define SA(x)     ((long)x)
 #define ERRNO_NZ(x) do {				\
 				if (x != 0) {		\
@@ -443,10 +450,8 @@ mknod(const char *p, mode_t m, dev_t d)
 void *
 mmap(void *addr, size_t len, int prot, int flags, int fd, long offset)
 {
-	ulong protflags = (ulong)prot << 32;
-	protflags |= flags;
 	long ret;
-	ret = syscall(SA(addr), SA(len), SA(protflags), SA(fd),
+	ret = syscall6(SA(addr), SA(len), SA(prot), SA(flags), SA(fd),
 	    SA(offset), SYS_MMAP);
 	if (ret < 0 && -ret >= ERRNO_FIRST && -ret <= ERRNO_LAST) {
 		errno = -ret;