diff --git a/libgloss/riscv/machine/syscall.h b/libgloss/riscv/machine/syscall.h
index 391dbaa71..cc7183273 100644
--- a/libgloss/riscv/machine/syscall.h
+++ b/libgloss/riscv/machine/syscall.h
@@ -57,12 +57,14 @@
 extern long __syscall_error(long);
 
 static inline long
-__internal_syscall(long n, long _a0, long _a1, long _a2, long _a3)
+__internal_syscall(long n, long _a0, long _a1, long _a2, long _a3, long _a4, long _a5)
 {
   register long a0 asm("a0") = _a0;
   register long a1 asm("a1") = _a1;
   register long a2 asm("a2") = _a2;
   register long a3 asm("a3") = _a3;
+  register long a4 asm("a4") = _a4;
+  register long a5 asm("a5") = _a5;
 
 #ifdef __riscv_32e
   register long syscall_id asm("t0") = n;
@@ -71,7 +73,7 @@ __internal_syscall(long n, long _a0, long _a1, long _a2, long _a3)
 #endif
 
   asm volatile ("scall"
-		: "+r"(a0) : "r"(a1), "r"(a2), "r"(a3), "r"(syscall_id));
+		: "+r"(a0) : "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), "r"(syscall_id));
 
   if (a0 < 0)
     return __syscall_error (a0);
diff --git a/libgloss/riscv/syscalls.c b/libgloss/riscv/syscalls.c
index f9ec25dcd..19c69f083 100644
--- a/libgloss/riscv/syscalls.c
+++ b/libgloss/riscv/syscalls.c
@@ -69,8 +69,9 @@
 #include <unistd.h>
 #include <utime.h>
 
-#define syscall_errno(n, a, b, c, d) \
-        __internal_syscall(n, (long)(a), (long)(b), (long)(c), (long)(d))
+#define syscall_errno(n, a, b, c, d, e, f) \
+  __internal_syscall(n, (long)(a), (long)(b), (long)(c), \
+		     (long)(d), (long)(e), (long)(f))
 
 long
 __syscall_error(long a0)
@@ -83,35 +84,35 @@ __syscall_error(long a0)
 int
 _open(const char *name, int flags, int mode)
 {
-  return syscall_errno (SYS_open, name, flags, mode, 0);
+  return syscall_errno (SYS_open, name, flags, mode, 0, 0, 0);
 }
 
 /* Open file relative to given directory.  */
 int
 _openat(int dirfd, const char *name, int flags, int mode)
 {
-  return syscall_errno (SYS_openat, dirfd, name, flags, mode);
+  return syscall_errno (SYS_openat, dirfd, name, flags, mode, 0, 0);
 }
 
 /* Set position in a file.  */
 off_t
 _lseek(int file, off_t ptr, int dir)
 {
-  return syscall_errno (SYS_lseek, file, ptr, dir, 0);
+  return syscall_errno (SYS_lseek, file, ptr, dir, 0, 0, 0);
 }
 
 /* Read from a file.  */
 ssize_t
 _read(int file, void *ptr, size_t len)
 {
-  return syscall_errno (SYS_read, file, ptr, len, 0);
+  return syscall_errno (SYS_read, file, ptr, len, 0, 0, 0);
 }
 
 /* Write to a file.  */
 ssize_t
 _write(int file, const void *ptr, size_t len)
 {
-  return syscall_errno (SYS_write, file, ptr, len, 0);
+  return syscall_errno (SYS_write, file, ptr, len, 0, 0, 0);
 }
 
 struct kernel_stat
@@ -159,7 +160,7 @@ int
 _fstat(int file, struct stat *st)
 {
   struct kernel_stat kst;
-  int rv = syscall_errno (SYS_fstat, file, &kst, 0, 0);
+  int rv = syscall_errno (SYS_fstat, file, &kst, 0, 0, 0, 0);
   conv_stat (st, &kst);
   return rv;
 }
@@ -169,7 +170,7 @@ int
 _stat(const char *file, struct stat *st)
 {
   struct kernel_stat kst;
-  int rv = syscall_errno (SYS_stat, file, &kst, 0, 0);
+  int rv = syscall_errno (SYS_stat, file, &kst, 0, 0, 0, 0);
   conv_stat (st, &kst);
   return rv;
 }
@@ -179,7 +180,7 @@ int
 _lstat(const char *file, struct stat *st)
 {
   struct kernel_stat kst;
-  int rv = syscall_errno (SYS_lstat, file, &kst, 0, 0);
+  int rv = syscall_errno (SYS_lstat, file, &kst, 0, 0, 0, 0);
   conv_stat (st, &kst);
   return rv;
 }
@@ -189,7 +190,7 @@ int
 _fstatat(int dirfd, const char *file, struct stat *st, int flags)
 {
   struct kernel_stat kst;
-  int rv = syscall_errno (SYS_fstatat, dirfd, file, &kst, flags);
+  int rv = syscall_errno (SYS_fstatat, dirfd, file, &kst, flags, 0, 0);
   conv_stat (st, &kst);
   return rv;
 }
@@ -198,35 +199,35 @@ _fstatat(int dirfd, const char *file, struct stat *st, int flags)
 int
 _access(const char *file, int mode)
 {
-  return syscall_errno (SYS_access, file, mode, 0, 0);
+  return syscall_errno (SYS_access, file, mode, 0, 0, 0, 0);
 }
 
 /* Permissions of a file (by name) in a given directory.  */
 int
 _faccessat(int dirfd, const char *file, int mode, int flags)
 {
-  return syscall_errno (SYS_faccessat, dirfd, file, mode, flags);
+  return syscall_errno (SYS_faccessat, dirfd, file, mode, flags, 0, 0);
 }
 
 /* Close a file.  */
 int
 _close(int file)
 {
-  return syscall_errno (SYS_close, file, 0, 0, 0);
+  return syscall_errno (SYS_close, file, 0, 0, 0, 0, 0);
 }
 
 /* Establish a new name for an existing file.  */
 int
 _link(const char *old_name, const char *new_name)
 {
-  return syscall_errno (SYS_link, old_name, new_name, 0, 0);
+  return syscall_errno (SYS_link, old_name, new_name, 0, 0, 0, 0);
 }
 
 /* Remove a file's directory entry.  */
 int
 _unlink(const char *name)
 {
-  return syscall_errno (SYS_unlink, name, 0, 0, 0);
+  return syscall_errno (SYS_unlink, name, 0, 0, 0, 0, 0);
 }
 
 /* Transfer control to a new process. Minimal implementation for a
@@ -295,7 +296,7 @@ _isatty(int file)
 int
 _gettimeofday(struct timeval *tp, void *tz)
 {
-  return syscall_errno (SYS_gettimeofday, tp, 0, 0, 0);
+  return syscall_errno (SYS_gettimeofday, tp, 0, 0, 0, 0, 0);
 }
 
 /* Timing information for current process. From
@@ -396,13 +397,14 @@ _sbrk(ptrdiff_t incr)
 
   if (heap_end == 0)
     {
-      long brk = syscall_errno (SYS_brk, 0, 0, 0, 0);
+      long brk = syscall_errno (SYS_brk, 0, 0, 0, 0, 0, 0);
       if (brk == -1)
 	return (void *)-1;
       heap_end = brk;
     }
 
-  if (syscall_errno (SYS_brk, heap_end + incr, 0, 0, 0) != heap_end + incr)
+  if (syscall_errno (SYS_brk, heap_end + incr, 0, 0, 0, 0, 0)
+      != heap_end + incr)
     return (void *)-1;
 
   heap_end += incr;
@@ -414,6 +416,6 @@ _sbrk(ptrdiff_t incr)
 void
 _exit(int exit_status)
 {
-  syscall_errno (SYS_exit, exit_status, 0, 0, 0);
+  syscall_errno (SYS_exit, exit_status, 0, 0, 0, 0, 0);
   while (1);
 }