Fix epiphany libgloss for c99/gcc-14

So in this case we mostly need to include an internal header
(epiphany-syscalls.h).  In a few cases an explicit prototype is added.  We've
also got a return with no value in a function with a non-void return type.
Finally the asm_syscall interface expects a pointer as its first argument.  In
a few cases we've actually got an int (file descriptor) which we just cast to a
void *.

It's slightly more than Jeff J's pre-approval, but I think still reasonable.

libgloss/epiphany/_isatty.c

@@ -18,6 +18,7 @@
 
 #include <sys/stat.h>
 #include <errno.h>
+#include "epiphany-syscalls.h"
 
 int
 _isatty (int fd)

libgloss/epiphany/epiphany-syscalls.c

@@ -253,7 +253,7 @@ int __attribute__ ((section ("libgloss_epiphany")))  e_raise(int signum) {
 		__asm__ __volatile__ ("wand");
 		//ilatst = 1 << WAND_IVT_N;
 		//break;
-		return;
+		return 0;
 
 	case SIG_USR1:
 		ilatst = 1 << USR_SOFT_IVT_N;

libgloss/epiphany/epiphany-syscalls.h

@@ -35,5 +35,7 @@ int asm_open(const char* FILE, int FLAGS, int MODE);
 void asm_exit(int STATUS);
 int asm_close(int CHAN);
 int asm_syscall(void *P1, void *P2, void *P3, int SUBFUN);
+int _fstat (int, struct stat *st);
+
 
 #endif

libgloss/epiphany/fstat.c

@@ -31,6 +31,7 @@
 
 #include <sys/stat.h>
 #include <syscall.h>
+#include "epiphany-syscalls.h"
 
 
 /* ------------------------------------------------------------------------- */
@@ -44,6 +45,6 @@
 int __attribute__ ((section ("libgloss_epiphany")))
 _fstat (int fildes, struct stat *st)
 {
-  return asm_syscall (fildes, st, NULL, SYS_fstat);
+  return asm_syscall ((void *)fildes, st, NULL, SYS_fstat);
 
 }	/* _fstat () */

libgloss/epiphany/gettimeofday.c

@@ -31,6 +31,7 @@
 #include <errno.h>
 #include <sys/time.h>
 #include "syscall.h"
+#include "epiphany-syscalls.h"
 
 int
 _gettimeofday (struct timeval *tp, void *tzp)

libgloss/epiphany/link.c

@@ -31,6 +31,7 @@
 
 #include <unistd.h>
 #include <syscall.h>
+#include "epiphany-syscalls.h"
 
 
 /* ------------------------------------------------------------------------- */

libgloss/epiphany/lseek.c

@@ -30,6 +30,7 @@
 
 #include <syscall.h>
 #include <sys/types.h>
+#include "epiphany-syscalls.h"
 
 /* ------------------------------------------------------------------------- */
 /*!Set a position in a file
@@ -43,5 +44,5 @@
 off_t __attribute__ ((section ("libgloss_epiphany")))
 _lseek (int  fildes, off_t offset, int  whence)
 {
-  return asm_syscall (fildes, offset, whence, SYS_lseek);
+  return asm_syscall ((void *)fildes, (void *)offset, (void *)whence, SYS_lseek);
 }	/* _lseek () */

libgloss/epiphany/stat.c

@@ -31,6 +31,7 @@
 
 #include <sys/stat.h>
 #include <syscall.h>
+#include "epiphany-syscalls.h"
 
 
 /* ------------------------------------------------------------------------- */

libgloss/epiphany/unlink.c

@@ -31,6 +31,7 @@
 
 #include <unistd.h>
 #include <syscall.h>
+#include "epiphany-syscalls.h"
 
 
 /* ------------------------------------------------------------------------- */