syscall_exec: use staticfast to shave 0.5K off execve()

diff --git a/Kernel/syscall_exec.c b/Kernel/syscall_exec.c
index b6e352a..0f0c7f7 100644 (file)
--- a/Kernel/syscall_exec.c
+++ b/Kernel/syscall_exec.c
@@ -4,6 +4,15 @@
 #include <printf.h>
 #include <timer.h>
 
+static void close_on_exec(void)
+{
+       int j;
+       for (j = UFTSIZE - 1; j >= 0; --j) {
+               if (udata.u_cloexec & (1 << j))
+                       doclose(j);
+       }
+       udata.u_cloexec = 0;
+}
 
 /* User's execve() call. All other flavors are library routines. */
 /*******************************************
@@ -18,27 +27,29 @@ char *envp[];
 
 int16_t _execve(void)
 {
-       inoptr ino, emu_ino;
-       unsigned char *buf;
-       blkno_t blk;
+       staticfast inoptr ino, emu_ino;
+       staticfast unsigned char *buf;
+       staticfast blkno_t blk;
        char **nargv;           /* In user space */
        char **nenvp;           /* In user space */
-       struct s_argblk *abuf, *ebuf;
+       staticfast struct s_argblk *abuf, *ebuf;
        int16_t (**sigp) ();
        int argc;
        uint16_t emu_size, emu_copy;
        uint8_t *progptr, *emu_ptr, *emu_base;
-       int j;
-       uint16_t top = (uint16_t)ramtop;
+       staticfast uint16_t top;
        uint8_t c;
        uint16_t blocks;
 
        kputs("execve\n");
 
+       top = (uint16_t)ramtop;
+
        if (!(ino = n_open(name, NULLINOPTR)))
                return (-1);
 
        kputs("Found it\n");
+
        if (!((getperm(ino) & OTH_EX) &&
              (ino->c_node.i_mode & F_REG) &&
              (ino->c_node.i_mode & (OWN_EX | OTH_EX | GRP_EX)))) {
@@ -134,11 +145,7 @@ int16_t _execve(void)
        /* At this point, we are committed to reading in and
         * executing the program. */
 
-       for (j = 0; j < UFTSIZE; ++j) {
-               if (udata.u_cloexec & (1 << j))
-                       doclose(j);
-       }
-       udata.u_cloexec = 0;
+       close_on_exec();
 
 #ifdef CONFIG_CPM_EMU
        // Load the CP/M emulator if it is required