syscall_exec16: fix crash with small binaries, reduce code footprint

diff --git a/Kernel/syscall_exec16.c b/Kernel/syscall_exec16.c
index 4f6b654..2f24477 100644 (file)
--- a/Kernel/syscall_exec16.c
+++ b/Kernel/syscall_exec16.c
@@ -155,13 +155,6 @@ arg_t _execve(void)
        /* We are definitely going to succeed with the exec,
         * so we can start writing over the old program
         */
-       uput(hdr, (uint8_t *)progload, 16);
-       udata.u_count = 512 - 16;
-       udata.u_base = (uint8_t *)(progload + 16);
-       udata.u_sysio = false;
-       readi(ino, 0);
-       if (udata.u_count != 512 - 16)
-               goto nogood4;
 
        /* At this point, we are committed to reading in and
         * executing the program. This call must not block. */
@@ -174,9 +167,9 @@ arg_t _execve(void)
         *  space and move it directly.
         */
 
-        progptr = progload + 512;
-        if (bin_size > 512) {
-               bin_size -= 512;
+        progptr = progload + 16;
+        if (bin_size > 16) {
+               bin_size -= 16;
                udata.u_base = (uint8_t *)progptr;              /* We copied the first block already */
                udata.u_count = bin_size;
                udata.u_sysio = false;