Reorganized system call library; uses separate file per call now.

New configuration header file to include/ exclude functionality.
Extracted privileged features from struct proc and create new struct priv.
Renamed various system calls for readability.

kernel/system/do_exec.c

@@ -0,0 +1,63 @@
+/* The system call implemented in this file:
+ *   m_type:	SYS_EXEC
+ *
+ * The parameters for this system call are:
+ *    m1_i1:	PR_PROC_NR		(process that did exec call)
+ *    m1_i3:	PR_TRACING		(flag to indicate tracing is on/ off)
+ *    m1_p1:	PR_STACK_PTR		(new stack pointer)
+ *    m1_p2:	PR_NAME_PTR		(pointer to program name)
+ *    m1_p3:	PR_IP_PTR		(new instruction pointer)
+ */
+#include "../system.h"
+#include <signal.h>
+
+#if USE_EXEC
+
+/*===========================================================================*
+ *				do_exec					     *
+ *===========================================================================*/
+PUBLIC int do_exec(m_ptr)
+register message *m_ptr;	/* pointer to request message */
+{
+/* Handle sys_exec().  A process has done a successful EXEC. Patch it up. */
+
+  register struct proc *rp;
+  reg_t sp;			/* new sp */
+  phys_bytes phys_name;
+  char *np;
+
+  rp = proc_addr(m_ptr->PR_PROC_NR);
+  if (m_ptr->PR_TRACING) cause_sig(m_ptr->PR_PROC_NR, SIGTRAP);
+  sp = (reg_t) m_ptr->PR_STACK_PTR;
+  rp->p_reg.sp = sp;		/* set the stack pointer */
+#if (CHIP == M68000)
+  rp->p_splow = sp;		/* set the stack pointer low water */
+#ifdef FPP
+  /* Initialize fpp for this process */
+  fpp_new_state(rp);
+#endif
+#endif
+#if (CHIP == INTEL)		/* wipe extra LDT entries */
+  kmemset(&rp->p_ldt[EXTRA_LDT_INDEX], 0,
+	(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_ldt[0]));
+#endif
+  rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR;	/* set pc */
+  rp->p_rts_flags &= ~RECEIVING;	/* PM does not reply to EXEC call */
+  if (rp->p_rts_flags == 0) lock_ready(rp);
+
+  /* Save command name for debugging, ps(1) output, etc. */
+  phys_name = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->PR_NAME_PTR,
+					(vir_bytes) P_NAME_LEN - 1);
+  if (phys_name != 0) {
+	phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
+	for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
+	*np = 0;					/* mark end */
+  } else {
+  	kstrncpy(rp->p_name, "<unset>", P_NAME_LEN);
+  }
+  return(OK);
+}
+#endif /* USE_EXEC */
+
+
+