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.
2005-07-14 15:12:12 +00:00
parent 355d22ff06
commit 42ab148155
53 changed files with 1957 additions and 1503 deletions
--- a/kernel/system/do_sigreturn.c
+++ b/kernel/system/do_sigreturn.c
@@ -0,0 +1,79 @@
+/* The system call that is implemented in this file:
+ *     SYS_SIGCTL	# signal handling functionality 
+ *
+ * The parameters and types for this system call are:
+ *     SIG_REQUEST 	# request to perform			(long)
+ *     SIG_PROC  	# process to signal/ pending		(int)
+ *     SIG_CTXT_PTR 	# pointer to sigcontext structure	(pointer)	
+ *     SIG_FLAGS    	# flags for S_SIGRETURN call		(int)	
+ *     SIG_MAP		# bit map with pending signals		(long)	
+ *     SIG_NUMBER	# signal number to send to process	(int)	
+ *
+ * Supported request types are in the parameter SIG_REQUEST:
+ *     S_GETSIG		# get a pending kernel signal
+ *     S_ENDSIG		# signal has been processed 
+ *     S_SENDSIG	# deliver a POSIX-style signal 
+ *     S_SIGRETURN	# return from a POSIX-style signal 
+ *     S_KILL		# send a signal to a process 
+ */
+
+#include "../system.h"
+#include <signal.h>
+#include <sys/sigcontext.h>
+
+#if USE_SIGRETURN 
+
+/*===========================================================================*
+ *			      do_sigreturn				     *
+ *===========================================================================*/
+PUBLIC int do_sigreturn(m_ptr)
+message *m_ptr;			/* pointer to request message */
+{
+/* POSIX style signals require sys_sigreturn to put things in order before 
+ * the signalled process can resume execution
+ */
+  struct sigcontext sc;
+  register struct proc *rp;
+  phys_bytes src_phys;
+
+  rp = proc_addr(m_ptr->SIG_PROC);
+
+  /* Copy in the sigcontext structure. */
+  src_phys = umap_local(rp, D, (vir_bytes) m_ptr->SIG_CTXT_PTR,
+      (vir_bytes) sizeof(struct sigcontext));
+  if (src_phys == 0) return(EFAULT);
+  phys_copy(src_phys, vir2phys(&sc), (phys_bytes) sizeof(struct sigcontext));
+
+  /* Make sure that this is not just a jump buffer. */
+  if ((sc.sc_flags & SC_SIGCONTEXT) == 0) return(EINVAL);
+
+  /* Fix up only certain key registers if the compiler doesn't use
+   * register variables within functions containing setjmp.
+   */
+  if (sc.sc_flags & SC_NOREGLOCALS) {
+      rp->p_reg.retreg = sc.sc_retreg;
+      rp->p_reg.fp = sc.sc_fp;
+      rp->p_reg.pc = sc.sc_pc;
+      rp->p_reg.sp = sc.sc_sp;
+      return(OK);
+  }
+  sc.sc_psw  = rp->p_reg.psw;
+
+#if (CHIP == INTEL)
+  /* Don't panic kernel if user gave bad selectors. */
+  sc.sc_cs = rp->p_reg.cs;
+  sc.sc_ds = rp->p_reg.ds;
+  sc.sc_es = rp->p_reg.es;
+#if _WORD_SIZE == 4
+  sc.sc_fs = rp->p_reg.fs;
+  sc.sc_gs = rp->p_reg.gs;
+#endif
+#endif
+
+  /* Restore the registers. */
+  kmemcpy(&rp->p_reg, (char *)&sc.sc_regs, sizeof(struct sigregs));
+  return(OK);
+}
+#endif /* USE_SIGRETURN */
+
+