[src/trunk]: src/sys/arch/amd64/amd64 Tidy up error handling, and return SIGB...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/59e16c950050
branches:  trunk
changeset: 806511:59e16c950050
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Feb 27 15:35:10 2015 +0000

description:
Tidy up error handling, and return SIGBUS for mmap past the end of file
as required by the spec.

diffstat:

 sys/arch/amd64/amd64/trap.c |  53 ++++++++++++++++++++++++++------------------
 1 files changed, 31 insertions(+), 22 deletions(-)

diffs (84 lines):

diff -r e9d02cc858f5 -r 59e16c950050 sys/arch/amd64/amd64/trap.c
--- a/sys/arch/amd64/amd64/trap.c       Fri Feb 27 15:21:54 2015 +0000
+++ b/sys/arch/amd64/amd64/trap.c       Fri Feb 27 15:35:10 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: trap.c,v 1.79 2014/10/18 08:33:24 snj Exp $    */
+/*     $NetBSD: trap.c,v 1.80 2015/02/27 15:35:10 christos Exp $       */
 
 /*-
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.79 2014/10/18 08:33:24 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.80 2015/02/27 15:35:10 christos Exp $");
 
 #include "opt_ddb.h"
 #include "opt_kgdb.h"
@@ -608,15 +608,6 @@
                        }
                        goto out;
                }
-               KSI_INIT_TRAP(&ksi);
-               ksi.ksi_trap = type & ~T_USER;
-               ksi.ksi_addr = (void *)cr2;
-               if (error == EACCES) {
-                       ksi.ksi_code = SEGV_ACCERR;
-                       error = EFAULT;
-               } else {
-                       ksi.ksi_code = SEGV_MAPERR;
-               }
 
                if (type == T_PAGEFLT) {
                        onfault = onfault_handler(pcb, frame);
@@ -626,20 +617,38 @@
                            map, va, ftype, error);
                        goto kernelfault;
                }
-               if (error == ENOMEM) {
+
+               KSI_INIT_TRAP(&ksi);
+               ksi.ksi_trap = type & ~T_USER;
+               ksi.ksi_addr = (void *)cr2;
+               switch (error) {
+               case EINVAL:
+                       ksi.ksi_signo = SIGBUS;
+                       ksi.ksi_code = BUS_ADRERR;
+                       break;
+               case EACCES:
+                       ksi.ksi_signo = SIGSEGV;
+                       ksi.ksi_code = SEGV_ACCERR;
+                       error = EFAULT;
+                       break;
+               case ENOMEM:
                        ksi.ksi_signo = SIGKILL;
-                       printf("UVM: pid %d.%d (%s), uid %d killed: out of swap\n",
-                              p->p_pid, l->l_lid, p->p_comm,
-                              l->l_cred ?
-                              kauth_cred_geteuid(l->l_cred) : -1);
-               } else {
+                       printf("UVM: pid %d.%d (%s), uid %d killed: "
+                           "out of swap\n", p->p_pid, l->l_lid, p->p_comm,
+                           l->l_cred ?  kauth_cred_geteuid(l->l_cred) : -1);
+                       break;
+               default:
+                       ksi.ksi_signo = SIGSEGV;
+                       ksi.ksi_code = SEGV_MAPERR;
+                       break;
+               }
+
 #ifdef TRAP_SIGDEBUG
-                       printf("pid %d.%d (%s): SEGV at rip %lx addr %lx\n",
-                           p->p_pid, l->l_lid, p->p_comm, frame->tf_rip, va);
-                       frame_dump(frame);
+               printf("pid %d.%d (%s): signal %d at rip %lx addr %lx "
+                   "error %d\n", p->p_pid, l->l_lid, p->p_comm, ksi.ksi_signo,
+                   frame->tf_rip, va, error);
+               frame_dump(frame);
 #endif
-                       ksi.ksi_signo = SIGSEGV;
-               }
                (*p->p_emul->e_trapsignal)(l, &ksi);
                break;
        }