[src/trunk]: src/sys/arch/amd64/amd64 CID-1364351: Fix uninitialized warnings.

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

details:   https://anonhg.NetBSD.org/src/rev/1852adb56024
branches:  trunk
changeset: 358893:1852adb56024
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 21 16:51:14 2018 +0000

description:
CID-1364351: Fix uninitialized warnings.

diffstat:

 sys/arch/amd64/amd64/db_disasm.c |  37 +++++++++++++++++++++++++------------
 1 files changed, 25 insertions(+), 12 deletions(-)

diffs (62 lines):

diff -r dae3164cd729 -r 1852adb56024 sys/arch/amd64/amd64/db_disasm.c
--- a/sys/arch/amd64/amd64/db_disasm.c  Sun Jan 21 16:38:25 2018 +0000
+++ b/sys/arch/amd64/amd64/db_disasm.c  Sun Jan 21 16:51:14 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: db_disasm.c,v 1.23 2016/03/25 10:14:43 shm Exp $       */
+/*     $NetBSD: db_disasm.c,v 1.24 2018/01/21 16:51:14 christos Exp $  */
 
 /* 
  * Mach Operating System
@@ -33,7 +33,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_disasm.c,v 1.23 2016/03/25 10:14:43 shm Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_disasm.c,v 1.24 2018/01/21 16:51:14 christos Exp $");
 
 #ifndef _KERNEL
 #include <sys/types.h>
@@ -1376,20 +1376,33 @@
 
                switch (i_mode & 0xFF) {
                case E:
-                       db_print_address(seg, rex, size, &address);
-                       break;
                case Eind:
-                       db_printf("*");
-                       db_print_address(seg, rex, size, &address);
-                       break;
                case Ed:
-                       db_print_address(seg, rex, LONG, &address);
-                       break;
                case Ew:
-                       db_print_address(seg, rex, WORD, &address);
-                       break;
                case Eb:
-                       db_print_address(seg, rex, BYTE, &address);
+                       if (!ip->i_has_modrm) {
+                               db_printf("Bad address mode %#x without modrm",
+                                   i_mode);
+                               break;
+                       }
+                       switch (i_mode & 0xFF) {
+                       case E:
+                               db_print_address(seg, rex, size, &address);
+                               break;
+                       case Eind:
+                               db_printf("*");
+                               db_print_address(seg, rex, size, &address);
+                               break;
+                       case Ed:
+                               db_print_address(seg, rex, LONG, &address);
+                               break;
+                       case Ew:
+                               db_print_address(seg, rex, WORD, &address);
+                               break;
+                       case Eb:
+                               db_print_address(seg, rex, BYTE, &address);
+                               break;
+                       }
                        break;
                case R: {
                        int ext = ((rex & REX_R) != 0);