diff --git a/gdb/ppc64-tdep.c b/gdb/ppc64-tdep.c
index 5d8ccb48d4..4b8dd3fe3f 100644
--- a/gdb/ppc64-tdep.c
+++ b/gdb/ppc64-tdep.c
@@ -30,24 +30,24 @@
    you can use -1 to make masks.  */
 
 #define insn_d(opcd, rts, ra, d)                \
-  ((((opcd) & 0x3f) << 26)                      \
-   | (((rts) & 0x1f) << 21)                     \
-   | (((ra) & 0x1f) << 16)                      \
-   | ((d) & 0xffff))
+  ((((unsigned (opcd)) & 0x3f) << 26)		\
+   | (((unsigned (rts)) & 0x1f) << 21)		\
+   | (((unsigned (ra)) & 0x1f) << 16)		\
+   | ((unsigned (d)) & 0xffff))
 
 #define insn_ds(opcd, rts, ra, d, xo)           \
-  ((((opcd) & 0x3f) << 26)                      \
-   | (((rts) & 0x1f) << 21)                     \
-   | (((ra) & 0x1f) << 16)                      \
-   | ((d) & 0xfffc)                             \
-   | ((xo) & 0x3))
+  ((((unsigned (opcd)) & 0x3f) << 26)                      \
+   | (((unsigned (rts)) & 0x1f) << 21)                     \
+   | (((unsigned (ra)) & 0x1f) << 16)                      \
+   | ((unsigned (d)) & 0xfffc)                             \
+   | ((unsigned (xo)) & 0x3))
 
 #define insn_xfx(opcd, rts, spr, xo)            \
-  ((((opcd) & 0x3f) << 26)                      \
-   | (((rts) & 0x1f) << 21)                     \
-   | (((spr) & 0x1f) << 16)                     \
-   | (((spr) & 0x3e0) << 6)                     \
-   | (((xo) & 0x3ff) << 1))
+  ((((unsigned (opcd)) & 0x3f) << 26)                      \
+   | (((unsigned (rts)) & 0x1f) << 21)                     \
+   | (((unsigned (spr)) & 0x1f) << 16)                     \
+   | (((unsigned (spr)) & 0x3e0) << 6)                     \
+   | (((unsigned (xo)) & 0x3ff) << 1))
 
 /* PLT_OFF is the TOC-relative offset of a 64-bit PowerPC PLT entry.
    Return the function's entry point.  */
@@ -86,7 +86,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage1[] =
     { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
 
     /* std r2, 40(r1) */
-    { -1, insn_ds (62, 2, 1, 40, 0), 0 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 0 },
 
     /* ld r11, <any>(r12) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
@@ -107,7 +107,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage1[] =
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
 
     /* bctr */
-    { -1, 0x4e800420, 0 },
+    { (unsigned) -1, 0x4e800420, 0 },
 
     { 0, 0, 0 }
   };
@@ -122,13 +122,13 @@ static const struct ppc_insn_pattern ppc64_standard_linkage1[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage2[] =
   {
     /* std r2, 40(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 40, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 1 },
 
     /* addis r12, r2, <any> */
     { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
 
     /* std r2, 40(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 40, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 1 },
 
     /* ld r11, <any>(r12) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
@@ -140,10 +140,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage2[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
 
     /* xor r11, r11, r11 <optional> */
-    { -1, 0x7d6b5a78, 1 },
+    { (unsigned) -1, 0x7d6b5a78, 1 },
 
     /* add r12, r12, r11 <optional> */
-    { -1, 0x7d8c5a14, 1 },
+    { (unsigned) -1, 0x7d8c5a14, 1 },
 
     /* ld r2, <any>(r12) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
@@ -152,10 +152,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage2[] =
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
 
     /* bctr <optional> */
-    { -1, 0x4e800420, 1 },
+    { (unsigned) -1, 0x4e800420, 1 },
 
     /* cmpldi r2, 0 <optional> */
-    { -1, 0x28220000, 1 },
+    { (unsigned) -1, 0x28220000, 1 },
 
     { 0, 0, 0 }
   };
@@ -165,7 +165,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage2[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage3[] =
   {
     /* std r2, 40(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 40, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 1 },
 
     /* ld r11, <any>(r2) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
@@ -177,10 +177,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage3[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
 
     /* xor r11, r11, r11 <optional> */
-    { -1, 0x7d6b5a78, 1 },
+    { (unsigned) -1, 0x7d6b5a78, 1 },
 
     /* add r2, r2, r11 <optional> */
-    { -1, 0x7c425a14, 1 },
+    { (unsigned) -1, 0x7c425a14, 1 },
 
     /* ld r11, <any>(r2) <optional> */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 },
@@ -189,10 +189,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage3[] =
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
 
     /* bctr <optional> */
-    { -1, 0x4e800420, 1 },
+    { (unsigned) -1, 0x4e800420, 1 },
 
     /* cmpldi r2, 0 <optional> */
-    { -1, 0x28220000, 1 },
+    { (unsigned) -1, 0x28220000, 1 },
 
     { 0, 0, 0 }
   };
@@ -204,7 +204,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage3[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage4[] =
   {
     /* std r2, 40(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 40, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 1 },
 
     /* addis r11, r2, <any> */
     { insn_d (-1, -1, -1, 0), insn_d (15, 11, 2, 0), 0 },
@@ -219,10 +219,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage4[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 },
 
     /* xor r2, r12, r12 <optional> */
-    { -1, 0x7d826278, 1 },
+    { (unsigned) -1, 0x7d826278, 1 },
 
     /* add r11, r11, r2 <optional> */
-    { -1, 0x7d6b1214, 1 },
+    { (unsigned) -1, 0x7d6b1214, 1 },
 
     /* ld r2, <any>(r11) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 11, 0, 0), 0 },
@@ -231,10 +231,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage4[] =
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 11, 0, 0), 1 },
 
     /* bctr <optional> */
-    { -1, 0x4e800420, 1 },
+    { (unsigned) -1, 0x4e800420, 1 },
 
     /* cmpldi r2, 0 <optional> */
-    { -1, 0x28220000, 1 },
+    { (unsigned) -1, 0x28220000, 1 },
 
     { 0, 0, 0 }
   };
@@ -246,7 +246,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage4[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage5[] =
   {
     /* std r2, 40(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 40, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 40, 0), 1 },
 
     /* ld r12, <any>(r2) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 2, 0, 0), 0 },
@@ -258,10 +258,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage5[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 },
 
     /* xor r11, r12, r12 <optional> */
-    { -1, 0x7d8b6278, 1 },
+    { (unsigned) -1, 0x7d8b6278, 1 },
 
     /* add r2, r2, r11 <optional> */
-    { -1, 0x7c425a14, 1 },
+    { (unsigned) -1, 0x7c425a14, 1 },
 
     /* ld r11, <any>(r2) <optional> */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 },
@@ -270,10 +270,10 @@ static const struct ppc_insn_pattern ppc64_standard_linkage5[] =
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
 
     /* bctr <optional> */
-    { -1, 0x4e800420, 1 },
+    { (unsigned) -1, 0x4e800420, 1 },
 
     /* cmpldi r2, 0 <optional> */
-    { -1, 0x28220000, 1 },
+    { (unsigned) -1, 0x28220000, 1 },
 
     { 0, 0, 0 }
   };
@@ -283,7 +283,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage5[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage6[] =
   {
     /* std r2, 24(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 24, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 24, 0), 1 },
 
     /* addis r11, r2, <any> */
     { insn_d (-1, -1, -1, 0), insn_d (15, 11, 2, 0), 0 },
@@ -295,7 +295,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage6[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 },
 
     /* bctr */
-    { -1, 0x4e800420, 0 },
+    { (unsigned) -1, 0x4e800420, 0 },
 
     { 0, 0, 0 }
   };
@@ -305,7 +305,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage6[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage7[] =
   {
     /* std r2, 24(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 24, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 24, 0), 1 },
 
     /* ld r12, <any>(r2) */
     { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 2, 0, 0), 0 },
@@ -314,7 +314,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage7[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 },
 
     /* bctr */
-    { -1, 0x4e800420, 0 },
+    { (unsigned) -1, 0x4e800420, 0 },
 
     { 0, 0, 0 }
   };
@@ -325,7 +325,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage7[] =
 static const struct ppc_insn_pattern ppc64_standard_linkage8[] =
   {
     /* std r2, 24(r1) <optional> */
-    { -1, insn_ds (62, 2, 1, 24, 0), 1 },
+    { (unsigned) -1, insn_ds (62, 2, 1, 24, 0), 1 },
 
     /* addis r12, r2, <any> */
     { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
@@ -337,7 +337,7 @@ static const struct ppc_insn_pattern ppc64_standard_linkage8[] =
     { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 },
 
     /* bctr */
-    { -1, 0x4e800420, 0 },
+    { (unsigned) -1, 0x4e800420, 0 },
 
     { 0, 0, 0 }
   };
