Use raw opcodes for rdrand to build with older binutils

diff --git a/src/libstrongswan/plugins/rdrand/rdrand_rng.c b/src/libstrongswan/plugins/rdrand/rdrand_rng.c
index 8c219b42639f8a0fc3a58b52cb122e1d5bd040f0..d032cbe31d559e619d7b369695e65ba4344d7104 100644 (file)
--- a/src/libstrongswan/plugins/rdrand/rdrand_rng.c
+++ b/src/libstrongswan/plugins/rdrand/rdrand_rng.c
@@ -61,9 +61,9 @@ static bool rdrand16(u_int16_t *out)
 
        for (i = 0; i < MAX_TRIES; i++)
        {
-               asm("rdrand %0;"
+               asm(".byte 0x66;.byte 0x0f;.byte 0xc7;.byte 0xf0; " /* rdrand */
                        "setc %1;"
-                       : "=r"(*out), "=qm"(res));
+                       : "=a"(*out), "=qm"(res));
 
                if (res)
                {
@@ -83,9 +83,9 @@ static bool rdrand32(u_int32_t *out)
 
        for (i = 0; i < MAX_TRIES; i++)
        {
-               asm("rdrand %0;"
+               asm(".byte 0x0f;.byte 0xc7;.byte 0xf0;" /* rdrand */
                        "setc %1;"
-                       : "=r"(*out), "=qm"(res));
+                       : "=a"(*out), "=qm"(res));
 
                if (res)
                {
@@ -106,9 +106,9 @@ static bool rdrand64(u_int64_t *out)
 
        for (i = 0; i < MAX_TRIES; i++)
        {
-               asm("rdrand %0;"
+               asm(".byte 0x48;.byte 0x0f;.byte 0xc7;.byte 0xf0;" /* rdrand */
                        "setc %1;"
-                       : "=r"(*out), "=qm"(res));
+                       : "=a"(*out), "=qm"(res));
 
                if (res)
                {