[patch] Patch adding propper PIC support to the rdrand code.

add-pic-to-rdrand.patch (text/plain), 1.25 KB, created by Francisco Blas Izquierdo Riera (RETIRED) on 2013-05-15 16:58:24 UTC

--- rdrand_asm.S.orig	2013-05-15 18:36:30.143681857 +0200
+++ rdrand_asm.S	2013-05-15 18:48:13.372698103 +0200
@@ -49,6 +49,7 @@
 	ret
 ENDPROC(x86_rdrand_nlong)
 
+#define INIT_PIC()
 #define SETPTR(var,ptr)	leaq var(%rip),ptr
 #define PTR0	%rdi
 #define PTR1	%rsi
@@ -84,7 +85,16 @@
 	ret
 ENDPROC(x86_rdrand_nlong)
 
+#if defined(__PIC__)
+#undef __i686 /* gcc builtin define gets in our way */
+#define INIT_PIC() \
+        call __i686.get_pc_thunk.bx ; \
+        addl $_GLOBAL_OFFSET_TABLE_, %ebx
+#define SETPTR(var,ptr)	leal (var)@GOTOFF(%ebx),ptr
+#else
+#define INIT_PIC()
 #define SETPTR(var,ptr)	movl $(var),ptr
+#endif
 #define PTR0	%eax
 #define PTR1	%edx
 #define PTR2	%ecx
@@ -101,6 +111,7 @@
 	movl	8(%ebp), %eax
 	movl	12(%ebp), %edx
 #endif
+        INIT_PIC()
 
 	SETPTR(aes_round_keys, PTR2)
 
@@ -166,6 +177,17 @@
 #endif
 	ret
 ENDPROC(x86_aes_mangle)
+
+#if defined(__i386__) && defined(__PIC__)
+        .section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits
+.globl __i686.get_pc_thunk.bx
+        .hidden  __i686.get_pc_thunk.bx
+        .type    __i686.get_pc_thunk.bx,@function
+__i686.get_pc_thunk.bx:
+        movl (%esp), %ebx
+        ret
+#endif
+
 	/*
 	 * AES round keys for an arbitrary key:
 	 * 00102030405060708090A0B0C0D0E0F0