* Thomas Garnier <thgarnie@xxxxxxxxxx> wrote: > Change the assembly code to use only relative references of symbols for the > kernel to be PIE compatible. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit. > diff --git a/arch/x86/crypto/aes-x86_64-asm_64.S b/arch/x86/crypto/aes-x86_64-asm_64.S > index 8739cf7795de..86fa068e5e81 100644 > --- a/arch/x86/crypto/aes-x86_64-asm_64.S > +++ b/arch/x86/crypto/aes-x86_64-asm_64.S > @@ -48,8 +48,12 @@ > #define R10 %r10 > #define R11 %r11 > > +/* Hold global for PIE suport */ > +#define RBASE %r12 > + > #define prologue(FUNC,KEY,B128,B192,r1,r2,r5,r6,r7,r8,r9,r10,r11) \ > ENTRY(FUNC); \ > + pushq RBASE; \ > movq r1,r2; \ > leaq KEY+48(r8),r9; \ > movq r10,r11; \ > @@ -74,54 +78,63 @@ > movl r6 ## E,4(r9); \ > movl r7 ## E,8(r9); \ > movl r8 ## E,12(r9); \ > + popq RBASE; \ > ret; \ > ENDPROC(FUNC); > > +#define round_mov(tab_off, reg_i, reg_o) \ > + leaq tab_off(%rip), RBASE; \ > + movl (RBASE,reg_i,4), reg_o; > + > +#define round_xor(tab_off, reg_i, reg_o) \ > + leaq tab_off(%rip), RBASE; \ > + xorl (RBASE,reg_i,4), reg_o; > + > #define round(TAB,OFFSET,r1,r2,r3,r4,r5,r6,r7,r8,ra,rb,rc,rd) \ > movzbl r2 ## H,r5 ## E; \ > movzbl r2 ## L,r6 ## E; \ > - movl TAB+1024(,r5,4),r5 ## E;\ > + round_mov(TAB+1024, r5, r5 ## E)\ > movw r4 ## X,r2 ## X; \ > - movl TAB(,r6,4),r6 ## E; \ > + round_mov(TAB, r6, r6 ## E) \ > roll $16,r2 ## E; \ > shrl $16,r4 ## E; \ > movzbl r4 ## L,r7 ## E; \ > movzbl r4 ## H,r4 ## E; \ > xorl OFFSET(r8),ra ## E; \ > xorl OFFSET+4(r8),rb ## E; \ > - xorl TAB+3072(,r4,4),r5 ## E;\ > - xorl TAB+2048(,r7,4),r6 ## E;\ > + round_xor(TAB+3072, r4, r5 ## E)\ > + round_xor(TAB+2048, r7, r6 ## E)\ > movzbl r1 ## L,r7 ## E; \ > movzbl r1 ## H,r4 ## E; \ > - movl TAB+1024(,r4,4),r4 ## E;\ > + round_mov(TAB+1024, r4, r4 ## E)\ > movw r3 ## X,r1 ## X; \ > roll $16,r1 ## E; \ > shrl $16,r3 ## E; \ > - xorl TAB(,r7,4),r5 ## E; \ > + round_xor(TAB, r7, r5 ## E) \ > movzbl r3 ## L,r7 ## E; \ > movzbl r3 ## H,r3 ## E; \ > - xorl TAB+3072(,r3,4),r4 ## E;\ > - xorl TAB+2048(,r7,4),r5 ## E;\ > + round_xor(TAB+3072, r3, r4 ## E)\ > + round_xor(TAB+2048, r7, r5 ## E)\ > movzbl r1 ## L,r7 ## E; \ > movzbl r1 ## H,r3 ## E; \ > shrl $16,r1 ## E; \ > - xorl TAB+3072(,r3,4),r6 ## E;\ > - movl TAB+2048(,r7,4),r3 ## E;\ > + round_xor(TAB+3072, r3, r6 ## E)\ > + round_mov(TAB+2048, r7, r3 ## E)\ > movzbl r1 ## L,r7 ## E; \ > movzbl r1 ## H,r1 ## E; \ > - xorl TAB+1024(,r1,4),r6 ## E;\ > - xorl TAB(,r7,4),r3 ## E; \ > + round_xor(TAB+1024, r1, r6 ## E)\ > + round_xor(TAB, r7, r3 ## E) \ > movzbl r2 ## H,r1 ## E; \ > movzbl r2 ## L,r7 ## E; \ > shrl $16,r2 ## E; \ > - xorl TAB+3072(,r1,4),r3 ## E;\ > - xorl TAB+2048(,r7,4),r4 ## E;\ > + round_xor(TAB+3072, r1, r3 ## E)\ > + round_xor(TAB+2048, r7, r4 ## E)\ > movzbl r2 ## H,r1 ## E; \ > movzbl r2 ## L,r2 ## E; \ > xorl OFFSET+8(r8),rc ## E; \ > xorl OFFSET+12(r8),rd ## E; \ > - xorl TAB+1024(,r1,4),r3 ## E;\ > - xorl TAB(,r2,4),r4 ## E; > + round_xor(TAB+1024, r1, r3 ## E)\ > + round_xor(TAB, r2, r4 ## E) This appears to be adding unconditional overhead to a function that was moved to assembly to improve its performance. Thanks, Ingo _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
