diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/lib/copyuser_64.S | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/powerpc/lib/copyuser_64.S b/arch/powerpc/lib/copyuser_64.S index 25ec5378afa..70693a5c12a 100644 --- a/arch/powerpc/lib/copyuser_64.S +++ b/arch/powerpc/lib/copyuser_64.S @@ -26,11 +26,24 @@ _GLOBAL(__copy_tofrom_user) andi. r6,r6,7 PPC_MTOCRF 0x01,r5 blt cr1,.Lshort_copy +/* Below we want to nop out the bne if we're on a CPU that has the + * CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit + * cleared. + * At the time of writing the only CPU that has this combination of bits + * set is Power6. + */ +BEGIN_FTR_SECTION + nop +FTR_SECTION_ELSE bne .Ldst_unaligned +ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \ + CPU_FTR_UNALIGNED_LD_STD) .Ldst_aligned: - andi. r0,r4,7 addi r3,r3,-16 +BEGIN_FTR_SECTION + andi. r0,r4,7 bne .Lsrc_unaligned +END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD) srdi r7,r5,4 20: ld r9,0(r4) addi r4,r4,-8 @@ -138,7 +151,7 @@ _GLOBAL(__copy_tofrom_user) PPC_MTOCRF 0x01,r6 /* put #bytes to 8B bdry into cr7 */ subf r5,r6,r5 li r7,0 - cmpldi r1,r5,16 + cmpldi cr1,r5,16 bf cr7*4+3,1f 35: lbz r0,0(r4) 81: stb r0,0(r3) |