On 1/27/2014 12:59 PM, Alexander Graf wrote:
>
> On 27.01.2014, at 18:54, Tom Musta <tommu...@gmail.com> wrote:
>
>> This patch adds the Load Quadword and Reserve (lqarx) instruction,
>> which is new in Power ISA 2.07.
>>
>> Signed-off-by: Tom Musta <tommu...@gmail.com>
>> ---
>> target-ppc/translate.c | 34 ++++++++++++++++++++++++++++++++++
>> 1 files changed, 34 insertions(+), 0 deletions(-)
>>
>> diff --git a/target-ppc/translate.c b/target-ppc/translate.c
>> index bb1dc82..589cee9 100644
>> --- a/target-ppc/translate.c
>> +++ b/target-ppc/translate.c
>> @@ -3361,6 +3361,39 @@ STCX(stwcx_, 4);
>> /* ldarx */
>> LARX(ldarx, 8, ld64);
>>
>> +/* lqarx */
>> +static void gen_lqarx(DisasContext *ctx)
>> +{
>> + TCGv EA;
>> + int rd = rD(ctx->opcode);
>> + TCGv gpr1, gpr2;
>> +
>> + if (unlikely((rd & 1) || (rd == rA(ctx->opcode)) ||
>> + (rd == rB(ctx->opcode)))) {
>> + gen_inval_exception(ctx, POWERPC_EXCP_INVAL_INVAL);
>> + return;
>> + }
>> +
>> + gen_set_access_type(ctx, ACCESS_RES);
>> + EA = tcg_temp_local_new();
>> + gen_addr_reg_index(ctx, EA);
>> + gen_check_align(ctx, EA, 15);
>> + if (unlikely(ctx->le_mode)) {
>> + gpr1 = cpu_gpr[rd+1];
>> + gpr2 = cpu_gpr[rd];
>> + } else {
>> + gpr1 = cpu_gpr[rd];
>> + gpr2 = cpu_gpr[rd+1];
>> + }
>> + gen_qemu_ld64(ctx, gpr1, EA);
>> + tcg_gen_mov_tl(cpu_reserve, EA);
>> + tcg_gen_st_tl(gpr1, cpu_env, offsetof(CPUPPCState, reserve_val));
>
> I suppose it's ok to only store the first 64bits as reserved?
>
>
> Alex
>
Thank you, Alex. It looks like there is some interesting code in
linux-user/main.c that is impacted by lqarx/stqcx.
