diff options
author | Richard Henderson <richard.henderson@linaro.org> | 2018-06-26 09:19:10 -0700 |
---|---|---|
committer | David Gibson <david@gibson.dropbear.id.au> | 2018-07-03 09:56:52 +1000 |
commit | 94bf2658676be00b6f2b4db5d1788122217665b0 (patch) | |
tree | 6121b15476d188ea80373a0d32e57f939ba5af6a /target/ppc/mem_helper.c | |
parent | 0f3110fa67d3c3405202104f4833f1780e1a32bb (diff) |
target/ppc: Use atomic load for LQ and LQARX
Section 1.4 of the Power ISA v3.0B states that both of these
instructions are single-copy atomic. As we cannot (yet) issue
128-bit loads within TCG, use the generic helpers provided.
Since TCG cannot (yet) return a 128-bit value, add a slot within
CPUPPCState for returning the high half of a 128-bit return value.
This solution is preferred to the helper assigning to architectural
registers directly, as it avoids clobbering all TCG live values.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target/ppc/mem_helper.c')
-rw-r--r-- | target/ppc/mem_helper.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c index a34e604db3..44a8f3445a 100644 --- a/target/ppc/mem_helper.c +++ b/target/ppc/mem_helper.c @@ -21,9 +21,9 @@ #include "exec/exec-all.h" #include "qemu/host-utils.h" #include "exec/helper-proto.h" - #include "helper_regs.h" #include "exec/cpu_ldst.h" +#include "tcg.h" #include "internal.h" //#define DEBUG_OP @@ -215,6 +215,24 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg, return i; } +#if defined(TARGET_PPC64) && defined(CONFIG_ATOMIC128) +uint64_t helper_lq_le_parallel(CPUPPCState *env, target_ulong addr, + uint32_t opidx) +{ + Int128 ret = helper_atomic_ldo_le_mmu(env, addr, opidx, GETPC()); + env->retxh = int128_gethi(ret); + return int128_getlo(ret); +} + +uint64_t helper_lq_be_parallel(CPUPPCState *env, target_ulong addr, + uint32_t opidx) +{ + Int128 ret = helper_atomic_ldo_be_mmu(env, addr, opidx, GETPC()); + env->retxh = int128_gethi(ret); + return int128_getlo(ret); +} +#endif + /*****************************************************************************/ /* Altivec extension helpers */ #if defined(HOST_WORDS_BIGENDIAN) |