diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2018-06-26 09:19:21 -0700 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2018-07-03 09:56:52 +1000 |
| commit | 7fbc2b20d2e0ca1898bfc2bd871fb674ec1039fb (patch) | |
| tree | aaf111fd0c30309a4cfa2769d973ea0202214df1 /target | |
| parent | 20923c1d02b68dfd848f014a77747c0e4817682a (diff) | |
target/ppc: Implement the rest of gen_st_atomic
The store twin case was stubbed out. For now, implement it only within
a serial context, forcing parallel execution to synchronize. It would
be possible to implement with a cmpxchg loop, if we care, but the loose
alignment requirements (simply no crossing 32-byte boundary) might send
us back to the serial context anyway.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target')
| -rw-r--r-- | target/ppc/translate.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 597a37d3ec..e120f2ed0b 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -3254,7 +3254,31 @@ static void gen_st_atomic(DisasContext *ctx, TCGMemOp memop) tcg_gen_atomic_smin_fetch_tl(discard, EA, src, ctx->mem_idx, memop); break; case 24: /* Store twin */ - gen_invalid(ctx); + if (tb_cflags(ctx->base.tb) & CF_PARALLEL) { + /* Restart with exclusive lock. */ + gen_helper_exit_atomic(cpu_env); + ctx->base.is_jmp = DISAS_NORETURN; + } else { + TCGv t = tcg_temp_new(); + TCGv t2 = tcg_temp_new(); + TCGv s = tcg_temp_new(); + TCGv s2 = tcg_temp_new(); + TCGv ea_plus_s = tcg_temp_new(); + + tcg_gen_qemu_ld_tl(t, EA, ctx->mem_idx, memop); + tcg_gen_addi_tl(ea_plus_s, EA, MEMOP_GET_SIZE(memop)); + tcg_gen_qemu_ld_tl(t2, ea_plus_s, ctx->mem_idx, memop); + tcg_gen_movcond_tl(TCG_COND_EQ, s, t, t2, src, t); + tcg_gen_movcond_tl(TCG_COND_EQ, s2, t, t2, src, t2); + tcg_gen_qemu_st_tl(s, EA, ctx->mem_idx, memop); + tcg_gen_qemu_st_tl(s2, ea_plus_s, ctx->mem_idx, memop); + + tcg_temp_free(ea_plus_s); + tcg_temp_free(s2); + tcg_temp_free(s); + tcg_temp_free(t2); + tcg_temp_free(t); + } break; default: /* invoke data storage error handler */ |