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target-ppc: implement load atomic instruction
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lwat: Load Word Atomic
ldat: Load Doubleword Atomic

The instruction includes as function code (5 bits) which gives a detail
on the operation to be performed. The patch implements five such
functions.

Signed-off-by: Balamuruhan S <bala24@linux.vnet.ibm.com>
Signed-off-by: Harish S <harisrir@linux.vnet.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
[ combine both lwat/ldat implementation using macro ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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@dgibson
Balamuruhan S authored and dgibson committed Feb 22, 2017
1 parent fe93e3e commit a68a614
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2 changes: 2 additions & 0 deletions target/ppc/internal.h
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Expand Up @@ -133,6 +133,8 @@ EXTRACT_HELPER(UIMM4, 16, 4);
EXTRACT_HELPER(NB, 11, 5);
/* Shift count */
EXTRACT_HELPER(SH, 11, 5);
/* lwat/stwat/ldat/lwat */
EXTRACT_HELPER(FC, 11, 5);
/* Vector shift count */
EXTRACT_HELPER(VSH, 6, 4);
/* Mask start */
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59 changes: 59 additions & 0 deletions target/ppc/translate.c
View file
Expand Up @@ -2976,6 +2976,63 @@ LARX(lbarx, DEF_MEMOP(MO_UB))
LARX(lharx, DEF_MEMOP(MO_UW))
LARX(lwarx, DEF_MEMOP(MO_UL))

#define LD_ATOMIC(name, memop, tp, op, eop) \
static void gen_##name(DisasContext *ctx) \
{ \
int len = MEMOP_GET_SIZE(memop); \
uint32_t gpr_FC = FC(ctx->opcode); \
TCGv EA = tcg_temp_local_new(); \
TCGv_##tp t0, t1; \
\
gen_addr_register(ctx, EA); \
if (len > 1) { \
gen_check_align(ctx, EA, len - 1); \
} \
t0 = tcg_temp_new_##tp(); \
t1 = tcg_temp_new_##tp(); \
tcg_gen_##op(t0, cpu_gpr[rD(ctx->opcode) + 1]); \
\
switch (gpr_FC) { \
case 0: /* Fetch and add */ \
tcg_gen_atomic_fetch_add_##tp(t1, EA, t0, ctx->mem_idx, memop); \
break; \
case 1: /* Fetch and xor */ \
tcg_gen_atomic_fetch_xor_##tp(t1, EA, t0, ctx->mem_idx, memop); \
break; \
case 2: /* Fetch and or */ \
tcg_gen_atomic_fetch_or_##tp(t1, EA, t0, ctx->mem_idx, memop); \
break; \
case 3: /* Fetch and 'and' */ \
tcg_gen_atomic_fetch_and_##tp(t1, EA, t0, ctx->mem_idx, memop); \
break; \
case 8: /* Swap */ \
tcg_gen_atomic_xchg_##tp(t1, EA, t0, ctx->mem_idx, memop); \
break; \
case 4: /* Fetch and max unsigned */ \
case 5: /* Fetch and max signed */ \
case 6: /* Fetch and min unsigned */ \
case 7: /* Fetch and min signed */ \
case 16: /* compare and swap not equal */ \
case 24: /* Fetch and increment bounded */ \
case 25: /* Fetch and increment equal */ \
case 28: /* Fetch and decrement bounded */ \
gen_invalid(ctx); \
break; \
default: \
/* invoke data storage error handler */ \
gen_exception_err(ctx, POWERPC_EXCP_DSI, POWERPC_EXCP_INVAL); \
} \
tcg_gen_##eop(cpu_gpr[rD(ctx->opcode)], t1); \
tcg_temp_free_##tp(t0); \
tcg_temp_free_##tp(t1); \
tcg_temp_free(EA); \
}

LD_ATOMIC(lwat, DEF_MEMOP(MO_UL), i32, trunc_tl_i32, extu_i32_tl)
#if defined(TARGET_PPC64)
LD_ATOMIC(ldat, DEF_MEMOP(MO_Q), i64, mov_i64, mov_i64)
#endif

#if defined(CONFIG_USER_ONLY)
static void gen_conditional_store(DisasContext *ctx, TCGv EA,
int reg, int memop)
Expand Down Expand Up @@ -6230,10 +6287,12 @@ GEN_HANDLER(isync, 0x13, 0x16, 0x04, 0x03FFF801, PPC_MEM),
GEN_HANDLER_E(lbarx, 0x1F, 0x14, 0x01, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
GEN_HANDLER_E(lharx, 0x1F, 0x14, 0x03, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
GEN_HANDLER(lwarx, 0x1F, 0x14, 0x00, 0x00000000, PPC_RES),
GEN_HANDLER_E(lwat, 0x1F, 0x06, 0x12, 0x00000001, PPC_NONE, PPC2_ISA300),
GEN_HANDLER_E(stbcx_, 0x1F, 0x16, 0x15, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
GEN_HANDLER_E(sthcx_, 0x1F, 0x16, 0x16, 0, PPC_NONE, PPC2_ATOMIC_ISA206),
GEN_HANDLER2(stwcx_, "stwcx.", 0x1F, 0x16, 0x04, 0x00000000, PPC_RES),
#if defined(TARGET_PPC64)
GEN_HANDLER_E(ldat, 0x1F, 0x06, 0x13, 0x00000001, PPC_NONE, PPC2_ISA300),
GEN_HANDLER(ldarx, 0x1F, 0x14, 0x02, 0x00000000, PPC_64B),
GEN_HANDLER_E(lqarx, 0x1F, 0x14, 0x08, 0, PPC_NONE, PPC2_LSQ_ISA207),
GEN_HANDLER2(stdcx_, "stdcx.", 0x1F, 0x16, 0x06, 0x00000000, PPC_64B),
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