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target-ppc: Add ISA 2.06 stbcx. and sthcx. Instructions 

This patch adds the byte and halfword variants of the Store Conditional
instructions.   A common macro is introduced and the existing implementations
of stwcx. and stdcx. are refactored to use this macro.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-01-07 10:05:57 -06:00 committed by Alexander Graf
parent 5c77a786e2
commit 587c51f74b
1 changed files with 45 additions and 48 deletions
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93
target-ppc/translate.c
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@ -3231,8 +3231,8 @@ LARX(lwarx, 4, ld32u);
#if defined(CONFIG_USER_ONLY)
static void gen_conditional_store (DisasContext *ctx, TCGv EA,
int reg, int size)
static void gen_conditional_store(DisasContext *ctx, TCGv EA,
int reg, int size)
{
TCGv t0 = tcg_temp_new();
uint32_t save_exception = ctx->exception;
@ -3246,62 +3246,57 @@ static void gen_conditional_store (DisasContext *ctx, TCGv EA,
gen_exception(ctx, POWERPC_EXCP_STCX);
ctx->exception = save_exception;
}
#endif
/* stwcx. */
static void gen_stwcx_(DisasContext *ctx)
{
TCGv t0;
gen_set_access_type(ctx, ACCESS_RES);
t0 = tcg_temp_local_new();
gen_addr_reg_index(ctx, t0);
gen_check_align(ctx, t0, 0x03);
#if defined(CONFIG_USER_ONLY)
gen_conditional_store(ctx, t0, rS(ctx->opcode), 4);
#else
{
int l1;
static void gen_conditional_store(DisasContext *ctx, TCGv EA,
int reg, int size)
{
int l1;
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st32(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
}
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, EA, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
#if defined(TARGET_PPC64)
if (size == 8) {
gen_qemu_st64(ctx, cpu_gpr[reg], EA);
} else
#endif
tcg_temp_free(t0);
if (size == 4) {
gen_qemu_st32(ctx, cpu_gpr[reg], EA);
} else if (size == 2) {
gen_qemu_st16(ctx, cpu_gpr[reg], EA);
} else {
gen_qemu_st8(ctx, cpu_gpr[reg], EA);
}
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
}
#endif
#define STCX(name, len) \
static void gen_##name(DisasContext *ctx) \
{ \
TCGv t0; \
gen_set_access_type(ctx, ACCESS_RES); \
t0 = tcg_temp_local_new(); \
gen_addr_reg_index(ctx, t0); \
if (len > 1) { \
gen_check_align(ctx, t0, (len)-1); \
} \
gen_conditional_store(ctx, t0, rS(ctx->opcode), len); \
tcg_temp_free(t0); \
}
STCX(stbcx_, 1);
STCX(sthcx_, 2);
STCX(stwcx_, 4);
#if defined(TARGET_PPC64)
/* ldarx */
LARX(ldarx, 8, ld64);
/* stdcx. */
static void gen_stdcx_(DisasContext *ctx)
{
TCGv t0;
gen_set_access_type(ctx, ACCESS_RES);
t0 = tcg_temp_local_new();
gen_addr_reg_index(ctx, t0);
gen_check_align(ctx, t0, 0x07);
#if defined(CONFIG_USER_ONLY)
gen_conditional_store(ctx, t0, rS(ctx->opcode), 8);
#else
{
int l1;
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st64(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
}
#endif
tcg_temp_free(t0);
}
STCX(stdcx_, 8);
#endif /* defined(TARGET_PPC64) */
/* sync */
@ -9512,6 +9507,8 @@ 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(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(ldarx, 0x1F, 0x14, 0x02, 0x00000000, PPC_64B),