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Re: [Qemu-devel] [PATCH] target-microblaze: Use the new qemu_ld/st opcod
From: |
Edgar E. Iglesias |
Subject: |
Re: [Qemu-devel] [PATCH] target-microblaze: Use the new qemu_ld/st opcodes |
Date: |
Fri, 13 Dec 2013 11:04:17 +1000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Dec 10, 2013 at 03:40:21PM -0800, Richard Henderson wrote:
> The ability of the new opcodes to byte-swap the memory operation
> simplifies the code in and around dec_load and dec_store significantly.
I've tested and applied this, thanks.
Edgar
>
> Cc: Edgar E. Iglesias <address@hidden>
> Signed-off-by: Richard Henderson <address@hidden>
> ---
> target-microblaze/translate.c | 139
> +++++++++++-------------------------------
> 1 file changed, 35 insertions(+), 104 deletions(-)
>
> diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
> index 9edcb67..270138c 100644
> --- a/target-microblaze/translate.c
> +++ b/target-microblaze/translate.c
> @@ -864,26 +864,6 @@ static void dec_imm(DisasContext *dc)
> dc->clear_imm = 0;
> }
>
> -static inline void gen_load(DisasContext *dc, TCGv dst, TCGv addr,
> - unsigned int size, bool exclusive)
> -{
> - int mem_index = cpu_mmu_index(dc->env);
> -
> - if (size == 1) {
> - tcg_gen_qemu_ld8u(dst, addr, mem_index);
> - } else if (size == 2) {
> - tcg_gen_qemu_ld16u(dst, addr, mem_index);
> - } else if (size == 4) {
> - tcg_gen_qemu_ld32u(dst, addr, mem_index);
> - } else
> - cpu_abort(dc->env, "Incorrect load size %d\n", size);
> -
> - if (exclusive) {
> - tcg_gen_mov_tl(env_res_addr, addr);
> - tcg_gen_mov_tl(env_res_val, dst);
> - }
> -}
> -
> static inline TCGv *compute_ldst_addr(DisasContext *dc, TCGv *t)
> {
> unsigned int extimm = dc->tb_flags & IMM_FLAG;
> @@ -935,35 +915,22 @@ static inline TCGv *compute_ldst_addr(DisasContext *dc,
> TCGv *t)
> return t;
> }
>
> -static inline void dec_byteswap(DisasContext *dc, TCGv dst, TCGv src, int
> size)
> -{
> - if (size == 4) {
> - tcg_gen_bswap32_tl(dst, src);
> - } else if (size == 2) {
> - TCGv t = tcg_temp_new();
> -
> - /* bswap16 assumes the high bits are zero. */
> - tcg_gen_andi_tl(t, src, 0xffff);
> - tcg_gen_bswap16_tl(dst, t);
> - tcg_temp_free(t);
> - } else {
> - /* Ignore.
> - cpu_abort(dc->env, "Invalid ldst byteswap size %d\n", size);
> - */
> - }
> -}
> -
> static void dec_load(DisasContext *dc)
> {
> - TCGv t, *addr;
> + TCGv t, v, *addr;
> unsigned int size, rev = 0, ex = 0;
> + TCGMemOp mop;
>
> - size = 1 << (dc->opcode & 3);
> -
> + mop = dc->opcode & 3;
> + size = 1 << mop;
> if (!dc->type_b) {
> rev = (dc->ir >> 9) & 1;
> ex = (dc->ir >> 10) & 1;
> }
> + mop |= MO_TE;
> + if (rev) {
> + mop ^= MO_BSWAP;
> + }
>
> if (size > 4 && (dc->tb_flags & MSR_EE_FLAG)
> && (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)) {
> @@ -1044,40 +1011,30 @@ static void dec_load(DisasContext *dc)
> sync_jmpstate(dc);
>
> /* Verify alignment if needed. */
> - if ((dc->env->pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
> - TCGv v = tcg_temp_new();
> -
> - /*
> - * Microblaze gives MMU faults priority over faults due to
> - * unaligned addresses. That's why we speculatively do the load
> - * into v. If the load succeeds, we verify alignment of the
> - * address and if that succeeds we write into the destination reg.
> - */
> - gen_load(dc, v, *addr, size, ex);
> + /*
> + * Microblaze gives MMU faults priority over faults due to
> + * unaligned addresses. That's why we speculatively do the load
> + * into v. If the load succeeds, we verify alignment of the
> + * address and if that succeeds we write into the destination reg.
> + */
> + v = tcg_temp_new();
> + tcg_gen_qemu_ld_tl(v, *addr, cpu_mmu_index(dc->env), mop);
>
> + if ((dc->env->pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
> tcg_gen_movi_tl(cpu_SR[SR_PC], dc->pc);
> gen_helper_memalign(cpu_env, *addr, tcg_const_tl(dc->rd),
> tcg_const_tl(0), tcg_const_tl(size - 1));
> - if (dc->rd) {
> - if (rev) {
> - dec_byteswap(dc, cpu_R[dc->rd], v, size);
> - } else {
> - tcg_gen_mov_tl(cpu_R[dc->rd], v);
> - }
> - }
> - tcg_temp_free(v);
> - } else {
> - if (dc->rd) {
> - gen_load(dc, cpu_R[dc->rd], *addr, size, ex);
> - if (rev) {
> - dec_byteswap(dc, cpu_R[dc->rd], cpu_R[dc->rd], size);
> - }
> - } else {
> - /* We are loading into r0, no need to reverse. */
> - gen_load(dc, env_imm, *addr, size, ex);
> - }
> }
>
> + if (ex) {
> + tcg_gen_mov_tl(env_res_addr, *addr);
> + tcg_gen_mov_tl(env_res_val, v);
> + }
> + if (dc->rd) {
> + tcg_gen_mov_tl(cpu_R[dc->rd], v);
> + }
> + tcg_temp_free(v);
> +
> if (ex) { /* lwx */
> /* no support for for AXI exclusive so always clear C */
> write_carryi(dc, 0);
> @@ -1087,32 +1044,23 @@ static void dec_load(DisasContext *dc)
> tcg_temp_free(t);
> }
>
> -static void gen_store(DisasContext *dc, TCGv addr, TCGv val,
> - unsigned int size)
> -{
> - int mem_index = cpu_mmu_index(dc->env);
> -
> - if (size == 1)
> - tcg_gen_qemu_st8(val, addr, mem_index);
> - else if (size == 2) {
> - tcg_gen_qemu_st16(val, addr, mem_index);
> - } else if (size == 4) {
> - tcg_gen_qemu_st32(val, addr, mem_index);
> - } else
> - cpu_abort(dc->env, "Incorrect store size %d\n", size);
> -}
> -
> static void dec_store(DisasContext *dc)
> {
> TCGv t, *addr, swx_addr;
> int swx_skip = 0;
> unsigned int size, rev = 0, ex = 0;
> + TCGMemOp mop;
>
> - size = 1 << (dc->opcode & 3);
> + mop = dc->opcode & 3;
> + size = 1 << mop;
> if (!dc->type_b) {
> rev = (dc->ir >> 9) & 1;
> ex = (dc->ir >> 10) & 1;
> }
> + mop |= MO_TE;
> + if (rev) {
> + mop ^= MO_BSWAP;
> + }
>
> if (size > 4 && (dc->tb_flags & MSR_EE_FLAG)
> && (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)) {
> @@ -1148,7 +1096,7 @@ static void dec_store(DisasContext *dc)
> this compare and the following write to be atomic. For user
> emulation we need to add atomicity between threads. */
> tval = tcg_temp_new();
> - gen_load(dc, tval, swx_addr, 4, false);
> + tcg_gen_qemu_ld_tl(tval, swx_addr, cpu_mmu_index(dc->env), MO_TEUL);
> tcg_gen_brcond_tl(TCG_COND_NE, env_res_val, tval, swx_skip);
> write_carryi(dc, 0);
> tcg_temp_free(tval);
> @@ -1197,25 +1145,8 @@ static void dec_store(DisasContext *dc)
> cpu_abort(dc->env, "Invalid reverse size\n");
> break;
> }
> -
> - if (size != 1) {
> - TCGv bs_data = tcg_temp_new();
> - dec_byteswap(dc, bs_data, cpu_R[dc->rd], size);
> - gen_store(dc, *addr, bs_data, size);
> - tcg_temp_free(bs_data);
> - } else {
> - gen_store(dc, *addr, cpu_R[dc->rd], size);
> - }
> - } else {
> - if (rev) {
> - TCGv bs_data = tcg_temp_new();
> - dec_byteswap(dc, bs_data, cpu_R[dc->rd], size);
> - gen_store(dc, *addr, bs_data, size);
> - tcg_temp_free(bs_data);
> - } else {
> - gen_store(dc, *addr, cpu_R[dc->rd], size);
> - }
> }
> + tcg_gen_qemu_st_tl(cpu_R[dc->rd], *addr, cpu_mmu_index(dc->env), mop);
>
> /* Verify alignment if needed. */
> if ((dc->env->pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
> --
> 1.8.1.4
>