From 18f440edfb974feaff8490d4861844b5a2b7a3b5 Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Thu, 15 Feb 2018 20:52:07 -0500 Subject: target/mips: convert to TranslatorOps Notes: - DISAS_TOO_MANY replaces the former "break" in the translation loop. However, care must be taken not to overwrite a previous condition in is_jmp; that's why in translate_insn we first check is_jmp and return if it's != DISAS_NEXT. - Added an assert in translate_insn, before exiting due to an exception, to make sure that is_jmp is set to DISAS_NORETURN (the exception generation function always sets it.) - Added an assert for the default case in is_jmp's switch. Reviewed-by: Richard Henderson Cc: Aurelien Jarno Cc: Yongbok Kim Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/mips/translate.c | 227 ++++++++++++++++++++++++------------------------ 1 file changed, 113 insertions(+), 114 deletions(-) diff --git a/target/mips/translate.c b/target/mips/translate.c index 7a931ea3e7..9eff842c39 100644 --- a/target/mips/translate.c +++ b/target/mips/translate.c @@ -1432,6 +1432,7 @@ static TCGv_i64 msa_wr_d[64]; typedef struct DisasContext { DisasContextBase base; target_ulong saved_pc; + target_ulong page_start; uint32_t opcode; int insn_flags; int32_t CP0_Config1; @@ -20194,24 +20195,12 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx) } } -void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) +static void mips_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs) { + DisasContext *ctx = container_of(dcbase, DisasContext, base); CPUMIPSState *env = cs->env_ptr; - DisasContext ctx1; - DisasContext *ctx = &ctx1; - target_ulong page_start; - int max_insns; - int insn_bytes; - int is_slot; - - ctx->base.tb = tb; - ctx->base.pc_first = tb->pc; - ctx->base.pc_next = tb->pc; - ctx->base.is_jmp = DISAS_NEXT; - ctx->base.singlestep_enabled = cs->singlestep_enabled; - ctx->base.num_insns = 0; - page_start = ctx->base.pc_first & TARGET_PAGE_MASK; + ctx->page_start = ctx->base.pc_first & TARGET_PAGE_MASK; ctx->saved_pc = -1; ctx->insn_flags = env->insn_flags; ctx->CP0_Config1 = env->CP0_Config1; @@ -20244,99 +20233,102 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) #endif ctx->default_tcg_memop_mask = (ctx->insn_flags & ISA_MIPS32R6) ? MO_UNALN : MO_ALIGN; - max_insns = tb_cflags(tb) & CF_COUNT_MASK; - if (max_insns == 0) { - max_insns = CF_COUNT_MASK; - } - if (max_insns > TCG_MAX_INSNS) { - max_insns = TCG_MAX_INSNS; - } - LOG_DISAS("\ntb %p idx %d hflags %04x\n", tb, ctx->mem_idx, ctx->hflags); - gen_tb_start(tb); - while (ctx->base.is_jmp == DISAS_NEXT) { - tcg_gen_insn_start(ctx->base.pc_next, ctx->hflags & MIPS_HFLAG_BMASK, - ctx->btarget); - ctx->base.num_insns++; + LOG_DISAS("\ntb %p idx %d hflags %04x\n", ctx->base.tb, ctx->mem_idx, + ctx->hflags); +} - if (unlikely(cpu_breakpoint_test(cs, ctx->base.pc_next, BP_ANY))) { - save_cpu_state(ctx, 1); - ctx->base.is_jmp = DISAS_NORETURN; - gen_helper_raise_exception_debug(cpu_env); - /* The address covered by the breakpoint must be included in - [tb->pc, tb->pc + tb->size) in order to for it to be - properly cleared -- thus we increment the PC here so that - the logic setting tb->size below does the right thing. */ - ctx->base.pc_next += 4; - goto done_generating; - } +static void mips_tr_tb_start(DisasContextBase *dcbase, CPUState *cs) +{ +} - if (ctx->base.num_insns == max_insns && (tb_cflags(tb) & CF_LAST_IO)) { - gen_io_start(); - } +static void mips_tr_insn_start(DisasContextBase *dcbase, CPUState *cs) +{ + DisasContext *ctx = container_of(dcbase, DisasContext, base); - is_slot = ctx->hflags & MIPS_HFLAG_BMASK; - if (!(ctx->hflags & MIPS_HFLAG_M16)) { - ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next); - insn_bytes = 4; - decode_opc(env, ctx); - } else if (ctx->insn_flags & ASE_MICROMIPS) { - ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next); - insn_bytes = decode_micromips_opc(env, ctx); - } else if (ctx->insn_flags & ASE_MIPS16) { - ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next); - insn_bytes = decode_mips16_opc(env, ctx); - } else { - generate_exception_end(ctx, EXCP_RI); - break; - } + tcg_gen_insn_start(ctx->base.pc_next, ctx->hflags & MIPS_HFLAG_BMASK, + ctx->btarget); +} - if (ctx->hflags & MIPS_HFLAG_BMASK) { - if (!(ctx->hflags & (MIPS_HFLAG_BDS16 | MIPS_HFLAG_BDS32 | - MIPS_HFLAG_FBNSLOT))) { - /* force to generate branch as there is neither delay nor - forbidden slot */ - is_slot = 1; - } - if ((ctx->hflags & MIPS_HFLAG_M16) && - (ctx->hflags & MIPS_HFLAG_FBNSLOT)) { - /* Force to generate branch as microMIPS R6 doesn't restrict - branches in the forbidden slot. */ - is_slot = 1; - } - } - if (is_slot) { - gen_branch(ctx, insn_bytes); - } - ctx->base.pc_next += insn_bytes; +static bool mips_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cs, + const CPUBreakpoint *bp) +{ + DisasContext *ctx = container_of(dcbase, DisasContext, base); - /* Execute a branch and its delay slot as a single instruction. - This is what GDB expects and is consistent with what the - hardware does (e.g. if a delay slot instruction faults, the - reported PC is the PC of the branch). */ - if (ctx->base.singlestep_enabled && - (ctx->hflags & MIPS_HFLAG_BMASK) == 0) { - break; - } + save_cpu_state(ctx, 1); + ctx->base.is_jmp = DISAS_NORETURN; + gen_helper_raise_exception_debug(cpu_env); + /* The address covered by the breakpoint must be included in + [tb->pc, tb->pc + tb->size) in order to for it to be + properly cleared -- thus we increment the PC here so that + the logic setting tb->size below does the right thing. */ + ctx->base.pc_next += 4; + return true; +} - if (ctx->base.pc_next - page_start >= TARGET_PAGE_SIZE) { - break; - } +static void mips_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs) +{ + CPUMIPSState *env = cs->env_ptr; + DisasContext *ctx = container_of(dcbase, DisasContext, base); + int insn_bytes; + int is_slot; - if (tcg_op_buf_full()) { - break; - } + is_slot = ctx->hflags & MIPS_HFLAG_BMASK; + if (!(ctx->hflags & MIPS_HFLAG_M16)) { + ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next); + insn_bytes = 4; + decode_opc(env, ctx); + } else if (ctx->insn_flags & ASE_MICROMIPS) { + ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next); + insn_bytes = decode_micromips_opc(env, ctx); + } else if (ctx->insn_flags & ASE_MIPS16) { + ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next); + insn_bytes = decode_mips16_opc(env, ctx); + } else { + generate_exception_end(ctx, EXCP_RI); + g_assert(ctx->base.is_jmp == DISAS_NORETURN); + return; + } - if (ctx->base.num_insns >= max_insns) { - break; + if (ctx->hflags & MIPS_HFLAG_BMASK) { + if (!(ctx->hflags & (MIPS_HFLAG_BDS16 | MIPS_HFLAG_BDS32 | + MIPS_HFLAG_FBNSLOT))) { + /* force to generate branch as there is neither delay nor + forbidden slot */ + is_slot = 1; + } + if ((ctx->hflags & MIPS_HFLAG_M16) && + (ctx->hflags & MIPS_HFLAG_FBNSLOT)) { + /* Force to generate branch as microMIPS R6 doesn't restrict + branches in the forbidden slot. */ + is_slot = 1; } + } + if (is_slot) { + gen_branch(ctx, insn_bytes); + } + ctx->base.pc_next += insn_bytes; - if (singlestep) - break; + if (ctx->base.is_jmp != DISAS_NEXT) { + return; } - if (tb_cflags(tb) & CF_LAST_IO) { - gen_io_end(); + /* Execute a branch and its delay slot as a single instruction. + This is what GDB expects and is consistent with what the + hardware does (e.g. if a delay slot instruction faults, the + reported PC is the PC of the branch). */ + if (ctx->base.singlestep_enabled && + (ctx->hflags & MIPS_HFLAG_BMASK) == 0) { + ctx->base.is_jmp = DISAS_TOO_MANY; + } + if (ctx->base.pc_next - ctx->page_start >= TARGET_PAGE_SIZE) { + ctx->base.is_jmp = DISAS_TOO_MANY; } +} + +static void mips_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs) +{ + DisasContext *ctx = container_of(dcbase, DisasContext, base); + if (ctx->base.singlestep_enabled && ctx->base.is_jmp != DISAS_NORETURN) { save_cpu_state(ctx, ctx->base.is_jmp != DISAS_EXIT); gen_helper_raise_exception_debug(cpu_env); @@ -20347,6 +20339,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) tcg_gen_lookup_and_goto_ptr(); break; case DISAS_NEXT: + case DISAS_TOO_MANY: save_cpu_state(ctx, 0); gen_goto_tb(ctx, 0, ctx->base.pc_next); break; @@ -20354,28 +20347,34 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) tcg_gen_exit_tb(0); break; case DISAS_NORETURN: - default: break; + default: + g_assert_not_reached(); } } -done_generating: - gen_tb_end(tb, ctx->base.num_insns); - - tb->size = ctx->base.pc_next - ctx->base.pc_first; - tb->icount = ctx->base.num_insns; - -#ifdef DEBUG_DISAS - LOG_DISAS("\n"); - if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM) - && qemu_log_in_addr_range(ctx->base.pc_first)) { - qemu_log_lock(); - qemu_log("IN: %s\n", lookup_symbol(ctx->base.pc_first)); - log_target_disas(cs, ctx->base.pc_first, - ctx->base.pc_next - ctx->base.pc_first); - qemu_log("\n"); - qemu_log_unlock(); - } -#endif +} + +static void mips_tr_disas_log(const DisasContextBase *dcbase, CPUState *cs) +{ + qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first)); + log_target_disas(cs, dcbase->pc_first, dcbase->tb->size); +} + +static const TranslatorOps mips_tr_ops = { + .init_disas_context = mips_tr_init_disas_context, + .tb_start = mips_tr_tb_start, + .insn_start = mips_tr_insn_start, + .breakpoint_check = mips_tr_breakpoint_check, + .translate_insn = mips_tr_translate_insn, + .tb_stop = mips_tr_tb_stop, + .disas_log = mips_tr_disas_log, +}; + +void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) +{ + DisasContext ctx; + + translator_loop(&mips_tr_ops, &ctx.base, cs, tb); } static void fpu_dump_state(CPUMIPSState *env, FILE *f, fprintf_function fpu_fprintf, -- cgit v1.2.1