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tcg: remove addr argument from lookup_tb_ptr 

It is unlikely that we will ever want to call this helper passing
an argument other than the current PC. So just remove the argument,
and use the pc we already get from cpu_get_tb_cpu_state.

This change paves the way to having a common "tb_lookup" function.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-07-11 17:06:48 -04:00 committed by Richard Henderson
parent d453ec7825
commit 7f11636dbe
12 changed files with 32 additions and 42 deletions
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20
accel/tcg/tcg-runtime.c
View File

@ -144,33 +144,33 @@ uint64_t HELPER(ctpop_i64)(uint64_t arg)
return ctpop64(arg);
}
void *HELPER(lookup_tb_ptr)(CPUArchState *env, target_ulong addr)
void *HELPER(lookup_tb_ptr)(CPUArchState *env)
{
CPUState *cpu = ENV_GET_CPU(env);
TranslationBlock *tb;
target_ulong cs_base, pc;
uint32_t flags, addr_hash;
uint32_t flags, hash;
addr_hash = tb_jmp_cache_hash_func(addr);
tb = atomic_rcu_read(&cpu->tb_jmp_cache[addr_hash]);
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
hash = tb_jmp_cache_hash_func(pc);
tb = atomic_rcu_read(&cpu->tb_jmp_cache[hash]);
if (unlikely(!(tb
&& tb->pc == addr
&& tb->pc == pc
&& tb->cs_base == cs_base
&& tb->flags == flags
&& tb->trace_vcpu_dstate == *cpu->trace_dstate))) {
tb = tb_htable_lookup(cpu, addr, cs_base, flags);
tb = tb_htable_lookup(cpu, pc, cs_base, flags);
if (!tb) {
return tcg_ctx.code_gen_epilogue;
}
atomic_set(&cpu->tb_jmp_cache[addr_hash], tb);
atomic_set(&cpu->tb_jmp_cache[hash], tb);
}
qemu_log_mask_and_addr(CPU_LOG_EXEC, addr,
qemu_log_mask_and_addr(CPU_LOG_EXEC, pc,
"Chain %p [%d: " TARGET_FMT_lx "] %s\n",
tb->tc_ptr, cpu->cpu_index, addr,
lookup_symbol(addr));
tb->tc_ptr, cpu->cpu_index, pc,
lookup_symbol(pc));
return tb->tc_ptr;
}

2
accel/tcg/tcg-runtime.h
View File

@ -24,7 +24,7 @@ DEF_HELPER_FLAGS_1(clrsb_i64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(ctpop_i32, TCG_CALL_NO_RWG_SE, i32, i32)
DEF_HELPER_FLAGS_1(ctpop_i64, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_2(lookup_tb_ptr, TCG_CALL_NO_WG_SE, ptr, env, tl)
DEF_HELPER_FLAGS_1(lookup_tb_ptr, TCG_CALL_NO_WG_SE, ptr, env)
DEF_HELPER_FLAGS_1(exit_atomic, TCG_CALL_NO_WG, noreturn, env)

2
target/alpha/translate.c
View File

@ -3029,7 +3029,7 @@ static void alpha_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
/* FALLTHRU */
case DISAS_PC_UPDATED:
if (!use_exit_tb(ctx)) {
tcg_gen_lookup_and_goto_ptr(cpu_pc);
tcg_gen_lookup_and_goto_ptr();
break;
}
/* FALLTHRU */

4
target/arm/translate-a64.c
View File

@ -379,7 +379,7 @@ static inline void gen_goto_tb(DisasContext *s, int n, uint64_t dest)
} else if (s->base.singlestep_enabled) {
gen_exception_internal(EXCP_DEBUG);
} else {
tcg_gen_lookup_and_goto_ptr(cpu_pc);
tcg_gen_lookup_and_goto_ptr();
s->base.is_jmp = DISAS_NORETURN;
}
}
@ -11363,7 +11363,7 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
gen_a64_set_pc_im(dc->pc);
/* fall through */
case DISAS_JUMP:
tcg_gen_lookup_and_goto_ptr(cpu_pc);
tcg_gen_lookup_and_goto_ptr();
break;
case DISAS_EXIT:
tcg_gen_exit_tb(0);

5
target/arm/translate.c
View File

@ -4173,10 +4173,7 @@ static inline bool use_goto_tb(DisasContext *s, target_ulong dest)
static void gen_goto_ptr(void)
{
TCGv addr = tcg_temp_new();
tcg_gen_extu_i32_tl(addr, cpu_R[15]);
tcg_gen_lookup_and_goto_ptr(addr);
tcg_temp_free(addr);
tcg_gen_lookup_and_goto_ptr();
}
/* This will end the TB but doesn't guarantee we'll return to

6
target/hppa/translate.c
View File

@ -505,7 +505,7 @@ static void gen_goto_tb(DisasContext *ctx, int which,
if (ctx->base.singlestep_enabled) {
gen_excp_1(EXCP_DEBUG);
} else {
tcg_gen_lookup_and_goto_ptr(cpu_iaoq_f);
tcg_gen_lookup_and_goto_ptr();
}
}
}
@ -1515,7 +1515,7 @@ static DisasJumpType do_ibranch(DisasContext *ctx, TCGv dest,
if (link != 0) {
tcg_gen_movi_tl(cpu_gr[link], ctx->iaoq_n);
}
tcg_gen_lookup_and_goto_ptr(cpu_iaoq_f);
tcg_gen_lookup_and_goto_ptr();
return nullify_end(ctx, DISAS_NEXT);
} else {
cond_prep(&ctx->null_cond);
@ -3873,7 +3873,7 @@ static void hppa_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
if (ctx->base.singlestep_enabled) {
gen_excp_1(EXCP_DEBUG);
} else {
tcg_gen_lookup_and_goto_ptr(cpu_iaoq_f);
tcg_gen_lookup_and_goto_ptr();
}
break;
default:

17
target/i386/translate.c
View File

@ -2511,7 +2511,7 @@ static void gen_bnd_jmp(DisasContext *s)
If RECHECK_TF, emit a rechecking helper for #DB, ignoring the state of
S->TF. This is used by the syscall/sysret insns. */
static void
do_gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf, TCGv jr)
do_gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf, bool jr)
{
gen_update_cc_op(s);
@ -2532,12 +2532,8 @@ do_gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf, TCGv jr)
tcg_gen_exit_tb(0);
} else if (s->tf) {
gen_helper_single_step(cpu_env);
} else if (!TCGV_IS_UNUSED(jr)) {
TCGv vaddr = tcg_temp_new();
tcg_gen_add_tl(vaddr, jr, cpu_seg_base[R_CS]);
tcg_gen_lookup_and_goto_ptr(vaddr);
tcg_temp_free(vaddr);
} else if (jr) {
tcg_gen_lookup_and_goto_ptr();
} else {
tcg_gen_exit_tb(0);
}
@ -2547,10 +2543,7 @@ do_gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf, TCGv jr)
static inline void
gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf)
{
TCGv unused;
TCGV_UNUSED(unused);
do_gen_eob_worker(s, inhibit, recheck_tf, unused);
do_gen_eob_worker(s, inhibit, recheck_tf, false);
}
/* End of block.
@ -2569,7 +2562,7 @@ static void gen_eob(DisasContext *s)
/* Jump to register */
static void gen_jr(DisasContext *s, TCGv dest)
{
do_gen_eob_worker(s, false, false, dest);
do_gen_eob_worker(s, false, false, true);
}
/* generate a jump to eip. No segment change must happen before as a

4
target/mips/translate.c
View File

@ -4303,7 +4303,7 @@ static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
save_cpu_state(ctx, 0);
gen_helper_raise_exception_debug(cpu_env);
}
tcg_gen_lookup_and_goto_ptr(cpu_PC);
tcg_gen_lookup_and_goto_ptr();
}
}
@ -10883,7 +10883,7 @@ static void gen_branch(DisasContext *ctx, int insn_bytes)
save_cpu_state(ctx, 0);
gen_helper_raise_exception_debug(cpu_env);
}
tcg_gen_lookup_and_goto_ptr(cpu_PC);
tcg_gen_lookup_and_goto_ptr();
break;
default:
fprintf(stderr, "unknown branch 0x%x\n", proc_hflags);

2
target/s390x/translate.c
View File

@ -5949,7 +5949,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
} else if (use_exit_tb(&dc) || status == EXIT_PC_STALE_NOCHAIN) {
tcg_gen_exit_tb(0);
} else {
tcg_gen_lookup_and_goto_ptr(psw_addr);
tcg_gen_lookup_and_goto_ptr();
}
break;
default:

4
target/sh4/translate.c
View File

@ -261,7 +261,7 @@ static void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
} else if (use_exit_tb(ctx)) {
tcg_gen_exit_tb(0);
} else {
tcg_gen_lookup_and_goto_ptr(cpu_pc);
tcg_gen_lookup_and_goto_ptr();
}
}
}
@ -278,7 +278,7 @@ static void gen_jump(DisasContext * ctx)
} else if (use_exit_tb(ctx)) {
tcg_gen_exit_tb(0);
} else {
tcg_gen_lookup_and_goto_ptr(cpu_pc);
tcg_gen_lookup_and_goto_ptr();
}
} else {
gen_goto_tb(ctx, 0, ctx->delayed_pc);

4
tcg/tcg-op.c
View File

@ -2588,11 +2588,11 @@ void tcg_gen_goto_tb(unsigned idx)
tcg_gen_op1i(INDEX_op_goto_tb, idx);
}
void tcg_gen_lookup_and_goto_ptr(TCGv addr)
void tcg_gen_lookup_and_goto_ptr(void)
{
if (TCG_TARGET_HAS_goto_ptr && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
TCGv_ptr ptr = tcg_temp_new_ptr();
gen_helper_lookup_tb_ptr(ptr, tcg_ctx.tcg_env, addr);
gen_helper_lookup_tb_ptr(ptr, tcg_ctx.tcg_env);
tcg_gen_op1i(INDEX_op_goto_ptr, GET_TCGV_PTR(ptr));
tcg_temp_free_ptr(ptr);
} else {

4
tcg/tcg-op.h
View File

@ -797,7 +797,7 @@ static inline void tcg_gen_exit_tb(uintptr_t val)
void tcg_gen_goto_tb(unsigned idx);
/**
* tcg_gen_lookup_and_goto_ptr() - look up a TB and jump to it if valid
* tcg_gen_lookup_and_goto_ptr() - look up the current TB, jump to it if valid
* @addr: Guest address of the target TB
*
* If the TB is not valid, jump to the epilogue.
@ -805,7 +805,7 @@ void tcg_gen_goto_tb(unsigned idx);
* This operation is optional. If the TCG backend does not implement goto_ptr,
* this op is equivalent to calling tcg_gen_exit_tb() with 0 as the argument.
*/
void tcg_gen_lookup_and_goto_ptr(TCGv addr);
void tcg_gen_lookup_and_goto_ptr(void);
#if TARGET_LONG_BITS == 32
#define tcg_temp_new() tcg_temp_new_i32()