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target/i386: introduce gen_jr helper to generate lookup_and_goto_ptr

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This helper will be used by subsequent changes.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-9-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2017-04-26 23:29:21 -04:00 committed by Richard Henderson
parent 8a6b28c7b5
commit 1ebb1af1b8
1 changed files with 24 additions and 1 deletions
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25
target/i386/translate.c
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@ -141,6 +141,7 @@ typedef struct DisasContext {
} DisasContext;
static void gen_eob(DisasContext *s);
static void gen_jr(DisasContext *s, TCGv dest);
static void gen_jmp(DisasContext *s, target_ulong eip);
static void gen_jmp_tb(DisasContext *s, target_ulong eip, int tb_num);
static void gen_op(DisasContext *s1, int op, TCGMemOp ot, int d);
@ -2509,7 +2510,8 @@ static void gen_bnd_jmp(DisasContext *s)
If INHIBIT, set HF_INHIBIT_IRQ_MASK if it isn't already set.
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 gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf)
static void
do_gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf, TCGv jr)
{
gen_update_cc_op(s);
@ -2530,12 +2532,27 @@ static void gen_eob_worker(DisasContext *s, bool inhibit, bool recheck_tf)
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 {
tcg_gen_exit_tb(0);
}
s->is_jmp = DISAS_TB_JUMP;
}
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);
}
/* End of block.
If INHIBIT, set HF_INHIBIT_IRQ_MASK if it isn't already set. */
static void gen_eob_inhibit_irq(DisasContext *s, bool inhibit)
@ -2549,6 +2566,12 @@ static void gen_eob(DisasContext *s)
gen_eob_worker(s, false, false);
}
/* Jump to register */
static void gen_jr(DisasContext *s, TCGv dest)
{
do_gen_eob_worker(s, false, false, dest);
}
/* generate a jump to eip. No segment change must happen before as a
direct call to the next block may occur */
static void gen_jmp_tb(DisasContext *s, target_ulong eip, int tb_num)