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Re: [Qemu-devel] [PATCH v5 10/19] target/i386: introduce gen_jr helper t
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [PATCH v5 10/19] target/i386: introduce gen_jr helper to generate lookup_and_goto_ptr |
Date: |
Fri, 28 Apr 2017 17:50:50 +0100 |
User-agent: |
mu4e 0.9.19; emacs 25.2.17 |
Richard Henderson <address@hidden> writes:
> From: "Emilio G. Cota" <address@hidden>
>
> This helper will be used by subsequent changes.
>
> Signed-off-by: Emilio G. Cota <address@hidden>
> Message-Id: <address@hidden>
> Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
> ---
> target/i386/translate.c | 25 ++++++++++++++++++++++++-
> 1 file changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/target/i386/translate.c b/target/i386/translate.c
> index 1d1372f..f0e48dc 100644
> --- a/target/i386/translate.c
> +++ b/target/i386/translate.c
> @@ -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)
--
Alex Bennée
- Re: [Qemu-devel] [PATCH v5 05/19] tcg-runtime: add lookup_tb_ptr helper, (continued)
[Qemu-devel] [PATCH v5 06/19] tcg: introduce goto_ptr opcode, Richard Henderson, 2017/04/27
[Qemu-devel] [PATCH v5 10/19] target/i386: introduce gen_jr helper to generate lookup_and_goto_ptr, Richard Henderson, 2017/04/27
- Re: [Qemu-devel] [PATCH v5 10/19] target/i386: introduce gen_jr helper to generate lookup_and_goto_ptr,
Alex Bennée <=
[Qemu-devel] [PATCH v5 11/19] target/i386: optimize cross-page direct jumps in softmmu, Richard Henderson, 2017/04/27
[Qemu-devel] [PATCH v5 09/19] target/arm: optimize indirect branches, Richard Henderson, 2017/04/27
[Qemu-devel] [PATCH v5 08/19] target/arm: optimize cross-page direct jumps in softmmu, Richard Henderson, 2017/04/27
[Qemu-devel] [PATCH v5 04/19] exec-all: export tb_htable_lookup, Richard Henderson, 2017/04/27
[Qemu-devel] [PATCH v5 07/19] tcg: export tcg_gen_lookup_and_goto_ptr, Richard Henderson, 2017/04/27