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target/i386: Add stub generator for helper_set_dr 

This removes an ifdef from the middle of disas_insn,
and ensures that the branch is not reachable.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-30-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-05-14 10:13:21 -05:00
parent a6f62100a8
commit 9f55e5a947
1 changed files with 13 additions and 2 deletions
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15
target/i386/tcg/translate.c
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@ -179,6 +179,19 @@ typedef struct DisasContext {
#define REX_B(S) 0
#endif
/*
* Many sysemu-only helpers are not reachable for user-only.
* Define stub generators here, so that we need not either sprinkle
* ifdefs through the translator, nor provide the helper function.
*/
#define STUB_HELPER(NAME, ...) \
static inline void gen_helper_##NAME(__VA_ARGS__) \
{ qemu_build_not_reached(); }
#ifdef CONFIG_USER_ONLY
STUB_HELPER(set_dr, TCGv_env env, TCGv_i32 reg, TCGv val)
#endif
static void gen_eob(DisasContext *s);
static void gen_jr(DisasContext *s, TCGv dest);
static void gen_jmp(DisasContext *s, target_ulong eip);
@ -8075,7 +8088,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
case 0x121: /* mov reg, drN */
case 0x123: /* mov drN, reg */
if (check_cpl0(s)) {
#ifndef CONFIG_USER_ONLY
modrm = x86_ldub_code(env, s);
/* Ignore the mod bits (assume (modrm&0xc0)==0xc0).
* AMD documentation (24594.pdf) and testing of
@ -8104,7 +8116,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
gen_helper_get_dr(s->T0, cpu_env, s->tmp2_i32);
gen_op_mov_reg_v(s, ot, rm, s->T0);
}
#endif /* !CONFIG_USER_ONLY */
}
break;
case 0x106: /* clts */