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target/i386: Move helper_check_io to sysemu

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The we never allow i/o from user-only, and the tss check
that helper_check_io does will always fail.  Use an ifdef
within gen_check_io and return false, indicating that an
exception is known to be raised.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-50-richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-05-14 10:13:41 -05:00
parent e497803556
commit d76b9c6f07
4 changed files with 40 additions and 30 deletions
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11
target/i386/tcg/translate.c
View file

@ -203,7 +203,6 @@ STUB_HELPER(read_crN, TCGv ret, TCGv_env env, TCGv_i32 reg)
STUB_HELPER(set_dr, TCGv_env env, TCGv_i32 reg, TCGv val)
STUB_HELPER(stgi, TCGv_env env)
STUB_HELPER(svm_check_intercept, TCGv_env env, TCGv_i32 type)
STUB_HELPER(svm_check_io, TCGv_env env, TCGv_i32 port, TCGv_i32 p, TCGv_i32 a)
STUB_HELPER(vmload, TCGv_env env, TCGv_i32 aflag)
STUB_HELPER(vmmcall, TCGv_env env)
STUB_HELPER(vmrun, TCGv_env env, TCGv_i32 aflag, TCGv_i32 pc_ofs)
@ -217,6 +216,7 @@ 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, MemOp ot, int d);
static void gen_exception_gpf(DisasContext *s);
/* i386 arith/logic operations */
enum {
@ -681,6 +681,14 @@ static void gen_helper_out_func(MemOp ot, TCGv_i32 v, TCGv_i32 n)
static bool gen_check_io(DisasContext *s, MemOp ot, TCGv_i32 port,
uint32_t svm_flags)
{
#ifdef CONFIG_USER_ONLY
/*
* We do not implement the ioperm(2) syscall, so the TSS check
* will always fail.
*/
gen_exception_gpf(s);
return false;
#else
if (PE(s) && (CPL(s) > IOPL(s) || VM86(s))) {
gen_helper_check_io(cpu_env, port, tcg_constant_i32(1 << ot));
}
@ -699,6 +707,7 @@ static bool gen_check_io(DisasContext *s, MemOp ot, TCGv_i32 port,
tcg_constant_i32(next_eip - cur_eip));
}
return true;
#endif
}
static inline void gen_movs(DisasContext *s, MemOp ot)