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target/s390x: Re-implement a few EXECUTE target insns directly 

While the previous patch is required for proper conformance,
the vast majority of target insns are MVC and XC for implementing
memmove and memset respectively.  The next most common are CLC,
TR, and SVC.

Implementing these (and a few others for which we already have
an implementation) directly is faster than going through full
translation to a TB.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-05-24 14:34:10 -07:00
parent 303c681a8f
commit d376f123c7
1 changed files with 51 additions and 15 deletions
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60
target/s390x/mem_helper.c
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@ -200,7 +200,7 @@ uint32_t HELPER(oc)(CPUS390XState *env, uint32_t l, uint64_t dest,
}
/* memmove */
static void do_helper_mvc(CPUS390XState *env, uint32_t l, uint64_t dest,
static uint32_t do_helper_mvc(CPUS390XState *env, uint32_t l, uint64_t dest,
uint64_t src, uintptr_t ra)
{
uint32_t i;
@ -208,23 +208,22 @@ static void do_helper_mvc(CPUS390XState *env, uint32_t l, uint64_t dest,
HELPER_LOG("%s l %d dest %" PRIx64 " src %" PRIx64 "\n",
__func__, l, dest, src);
/* mvc and memmove do not behave the same when areas overlap! */
/* mvc with source pointing to the byte after the destination is the
same as memset with the first source byte */
if (dest == src + 1) {
fast_memset(env, dest, cpu_ldub_data_ra(env, src, ra), l + 1, ra);
return;
}
/* mvc and memmove do not behave the same when areas overlap! */
if (dest < src || src + l < dest) {
} else if (dest < src || src + l < dest) {
fast_memmove(env, dest, src, l + 1, ra);
return;
}
} else {
/* slow version with byte accesses which always work */
for (i = 0; i <= l; i++) {
cpu_stb_data_ra(env, dest + i, cpu_ldub_data_ra(env, src + i, ra), ra);
uint8_t x = cpu_ldub_data_ra(env, src + i, ra);
cpu_stb_data_ra(env, dest + i, x, ra);
}
}
return env->cc_op;
}
void HELPER(mvc)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
@ -692,7 +691,7 @@ void HELPER(unpk)(CPUS390XState *env, uint32_t len, uint64_t dest,
}
}
static void do_helper_tr(CPUS390XState *env, uint32_t len, uint64_t array,
static uint32_t do_helper_tr(CPUS390XState *env, uint32_t len, uint64_t array,
uint64_t trans, uintptr_t ra)
{
uint32_t i;
@ -702,12 +701,14 @@ static void do_helper_tr(CPUS390XState *env, uint32_t len, uint64_t array,
uint8_t new_byte = cpu_ldub_data_ra(env, trans + byte, ra);
cpu_stb_data_ra(env, array + i, new_byte, ra);
}
return env->cc_op;
}
void HELPER(tr)(CPUS390XState *env, uint32_t len, uint64_t array,
uint64_t trans)
{
return do_helper_tr(env, len, array, trans, GETPC());
do_helper_tr(env, len, array, trans, GETPC());
}
uint64_t HELPER(tre)(CPUS390XState *env, uint64_t array,
@ -1221,6 +1222,41 @@ void HELPER(ex)(CPUS390XState *env, uint32_t ilen, uint64_t r1, uint64_t addr)
g_assert_not_reached();
}
/* The very most common cases can be sped up by avoiding a new TB. */
if ((opc & 0xf0) == 0xd0) {
typedef uint32_t (*dx_helper)(CPUS390XState *, uint32_t, uint64_t,
uint64_t, uintptr_t);
static const dx_helper dx[16] = {
[0x2] = do_helper_mvc,
[0x4] = do_helper_nc,
[0x5] = do_helper_clc,
[0x6] = do_helper_oc,
[0x7] = do_helper_xc,
[0xc] = do_helper_tr,
[0xd] = do_helper_trt,
};
dx_helper helper = dx[opc & 0xf];
if (helper) {
uint32_t l = extract64(insn, 48, 8);
uint32_t b1 = extract64(insn, 44, 4);
uint32_t d1 = extract64(insn, 32, 12);
uint32_t b2 = extract64(insn, 28, 4);
uint32_t d2 = extract64(insn, 16, 12);
uint64_t a1 = get_address(env, 0, b1, d1);
uint64_t a2 = get_address(env, 0, b2, d2);
env->cc_op = helper(env, l, a1, a2, 0);
env->psw.addr += ilen;
return;
}
} else if (opc == 0x0a) {
env->int_svc_code = extract64(insn, 48, 8);
env->int_svc_ilen = ilen;
helper_exception(env, EXCP_SVC);
g_assert_not_reached();
}
/* Record the insn we want to execute as well as the ilen to use
during the execution of the target insn. This will also ensure
that ex_value is non-zero, which flags that we are in a state