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target-s390x: PER instruction-fetch event support

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For the PER instruction-fetch, we can't use the QEMU breakpoint
infrastructure as it triggers for a single address and not a full
address range, and as it actually stop before the instruction and
not before.

We therefore call an helper with the just fetched instruction address,
which check if the address is within the PER address range. If it is
the case, an event is recorded and will be signaled through an
exception.

Note that we implement here the PER-3 behaviour, that is an invalid
opcode is not considered as an instruction fetch. Without PER-3 this
behavious is undefined.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2015-06-13 00:45:58 +02:00 committed by Alexander Graf
parent 2c2275eb41
commit f0e0d817c2
3 changed files with 17 additions and 0 deletions
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1
target-s390x/helper.h
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@ -118,6 +118,7 @@ DEF_HELPER_FLAGS_3(stura, TCG_CALL_NO_WG, void, env, i64, i64)
DEF_HELPER_FLAGS_3(sturg, TCG_CALL_NO_WG, void, env, i64, i64)
DEF_HELPER_1(per_check_exception, void, env)
DEF_HELPER_FLAGS_3(per_branch, TCG_CALL_NO_RWG, void, env, i64, i64)
DEF_HELPER_FLAGS_2(per_ifetch, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_2(xsch, void, env, i64)
DEF_HELPER_2(csch, void, env, i64)

8
target-s390x/misc_helper.c
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@ -619,4 +619,12 @@ void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
}
}
}
void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
{
if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
env->per_address = addr;
env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
}
}
#endif

8
target-s390x/translate.c
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@ -5187,6 +5187,14 @@ static ExitStatus translate_one(CPUS390XState *env, DisasContext *s)
return EXIT_NORETURN;
}
#ifndef CONFIG_USER_ONLY
if (s->tb->flags & FLAG_MASK_PER) {
TCGv_i64 addr = tcg_const_i64(s->pc);
gen_helper_per_ifetch(cpu_env, addr);
tcg_temp_free_i64(addr);
}
#endif
/* Check for insn specification exceptions. */
if (insn->spec) {
int spec = insn->spec, excp = 0, r;