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s390x/tcg: Ignore register content if b1/b2 is zero when handling EXECUTE 

In our EXECUTE fast path, we have to ignore the content of r0, if
specified by b1 or b2.

Fixes: d376f123c7 ("target/s390x: Re-implement a few EXECUTE target insns directly")
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210111163845.18148-6-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2021-01-11 17:38:45 +01:00 committed by Cornelia Huck
parent d944293d9a
commit e312fa1d78
1 changed files with 2 additions and 2 deletions
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target/s390x/mem_helper.c
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@ -2473,8 +2473,8 @@ void HELPER(ex)(CPUS390XState *env, uint32_t ilen, uint64_t r1, uint64_t addr)
uint32_t d1 = extract64(insn, 32, 12);
uint32_t b2 = extract64(insn, 28, 4);
uint32_t d2 = extract64(insn, 16, 12);
uint64_t a1 = wrap_address(env, env->regs[b1] + d1);
uint64_t a2 = wrap_address(env, env->regs[b2] + d2);
uint64_t a1 = wrap_address(env, (b1 ? env->regs[b1] : 0) + d1);
uint64_t a2 = wrap_address(env, (b2 ? env->regs[b2] : 0) + d2);
env->cc_op = helper(env, l, a1, a2, 0);
env->psw.addr += ilen;