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target/nios2: Cleanup set of CR_EXCEPTION for do_interrupt 

The register is entirely read-only for software, and we do not
implement ECC, so we need not deposit the cause into an existing
value; just create a new value from scratch.

Furthermore, exception.CAUSE is not written for break exceptions.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220421151735.31996-36-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-04-21 08:17:06 -07:00
parent af95a70a06
commit 34cccb7462
1 changed files with 4 additions and 3 deletions
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7
target/nios2/helper.c
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@ -54,9 +54,10 @@ static void do_exception(Nios2CPU *cpu, uint32_t exception_addr, bool is_break)
new_status &= ~(CR_STATUS_PIE | CR_STATUS_U);
env->ctrl[CR_STATUS] = new_status;
env->ctrl[CR_EXCEPTION] = FIELD_DP32(env->ctrl[CR_EXCEPTION],
CR_EXCEPTION, CAUSE,
cs->exception_index);
if (!is_break) {
env->ctrl[CR_EXCEPTION] = FIELD_DP32(0, CR_EXCEPTION, CAUSE,
cs->exception_index);
}
env->pc = exception_addr;
}