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hw/timer/renesas_tmr: Add default-case asserts in read_tcnt() 

In commit 81b3ddaf87 we fixed a use of uninitialized data
in read_tcnt(). However this change wasn't enough to placate
Coverity, which is not smart enough to see that if we read a
2 bit field and then handle cases 0, 1, 2 and 3 then there cannot
be a flow of execution through the switch default. Add explicit
default cases which assert that they can't be reached, which
should help silence Coverity.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210319162458.13760-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-03-30 14:05:34 +01:00
parent f7fb73b8cd
commit b9e3f1579a
1 changed files with 4 additions and 0 deletions
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4
hw/timer/renesas_tmr.c
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@ -146,6 +146,8 @@ static uint16_t read_tcnt(RTMRState *tmr, unsigned size, int ch)
case CSS_CASCADING:
tcnt[1] = tmr->tcnt[1];
break;
default:
g_assert_not_reached();
}
switch (FIELD_EX8(tmr->tccr[0], TCCR, CSS)) {
case CSS_INTERNAL:
@ -159,6 +161,8 @@ static uint16_t read_tcnt(RTMRState *tmr, unsigned size, int ch)
case CSS_EXTERNAL: /* QEMU doesn't implement this */
tcnt[0] = tmr->tcnt[0];
break;
default:
g_assert_not_reached();
}
} else {
tcnt[0] = tmr->tcnt[0];