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target/arm: Fix handling of cortex-m FTYPE flag in EXCRET 

According to the PushStack() pseudocode in the armv7m RM,
bit 4 of the LR should be set to NOT(CONTROL.PFCA) when
an FPU is present. Current implementation is doing it for
armv8, but not for armv7. This patch makes the existing
logic applicable to both code paths.

Signed-off-by: Jean-Hugues Deschenes <jean-hugues.deschenes@ossiaco.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jean-Hugues Deschênes 2019-11-26 13:55:36 +00:00 committed by Peter Maydell
parent 4ecc984210
commit f900b1e5b0
1 changed files with 3 additions and 4 deletions
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7
target/arm/m_helper.c
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@ -2233,19 +2233,18 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
if (env->v7m.secure) {
lr |= R_V7M_EXCRET_S_MASK;
}
if (!(env->v7m.control[M_REG_S] & R_V7M_CONTROL_FPCA_MASK)) {
lr |= R_V7M_EXCRET_FTYPE_MASK;
}
} else {
lr = R_V7M_EXCRET_RES1_MASK |
R_V7M_EXCRET_S_MASK |
R_V7M_EXCRET_DCRS_MASK |
R_V7M_EXCRET_FTYPE_MASK |
R_V7M_EXCRET_ES_MASK;
if (env->v7m.control[M_REG_NS] & R_V7M_CONTROL_SPSEL_MASK) {
lr |= R_V7M_EXCRET_SPSEL_MASK;
}
}
if (!(env->v7m.control[M_REG_S] & R_V7M_CONTROL_FPCA_MASK)) {
lr |= R_V7M_EXCRET_FTYPE_MASK;
}
if (!arm_v7m_is_handler_mode(env)) {
lr |= R_V7M_EXCRET_MODE_MASK;
}