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

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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.

Backports commit f900b1e5b087a02199fbb6de7038828008e9e419 from qemu
This commit is contained in:
Jean-Hugues Deschênes 2019-11-28 03:40:31 -05:00 committed by Lioncash
parent eadeae183d
commit a2194585bb
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 4 deletions
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7
qemu/target/arm/m_helper.c
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@ -2176,19 +2176,18 @@ 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;
}