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target/arm: Add v8M stack checks for VLDM/VSTM

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Add the v8M stack checks for the VLDM/VSTM
(aka VPUSH/VPOP) instructions. This code is currently
unreachable because we haven't yet implemented M profile
floating point support, but since the change is simple,
we add it now because otherwise we're likely to forget to
do it later.

Backports commit 8a954faf5412d5073d585d85a1da63a09bb5d84e from qemu
This commit is contained in:
Peter Maydell 2018-10-08 14:23:01 -04:00 committed by Lioncash
parent 37d0c7fcf1
commit 76f521e6c3
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 0 deletions
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12
qemu/target/arm/translate.c
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@ -4349,6 +4349,18 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
if (insn & (1 << 24)) /* pre-decrement */
tcg_gen_addi_i32(tcg_ctx, addr, addr, 0-((insn & 0xff) << 2));
if (s->v8m_stackcheck && rn == 13 && w) {
/*
* Here 'addr' is the lowest address we will store to,
* and is either the old SP (if post-increment) or
* the new SP (if pre-decrement). For post-increment
* where the old value is below the limit and the new
* value is above, it is UNKNOWN whether the limit check
* triggers; we choose to trigger.
*/
gen_helper_v8m_stackcheck(tcg_ctx, tcg_ctx->cpu_env, addr);
}
if (dp)
offset = 8;
else