From 76f521e6c31aa998953c56b82de0c95fb124edf5 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 8 Oct 2018 14:23:01 -0400 Subject: [PATCH] target/arm: Add v8M stack checks for VLDM/VSTM 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 --- qemu/target/arm/translate.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/qemu/target/arm/translate.c b/qemu/target/arm/translate.c index fcabc8f5..066c2a8b 100644 --- a/qemu/target/arm/translate.c +++ b/qemu/target/arm/translate.c @@ -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