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[Qemu-arm] [PATCH 12/13] target/arm: Add v8M stack checks for VLDM/VSTM
From: |
Peter Maydell |
Subject: |
[Qemu-arm] [PATCH 12/13] target/arm: Add v8M stack checks for VLDM/VSTM |
Date: |
Tue, 2 Oct 2018 17:35:55 +0100 |
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.
Signed-off-by: Peter Maydell <address@hidden>
---
target/arm/translate.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index ef64d2559de..2d3a1be518b 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -4229,6 +4229,18 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
if (insn & (1 << 24)) /* pre-decrement */
tcg_gen_addi_i32(addr, addr, -((insn & 0xff) << 2));
+ if (rn == 13 && w && s->v8m_stackcheck) {
+ /*
+ * 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(cpu_env, addr);
+ }
+
if (dp)
offset = 8;
else
--
2.19.0
- Re: [Qemu-arm] [Qemu-devel] [PATCH 08/13] target/arm: Add v8M stack checks for LDRD/STRD (imm), (continued)