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[Qemu-devel] [PATCH 07/99] target/arm: Implement v8M VLLDM and VLSTM
From: |
Michael Roth |
Subject: |
[Qemu-devel] [PATCH 07/99] target/arm: Implement v8M VLLDM and VLSTM |
Date: |
Mon, 23 Jul 2018 15:16:16 -0500 |
From: Peter Maydell <address@hidden>
For v8M the instructions VLLDM and VLSTM support lazy saving
and restoring of the secure floating-point registers. Even
if the floating point extension is not implemented, these
instructions must act as NOPs in Secure state, so they can
be used as part of the secure-to-nonsecure call sequence.
Fixes: https://bugs.launchpad.net/qemu/+bug/1768295
Cc: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Message-id: address@hidden
(cherry picked from commit b1e5336a9899016c53d59eba53ebf6abcc21995c)
Signed-off-by: Michael Roth <address@hidden>
---
target/arm/translate.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index db1ce6510a..64b9bf33af 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -10783,8 +10783,23 @@ static void disas_thumb2_insn(DisasContext *s,
uint32_t insn)
/* Coprocessor. */
if (arm_dc_feature(s, ARM_FEATURE_M)) {
/* We don't currently implement M profile FP support,
- * so this entire space should give a NOCP fault.
+ * so this entire space should give a NOCP fault, with
+ * the exception of the v8M VLLDM and VLSTM insns, which
+ * must be NOPs in Secure state and UNDEF in Nonsecure state.
*/
+ if (arm_dc_feature(s, ARM_FEATURE_V8) &&
+ (insn & 0xffa00f00) == 0xec200a00) {
+ /* 0b1110_1100_0x1x_xxxx_xxxx_1010_xxxx_xxxx
+ * - VLLDM, VLSTM
+ * We choose to UNDEF if the RAZ bits are non-zero.
+ */
+ if (!s->v8m_secure || (insn & 0x0040f0ff)) {
+ goto illegal_op;
+ }
+ /* Just NOP since FP support is not implemented */
+ break;
+ }
+ /* All other insns: NOCP */
gen_exception_insn(s, 4, EXCP_NOCP, syn_uncategorized(),
default_exception_el(s));
break;
--
2.17.1
- [Qemu-devel] [PATCH 72/99] target/arm: Implement vector shifted FCVT for fp16, (continued)
- [Qemu-devel] [PATCH 72/99] target/arm: Implement vector shifted FCVT for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 71/99] target/arm: Implement vector shifted SCVF/UCVF for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 73/99] target/arm: Fix float16 to/from int16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 74/99] target/arm: Clear SVE high bits for FMOV, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 76/99] target/arm: Implement FMOV (general) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 77/99] target/arm: Implement FCVT (scalar, integer) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 75/99] fpu/softfloat: Fix conversion from uint64 to float128, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 78/99] target/arm: Implement FCVT (scalar, fixed-point) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 80/99] target/arm: Implement FP data-processing (2 source) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 79/99] target/arm: Introduce and use read_fp_hreg, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 07/99] target/arm: Implement v8M VLLDM and VLSTM,
Michael Roth <=
- [Qemu-devel] [PATCH 81/99] target/arm: Implement FP data-processing (3 source) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 84/99] target/arm: Implement FMOV (immediate) for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 83/99] target/arm: Implement FCSEL for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 82/99] target/arm: Implement FCMP for fp16, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 85/99] target/arm: Fix sqrt_f16 exception raising, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 86/99] hw/isa/superio: Fix inconsistent use of Chardev->be, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 87/99] mux: fix ctrl-a b again, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 88/99] nfs: Remove processed options from QDict, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 89/99] replace functions which are only available in glib-2.24, Michael Roth, 2018/07/23
- [Qemu-devel] [PATCH 90/99] vfio/pci: Default display option to "off", Michael Roth, 2018/07/23