qemu/target/arm
Peter Maydell fa856736b6 target/arm: Don't NOCP fault for FPCXT_NS accesses
The M-profile architecture requires that accesses to FPCXT_NS when
there is no active FP state must not take a NOCP fault even if the
FPU is disabled. We were not implementing this correctly, because
in our decode we catch the NOCP faults early in m-nocp.decode.

Fix this bug by moving all the handling of M-profile FP system
register accesses from vfp.decode into m-nocp.decode and putting
it above the NOCP blocks. This provides the correct behaviour:
 * for accesses other than FPCXT_NS the trans functions call
   vfp_access_check(), which will check for FPU disabled and
   raise a NOCP exception if necessary
 * for FPCXT_NS we have the special case code that doesn't
   call vfp_access_check()
 * when these trans functions want to raise an UNDEF they return
   false, so the decoder will fall through into the NOCP blocks.
   This means that NOCP correctly takes precedence over UNDEF
   for these insns. (This is a difference from the other insns
   handled by m-nocp.decode, where UNDEF takes precedence and
   which we implement by having those trans functions call
   unallocated_encoding() in the appropriate places.)

[Note for backport to stable: this commit has a semantic dependency
on commit 9a486856e9, which was not marked as cc-stable because
we didn't know we'd need it for a for-stable bugfix.]

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210618141019.10671-4-peter.maydell@linaro.org
2021-06-21 16:49:37 +01:00
..
a32-uncond.decode
a32.decode
arch_dump.c
arm_ldst.h
arm-powerctl.c
arm-powerctl.h
cpu64.c target/arm: Enable BFloat16 extensions 2021-06-03 16:43:26 +01:00
cpu_tcg.c target/arm: Enable BFloat16 extensions 2021-06-03 16:43:26 +01:00
cpu-param.h linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE 2021-02-16 13:06:16 +00:00
cpu-qom.h
cpu.c target/arm: Enable BFloat16 extensions 2021-06-03 16:43:26 +01:00
cpu.h target/arm: Add isar_feature_{aa32, aa64, aa64_sve}_bf16 2021-06-03 16:43:25 +01:00
crypto_helper.c
debug_helper.c
gdbstub64.c
gdbstub.c target/arm: use official org.gnu.gdb.aarch64.sve layout for registers 2021-01-18 10:05:06 +00:00
helper-a64.c target/arm: Add wrapper macros for accessing tbflags 2021-04-30 11:16:50 +01:00
helper-a64.h target/arm: Merge mte_check1, mte_checkN 2021-04-30 11:16:49 +01:00
helper-sve.h target/arm: Implement vector float32 to bfloat16 conversion 2021-06-03 16:43:26 +01:00
helper.c target/arm: Add ID_AA64ZFR0 fields and isar_feature_aa64_sve2 2021-05-25 16:01:43 +01:00
helper.h target/arm: Implement bfloat widening fma (indexed) 2021-06-03 16:43:26 +01:00
idau.h
internals.h target/arm: Rename mte_probe1 to mte_probe 2021-04-30 11:16:49 +01:00
iwmmxt_helper.c
kvm64.c target/arm: Use acpi_ghes_present() to see if we report ACPI memory errors 2021-06-21 16:49:37 +01:00
kvm_arm.h hw/arm/virt: KVM: The IPA lower bound is 32 2021-03-12 12:47:11 +00:00
kvm-consts.h
kvm-stub.c
kvm.c hw/arm/virt: KVM: The IPA lower bound is 32 2021-03-12 12:47:11 +00:00
m_helper.c target/arm: Handle VPR semantics in existing code 2021-06-16 14:33:52 +01:00
m-nocp.decode target/arm: Don't NOCP fault for FPCXT_NS accesses 2021-06-21 16:49:37 +01:00
machine.c target/arm: Make FPSCR.LTPSIZE writable for MVE 2021-06-03 16:43:25 +01:00
meson.build target/arm: Add framework for MVE decode 2021-06-16 14:33:52 +01:00
monitor.c target/arm: Add cpu properties to control pauth 2021-01-19 14:38:51 +00:00
mte_helper.c target/arm: Fix mte page crossing test 2021-06-16 14:33:51 +01:00
mve.decode target/arm: Add framework for MVE decode 2021-06-16 14:33:52 +01:00
neon_helper.c target/arm: Split out saturating/rounding shifts from neon 2021-05-25 16:01:43 +01:00
neon-dp.decode target/arm: Implement vector float32 to bfloat16 conversion 2021-06-03 16:43:26 +01:00
neon-ls.decode target/arm: Fix decode of align in VLDST_single 2021-04-30 11:16:49 +01:00
neon-shared.decode target/arm: Implement bfloat widening fma (indexed) 2021-06-03 16:43:26 +01:00
op_addsub.h
op_helper.c target/arm: use raise_exception_ra for stack limit exception 2021-06-03 16:43:25 +01:00
pauth_helper.c target/arm: Implement an IMPDEF pauth algorithm 2021-01-19 14:38:51 +00:00
psci.c
sve_helper.c bitops.h: Provide hswap32(), hswap64(), wswap64() swapping operations 2021-06-16 14:33:52 +01:00
sve.decode target/arm: Implement bfloat widening fma (indexed) 2021-06-03 16:43:26 +01:00
syndrome.h target/arm: Split out syndrome.h from internals.h 2021-02-16 13:16:18 +00:00
t16.decode
t32.decode target/arm: Implement MVE LETP insn 2021-06-16 14:33:52 +01:00
tlb_helper.c target/arm: Set ARMMMUFaultInfo.level in user-only arm_cpu_tlb_fill 2021-03-23 14:07:55 +00:00
trace-events docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
trace.h
translate-a32.h target/arm: Don't NOCP fault for FPCXT_NS accesses 2021-06-21 16:49:37 +01:00
translate-a64.c target/arm: Diagnose UNALLOCATED in disas_simd_three_reg_same_fp16 2021-06-15 16:18:48 +01:00
translate-a64.h target/arm: Implement SVE2 XAR 2021-05-25 16:01:44 +01:00
translate-m-nocp.c target/arm: Don't NOCP fault for FPCXT_NS accesses 2021-06-21 16:49:37 +01:00
translate-mve.c target/arm: Add framework for MVE decode 2021-06-16 14:33:52 +01:00
translate-neon.c target/arm: Implement bfloat widening fma (indexed) 2021-06-03 16:43:26 +01:00
translate-sve.c target/arm: Implement bfloat widening fma (indexed) 2021-06-03 16:43:26 +01:00
translate-vfp.c target/arm: Don't NOCP fault for FPCXT_NS accesses 2021-06-21 16:49:37 +01:00
translate.c target/arm: Add framework for MVE decode 2021-06-16 14:33:52 +01:00
translate.h target/arm: Add handling for PSR.ECI/ICI 2021-06-16 14:33:52 +01:00
vec_helper.c target/arm: Move expand_pred_b() data to vec_helper.c 2021-06-16 14:33:52 +01:00
vec_internal.h target/arm: Move expand_pred_b() data to vec_helper.c 2021-06-16 14:33:52 +01:00
vfp_helper.c target/arm: Enable FPSCR.QC bit for MVE 2021-06-16 14:33:52 +01:00
vfp-uncond.decode
vfp.decode target/arm: Don't NOCP fault for FPCXT_NS accesses 2021-06-21 16:49:37 +01:00