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268b1b3dfb
xemu/target/arm
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Peter Maydell 268b1b3dfb target/arm: Allow user-mode code to write CPSR.E via MSR 
Using the MSR instruction to write to CPSR.E is deprecated, but it is
required to work from any mode including unprivileged code.  We were
incorrectly forbidding usermode code from writing it because
CPSR_USER did not include the CPSR_E bit.

We use CPSR_USER in only three places:
 * as the mask of what to allow userspace MSR to write to CPSR
 * when deciding what bits a linux-user signal-return should be
   able to write from the sigcontext structure
 * in target_user_copy_regs() when we set up the initial
   registers for the linux-user process

In the first two cases not being able to update CPSR.E is a bug, and
in the third case it doesn't matter because CPSR.E is always 0 there.
So we can fix both bugs by adding CPSR_E to CPSR_USER.

Because the cpsr_write() in restore_sigcontext() is now changing
a CPSR bit which is cached in hflags, we need to add an
arm_rebuild_hflags() call there; the callsite in
target_user_copy_regs() was already rebuilding hflags for other
reasons.

(The recommended way to change CPSR.E is to use the 'SETEND'
instruction, which we do correctly allow from usermode code.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200518142801.20503-1-peter.maydell@linaro.org
2020-05-21 22:05:27 +01:00
..
a32-uncond.decode target/arm: Convert Unallocated memory hint 2019-09-05 13:23:03 +01:00
a32.decode target/arm: Convert SVC 2019-09-05 13:23:03 +01:00
arch_dump.c target/arm: Add isar_feature_aa32_vfp_simd 2020-02-28 16:14:57 +00:00
arm_ldst.h target/arm: fetch code with translator_ld 2019-10-28 15:12:38 +00:00
arm-powerctl.c arm/arm-powerctl: rebuild hflags after setting CP15 bits in arm_set_cpu_on() 2019-12-20 14:03:00 +00:00
arm-powerctl.h target/arm/arm-powerctl: Add new arm_set_cpu_on_and_reset() 2019-02-28 11:03:04 +00:00
arm-semi.c target/arm/arm-semi: Don't let the guest close stdin/stdout/stderr 2020-01-30 16:02:01 +00:00
cpu64.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
cpu_tcg.c target/arm: Use correct GDB XML for M-profile cores 2020-05-14 15:03:08 +01:00
cpu-param.h target/arm: Don't use a TLB for ARMMMUIdx_Stage2 2020-05-04 10:32:46 +01:00
cpu-qom.h target/arm: Make cpu_register() available for other files 2020-04-30 15:35:41 +01:00
cpu.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
cpu.h target/arm: Allow user-mode code to write CPSR.E via MSR 2020-05-21 22:05:27 +01:00
crypto_helper.c target: Do not include "exec/exec-all.h" if it is not necessary 2018-06-01 14:15:10 +02:00
debug_helper.c target/arm: Stop assuming DBGDIDR always exists 2020-02-21 16:07:01 +00:00
gdbstub64.c gdbstub: extend GByteArray to read register helpers 2020-03-17 17:38:38 +00:00
gdbstub.c target/arm: Use correct GDB XML for M-profile cores 2020-05-14 15:03:08 +01:00
helper-a64.c target/arm: Move helper_dc_zva to helper-a64.c 2020-03-05 16:09:20 +00:00
helper-a64.h target/arm: Use DEF_HELPER_FLAGS for helper_dc_zva 2020-03-05 16:09:21 +00:00
helper-sve.h target/arm: Use tcg_gen_gvec_5_ptr for sve FMLA/FCMLA 2020-05-11 11:59:22 +01:00
helper.c target-arm: kvm64: handle SIGBUS signal from kernel or KVM 2020-05-14 15:03:09 +01:00
helper.h target/arm: Move 'env' argument of recps_f32 and rsqrts_f32 helpers to usual place 2020-05-14 15:03:09 +01:00
idau.h qom: make interface types abstract 2018-12-11 15:45:22 -02:00
internals.h target-arm: kvm64: handle SIGBUS signal from kernel or KVM 2020-05-14 15:03:09 +01:00
iwmmxt_helper.c target/arm: Untabify iwmmxt_helper.c 2018-08-24 13:17:48 +01:00
kvm32.c target/arm/kvm: Inline set_feature() calls 2020-05-11 11:45:59 +01:00
kvm64.c target-arm: kvm64: handle SIGBUS signal from kernel or KVM 2020-05-14 15:03:09 +01:00
kvm_arm.h target/arm/kvm: Let kvm_arm_vgic_probe() return a bitmap 2020-03-12 16:27:33 +00:00
kvm-consts.h arm: add trailing ; after MISMATCH_CHECK 2017-02-01 03:37:18 +02:00
kvm-stub.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
kvm.c qom: Drop parameter @errp of object_property_add() & friends 2020-05-15 07:07:58 +02:00
m_helper.c target/arm: Add isar_feature_aa32_vfp_simd 2020-02-28 16:14:57 +00:00
machine.c target/arm: Add isar_feature_aa64_fp_simd, isar_feature_aa32_vfp 2020-02-28 16:14:57 +00:00
Makefile.objs target/arm: Restrict TCG cpus to TCG accel 2020-05-11 11:45:59 +01:00
monitor.c Use &error_abort instead of separate assert() 2020-03-17 16:05:40 +01:00
neon_helper.c target/arm: Convert Neon VADD, VSUB, VABD 3-reg-same insns to decodetree 2020-05-14 15:03:09 +01:00
neon-dp.decode target/arm: Convert NEON VFMA, VFMS 3-reg-same insns to decodetree 2020-05-14 15:03:09 +01:00
neon-ls.decode target/arm: Convert Neon 'load/store single structure' to decodetree 2020-05-04 12:57:56 +01:00
neon-shared.decode target/arm: Convert VFM[AS]L (scalar) to decodetree 2020-05-04 12:57:56 +01:00
op_addsub.h
op_helper.c target/arm: Move helper_dc_zva to helper-a64.c 2020-03-05 16:09:20 +00:00
pauth_helper.c target/arm: Use bit 55 explicitly for pauth 2020-02-21 16:07:00 +00:00
psci.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
sve_helper.c softfloat: Replace flag with bool 2020-05-19 08:40:50 -07:00
sve.decode target/arm: SVE brk[ab] merging does not have s bit 2019-01-07 15:23:45 +00:00
t16.decode target/arm: Convert T16, long branches 2019-09-05 13:23:04 +01:00
t32.decode target/arm: Convert TT 2019-09-05 13:23:03 +01:00
tlb_helper.c target-arm: kvm64: handle SIGBUS signal from kernel or KVM 2020-05-14 15:03:09 +01:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
translate-a64.c target/arm: Use clear_vec_high more effectively 2020-05-21 22:05:27 +01:00
translate-a64.h target/arm: Convert Neon 3-reg-same VADD/VSUB to decodetree 2020-05-04 12:57:56 +01:00
translate-neon.inc.c target/arm: Convert NEON VFMA, VFMS 3-reg-same insns to decodetree 2020-05-14 15:03:09 +01:00
translate-sve.c target/arm: Fix tcg_gen_gvec_dup_imm vs DUP (indexed) 2020-05-11 14:22:54 +01:00
translate-vfp.inc.c target/arm/translate-vfp.inc.c: Remove duplicate simd_r32 check 2020-05-04 12:57:56 +01:00
translate.c target/arm: Remove unused GEN_NEON_INTEGER_OP macro 2020-05-21 20:00:18 +01:00
translate.h target/arm: Vectorize SABA/UABA 2020-05-14 15:03:08 +01:00
vec_helper.c target/arm: Convert Neon VADD, VSUB, VABD 3-reg-same insns to decodetree 2020-05-14 15:03:09 +01:00
vfp_helper.c softfloat: Name compare relation enum 2020-05-19 08:41:45 -07:00
vfp-uncond.decode target/arm: Split VMINMAXNM decode 2020-02-28 16:14:57 +00:00
vfp.decode target/arm: Split VFM decode 2020-02-28 16:14:57 +00:00