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unicorn/qemu/target/arm
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Peter Maydell 0d89bce217
target/arm: Execute Thumb instructions when their condbits are 0xf 
Thumb instructions in an IT block are set up to be conditionally
executed depending on a set of condition bits encoded into the IT
bits of the CPSR/XPSR. The architecture specifies that if the
condition bits are 0b1111 this means "always execute" (like 0b1110),
not "never execute"; we were treating it as "never execute". (See
the ConditionHolds() pseudocode in both the A-profile and M-profile
Arm ARM.)

This is a bit of an obscure corner case, because the only legal
way to get to an 0b1111 set of condbits is to do an exception
return which sets the XPSR/CPSR up that way. An IT instruction
which encodes a condition sequence that would include an 0b1111 is
UNPREDICTABLE, and for v8A the CONSTRAINED UNPREDICTABLE choices
for such an IT insn are to NOP, UNDEF, or treat 0b1111 like 0b1110.
Add a comment noting that we take the latter option.

Backports commit 5529de1e5512c05276825fa8b922147663fd6eac from qemu
2019-08-08 18:07:57 -04:00
..
arm-powerctl.c arm: Clarify the logic of set_pc() 2019-02-03 17:55:30 -05:00
arm-powerctl.h ARM: Factor out ARM on/off PSCI control functions 2018-03-01 23:31:47 -05:00
arm_ldst.h Fix Thumb-1 BE32 execution and disassembly. 2018-03-02 00:20:11 -05:00
cpu-param.h tcg: Split out target/arch/cpu-param.h 2019-06-10 19:35:46 -04:00
cpu-qom.h target/arm: Add "-cpu max" support 2018-03-12 10:11:49 -04:00
cpu.c target/arm: Move debug routines to debug_helper.c 2019-08-08 17:46:56 -04:00
cpu.h target/arm: Restrict semi-hosting to TCG 2019-08-08 17:48:34 -04:00
cpu64.c target/arm: Use env_cpu, env_archcpu 2019-06-12 11:34:08 -04:00
crypto_helper.c target/arm/cpu and crypto_helper: Correct bad merge and adjust to qemu code style 2018-03-12 11:57:24 -04:00
debug_helper.c target/arm: Move debug routines to debug_helper.c 2019-08-08 17:46:56 -04:00
helper-a64.c target/arm: Use env_cpu, env_archcpu 2019-06-12 11:34:08 -04:00
helper-a64.h target/arm: check CF_PARALLEL instead of parallel_cpus 2019-05-04 22:44:32 -04:00
helper-sve.h target/arm: Rewrite vector gather first-fault loads 2018-10-08 14:15:15 -04:00
helper.c target/arm/helper: Move M profile routines to m_helper.c 2019-08-08 18:04:08 -04:00
helper.h target/arm: Use tcg_gen_abs_i64 and tcg_gen_gvec_abs 2019-05-16 16:43:02 -04:00
internals.h target/arm: Declare some M-profile functions publicly 2019-08-08 15:37:01 -04:00
iwmmxt_helper.c target/arm: Untabify iwmmxt_helper.c 2018-08-25 04:33:44 -04:00
kvm-consts.h arm: better stub version for MISMATCH_CHECK 2018-03-02 00:13:45 -05:00
m_helper.c target/arm: Use _ra versions of cpu_stl_data() in v7M helpers 2019-08-08 18:06:23 -04:00
Makefile.objs target/arm/helper: Move M profile routines to m_helper.c 2019-08-08 18:04:08 -04:00
neon_helper.c target/arm: Use tcg_gen_abs_i64 and tcg_gen_gvec_abs 2019-05-16 16:43:02 -04:00
op_addsub.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
op_helper.c target/arm: Move debug routines to debug_helper.c 2019-08-08 17:46:56 -04:00
pauth_helper.c target/arm: Fix output of PAuth Auth 2019-06-13 16:17:00 -04:00
psci.c fix WFI/WFE length in syndrome register 2018-03-05 11:21:51 -05:00
sve.decode target/arm: Sychronize with qemu 2019-04-18 04:49:11 -04:00
sve_helper.c tcg: Use tlb_fill probe from tlb_vaddr_to_host 2019-05-16 18:27:03 -04:00
tlb_helper.c target/arm: Move TLB related routines to tlb_helper.c 2019-08-08 15:24:26 -04:00
translate-a64.c target/arm: Move vfp_expand_imm() to translate.[ch] 2019-06-25 18:17:49 -05:00
translate-a64.h target/arm: Move vfp_expand_imm() to translate.[ch] 2019-06-25 18:17:49 -05:00
translate-sve.c tcg: Specify optional vector requirements with a list 2019-05-16 15:05:02 -04:00
translate-vfp.inc.c target/arm: Check for dp support for dp VFM, not sp 2019-06-25 18:56:34 -05:00
translate.c target/arm: Execute Thumb instructions when their condbits are 0xf 2019-08-08 18:07:57 -04:00
translate.h target/arm: Remove unused cpu_F0s, cpu_F0d, cpu_F1s, cpu_F1d 2019-06-25 18:45:53 -05:00
unicorn.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
unicorn_aarch64.c unicorn_aarch64: Use aa64_vfp_qreg instead of aa32_vfp_dreg 2018-09-03 07:47:40 +01:00
unicorn_arm.c unicorn_arm: Treat registers as unsigned values in casts 2019-04-26 08:48:31 -04:00
vec_helper.c target/arm: Add helpers for FMLAL 2019-02-28 15:31:48 -05:00
vfp-uncond.decode target/arm: Convert VCVTA/VCVTN/VCVTP/VCVTM to decodetree 2019-06-13 16:54:42 -04:00
vfp.decode target/arm: Use vfp_expand_imm() for AArch32 VFP VMOV_imm 2019-06-25 18:20:19 -05:00
vfp_helper.c target/arm/vfp_helper: Restrict the SoftFloat use to TCG 2019-08-08 15:30:47 -04:00