| Message ID | 20210729004647.282017-17-richard.henderson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Unaligned accesses for user-only | expand |
On 7/29/21 2:46 AM, Richard Henderson wrote: > Cc: Max Filippov <jcmvbkbc@gmail.com> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > target/xtensa/cpu.c | 2 +- > target/xtensa/helper.c | 30 +++++++++++++++--------------- > 2 files changed, 16 insertions(+), 16 deletions(-) Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
On Thu, 29 Jul 2021 at 02:03, Richard Henderson <richard.henderson@linaro.org> wrote: > > Cc: Max Filippov <jcmvbkbc@gmail.com> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > target/xtensa/cpu.c | 2 +- > target/xtensa/helper.c | 30 +++++++++++++++--------------- > 2 files changed, 16 insertions(+), 16 deletions(-) The xtensa kernel has a CONFIG_XTENSA_UNALIGNED_USER option to make the kernel silently fix up unaligned userspace accesses, and most of the defconfigs for xtensa set it to 'y'. -- PMM
On 7/29/21 4:55 AM, Peter Maydell wrote: > On Thu, 29 Jul 2021 at 02:03, Richard Henderson > <richard.henderson@linaro.org> wrote: >> >> Cc: Max Filippov <jcmvbkbc@gmail.com> >> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> >> --- >> target/xtensa/cpu.c | 2 +- >> target/xtensa/helper.c | 30 +++++++++++++++--------------- >> 2 files changed, 16 insertions(+), 16 deletions(-) > > The xtensa kernel has a CONFIG_XTENSA_UNALIGNED_USER option to > make the kernel silently fix up unaligned userspace accesses, > and most of the defconfigs for xtensa set it to 'y'. I believe the load/store-exclusive instructions should still fault. r~
diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c index 58ec3a0862..41816d91f6 100644 --- a/target/xtensa/cpu.c +++ b/target/xtensa/cpu.c @@ -195,11 +195,11 @@ static const struct TCGCPUOps xtensa_tcg_ops = { .cpu_exec_interrupt = xtensa_cpu_exec_interrupt, .tlb_fill = xtensa_cpu_tlb_fill, .debug_excp_handler = xtensa_breakpoint_handler, + .do_unaligned_access = xtensa_cpu_do_unaligned_access, #ifndef CONFIG_USER_ONLY .do_interrupt = xtensa_cpu_do_interrupt, .do_transaction_failed = xtensa_cpu_do_transaction_failed, - .do_unaligned_access = xtensa_cpu_do_unaligned_access, #endif /* !CONFIG_USER_ONLY */ }; diff --git a/target/xtensa/helper.c b/target/xtensa/helper.c index f18ab383fd..a5296399c5 100644 --- a/target/xtensa/helper.c +++ b/target/xtensa/helper.c @@ -242,6 +242,21 @@ void xtensa_cpu_list(void) } } +void xtensa_cpu_do_unaligned_access(CPUState *cs, + vaddr addr, MMUAccessType access_type, + int mmu_idx, uintptr_t retaddr) +{ + XtensaCPU *cpu = XTENSA_CPU(cs); + CPUXtensaState *env = &cpu->env; + + assert(xtensa_option_enabled(env->config, + XTENSA_OPTION_UNALIGNED_EXCEPTION)); + cpu_restore_state(CPU(cpu), retaddr, true); + HELPER(exception_cause_vaddr)(env, + env->pc, LOAD_STORE_ALIGNMENT_CAUSE, + addr); +} + #ifdef CONFIG_USER_ONLY bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size, @@ -263,21 +278,6 @@ bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size, #else /* !CONFIG_USER_ONLY */ -void xtensa_cpu_do_unaligned_access(CPUState *cs, - vaddr addr, MMUAccessType access_type, - int mmu_idx, uintptr_t retaddr) -{ - XtensaCPU *cpu = XTENSA_CPU(cs); - CPUXtensaState *env = &cpu->env; - - assert(xtensa_option_enabled(env->config, - XTENSA_OPTION_UNALIGNED_EXCEPTION)); - cpu_restore_state(CPU(cpu), retaddr, true); - HELPER(exception_cause_vaddr)(env, - env->pc, LOAD_STORE_ALIGNMENT_CAUSE, - addr); -} - bool xtensa_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr)
Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- target/xtensa/cpu.c | 2 +- target/xtensa/helper.c | 30 +++++++++++++++--------------- 2 files changed, 16 insertions(+), 16 deletions(-)