diff options
Diffstat (limited to 'arch/arm64/kernel/syscall.c')
| -rw-r--r-- | arch/arm64/kernel/syscall.c | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index c2877c332f2d..b9cf12b271d7 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -65,35 +65,6 @@ static inline bool has_syscall_work(unsigned long flags) int syscall_trace_enter(struct pt_regs *regs); void syscall_trace_exit(struct pt_regs *regs); -#ifdef CONFIG_ARM64_ERRATUM_1463225 -DECLARE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); - -static void cortex_a76_erratum_1463225_svc_handler(void) -{ - u32 reg, val; - - if (!unlikely(test_thread_flag(TIF_SINGLESTEP))) - return; - - if (!unlikely(this_cpu_has_cap(ARM64_WORKAROUND_1463225))) - return; - - __this_cpu_write(__in_cortex_a76_erratum_1463225_wa, 1); - reg = read_sysreg(mdscr_el1); - val = reg | DBG_MDSCR_SS | DBG_MDSCR_KDE; - write_sysreg(val, mdscr_el1); - asm volatile("msr daifclr, #8"); - isb(); - - /* We will have taken a single-step exception by this point */ - - write_sysreg(reg, mdscr_el1); - __this_cpu_write(__in_cortex_a76_erratum_1463225_wa, 0); -} -#else -static void cortex_a76_erratum_1463225_svc_handler(void) { } -#endif /* CONFIG_ARM64_ERRATUM_1463225 */ - static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, const syscall_fn_t syscall_table[]) { @@ -120,7 +91,6 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr, * (Similarly for HVC and SMC elsewhere.) */ - cortex_a76_erratum_1463225_svc_handler(); local_daif_restore(DAIF_PROCCTX); if (flags & _TIF_MTE_ASYNC_FAULT) { |