| /* SPDX-License-Identifier: GPL-2.0-only */ |
| #ifndef _ASM_X86_ENTRY_COMMON_H |
| #define _ASM_X86_ENTRY_COMMON_H |
| |
| /* Check that the stack and regs on entry from user mode are sane. */ |
| static __always_inline void arch_check_user_regs(struct pt_regs *regs) |
| { |
| if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) { |
| /* |
| * Make sure that the entry code gave us a sensible EFLAGS |
| * register. Native because we want to check the actual CPU |
| * state, not the interrupt state as imagined by Xen. |
| */ |
| unsigned long flags = native_save_fl(); |
| WARN_ON_ONCE(flags & (X86_EFLAGS_AC | X86_EFLAGS_DF | |
| X86_EFLAGS_NT)); |
| |
| /* We think we came from user mode. Make sure pt_regs agrees. */ |
| WARN_ON_ONCE(!user_mode(regs)); |
| |
| /* |
| * All entries from user mode (except #DF) should be on the |
| * normal thread stack and should have user pt_regs in the |
| * correct location. |
| */ |
| WARN_ON_ONCE(!on_thread_stack()); |
| WARN_ON_ONCE(regs != task_pt_regs(current)); |
| } |
| } |
| #define arch_check_user_regs arch_check_user_regs |
| |
| #endif |
