Commit 0bf019ea authored Jul 23, 2020 by Thomas Gleixner

x86/ptrace: Provide pt_regs helper for entry/exit

As a preparatory step for moving the syscall and interrupt entry/exit
handling into generic code, provide a pt_regs helper which retrieves the
interrupt state from pt_regs. This is required to check whether interrupts
are reenabled by return from interrupt/exception.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200722220520.258511584@linutronix.de

parent a377ac1c

arch/x86/include/asm/ptrace.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,11 @@ static inline void user_stack_pointer_set(struct pt_regs *regs,
		regs->sp = val;
		}

		static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
		{
		return !(regs->flags & X86_EFLAGS_IF);
		}

		/* Query offset/name of register from its name/offset */
		extern int regs_query_register_offset(const char *name);
		extern const char *regs_query_register_name(unsigned int offset);