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[V4,09/15] x86/ptrace: Provide pt_regs helper for entry/exit

Message ID 20200721110809.215553545@linutronix.de (mailing list archive)
State New, archived
Headers show
Series entry, x86, kvm: Generic entry/exit functionality for host and guest | expand

Commit Message

Thomas Gleixner July 21, 2020, 10:57 a.m. UTC 
From: Thomas Gleixner <tglx@linutronix.de>

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>
---
V4: Remove the syscall nr and return value helpers as they alredy exist
---
 arch/x86/include/asm/ptrace.h |    5 +++++
 1 file changed, 5 insertions(+)
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Patch

--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -209,6 +209,11 @@  static inline void user_stack_pointer_se
 	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);