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x86/ptrace: Provide pt_regs helper for entry/exit

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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
This commit is contained in:
Thomas Gleixner 2020-07-23 00:00:03 +02:00
parent a377ac1cd9
commit 0bf019ea59
1 changed files with 5 additions and 0 deletions
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arch/x86/include/asm/ptrace.h
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@ -209,6 +209,11 @@ static inline void user_stack_pointer_set(struct pt_regs *regs,
regs->sp = val; 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 */ /* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name); extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset); extern const char *regs_query_register_name(unsigned int offset);