As a preparatory step for moving the syscall and interrupt entry/exit
handling into generic code, provide pt_regs helpers which allow to:
- Retrieve the syscall number from pt_regs
- Retrieve the syscall return value from pt_regs
- Retrieve the interrupt state from pt_regs to check whether interrupts
are reenabled by return from interrupt/exception.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/include/asm/ptrace.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -209,6 +209,21 @@ static inline void user_stack_pointer_se
regs->sp = val;
}
+static inline unsigned long regs_syscall_nr(struct pt_regs *regs)
+{
+ return regs->orig_ax;
+}
+
+static inline long regs_syscall_retval(struct pt_regs *regs)
+{
+ return regs->ax;
+}
+
+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);
