/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_SIGHANDLING_H
#define _ASM_X86_SIGHANDLING_H
#include <linux/compiler.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <asm /processor-flags.h>
#define FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
X86_EFLAGS_CF | X86_EFLAGS_RF)
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
void __user *
get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size,
void __user **fpstate);
int ia32_setup_frame(struct ksignal *ksig, struct pt_regs *regs);
int ia32_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs);
int x64_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs);
int x32_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs);
/*
* To prevent immediate repeat of single step trap on return from SIGTRAP
* handler if the trap flag ( TF ) is set without an external debugger attached ,
* clear the software event flag in the augmented SS , ensuring no single - step
* trap is pending upon ERETU completion .
*
* Note , this function should be called in sigreturn ( ) before the original
* state is restored to make sure the TF is read from the entry frame .
*/
static __always_inline void prevent_single_step_upon_eretu(struct pt_regs *regs)
{
/*
* If the trap flag ( TF ) is set , i . e . , the sigreturn ( ) SYSCALL instruction
* is being single - stepped , do not clear the software event flag in the
* augmented SS , thus a debugger won ' t skip over the following instruction .
*/
#ifdef CONFIG_X86_FRED
if (!(regs->flags & X86_EFLAGS_TF))
regs->fred_ss.swevent = 0 ;
#endif
}
#endif /* _ASM_X86_SIGHANDLING_H */
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