linux-headers/arch/e2k/include/asm/signal.h

#ifndef _E2K_SIGNAL_H_
#define _E2K_SIGNAL_H_

#include <uapi/asm/signal.h>


#undef	DEBUG_SIG_MODE
#undef	DebugSig
#define	DEBUG_SIG_MODE		0	/* Signal handling */
#if DEBUG_SIG_MODE
# define DebugSig printk
#else
# define DebugSig(...)
#endif

#undef	DEBUG_SLJ_MODE
#undef	DebugSLJ
#define	DEBUG_SLJ_MODE		0	/* Signal long jump handling */
#define DebugSLJ(...)		DebugPrint(DEBUG_SLJ_MODE ,##__VA_ARGS__)


#define __ARCH_HAS_SA_RESTORER

/*
 * exc_mem_lock_as can arrive at inside of a critical section since
 * it uses non-maskable interrupts,
 *
 * But in PREEMPT_RT force_sig_info() must be called with
 * enabled preemption because spinlocks are mutexes
 *
 * Fix this by delaying signal sending.
 */
#ifdef CONFIG_PREEMPT_RT
# define ARCH_RT_DELAYS_SIGNAL_SEND
#endif


#define _NSIG		64
#define _NSIG_BPW	64
#define _NSIG_WORDS	(_NSIG / _NSIG_BPW)

#define _NSIG_BPW32	32
#define _NSIG_WORDS32	(_NSIG / _NSIG_BPW32)

#include <asm-generic/signal-defs.h>
#include <asm/e2k_ptypes.h>

#include <asm/siginfo.h>
#include <asm/stacks.h>

# ifndef __ASSEMBLY__

typedef struct {
	e2k_ptr_t ss_sp;
	int ss_flags;
	size_t ss_size;
} stack_prot_t;

/* Most things should be clean enough to redefine this at will, if care
   is taken to make libc match.  */

typedef unsigned long old_sigset_t;

typedef struct {
	unsigned long sig[_NSIG_WORDS];
} sigset_t;

typedef struct prot_sigaction_old {
	e2k_pl_lo_t	sa_handler;
	u64		sa_flags;
	e2k_pl_lo_t	sa_restorer;
	sigset_t	sa_mask;
} prot_sigaction_old_t;

typedef struct prot_sigaction {
	e2k_pl_t	sa_handler;
	u64		sa_flags;
	u64		_unused;
	e2k_pl_t	sa_restorer;
	sigset_t	sa_mask;
} prot_sigaction_t;

#include <asm/sigcontext.h>

struct pt_regs;
struct siginfo;
struct ucontext;
struct as_sa_handler_arg;

#define ptrace_signal_deliver() do { } while (0)


#define	DO_SDBGPRINT(message)						\
do {									\
	e2k_tir_lo_t	tir_lo;						\
	void *cr_ip, *tir_ip;						\
									\
	tir_lo.TIR_lo_reg = (regs)->trap->TIR_lo;			\
									\
	tir_ip = (void *)tir_lo.TIR_lo_ip;				\
	cr_ip = (void *)GET_IP_CR0_HI((regs)->crs.cr0_hi);		\
									\
	if (tir_ip == cr_ip)						\
		pr_info("%s: IP=%px %s(pid=%d)\n",			\
			message, tir_ip, current->comm,			\
			current->pid);					\
	else								\
		pr_info("%s: IP=%px(interrupt IP=%px) %s(pid=%d)\n",	\
			message, tir_ip, cr_ip, current->comm,		\
			current->pid);					\
} while (false)

#define	SDBGPRINT(message)		\
do {					\
	if (debug_signal)		\
		DO_SDBGPRINT(message);	\
} while (0)

#define	SDBGPRINT_WITH_STACK(message)	\
do {					\
	if (debug_signal) {		\
		DO_SDBGPRINT(message);	\
		dump_stack();		\
	}				\
} while (0)

struct signal_stack;
extern unsigned long allocate_signal_stack(unsigned long size);
extern void free_signal_stack(struct signal_stack *signal_stack);
extern struct signal_stack_context __user *
			get_the_signal_stack(struct signal_stack *signal_stack);
extern struct signal_stack_context __user *
			pop_the_signal_stack(struct signal_stack *signal_stack);
extern struct signal_stack_context __user *pop_signal_stack(void);
extern struct signal_stack_context __user *get_signal_stack(void);
extern int setup_signal_stack(struct pt_regs *regs, bool is_signal);

#define	GET_SIG_RESTORE_STACK(ti, sbr, usd_lo, usd_hi) \
do { \
	/* Reserve 64 bytes for kernel per C calling convention */ \
	u64 used_dstack_size = round_up(64, E2K_ALIGN_STACK); \
 \
	sbr = (u64)thread_info_task(ti)->stack + KERNEL_C_STACK_SIZE + \
						 KERNEL_C_STACK_OFFSET; \
	AW(usd_lo) = AW((ti)->k_usd_lo); \
	AW(usd_hi) = AW((ti)->k_usd_hi); \
	AS(usd_lo).base -= used_dstack_size; \
	AS(usd_hi).size -= used_dstack_size; \
} while (false)

/* The topmost dispatcher for any signals.  */
/* Implemented in arch/e2k/kernel/signal.c  */
extern void do_signal(struct pt_regs *);
extern int signal_rt_frame_setup(struct pt_regs *regs);
extern int prepare_sighandler_frame(struct e2k_stacks *stacks,
				u64 pframe[32], e2k_mem_crs_t *crs);

extern int native_signal_setup(struct pt_regs *regs);

extern int native_longjmp_copy_user_to_kernel_hw_stacks(struct pt_regs *regs,
							struct pt_regs *new_regs);

static inline int native_complete_long_jump(struct pt_regs *regs)
{
	/* nithing to do for native kernel & host */
	return 0;
}

extern long do_sigreturn(void);
extern void sighandler_trampoline(void);
extern void sighandler_trampoline_continue(void);

#ifdef CONFIG_SECONDARY_SPACE_SUPPORT
extern long sys_tgkill_info(int pid, int tgid, struct siginfo __user *uinfo);

#define set_delayed_signal_handling(ti) \
do { \
	set_ti_status_flag(ti, TS_DELAYED_SIG_HANDLING); \
} while (0)

#define clear_delayed_signal_handling(ti) \
do { \
	clear_ti_status_flag(ti, TS_DELAYED_SIG_HANDLING); \
} while (0)

#define test_delayed_signal_handling(p, ti) \
	(unlikely(test_ti_status_flag(ti, TS_DELAYED_SIG_HANDLING)) && \
		  !__fatal_signal_pending(p))
#else
#define set_delayed_signal_handling(ti)
#define clear_delayed_signal_handling(ti)
#define test_delayed_signal_handling(p, ti)	(false)
#endif

#ifdef	CONFIG_KVM_GUEST_KERNEL
/* It is native paravirtualized guest kernel */
#include <asm/kvm/guest/signal.h>
#elif	defined(CONFIG_PARAVIRT_GUEST)
/* It is paravirtualized kernel (host and guest) */
#include <asm/paravirt/process.h>
#else	/* !CONFIG_KVM_GUEST_KERNEL && !CONFIG_PARAVIRT_GUEST */
/* native kernel with virtualization support */
/* native kernel without virtualization support */

static inline int signal_setup(struct pt_regs *regs)
{
	return native_signal_setup(regs);
}

static inline int longjmp_copy_user_to_kernel_hw_stacks(struct pt_regs *regs,
							struct pt_regs *new_regs)
{
	return native_longjmp_copy_user_to_kernel_hw_stacks(regs, new_regs);
}

static inline int complete_long_jump(struct pt_regs *regs)
{
	return native_complete_long_jump(regs);
}

#endif	/* CONFIG_KVM_GUEST_KERNEL */


# endif /* __ASSEMBLY__ */

#endif /* _E2K_SIGNAL_H_ */