sh: Provide asm/syscall.h for SH-5. (94e2fb3d) · Commits · 戴 / test

arch/sh/include/asm/syscall_64.h

+75 −1

Original line number	Diff line number	Diff line
		#ifndef __ASM_SH_SYSCALL_64_H
		#define __ASM_SH_SYSCALL_64_H

		#include <asm-generic/syscall.h>
		#include <linux/kernel.h>
		#include <linux/sched.h>
		#include <asm/ptrace.h>

		/* The system call number is given by the user in R9 */
		static inline long syscall_get_nr(struct task_struct *task,
		struct pt_regs *regs)
		{
		return (regs->syscall_nr >= 0) ? regs->regs[9] : -1L;
		}

		static inline void syscall_rollback(struct task_struct *task,
		struct pt_regs *regs)
		{
		/*
		* XXX: This needs some thought. On SH we don't
		* save away the original R9 value anywhere.
		*/
		}

		static inline bool syscall_has_error(struct pt_regs *regs)
		{
		return (regs->sr & 0x1) ? true : false;
		}
		static inline void syscall_set_error(struct pt_regs *regs)
		{
		regs->sr \|= 0x1;
		}
		static inline void syscall_clear_error(struct pt_regs *regs)
		{
		regs->sr &= ~0x1;
		}

		static inline long syscall_get_error(struct task_struct *task,
		struct pt_regs *regs)
		{
		return syscall_has_error(regs) ? regs->regs[9] : 0;
		}

		static inline long syscall_get_return_value(struct task_struct *task,
		struct pt_regs *regs)
		{
		return regs->regs[9];
		}

		static inline void syscall_set_return_value(struct task_struct *task,
		struct pt_regs *regs,
		int error, long val)
		{
		if (error) {
		syscall_set_error(regs);
		regs->regs[9] = -error;
		} else {
		syscall_clear_error(regs);
		regs->regs[9] = val;
		}
		}

		static inline void syscall_get_arguments(struct task_struct *task,
		struct pt_regs *regs,
		unsigned int i, unsigned int n,
		unsigned long *args)
		{
		BUG_ON(i + n > 6);
		memcpy(args, &regs->reg[2 + i], n * sizeof(args[0]));
		}

		static inline void syscall_set_arguments(struct task_struct *task,
		struct pt_regs *regs,
		unsigned int i, unsigned int n,
		const unsigned long *args)
		{
		BUG_ON(i + n > 6);
		memcpy(&regs->reg[2 + i], args, n * sizeof(args[0]));
		}

		#endif /* __ASM_SH_SYSCALL_64_H */

arch/sh/kernel/signal_32.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -533,7 +533,6 @@ handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
		{
		int ret;


		/* Set up the stack frame */
		if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);

arch/sh/kernel/signal_64.c

+33 −30

Original line number	Diff line number	Diff line
		@@ -47,6 +47,34 @@ static int
		handle_signal(unsigned long sig, siginfo_t info, struct k_sigaction ka,
		sigset_t oldset, struct pt_regs regs);

		static inline void
		handle_syscall_restart(struct pt_regs regs, struct sigaction sa)
		{
		/* If we're not from a syscall, bail out */
		if (regs->syscall_nr < 0)
		return;

		/* check for system call restart.. */
		switch (regs->regs[REG_RET]) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
		no_system_call_restart:
		regs->regs[REG_RET] = -EINTR;
		regs->sr \|= 1;
		break;

		case -ERESTARTSYS:
		if (!(sa->sa_flags & SA_RESTART))
		goto no_system_call_restart;
		/* fallthrough */
		case -ERESTARTNOINTR:
		/* Decode syscall # */
		regs->regs[REG_RET] = regs->syscall_nr;
		regs->pc -= 4;
		break;
		}
		}

		/*
		* Note that 'init' is a special process: it doesn't get signals it doesn't
		* want to handle. Thus you cannot kill init even with a SIGKILL even by
		@@ -81,6 +109,9 @@ static int do_signal(struct pt_regs regs, sigset_t oldset)

		signr = get_signal_to_deliver(&info, &ka, regs, 0);
		if (signr > 0) {
		if (regs->sr & 1)
		handle_syscall_restart(regs, &ka.sa);

		/* Whee! Actually deliver the signal. */
		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
		/*
		@@ -128,7 +159,6 @@ no_signal:
		/*
		* Atomically swap in the new signal mask, and wait for a signal.
		*/

		asmlinkage int
		sys_sigsuspend(old_sigset_t mask,
		unsigned long r3, unsigned long r4, unsigned long r5,
		@@ -234,20 +264,16 @@ sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
		return do_sigaltstack(uss, uoss, REF_REG_SP);
		}


		/*
		* Do a signal return; undo the signal stack.
		*/

		struct sigframe
		{
		struct sigframe {
		struct sigcontext sc;
		unsigned long extramask[_NSIG_WORDS-1];
		long long retcode[2];
		};

		struct rt_sigframe
		{
		struct rt_sigframe {
		struct siginfo __user *pinfo;
		void *puc;
		struct siginfo info;
		@@ -449,7 +475,6 @@ badframe:
		/*
		* Set up a signal frame.
		*/

		static int
		setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
		unsigned long mask)
		@@ -714,34 +739,12 @@ give_sigsegv:
		/*
		* OK, we're invoking a handler
		*/

		static int
		handle_signal(unsigned long sig, siginfo_t info, struct k_sigaction ka,
		sigset_t oldset, struct pt_regs regs)
		{
		int ret;

		/* Are we from a system call? */
		if (regs->syscall_nr >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->regs[REG_RET]) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
		no_system_call_restart:
		regs->regs[REG_RET] = -EINTR;
		break;

		case -ERESTARTSYS:
		if (!(ka->sa.sa_flags & SA_RESTART))
		goto no_system_call_restart;
		/* fallthrough */
		case -ERESTARTNOINTR:
		/* Decode syscall # */
		regs->regs[REG_RET] = regs->syscall_nr;
		regs->pc -= 4;
		}
		}

		/* Set up the stack frame */
		if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);

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