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sh: Provide asm/syscall.h for SH-5.

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This provides the asm/syscall.h implementation for sh64 parts.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-12-10 19:46:18 +09:00
parent 6ac034375f
commit 94e2fb3d3e
3 changed files with 108 additions and 32 deletions
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76
arch/sh/include/asm/syscall_64.h
View file

@ -1,6 +1,80 @@
#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 */

1
arch/sh/kernel/signal_32.c
View file

@ -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);

63
arch/sh/kernel/signal_64.c
View file

@ -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 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset)
/*
* 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 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
/*
* Set up a signal frame.
*/
static int
setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
unsigned long mask)
@ -714,34 +739,12 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/*
* 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);