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sparc: Add asm/syscall.h 

Based upon a patch by Roland McGrath.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-07-27 00:53:10 -07:00
parent 73ccefab8a
commit badcbf0e86
1 changed files with 120 additions and 0 deletions
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120
arch/sparc/include/asm/syscall.h Normal file
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#ifndef __ASM_SPARC_SYSCALL_H
#define __ASM_SPARC_SYSCALL_H
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
/* The system call number is given by the user in %g1 */
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
int syscall_p = pt_regs_is_syscall(regs);
return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
/* XXX This needs some thought. On Sparc we don't
* XXX save away the original %o0 value somewhere.
* XXX Instead we hold it in register %l5 at the top
* XXX level trap frame and pass this down to the signal
* XXX dispatch code which is the only place that value
* XXX ever was needed.
*/
}
#ifdef CONFIG_SPARC32
static inline bool syscall_has_error(struct pt_regs *regs)
{
return (regs->psr & PSR_C) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
regs->psr |= PSR_C;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
regs->psr &= ~PSR_C;
}
#else
static inline bool syscall_has_error(struct pt_regs *regs)
{
return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
}
#endif
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
long val = regs->u_regs[UREG_I0];
return (syscall_has_error(regs) ? -val : 0);
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
long val = regs->u_regs[UREG_I0];
return val;
}
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->u_regs[UREG_I0] = -error;
} else {
syscall_clear_error(regs);
regs->u_regs[UREG_I0] = val;
}
}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
int zero_extend = 0;
unsigned int j;
#ifdef CONFIG_SPARC64
if (test_tsk_thread_flag(task, TIF_32BIT))
zero_extend = 1;
#endif
for (j = 0; j < n; j++) {
unsigned long val = regs->u_regs[UREG_I0 + i + j];
if (zero_extend)
args[j] = (u32) val;
else
args[j] = val;
}
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
const unsigned long *args)
{
unsigned int j;
for (j = 0; j < n; j++)
regs->u_regs[UREG_I0 + i + j] = args[j];
}
#endif /* __ASM_SPARC_SYSCALL_H */