LXR linux/arch/sparc/include/asm/syscall.h

   1#ifndef __ASM_SPARC_SYSCALL_H
   2#define __ASM_SPARC_SYSCALL_H
   3
   4#include <uapi/linux/audit.h>
   5#include <linux/kernel.h>
   6#include <linux/compat.h>
   7#include <linux/sched.h>
   8#include <asm/ptrace.h>
   9#include <asm/thread_info.h>
  10
  11/*
  12 * The syscall table always contains 32 bit pointers since we know that the
  13 * address of the function to be called is (way) below 4GB.  So the "int"
  14 * type here is what we want [need] for both 32 bit and 64 bit systems.
  15 */
  16extern const unsigned int sys_call_table[];
  17
  18/* The system call number is given by the user in %g1 */
  19static inline long syscall_get_nr(struct task_struct *task,
  20                                  struct pt_regs *regs)
  21{
  22        int syscall_p = pt_regs_is_syscall(regs);
  23
  24        return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
  25}
  26
  27static inline void syscall_rollback(struct task_struct *task,
  28                                    struct pt_regs *regs)
  29{
  30        /* XXX This needs some thought.  On Sparc we don't
  31         * XXX save away the original %o0 value somewhere.
  32         * XXX Instead we hold it in register %l5 at the top
  33         * XXX level trap frame and pass this down to the signal
  34         * XXX dispatch code which is the only place that value
  35         * XXX ever was needed.
  36         */
  37}
  38
  39#ifdef CONFIG_SPARC32
  40static inline bool syscall_has_error(struct pt_regs *regs)
  41{
  42        return (regs->psr & PSR_C) ? true : false;
  43}
  44static inline void syscall_set_error(struct pt_regs *regs)
  45{
  46        regs->psr |= PSR_C;
  47}
  48static inline void syscall_clear_error(struct pt_regs *regs)
  49{
  50        regs->psr &= ~PSR_C;
  51}
  52#else
  53static inline bool syscall_has_error(struct pt_regs *regs)
  54{
  55        return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
  56}
  57static inline void syscall_set_error(struct pt_regs *regs)
  58{
  59        regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
  60}
  61static inline void syscall_clear_error(struct pt_regs *regs)
  62{
  63        regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
  64}
  65#endif
  66
  67static inline long syscall_get_error(struct task_struct *task,
  68                                     struct pt_regs *regs)
  69{
  70        long val = regs->u_regs[UREG_I0];
  71
  72        return (syscall_has_error(regs) ? -val : 0);
  73}
  74
  75static inline long syscall_get_return_value(struct task_struct *task,
  76                                            struct pt_regs *regs)
  77{
  78        long val = regs->u_regs[UREG_I0];
  79
  80        return val;
  81}
  82
  83static inline void syscall_set_return_value(struct task_struct *task,
  84                                            struct pt_regs *regs,
  85                                            int error, long val)
  86{
  87        if (error) {
  88                syscall_set_error(regs);
  89                regs->u_regs[UREG_I0] = -error;
  90        } else {
  91                syscall_clear_error(regs);
  92                regs->u_regs[UREG_I0] = val;
  93        }
  94}
  95
  96static inline void syscall_get_arguments(struct task_struct *task,
  97                                         struct pt_regs *regs,
  98                                         unsigned int i, unsigned int n,
  99                                         unsigned long *args)
 100{
 101        int zero_extend = 0;
 102        unsigned int j;
 103
 104#ifdef CONFIG_SPARC64
 105        if (test_tsk_thread_flag(task, TIF_32BIT))
 106                zero_extend = 1;
 107#endif
 108
 109        for (j = 0; j < n; j++) {
 110                unsigned long val = regs->u_regs[UREG_I0 + i + j];
 111
 112                if (zero_extend)
 113                        args[j] = (u32) val;
 114                else
 115                        args[j] = val;
 116        }
 117}
 118
 119static inline void syscall_set_arguments(struct task_struct *task,
 120                                         struct pt_regs *regs,
 121                                         unsigned int i, unsigned int n,
 122                                         const unsigned long *args)
 123{
 124        unsigned int j;
 125
 126        for (j = 0; j < n; j++)
 127                regs->u_regs[UREG_I0 + i + j] = args[j];
 128}
 129
 130static inline int syscall_get_arch(void)
 131{
 132#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
 133        return in_compat_syscall() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
 134#elif defined(CONFIG_SPARC64)
 135        return AUDIT_ARCH_SPARC64;
 136#else
 137        return AUDIT_ARCH_SPARC;
 138#endif
 139}
 140
 141#endif /* __ASM_SPARC_SYSCALL_H */
 142