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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SPARC_SYSCALL_H
   3#define __ASM_SPARC_SYSCALL_H
   4
   5#include <uapi/linux/audit.h>
   6#include <linux/kernel.h>
   7#include <linux/compat.h>
   8#include <linux/sched.h>
   9#include <asm/ptrace.h>
  10#include <asm/thread_info.h>
  11
  12/*
  13 * The syscall table always contains 32 bit pointers since we know that the
  14 * address of the function to be called is (way) below 4GB.  So the "int"
  15 * type here is what we want [need] for both 32 bit and 64 bit systems.
  16 */
  17extern const unsigned int sys_call_table[];
  18
  19/* The system call number is given by the user in %g1 */
  20static inline long syscall_get_nr(struct task_struct *task,
  21                                  struct pt_regs *regs)
  22{
  23        int syscall_p = pt_regs_is_syscall(regs);
  24
  25        return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
  26}
  27
  28static inline void syscall_rollback(struct task_struct *task,
  29                                    struct pt_regs *regs)
  30{
  31        /* XXX This needs some thought.  On Sparc we don't
  32         * XXX save away the original %o0 value somewhere.
  33         * XXX Instead we hold it in register %l5 at the top
  34         * XXX level trap frame and pass this down to the signal
  35         * XXX dispatch code which is the only place that value
  36         * XXX ever was needed.
  37         */
  38}
  39
  40#ifdef CONFIG_SPARC32
  41static inline bool syscall_has_error(struct pt_regs *regs)
  42{
  43        return (regs->psr & PSR_C) ? true : false;
  44}
  45static inline void syscall_set_error(struct pt_regs *regs)
  46{
  47        regs->psr |= PSR_C;
  48}
  49static inline void syscall_clear_error(struct pt_regs *regs)
  50{
  51        regs->psr &= ~PSR_C;
  52}
  53#else
  54static inline bool syscall_has_error(struct pt_regs *regs)
  55{
  56        return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
  57}
  58static inline void syscall_set_error(struct pt_regs *regs)
  59{
  60        regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
  61}
  62static inline void syscall_clear_error(struct pt_regs *regs)
  63{
  64        regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
  65}
  66#endif
  67
  68static inline long syscall_get_error(struct task_struct *task,
  69                                     struct pt_regs *regs)
  70{
  71        long val = regs->u_regs[UREG_I0];
  72
  73        return (syscall_has_error(regs) ? -val : 0);
  74}
  75
  76static inline long syscall_get_return_value(struct task_struct *task,
  77                                            struct pt_regs *regs)
  78{
  79        long val = regs->u_regs[UREG_I0];
  80
  81        return val;
  82}
  83
  84static inline void syscall_set_return_value(struct task_struct *task,
  85                                            struct pt_regs *regs,
  86                                            int error, long val)
  87{
  88        if (error) {
  89                syscall_set_error(regs);
  90                regs->u_regs[UREG_I0] = -error;
  91        } else {
  92                syscall_clear_error(regs);
  93                regs->u_regs[UREG_I0] = val;
  94        }
  95}
  96
  97static inline void syscall_get_arguments(struct task_struct *task,
  98                                         struct pt_regs *regs,
  99                                         unsigned long *args)
 100{
 101        int zero_extend = 0;
 102        unsigned int j;
 103        unsigned int n = 6;
 104
 105#ifdef CONFIG_SPARC64
 106        if (test_tsk_thread_flag(task, TIF_32BIT))
 107                zero_extend = 1;
 108#endif
 109
 110        for (j = 0; j < n; j++) {
 111                unsigned long val = regs->u_regs[UREG_I0 + j];
 112
 113                if (zero_extend)
 114                        args[j] = (u32) val;
 115                else
 116                        args[j] = val;
 117        }
 118}
 119
 120static inline void syscall_set_arguments(struct task_struct *task,
 121                                         struct pt_regs *regs,
 122                                         const unsigned long *args)
 123{
 124        unsigned int i;
 125
 126        for (i = 0; i < 6; i++)
 127                regs->u_regs[UREG_I0 + i] = args[i];
 128}
 129
 130static inline int syscall_get_arch(struct task_struct *task)
 131{
 132#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
 133        return test_tsk_thread_flag(task, TIF_32BIT)
 134                ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
 135#elif defined(CONFIG_SPARC64)
 136        return AUDIT_ARCH_SPARC64;
 137#else
 138        return AUDIT_ARCH_SPARC;
 139#endif
 140}
 141
 142#endif /* __ASM_SPARC_SYSCALL_H */
 143