100 lines
2 KiB
C
100 lines
2 KiB
C
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#ifndef __ASM_MICROBLAZE_SYSCALL_H
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#define __ASM_MICROBLAZE_SYSCALL_H
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/ptrace.h>
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/* The system call number is given by the user in R12 */
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r12;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* TODO. */
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r3;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error)
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regs->r3 = -error;
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else
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regs->r3 = val;
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}
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static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
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unsigned int n)
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{
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switch (n) {
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case 5: return regs->r10;
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case 4: return regs->r9;
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case 3: return regs->r8;
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case 2: return regs->r7;
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case 1: return regs->r6;
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case 0: return regs->r5;
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default:
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BUG();
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}
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return ~0;
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}
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static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
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unsigned int n,
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unsigned long val)
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{
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switch (n) {
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case 5:
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regs->r10 = val;
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case 4:
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regs->r9 = val;
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case 3:
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regs->r8 = val;
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case 2:
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regs->r7 = val;
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case 1:
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regs->r6 = val;
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case 0:
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regs->r5 = val;
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default:
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BUG();
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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while (n--)
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*args++ = microblaze_get_syscall_arg(regs, i++);
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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while (n--)
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microblaze_set_syscall_arg(regs, i++, *args++);
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}
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#endif /* __ASM_MICROBLAZE_SYSCALL_H */
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