97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
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#ifndef __ASM_SH_SYSCALL_32_H
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#define __ASM_SH_SYSCALL_32_H
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <asm/ptrace.h>
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/* The system call number is given by the user in R3 */
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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->tra >= 0) ? regs->regs[3] : -1L;
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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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/*
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* XXX: This needs some thought. On SH we don't
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* save away the original r0 value anywhere.
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*/
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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->regs[0]) ? regs->regs[0] : 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->regs[0];
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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->regs[0] = -error;
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else
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regs->regs[0] = val;
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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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/*
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* Do this simply for now. If we need to start supporting
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* fetching arguments from arbitrary indices, this will need some
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* extra logic. Presently there are no in-tree users that depend
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* on this behaviour.
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*/
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BUG_ON(i);
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/* Argument pattern is: R4, R5, R6, R7, R0, R1 */
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switch (n) {
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case 6: args[5] = regs->regs[1];
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case 5: args[4] = regs->regs[0];
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case 4: args[3] = regs->regs[7];
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case 3: args[2] = regs->regs[6];
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case 2: args[1] = regs->regs[5];
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case 1: args[0] = regs->regs[4];
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case 0:
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break;
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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_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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/* Same note as above applies */
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BUG_ON(i);
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switch (n) {
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case 6: regs->regs[1] = args[5];
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case 5: regs->regs[0] = args[4];
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case 4: regs->regs[7] = args[3];
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case 3: regs->regs[6] = args[2];
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case 2: regs->regs[5] = args[1];
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case 1: regs->regs[4] = args[0];
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break;
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default:
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BUG();
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}
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}
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#endif /* __ASM_SH_SYSCALL_32_H */
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