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bf2c9f9866
Supplying the asm-generic/syscall.h interface is a pre-requisite for HAVE_ARCH_TRACEHOOK Signed-off-by: Steven Walter <stevenrwalter@gmail.com> Signed-off-by: Wade Farnsworth <wade_farnsworth@mentor.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
/*
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* Access to user system call parameters and results
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_ARM_SYSCALL_H
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#define _ASM_ARM_SYSCALL_H
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#include <linux/err.h>
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extern const unsigned long sys_call_table[];
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static inline int syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return task_thread_info(task)->syscall;
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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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regs->ARM_r0 = regs->ARM_ORIG_r0;
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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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unsigned long error = regs->ARM_r0;
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return IS_ERR_VALUE(error) ? error : 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->ARM_r0;
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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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regs->ARM_r0 = (long) error ? error : val;
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}
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#define SYSCALL_MAX_ARGS 7
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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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if (i + n > SYSCALL_MAX_ARGS) {
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unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
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unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
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pr_warning("%s called with max args %d, handling only %d\n",
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__func__, i + n, SYSCALL_MAX_ARGS);
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memset(args_bad, 0, n_bad * sizeof(args[0]));
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n = SYSCALL_MAX_ARGS - i;
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}
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if (i == 0) {
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args[0] = regs->ARM_ORIG_r0;
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args++;
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i++;
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n--;
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}
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memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0]));
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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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if (i + n > SYSCALL_MAX_ARGS) {
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pr_warning("%s called with max args %d, handling only %d\n",
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__func__, i + n, SYSCALL_MAX_ARGS);
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n = SYSCALL_MAX_ARGS - i;
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}
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if (i == 0) {
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regs->ARM_ORIG_r0 = args[0];
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args++;
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i++;
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n--;
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}
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memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0]));
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}
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#endif /* _ASM_ARM_SYSCALL_H */
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