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Commit bf2c9f98 authored by Wade Farnsworth's avatar Wade Farnsworth Committed by Russell King
Browse files

ARM: 7373/1: add support for the generic syscall.h interface 



Supplying the asm-generic/syscall.h interface is a
pre-requisite for HAVE_ARCH_TRACEHOOK

Signed-off-by: default avatarSteven Walter <stevenrwalter@gmail.com>
Signed-off-by: default avatarWade Farnsworth <wade_farnsworth@mentor.com>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 58834eec

arch/arm/include/asm/syscall.h

0 → 100644
+93 −0
Original line number Diff line number Diff line 
/*

 * Access to user system call parameters and results

 *

 * See asm-generic/syscall.h for descriptions of what we must do here.

 */



#ifndef _ASM_ARM_SYSCALL_H

#define _ASM_ARM_SYSCALL_H



#include <linux/err.h>



extern const unsigned long sys_call_table[];



static inline int syscall_get_nr(struct task_struct *task,

				 struct pt_regs *regs)

{

	return task_thread_info(task)->syscall;

}



static inline void syscall_rollback(struct task_struct *task,

				    struct pt_regs *regs)

{

	regs->ARM_r0 = regs->ARM_ORIG_r0;

}



static inline long syscall_get_error(struct task_struct *task,

				     struct pt_regs *regs)

{

	unsigned long error = regs->ARM_r0;

	return IS_ERR_VALUE(error) ? error : 0;

}



static inline long syscall_get_return_value(struct task_struct *task,

					    struct pt_regs *regs)

{

	return regs->ARM_r0;

}



static inline void syscall_set_return_value(struct task_struct *task,

					    struct pt_regs *regs,

					    int error, long val)

{

	regs->ARM_r0 = (long) error ? error : val;

}



#define SYSCALL_MAX_ARGS 7



static inline void syscall_get_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 unsigned long *args)

{

	if (i + n > SYSCALL_MAX_ARGS) {

		unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;

		unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;

		pr_warning("%s called with max args %d, handling only %d\n",

			   __func__, i + n, SYSCALL_MAX_ARGS);

		memset(args_bad, 0, n_bad * sizeof(args[0]));

		n = SYSCALL_MAX_ARGS - i;

	}



	if (i == 0) {

		args[0] = regs->ARM_ORIG_r0;

		args++;

		i++;

		n--;

	}



	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));

}



static inline void syscall_set_arguments(struct task_struct *task,

					 struct pt_regs *regs,

					 unsigned int i, unsigned int n,

					 const unsigned long *args)

{

	if (i + n > SYSCALL_MAX_ARGS) {

		pr_warning("%s called with max args %d, handling only %d\n",

			   __func__, i + n, SYSCALL_MAX_ARGS);

		n = SYSCALL_MAX_ARGS - i;

	}



	if (i == 0) {

		regs->ARM_ORIG_r0 = args[0];

		args++;

		i++;

		n--;

	}



	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));

}



#endif /* _ASM_ARM_SYSCALL_H */