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

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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>
This commit is contained in:
Wade Farnsworth 2012-04-04 16:19:02 +01:00 committed by Russell King
parent 58834eecde
commit bf2c9f9866
1 changed files with 93 additions and 0 deletions
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93
arch/arm/include/asm/syscall.h Normal file
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/*
* 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 */