mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
2978996f62
System call numbers are defined as int, so use int everywhere for system call numbers. This is strictly a cleanup; it should not change anything user visible; all ABI changes have been done in the preceeding patches. [ tglx: Replaced the unsigned long cast ] Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210518191303.4135296-7-hpa@zytor.com
168 lines
4 KiB
C
168 lines
4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Access to user system call parameters and results
|
|
*
|
|
* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* See asm-generic/syscall.h for descriptions of what we must do here.
|
|
*/
|
|
|
|
#ifndef _ASM_X86_SYSCALL_H
|
|
#define _ASM_X86_SYSCALL_H
|
|
|
|
#include <uapi/linux/audit.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/err.h>
|
|
#include <asm/thread_info.h> /* for TS_COMPAT */
|
|
#include <asm/unistd.h>
|
|
|
|
typedef long (*sys_call_ptr_t)(const struct pt_regs *);
|
|
extern const sys_call_ptr_t sys_call_table[];
|
|
|
|
#if defined(CONFIG_X86_32)
|
|
#define ia32_sys_call_table sys_call_table
|
|
#else
|
|
/*
|
|
* These may not exist, but still put the prototypes in so we
|
|
* can use IS_ENABLED().
|
|
*/
|
|
extern const sys_call_ptr_t ia32_sys_call_table[];
|
|
extern const sys_call_ptr_t x32_sys_call_table[];
|
|
#endif
|
|
|
|
/*
|
|
* Only the low 32 bits of orig_ax are meaningful, so we return int.
|
|
* This importantly ignores the high bits on 64-bit, so comparisons
|
|
* sign-extend the low 32 bits.
|
|
*/
|
|
static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return regs->orig_ax;
|
|
}
|
|
|
|
static inline void syscall_rollback(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
regs->ax = regs->orig_ax;
|
|
}
|
|
|
|
static inline long syscall_get_error(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long error = regs->ax;
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
/*
|
|
* TS_COMPAT is set for 32-bit syscall entries and then
|
|
* remains set until we return to user mode.
|
|
*/
|
|
if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
|
|
/*
|
|
* Sign-extend the value so (int)-EFOO becomes (long)-EFOO
|
|
* and will match correctly in comparisons.
|
|
*/
|
|
error = (long) (int) error;
|
|
#endif
|
|
return IS_ERR_VALUE(error) ? error : 0;
|
|
}
|
|
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->ax;
|
|
}
|
|
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
int error, long val)
|
|
{
|
|
regs->ax = (long) error ?: val;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned long *args)
|
|
{
|
|
memcpy(args, ®s->bx, 6 * 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)
|
|
{
|
|
BUG_ON(i + n > 6);
|
|
memcpy(®s->bx + i, args, n * sizeof(args[0]));
|
|
}
|
|
|
|
static inline int syscall_get_arch(struct task_struct *task)
|
|
{
|
|
return AUDIT_ARCH_I386;
|
|
}
|
|
|
|
#else /* CONFIG_X86_64 */
|
|
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned long *args)
|
|
{
|
|
# ifdef CONFIG_IA32_EMULATION
|
|
if (task->thread_info.status & TS_COMPAT) {
|
|
*args++ = regs->bx;
|
|
*args++ = regs->cx;
|
|
*args++ = regs->dx;
|
|
*args++ = regs->si;
|
|
*args++ = regs->di;
|
|
*args = regs->bp;
|
|
} else
|
|
# endif
|
|
{
|
|
*args++ = regs->di;
|
|
*args++ = regs->si;
|
|
*args++ = regs->dx;
|
|
*args++ = regs->r10;
|
|
*args++ = regs->r8;
|
|
*args = regs->r9;
|
|
}
|
|
}
|
|
|
|
static inline void syscall_set_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
const unsigned long *args)
|
|
{
|
|
# ifdef CONFIG_IA32_EMULATION
|
|
if (task->thread_info.status & TS_COMPAT) {
|
|
regs->bx = *args++;
|
|
regs->cx = *args++;
|
|
regs->dx = *args++;
|
|
regs->si = *args++;
|
|
regs->di = *args++;
|
|
regs->bp = *args;
|
|
} else
|
|
# endif
|
|
{
|
|
regs->di = *args++;
|
|
regs->si = *args++;
|
|
regs->dx = *args++;
|
|
regs->r10 = *args++;
|
|
regs->r8 = *args++;
|
|
regs->r9 = *args;
|
|
}
|
|
}
|
|
|
|
static inline int syscall_get_arch(struct task_struct *task)
|
|
{
|
|
/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
|
|
return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
|
|
task->thread_info.status & TS_COMPAT)
|
|
? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
|
|
}
|
|
|
|
void do_syscall_64(struct pt_regs *regs, int nr);
|
|
void do_int80_syscall_32(struct pt_regs *regs);
|
|
long do_fast_syscall_32(struct pt_regs *regs);
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
#endif /* _ASM_X86_SYSCALL_H */
|