1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Access to user system call parameters and results
  4 *
  5 * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
  6 *
  7 * See asm-generic/syscall.h for descriptions of what we must do here.
  8 */
  9
 10#ifndef _ASM_X86_SYSCALL_H
 11#define _ASM_X86_SYSCALL_H
 12
 13#include <uapi/linux/audit.h>
 14#include <linux/sched.h>
 15#include <linux/err.h>
 16#include <asm/thread_info.h>	/* for TS_COMPAT */
 17#include <asm/unistd.h>
 18
 19typedef long (*sys_call_ptr_t)(const struct pt_regs *);
 20extern const sys_call_ptr_t sys_call_table[];
 21
 22#if defined(CONFIG_X86_32)
 23#define ia32_sys_call_table sys_call_table
 24#else
 25/*
 26 * These may not exist, but still put the prototypes in so we
 27 * can use IS_ENABLED().
 28 */
 29extern const sys_call_ptr_t ia32_sys_call_table[];
 30extern const sys_call_ptr_t x32_sys_call_table[];
 31#endif
 32
 33/*
 34 * Only the low 32 bits of orig_ax are meaningful, so we return int.
 35 * This importantly ignores the high bits on 64-bit, so comparisons
 36 * sign-extend the low 32 bits.
 37 */
 38static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 39{
 40	return regs->orig_ax;
 41}
 42
 43static inline void syscall_rollback(struct task_struct *task,
 44				    struct pt_regs *regs)
 45{
 46	regs->ax = regs->orig_ax;
 47}
 48
 49static inline long syscall_get_error(struct task_struct *task,
 50				     struct pt_regs *regs)
 51{
 52	unsigned long error = regs->ax;
 53#ifdef CONFIG_IA32_EMULATION
 54	/*
 55	 * TS_COMPAT is set for 32-bit syscall entries and then
 56	 * remains set until we return to user mode.
 57	 */
 58	if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
 59		/*
 60		 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
 61		 * and will match correctly in comparisons.
 62		 */
 63		error = (long) (int) error;
 64#endif
 65	return IS_ERR_VALUE(error) ? error : 0;
 66}
 67
 68static inline long syscall_get_return_value(struct task_struct *task,
 69					    struct pt_regs *regs)
 70{
 71	return regs->ax;
 72}
 73
 74static inline void syscall_set_return_value(struct task_struct *task,
 75					    struct pt_regs *regs,
 76					    int error, long val)
 77{
 78	regs->ax = (long) error ?: val;
 79}
 80
 81#ifdef CONFIG_X86_32
 82
 83static inline void syscall_get_arguments(struct task_struct *task,
 84					 struct pt_regs *regs,
 85					 unsigned long *args)
 86{
 87	memcpy(args, &regs->bx, 6 * sizeof(args[0]));
 88}
 89
 90static inline int syscall_get_arch(struct task_struct *task)
 91{
 92	return AUDIT_ARCH_I386;
 93}
 94
 95#else	 /* CONFIG_X86_64 */
 96
 97static inline void syscall_get_arguments(struct task_struct *task,
 98					 struct pt_regs *regs,
 99					 unsigned long *args)
100{
101# ifdef CONFIG_IA32_EMULATION
102	if (task->thread_info.status & TS_COMPAT) {
103		*args++ = regs->bx;
104		*args++ = regs->cx;
105		*args++ = regs->dx;
106		*args++ = regs->si;
107		*args++ = regs->di;
108		*args   = regs->bp;
109	} else
110# endif
111	{
112		*args++ = regs->di;
113		*args++ = regs->si;
114		*args++ = regs->dx;
115		*args++ = regs->r10;
116		*args++ = regs->r8;
117		*args   = regs->r9;
118	}
119}
120
121static inline int syscall_get_arch(struct task_struct *task)
122{
123	/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
124	return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
125		task->thread_info.status & TS_COMPAT)
126		? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
127}
128
129void do_syscall_64(struct pt_regs *regs, int nr);
130void do_int80_syscall_32(struct pt_regs *regs);
131long do_fast_syscall_32(struct pt_regs *regs);
132
133#endif	/* CONFIG_X86_32 */
 
 
 
 
134
135#endif	/* _ASM_X86_SYSCALL_H */

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Access to user system call parameters and results
  4 *
  5 * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
  6 *
  7 * See asm-generic/syscall.h for descriptions of what we must do here.
  8 */
  9
 10#ifndef _ASM_X86_SYSCALL_H
 11#define _ASM_X86_SYSCALL_H
 12
 13#include <uapi/linux/audit.h>
 14#include <linux/sched.h>
 15#include <linux/err.h>
 16#include <asm/thread_info.h>	/* for TS_COMPAT */
 17#include <asm/unistd.h>
 18
 19typedef long (*sys_call_ptr_t)(const struct pt_regs *);
 20extern const sys_call_ptr_t sys_call_table[];
 21
 22#if defined(CONFIG_X86_32)
 23#define ia32_sys_call_table sys_call_table
 24#else
 25/*
 26 * These may not exist, but still put the prototypes in so we
 27 * can use IS_ENABLED().
 28 */
 29extern const sys_call_ptr_t ia32_sys_call_table[];
 30extern const sys_call_ptr_t x32_sys_call_table[];
 31#endif
 32
 33/*
 34 * Only the low 32 bits of orig_ax are meaningful, so we return int.
 35 * This importantly ignores the high bits on 64-bit, so comparisons
 36 * sign-extend the low 32 bits.
 37 */
 38static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 39{
 40	return regs->orig_ax;
 41}
 42
 43static inline void syscall_rollback(struct task_struct *task,
 44				    struct pt_regs *regs)
 45{
 46	regs->ax = regs->orig_ax;
 47}
 48
 49static inline long syscall_get_error(struct task_struct *task,
 50				     struct pt_regs *regs)
 51{
 52	unsigned long error = regs->ax;
 53#ifdef CONFIG_IA32_EMULATION
 54	/*
 55	 * TS_COMPAT is set for 32-bit syscall entries and then
 56	 * remains set until we return to user mode.
 57	 */
 58	if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
 59		/*
 60		 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
 61		 * and will match correctly in comparisons.
 62		 */
 63		error = (long) (int) error;
 64#endif
 65	return IS_ERR_VALUE(error) ? error : 0;
 66}
 67
 68static inline long syscall_get_return_value(struct task_struct *task,
 69					    struct pt_regs *regs)
 70{
 71	return regs->ax;
 72}
 73
 74static inline void syscall_set_return_value(struct task_struct *task,
 75					    struct pt_regs *regs,
 76					    int error, long val)
 77{
 78	regs->ax = (long) error ?: val;
 79}
 80
 81#ifdef CONFIG_X86_32
 82
 83static inline void syscall_get_arguments(struct task_struct *task,
 84					 struct pt_regs *regs,
 85					 unsigned long *args)
 86{
 87	memcpy(args, &regs->bx, 6 * sizeof(args[0]));
 88}
 89
 90static inline int syscall_get_arch(struct task_struct *task)
 91{
 92	return AUDIT_ARCH_I386;
 93}
 94
 95#else	 /* CONFIG_X86_64 */
 96
 97static inline void syscall_get_arguments(struct task_struct *task,
 98					 struct pt_regs *regs,
 99					 unsigned long *args)
100{
101# ifdef CONFIG_IA32_EMULATION
102	if (task->thread_info.status & TS_COMPAT) {
103		*args++ = regs->bx;
104		*args++ = regs->cx;
105		*args++ = regs->dx;
106		*args++ = regs->si;
107		*args++ = regs->di;
108		*args   = regs->bp;
109	} else
110# endif
111	{
112		*args++ = regs->di;
113		*args++ = regs->si;
114		*args++ = regs->dx;
115		*args++ = regs->r10;
116		*args++ = regs->r8;
117		*args   = regs->r9;
118	}
119}
120
121static inline int syscall_get_arch(struct task_struct *task)
122{
123	/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
124	return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
125		task->thread_info.status & TS_COMPAT)
126		? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
127}
128
129bool do_syscall_64(struct pt_regs *regs, int nr);
 
 
130
131#endif	/* CONFIG_X86_32 */
132
133void do_int80_syscall_32(struct pt_regs *regs);
134bool do_fast_syscall_32(struct pt_regs *regs);
135bool do_SYSENTER_32(struct pt_regs *regs);
136
137#endif	/* _ASM_X86_SYSCALL_H */