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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, ®s->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
19/* This is used purely for kernel/trace/trace_syscalls.c */
20typedef long (*sys_call_ptr_t)(const struct pt_regs *);
21extern const sys_call_ptr_t sys_call_table[];
22
23/*
24 * These may not exist, but still put the prototypes in so we
25 * can use IS_ENABLED().
26 */
27extern long ia32_sys_call(const struct pt_regs *, unsigned int nr);
28extern long x32_sys_call(const struct pt_regs *, unsigned int nr);
29extern long x64_sys_call(const struct pt_regs *, unsigned int nr);
30
31/*
32 * Only the low 32 bits of orig_ax are meaningful, so we return int.
33 * This importantly ignores the high bits on 64-bit, so comparisons
34 * sign-extend the low 32 bits.
35 */
36static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
37{
38 return regs->orig_ax;
39}
40
41static inline void syscall_rollback(struct task_struct *task,
42 struct pt_regs *regs)
43{
44 regs->ax = regs->orig_ax;
45}
46
47static inline long syscall_get_error(struct task_struct *task,
48 struct pt_regs *regs)
49{
50 unsigned long error = regs->ax;
51#ifdef CONFIG_IA32_EMULATION
52 /*
53 * TS_COMPAT is set for 32-bit syscall entries and then
54 * remains set until we return to user mode.
55 */
56 if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
57 /*
58 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
59 * and will match correctly in comparisons.
60 */
61 error = (long) (int) error;
62#endif
63 return IS_ERR_VALUE(error) ? error : 0;
64}
65
66static inline long syscall_get_return_value(struct task_struct *task,
67 struct pt_regs *regs)
68{
69 return regs->ax;
70}
71
72static inline void syscall_set_return_value(struct task_struct *task,
73 struct pt_regs *regs,
74 int error, long val)
75{
76 regs->ax = (long) error ?: val;
77}
78
79#ifdef CONFIG_X86_32
80
81static inline void syscall_get_arguments(struct task_struct *task,
82 struct pt_regs *regs,
83 unsigned long *args)
84{
85 memcpy(args, ®s->bx, 6 * sizeof(args[0]));
86}
87
88static inline int syscall_get_arch(struct task_struct *task)
89{
90 return AUDIT_ARCH_I386;
91}
92
93#else /* CONFIG_X86_64 */
94
95static inline void syscall_get_arguments(struct task_struct *task,
96 struct pt_regs *regs,
97 unsigned long *args)
98{
99# ifdef CONFIG_IA32_EMULATION
100 if (task->thread_info.status & TS_COMPAT) {
101 *args++ = regs->bx;
102 *args++ = regs->cx;
103 *args++ = regs->dx;
104 *args++ = regs->si;
105 *args++ = regs->di;
106 *args = regs->bp;
107 } else
108# endif
109 {
110 *args++ = regs->di;
111 *args++ = regs->si;
112 *args++ = regs->dx;
113 *args++ = regs->r10;
114 *args++ = regs->r8;
115 *args = regs->r9;
116 }
117}
118
119static inline int syscall_get_arch(struct task_struct *task)
120{
121 /* x32 tasks should be considered AUDIT_ARCH_X86_64. */
122 return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
123 task->thread_info.status & TS_COMPAT)
124 ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
125}
126
127bool do_syscall_64(struct pt_regs *regs, int nr);
128void do_int80_emulation(struct pt_regs *regs);
129
130#endif /* CONFIG_X86_32 */
131
132void do_int80_syscall_32(struct pt_regs *regs);
133bool do_fast_syscall_32(struct pt_regs *regs);
134bool do_SYSENTER_32(struct pt_regs *regs);
135
136#endif /* _ASM_X86_SYSCALL_H */