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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
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#endif
25
26#if defined(CONFIG_IA32_EMULATION)
27extern const sys_call_ptr_t ia32_sys_call_table[];
28#endif
29
30#ifdef CONFIG_X86_X32_ABI
31extern const sys_call_ptr_t x32_sys_call_table[];
32#endif
33
34/*
35 * Only the low 32 bits of orig_ax are meaningful, so we return int.
36 * This importantly ignores the high bits on 64-bit, so comparisons
37 * sign-extend the low 32 bits.
38 */
39static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
40{
41 return regs->orig_ax;
42}
43
44static inline void syscall_rollback(struct task_struct *task,
45 struct pt_regs *regs)
46{
47 regs->ax = regs->orig_ax;
48}
49
50static inline long syscall_get_error(struct task_struct *task,
51 struct pt_regs *regs)
52{
53 unsigned long error = regs->ax;
54#ifdef CONFIG_IA32_EMULATION
55 /*
56 * TS_COMPAT is set for 32-bit syscall entries and then
57 * remains set until we return to user mode.
58 */
59 if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
60 /*
61 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
62 * and will match correctly in comparisons.
63 */
64 error = (long) (int) error;
65#endif
66 return IS_ERR_VALUE(error) ? error : 0;
67}
68
69static inline long syscall_get_return_value(struct task_struct *task,
70 struct pt_regs *regs)
71{
72 return regs->ax;
73}
74
75static inline void syscall_set_return_value(struct task_struct *task,
76 struct pt_regs *regs,
77 int error, long val)
78{
79 regs->ax = (long) error ?: val;
80}
81
82#ifdef CONFIG_X86_32
83
84static inline void syscall_get_arguments(struct task_struct *task,
85 struct pt_regs *regs,
86 unsigned long *args)
87{
88 memcpy(args, ®s->bx, 6 * sizeof(args[0]));
89}
90
91static inline void syscall_set_arguments(struct task_struct *task,
92 struct pt_regs *regs,
93 unsigned int i, unsigned int n,
94 const unsigned long *args)
95{
96 BUG_ON(i + n > 6);
97 memcpy(®s->bx + i, args, n * sizeof(args[0]));
98}
99
100static inline int syscall_get_arch(struct task_struct *task)
101{
102 return AUDIT_ARCH_I386;
103}
104
105#else /* CONFIG_X86_64 */
106
107static inline void syscall_get_arguments(struct task_struct *task,
108 struct pt_regs *regs,
109 unsigned long *args)
110{
111# ifdef CONFIG_IA32_EMULATION
112 if (task->thread_info.status & TS_COMPAT) {
113 *args++ = regs->bx;
114 *args++ = regs->cx;
115 *args++ = regs->dx;
116 *args++ = regs->si;
117 *args++ = regs->di;
118 *args = regs->bp;
119 } else
120# endif
121 {
122 *args++ = regs->di;
123 *args++ = regs->si;
124 *args++ = regs->dx;
125 *args++ = regs->r10;
126 *args++ = regs->r8;
127 *args = regs->r9;
128 }
129}
130
131static inline void syscall_set_arguments(struct task_struct *task,
132 struct pt_regs *regs,
133 const unsigned long *args)
134{
135# ifdef CONFIG_IA32_EMULATION
136 if (task->thread_info.status & TS_COMPAT) {
137 regs->bx = *args++;
138 regs->cx = *args++;
139 regs->dx = *args++;
140 regs->si = *args++;
141 regs->di = *args++;
142 regs->bp = *args;
143 } else
144# endif
145 {
146 regs->di = *args++;
147 regs->si = *args++;
148 regs->dx = *args++;
149 regs->r10 = *args++;
150 regs->r8 = *args++;
151 regs->r9 = *args;
152 }
153}
154
155static inline int syscall_get_arch(struct task_struct *task)
156{
157 /* x32 tasks should be considered AUDIT_ARCH_X86_64. */
158 return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
159 task->thread_info.status & TS_COMPAT)
160 ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
161}
162
163void do_syscall_64(unsigned long nr, struct pt_regs *regs);
164void do_int80_syscall_32(struct pt_regs *regs);
165long do_fast_syscall_32(struct pt_regs *regs);
166
167#endif /* CONFIG_X86_32 */
168
169#endif /* _ASM_X86_SYSCALL_H */