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1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * s390 specific definitions for NOLIBC
4 */
5
6#ifndef _NOLIBC_ARCH_S390_H
7#define _NOLIBC_ARCH_S390_H
8#include <asm/signal.h>
9#include <asm/unistd.h>
10
11#include "compiler.h"
12#include "crt.h"
13
14/* Syscalls for s390:
15 * - registers are 64-bit
16 * - syscall number is passed in r1
17 * - arguments are in r2-r7
18 * - the system call is performed by calling the svc instruction
19 * - syscall return value is in r2
20 * - r1 and r2 are clobbered, others are preserved.
21 *
22 * Link s390 ABI: https://github.com/IBM/s390x-abi
23 *
24 */
25
26#define my_syscall0(num) \
27({ \
28 register long _num __asm__ ("1") = (num); \
29 register long _rc __asm__ ("2"); \
30 \
31 __asm__ volatile ( \
32 "svc 0\n" \
33 : "=d"(_rc) \
34 : "d"(_num) \
35 : "memory", "cc" \
36 ); \
37 _rc; \
38})
39
40#define my_syscall1(num, arg1) \
41({ \
42 register long _num __asm__ ("1") = (num); \
43 register long _arg1 __asm__ ("2") = (long)(arg1); \
44 \
45 __asm__ volatile ( \
46 "svc 0\n" \
47 : "+d"(_arg1) \
48 : "d"(_num) \
49 : "memory", "cc" \
50 ); \
51 _arg1; \
52})
53
54#define my_syscall2(num, arg1, arg2) \
55({ \
56 register long _num __asm__ ("1") = (num); \
57 register long _arg1 __asm__ ("2") = (long)(arg1); \
58 register long _arg2 __asm__ ("3") = (long)(arg2); \
59 \
60 __asm__ volatile ( \
61 "svc 0\n" \
62 : "+d"(_arg1) \
63 : "d"(_arg2), "d"(_num) \
64 : "memory", "cc" \
65 ); \
66 _arg1; \
67})
68
69#define my_syscall3(num, arg1, arg2, arg3) \
70({ \
71 register long _num __asm__ ("1") = (num); \
72 register long _arg1 __asm__ ("2") = (long)(arg1); \
73 register long _arg2 __asm__ ("3") = (long)(arg2); \
74 register long _arg3 __asm__ ("4") = (long)(arg3); \
75 \
76 __asm__ volatile ( \
77 "svc 0\n" \
78 : "+d"(_arg1) \
79 : "d"(_arg2), "d"(_arg3), "d"(_num) \
80 : "memory", "cc" \
81 ); \
82 _arg1; \
83})
84
85#define my_syscall4(num, arg1, arg2, arg3, arg4) \
86({ \
87 register long _num __asm__ ("1") = (num); \
88 register long _arg1 __asm__ ("2") = (long)(arg1); \
89 register long _arg2 __asm__ ("3") = (long)(arg2); \
90 register long _arg3 __asm__ ("4") = (long)(arg3); \
91 register long _arg4 __asm__ ("5") = (long)(arg4); \
92 \
93 __asm__ volatile ( \
94 "svc 0\n" \
95 : "+d"(_arg1) \
96 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_num) \
97 : "memory", "cc" \
98 ); \
99 _arg1; \
100})
101
102#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
103({ \
104 register long _num __asm__ ("1") = (num); \
105 register long _arg1 __asm__ ("2") = (long)(arg1); \
106 register long _arg2 __asm__ ("3") = (long)(arg2); \
107 register long _arg3 __asm__ ("4") = (long)(arg3); \
108 register long _arg4 __asm__ ("5") = (long)(arg4); \
109 register long _arg5 __asm__ ("6") = (long)(arg5); \
110 \
111 __asm__ volatile ( \
112 "svc 0\n" \
113 : "+d"(_arg1) \
114 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
115 "d"(_num) \
116 : "memory", "cc" \
117 ); \
118 _arg1; \
119})
120
121#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
122({ \
123 register long _num __asm__ ("1") = (num); \
124 register long _arg1 __asm__ ("2") = (long)(arg1); \
125 register long _arg2 __asm__ ("3") = (long)(arg2); \
126 register long _arg3 __asm__ ("4") = (long)(arg3); \
127 register long _arg4 __asm__ ("5") = (long)(arg4); \
128 register long _arg5 __asm__ ("6") = (long)(arg5); \
129 register long _arg6 __asm__ ("7") = (long)(arg6); \
130 \
131 __asm__ volatile ( \
132 "svc 0\n" \
133 : "+d"(_arg1) \
134 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
135 "d"(_arg6), "d"(_num) \
136 : "memory", "cc" \
137 ); \
138 _arg1; \
139})
140
141/* startup code */
142void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
143{
144 __asm__ volatile (
145 "lgr %r2, %r15\n" /* save stack pointer to %r2, as arg1 of _start_c */
146 "aghi %r15, -160\n" /* allocate new stackframe */
147 "xc 0(8,%r15), 0(%r15)\n" /* clear backchain */
148 "brasl %r14, _start_c\n" /* transfer to c runtime */
149 );
150 __builtin_unreachable();
151}
152
153struct s390_mmap_arg_struct {
154 unsigned long addr;
155 unsigned long len;
156 unsigned long prot;
157 unsigned long flags;
158 unsigned long fd;
159 unsigned long offset;
160};
161
162static __attribute__((unused))
163void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
164 off_t offset)
165{
166 struct s390_mmap_arg_struct args = {
167 .addr = (unsigned long)addr,
168 .len = (unsigned long)length,
169 .prot = prot,
170 .flags = flags,
171 .fd = fd,
172 .offset = (unsigned long)offset
173 };
174
175 return (void *)my_syscall1(__NR_mmap, &args);
176}
177#define sys_mmap sys_mmap
178
179static __attribute__((unused))
180pid_t sys_fork(void)
181{
182 return my_syscall5(__NR_clone, 0, SIGCHLD, 0, 0, 0);
183}
184#define sys_fork sys_fork
185
186#endif /* _NOLIBC_ARCH_S390_H */
1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * s390 specific definitions for NOLIBC
4 */
5
6#ifndef _NOLIBC_ARCH_S390_H
7#define _NOLIBC_ARCH_S390_H
8#include <asm/signal.h>
9#include <asm/unistd.h>
10
11#include "compiler.h"
12#include "crt.h"
13#include "std.h"
14
15/* Syscalls for s390:
16 * - registers are 64-bit
17 * - syscall number is passed in r1
18 * - arguments are in r2-r7
19 * - the system call is performed by calling the svc instruction
20 * - syscall return value is in r2
21 * - r1 and r2 are clobbered, others are preserved.
22 *
23 * Link s390 ABI: https://github.com/IBM/s390x-abi
24 *
25 */
26
27#define my_syscall0(num) \
28({ \
29 register long _num __asm__ ("1") = (num); \
30 register long _rc __asm__ ("2"); \
31 \
32 __asm__ volatile ( \
33 "svc 0\n" \
34 : "=d"(_rc) \
35 : "d"(_num) \
36 : "memory", "cc" \
37 ); \
38 _rc; \
39})
40
41#define my_syscall1(num, arg1) \
42({ \
43 register long _num __asm__ ("1") = (num); \
44 register long _arg1 __asm__ ("2") = (long)(arg1); \
45 \
46 __asm__ volatile ( \
47 "svc 0\n" \
48 : "+d"(_arg1) \
49 : "d"(_num) \
50 : "memory", "cc" \
51 ); \
52 _arg1; \
53})
54
55#define my_syscall2(num, arg1, arg2) \
56({ \
57 register long _num __asm__ ("1") = (num); \
58 register long _arg1 __asm__ ("2") = (long)(arg1); \
59 register long _arg2 __asm__ ("3") = (long)(arg2); \
60 \
61 __asm__ volatile ( \
62 "svc 0\n" \
63 : "+d"(_arg1) \
64 : "d"(_arg2), "d"(_num) \
65 : "memory", "cc" \
66 ); \
67 _arg1; \
68})
69
70#define my_syscall3(num, arg1, arg2, arg3) \
71({ \
72 register long _num __asm__ ("1") = (num); \
73 register long _arg1 __asm__ ("2") = (long)(arg1); \
74 register long _arg2 __asm__ ("3") = (long)(arg2); \
75 register long _arg3 __asm__ ("4") = (long)(arg3); \
76 \
77 __asm__ volatile ( \
78 "svc 0\n" \
79 : "+d"(_arg1) \
80 : "d"(_arg2), "d"(_arg3), "d"(_num) \
81 : "memory", "cc" \
82 ); \
83 _arg1; \
84})
85
86#define my_syscall4(num, arg1, arg2, arg3, arg4) \
87({ \
88 register long _num __asm__ ("1") = (num); \
89 register long _arg1 __asm__ ("2") = (long)(arg1); \
90 register long _arg2 __asm__ ("3") = (long)(arg2); \
91 register long _arg3 __asm__ ("4") = (long)(arg3); \
92 register long _arg4 __asm__ ("5") = (long)(arg4); \
93 \
94 __asm__ volatile ( \
95 "svc 0\n" \
96 : "+d"(_arg1) \
97 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_num) \
98 : "memory", "cc" \
99 ); \
100 _arg1; \
101})
102
103#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
104({ \
105 register long _num __asm__ ("1") = (num); \
106 register long _arg1 __asm__ ("2") = (long)(arg1); \
107 register long _arg2 __asm__ ("3") = (long)(arg2); \
108 register long _arg3 __asm__ ("4") = (long)(arg3); \
109 register long _arg4 __asm__ ("5") = (long)(arg4); \
110 register long _arg5 __asm__ ("6") = (long)(arg5); \
111 \
112 __asm__ volatile ( \
113 "svc 0\n" \
114 : "+d"(_arg1) \
115 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
116 "d"(_num) \
117 : "memory", "cc" \
118 ); \
119 _arg1; \
120})
121
122#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
123({ \
124 register long _num __asm__ ("1") = (num); \
125 register long _arg1 __asm__ ("2") = (long)(arg1); \
126 register long _arg2 __asm__ ("3") = (long)(arg2); \
127 register long _arg3 __asm__ ("4") = (long)(arg3); \
128 register long _arg4 __asm__ ("5") = (long)(arg4); \
129 register long _arg5 __asm__ ("6") = (long)(arg5); \
130 register long _arg6 __asm__ ("7") = (long)(arg6); \
131 \
132 __asm__ volatile ( \
133 "svc 0\n" \
134 : "+d"(_arg1) \
135 : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
136 "d"(_arg6), "d"(_num) \
137 : "memory", "cc" \
138 ); \
139 _arg1; \
140})
141
142/* startup code */
143void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
144{
145 __asm__ volatile (
146 "lgr %r2, %r15\n" /* save stack pointer to %r2, as arg1 of _start_c */
147 "aghi %r15, -160\n" /* allocate new stackframe */
148 "xc 0(8,%r15), 0(%r15)\n" /* clear backchain */
149 "brasl %r14, _start_c\n" /* transfer to c runtime */
150 );
151 __nolibc_entrypoint_epilogue();
152}
153
154struct s390_mmap_arg_struct {
155 unsigned long addr;
156 unsigned long len;
157 unsigned long prot;
158 unsigned long flags;
159 unsigned long fd;
160 unsigned long offset;
161};
162
163static __attribute__((unused))
164void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
165 off_t offset)
166{
167 struct s390_mmap_arg_struct args = {
168 .addr = (unsigned long)addr,
169 .len = (unsigned long)length,
170 .prot = prot,
171 .flags = flags,
172 .fd = fd,
173 .offset = (unsigned long)offset
174 };
175
176 return (void *)my_syscall1(__NR_mmap, &args);
177}
178#define sys_mmap sys_mmap
179
180static __attribute__((unused))
181pid_t sys_fork(void)
182{
183 return my_syscall5(__NR_clone, 0, SIGCHLD, 0, 0, 0);
184}
185#define sys_fork sys_fork
186
187#endif /* _NOLIBC_ARCH_S390_H */