1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* SPARC (32bit and 64bit) specific definitions for NOLIBC
* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
*/
#ifndef _NOLIBC_ARCH_SPARC_H
#define _NOLIBC_ARCH_SPARC_H
#include <linux/unistd.h>
#include "compiler.h"
#include "crt.h"
/*
* Syscalls for SPARC:
* - registers are native word size
* - syscall number is passed in g1
* - arguments are in o0-o5
* - the system call is performed by calling a trap instruction
* - syscall return value is in o0
* - syscall error flag is in the carry bit of the processor status register
*/
#ifdef __arch64__
#define _NOLIBC_SYSCALL "t 0x6d\n" \
"bcs,a %%xcc, 1f\n" \
"sub %%g0, %%o0, %%o0\n" \
"1:\n"
#else
#define _NOLIBC_SYSCALL "t 0x10\n" \
"bcs,a 1f\n" \
"sub %%g0, %%o0, %%o0\n" \
"1:\n"
#endif /* __arch64__ */
#define my_syscall0(num) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0"); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall1(num, arg1) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall2(num, arg1, arg2) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
register long _arg2 __asm__ ("o1") = (long)(arg2); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall3(num, arg1, arg2, arg3) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
register long _arg2 __asm__ ("o1") = (long)(arg2); \
register long _arg3 __asm__ ("o2") = (long)(arg3); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall4(num, arg1, arg2, arg3, arg4) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
register long _arg2 __asm__ ("o1") = (long)(arg2); \
register long _arg3 __asm__ ("o2") = (long)(arg3); \
register long _arg4 __asm__ ("o3") = (long)(arg4); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
register long _arg2 __asm__ ("o1") = (long)(arg2); \
register long _arg3 __asm__ ("o2") = (long)(arg3); \
register long _arg4 __asm__ ("o3") = (long)(arg4); \
register long _arg5 __asm__ ("o4") = (long)(arg5); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
({ \
register long _num __asm__ ("g1") = (num); \
register long _arg1 __asm__ ("o0") = (long)(arg1); \
register long _arg2 __asm__ ("o1") = (long)(arg2); \
register long _arg3 __asm__ ("o2") = (long)(arg3); \
register long _arg4 __asm__ ("o3") = (long)(arg4); \
register long _arg5 __asm__ ("o4") = (long)(arg5); \
register long _arg6 __asm__ ("o5") = (long)(arg6); \
\
__asm__ volatile ( \
_NOLIBC_SYSCALL \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
"r"(_num) \
: "memory", "cc" \
); \
_arg1; \
})
/* startup code */
void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
{
__asm__ volatile (
/*
* Save argc pointer to o0, as arg1 of _start_c.
* Account for the window save area, which is 16 registers wide.
*/
#ifdef __arch64__
"add %sp, 128 + 2047, %o0\n" /* on sparc64 / v9 the stack is offset by 2047 */
#else
"add %sp, 64, %o0\n"
#endif
"b,a _start_c\n" /* transfer to c runtime */
);
__nolibc_entrypoint_epilogue();
}
static pid_t getpid(void);
static __attribute__((unused))
pid_t sys_fork(void)
{
pid_t parent, ret;
parent = getpid();
ret = my_syscall0(__NR_fork);
/* The syscall returns the parent pid in the child instead of 0 */
if (ret == parent)
return 0;
else
return ret;
}
#define sys_fork sys_fork
static __attribute__((unused))
pid_t sys_vfork(void)
{
pid_t parent, ret;
parent = getpid();
ret = my_syscall0(__NR_vfork);
/* The syscall returns the parent pid in the child instead of 0 */
if (ret == parent)
return 0;
else
return ret;
}
#define sys_vfork sys_vfork
#endif /* _NOLIBC_ARCH_SPARC_H */
|
