1 /* Assembler and syscall macros. OpenRISC version.
2 Copyright (C) 2022-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _LINUX_OR1K_SYSDEP_H
20 #define _LINUX_OR1K_SYSDEP_H 1
21
22 #include <sysdeps/unix/sysv/linux/sysdep.h>
23 #include <sysdeps/or1k/sysdep.h>
24 #include <sysdeps/unix/sysdep.h>
25 #include <tls.h>
26
27 /* "workarounds" for generic code needing to handle 64-bit time_t. */
28
29 #undef __NR_clock_getres
30 #undef __NR_futex
31 #undef __NR_ppoll
32 #undef __NR_pselect6
33 #undef __NR_recvmmsg
34 #undef __NR_rt_sigtimedwait
35 #undef __NR_semtimedop
36 #undef __NR_utimensat
37
38 /* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c. */
39 #define __NR_clock_getres __NR_clock_getres_time64
40 /* Fix sysdeps/nptl/lowlevellock-futex.h. */
41 #define __NR_futex __NR_futex_time64
42 /* Fix sysdeps/unix/sysv/linux/pause.c. */
43 #define __NR_ppoll __NR_ppoll_time64
44 /* Fix sysdeps/unix/sysv/linux/select.c. */
45 #define __NR_pselect6 __NR_pselect6_time64
46 /* Fix sysdeps/unix/sysv/linux/recvmmsg.c. */
47 #define __NR_recvmmsg __NR_recvmmsg_time64
48 /* Fix sysdeps/unix/sysv/linux/sigtimedwait.c. */
49 #define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
50 /* Fix sysdeps/unix/sysv/linux/semtimedop.c. */
51 #define __NR_semtimedop __NR_semtimedop_time64
52 /* Hack sysdeps/unix/sysv/linux/generic/utimes.c. */
53 #define __NR_utimensat __NR_utimensat_time64
54
55 #undef SYS_ify
56 #define SYS_ify(syscall_name) (__NR_##syscall_name)
57
58 /* Linux uses a negative return value to indicate syscall errors,
59 unlike most Unices, which use the condition codes' carry flag.
60
61 Since version 2.1 the return value of a system call might be
62 negative even if the call succeeded. E.g., the lseek system call
63 might return a large offset. Therefore we must not anymore test
64 for < 0, but test for a real error by making sure the value in R0
65 is a real error number. Linus said he will make sure the no syscall
66 returns a value in -1 .. -4095 as a valid result so we can safely
67 test with -4095. */
68
69 #ifdef __ASSEMBLER__
70
71 /* Macros used in syscall-template.S */
72 #define ret l.jr r9; l.nop
73 #define ret_NOERRNO l.jr r9; l.nop
74
75 #undef DO_CALL
76 #define DO_CALL(syscall_name) \
77 l.addi r11, r0, SYS_ify (syscall_name); \
78 l.sys 1; \
79 l.nop
80
81 #undef PSEUDO
82 #define PSEUDO(name, syscall_name, args) \
83 ENTRY (name); \
84 DO_CALL(syscall_name); \
85 /* if -4096 < ret < 0 holds, it's an error */ \
86 l.sfgeui r11, 0xf001; \
87 l.bf L(pseudo_end); \
88 l.nop
89
90 #undef PSEUDO_NOERRNO
91 #define PSEUDO_NOERRNO(name, syscall_name, args) \
92 ENTRY (name); \
93 DO_CALL(syscall_name)
94
95 #undef PSEUDO_END
96 #define PSEUDO_END(name) \
97 L(pseudo_end): \
98 l.j SYSCALL_ERROR_NAME; \
99 l.ori r3,r11,0; \
100 END (name)
101
102 #undef PSEUDO_END_NOERRNO
103 #define PSEUDO_END_NOERRNO(name) \
104 END (name)
105
106 #ifndef PIC
107 /* For static code, on error jump to __syscall_error directly. */
108 # define SYSCALL_ERROR_NAME __syscall_error
109 #elif !IS_IN (libc)
110 /* Use the internal name for libc shared objects. */
111 # define SYSCALL_ERROR_NAME __GI___syscall_error
112 #else
113 /* Otherwise, on error do a full PLT jump. */
114 # define SYSCALL_ERROR_NAME plt(__syscall_error)
115 #endif
116
117 #else /* not __ASSEMBLER__ */
118
119 #include <errno.h>
120
121 extern long int __syscall_error (long int neg_errno);
122
123 #undef INTERNAL_SYSCALL
124 #define INTERNAL_SYSCALL(name, nr, args...) \
125 INTERNAL_SYSCALL_NCS (SYS_ify (name), nr, args)
126
127 /* The _NCS variant allows non-constant syscall numbers. */
128 #undef INTERNAL_SYSCALL_NCS
129 #define INTERNAL_SYSCALL_NCS(number, nr, args...) \
130 ({ unsigned long int __sys_result; \
131 { \
132 long int _sc_ret = (long int) number; \
133 LOAD_ARGS_##nr (args) \
134 register long int __sc_ret __asm__ ("r11") = _sc_ret; \
135 __asm__ __volatile__ ("l.sys 1\n\t" \
136 " l.nop\n\t" \
137 : "+r" (__sc_ret) \
138 : ASM_ARGS_##nr \
139 : ASM_CLOBBERS_##nr \
140 "r12", "r13", "r15", "r17", "r19", \
141 "r21", "r23", "r25", "r27", "r29", \
142 "r31", "memory"); \
143 __sys_result = __sc_ret; \
144 } \
145 (long int) __sys_result; })
146
147 /* From here on we have nested macros that generate code for
148 setting up syscall arguments. */
149
150 #define LOAD_ARGS_0()
151
152 #define ASM_ARGS_0
153 #define ASM_CLOBBERS_0 "r3", ASM_CLOBBERS_1
154
155 #define LOAD_ARGS_1(a) \
156 long int _a = (long int)(a); \
157 register long int __a __asm__ ("r3") = _a;
158 #define ASM_ARGS_1 "r" (__a)
159 #define ASM_CLOBBERS_1 "r4", ASM_CLOBBERS_2
160
161 #define LOAD_ARGS_2(a, b) \
162 long int _b = (long int)(b); \
163 LOAD_ARGS_1 (a) \
164 register long int __b __asm__ ("r4") = _b;
165 #define ASM_ARGS_2 ASM_ARGS_1, "r" (__b)
166 #define ASM_CLOBBERS_2 "r5", ASM_CLOBBERS_3
167
168 #define LOAD_ARGS_3(a, b, c) \
169 long int _c = (long int)(c); \
170 LOAD_ARGS_2 (a, b) \
171 register long int __c __asm__ ("r5") = _c;
172 #define ASM_ARGS_3 ASM_ARGS_2, "r" (__c)
173 #define ASM_CLOBBERS_3 "r6", ASM_CLOBBERS_4
174
175 #define LOAD_ARGS_4(a, b, c, d) \
176 LOAD_ARGS_3 (a, b, c) \
177 long int _d = (long int)(d); \
178 register long int __d __asm__ ("r6") = _d;
179 #define ASM_ARGS_4 ASM_ARGS_3, "r" (__d)
180 #define ASM_CLOBBERS_4 "r7", ASM_CLOBBERS_5
181
182 #define LOAD_ARGS_5(a, b, c, d, e) \
183 long int _e = (long int)(e); \
184 LOAD_ARGS_4 (a, b, c, d) \
185 register long int __e __asm__ ("r7") = _e;
186 #define ASM_ARGS_5 ASM_ARGS_4, "r" (__e)
187 #define ASM_CLOBBERS_5 "r8", ASM_CLOBBERS_6
188
189 #define LOAD_ARGS_6(a, b, c, d, e, f) \
190 long int _f = (long int)(f); \
191 LOAD_ARGS_5 (a, b, c, d, e) \
192 register long int __f __asm__ ("r8") = _f;
193 #define ASM_ARGS_6 ASM_ARGS_5, "r" (__f)
194 #define ASM_CLOBBERS_6
195
196 #endif /* not __ASSEMBLER__ */
197
198 #endif /* linux/or1k/sysdep.h */