1 /* Syscall definitions, Linux PowerPC generic version.
2 Copyright (C) 2019-2023 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 <http://www.gnu.org/licenses/>. */
18
19 #ifndef _LINUX_POWERPC_SYSDEP_H
20 #define _LINUX_POWERPC_SYSDEP_H 1
21
22 #include <sysdeps/unix/sysv/linux/sysdep.h>
23 #include <sysdeps/unix/powerpc/sysdep.h>
24 #include <tls.h>
25 /* Define __set_errno() for INLINE_SYSCALL macro below. */
26 #include <errno.h>
27
28 /* For Linux we can use the system call table in the header file
29 /usr/include/asm/unistd.h
30 of the kernel. But these symbols do not follow the SYS_* syntax
31 so we have to redefine the `SYS_ify' macro here. */
32 #undef SYS_ify
33 #define SYS_ify(syscall_name) __NR_##syscall_name
34
35 /* Define a macro which expands inline into the wrapper code for a system
36 call. This use is for internal calls that do not need to handle errors
37 normally. It will never touch errno. This returns just what the kernel
38 gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
39 the negation of the return value in the kernel gets reverted. */
40
41 #define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, type, nr, args...) \
42 ({ \
43 register void *r0 __asm__ ("r0"); \
44 register long int r3 __asm__ ("r3"); \
45 register long int r4 __asm__ ("r4"); \
46 register long int r5 __asm__ ("r5"); \
47 register long int r6 __asm__ ("r6"); \
48 register long int r7 __asm__ ("r7"); \
49 register long int r8 __asm__ ("r8"); \
50 register type rval __asm__ ("r3"); \
51 LOADARGS_##nr (funcptr, args); \
52 __asm__ __volatile__ \
53 ("mtctr %0\n\t" \
54 "bctrl\n\t" \
55 "mfcr %0\n\t" \
56 "0:" \
57 : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), \
58 "+r" (r7), "+r" (r8) \
59 : : "r9", "r10", "r11", "r12", \
60 "cr0", "cr1", "cr5", "cr6", "cr7", \
61 "xer", "lr", "ctr", "memory"); \
62 __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3)); \
63 (long int) r0 & (1 << 28) ? -rval : rval; \
64 })
65
66 #define INTERNAL_VSYSCALL_CALL(funcptr, nr, args...) \
67 INTERNAL_VSYSCALL_CALL_TYPE(funcptr, long int, nr, args)
68
69 #define DECLARE_REGS \
70 register long int r0 __asm__ ("r0"); \
71 register long int r3 __asm__ ("r3"); \
72 register long int r4 __asm__ ("r4"); \
73 register long int r5 __asm__ ("r5"); \
74 register long int r6 __asm__ ("r6"); \
75 register long int r7 __asm__ ("r7"); \
76 register long int r8 __asm__ ("r8");
77
78 #define SYSCALL_SCV(nr) \
79 ({ \
80 __asm__ __volatile__ \
81 (".machine \"push\"\n\t" \
82 ".machine \"power9\"\n\t" \
83 "scv 0\n\t" \
84 ".machine \"pop\"\n\t" \
85 "0:" \
86 : "=&r" (r0), \
87 "=&r" (r3), "=&r" (r4), "=&r" (r5), \
88 "=&r" (r6), "=&r" (r7), "=&r" (r8) \
89 : ASM_INPUT_##nr \
90 : "r9", "r10", "r11", "r12", \
91 "cr0", "cr1", "cr5", "cr6", "cr7", \
92 "xer", "lr", "ctr", "memory"); \
93 r3; \
94 })
95
96 #define SYSCALL_SC(nr) \
97 ({ \
98 __asm__ __volatile__ \
99 ("sc\n\t" \
100 "mfcr %0\n\t" \
101 "0:" \
102 : "=&r" (r0), \
103 "=&r" (r3), "=&r" (r4), "=&r" (r5), \
104 "=&r" (r6), "=&r" (r7), "=&r" (r8) \
105 : ASM_INPUT_##nr \
106 : "r9", "r10", "r11", "r12", \
107 "xer", "cr0", "ctr", "memory"); \
108 r0 & (1 << 28) ? -r3 : r3; \
109 })
110
111 /* This will only be non-empty for 64-bit systems, see below. */
112 #define TRY_SYSCALL_SCV(nr)
113
114 #if defined(__PPC64__) || defined(__powerpc64__)
115 # define SYSCALL_ARG_SIZE 8
116
117 /* For the static case, unlike the dynamic loader, there is no compile-time way
118 to check if we are inside startup code. So we need to check if the thread
119 pointer has already been setup before trying to access the TLS. */
120 # ifndef SHARED
121 # define CHECK_THREAD_POINTER (__thread_register != 0)
122 # else
123 # define CHECK_THREAD_POINTER (1)
124 # endif
125
126 /* When inside the dynamic loader, the thread pointer may not have been
127 initialized yet, so don't check for scv support in that case. */
128 # if defined(USE_PPC_SCV) && !IS_IN(rtld)
129 # undef TRY_SYSCALL_SCV
130 # define TRY_SYSCALL_SCV(nr) \
131 CHECK_THREAD_POINTER && THREAD_GET_HWCAP() & PPC_FEATURE2_SCV ? \
132 SYSCALL_SCV(nr) :
133 # endif
134
135 #else
136 # define SYSCALL_ARG_SIZE 4
137 #endif
138
139 # define INTERNAL_SYSCALL_NCS(name, nr, args...) \
140 ({ \
141 DECLARE_REGS; \
142 LOADARGS_##nr (name, ##args); \
143 TRY_SYSCALL_SCV(nr) \
144 SYSCALL_SC(nr); \
145 })
146
147 #undef INTERNAL_SYSCALL
148 #define INTERNAL_SYSCALL(name, nr, args...) \
149 INTERNAL_SYSCALL_NCS (__NR_##name, nr, args)
150
151 #define LOADARGS_0(name, dummy) \
152 r0 = name
153 #define LOADARGS_1(name, __arg1) \
154 long int _arg1 = (long int) (__arg1); \
155 LOADARGS_0(name, 0); \
156 extern void __illegally_sized_syscall_arg1 (void); \
157 if (__builtin_classify_type (__arg1) != 5 \
158 && sizeof (__arg1) > SYSCALL_ARG_SIZE) \
159 __illegally_sized_syscall_arg1 (); \
160 r3 = _arg1
161 #define LOADARGS_2(name, __arg1, __arg2) \
162 long int _arg2 = (long int) (__arg2); \
163 LOADARGS_1(name, __arg1); \
164 extern void __illegally_sized_syscall_arg2 (void); \
165 if (__builtin_classify_type (__arg2) != 5 \
166 && sizeof (__arg2) > SYSCALL_ARG_SIZE) \
167 __illegally_sized_syscall_arg2 (); \
168 r4 = _arg2
169 #define LOADARGS_3(name, __arg1, __arg2, __arg3) \
170 long int _arg3 = (long int) (__arg3); \
171 LOADARGS_2(name, __arg1, __arg2); \
172 extern void __illegally_sized_syscall_arg3 (void); \
173 if (__builtin_classify_type (__arg3) != 5 \
174 && sizeof (__arg3) > SYSCALL_ARG_SIZE) \
175 __illegally_sized_syscall_arg3 (); \
176 r5 = _arg3
177 #define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
178 long int _arg4 = (long int) (__arg4); \
179 LOADARGS_3(name, __arg1, __arg2, __arg3); \
180 extern void __illegally_sized_syscall_arg4 (void); \
181 if (__builtin_classify_type (__arg4) != 5 \
182 && sizeof (__arg4) > SYSCALL_ARG_SIZE) \
183 __illegally_sized_syscall_arg4 (); \
184 r6 = _arg4
185 #define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
186 long int _arg5 = (long int) (__arg5); \
187 LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
188 extern void __illegally_sized_syscall_arg5 (void); \
189 if (__builtin_classify_type (__arg5) != 5 \
190 && sizeof (__arg5) > SYSCALL_ARG_SIZE) \
191 __illegally_sized_syscall_arg5 (); \
192 r7 = _arg5
193 #define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
194 long int _arg6 = (long int) (__arg6); \
195 LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
196 extern void __illegally_sized_syscall_arg6 (void); \
197 if (__builtin_classify_type (__arg6) != 5 \
198 && sizeof (__arg6) > SYSCALL_ARG_SIZE) \
199 __illegally_sized_syscall_arg6 (); \
200 r8 = _arg6
201
202 #define ASM_INPUT_0 "0" (r0)
203 #define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
204 #define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
205 #define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
206 #define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
207 #define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
208 #define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
209
210 /* List of system calls which are supported as vsyscalls. */
211 #define VDSO_NAME "LINUX_2.6.15"
212 #define VDSO_HASH 123718565
213
214 #if defined(__PPC64__) || defined(__powerpc64__)
215 #define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
216 #define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
217 #define HAVE_CLONE3_WRAPPER 1
218 #else
219 #define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
220 #define HAVE_CLOCK_GETTIME_VSYSCALL "__kernel_clock_gettime"
221 #endif
222 #define HAVE_GETCPU_VSYSCALL "__kernel_getcpu"
223 #define HAVE_TIME_VSYSCALL "__kernel_time"
224 #define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday"
225 #define HAVE_GET_TBFREQ "__kernel_get_tbfreq"
226
227 #endif /* _LINUX_POWERPC_SYSDEP_H */