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1 | /* Assembler macros for 64 bit S/390. |
---|---|
2 | Copyright (C) 2001-2024 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_S390_SYSDEP_H |
20 | #define _LINUX_S390_SYSDEP_H |
21 | |
22 | #include <sysdeps/s390/s390-64/sysdep.h> |
23 | #include <sysdeps/unix/sysdep.h> |
24 | #include <sysdeps/unix/sysv/linux/s390/sysdep.h> |
25 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
26 | #include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */ |
27 | #include <tls.h> |
28 | |
29 | /* For Linux we can use the system call table in the header file |
30 | /usr/include/asm/unistd.h |
31 | of the kernel. But these symbols do not follow the SYS_* syntax |
32 | so we have to redefine the `SYS_ify' macro here. */ |
33 | /* In newer 2.1 kernels __NR_syscall is missing so we define it here. */ |
34 | #define __NR_syscall 0 |
35 | |
36 | #undef SYS_ify |
37 | #define SYS_ify(syscall_name) __NR_##syscall_name |
38 | |
39 | #ifdef __ASSEMBLER__ |
40 | |
41 | /* Linux uses a negative return value to indicate syscall errors, unlike |
42 | most Unices, which use the condition codes' carry flag. |
43 | |
44 | Since version 2.1 the return value of a system call might be negative |
45 | even if the call succeeded. E.g., the `lseek' system call might return |
46 | a large offset. Therefore we must not anymore test for < 0, but test |
47 | for a real error by making sure the value in gpr2 is a real error |
48 | number. Linus said he will make sure that no syscall returns a value |
49 | in -1 .. -4095 as a valid result so we can safely test with -4095. */ |
50 | |
51 | #undef PSEUDO |
52 | #define PSEUDO(name, syscall_name, args) \ |
53 | .text; \ |
54 | ENTRY (name) \ |
55 | DO_CALL (syscall_name, args); \ |
56 | lghi %r4,-4095 ; \ |
57 | clgr %r2,%r4 ; \ |
58 | jgnl SYSCALL_ERROR_LABEL |
59 | |
60 | #undef PSEUDO_END |
61 | #define PSEUDO_END(name) \ |
62 | SYSCALL_ERROR_HANDLER; \ |
63 | END (name) |
64 | |
65 | #undef PSEUDO_NOERRNO |
66 | #define PSEUDO_NOERRNO(name, syscall_name, args) \ |
67 | .text; \ |
68 | ENTRY (name) \ |
69 | DO_CALL (syscall_name, args) |
70 | |
71 | #undef PSEUDO_END_NOERRNO |
72 | #define PSEUDO_END_NOERRNO(name) \ |
73 | SYSCALL_ERROR_HANDLER; \ |
74 | END (name) |
75 | |
76 | #undef PSEUDO_ERRVAL |
77 | #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
78 | .text; \ |
79 | ENTRY (name) \ |
80 | DO_CALL (syscall_name, args); \ |
81 | lcgr %r2,%r2 |
82 | |
83 | #undef PSEUDO_END_ERRVAL |
84 | #define PSEUDO_END_ERRVAL(name) \ |
85 | SYSCALL_ERROR_HANDLER; \ |
86 | END (name) |
87 | |
88 | #undef SYSCALL_ERROR_LABEL |
89 | #ifndef PIC |
90 | # undef SYSCALL_ERROR_LABEL |
91 | # define SYSCALL_ERROR_LABEL syscall_error |
92 | # define SYSCALL_ERROR_HANDLER |
93 | #else |
94 | # if RTLD_PRIVATE_ERRNO |
95 | # undef SYSCALL_ERROR_LABEL |
96 | # define SYSCALL_ERROR_LABEL 0f |
97 | # define SYSCALL_ERROR_HANDLER \ |
98 | 0: larl %r1,rtld_errno; \ |
99 | lcr %r2,%r2; \ |
100 | st %r2,0(%r1); \ |
101 | lghi %r2,-1; \ |
102 | br %r14 |
103 | # elif defined _LIBC_REENTRANT |
104 | # if IS_IN (libc) |
105 | # define SYSCALL_ERROR_ERRNO __libc_errno |
106 | # else |
107 | # define SYSCALL_ERROR_ERRNO errno |
108 | # endif |
109 | # undef SYSCALL_ERROR_LABEL |
110 | # define SYSCALL_ERROR_LABEL 0f |
111 | # define SYSCALL_ERROR_HANDLER \ |
112 | 0: lcr %r0,%r2; \ |
113 | larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \ |
114 | lg %r1,0(%r1); \ |
115 | ear %r2,%a0; \ |
116 | sllg %r2,%r2,32; \ |
117 | ear %r2,%a1; \ |
118 | st %r0,0(%r1,%r2); \ |
119 | lghi %r2,-1; \ |
120 | br %r14 |
121 | # else |
122 | # undef SYSCALL_ERROR_LABEL |
123 | # define SYSCALL_ERROR_LABEL 0f |
124 | # define SYSCALL_ERROR_HANDLER \ |
125 | 0: larl %r1,_GLOBAL_OFFSET_TABLE_; \ |
126 | lg %r1,errno@GOT(%r1); \ |
127 | lcr %r2,%r2; \ |
128 | st %r2,0(%r1); \ |
129 | lghi %r2,-1; \ |
130 | br %r14 |
131 | # endif /* _LIBC_REENTRANT */ |
132 | #endif /* PIC */ |
133 | |
134 | /* Linux takes system call arguments in registers: |
135 | |
136 | syscall number 1 call-clobbered |
137 | arg 1 2 call-clobbered |
138 | arg 2 3 call-clobbered |
139 | arg 3 4 call-clobbered |
140 | arg 4 5 call-clobbered |
141 | arg 5 6 call-saved |
142 | arg 6 7 call-saved |
143 | |
144 | (Of course a function with say 3 arguments does not have entries for |
145 | arguments 4 and 5.) |
146 | For system calls with 6 parameters a stack operation is required |
147 | to load the 6th parameter to register 7. Call saved register 7 is |
148 | moved to register 0 and back to avoid an additional stack frame. |
149 | */ |
150 | |
151 | #define DO_CALL(syscall, args) \ |
152 | .if args > 5; \ |
153 | lgr %r0,%r7; \ |
154 | lg %r7,160(%r15); \ |
155 | .endif; \ |
156 | lghi %r1,SYS_ify (syscall); \ |
157 | svc 0; \ |
158 | .if args > 5; \ |
159 | lgr %r7,%r0; \ |
160 | .endif |
161 | |
162 | #define ret \ |
163 | br 14 |
164 | |
165 | #define ret_NOERRNO \ |
166 | br 14 |
167 | |
168 | #define ret_ERRVAL \ |
169 | br 14 |
170 | |
171 | #else |
172 | |
173 | # undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
174 | # define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
175 | |
176 | #endif /* __ASSEMBLER__ */ |
177 | |
178 | #endif /* _LINUX_S390_SYSDEP_H */ |
179 |
Warning: That file was not part of the compilation database. It may have many parsing errors.