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| 1 | /* Copyright (C) 2000-2024 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _LINUX_S390_SYSDEP_H |
| 19 | #define _LINUX_S390_SYSDEP_H |
| 20 | |
| 21 | #include <sysdeps/s390/s390-32/sysdep.h> |
| 22 | #include <sysdeps/unix/sysdep.h> |
| 23 | #include <sysdeps/unix/sysv/linux/s390/sysdep.h> |
| 24 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
| 25 | #include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */ |
| 26 | #include <tls.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 | /* in newer 2.1 kernels __NR_syscall is missing so we define it here */ |
| 33 | #define __NR_syscall 0 |
| 34 | |
| 35 | #ifdef __ASSEMBLER__ |
| 36 | |
| 37 | /* Linux uses a negative return value to indicate syscall errors, unlike |
| 38 | most Unices, which use the condition codes' carry flag. |
| 39 | |
| 40 | Since version 2.1 the return value of a system call might be negative |
| 41 | even if the call succeeded. E.g., the `lseek' system call might return |
| 42 | a large offset. Therefore we must not anymore test for < 0, but test |
| 43 | for a real error by making sure the value in gpr2 is a real error |
| 44 | number. Linus said he will make sure that no syscall returns a value |
| 45 | in -1 .. -4095 as a valid result so we can safely test with -4095. */ |
| 46 | |
| 47 | #undef PSEUDO |
| 48 | #define PSEUDO(name, syscall_name, args) \ |
| 49 | .text; \ |
| 50 | ENTRY (name) \ |
| 51 | DO_CALL (syscall_name, args); \ |
| 52 | lhi %r4,-4095 ; \ |
| 53 | clr %r2,%r4 ; \ |
| 54 | jnl SYSCALL_ERROR_LABEL |
| 55 | |
| 56 | #undef PSEUDO_END |
| 57 | #define PSEUDO_END(name) \ |
| 58 | SYSCALL_ERROR_HANDLER; \ |
| 59 | END (name) |
| 60 | |
| 61 | #undef PSEUDO_NOERRNO |
| 62 | #define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| 63 | .text; \ |
| 64 | ENTRY (name) \ |
| 65 | DO_CALL (syscall_name, args) |
| 66 | |
| 67 | #undef PSEUDO_END_NOERRNO |
| 68 | #define PSEUDO_END_NOERRNO(name) \ |
| 69 | END (name) |
| 70 | |
| 71 | #undef PSEUDO_ERRVAL |
| 72 | #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| 73 | .text; \ |
| 74 | ENTRY (name) \ |
| 75 | DO_CALL (syscall_name, args); \ |
| 76 | lcr %r2,%r2 |
| 77 | |
| 78 | #undef PSEUDO_END_ERRVAL |
| 79 | #define PSEUDO_END_ERRVAL(name) \ |
| 80 | END (name) |
| 81 | |
| 82 | #undef SYSCALL_ERROR_LABEL |
| 83 | #ifndef PIC |
| 84 | # undef SYSCALL_ERROR_LABEL |
| 85 | # define SYSCALL_ERROR_LABEL 0f |
| 86 | # define SYSCALL_ERROR_HANDLER \ |
| 87 | 0: basr %r1,0; \ |
| 88 | 1: l %r1,2f-1b(%r1); \ |
| 89 | br %r1; \ |
| 90 | 2: .long syscall_error |
| 91 | #else |
| 92 | # if RTLD_PRIVATE_ERRNO |
| 93 | # undef SYSCALL_ERROR_LABEL |
| 94 | # define SYSCALL_ERROR_LABEL 0f |
| 95 | # define SYSCALL_ERROR_HANDLER \ |
| 96 | 0: basr %r1,0; \ |
| 97 | 1: al %r1,2f-1b(%r1); \ |
| 98 | lcr %r2,%r2; \ |
| 99 | st %r2,0(%r1); \ |
| 100 | lhi %r2,-1; \ |
| 101 | br %r14; \ |
| 102 | 2: .long rtld_errno-1b |
| 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 | basr %r1,0; \ |
| 114 | 1: al %r1,2f-1b(%r1); \ |
| 115 | l %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1); \ |
| 116 | ear %r2,%a0; \ |
| 117 | st %r0,0(%r1,%r2); \ |
| 118 | lhi %r2,-1; \ |
| 119 | br %r14; \ |
| 120 | 2: .long _GLOBAL_OFFSET_TABLE_-1b |
| 121 | # else |
| 122 | # undef SYSCALL_ERROR_LABEL |
| 123 | # define SYSCALL_ERROR_LABEL 0f |
| 124 | # define SYSCALL_ERROR_HANDLER \ |
| 125 | 0: basr %r1,0; \ |
| 126 | 1: al %r1,2f-1b(%r1); \ |
| 127 | l %r1,errno@GOT(%r1); \ |
| 128 | lcr %r2,%r2; \ |
| 129 | st %r2,0(%r1); \ |
| 130 | lhi %r2,-1; \ |
| 131 | br %r14; \ |
| 132 | 2: .long _GLOBAL_OFFSET_TABLE_-1b |
| 133 | # endif /* _LIBC_REENTRANT */ |
| 134 | #endif /* PIC */ |
| 135 | |
| 136 | /* Linux takes system call arguments in registers: |
| 137 | |
| 138 | syscall number 1 call-clobbered |
| 139 | arg 1 2 call-clobbered |
| 140 | arg 2 3 call-clobbered |
| 141 | arg 3 4 call-clobbered |
| 142 | arg 4 5 call-clobbered |
| 143 | arg 5 6 call-saved |
| 144 | arg 6 7 call-saved |
| 145 | |
| 146 | (Of course a function with say 3 arguments does not have entries for |
| 147 | arguments 4 and 5.) |
| 148 | For system calls with 6 parameters a stack operation is required |
| 149 | to load the 6th parameter to register 7. Call saved register 7 is |
| 150 | moved to register 0 and back to avoid an additional stack frame. |
| 151 | */ |
| 152 | |
| 153 | #define DO_CALL(syscall, args) \ |
| 154 | .if args > 5; \ |
| 155 | lr %r0,%r7; \ |
| 156 | l %r7,96(%r15); \ |
| 157 | .endif; \ |
| 158 | lhi %r1,SYS_ify (syscall); \ |
| 159 | svc 0; \ |
| 160 | .if args > 5; \ |
| 161 | lr %r7,%r0; \ |
| 162 | .endif |
| 163 | |
| 164 | #define ret \ |
| 165 | br 14 |
| 166 | |
| 167 | #define ret_NOERRNO \ |
| 168 | br 14 |
| 169 | |
| 170 | #define ret_ERRVAL \ |
| 171 | br 14 |
| 172 | |
| 173 | #else |
| 174 | |
| 175 | # undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
| 176 | # define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
| 177 | |
| 178 | #endif /* __ASSEMBLER__ */ |
| 179 | |
| 180 | #endif /* _LINUX_S390_SYSDEP_H */ |
| 181 |
Warning: That file was not part of the compilation database. It may have many parsing errors.