1 /* Assembler macros for 64 bit S/390. 2 Copyright (C) 2001-2022 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 #include <sysdeps/generic/sysdep.h> 20 21 #ifdef __ASSEMBLER__ 22 23 /* Syntactic details of assembler. */ 24 25 /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ 26 #define ALIGNARG(log2) 1<<log2 27 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; 28 29 30 /* Define an entry point visible from C. */ 31 #define ENTRY(name) \ 32 .globl C_SYMBOL_NAME(name); \ 33 .type C_SYMBOL_NAME(name),@function; \ 34 .align ALIGNARG(4); \ 35 C_LABEL(name) \ 36 cfi_startproc; \ 37 CALL_MCOUNT 38 39 #undef END 40 #define END(name) \ 41 cfi_endproc; \ 42 ASM_SIZE_DIRECTIVE(name) \ 43 44 /* If compiled for profiling, call `mcount' at the start of each function. */ 45 #ifdef PROF 46 #ifdef PIC 47 #define CALL_MCOUNT \ 48 lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \ 49 .data ; .align 4 ; 0: .long 0 ; .text ; 50 #else 51 #define CALL_MCOUNT \ 52 lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 14,0 ; \ 53 .data ; .align 4 ; 0: .long 0 ; .text ; 54 #endif 55 #else 56 #define CALL_MCOUNT /* Do nothing. */ 57 #endif 58 59 /* Since C identifiers are not normally prefixed with an underscore 60 on this system, the asm identifier `syscall_error' intrudes on the 61 C name space. Make sure we use an innocuous name. */ 62 #define syscall_error __syscall_error 63 #define mcount _mcount 64 65 #undef PSEUDO 66 #define PSEUDO(name, syscall_name, args) \ 67 lose: SYSCALL_PIC_SETUP \ 68 jg JUMPTARGET(syscall_error); \ 69 .globl syscall_error; \ 70 ENTRY (name) \ 71 DO_CALL (syscall_name, args); \ 72 jm lose 73 74 #undef PSEUDO_END 75 #define PSEUDO_END(name) \ 76 END (name) 77 78 #undef JUMPTARGET 79 #ifdef SHARED 80 #define JUMPTARGET(name) name##@PLT 81 #define SYSCALL_PIC_SETUP \ 82 larl %r12,_GLOBAL_OFFSET_TABLE_ 83 #else 84 #define JUMPTARGET(name) name 85 #define SYSCALL_PIC_SETUP /* Nothing. */ 86 #endif 87 88 /* Local label name for asm code. */ 89 #ifndef L 90 #define L(name) .L##name 91 #endif 92 93 #endif /* __ASSEMBLER__ */ 94