1 /* Assembler macros for s390. 2 Copyright (C) 2000-2021 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 lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \ 49 lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \ 50 basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ; 51 #else 52 #define CALL_MCOUNT \ 53 lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \ 54 l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \ 55 .data ; .align 4 ; 0: .long 0 ; .text ; 56 #endif 57 #else 58 #define CALL_MCOUNT /* Do nothing. */ 59 #endif 60 61 /* Since C identifiers are not normally prefixed with an underscore 62 on this system, the asm identifier `syscall_error' intrudes on the 63 C name space. Make sure we use an innocuous name. */ 64 #define syscall_error __syscall_error 65 #define mcount _mcount 66 67 #undef PSEUDO 68 #define PSEUDO(name, syscall_name, args) \ 69 lose: SYSCALL_PIC_SETUP \ 70 basr %r1,0; \ 71 0: al %r1,1f-0b(%r1); \ 72 br %r1; \ 73 1: .long JUMPTARGET(syscall_error) - 0b; \ 74 .globl syscall_error; \ 75 ENTRY (name) \ 76 DO_CALL (syscall_name, args); \ 77 jm lose 78 79 #undef PSEUDO_END 80 #define PSEUDO_END(name) \ 81 END (name) 82 83 #undef JUMPTARGET 84 #ifdef SHARED 85 #define JUMPTARGET(name) name##@PLT 86 #define SYSCALL_PIC_SETUP \ 87 bras %r12,1f; \ 88 0: .long _GLOBAL_OFFSET_TABLE_-0b; \ 89 1: al %r12,0(%r12) 90 #else 91 #define JUMPTARGET(name) name 92 #define SYSCALL_PIC_SETUP /* Nothing. */ 93 #endif 94 95 /* Local label name for asm code. */ 96 #ifndef L 97 #define L(name) .L##name 98 #endif 99 100 #endif /* __ASSEMBLER__ */ 101