/* Assembler macros for s390. Copyright (C) 2000-2019 Free Software Foundation, Inc. Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <sysdeps/generic/sysdep.h> #ifdef __ASSEMBLER__ /* Syntactic details of assembler. */ /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ #define ALIGNARG(log2) 1<<log2 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; /* Define an entry point visible from C. */ #define ENTRY(name) \ .globl C_SYMBOL_NAME(name); \ .type C_SYMBOL_NAME(name),@function; \ .align ALIGNARG(4); \ C_LABEL(name) \ cfi_startproc; \ CALL_MCOUNT #undef END #define END(name) \ cfi_endproc; \ ASM_SIZE_DIRECTIVE(name) \ /* If compiled for profiling, call `mcount' at the start of each function. */ #ifdef PROF #ifdef PIC #define CALL_MCOUNT \ lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \ lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \ basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ; #else #define CALL_MCOUNT \ lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \ l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \ .data ; .align 4 ; 0: .long 0 ; .text ; #endif #else #define CALL_MCOUNT /* Do nothing. */ #endif /* Since C identifiers are not normally prefixed with an underscore on this system, the asm identifier `syscall_error' intrudes on the C name space. Make sure we use an innocuous name. */ #define syscall_error __syscall_error #define mcount _mcount #undef PSEUDO #define PSEUDO(name, syscall_name, args) \ lose: SYSCALL_PIC_SETUP \ basr %r1,0; \ 0: al %r1,1f-0b(%r1); \ br %r1; \ 1: .long JUMPTARGET(syscall_error) - 0b; \ .globl syscall_error; \ ENTRY (name) \ DO_CALL (syscall_name, args); \ jm lose #undef PSEUDO_END #define PSEUDO_END(name) \ END (name) #undef JUMPTARGET #ifdef SHARED #define JUMPTARGET(name) name##@PLT #define SYSCALL_PIC_SETUP \ bras %r12,1f; \ 0: .long _GLOBAL_OFFSET_TABLE_-0b; \ 1: al %r12,0(%r12) #else #define JUMPTARGET(name) name #define SYSCALL_PIC_SETUP /* Nothing. */ #endif /* Local label name for asm code. */ #ifndef L #define L(name) .L##name #endif #endif /* __ASSEMBLER__ */