| /* Assembler macros for s390. |
| Copyright (C) 2000-2018 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(2); \ |
| 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__ */ |