| 1 | /* Assembler macros for s390. |
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| 2 | Copyright (C) 2000-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdeps/generic/sysdep.h> |
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| 20 | |
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| 21 | #ifdef __ASSEMBLER__ |
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| 22 | |
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| 23 | /* Syntactic details of assembler. */ |
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| 24 | |
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| 25 | /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ |
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| 26 | #define ALIGNARG(log2) 1<<log2 |
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| 27 | #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; |
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| 28 | |
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| 29 | |
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| 30 | /* Define an entry point visible from C. */ |
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| 31 | #define ENTRY(name) \ |
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| 32 | .globl C_SYMBOL_NAME(name); \ |
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| 33 | .type C_SYMBOL_NAME(name),@function; \ |
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| 34 | .align ALIGNARG(4); \ |
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| 35 | C_LABEL(name) \ |
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| 36 | cfi_startproc; \ |
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| 37 | CALL_MCOUNT |
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| 38 | |
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| 39 | #undef END |
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| 40 | #define END(name) \ |
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| 41 | cfi_endproc; \ |
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| 42 | ASM_SIZE_DIRECTIVE(name) \ |
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| 43 | |
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| 44 | /* If compiled for profiling, call `mcount' at the start of each function. */ |
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| 45 | #ifdef PROF |
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| 46 | #ifdef PIC |
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| 47 | #define CALL_MCOUNT \ |
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| 48 | lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \ |
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| 49 | lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \ |
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| 50 | basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ; |
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| 51 | #else |
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| 52 | #define CALL_MCOUNT \ |
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| 53 | lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \ |
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| 54 | l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \ |
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| 55 | .data ; .align 4 ; 0: .long 0 ; .text ; |
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| 56 | #endif |
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| 57 | #else |
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| 58 | #define CALL_MCOUNT /* Do nothing. */ |
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| 59 | #endif |
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| 60 | |
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| 61 | /* Since C identifiers are not normally prefixed with an underscore |
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| 62 | on this system, the asm identifier `syscall_error' intrudes on the |
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| 63 | C name space. Make sure we use an innocuous name. */ |
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| 64 | #define syscall_error __syscall_error |
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| 65 | #define mcount _mcount |
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| 66 | |
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| 67 | #undef PSEUDO |
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| 68 | #define PSEUDO(name, syscall_name, args) \ |
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| 69 | lose: SYSCALL_PIC_SETUP \ |
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| 70 | basr %r1,0; \ |
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| 71 | 0: al %r1,1f-0b(%r1); \ |
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| 72 | br %r1; \ |
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| 73 | 1: .long JUMPTARGET(syscall_error) - 0b; \ |
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| 74 | .globl syscall_error; \ |
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| 75 | ENTRY (name) \ |
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| 76 | DO_CALL (syscall_name, args); \ |
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| 77 | jm lose |
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| 78 | |
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| 79 | #undef PSEUDO_END |
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| 80 | #define PSEUDO_END(name) \ |
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| 81 | END (name) |
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| 82 | |
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| 83 | #undef JUMPTARGET |
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| 84 | #ifdef SHARED |
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| 85 | #define JUMPTARGET(name) name##@PLT |
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| 86 | #define SYSCALL_PIC_SETUP \ |
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| 87 | bras %r12,1f; \ |
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| 88 | 0: .long _GLOBAL_OFFSET_TABLE_-0b; \ |
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| 89 | 1: al %r12,0(%r12) |
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| 90 | #else |
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| 91 | #define JUMPTARGET(name) name |
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| 92 | #define SYSCALL_PIC_SETUP /* Nothing. */ |
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| 93 | #endif |
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| 94 | |
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| 95 | /* Local label name for asm code. */ |
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| 96 | #ifndef L |
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| 97 | #define L(name) .L##name |
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| 98 | #endif |
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| 99 | |
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| 100 | #endif /* __ASSEMBLER__ */ |
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| 101 | |
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