1 | /* Assembler macros for 64 bit S/390. |
2 | Copyright (C) 2001-2024 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 | |