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c9cf6dde | 1 | /* Assembler macros for x86-64. |
6dbdc56c | 2 | Copyright (C) 2001, 2002 Free Software Foundation, Inc. |
c9cf6dde AJ |
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, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <sysdeps/generic/sysdep.h> | |
21 | ||
22 | #ifdef __ASSEMBLER__ | |
23 | ||
24 | /* Syntactic details of assembler. */ | |
25 | ||
26 | #ifdef HAVE_ELF | |
27 | ||
28 | /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ | |
29 | #define ALIGNARG(log2) 1<<log2 | |
30 | /* For ELF we need the `.type' directive to make shared libs work right. */ | |
31 | #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg; | |
32 | #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; | |
33 | ||
34 | /* In ELF C symbols are asm symbols. */ | |
35 | #undef NO_UNDERSCORES | |
36 | #define NO_UNDERSCORES | |
37 | ||
38 | #else | |
39 | ||
40 | #define ALIGNARG(log2) log2 | |
41 | #define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */ | |
42 | #define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */ | |
43 | ||
44 | #endif | |
45 | ||
46 | ||
47 | /* Define an entry point visible from C. */ | |
48 | #define ENTRY(name) \ | |
49 | ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ | |
50 | ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ | |
51 | .align ALIGNARG(4); \ | |
52 | C_LABEL(name) \ | |
53 | CALL_MCOUNT | |
54 | ||
55 | #undef END | |
56 | #define END(name) \ | |
57 | ASM_SIZE_DIRECTIVE(name) \ | |
58 | ||
59 | /* If compiled for profiling, call `mcount' at the start of each function. */ | |
60 | #ifdef PROF | |
c9cf6dde AJ |
61 | /* The mcount code relies on a normal frame pointer being on the stack |
62 | to locate our caller, so push one just for its benefit. */ | |
63 | #define CALL_MCOUNT \ | |
6dbdc56c | 64 | pushq %rbp; movq %rsp, %rbp; call JUMPTARGET(mcount); popq %rbp; |
c9cf6dde AJ |
65 | #else |
66 | #define CALL_MCOUNT /* Do nothing. */ | |
67 | #endif | |
68 | ||
69 | #ifdef NO_UNDERSCORES | |
70 | /* Since C identifiers are not normally prefixed with an underscore | |
71 | on this system, the asm identifier `syscall_error' intrudes on the | |
72 | C name space. Make sure we use an innocuous name. */ | |
73 | #define syscall_error __syscall_error | |
74 | #define mcount _mcount | |
75 | #endif | |
76 | ||
77 | #define PSEUDO(name, syscall_name, args) \ | |
78 | lose: \ | |
79 | jmp JUMPTARGET(syscall_error) \ | |
80 | .globl syscall_error; \ | |
81 | ENTRY (name) \ | |
82 | DO_CALL (syscall_name, args); \ | |
83 | jb lose | |
84 | ||
85 | #undef PSEUDO_END | |
86 | #define PSEUDO_END(name) \ | |
87 | END (name) | |
88 | ||
89 | #ifdef PIC | |
90 | #define JUMPTARGET(name) name##@PLT | |
91 | #else | |
92 | #define JUMPTARGET(name) name | |
93 | #endif | |
94 | ||
95 | /* Local label name for asm code. */ | |
96 | #ifndef L | |
5bbfc1ea RM |
97 | # ifdef HAVE_ELF |
98 | /* ELF-like local names start with `.L'. */ | |
99 | # define L(name) .L##name | |
100 | # else | |
101 | # define L(name) name | |
102 | # endif | |
c9cf6dde AJ |
103 | #endif |
104 | ||
105 | #endif /* __ASSEMBLER__ */ |