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[glibc.git] / sysdeps / i386 / sysdep.h
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1 /* Assembler macros for i386.
2 Copyright (C) 1991, 92, 93, 95, 96, 98 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <sysdeps/generic/sysdep.h>
22 #ifdef __ASSEMBLER__
24 /* Syntactic details of assembler. */
26 #ifdef HAVE_ELF
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;
34 /* In ELF C symbols are asm symbols. */
35 #undef NO_UNDERSCORES
36 #define NO_UNDERSCORES
38 #else
40 #define ALIGNARG(log2) log2
41 #define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
42 #define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
44 #endif
47 /* Define an entry point visible from C.
49 There is currently a bug in gdb which prevents us from specifying
50 incomplete stabs information. Fake some entries here which specify
51 the current source file. */
52 #define ENTRY(name) \
53 STABS_CURRENT_FILE1("") \
54 STABS_CURRENT_FILE(name) \
55 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
56 ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \
57 .align ALIGNARG(4); \
58 STABS_FUN(name) \
59 C_LABEL(name) \
60 CALL_MCOUNT
62 #undef END
63 #define END(name) \
64 ASM_SIZE_DIRECTIVE(name) \
65 STABS_FUN_END(name)
67 /* Remove the following two lines once the gdb bug is fixed. */
68 #define STABS_CURRENT_FILE(name) \
69 STABS_CURRENT_FILE1 (#name)
70 #define STABS_CURRENT_FILE1(name) \
71 1: .stabs name,100,0,0,1b;
72 /* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int',
73 the same way gcc does it. */
74 #define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1))
75 #define STABS_FUN2(name, namestr) \
76 .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \
77 .stabs #namestr,36,0,0,name;
78 #define STABS_FUN_END(name) \
79 1: .stabs "",36,0,0,1b-name;
81 /* If compiled for profiling, call `mcount' at the start of each function. */
82 #ifdef PROF
83 /* The mcount code relies on a normal frame pointer being on the stack
84 to locate our caller, so push one just for its benefit. */
85 #define CALL_MCOUNT \
86 pushl %ebp; movl %esp, %ebp; call JUMPTARGET(mcount); popl %ebp;
87 #else
88 #define CALL_MCOUNT /* Do nothing. */
89 #endif
91 #ifdef NO_UNDERSCORES
92 /* Since C identifiers are not normally prefixed with an underscore
93 on this system, the asm identifier `syscall_error' intrudes on the
94 C name space. Make sure we use an innocuous name. */
95 #define syscall_error __syscall_error
96 #define mcount _mcount
97 #endif
99 #define PSEUDO(name, syscall_name, args) \
100 lose: SYSCALL_PIC_SETUP \
101 jmp JUMPTARGET(syscall_error) \
102 .globl syscall_error; \
103 ENTRY (name) \
104 DO_CALL (syscall_name, args); \
105 jb lose
107 #undef PSEUDO_END
108 #define PSEUDO_END(name) \
109 END (name)
111 #ifdef PIC
112 #define JUMPTARGET(name) name##@PLT
113 #define SYSCALL_PIC_SETUP \
114 pushl %ebx; \
115 call 0f; \
116 0: popl %ebx; \
117 addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
118 #else
119 #define JUMPTARGET(name) name
120 #define SYSCALL_PIC_SETUP /* Nothing. */
121 #endif
123 /* Local label name for asm code. */
124 #ifndef L
125 #define L(name) name
126 #endif
128 #endif /* __ASSEMBLER__ */