Include float.h.
[kopensolaris-gnu/glibc.git] / sysdeps / i386 / sysdep.h
1 /* Assembler macros for i386.
2    Copyright (C) 1991-93,95,96,98,2002,2003,2005,2006
3    Free Software Foundation, Inc.
4    This file is part of the GNU C Library.
5
6    The GNU C Library is free software; you can redistribute it and/or
7    modify it under the terms of the GNU Lesser General Public
8    License as published by the Free Software Foundation; either
9    version 2.1 of the License, or (at your option) any later version.
10
11    The GNU C Library is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14    Lesser General Public License for more details.
15
16    You should have received a copy of the GNU Lesser General Public
17    License along with the GNU C Library; if not, write to the Free
18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19    02111-1307 USA.  */
20
21 #include <sysdeps/generic/sysdep.h>
22
23 #ifdef  __ASSEMBLER__
24
25 /* Syntactic details of assembler.  */
26
27 #ifdef HAVE_ELF
28
29 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
30 #define ALIGNARG(log2) 1<<log2
31 /* For ELF we need the `.type' directive to make shared libs work right.  */
32 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
33 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
34
35 /* In ELF C symbols are asm symbols.  */
36 #undef  NO_UNDERSCORES
37 #define NO_UNDERSCORES
38
39 #else
40
41 #define ALIGNARG(log2) log2
42 #define ASM_TYPE_DIRECTIVE(name,type)   /* Nothing is specified.  */
43 #define ASM_SIZE_DIRECTIVE(name)        /* Nothing is specified.  */
44
45 #endif
46
47
48 /* Define an entry point visible from C.
49
50    There is currently a bug in gdb which prevents us from specifying
51    incomplete stabs information.  Fake some entries here which specify
52    the current source file.  */
53 #define ENTRY(name)                                                           \
54   STABS_CURRENT_FILE1("")                                                     \
55   STABS_CURRENT_FILE(name)                                                    \
56   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
57   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
58   .align ALIGNARG(4);                                                         \
59   STABS_FUN(name)                                                             \
60   C_LABEL(name)                                                               \
61   cfi_startproc;                                                              \
62   CALL_MCOUNT
63
64 #undef  END
65 #define END(name)                                                             \
66   cfi_endproc;                                                                \
67   ASM_SIZE_DIRECTIVE(name)                                                    \
68   STABS_FUN_END(name)
69
70 #ifdef HAVE_CPP_ASM_DEBUGINFO
71 /* Disable that goop, because we just pass -g through to the assembler
72    and it generates proper line number information directly.  */
73 # define STABS_CURRENT_FILE1(name)
74 # define STABS_CURRENT_FILE(name)
75 # define STABS_FUN(name)
76 # define STABS_FUN_END(name)
77 #else
78 /* Remove the following two lines once the gdb bug is fixed.  */
79 #define STABS_CURRENT_FILE(name)                                              \
80   STABS_CURRENT_FILE1 (#name)
81 #define STABS_CURRENT_FILE1(name)                                             \
82   1: .stabs name,100,0,0,1b;
83 /* Emit stabs definition lines.  We use F(0,1) and define t(0,1) as `int',
84    the same way gcc does it.  */
85 #define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1))
86 #define STABS_FUN2(name, namestr)                                             \
87   .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0;               \
88   .stabs #namestr,36,0,0,name;
89 #define STABS_FUN_END(name)                                                   \
90   1: .stabs "",36,0,0,1b-name;
91 #endif
92
93 /* If compiled for profiling, call `mcount' at the start of each function.  */
94 #ifdef  PROF
95 /* The mcount code relies on a normal frame pointer being on the stack
96    to locate our caller, so push one just for its benefit.  */
97 #define CALL_MCOUNT \
98   pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \
99   cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \
100   popl %ebp; cfi_def_cfa (esp, 4);
101 #else
102 #define CALL_MCOUNT             /* Do nothing.  */
103 #endif
104
105 #ifdef  NO_UNDERSCORES
106 /* Since C identifiers are not normally prefixed with an underscore
107    on this system, the asm identifier `syscall_error' intrudes on the
108    C name space.  Make sure we use an innocuous name.  */
109 #define syscall_error   __syscall_error
110 #define mcount          _mcount
111 #endif
112
113 #define PSEUDO(name, syscall_name, args)                                      \
114   .globl syscall_error;                                                       \
115 lose: SYSCALL_PIC_SETUP                                                       \
116   jmp JUMPTARGET(syscall_error);                                              \
117   ENTRY (name)                                                                \
118   DO_CALL (syscall_name, args);                                               \
119   jb lose
120
121 #undef  PSEUDO_END
122 #define PSEUDO_END(name)                                                      \
123   END (name)
124
125 #undef JUMPTARGET
126 #ifdef PIC
127 #define JUMPTARGET(name)        name##@PLT
128 #define SYSCALL_PIC_SETUP \
129     pushl %ebx;                                                               \
130     cfi_adjust_cfa_offset (4);                                                \
131     call 0f;                                                                  \
132 0:  popl %ebx;                                                                \
133     cfi_adjust_cfa_offset (-4);                                               \
134     addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
135
136 # define SETUP_PIC_REG(reg) \
137   .ifndef __i686.get_pc_thunk.reg;                                            \
138   .section .gnu.linkonce.t.__i686.get_pc_thunk.reg,"ax",@progbits;            \
139   .globl __i686.get_pc_thunk.reg;                                             \
140   .hidden __i686.get_pc_thunk.reg;                                            \
141   .type __i686.get_pc_thunk.reg,@function;                                    \
142 __i686.get_pc_thunk.reg:                                                      \
143   movl (%esp), %e##reg;                                                       \
144   ret;                                                                        \
145   .size __i686.get_pc_thunk.reg, . - __i686.get_pc_thunk.reg;                 \
146   .previous;                                                                  \
147   .endif;                                                                     \
148   call __i686.get_pc_thunk.reg
149
150 # define LOAD_PIC_REG(reg) \
151   SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg
152
153 #else
154 #define JUMPTARGET(name)        name
155 #define SYSCALL_PIC_SETUP       /* Nothing.  */
156 #endif
157
158 /* Local label name for asm code. */
159 #ifndef L
160 #ifdef HAVE_ELF
161 #define L(name)         .L##name
162 #else
163 #define L(name)         name
164 #endif
165 #endif
166
167 #endif  /* __ASSEMBLER__ */