OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [config/] [mmix/] [crti.asm] - Blame information for rev 154

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 38 julius
/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
2
   Contributed by Hans-Peter Nilsson 
3
 
4
This file is free software; you can redistribute it and/or modify it
5
under the terms of the GNU General Public License as published by the
6
Free Software Foundation; either version 2, or (at your option) any
7
later version.
8
 
9
In addition to the permissions in the GNU General Public License, the
10
Free Software Foundation gives you unlimited permission to link the
11
compiled version of this file into combinations with other programs,
12
and to distribute those combinations without any restriction coming
13
from the use of this file.  (The General Public License restrictions
14
do apply in other respects; for example, they cover modification of
15
the file, and distribution when not linked into a combine
16
executable.)
17
 
18
This file is distributed in the hope that it will be useful, but
19
WITHOUT ANY WARRANTY; without even the implied warranty of
20
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21
General Public License for more details.
22
 
23
You should have received a copy of the GNU General Public License
24
along with this program; see the file COPYING.  If not, write to
25
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26
Boston, MA 02110-1301, USA.  */
27
 
28
% This is the crt0 equivalent for mmix-knuth-mmixware, for setting up
29
% things for compiler-generated assembly-code and for setting up things
30
% between where the simulator calls and main, and shutting things down on
31
% the way back.  There's an actual crt0.o elsewhere, but that's a dummy.
32
 
33
% This file and the GCC output are supposed to be *reasonably*
34
% mmixal-compatible to enable people to re-use output with Knuth's mmixal.
35
% However, forward references are used more freely: we are using the
36
% binutils tools.  Users of mmixal beware; you will sometimes have to
37
% re-order things or use temporary variables.
38
 
39
% Users of mmixal will want to set up 8H and 9H to be .text and .data
40
% respectively, so the compiler can switch between them pretending they're
41
% segments.
42
 
43
% This little treasure is here so the 32 lowest address bits of user data
44
% will not be zero.  Because of truncation, that would cause testcase
45
% gcc.c-torture/execute/980701-1.c to incorrectly fail.
46
 
47
        .data   ! mmixal:= 8H LOC Data_Segment
48
        .p2align 3
49
        LOC @+(8-@)@7
50
        OCTA 2009
51
 
52
        .text   ! mmixal:= 9H LOC 8B; LOC #100
53
        .global Main
54
 
55
% The __Stack_start symbol is provided by the link script.
56
stackpp OCTA __Stack_start
57
 
58
% "Main" is the magic symbol the simulator jumps to.  We want to go
59
% on to "main".
60
% We need to set rG explicitly to avoid hard-to-debug situations.
61
Main    SETL    $255,32
62
        PUT     rG,$255
63
 
64
% Initialize the stack pointer.  It is supposedly made a global
65
% zero-initialized (allowed to change) register in crtn.asm; we use the
66
% explicit number.
67
        GETA    $255,stackpp
68
        LDOU    $254,$255,0
69
 
70
% Make sure we get more than one mem, to simplify counting cycles.
71
        LDBU    $255,$1,0
72
        LDBU    $255,$1,1
73
 
74
        PUSHJ   $2,_init
75
 
76
#ifdef __MMIX_ABI_GNU__
77
% Copy argc and argv from their initial position to argument registers
78
% where necessary.
79
        SET     $231,$0
80
        SET     $232,$1
81
#else
82
% For the mmixware ABI, we need to move arguments.  The return value will
83
% appear in $0.
84
        SET     $2,$1
85
        SET     $1,$0
86
#endif
87
 
88
        PUSHJ   $0,main
89
        JMP     exit
90
 
91
% Provide the first part of _init and _fini.  Save the return address on the
92
% register stack.  We eventually ignore the return address of these
93
% PUSHJ:s, so it doesn't matter that whether .init and .fini code calls
94
% functions or where they store rJ.  We shouldn't get there, so die
95
% (TRAP Halt) if that happens.
96
 
97
        .section .init,"ax",@progbits
98
        .global _init
99
_init:
100
        GET     $0,:rJ
101
        PUSHJ   $1,0F
102
        SETL    $255,255
103
        TRAP    0,0,0
104
0H      IS      @
105
 
106
% Register _fini to be executed as the last atexit function.
107
#ifdef __MMIX_ABI_GNU__
108
        GETA    $231,_fini
109
#else
110
        GETA    $1,_fini
111
#endif
112
        PUSHJ   $0,atexit
113
 
114
        .section .fini,"ax",@progbits
115
        .global _fini
116
_fini:
117
        GET     $0,:rJ
118
        PUSHJ   $1,0F
119
        SETL    $255,255
120
        TRAP    0,0,0
121
0H      IS      @

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.