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1/* Special .init and .fini section support for HPPA
2 Copyright (C) 2000-2019 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 In addition to the permissions in the GNU Lesser General Public
11 License, the Free Software Foundation gives you unlimited
12 permission to link the compiled version of this file with other
13 programs, and to distribute those programs without any restriction
14 coming from the use of this file. (The GNU Lesser General Public
15 License restrictions do apply in other respects; for example, they
16 cover modification of the file, and distribution when not linked
17 into another program.)
18
19 Note that people who make modified versions of this file are not
20 obligated to grant this special exception for their modified
21 versions; it is their choice whether to do so. The GNU Lesser
22 General Public License gives permission to release a modified
23 version without this exception; this exception also makes it
24 possible to release a modified version which carries forward this
25 exception.
26
27 The GNU C Library is distributed in the hope that it will be useful,
28 but WITHOUT ANY WARRANTY; without even the implied warranty of
29 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 Lesser General Public License for more details.
31
32 You should have received a copy of the GNU Lesser General Public
33 License along with the GNU C Library. If not, see
34 <http://www.gnu.org/licenses/>. */
35
36/* crti.S puts a function prologue at the beginning of the .init and
37 .fini sections and defines global symbols for those addresses, so
38 they can be called as functions. The symbols _init and _fini are
39 magic and cause the linker to emit DT_INIT and DT_FINI. */
40
41#include <libc-symbols.h>
42#include <sysdep.h>
43
44#ifndef PREINIT_FUNCTION
45# define PREINIT_FUNCTION __gmon_start__
46#endif
47
48#ifndef PREINIT_FUNCTION_WEAK
49# define PREINIT_FUNCTION_WEAK 1
50#endif
51
52#if PREINIT_FUNCTION_WEAK
53 weak_extern (PREINIT_FUNCTION)
54#else
55 .hidden PREINIT_FUNCTION
56#endif
57
58
59/* If we have working .init_array support, we want to keep the .init
60 section empty (apart from the mandatory prologue/epilogue. This
61 ensures that the default unwind conventions (return-pointer in b0,
62 frame state in ar.pfs, etc.) will do the Right Thing. To ensure
63 an empty .init section, we register gmon_initializer() via the
64 .init_array.
65
66 --davidm 02/10/29 */
67
68#if PREINIT_FUNCTION_WEAK
69/* This blob of assembly code is one simple C function:
70
71static void
72__attribute__ ((used))
73gmon_initializer (void)
74{
75 extern void weak_function __gmon_start__ (void);
76
77 if (__gmon_start__)
78 (*__gmon_start__)();
79}
80
81In a final executable, PLABEL32 relocations for function pointers are
82resolved at link time. Typically, binutils/ld resolves __gmon_start__
83using an external shared library. __gmon_start__ is always called if
84it is found at link time. If __gmon_start__ is not found at runtime
85due to a library update, then the function pointer will point at a null
86function descriptor and calling it will cause a segmentation fault.
87So, we call __canonicalize_funcptr_for_compare to obtain the canonicalized
88address of __gmon_start__ and skip calling __gmon_start__ if it is zero.
89
90 */
91 .type __canonicalize_funcptr_for_compare,@function
92 .type $$dyncall,@function
93
94 .section .data.rel.ro,"aw",@progbits
95 .align 4
96.LC0:
97 .type __gmon_start__,@function
98 .word P%__gmon_start__
99
100 .text
101 .align 4
102 .type gmon_initializer,@function
103gmon_initializer:
104 .PROC
105 .CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=4
106 .ENTRY
107 stw %r2,-20(%r30)
108 stwm %r4,64(%r30)
109 stw %r3,-60(%r30)
110 addil LT'.LC0,%r19
111 ldw RT'.LC0(%r1),%r28
112 ldw 0(%r28),%r3
113 comib,= 0,%r3,1f
114 copy %r19,%r4
115 stw %r19,-32(%r30)
116 bl __canonicalize_funcptr_for_compare,%r2
117 copy %r3,%r26
118 comib,= 0,%r28,1f
119 copy %r4,%r19
120 copy %r3,%r22
121 .CALL ARGW0=GR
122 bl $$dyncall,%r31
123 copy %r31,%r2
1241:
125 ldw -84(%r30),%r2
126 ldw -60(%r30),%r3
127 bv %r0(%r2)
128 ldwm -64(%r30),%r4
129 .EXIT
130 .PROCEND
131 .size gmon_initializer, .-gmon_initializer
132
133# undef PREINIT_FUNCTION
134# define PREINIT_FUNCTION gmon_initializer
135#endif
136
137 .section .init_array, "aw"
138 .word P% PREINIT_FUNCTION
139
140
141/* _init prologue. */
142 .section .init, "ax", %progbits
143 .align 4
144 .globl _init
145 .hidden _init
146 .type _init,@function
147_init:
148 stw %rp,-20(%sp)
149 stwm %r4,64(%sp)
150 stw %r19,-32(%sp)
151
152/* _fini prologue. */
153 .section .fini,"ax",%progbits
154 .align 4
155 .globl _fini
156 .hidden _fini
157 .type _fini,@function
158_fini:
159 stw %rp,-20(%sp)
160 stwm %r4,64(%sp)
161 stw %r19,-32(%sp)
162 copy %r19,%r4
163

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