1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/* $NetBSD: execsp.S,v 1.1 2025/04/20 22:33:13 riastradh Exp $ */
/*-
* Copyright (c) 2025 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define _LOCORE
#include <machine/asm.h>
RCSID("$NetBSD: execsp.S,v 1.1 2025/04/20 22:33:13 riastradh Exp $")
/*
* void execsp_start(void (*cleanup@edx)(void), void *obj_main@ecx,
* struct ps_strings *ps_strings@ebx)
*
* ELF entry point. Saves the stack pointer in startsp and defers
* to the usual csu __start routine.
*/
ENTRY(execsp_start)
call getpc_eax
addl $_GLOBAL_OFFSET_TABLE_,%eax
movl _C_LABEL(startsp)@GOT(%eax),%eax
movl %esp,(%eax)
jmp _C_LABEL(__start)@PLT
END(execsp_start)
/*
* void execsp_ctor(void)
*
* ELF constructor. Saves the stack pointer in ctorsp and
* returns.
*/
ENTRY(execsp_ctor)
call getpc_eax
addl $_GLOBAL_OFFSET_TABLE_,%eax
movl _C_LABEL(ctorsp)@GOT(%eax),%eax
movl %esp,(%eax)
ret
END(execsp_ctor)
/* Make execsp_ctor a constructor. */
.section .ctors,"aw",@progbits
.p2align 2
.long _C_LABEL(execsp_ctor)
/*
* int main(int argc@rdi, char **argv@rsi, ...)
*
* Main function. Saves the stack pointer in mainsp and returns
* zero. We will call execsp_main in execsp_dtor once dtorsp has
* been initialized.
*/
ENTRY(main)
call getpc_eax
addl $_GLOBAL_OFFSET_TABLE_,%eax
movl _C_LABEL(mainsp)@GOT(%eax),%eax
movl %esp,(%eax)
xorl %eax,%eax
ret
END(main)
/*
* void execsp_dtor(void)
*
* ELF destructor. Saves the stack pointer in dtorsp and defers
* to the C execsp_main in h_execsp.c to report the stack pointers
* back to the t_signal_and_sp parent.
*/
ENTRY(execsp_dtor)
call getpc_eax
addl $_GLOBAL_OFFSET_TABLE_,%eax
movl _C_LABEL(dtorsp)@GOT(%eax),%eax
movl %esp,(%eax)
jmp _C_LABEL(execsp_main)@PLT
END(execsp_dtor)
/* Make execsp_ctor a destructor. */
.section .dtors,"aw",@progbits
.p2align 2
.long _C_LABEL(execsp_dtor)
.text
_ALIGN_TEXT
.local getpc_eax
.type getpc_eax,@function
getpc_eax:
movl (%esp),%eax
ret
END(getpc_eax)
|
