1 .. SPDX-License-Identifier: GPL-2.0
2
3 ==================================
4 x86-specific ELF Auxiliary Vectors
5 ==================================
6
7 This document describes the semantics of the x
8
9 Introduction
10 ============
11
12 ELF Auxiliary vectors enable the kernel to eff
13 configuration-specific parameters to userspace
14 allocates an alternate stack based on the kern
15
16 #include <sys/auxv.h>
17 #include <elf.h>
18 #include <signal.h>
19 #include <stdlib.h>
20 #include <assert.h>
21 #include <err.h>
22
23 #ifndef AT_MINSIGSTKSZ
24 #define AT_MINSIGSTKSZ 51
25 #endif
26
27 ....
28 stack_t ss;
29
30 ss.ss_sp = malloc(ss.ss_size);
31 assert(ss.ss_sp);
32
33 ss.ss_size = getauxval(AT_MINSIGSTKSZ) + SI
34 ss.ss_flags = 0;
35
36 if (sigaltstack(&ss, NULL))
37 err(1, "sigaltstack");
38
39
40 The exposed auxiliary vectors
41 =============================
42
43 AT_SYSINFO is used for locating the vsyscall e
44 exported on 64-bit mode.
45
46 AT_SYSINFO_EHDR is the start address of the pa
47
48 AT_MINSIGSTKSZ denotes the minimum stack size
49 deliver a signal to user-space. AT_MINSIGSTKS
50 consumed by the kernel to accommodate the user
51 hardware configuration. It does not comprehen
52 consumption, which must be added by the user.
53 SIGSTKSZ to AT_MINSIGSTKSZ.)
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