source: mainline/uspace/lib/c/arch/arm32/src/entryjmp.c@ eb630cf

ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since eb630cf was eb630cf, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 3 years ago

Fix handling of ABS32 relocation on arm32

A bad symbol reference in entryjmp.S was creating
an ABS32 relocation causing issues for dynamic
linker, leading to the ABS32 relocation being
generally ignored. However, that was not the
correct solution, as doing so breaks stacktrace
code (which emits global function pointers in
static data, creating ABS32 relocs).

The symbol reference in entryjmp.S was fixed by
converting the function to inline assembly, let
GCC deal with variable addresses.

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 * Copyright (c) 2008 Jiri Svoboda
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <entry_point.h>
30#include "ras_page.h"
31
32void entry_point_jmp(void *entry_point, void *pcb)
33{
34 asm volatile (
35 "mov r1, %0 \n"
36 "mov r2, %1 \n"
37 "mov r15, %2 \n"
38 :
39 : "r"(pcb), "r"(ras_page), "r"(entry_point)
40 : "r1", "r2"
41 );
42
43 __builtin_unreachable();
44}
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