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linux: Add sparck brk implementation

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It turned that the generic implementation of brk() does not work
for sparc, since on failure kernel will just return the previous
input value without setting the conditional register.

This patches adds back a sparc32 and sparc64 implementation removed
by 720480934a.

Checked on sparc64-linux-gnu and sparcv9-linux-gnu.

(cherry picked from commit 5b86241a03)
This commit is contained in:
Adhemerval Zanella 2021-08-04 21:34:12 +03:00 committed by Aurelien Jarno
parent e94544c82f
commit 1d9764aba8
1 changed files with 58 additions and 0 deletions
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58
sysdeps/unix/sysv/linux/sparc/brk.c Normal file
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/* Change data segment. Linux SPARC version.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
/* This must be initialized data because commons can't have aliases. */
void *__curbrk = 0;
#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux ELF dynamic
linker. */
weak_alias (__curbrk, ___brk_addr)
#endif
#ifdef __arch64__
# define SYSCALL_NUM "0x6d"
#else
# define SYSCALL_NUM "0x10"
#endif
int
__brk (void *addr)
{
register long int g1 asm ("g1") = __NR_brk;
register long int o0 asm ("o0") = (long int) addr;
asm volatile ("ta " SYSCALL_NUM
: "=r"(o0)
: "r"(g1), "0"(o0)
: "cc");
__curbrk = (void *) o0;
if (__curbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)