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commit 1d9764aba8c00754fbf8299e48afbe222245ee3e
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Wed Aug 4 21:34:12 2021 +0300
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linux: Add sparck brk implementation
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It turned that the generic implementation of brk() does not work
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for sparc, since on failure kernel will just return the previous
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input value without setting the conditional register.
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This patches adds back a sparc32 and sparc64 implementation removed
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by 720480934ab9107.
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Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
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(cherry picked from commit 5b86241a032c50462988bdd1439e078384690d34)
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diff --git a/sysdeps/unix/sysv/linux/sparc/brk.c b/sysdeps/unix/sysv/linux/sparc/brk.c
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new file mode 100644
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index 0000000000000000..aafe9673e3062cf8
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/sparc/brk.c
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@@ -0,0 +1,58 @@
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+/* Change data segment. Linux SPARC version.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <errno.h>
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+#include <unistd.h>
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+#include <sysdep.h>
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+
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+/* This must be initialized data because commons can't have aliases. */
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+void *__curbrk = 0;
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+
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+#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
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+/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
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+ to work around different old braindamage in the old Linux ELF dynamic
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+ linker. */
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+weak_alias (__curbrk, ___brk_addr)
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+#endif
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+
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+#ifdef __arch64__
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+# define SYSCALL_NUM "0x6d"
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+#else
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+# define SYSCALL_NUM "0x10"
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+#endif
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+
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+int
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+__brk (void *addr)
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+{
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+ register long int g1 asm ("g1") = __NR_brk;
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+ register long int o0 asm ("o0") = (long int) addr;
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+ asm volatile ("ta " SYSCALL_NUM
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+ : "=r"(o0)
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+ : "r"(g1), "0"(o0)
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+ : "cc");
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+ __curbrk = (void *) o0;
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+
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+ if (__curbrk < addr)
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+ {
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+ __set_errno (ENOMEM);
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+weak_alias (__brk, brk)
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