diff mbox series

linux: Add sparck brk implementation

Message ID 20210804203945.1559122-1-adhemerval.zanella@linaro.org
State Committed
Commit 5b86241a032c50462988bdd1439e078384690d34
Headers
Series linux: Add sparck brk implementation |

Checks

Context Check Description
dj/TryBot-apply_patch fail Patch failed to apply to master at the time it was sent
dj/TryBot-32bit fail Patch series failed to apply

Commit Message

Adhemerval Zanella Netto Aug. 4, 2021, 8:39 p.m. UTC 
  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 720480934ab9107.

Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
---
 sysdeps/unix/sysv/linux/sparc/brk.c | 58 +++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/sparc/brk.c

Comments

Adhemerval Zanella Netto Aug. 4, 2021, 8:41 p.m. UTC | #1 
On 04/08/2021 17:39, Adhemerval Zanella wrote:
> 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 720480934ab9107.
> 
> Checked on sparc64-linux-gnu and sparcv9-linux-gnu.

The subject was meant to be 'COMMITTED'.
diff mbox series

Patch

diff --git a/sysdeps/unix/sysv/linux/sparc/brk.c b/sysdeps/unix/sysv/linux/sparc/brk.c
new file mode 100644
index 0000000000..aafe9673e3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/brk.c
@@ -0,0 +1,58 @@ 
+/* 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)