2002-09-17 23:50:03 +00:00
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/* brk system call for Linux. PowerPC64 version.
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2017-01-01 00:14:16 +00:00
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Copyright (C) 1995-2017 Free Software Foundation, Inc.
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2002-09-17 23:50:03 +00:00
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This file is part of the GNU C Library.
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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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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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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2002-09-17 23:50:03 +00:00
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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.comm __curbrk,8,8
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2003-06-12 22:31:43 +00:00
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.section ".toc","aw"
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.LC__curbrk:
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.tc __curbrk[TC],__curbrk
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2002-09-17 23:50:03 +00:00
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.section ".text"
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2013-03-06 00:10:21 +00:00
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ENTRY (__brk)
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2004-12-14 21:25:41 +00:00
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CALL_MCOUNT 1
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2002-09-17 23:50:03 +00:00
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PowerPC64 ELFv2 ABI 4/6: Stack frame layout changes
This updates glibc for the changes in the ELFv2 relating to the
stack frame layout. These are described in more detail here:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01149.html
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01146.html
Specifically, the "compiler and linker doublewords" were removed,
which has the effect that the save slot for the TOC register is
now at offset 24 rather than 40 to the stack pointer.
In addition, a function may now no longer necessarily assume that
its caller has set up a 64-byte register save area its use.
To address the first change, the patch goes through all assembler
files and replaces immediate offsets in instructions accessing the
ABI-defined stack slots by symbolic offsets. Those already were
defined in ucontext_i.sym and used in some of the context routines,
but that doesn't really seem like the right place for those defines.
The patch instead defines those symbolic offsets in sysdeps.h,
in two variants for the old and new ABI, and uses them systematically
in all assembler files, not just the context routines.
The second change only affected a few assembler files that used
the save area to temporarily store some registers. In those
cases where this happens within a leaf function, this patch
changes the code to store those registers to the "red zone"
below the stack pointer. Otherwise, the functions already allocate
a stack frame, and the patch changes them to add extra space in
these frames as temporary space for the ELFv2 ABI.
2013-12-04 12:55:03 +00:00
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std r3,-8(r1)
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2002-09-17 23:50:03 +00:00
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DO_CALL(SYS_ify(brk))
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PowerPC64 ELFv2 ABI 4/6: Stack frame layout changes
This updates glibc for the changes in the ELFv2 relating to the
stack frame layout. These are described in more detail here:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01149.html
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01146.html
Specifically, the "compiler and linker doublewords" were removed,
which has the effect that the save slot for the TOC register is
now at offset 24 rather than 40 to the stack pointer.
In addition, a function may now no longer necessarily assume that
its caller has set up a 64-byte register save area its use.
To address the first change, the patch goes through all assembler
files and replaces immediate offsets in instructions accessing the
ABI-defined stack slots by symbolic offsets. Those already were
defined in ucontext_i.sym and used in some of the context routines,
but that doesn't really seem like the right place for those defines.
The patch instead defines those symbolic offsets in sysdeps.h,
in two variants for the old and new ABI, and uses them systematically
in all assembler files, not just the context routines.
The second change only affected a few assembler files that used
the save area to temporarily store some registers. In those
cases where this happens within a leaf function, this patch
changes the code to store those registers to the "red zone"
below the stack pointer. Otherwise, the functions already allocate
a stack frame, and the patch changes them to add extra space in
these frames as temporary space for the ELFv2 ABI.
2013-12-04 12:55:03 +00:00
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ld r6,-8(r1)
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2003-06-12 22:31:43 +00:00
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ld r5,.LC__curbrk@toc(r2)
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2002-09-17 23:50:03 +00:00
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std r3,0(r5)
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cmpld r6,r3
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li r3,0
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blelr+
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li r3,ENOMEM
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2010-08-12 16:19:19 +00:00
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TAIL_CALL_SYSCALL_ERROR
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2013-03-06 00:10:21 +00:00
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END (__brk)
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2002-09-17 23:50:03 +00:00
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2013-03-06 00:10:21 +00:00
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weak_alias (__brk, brk)
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