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ae91d3df24
The syscall function does not allocate the extra stack frame for scv like other
assembly syscalls using DO_CALL_SCV. So after commit d120fb9941 changed the
offset that is used to save LR, syscall ended up using an invalid offset,
causing regressions on powerpc64. So make sure the extra stack frame is
allocated in syscall.S as well to make it consistent with other uses of
DO_CALL_SCV and avoid similar issues in the future.
Tested on powerpc, powerpc64, and powerpc64le (with and without scv)
Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
42 lines
1.2 KiB
ArmAsm
42 lines
1.2 KiB
ArmAsm
/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
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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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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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ENTRY (syscall)
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mr r0,r3
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mr r3,r4
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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#if defined(USE_PPC_SCV) && !IS_IN(rtld) && (defined(__PPC64__) || defined(__powerpc64__))
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CHECK_SCV_SUPPORT r9 0f
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stdu r1,-SCV_FRAME_SIZE(r1)
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cfi_adjust_cfa_offset(SCV_FRAME_SIZE)
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DO_CALL_SCV
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addi r1,r1,SCV_FRAME_SIZE
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cfi_adjust_cfa_offset(-SCV_FRAME_SIZE)
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RET_SCV
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b 1f
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#endif
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0: DO_CALL_SC
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RET_SC
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1: TAIL_CALL_SYSCALL_ERROR
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PSEUDO_END (syscall)
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