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87 lines
2.2 KiB
ArmAsm
87 lines
2.2 KiB
ArmAsm
/* Cancellable syscall wrapper. Linux/powerpc version.
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Copyright (C) 2023-2025 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <descr-const.h>
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/* long int [r3] __syscall_cancel_arch (int *cancelhandling [r3],
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long int nr [r4],
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long int arg1 [r5],
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long int arg2 [r6],
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long int arg3 [r7],
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long int arg4 [r8],
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long int arg5 [r9],
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long int arg6 [r10]) */
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ENTRY (__syscall_cancel_arch)
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.globl __syscall_cancel_arch_start
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__syscall_cancel_arch_start:
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/* if (*cancelhandling & CANCELED_BITMASK)
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__syscall_do_cancel() */
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lwz r0,0(r3)
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andi. r0,r0,TCB_CANCELED_BITMASK
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bne 1f
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/* Issue a 6 argument syscall, the nr [r4] being the syscall
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number. */
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mr r0,r4
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mr r3,r5
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mr r4,r6
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mr r5,r7
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mr r6,r8
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mr r7,r9
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mr r8,r10
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#if defined(USE_PPC_SVC) && 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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.machine "push"
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.machine "power9"
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scv 0
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.machine "pop"
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.globl __syscall_cancel_arch_end_svc
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__syscall_cancel_arch_end_svc:
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ld r9, SCV_FRAME_SIZE + FRAME_LR_SAVE(r1)
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mtlr r9
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addi r1, r1, SCV_FRAME_SIZE
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cfi_restore (lr)
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li r9, -4095
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cmpld r3, r9
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bnslr+
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neg r3,r3
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blr
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0:
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#endif
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sc
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.globl __syscall_cancel_arch_end_sc
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__syscall_cancel_arch_end_sc:
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bnslr+
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neg r3,r3
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blr
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/* Although the __syscall_do_cancel do not return, we need to stack
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being set correctly for unwind. */
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1:
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TAIL_CALL_NO_RETURN (__syscall_do_cancel)
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END (__syscall_cancel_arch)
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