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79 lines
2.1 KiB
ArmAsm
79 lines
2.1 KiB
ArmAsm
/* Cancellable syscall wrapper. Linux/arm 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 [r0] __syscall_cancel_arch (int *cancelhandling [r0],
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long int nr [r1],
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long int arg1 [r2],
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long int arg2 [r3],
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long int arg3 [SP],
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long int arg4 [SP+4],
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long int arg5 [SP+8],
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long int arg6 [SP+12]) */
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.syntax unified
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ENTRY (__syscall_cancel_arch)
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.fnstart
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mov ip, sp
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stmfd sp!, {r4, r5, r6, r7, lr}
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.save {r4, r5, r6, r7, lr}
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cfi_adjust_cfa_offset (20)
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cfi_rel_offset (r4, 0)
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cfi_rel_offset (r5, 4)
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cfi_rel_offset (r6, 8)
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cfi_rel_offset (r7, 12)
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cfi_rel_offset (lr, 16)
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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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ldr r0, [r0]
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tst r0, #TCB_CANCELED_BITMASK
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bne 1f
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/* Issue a 6 argument syscall, the nr [r1] being the syscall
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number. */
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mov r7, r1
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mov r0, r2
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mov r1, r3
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ldmfd ip, {r2, r3, r4, r5, r6}
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svc 0x0
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.globl __syscall_cancel_arch_end
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__syscall_cancel_arch_end:
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ldmfd sp!, {r4, r5, r6, r7, lr}
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cfi_adjust_cfa_offset (-20)
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cfi_restore (r4)
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cfi_restore (r5)
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cfi_restore (r6)
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cfi_restore (r7)
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cfi_restore (lr)
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BX (lr)
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1:
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ldmfd sp!, {r4, r5, r6, r7, lr}
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b __syscall_do_cancel
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.fnend
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END (__syscall_cancel_arch)
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