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105 lines
2.7 KiB
ArmAsm
105 lines
2.7 KiB
ArmAsm
/* Cancellable syscall wrapper. Linux/i686 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 [eax] __syscall_cancel_arch (int *cancelhandling [SP],
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long int nr [SP+4],
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long int arg1 [SP+8],
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long int arg2 [SP+12],
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long int arg3 [SP+16],
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long int arg4 [SP+20],
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long int arg5 [SP+24],
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long int arg6 [SP+28]) */
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ENTRY (__syscall_cancel_arch)
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pushl %ebp
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cfi_def_cfa_offset (8)
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cfi_offset (ebp, -8)
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pushl %edi
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cfi_def_cfa_offset (12)
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cfi_offset (edi, -12)
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pushl %esi
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cfi_def_cfa_offset (16)
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cfi_offset (esi, -16)
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pushl %ebx
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cfi_def_cfa_offset (20)
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cfi_offset (ebx, -20)
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.global __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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movl 20(%esp), %eax
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testb $TCB_CANCELED_BITMASK, (%eax)
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jne 1f
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/* Issue a 6 argument syscall, the nr [%eax] being the syscall
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number. */
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movl 24(%esp), %eax
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movl 28(%esp), %ebx
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movl 32(%esp), %ecx
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movl 36(%esp), %edx
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movl 40(%esp), %esi
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movl 44(%esp), %edi
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movl 48(%esp), %ebp
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/* We can not use the vDSO helper for syscall (__kernel_vsyscall)
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because the returned PC from kernel will point to the vDSO page
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instead of the expected __syscall_cancel_arch_{start,end}
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marks. */
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int $0x80
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.global __syscall_cancel_arch_end
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__syscall_cancel_arch_end:
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popl %ebx
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cfi_restore (ebx)
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cfi_def_cfa_offset (16)
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popl %esi
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cfi_restore (esi)
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cfi_def_cfa_offset (12)
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popl %edi
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cfi_restore (edi)
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cfi_def_cfa_offset (8)
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popl %ebp
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cfi_restore (ebp)
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cfi_def_cfa_offset (4)
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ret
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1:
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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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popl %ebx
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cfi_restore (ebx)
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cfi_def_cfa_offset (16)
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popl %esi
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cfi_restore (esi)
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cfi_def_cfa_offset (12)
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popl %edi
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cfi_restore (edi)
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cfi_def_cfa_offset (8)
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popl %ebp
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cfi_restore (ebp)
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cfi_def_cfa_offset (4)
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jmp __syscall_do_cancel
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END (__syscall_cancel_arch)
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