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43 lines
1.5 KiB
ArmAsm
43 lines
1.5 KiB
ArmAsm
/* Copyright (C) 2001-2020 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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/* Please consult the file sysdeps/unix/sysv/linux/x86-64/sysdep.h for
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more information about the value -4095 used below. */
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/* Usage: long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6)
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We need to do some arg shifting, the syscall_number will be in
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rax. */
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.text
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ENTRY (syscall)
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movq %rdi, %rax /* Syscall number -> rax. */
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movq %rsi, %rdi /* shift arg1 - arg5. */
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movq %rdx, %rsi
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movq %rcx, %rdx
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movq %r8, %r10
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movq %r9, %r8
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movq 8(%rsp),%r9 /* arg6 is on the stack. */
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syscall /* Do the system call. */
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cmpq $-4095, %rax /* Check %rax for error. */
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jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
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ret /* Return to caller. */
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PSEUDO_END (syscall)
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