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86 lines
2.2 KiB
ArmAsm
86 lines
2.2 KiB
ArmAsm
/* The clone3 syscall wrapper. Linux/aarch64 version.
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Copyright (C) 2023-2024 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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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* The userland implementation is:
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int clone3 (struct clone_args *cl_args, size_t size,
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int (*func)(void *arg), void *arg);
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the kernel entry is:
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int clone3 (struct clone_args *cl_args, size_t size);
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The parameters are passed in registers from userland:
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x0: cl_args
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x1: size
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x2: func
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x3: arg */
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.text
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ENTRY(__clone3)
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PTR_ARG (0)
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PTR_ARG (1)
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PTR_ARG (3)
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PTR_ARG (4)
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/* Save args for the child. */
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mov x10, x0 /* cl_args */
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mov x11, x2 /* func */
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mov x12, x3 /* args */
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/* Sanity check args. */
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mov x0, #-EINVAL
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cbz x10, .Lsyscall_error /* No NULL cl_args pointer. */
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cbz x2, .Lsyscall_error /* No NULL function pointer. */
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/* Do the system call, the kernel expects:
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x8: system call number
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x0: cl_args
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x1: size */
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mov x0, x10
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mov x8, #SYS_ify(clone3)
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svc 0x0
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cmp x0, #0
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beq thread_start
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blt .Lsyscall_error
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RET
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PSEUDO_END (__clone3)
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.align 4
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.type thread_start, %function
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thread_start:
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cfi_startproc
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cfi_undefined (x30)
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mov x29, 0
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/* Pick the function arg and execute. */
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mov x0, x12
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blr x11
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/* We are done, pass the return value through x0. */
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mov x8, #SYS_ify(exit)
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svc 0x0
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cfi_endproc
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.size thread_start, .-thread_start
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libc_hidden_def (__clone3)
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weak_alias (__clone3, clone3)
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