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84 lines
2.3 KiB
ArmAsm
84 lines
2.3 KiB
ArmAsm
/* The clone3 syscall wrapper.
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Copyright (C) 2022 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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/* clone3() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sys/asm.h>
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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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#include <tls.h>
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#include "tcb-offsets.h"
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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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ENTRY (__clone3)
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/* Sanity check arguments. */
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beqz a0, L (invalid) /* No NULL cl_args pointer. */
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beqz a2, L (invalid) /* No NULL function pointer. */
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/* Do the system call. */
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LI a7, __NR_clone3
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syscall 0
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blt a0, zero ,L (error)
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beqz a0, L (thread_start3)
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/* Successful return from the parent. */
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ret
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L (invalid):
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LI a0, -EINVAL
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/* Something bad happened -- no child created. */
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L (error):
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b __syscall_error
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END (__clone3)
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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debug info. */
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ENTRY (__thread_start3)
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L (thread_start3):
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/* Terminate call stack by noting ra is undefined. Use a dummy
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.cfi_label to force starting the FDE. */
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.cfi_label .Ldummy
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cfi_undefined (1)
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/* Align stack to 16. */
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BSTRINS sp, zero, 3, 0
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/* Set up arguments for the function call. */
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move a0, a3 /* Argument. */
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jirl ra, a2, 0 /* Call function. */
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/* Call exit with the function's return value. */
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LI a7, __NR_exit
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syscall 0
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END (__thread_start3)
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libc_hidden_def (__clone3)
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weak_alias (__clone3, clone3)
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