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90 lines
2.3 KiB
ArmAsm
90 lines
2.3 KiB
ArmAsm
/* The clone3 syscall wrapper. Linux/arc 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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<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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r0: cl_args
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r1: size
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r2: func
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r3: arg */
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ENTRY(__clone3)
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/* Save args for the child. */
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mov r10, r0 /* cl_args */
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mov r11, r2 /* func */
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mov r12, r3 /* args */
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/* Sanity check args. */
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breq r10, 0, L (__sys_err) /* No NULL cl_args pointer. */
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breq r11, 0, L (__sys_err) /* No NULL function pointer. */
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/* Do the system call, the kernel expects:
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r8: system call number
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r0: cl_args
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r1: size */
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mov r0, r10
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mov r8, __NR_clone3
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ARC_TRAP_INSN
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cmp r0, 0
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beq thread_start_clone3 /* Child returns. */
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blt L (__sys_err2)
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j [blink] /* Parent returns. */
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L (__sys_err):
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mov r0, -EINVAL
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L (__sys_err2):
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b __syscall_error
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PSEUDO_END (__clone3)
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.align 4
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.type thread_start_clone3, %function
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thread_start_clone3:
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cfi_startproc
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/* Terminate call stack by noting ra is undefined. */
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cfi_undefined (blink)
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/* Child jumps off to @fn with @arg as argument. */
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jl.d [r11]
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mov r0, r12
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/* exit() with result from @fn (already in r0). */
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mov r8, __NR_exit
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ARC_TRAP_INSN
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/* In case it ever came back. */
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flag 1
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cfi_endproc
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.size thread_start_clone3, .-thread_start_clone3
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libc_hidden_def (__clone3)
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