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80 lines
1.9 KiB
ArmAsm
80 lines
1.9 KiB
ArmAsm
/* The clone3 syscall wrapper. Linux/arm 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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.text
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ENTRY(__clone3)
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/* Sanity check args. */
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cmp r0, #0
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ite ne
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cmpne r1, #0
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moveq r0, #-EINVAL
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beq PLTJMP(syscall_error)
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/* Do the syscall, the kernel expects:
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r7: system call number:
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r0: cl_args
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r1: size */
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push { r7 }
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r7, 0)
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ldr r7, =SYS_ify(clone3)
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swi 0x0
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cfi_endproc
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cmp r0, #0
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beq 1f
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pop {r7}
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blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
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RETINSTR(, lr)
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cfi_startproc
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PSEUDO_END (__clone3)
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1:
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.fnstart
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.cantunwind
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mov r0, r3
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mov ip, r2
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BLX (ip)
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/* And we are done, passing the return value through r0. */
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ldr r7, =SYS_ify(exit)
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swi 0x0
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.fnend
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libc_hidden_def (__clone3)
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