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a1950a0758
It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on riscv64-linux-gnu-rv64imafdc-lp64d. Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
80 lines
2.1 KiB
ArmAsm
80 lines
2.1 KiB
ArmAsm
/* The clone3 syscall wrapper. Linux/RISC-V version.
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Copyright (C) 2023 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 <asm/errno.h>
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#include <sys/asm.h>
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#include <sysdep.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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a0: cl_args
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a1: size
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a2: func
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a3: arg */
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.text
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ENTRY(__clone3)
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/* Sanity check args. */
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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, the kernel expects:
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a7: system call number
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a0: cl_args
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a1: size */
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li a7, __NR_clone3
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scall
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bltz a0, L(error)
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beqz a0, L(thread_start)
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ret
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L(invalid):
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li a0, -EINVAL
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L(error):
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tail __syscall_error
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END (__clone3)
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ENTRY(__thread_start_clone3)
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L(thread_start):
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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 (ra)
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/* Restore the arg for user's function and call the user's
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function. */
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mv a0, a3 /* Argument pointer. */
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jalr a2
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/* Call exit with the function's return value. */
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li a7, __NR_exit
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scall
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END(__thread_start_clone3)
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libc_hidden_def (__clone3)
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weak_alias (__clone3, clone3)
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