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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] riscv: Add the clone3 wrapper Date: Mon, 29 May 2023 20:50:17 +0000 (GMT) [thread overview] Message-ID: <20230529205017.3B1DE385840E@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a1950a07583f63f220f30ba7d99ceb619b80ecce commit a1950a07583f63f220f30ba7d99ceb619b80ecce Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Tue Sep 27 23:49:24 2022 -0300 riscv: Add the clone3 wrapper 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> Diff: --- sysdeps/unix/sysv/linux/riscv/clone3.S | 79 ++++++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/riscv/sysdep.h | 1 + 2 files changed, 80 insertions(+) diff --git a/sysdeps/unix/sysv/linux/riscv/clone3.S b/sysdeps/unix/sysv/linux/riscv/clone3.S new file mode 100644 index 0000000000..0ed9fd0745 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/clone3.S @@ -0,0 +1,79 @@ +/* The clone3 syscall wrapper. Linux/RISC-V version. + Copyright (C) 2023 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <asm/errno.h> +#include <sys/asm.h> +#include <sysdep.h> + +/* The userland implementation is: + int clone3 (struct clone_args *cl_args, size_t size, + int (*func)(void *arg), void *arg); + + the kernel entry is: + int clone3 (struct clone_args *cl_args, size_t size); + + The parameters are passed in registers from userland: + a0: cl_args + a1: size + a2: func + a3: arg */ + + .text +ENTRY(__clone3) + /* Sanity check args. */ + beqz a0, L(invalid) /* No NULL cl_args pointer. */ + beqz a2, L(invalid) /* No NULL function pointer. */ + + /* Do the system call, the kernel expects: + a7: system call number + a0: cl_args + a1: size */ + li a7, __NR_clone3 + scall + + bltz a0, L(error) + beqz a0, L(thread_start) + + ret + +L(invalid): + li a0, -EINVAL +L(error): + tail __syscall_error +END (__clone3) + +ENTRY(__thread_start_clone3) +L(thread_start): + /* Terminate call stack by noting ra is undefined. Use a dummy + .cfi_label to force starting the FDE. */ + .cfi_label .Ldummy + cfi_undefined (ra) + + /* Restore the arg for user's function and call the user's + function. */ + mv a0, a3 /* Argument pointer. */ + jalr a2 + + /* Call exit with the function's return value. */ + li a7, __NR_exit + scall +END(__thread_start_clone3) + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h index 872c093cfa..5583b96d23 100644 --- a/sysdeps/unix/sysv/linux/riscv/sysdep.h +++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h @@ -151,6 +151,7 @@ /* RV32 does not support the gettime VDSO syscalls. */ # endif +# define HAVE_CLONE3_WRAPPER 1 /* List of system calls which are supported as vsyscalls (for RV32 and RV64). */
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