Message ID | 20230203171237.1220878-6-adhemerval.zanella@linaro.org |
---|---|
State | New |
Headers | show |
Series | Add clone3 support for multiple architectures | expand |
Ping. On 03/02/23 14:12, Adhemerval Zanella wrote: > It follows the internal signature: > > extern int clone3 (struct clone_args *__cl_args, size_t __size, > int (*__func) (void *__arg), void *__arg); > > Checked on mips64el-linux-gnueabihf and mipsel-linux-gnu. > --- > sysdeps/unix/sysv/linux/mips/clone3.S | 139 ++++++++++++++++++++++++++ > sysdeps/unix/sysv/linux/mips/sysdep.h | 2 + > 2 files changed, 141 insertions(+) > create mode 100644 sysdeps/unix/sysv/linux/mips/clone3.S > > diff --git a/sysdeps/unix/sysv/linux/mips/clone3.S b/sysdeps/unix/sysv/linux/mips/clone3.S > new file mode 100644 > index 0000000000..492d6d8b77 > --- /dev/null > +++ b/sysdeps/unix/sysv/linux/mips/clone3.S > @@ -0,0 +1,139 @@ > +/* The clone3 syscall wrapper. Linux/mips 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 <sys/asm.h> > +#include <sysdep.h> > +#define _ERRNO_H 1 > +#include <bits/errno.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/$4: cl_args > + a1/$5: size > + a2/$6: func > + a3/$7: arg */ > + > + .text > + .set nomips16 > +#if _MIPS_SIM == _ABIO32 > +# define EXTRA_LOCALS 1 > +#else > +# define EXTRA_LOCALS 0 > +#endif > +#define FRAMESZ ((NARGSAVE*SZREG)+ALSZ)&ALMASK > +GPOFF= FRAMESZ-(1*SZREG) > +NESTED(__clone3, SZREG, sp) > +#ifdef __PIC__ > + SETUP_GP > +#endif > +#if FRAMESZ > + PTR_SUBU sp, FRAMESZ > + cfi_adjust_cfa_offset (FRAMESZ) > +#endif > + SETUP_GP64_STACK (GPOFF, __clone) > +#ifdef __PIC__ > + SAVE_GP (GPOFF) > +#endif > +#ifdef PROF > + .set noat > + move $1,ra > + jal _mcount > + .set at > +#endif > + > + /* Sanity check args. */ > + li v0, EINVAL > + beqz a0, L(error) /* No NULL cl_args pointer. */ > + beqz a2, L(error) /* No NULL function pointer. */ > + > + move $8, a3 /* a3 is set to 0/1 for syscall success/error > + while a4/$8 is returned unmodified. */ > + > + /* Do the system call, the kernel expects: > + v0: system call number > + a0: cl_args > + a1: size */ > + li v0, __NR_clone3 > + cfi_endproc > + syscall > + > + bnez a3, L(error) > + beqz v0, L(thread_start_clone3) > + > + /* Successful return from the parent */ > + cfi_startproc > +#if FRAMESZ > + cfi_adjust_cfa_offset (FRAMESZ) > +#endif > + SETUP_GP64_STACK_CFI (GPOFF) > + cfi_remember_state > + RESTORE_GP64_STACK > +#if FRAMESZ > + PTR_ADDU sp, FRAMESZ > + cfi_adjust_cfa_offset (-FRAMESZ) > +#endif > + ret > + > +L(error): > + cfi_restore_state > +#ifdef __PIC__ > + PTR_LA t9,__syscall_error > + RESTORE_GP64_STACK > + PTR_ADDU sp, FRAMESZ > + cfi_adjust_cfa_offset (-FRAMESZ) > + jr t9 > +#else > + RESTORE_GP64_STACK > + PTR_ADDU sp, FRAMESZ > + cfi_adjust_cfa_offset (-FRAMESZ) > + j __syscall_error > +#endif > +END (__clone3) > + > +/* Load up the arguments to the function. Put this block of code in > + its own function so that we can terminate the stack trace with our > + debug info. */ > + > +ENTRY(__thread_start_clone3) > +L(thread_start_clone3): > + cfi_undefined ($31) > + /* cp is already loaded. */ > + SAVE_GP (GPOFF) > + /* The stackframe has been created on entry of clone3. */ > + > + /* Restore the arg for user's function. */ > + move t9, a2 /* Function pointer. */ > + move a0, $8 /* Argument pointer. */ > + > + /* Call the user's function. */ > + jal t9 > + > + move a0, v0 > + li v0, __NR_exit > + syscall > +END(__thread_start_clone3) > + > +libc_hidden_def (__clone3) > +weak_alias (__clone3, clone3) > diff --git a/sysdeps/unix/sysv/linux/mips/sysdep.h b/sysdeps/unix/sysv/linux/mips/sysdep.h > index ff84a91b31..673aa08b57 100644 > --- a/sysdeps/unix/sysv/linux/mips/sysdep.h > +++ b/sysdeps/unix/sysv/linux/mips/sysdep.h > @@ -28,3 +28,5 @@ > #endif > #define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday" > #define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres" > + > +#define HAVE_CLONE3_WRAPPER 1
diff --git a/sysdeps/unix/sysv/linux/mips/clone3.S b/sysdeps/unix/sysv/linux/mips/clone3.S new file mode 100644 index 0000000000..492d6d8b77 --- /dev/null +++ b/sysdeps/unix/sysv/linux/mips/clone3.S @@ -0,0 +1,139 @@ +/* The clone3 syscall wrapper. Linux/mips 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 <sys/asm.h> +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.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/$4: cl_args + a1/$5: size + a2/$6: func + a3/$7: arg */ + + .text + .set nomips16 +#if _MIPS_SIM == _ABIO32 +# define EXTRA_LOCALS 1 +#else +# define EXTRA_LOCALS 0 +#endif +#define FRAMESZ ((NARGSAVE*SZREG)+ALSZ)&ALMASK +GPOFF= FRAMESZ-(1*SZREG) +NESTED(__clone3, SZREG, sp) +#ifdef __PIC__ + SETUP_GP +#endif +#if FRAMESZ + PTR_SUBU sp, FRAMESZ + cfi_adjust_cfa_offset (FRAMESZ) +#endif + SETUP_GP64_STACK (GPOFF, __clone) +#ifdef __PIC__ + SAVE_GP (GPOFF) +#endif +#ifdef PROF + .set noat + move $1,ra + jal _mcount + .set at +#endif + + /* Sanity check args. */ + li v0, EINVAL + beqz a0, L(error) /* No NULL cl_args pointer. */ + beqz a2, L(error) /* No NULL function pointer. */ + + move $8, a3 /* a3 is set to 0/1 for syscall success/error + while a4/$8 is returned unmodified. */ + + /* Do the system call, the kernel expects: + v0: system call number + a0: cl_args + a1: size */ + li v0, __NR_clone3 + cfi_endproc + syscall + + bnez a3, L(error) + beqz v0, L(thread_start_clone3) + + /* Successful return from the parent */ + cfi_startproc +#if FRAMESZ + cfi_adjust_cfa_offset (FRAMESZ) +#endif + SETUP_GP64_STACK_CFI (GPOFF) + cfi_remember_state + RESTORE_GP64_STACK +#if FRAMESZ + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) +#endif + ret + +L(error): + cfi_restore_state +#ifdef __PIC__ + PTR_LA t9,__syscall_error + RESTORE_GP64_STACK + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) + jr t9 +#else + RESTORE_GP64_STACK + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) + j __syscall_error +#endif +END (__clone3) + +/* Load up the arguments to the function. Put this block of code in + its own function so that we can terminate the stack trace with our + debug info. */ + +ENTRY(__thread_start_clone3) +L(thread_start_clone3): + cfi_undefined ($31) + /* cp is already loaded. */ + SAVE_GP (GPOFF) + /* The stackframe has been created on entry of clone3. */ + + /* Restore the arg for user's function. */ + move t9, a2 /* Function pointer. */ + move a0, $8 /* Argument pointer. */ + + /* Call the user's function. */ + jal t9 + + move a0, v0 + li v0, __NR_exit + syscall +END(__thread_start_clone3) + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/mips/sysdep.h b/sysdeps/unix/sysv/linux/mips/sysdep.h index ff84a91b31..673aa08b57 100644 --- a/sysdeps/unix/sysv/linux/mips/sysdep.h +++ b/sysdeps/unix/sysv/linux/mips/sysdep.h @@ -28,3 +28,5 @@ #endif #define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday" #define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres" + +#define HAVE_CLONE3_WRAPPER 1