diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h new file mode 100644 index 0000000000..4be2259878 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h @@ -0,0 +1,134 @@ +/* Copyright (C) 2003-2017 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 + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <tls.h> +#ifndef __ASSEMBLER__ +# include <nptl/pthreadP.h> +#endif + +#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt) + +# undef PSEUDO +# define PSEUDO(name, syscall_name, args) \ + .section ".text"; \ +ENTRY (__##syscall_name##_nocancel); \ +.Lpseudo_nocancel: \ + DO_CALL (syscall_name, args); \ +.Lpseudo_finish: \ + cmn x0, 4095; \ + b.cs .Lsyscall_error; \ + .subsection 2; \ + .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ +ENTRY (name); \ + SINGLE_THREAD_P(16); \ + cbz w16, .Lpseudo_nocancel; \ + /* Setup common stack frame no matter the number of args. \ + Also save the first arg, since it's basically free. */ \ + stp x30, x0, [sp, -64]!; \ + cfi_adjust_cfa_offset (64); \ + cfi_rel_offset (x30, 0); \ + DOCARGS_##args; /* save syscall args around CENABLE. */ \ + CENABLE; \ + mov x16, x0; /* save mask around syscall. */ \ + UNDOCARGS_##args; /* restore syscall args. */ \ + DO_CALL (syscall_name, args); \ + str x0, [sp, 8]; /* save result around CDISABLE. */ \ + mov x0, x16; /* restore mask for CDISABLE. */ \ + CDISABLE; \ + /* Break down the stack frame, restoring result at once. */ \ + ldp x30, x0, [sp], 64; \ + cfi_adjust_cfa_offset (-64); \ + cfi_restore (x30); \ + b .Lpseudo_finish; \ + cfi_endproc; \ + .size name, .-name; \ + .previous + +# undef PSEUDO_END +# define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER; \ + cfi_endproc + +# define DOCARGS_0 +# define DOCARGS_1 +# define DOCARGS_2 str x1, [sp, 16] +# define DOCARGS_3 stp x1, x2, [sp, 16] +# define DOCARGS_4 DOCARGS_3; str x3, [sp, 32] +# define DOCARGS_5 DOCARGS_3; stp x3, x4, [sp, 32] +# define DOCARGS_6 DOCARGS_5; str x5, [sp, 48] + +# define UNDOCARGS_0 +# define UNDOCARGS_1 ldr x0, [sp, 8] +# define UNDOCARGS_2 ldp x0, x1, [sp, 8] +# define UNDOCARGS_3 UNDOCARGS_1; ldp x1, x2, [sp, 16] +# define UNDOCARGS_4 UNDOCARGS_2; ldp x2, x3, [sp, 24] +# define UNDOCARGS_5 UNDOCARGS_3; ldp x3, x4, [sp, 32] +# define UNDOCARGS_6 UNDOCARGS_4; ldp x4, x5, [sp, 40] + +# if IS_IN (libpthread) +# define CENABLE bl __pthread_enable_asynccancel +# define CDISABLE bl __pthread_disable_asynccancel +# define __local_multiple_threads __pthread_multiple_threads +# elif IS_IN (libc) +# define CENABLE bl __libc_enable_asynccancel +# define CDISABLE bl __libc_disable_asynccancel +# define __local_multiple_threads __libc_multiple_threads +# elif IS_IN (librt) +# define CENABLE bl __librt_enable_asynccancel +# define CDISABLE bl __librt_disable_asynccancel +# else +# error Unsupported library +# endif + +# if IS_IN (libpthread) || IS_IN (libc) +# ifndef __ASSEMBLER__ +extern int __local_multiple_threads attribute_hidden; +# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1) +# else +# define SINGLE_THREAD_P(R) \ + adrp x##R, __local_multiple_threads; \ + ldr w##R, [x##R, :lo12:__local_multiple_threads] +# endif +# else +/* There is no __local_multiple_threads for librt, so use the TCB. */ +# ifndef __ASSEMBLER__ +# define SINGLE_THREAD_P \ + __builtin_expect (THREAD_GETMEM (THREAD_SELF, \ + header.multiple_threads) == 0, 1) +# else +# define SINGLE_THREAD_P(R) \ + mrs x##R, tpidr_el0; \ + sub x##R, x##R, PTHREAD_SIZEOF; \ + ldr w##R, [x##R, PTHREAD_MULTIPLE_THREADS_OFFSET] +# endif +# endif + +#elif !defined __ASSEMBLER__ + +/* For rtld, et cetera. */ +# define SINGLE_THREAD_P 1 +# define NO_CANCELLATION 1 + +#endif + +#ifndef __ASSEMBLER__ +# define RTLD_SINGLE_THREAD_P \ + __builtin_expect (THREAD_GETMEM (THREAD_SELF, \ + header.multiple_threads) == 0, 1) +#endif |