diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/sysdep-cancel.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/sysdep-cancel.h | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h b/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h new file mode 100644 index 0000000000..118e6c3466 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h @@ -0,0 +1,242 @@ +/* Copyright (C) 2003-2014 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 !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt + +/* NOTE: We do mark syscalls with unwind annotations, for the benefit of + cancellation; but they're really only accurate at the point of the + syscall. The ARM unwind directives are not rich enough without adding + a custom personality function. */ + +# undef PSEUDO +# define PSEUDO(name, syscall_name, args) \ + .text; \ + ENTRY (__##syscall_name##_nocancel); \ + CFI_SECTIONS; \ + DO_CALL (syscall_name, args); \ + cmn r0, $4096; \ + PSEUDO_RET; \ + END (__##syscall_name##_nocancel); \ + ENTRY (name); \ + SINGLE_THREAD_P; \ + DOARGS_##args; \ + bne .Lpseudo_cancel; \ + cfi_remember_state; \ + ldr r7, =SYS_ify (syscall_name); \ + swi 0x0; \ + UNDOARGS_##args; \ + cmn r0, $4096; \ + PSEUDO_RET; \ + cfi_restore_state; \ + .Lpseudo_cancel: \ + .fnstart; /* matched by the .fnend in UNDOARGS below. */ \ + DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \ + CENABLE; \ + mov ip, r0; /* put mask in safe place. */ \ + UNDOCARGS_##args; /* restore syscall args. */ \ + ldr r7, =SYS_ify (syscall_name); \ + swi 0x0; /* do the call. */ \ + mov r7, r0; /* save syscall return value. */ \ + mov r0, ip; /* get mask back. */ \ + CDISABLE; \ + mov r0, r7; /* retrieve return value. */ \ + RESTORE_LR_##args; \ + UNDOARGS_##args; \ + cmn r0, $4096 + +/* DOARGS pushes eight bytes on the stack for five arguments, twelve bytes for + six arguments, and four bytes for fewer. In order to preserve doubleword + alignment, sometimes we must save an extra register. */ + +# define RESTART_UNWIND \ + .fnend; \ + .fnstart; \ + .save {r7}; \ + .save {lr} + +# define DOCARGS_0 \ + .save {r7}; \ + push {lr}; \ + cfi_adjust_cfa_offset (4); \ + cfi_rel_offset (lr, 0); \ + .save {lr} +# define UNDOCARGS_0 +# define RESTORE_LR_0 \ + pop {lr}; \ + cfi_adjust_cfa_offset (-4); \ + cfi_restore (lr) + +# define DOCARGS_1 \ + .save {r7}; \ + push {r0, r1, lr}; \ + cfi_adjust_cfa_offset (12); \ + cfi_rel_offset (lr, 8); \ + .save {lr}; \ + .pad #8 +# define UNDOCARGS_1 \ + ldr r0, [sp], #8; \ + cfi_adjust_cfa_offset (-8); \ + RESTART_UNWIND +# define RESTORE_LR_1 \ + RESTORE_LR_0 + +# define DOCARGS_2 \ + .save {r7}; \ + push {r0, r1, lr}; \ + cfi_adjust_cfa_offset (12); \ + cfi_rel_offset (lr, 8); \ + .save {lr}; \ + .pad #8 +# define UNDOCARGS_2 \ + pop {r0, r1}; \ + cfi_adjust_cfa_offset (-8); \ + RESTART_UNWIND +# define RESTORE_LR_2 \ + RESTORE_LR_0 + +# define DOCARGS_3 \ + .save {r7}; \ + push {r0, r1, r2, r3, lr}; \ + cfi_adjust_cfa_offset (20); \ + cfi_rel_offset (lr, 16); \ + .save {lr}; \ + .pad #16 +# define UNDOCARGS_3 \ + pop {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + RESTART_UNWIND +# define RESTORE_LR_3 \ + RESTORE_LR_0 + +# define DOCARGS_4 \ + .save {r7}; \ + push {r0, r1, r2, r3, lr}; \ + cfi_adjust_cfa_offset (20); \ + cfi_rel_offset (lr, 16); \ + .save {lr}; \ + .pad #16 +# define UNDOCARGS_4 \ + pop {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + RESTART_UNWIND +# define RESTORE_LR_4 \ + RESTORE_LR_0 + +/* r4 is only stmfd'ed for correct stack alignment. */ +# define DOCARGS_5 \ + .save {r4, r7}; \ + push {r0, r1, r2, r3, r4, lr}; \ + cfi_adjust_cfa_offset (24); \ + cfi_rel_offset (lr, 20); \ + .save {lr}; \ + .pad #20 +# define UNDOCARGS_5 \ + pop {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + .fnend; \ + .fnstart; \ + .save {r4, r7}; \ + .save {lr}; \ + .pad #4 +# define RESTORE_LR_5 \ + pop {r4, lr}; \ + cfi_adjust_cfa_offset (-8); \ + /* r4 will be marked as restored later. */ \ + cfi_restore (lr) + +# define DOCARGS_6 \ + .save {r4, r5, r7}; \ + push {r0, r1, r2, r3, lr}; \ + cfi_adjust_cfa_offset (20); \ + cfi_rel_offset (lr, 16); \ + .save {lr}; \ + .pad #16 +# define UNDOCARGS_6 \ + pop {r0, r1, r2, r3}; \ + cfi_adjust_cfa_offset (-16); \ + .fnend; \ + .fnstart; \ + .save {r4, r5, r7}; \ + .save {lr}; +# define RESTORE_LR_6 \ + RESTORE_LR_0 + +# ifdef IS_IN_libpthread +# define CENABLE bl PLTJMP(__pthread_enable_asynccancel) +# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel) +# define __local_multiple_threads __pthread_multiple_threads +# elif !defined NOT_IN_libc +# define CENABLE bl PLTJMP(__libc_enable_asynccancel) +# define CDISABLE bl PLTJMP(__libc_disable_asynccancel) +# define __local_multiple_threads __libc_multiple_threads +# elif defined IS_IN_librt +# define CENABLE bl PLTJMP(__librt_enable_asynccancel) +# define CDISABLE bl PLTJMP(__librt_disable_asynccancel) +# else +# error Unsupported library +# endif + +# if defined IS_IN_libpthread || !defined NOT_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 \ + LDST_PCREL(ldr, ip, ip, __local_multiple_threads); \ + teq ip, #0 +# 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 \ + push {r0, lr}; \ + cfi_adjust_cfa_offset (8); \ + cfi_rel_offset (lr, 4); \ + GET_TLS (lr); \ + NEGOFF_ADJ_BASE (r0, MULTIPLE_THREADS_OFFSET); \ + ldr ip, NEGOFF_OFF1 (r0, MULTIPLE_THREADS_OFFSET); \ + pop {r0, lr}; \ + cfi_adjust_cfa_offset (-8); \ + cfi_restore (lr); \ + teq ip, #0 +# define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P +# 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 |