diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h new file mode 100644 index 000000000..350d9af50 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h @@ -0,0 +1,153 @@ +/* Copyright (C) 2003, 2004, 2005 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <tls.h> +#ifndef __ASSEMBLER__ +# include <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) \ + .section ".text"; \ + PSEUDO_PROLOGUE; \ + .type __##syscall_name##_nocancel,%function; \ + .globl __##syscall_name##_nocancel; \ + __##syscall_name##_nocancel: \ + DO_CALL (syscall_name, args); \ + PSEUDO_RET; \ + .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ + ENTRY (name); \ + SINGLE_THREAD_P; \ + DOARGS_##args; \ + bne .Lpseudo_cancel; \ + DO_CALL (syscall_name, 0); \ + UNDOARGS_##args; \ + cmn r0, $4096; \ + PSEUDO_RET; \ + .Lpseudo_cancel: \ + .fnstart; \ + 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. */ \ + .fnend; /* Past here we can't easily unwind. */ \ + 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 four bytes on the stack for five arguments, eight bytes for + six arguments, and nothing for fewer. In order to preserve doubleword + alignment, sometimes we must save an extra register. */ + +# define RESTART_UNWIND .fnend; .fnstart; .save {r7, lr} + +# define DOCARGS_0 stmfd sp!, {r7, lr}; .save {r7, lr} +# define UNDOCARGS_0 +# define RESTORE_LR_0 ldmfd sp!, {r7, lr}; + +# define DOCARGS_1 stmfd sp!, {r0, r1, r7, lr}; .save {r7, lr}; .pad #8 +# define UNDOCARGS_1 ldr r0, [sp], #8; RESTART_UNWIND +# define RESTORE_LR_1 RESTORE_LR_0 + +# define DOCARGS_2 stmfd sp!, {r0, r1, r7, lr}; .save {r7, lr}; .pad #8 +# define UNDOCARGS_2 ldmfd sp!, {r0, r1}; RESTART_UNWIND +# define RESTORE_LR_2 RESTORE_LR_0 + +# define DOCARGS_3 stmfd sp!, {r0, r1, r2, r3, r7, lr}; .save {r7, lr}; .pad #16 +# define UNDOCARGS_3 ldmfd sp!, {r0, r1, r2, r3}; RESTART_UNWIND +# define RESTORE_LR_3 RESTORE_LR_0 + +# define DOCARGS_4 stmfd sp!, {r0, r1, r2, r3, r7, lr}; .save {r7, lr}; .pad #16 +# define UNDOCARGS_4 ldmfd sp!, {r0, r1, r2, r3}; RESTART_UNWIND +# define RESTORE_LR_4 RESTORE_LR_0 + +# define DOCARGS_5 .save {r4}; stmfd sp!, {r0, r1, r2, r3, r4, r7, lr}; .save {r7, lr}; .pad #20 +# define UNDOCARGS_5 ldmfd sp!, {r0, r1, r2, r3}; .fnend; .fnstart; .save {r4}; .save {r7, lr}; .pad #4 +# define RESTORE_LR_5 ldmfd sp!, {r4, r7, lr} + +# define DOCARGS_6 .save {r4, r5}; stmfd sp!, {r0, r1, r2, r3, r7, lr}; .save {r7, lr}; .pad #20 +# define UNDOCARGS_6 ldmfd sp!, {r0, r1, r2, r3}; .fnend; .fnstart; .save {r4, r5}; .save {r7, 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 \ + ldr ip, 1b; \ +2: \ + ldr ip, [pc, ip]; \ + teq ip, #0; +# define PSEUDO_PROLOGUE \ + 1: .word __local_multiple_threads - 2f - 8; +# 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 PSEUDO_PROLOGUE +# define SINGLE_THREAD_P \ + stmfd sp!, {r0, lr}; \ + bl __aeabi_read_tp; \ + ldr ip, [r0, #MULTIPLE_THREADS_OFFSET]; \ + ldmfd sp!, {r0, 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 |