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243 lines
6.7 KiB
C
243 lines
6.7 KiB
C
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <tls.h>
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#ifndef __ASSEMBLER__
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# include <nptl/pthreadP.h>
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#endif
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#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
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/* NOTE: We do mark syscalls with unwind annotations, for the benefit of
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cancellation; but they're really only accurate at the point of the
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syscall. The ARM unwind directives are not rich enough without adding
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a custom personality function. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (__##syscall_name##_nocancel); \
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CFI_SECTIONS; \
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DO_CALL (syscall_name, args); \
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cmn r0, $4096; \
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PSEUDO_RET; \
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END (__##syscall_name##_nocancel); \
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ENTRY (name); \
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SINGLE_THREAD_P; \
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DOARGS_##args; \
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bne .Lpseudo_cancel; \
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cfi_remember_state; \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; \
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UNDOARGS_##args; \
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cmn r0, $4096; \
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PSEUDO_RET; \
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cfi_restore_state; \
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.Lpseudo_cancel: \
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.fnstart; /* matched by the .fnend in UNDOARGS below. */ \
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DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
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CENABLE; \
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mov ip, r0; /* put mask in safe place. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; /* do the call. */ \
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mov r7, r0; /* save syscall return value. */ \
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mov r0, ip; /* get mask back. */ \
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CDISABLE; \
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mov r0, r7; /* retrieve return value. */ \
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RESTORE_LR_##args; \
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UNDOARGS_##args; \
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cmn r0, $4096
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/* DOARGS pushes eight bytes on the stack for five arguments, twelve bytes for
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six arguments, and four bytes for fewer. In order to preserve doubleword
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alignment, sometimes we must save an extra register. */
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# define RESTART_UNWIND \
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.fnend; \
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.fnstart; \
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.save {r7}; \
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.save {lr}
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# define DOCARGS_0 \
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.save {r7}; \
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push {lr}; \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (lr, 0); \
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.save {lr}
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# define UNDOCARGS_0
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# define RESTORE_LR_0 \
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pop {lr}; \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (lr)
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# define DOCARGS_1 \
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.save {r7}; \
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push {r0, r1, lr}; \
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cfi_adjust_cfa_offset (12); \
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cfi_rel_offset (lr, 8); \
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.save {lr}; \
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.pad #8
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# define UNDOCARGS_1 \
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ldr r0, [sp], #8; \
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cfi_adjust_cfa_offset (-8); \
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RESTART_UNWIND
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# define RESTORE_LR_1 \
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RESTORE_LR_0
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# define DOCARGS_2 \
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.save {r7}; \
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push {r0, r1, lr}; \
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cfi_adjust_cfa_offset (12); \
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cfi_rel_offset (lr, 8); \
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.save {lr}; \
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.pad #8
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# define UNDOCARGS_2 \
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pop {r0, r1}; \
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cfi_adjust_cfa_offset (-8); \
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RESTART_UNWIND
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# define RESTORE_LR_2 \
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RESTORE_LR_0
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# define DOCARGS_3 \
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.save {r7}; \
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push {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_3 \
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pop {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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RESTART_UNWIND
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# define RESTORE_LR_3 \
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RESTORE_LR_0
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# define DOCARGS_4 \
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.save {r7}; \
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push {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_4 \
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pop {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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RESTART_UNWIND
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# define RESTORE_LR_4 \
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RESTORE_LR_0
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/* r4 is only stmfd'ed for correct stack alignment. */
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# define DOCARGS_5 \
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.save {r4, r7}; \
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push {r0, r1, r2, r3, r4, lr}; \
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cfi_adjust_cfa_offset (24); \
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cfi_rel_offset (lr, 20); \
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.save {lr}; \
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.pad #20
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# define UNDOCARGS_5 \
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pop {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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.fnend; \
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.fnstart; \
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.save {r4, r7}; \
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.save {lr}; \
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.pad #4
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# define RESTORE_LR_5 \
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pop {r4, lr}; \
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cfi_adjust_cfa_offset (-8); \
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/* r4 will be marked as restored later. */ \
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cfi_restore (lr)
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# define DOCARGS_6 \
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.save {r4, r5, r7}; \
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push {r0, r1, r2, r3, lr}; \
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cfi_adjust_cfa_offset (20); \
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cfi_rel_offset (lr, 16); \
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.save {lr}; \
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.pad #16
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# define UNDOCARGS_6 \
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pop {r0, r1, r2, r3}; \
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cfi_adjust_cfa_offset (-16); \
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.fnend; \
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.fnstart; \
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.save {r4, r5, r7}; \
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.save {lr};
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# define RESTORE_LR_6 \
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RESTORE_LR_0
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# ifdef IS_IN_libpthread
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# define CENABLE bl PLTJMP(__pthread_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel)
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# define __local_multiple_threads __pthread_multiple_threads
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# elif !defined NOT_IN_libc
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# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
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# define __local_multiple_threads __libc_multiple_threads
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# elif defined IS_IN_librt
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# define CENABLE bl PLTJMP(__librt_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__librt_disable_asynccancel)
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# else
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# error Unsupported library
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# endif
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# if defined IS_IN_libpthread || !defined NOT_IN_libc
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# ifndef __ASSEMBLER__
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extern int __local_multiple_threads attribute_hidden;
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# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
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# else
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# define SINGLE_THREAD_P \
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LDST_PCREL(ldr, ip, ip, __local_multiple_threads); \
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teq ip, #0
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# endif
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# else
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/* There is no __local_multiple_threads for librt, so use the TCB. */
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# ifndef __ASSEMBLER__
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# define SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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# else
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# define SINGLE_THREAD_P \
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push {r0, lr}; \
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cfi_adjust_cfa_offset (8); \
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cfi_rel_offset (lr, 4); \
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GET_TLS (lr); \
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NEGOFF_ADJ_BASE (r0, MULTIPLE_THREADS_OFFSET); \
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ldr ip, NEGOFF_OFF1 (r0, MULTIPLE_THREADS_OFFSET); \
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pop {r0, lr}; \
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cfi_adjust_cfa_offset (-8); \
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cfi_restore (lr); \
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teq ip, #0
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# define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P
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# endif
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# endif
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#elif !defined __ASSEMBLER__
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/* For rtld, et cetera. */
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# define SINGLE_THREAD_P 1
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# define NO_CANCELLATION 1
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#endif
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#ifndef __ASSEMBLER__
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# define RTLD_SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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#endif
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