mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
/* 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)
|
|
|
|
/* 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
|
|
|
|
# if 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 IS_IN (libc)
|
|
# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
|
|
# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
|
|
# define __local_multiple_threads __libc_multiple_threads
|
|
# elif IS_IN (librt)
|
|
# define CENABLE bl PLTJMP(__librt_enable_asynccancel)
|
|
# define CDISABLE bl PLTJMP(__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 \
|
|
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
|
|
# 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
|