diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/atomic-machine.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/atomic-machine.h | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/atomic-machine.h b/sysdeps/unix/sysv/linux/arm/atomic-machine.h deleted file mode 100644 index 5fb516284b..0000000000 --- a/sysdeps/unix/sysv/linux/arm/atomic-machine.h +++ /dev/null @@ -1,107 +0,0 @@ -/* Atomic operations. ARM/Linux version. - Copyright (C) 2002-2017 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 <stdint.h> - -/* If the compiler doesn't provide a primitive, we'll use this macro - to get assistance from the kernel. */ -#ifdef __thumb2__ -# define __arm_assisted_full_barrier() \ - __asm__ __volatile__ \ - ("movw\tip, #0x0fa0\n\t" \ - "movt\tip, #0xffff\n\t" \ - "blx\tip" \ - : : : "ip", "lr", "cc", "memory"); -#else -# define __arm_assisted_full_barrier() \ - __asm__ __volatile__ \ - ("mov\tip, #0xffff0fff\n\t" \ - "mov\tlr, pc\n\t" \ - "add\tpc, ip, #(0xffff0fa0 - 0xffff0fff)" \ - : : : "ip", "lr", "cc", "memory"); -#endif - -/* Atomic compare and exchange. This sequence relies on the kernel to - provide a compare and exchange operation which is atomic on the - current architecture, either via cleverness on pre-ARMv6 or via - ldrex / strex on ARMv6. - - It doesn't matter what register is used for a_oldval2, but we must - specify one to work around GCC PR rtl-optimization/21223. Otherwise - it may cause a_oldval or a_tmp to be moved to a different register. - - We use the union trick rather than simply using __typeof (...) in the - declarations of A_OLDVAL et al because when NEWVAL or OLDVAL is of the - form *PTR and PTR has a 'volatile ... *' type, then __typeof (*PTR) has - a 'volatile ...' type and this triggers -Wvolatile-register-var to - complain about 'register volatile ... asm ("reg")'. */ -#ifdef __thumb2__ -/* Thumb-2 has ldrex/strex. However it does not have barrier instructions, - so we still need to use the kernel helper. */ -# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \ - ({ union { __typeof (oldval) a; uint32_t v; } oldval_arg = { .a = (oldval) };\ - union { __typeof (newval) a; uint32_t v; } newval_arg = { .a = (newval) };\ - register uint32_t a_oldval asm ("r0"); \ - register uint32_t a_newval asm ("r1") = newval_arg.v; \ - register __typeof (mem) a_ptr asm ("r2") = (mem); \ - register uint32_t a_tmp asm ("r3"); \ - register uint32_t a_oldval2 asm ("r4") = oldval_arg.v; \ - __asm__ __volatile__ \ - ("0:\tldr\t%[tmp],[%[ptr]]\n\t" \ - "cmp\t%[tmp], %[old2]\n\t" \ - "bne\t1f\n\t" \ - "mov\t%[old], %[old2]\n\t" \ - "movw\t%[tmp], #0x0fc0\n\t" \ - "movt\t%[tmp], #0xffff\n\t" \ - "blx\t%[tmp]\n\t" \ - "bcc\t0b\n\t" \ - "mov\t%[tmp], %[old2]\n\t" \ - "1:" \ - : [old] "=&r" (a_oldval), [tmp] "=&r" (a_tmp) \ - : [new] "r" (a_newval), [ptr] "r" (a_ptr), \ - [old2] "r" (a_oldval2) \ - : "ip", "lr", "cc", "memory"); \ - (__typeof (oldval)) a_tmp; }) -#else -# define __arm_assisted_compare_and_exchange_val_32_acq(mem, newval, oldval) \ - ({ union { __typeof (oldval) a; uint32_t v; } oldval_arg = { .a = (oldval) };\ - union { __typeof (newval) a; uint32_t v; } newval_arg = { .a = (newval) };\ - register uint32_t a_oldval asm ("r0"); \ - register uint32_t a_newval asm ("r1") = newval_arg.v; \ - register __typeof (mem) a_ptr asm ("r2") = (mem); \ - register uint32_t a_tmp asm ("r3"); \ - register uint32_t a_oldval2 asm ("r4") = oldval_arg.v; \ - __asm__ __volatile__ \ - ("0:\tldr\t%[tmp],[%[ptr]]\n\t" \ - "cmp\t%[tmp], %[old2]\n\t" \ - "bne\t1f\n\t" \ - "mov\t%[old], %[old2]\n\t" \ - "mov\t%[tmp], #0xffff0fff\n\t" \ - "mov\tlr, pc\n\t" \ - "add\tpc, %[tmp], #(0xffff0fc0 - 0xffff0fff)\n\t" \ - "bcc\t0b\n\t" \ - "mov\t%[tmp], %[old2]\n\t" \ - "1:" \ - : [old] "=&r" (a_oldval), [tmp] "=&r" (a_tmp) \ - : [new] "r" (a_newval), [ptr] "r" (a_ptr), \ - [old2] "r" (a_oldval2) \ - : "ip", "lr", "cc", "memory"); \ - (__typeof (oldval)) a_tmp; }) -#endif - -#include <sysdeps/arm/atomic-machine.h> |