1 /**************************************************************************** 2 **************************************************************************** 3 *** 4 *** This header was automatically generated from a Linux kernel header 5 *** of the same name, to make information necessary for userspace to 6 *** call into the kernel available to libc. It contains only constants, 7 *** structures, and macros generated from the original header, and thus, 8 *** contains no copyrightable information. 9 *** 10 *** To edit the content of this header, modify the corresponding 11 *** source file (e.g. under external/kernel-headers/original/) then 12 *** run bionic/libc/kernel/tools/update_all.py 13 *** 14 *** Any manual change here will be lost the next time this script will 15 *** be run. You've been warned! 16 *** 17 **************************************************************************** 18 ****************************************************************************/ 19 #ifndef __ASM_CMPXCHG_H 20 #define __ASM_CMPXCHG_H 21 #include <linux/irqflags.h> 22 #define __HAVE_ARCH_CMPXCHG 1 23 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ 24 #define __cmpxchg_asm(ld, st, m, old, new) ({ __typeof(*(m)) __ret; if (cpu_has_llsc && R10000_LLSC_WAR) { __asm__ __volatile__( " .set push \n" " .set noat \n" " .set mips3 \n" "1: " ld " %0, %2 # __cmpxchg_asm \n" " bne %0, %z3, 2f \n" " .set mips0 \n" " move $1, %z4 \n" " .set mips3 \n" " " st " $1, %1 \n" " beqzl $1, 1b \n" "2: \n" " .set pop \n" : "=&r" (__ret), "=R" (*m) : "R" (*m), "Jr" (old), "Jr" (new) : "memory"); } else if (cpu_has_llsc) { __asm__ __volatile__( " .set push \n" " .set noat \n" " .set mips3 \n" "1: " ld " %0, %2 # __cmpxchg_asm \n" " bne %0, %z3, 2f \n" " .set mips0 \n" " move $1, %z4 \n" " .set mips3 \n" " " st " $1, %1 \n" " beqz $1, 3f \n" "2: \n" " .subsection 2 \n" "3: b 1b \n" " .previous \n" " .set pop \n" : "=&r" (__ret), "=R" (*m) : "R" (*m), "Jr" (old), "Jr" (new) : "memory"); } else { unsigned long __flags; raw_local_irq_save(__flags); __ret = *m; if (__ret == old) *m = new; raw_local_irq_restore(__flags); } __ret; }) 25 #define __cmpxchg(ptr, old, new, barrier) ({ __typeof__(ptr) __ptr = (ptr); __typeof__(*(ptr)) __old = (old); __typeof__(*(ptr)) __new = (new); __typeof__(*(ptr)) __res = 0; barrier; switch (sizeof(*(__ptr))) { case 4: __res = __cmpxchg_asm("ll", "sc", __ptr, __old, __new); break; case 8: if (sizeof(long) == 8) { __res = __cmpxchg_asm("lld", "scd", __ptr, __old, __new); break; } default: __cmpxchg_called_with_bad_pointer(); break; } barrier; __res; }) 26 #define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_llsc_mb()) 27 #define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new, ) 28 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ 29 #define cmpxchg64(ptr, o, n) ({ BUILD_BUG_ON(sizeof(*(ptr)) != 8); cmpxchg((ptr), (o), (n)); }) 30 #include <asm-generic/cmpxchg-local.h> 31 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) 32 #endif 33 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */ 34