On Thu, Jan 15, 2015 at 09:13:30AM +0100, Jakub Jelinek wrote:
> differently. Just trying to grep for a few:
> glibc:
> ./sysdeps/alpha/bits/atomic.h:# define atomic_full_barrier() __asm ("mb" : :
> : "memory");
> ./sysdeps/alpha/bits/atomic.h:# define atomic_read_barrier() __asm ("mb" : :
> : "memory");
> ./sysdeps/alpha/bits/atomic.h:# define atomic_write_barrier() __asm ("wmb" :
> : : "memory");
> ./sysdeps/sparc/sparc32/bits/atomic.h:# define atomic_full_barrier() __asm
> ("" ::: "memory")
> ./sysdeps/powerpc/powerpc32/bits/atomic.h:# define atomic_read_barrier()
> __asm ("lwsync" ::: "memory")
> ./sysdeps/powerpc/powerpc32/bits/atomic.h:# define atomic_read_barrier()
> __asm ("sync" ::: "memory")
> ./sysdeps/powerpc/powerpc64/bits/atomic.h:#define atomic_read_barrier()
> __asm ("lwsync" ::: "memory")
> ./sysdeps/powerpc/bits/atomic.h:#define atomic_full_barrier() __asm ("sync"
> ::: "memory")
> ./sysdeps/powerpc/bits/atomic.h:#define atomic_write_barrier() __asm
> ("eieio" ::: "memory")
> ./sysdeps/generic/malloc-machine.h:# define atomic_full_barrier() __asm (""
> ::: "memory")
> ./elf/tst-tlsmod3.c: asm ("" ::: "memory");
> ./elf/tst-tlsmod4.c: asm ("" ::: "memory");
> ./elf/tst-tlsmod1.c: asm ("" ::: "memory");
> ./elf/tst-tlsmod2.c: asm ("" ::: "memory");
> ./include/atomic.h:# define atomic_full_barrier() __asm ("" ::: "memory")
> linux kernel:
> ./arch/arm/mach-omap2/pm24xx.c: asm("mcr p15, 0, %0, c7, c0, 4" : : "r"
> (zero) : "memory", "cc");
> ./arch/arm/include/asm/irqflags.h:#define local_fiq_enable() __asm__("cpsie
> f @ __stf" : : : "memory", "cc")
> ./arch/arm/include/asm/irqflags.h:#define local_fiq_disable() __asm__("cpsid
> f @ __clf" : : : "memory", "cc")
> ./arch/x86/include/asm/uaccess_64.h: asm("":::"memory");
> ./arch/x86/include/asm/uaccess_64.h: asm("":::"memory");
> ./arch/x86/include/asm/segment.h: asm("mov %%" #seg ",%0":"=r" (value) :
> : "memory")
> ./arch/x86/include/asm/stackprotector.h: asm("mov %0, %%gs" : : "r"
> (__KERNEL_STACK_CANARY) : "memory");
> ./arch/arm64/include/asm/irqflags.h:#define local_fiq_enable()
> asm("msr daifclr, #1" : : : "memory")
> ./arch/arm64/include/asm/irqflags.h:#define local_fiq_disable()
> asm("msr daifset, #1" : : : "memory")
> ./arch/arm64/include/asm/irqflags.h:#define local_async_enable()
> asm("msr daifclr, #4" : : : "memory")
> ./arch/arm64/include/asm/irqflags.h:#define local_async_disable()
> asm("msr daifset, #4" : : : "memory")
> ./arch/tile/lib/memcpy_64.c: __asm__ ("" : : :
> "memory");
> ./arch/tile/lib/memcpy_64.c: __asm__ ("" : : :
> "memory");
> ./arch/tile/include/hv/netio_intf.h: __asm__("" : : : "memory");
> ./drivers/net/ethernet/sgi/ioc3-eth.c: __asm__("sync" ::: "memory")
> ./lib/sha1.c: #define setW(x, val) do { W(x) = (val);
> __asm__("":::"memory"); } while (0)
Oops, bad grep, only the
./arch/x86/include/asm/segment.h: asm("mov %%" #seg ",%0":"=r" (value) : :
"memory")
is what we are talking about actually, asm without outputs is implicitly
volatile.
Jakub
