Commit 83aec96c authored by Benjamin Berg's avatar Benjamin Berg Committed by Richard Weinberger
Browse files

um: Mark 32bit syscall helpers as clobbering memory 



The 64bit helper are marked to clobber the memory, but the 32bit ones
are not. Add the appropriate clobber to the 32bit helper routines so
that the compiler cannot do invalid optimizations.

Signed-off-by: default avatarBenjamin Berg <benjamin@sipsolutions.net>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 1e41c415

arch/x86/um/shared/sysdep/stub_32.h

+12 −6
Original line number Diff line number Diff line
@@ -16,7 +16,8 @@ static __always_inline long stub_syscall0(long syscall) 
{

	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)

			: "memory");



	return ret;

}
@@ -25,7 +26,8 @@ static __always_inline long stub_syscall1(long syscall, long arg1) 
{

	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)

			: "memory");



	return ret;

}
@@ -35,7 +37,8 @@ static __always_inline long stub_syscall2(long syscall, long arg1, long arg2) 
	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),

			"c" (arg2));

			"c" (arg2)

			: "memory");



	return ret;

}
@@ -46,7 +49,8 @@ static __always_inline long stub_syscall3(long syscall, long arg1, long arg2, 
	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),

			"c" (arg2), "d" (arg3));

			"c" (arg2), "d" (arg3)

			: "memory");



	return ret;

}
@@ -57,7 +61,8 @@ static __always_inline long stub_syscall4(long syscall, long arg1, long arg2, 
	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),

			"c" (arg2), "d" (arg3), "S" (arg4));

			"c" (arg2), "d" (arg3), "S" (arg4)

			: "memory");



	return ret;

}
@@ -68,7 +73,8 @@ static __always_inline long stub_syscall5(long syscall, long arg1, long arg2, 
	long ret;



	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),

			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));

			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)

			: "memory");



	return ret;

}