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Commit af52201d authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Ingo Molnar
Browse files

x86/entry: Do not special-case clone(2) in compat entry 



With the CPU renaming registers on its own, and all the overhead of the
syscall entry/exit, it is doubtful whether the compiled output of

	mov	%r8, %rax
	mov	%rcx, %r8
	mov	%rax, %rcx
	jmpq	sys_clone

is measurably slower than the hand-crafted version of

	xchg	%r8, %rcx

So get rid of this special case.

Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: luto@amacapital.net
Cc: viro@zeniv.linux.org.uk
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 4ddb45db

arch/x86/entry/entry_64_compat.S

+0 −12
Original line number Diff line number Diff line
@@ -406,15 +406,3 @@ ENTRY(entry_INT80_compat) 
	TRACE_IRQS_ON

	jmp	swapgs_restore_regs_and_return_to_usermode

END(entry_INT80_compat)
 


ENTRY(stub32_clone)

	/*

	 * The 32-bit clone ABI is: clone(..., int tls_val, int *child_tidptr).

	 * The 64-bit clone ABI is: clone(..., int *child_tidptr, int tls_val).

	 *

	 * The native 64-bit kernel's sys_clone() implements the latter,

	 * so we need to swap arguments here before calling it:

	 */

	xchg	%r8, %rcx

	jmp	sys_clone

ENDPROC(stub32_clone)

arch/x86/entry/syscalls/syscall_32.tbl

+1 −1
Original line number Diff line number Diff line
@@ -126,7 +126,7 @@ 
117	i386	ipc			sys_ipc				compat_sys_ipc

118	i386	fsync			sys_fsync

119	i386	sigreturn		sys_sigreturn			sys32_sigreturn

120	i386	clone			sys_clone			stub32_clone

120	i386	clone			sys_clone			compat_sys_x86_clone

121	i386	setdomainname		sys_setdomainname

122	i386	uname			sys_newuname

123	i386	modify_ldt		sys_modify_ldt

arch/x86/ia32/sys_ia32.c

+11 −0
Original line number Diff line number Diff line
@@ -233,3 +233,14 @@ COMPAT_SYSCALL_DEFINE6(x86_fallocate, int, fd, int, mode, 
	return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,

			     ((u64)len_hi << 32) | len_lo);

}



/*

 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS

 */

COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,

		       unsigned long, newsp, int __user *, parent_tidptr,

		       unsigned long, tls_val, int __user *, child_tidptr)

{

	return sys_clone(clone_flags, newsp, parent_tidptr, child_tidptr,

			tls_val);

}

arch/x86/include/asm/sys_ia32.h

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ asmlinkage long compat_sys_x86_fadvise64(int, unsigned int, unsigned int, 
					 size_t, int);

asmlinkage long compat_sys_x86_fallocate(int, int, unsigned int, unsigned int,

					 unsigned int, unsigned int);

asmlinkage long compat_sys_x86_clone(unsigned long, unsigned long, int __user *,

				     unsigned long, int __user *);



/* ia32/ia32_signal.c */

asmlinkage long sys32_sigreturn(void);