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x86/syscalls: Move compat syscall entry handling into syscalltbl.sh

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Rather than duplicating the compat entry handling in all
consumers of syscalls_BITS.h, handle it directly in
syscalltbl.sh.  Now we generate entries in syscalls_32.h like:

__SYSCALL_I386(5, sys_open)
__SYSCALL_I386(5, compat_sys_open)

and all of its consumers implicitly get the right entry point.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/b7c2b501dc0e6e43050e916b95807c3e2e16e9bb.1454022279.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2016-01-28 15:11:23 -08:00 committed by Ingo Molnar
parent 32324ce15e
commit 3e65654e3d
8 changed files with 31 additions and 23 deletions
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10
arch/x86/entry/syscall_32.c
View File

@ -6,17 +6,11 @@
#include <asm/asm-offsets.h>
#include <asm/syscall.h>
#ifdef CONFIG_IA32_EMULATION
#define SYM(sym, compat) compat
#else
#define SYM(sym, compat) sym
#endif
#define __SYSCALL_I386(nr, sym, compat) extern asmlinkage long SYM(sym, compat)(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#define __SYSCALL_I386(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#include <asm/syscalls_32.h>
#undef __SYSCALL_I386
#define __SYSCALL_I386(nr, sym, compat) [nr] = SYM(sym, compat),
#define __SYSCALL_I386(nr, sym) [nr] = sym,
extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);

4
arch/x86/entry/syscall_64.c
View File

@ -6,11 +6,11 @@
#include <asm/asm-offsets.h>
#include <asm/syscall.h>
#define __SYSCALL_64(nr, sym, compat) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#define __SYSCALL_64(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#include <asm/syscalls_64.h>
#undef __SYSCALL_64
#define __SYSCALL_64(nr, sym, compat) [nr] = sym,
#define __SYSCALL_64(nr, sym) [nr] = sym,
extern long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);

22
arch/x86/entry/syscalls/syscalltbl.sh
View File

@ -8,10 +8,24 @@ emit() {
nr="$2"
entry="$3"
compat="$4"
if [ -n "$compat" ]; then
echo "__SYSCALL_${abi}($nr, $entry, $compat)"
elif [ -n "$entry" ]; then
echo "__SYSCALL_${abi}($nr, $entry, $entry)"
if [ "$abi" == "64" -a -n "$compat" ]; then
echo "a compat entry for a 64-bit syscall makes no sense" >&2
exit 1
fi
if [ -z "$compat" ]; then
if [ -n "$entry" ]; then
echo "__SYSCALL_${abi}($nr, $entry)"
fi
else
echo "#ifdef CONFIG_X86_32"
if [ -n "$entry" ]; then
echo "__SYSCALL_${abi}($nr, $entry)"
fi
echo "#else"
echo "__SYSCALL_${abi}($nr, $compat)"
echo "#endif"
fi
}

2
arch/x86/kernel/asm-offsets_32.c
View File

@ -7,7 +7,7 @@
#include <linux/lguest.h>
#include "../../../drivers/lguest/lg.h"
#define __SYSCALL_I386(nr, sym, compat) [nr] = 1,
#define __SYSCALL_I386(nr, sym) [nr] = 1,
static char syscalls[] = {
#include <asm/syscalls_32.h>
};

4
arch/x86/kernel/asm-offsets_64.c
View File

@ -4,11 +4,11 @@
#include <asm/ia32.h>
#define __SYSCALL_64(nr, sym, compat) [nr] = 1,
#define __SYSCALL_64(nr, sym) [nr] = 1,
static char syscalls_64[] = {
#include <asm/syscalls_64.h>
};
#define __SYSCALL_I386(nr, sym, compat) [nr] = 1,
#define __SYSCALL_I386(nr, sym) [nr] = 1,
static char syscalls_ia32[] = {
#include <asm/syscalls_32.h>
};

4
arch/x86/um/sys_call_table_32.c
View File

@ -25,11 +25,11 @@
#define old_mmap sys_old_mmap
#define __SYSCALL_I386(nr, sym, compat) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#define __SYSCALL_I386(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#include <asm/syscalls_32.h>
#undef __SYSCALL_I386
#define __SYSCALL_I386(nr, sym, compat) [ nr ] = sym,
#define __SYSCALL_I386(nr, sym) [ nr ] = sym,
extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);

4
arch/x86/um/sys_call_table_64.c
View File

@ -35,11 +35,11 @@
#define stub_execveat sys_execveat
#define stub_rt_sigreturn sys_rt_sigreturn
#define __SYSCALL_64(nr, sym, compat) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#define __SYSCALL_64(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
#include <asm/syscalls_64.h>
#undef __SYSCALL_64
#define __SYSCALL_64(nr, sym, compat) [ nr ] = sym,
#define __SYSCALL_64(nr, sym) [ nr ] = sym,
extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);

4
arch/x86/um/user-offsets.c
View File

@ -9,12 +9,12 @@
#include <asm/types.h>
#ifdef __i386__
#define __SYSCALL_I386(nr, sym, compat) [nr] = 1,
#define __SYSCALL_I386(nr, sym) [nr] = 1,
static char syscalls[] = {
#include <asm/syscalls_32.h>
};
#else
#define __SYSCALL_64(nr, sym, compat) [nr] = 1,
#define __SYSCALL_64(nr, sym) [nr] = 1,
static char syscalls[] = {
#include <asm/syscalls_64.h>
};