Commit-ID: cfcbadb49dabb05efa23e1a0f95f3391c0a815bc Gitweb: http://git.kernel.org/tip/cfcbadb49dabb05efa23e1a0f95f3391c0a815bc Author: Andy Lutomirski <[email protected]> AuthorDate: Thu, 28 Jan 2016 15:11:24 -0800 Committer: Ingo Molnar <[email protected]> CommitDate: Fri, 29 Jan 2016 09:46:38 +0100
x86/syscalls: Add syscall entry qualifiers This will let us specify something like 'sys_xyz/foo' instead of 'sys_xyz' in the syscall table, where the 'foo' qualifier conveys some extra information to the C code. The intent is to allow things like sys_execve/ptregs to indicate that sys_execve() touches pt_regs. Signed-off-by: Andy Lutomirski <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/2de06e33dce62556b3ec662006fcb295504e296e.1454022279.git.l...@kernel.org Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/entry/syscall_32.c | 4 ++-- arch/x86/entry/syscall_64.c | 4 ++-- arch/x86/entry/syscalls/syscalltbl.sh | 19 ++++++++++++++++--- arch/x86/kernel/asm-offsets_32.c | 2 +- arch/x86/kernel/asm-offsets_64.c | 4 ++-- arch/x86/um/sys_call_table_32.c | 4 ++-- arch/x86/um/sys_call_table_64.c | 4 ++-- arch/x86/um/user-offsets.c | 4 ++-- 8 files changed, 29 insertions(+), 16 deletions(-) diff --git a/arch/x86/entry/syscall_32.c b/arch/x86/entry/syscall_32.c index 3e28297..8f895ee 100644 --- a/arch/x86/entry/syscall_32.c +++ b/arch/x86/entry/syscall_32.c @@ -6,11 +6,11 @@ #include <asm/asm-offsets.h> #include <asm/syscall.h> -#define __SYSCALL_I386(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ; +#define __SYSCALL_I386(nr, sym, qual) 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) [nr] = sym, +#define __SYSCALL_I386(nr, sym, qual) [nr] = sym, extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long); diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c index 3781989..a1d4087 100644 --- a/arch/x86/entry/syscall_64.c +++ b/arch/x86/entry/syscall_64.c @@ -6,11 +6,11 @@ #include <asm/asm-offsets.h> #include <asm/syscall.h> -#define __SYSCALL_64(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ; +#define __SYSCALL_64(nr, sym, qual) 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) [nr] = sym, +#define __SYSCALL_64(nr, sym, qual) [nr] = sym, extern long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long); diff --git a/arch/x86/entry/syscalls/syscalltbl.sh b/arch/x86/entry/syscalls/syscalltbl.sh index b81479c..cd3d301 100644 --- a/arch/x86/entry/syscalls/syscalltbl.sh +++ b/arch/x86/entry/syscalls/syscalltbl.sh @@ -3,6 +3,19 @@ in="$1" out="$2" +syscall_macro() { + abi="$1" + nr="$2" + entry="$3" + + # Entry can be either just a function name or "function/qualifier" + real_entry="${entry%%/*}" + qualifier="${entry:${#real_entry}}" # Strip the function name + qualifier="${qualifier:1}" # Strip the slash, if any + + echo "__SYSCALL_${abi}($nr, $real_entry, $qualifier)" +} + emit() { abi="$1" nr="$2" @@ -16,15 +29,15 @@ emit() { if [ -z "$compat" ]; then if [ -n "$entry" ]; then - echo "__SYSCALL_${abi}($nr, $entry)" + syscall_macro "$abi" "$nr" "$entry" fi else echo "#ifdef CONFIG_X86_32" if [ -n "$entry" ]; then - echo "__SYSCALL_${abi}($nr, $entry)" + syscall_macro "$abi" "$nr" "$entry" fi echo "#else" - echo "__SYSCALL_${abi}($nr, $compat)" + syscall_macro "$abi" "$nr" "$compat" echo "#endif" fi } diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c index abec4c9..fdeb0ce 100644 --- a/arch/x86/kernel/asm-offsets_32.c +++ b/arch/x86/kernel/asm-offsets_32.c @@ -7,7 +7,7 @@ #include <linux/lguest.h> #include "../../../drivers/lguest/lg.h" -#define __SYSCALL_I386(nr, sym) [nr] = 1, +#define __SYSCALL_I386(nr, sym, qual) [nr] = 1, static char syscalls[] = { #include <asm/syscalls_32.h> }; diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c index 9677bf9..d875f97 100644 --- a/arch/x86/kernel/asm-offsets_64.c +++ b/arch/x86/kernel/asm-offsets_64.c @@ -4,11 +4,11 @@ #include <asm/ia32.h> -#define __SYSCALL_64(nr, sym) [nr] = 1, +#define __SYSCALL_64(nr, sym, qual) [nr] = 1, static char syscalls_64[] = { #include <asm/syscalls_64.h> }; -#define __SYSCALL_I386(nr, sym) [nr] = 1, +#define __SYSCALL_I386(nr, sym, qual) [nr] = 1, static char syscalls_ia32[] = { #include <asm/syscalls_32.h> }; diff --git a/arch/x86/um/sys_call_table_32.c b/arch/x86/um/sys_call_table_32.c index d4669a6..bfce503 100644 --- a/arch/x86/um/sys_call_table_32.c +++ b/arch/x86/um/sys_call_table_32.c @@ -25,11 +25,11 @@ #define old_mmap sys_old_mmap -#define __SYSCALL_I386(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ; +#define __SYSCALL_I386(nr, sym, qual) 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) [ nr ] = sym, +#define __SYSCALL_I386(nr, sym, qual) [ nr ] = sym, extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long); diff --git a/arch/x86/um/sys_call_table_64.c b/arch/x86/um/sys_call_table_64.c index 6ee5268..f306413 100644 --- a/arch/x86/um/sys_call_table_64.c +++ b/arch/x86/um/sys_call_table_64.c @@ -35,11 +35,11 @@ #define stub_execveat sys_execveat #define stub_rt_sigreturn sys_rt_sigreturn -#define __SYSCALL_64(nr, sym) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ; +#define __SYSCALL_64(nr, sym, qual) 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) [ nr ] = sym, +#define __SYSCALL_64(nr, sym, qual) [ nr ] = sym, extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long); diff --git a/arch/x86/um/user-offsets.c b/arch/x86/um/user-offsets.c index 6c9a9c1..470564b 100644 --- a/arch/x86/um/user-offsets.c +++ b/arch/x86/um/user-offsets.c @@ -9,12 +9,12 @@ #include <asm/types.h> #ifdef __i386__ -#define __SYSCALL_I386(nr, sym) [nr] = 1, +#define __SYSCALL_I386(nr, sym, qual) [nr] = 1, static char syscalls[] = { #include <asm/syscalls_32.h> }; #else -#define __SYSCALL_64(nr, sym) [nr] = 1, +#define __SYSCALL_64(nr, sym, qual) [nr] = 1, static char syscalls[] = { #include <asm/syscalls_64.h> };
