diff options
| author | Masahiro Yamada <masahiroy@kernel.org> | 2021-05-17 16:38:09 +0900 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-05-20 15:03:58 +0200 |
| commit | 2e958a8a510d956ec8528f0bd20e309b5bb5156c (patch) | |
| tree | 57661eec425dbdb46c183f12a7f1ae21fa95ed09 /arch/x86/entry/syscall_x32.c | |
| parent | 41f45fb045bcc20e71eb705b361356e715682162 (diff) | |
x86/entry/x32: Rename __x32_compat_sys_* to __x64_compat_sys_*
The SYSCALL macros are mapped to symbols as follows:
__SYSCALL_COMMON(nr, sym) --> __x64_<sym>
__SYSCALL_X32(nr, sym) --> __x32_<sym>
Originally, the syscalls in the x32 special range (512-547) were all
compat.
This assumption is now broken after the following commits:
55db9c0e8534 ("net: remove compat_sys_{get,set}sockopt")
5f764d624a89 ("fs: remove the compat readv/writev syscalls")
598b3cec831f ("fs: remove compat_sys_vmsplice")
c3973b401ef2 ("mm: remove compat_process_vm_{readv,writev}")
Those commits redefined __x32_sys_* to __x64_sys_* because there is no stub
like __x32_sys_*.
Defining them as follows is more sensible and cleaner.
__SYSCALL_COMMON(nr, sym) --> __x64_<sym>
__SYSCALL_X32(nr, sym) --> __x64_<sym>
This works because both x86_64 and x32 use the same ABI (RDI, RSI, RDX,
R10, R8, R9)
The ugly #define __x32_sys_* will go away.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210517073815.97426-2-masahiroy@kernel.org
Diffstat (limited to 'arch/x86/entry/syscall_x32.c')
| -rw-r--r-- | arch/x86/entry/syscall_x32.c | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c index f2fe0a33bcfd..3fea8fb9cd6a 100644 --- a/arch/x86/entry/syscall_x32.c +++ b/arch/x86/entry/syscall_x32.c @@ -8,27 +8,15 @@ #include <asm/unistd.h> #include <asm/syscall.h> -/* - * Reuse the 64-bit entry points for the x32 versions that occupy different - * slots in the syscall table. - */ -#define __x32_sys_readv __x64_sys_readv -#define __x32_sys_writev __x64_sys_writev -#define __x32_sys_getsockopt __x64_sys_getsockopt -#define __x32_sys_setsockopt __x64_sys_setsockopt -#define __x32_sys_vmsplice __x64_sys_vmsplice -#define __x32_sys_process_vm_readv __x64_sys_process_vm_readv -#define __x32_sys_process_vm_writev __x64_sys_process_vm_writev - #define __SYSCALL_64(nr, sym) -#define __SYSCALL_X32(nr, sym) extern long __x32_##sym(const struct pt_regs *); +#define __SYSCALL_X32(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_COMMON(nr, sym) extern long __x64_##sym(const struct pt_regs *); #include <asm/syscalls_64.h> #undef __SYSCALL_X32 #undef __SYSCALL_COMMON -#define __SYSCALL_X32(nr, sym) [nr] = __x32_##sym, +#define __SYSCALL_X32(nr, sym) [nr] = __x64_##sym, #define __SYSCALL_COMMON(nr, sym) [nr] = __x64_##sym, asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_x32_syscall_max+1] = { |