openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/entry: Refactor SYSCALL_DEFINE0 macros 

Pull the common code out from the SYSCALL_DEFINE0 macros into a new
__SYS_STUB0 macro.  Also conditionalize the X64 version in preparation for
enabling syscall wrappers on 32-bit native kernels.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200313195144.164260-3-brgerst@gmail.com
This commit is contained in:
Brian Gerst 2020-03-13 15:51:28 -04:00 committed by Thomas Gleixner
parent 4399e0cf49
commit d2b5de495e
1 changed files with 32 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
arch/x86/include/asm/syscall_wrapper.h
View File

@ -21,6 +21,12 @@ struct pt_regs;
,,(unsigned int)regs->dx,,(unsigned int)regs->si \
,,(unsigned int)regs->di,,(unsigned int)regs->bp)
#define __SYS_STUB0(abi, name) \
asmlinkage long __##abi##_##name(const struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
asmlinkage long __##abi##_##name(const struct pt_regs *regs) \
__alias(__do_##name);
#define __SYS_STUBx(abi, name, ...) \
asmlinkage long __##abi##_##name(const struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
@ -30,10 +36,14 @@ struct pt_regs;
}
#ifdef CONFIG_X86_64
#define __X64_SYS_STUB0(name) \
__SYS_STUB0(x64, sys_##name)
#define __X64_SYS_STUBx(x, name, ...) \
__SYS_STUBx(x64, sys##name, \
SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__))
#else /* CONFIG_X86_64 */
#define __X64_SYS_STUB0(name)
#define __X64_SYS_STUBx(x, name, ...)
#endif /* CONFIG_X86_64 */
@ -46,34 +56,20 @@ struct pt_regs;
* kernel/sys_ni.c and SYS_NI in kernel/time/posix-stubs.c to cover this
* case as well.
*/
#define __IA32_COMPAT_SYS_STUB0(x, name) \
asmlinkage long __ia32_compat_sys_##name(const struct pt_regs *regs);\
ALLOW_ERROR_INJECTION(__ia32_compat_sys_##name, ERRNO); \
asmlinkage long __ia32_compat_sys_##name(const struct pt_regs *regs)\
{ \
return __se_compat_sys_##name(); \
}
#define __IA32_COMPAT_SYS_STUB0(name) \
__SYS_STUB0(ia32, compat_sys_##name)
#define __IA32_COMPAT_SYS_STUBx(x, name, ...) \
__SYS_STUBx(ia32, compat_sys##name, \
SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__))
#define __IA32_SYS_STUB0(name) \
__SYS_STUB0(ia32, sys_##name)
#define __IA32_SYS_STUBx(x, name, ...) \
__SYS_STUBx(ia32, sys##name, \
SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__))
/*
* To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
* named __ia32_sys_*()
*/
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused);\
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
SYSCALL_ALIAS(__ia32_sys_##sname, __x64_sys_##sname); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused)
#define COND_SYSCALL(name) \
asmlinkage __weak long __x64_sys_##name(const struct pt_regs *__unused) \
{ \
@ -89,7 +85,9 @@ struct pt_regs;
SYSCALL_ALIAS(__ia32_sys_##name, sys_ni_posix_timers)
#else /* CONFIG_IA32_EMULATION */
#define __IA32_COMPAT_SYS_STUB0(name)
#define __IA32_COMPAT_SYS_STUBx(x, name, ...)
#define __IA32_SYS_STUB0(name)
#define __IA32_SYS_STUBx(x, name, ...)
#endif /* CONFIG_IA32_EMULATION */
@ -100,20 +98,15 @@ struct pt_regs;
* of the x86-64-style parameter ordering of x32 syscalls. The syscalls common
* with x86_64 obviously do not need such care.
*/
#define __X32_COMPAT_SYS_STUB0(x, name, ...) \
asmlinkage long __x32_compat_sys_##name(const struct pt_regs *regs);\
ALLOW_ERROR_INJECTION(__x32_compat_sys_##name, ERRNO); \
asmlinkage long __x32_compat_sys_##name(const struct pt_regs *regs)\
{ \
return __se_compat_sys_##name();\
}
#define __X32_COMPAT_SYS_STUB0(name) \
__SYS_STUB0(x32, compat_sys_##name)
#define __X32_COMPAT_SYS_STUBx(x, name, ...) \
__SYS_STUBx(x32, compat_sys##name, \
SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__))
#else /* CONFIG_X86_X32 */
#define __X32_COMPAT_SYS_STUB0(x, name)
#define __X32_COMPAT_SYS_STUB0(name)
#define __X32_COMPAT_SYS_STUBx(x, name, ...)
#endif /* CONFIG_X86_X32 */
@ -125,15 +118,12 @@ struct pt_regs;
* of them.
*/
#define COMPAT_SYSCALL_DEFINE0(name) \
static long __se_compat_sys_##name(void); \
static inline long __do_compat_sys_##name(void); \
__IA32_COMPAT_SYS_STUB0(x, name) \
__X32_COMPAT_SYS_STUB0(x, name) \
static long __se_compat_sys_##name(void) \
{ \
return __do_compat_sys_##name(); \
} \
static inline long __do_compat_sys_##name(void)
static asmlinkage long \
__do_compat_sys_##name(const struct pt_regs *__unused); \
__IA32_COMPAT_SYS_STUB0(name) \
__X32_COMPAT_SYS_STUB0(name) \
static asmlinkage long \
__do_compat_sys_##name(const struct pt_regs *__unused)
#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
@ -216,13 +206,14 @@ struct pt_regs;
* SYSCALL_DEFINEx() -- which is essential for the COND_SYSCALL() and SYS_NI()
* macros to work correctly.
*/
#ifndef SYSCALL_DEFINE0
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused);\
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused)
#endif
static asmlinkage long \
__do_sys_##sname(const struct pt_regs *__unused); \
__X64_SYS_STUB0(sname) \
__IA32_SYS_STUB0(sname) \
static asmlinkage long \
__do_sys_##sname(const struct pt_regs *__unused)
#ifndef COND_SYSCALL
#define COND_SYSCALL(name) \