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authorBrian Gerst <brgerst@gmail.com>2020-03-13 15:51:28 -0400
committerThomas Gleixner <tglx@linutronix.de>2020-03-21 16:03:19 +0100
commitd2b5de495ee9838b3752806c135afd43b76b1e8f (patch)
tree165c441a799d7d828550c6282c7bf868fa4ea4b9 /arch/x86/include
parent4399e0cf494f739af7e0648f52fe43311ecd1bea (diff)
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
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/syscall_wrapper.h73
1 files changed, 32 insertions, 41 deletions
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index a1c090bde063..45ad60571166 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -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) \

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