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Subject[PATCH v3 1/8] x86, syscalls: Refactor SYSCALL_DEFINEx macros
Date
Pull the common code out from the SYSCALL_DEFINEx macros into a new
__SYS_STUBx 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>
---
arch/x86/include/asm/syscall_wrapper.h | 74 ++++++++++++++------------
1 file changed, 39 insertions(+), 35 deletions(-)

diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index e2389ce9bf58..7a4c2aff52c6 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -21,6 +21,22 @@ struct pt_regs;
,,(unsigned int)regs->dx,,(unsigned int)regs->si \
,,(unsigned int)regs->di,,(unsigned int)regs->bp)

+#define __SYS_STUBx(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) \
+ { \
+ return __se_##name(__VA_ARGS__); \
+ }
+
+#ifdef CONFIG_X86_64
+#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_STUBx(x, name, ...)
+#endif /* CONFIG_X86_64 */
+
#ifdef CONFIG_IA32_EMULATION
/*
* For IA32 emulation, we need to handle "compat" syscalls *and* create
@@ -39,20 +55,12 @@ struct pt_regs;
}

#define __IA32_COMPAT_SYS_STUBx(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(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));\
- }
+ __SYS_STUBx(ia32, compat_sys##name, \
+ SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__))

#define __IA32_SYS_STUBx(x, name, ...) \
- asmlinkage long __ia32_sys##name(const struct pt_regs *regs); \
- ALLOW_ERROR_INJECTION(__ia32_sys##name, ERRNO); \
- asmlinkage long __ia32_sys##name(const struct pt_regs *regs) \
- { \
- return __se_sys##name(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));\
- }
+ __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
@@ -82,7 +90,7 @@ struct pt_regs;

#else /* CONFIG_IA32_EMULATION */
#define __IA32_COMPAT_SYS_STUBx(x, name, ...)
-#define __IA32_SYS_STUBx(x, fullname, name, ...)
+#define __IA32_SYS_STUBx(x, name, ...)
#endif /* CONFIG_IA32_EMULATION */


@@ -101,12 +109,8 @@ struct pt_regs;
}

#define __X32_COMPAT_SYS_STUBx(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(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\
- }
+ __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)
@@ -131,16 +135,21 @@ struct pt_regs;
} \
static inline long __do_compat_sys_##name(void)

-#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
- static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
- static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
- __IA32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \
- __X32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \
- static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
- { \
- return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
- } \
- static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
+#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
+ static long \
+ __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)); \
+ static inline long \
+ __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__)); \
+ __IA32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \
+ __X32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \
+ static long \
+ __se_compat_sys##name(__MAP(x, __SC_LONG, __VA_ARGS__)) \
+ { \
+ return __do_compat_sys##name( \
+ __MAP(x, __SC_DELOUSE, __VA_ARGS__)); \
+ } \
+ static inline long \
+ __do_compat_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))

/*
* As some compat syscalls may not be implemented, we need to expand
@@ -192,14 +201,9 @@ struct pt_regs;
* to the i386 calling convention (bx, cx, dx, si, di, bp).
*/
#define __SYSCALL_DEFINEx(x, name, ...) \
- asmlinkage long __x64_sys##name(const struct pt_regs *regs); \
- ALLOW_ERROR_INJECTION(__x64_sys##name, ERRNO); \
static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
- asmlinkage long __x64_sys##name(const struct pt_regs *regs) \
- { \
- return __se_sys##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\
- } \
+ __X64_SYS_STUBx(x, name, __VA_ARGS__) \
__IA32_SYS_STUBx(x, name, __VA_ARGS__) \
static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
--
2.24.1
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