diff options
| author | Brian Gerst <brgerst@gmail.com> | 2020-03-13 15:51:29 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-21 16:03:19 +0100 |
| commit | 6cc8d2b286d9e7168d72e342d1b031317cd7752b (patch) | |
| tree | bff56982cb5516cd1af44dbb008bbff44bd39aa5 | |
| parent | d2b5de495ee9838b3752806c135afd43b76b1e8f (diff) | |
x86/entry: Refactor COND_SYSCALL macros
Pull the common code out from the COND_SYSCALL macros into a new
__COND_SYSCALL 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/20200313195144.164260-4-brgerst@gmail.com
| -rw-r--r-- | arch/x86/include/asm/syscall_wrapper.h | 44 |
1 files changed, 26 insertions, 18 deletions
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h index 45ad60571166..0117b25e6753 100644 --- a/arch/x86/include/asm/syscall_wrapper.h +++ b/arch/x86/include/asm/syscall_wrapper.h @@ -35,6 +35,13 @@ struct pt_regs; return __se_##name(__VA_ARGS__); \ } +#define __COND_SYSCALL(abi, name) \ + asmlinkage __weak long \ + __##abi##_##name(const struct pt_regs *__unused) \ + { \ + return sys_ni_syscall(); \ + } + #ifdef CONFIG_X86_64 #define __X64_SYS_STUB0(name) \ __SYS_STUB0(x64, sys_##name) @@ -42,9 +49,13 @@ struct pt_regs; #define __X64_SYS_STUBx(x, name, ...) \ __SYS_STUBx(x64, sys##name, \ SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__)) + +#define __X64_COND_SYSCALL(name) \ + __COND_SYSCALL(x64, sys_##name) #else /* CONFIG_X86_64 */ #define __X64_SYS_STUB0(name) #define __X64_SYS_STUBx(x, name, ...) +#define __X64_COND_SYSCALL(name) #endif /* CONFIG_X86_64 */ #ifdef CONFIG_IA32_EMULATION @@ -63,6 +74,9 @@ struct pt_regs; __SYS_STUBx(ia32, compat_sys##name, \ SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__)) +#define __IA32_COMPAT_COND_SYSCALL(name) \ + __COND_SYSCALL(ia32, compat_sys_##name) + #define __IA32_SYS_STUB0(name) \ __SYS_STUB0(ia32, sys_##name) @@ -70,15 +84,8 @@ struct pt_regs; __SYS_STUBx(ia32, sys##name, \ SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__)) -#define COND_SYSCALL(name) \ - asmlinkage __weak long __x64_sys_##name(const struct pt_regs *__unused) \ - { \ - return sys_ni_syscall(); \ - } \ - asmlinkage __weak long __ia32_sys_##name(const struct pt_regs *__unused)\ - { \ - return sys_ni_syscall(); \ - } +#define __IA32_COND_SYSCALL(name) \ + __COND_SYSCALL(ia32, sys_##name) #define SYS_NI(name) \ SYSCALL_ALIAS(__x64_sys_##name, sys_ni_posix_timers); \ @@ -87,8 +94,10 @@ struct pt_regs; #else /* CONFIG_IA32_EMULATION */ #define __IA32_COMPAT_SYS_STUB0(name) #define __IA32_COMPAT_SYS_STUBx(x, name, ...) +#define __IA32_COMPAT_COND_SYSCALL(name) #define __IA32_SYS_STUB0(name) #define __IA32_SYS_STUBx(x, name, ...) +#define __IA32_COND_SYSCALL(name) #endif /* CONFIG_IA32_EMULATION */ @@ -105,9 +114,12 @@ struct pt_regs; __SYS_STUBx(x32, compat_sys##name, \ SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__)) +#define __X32_COMPAT_COND_SYSCALL(name) \ + __COND_SYSCALL(x32, compat_sys_##name) #else /* CONFIG_X86_X32 */ #define __X32_COMPAT_SYS_STUB0(name) #define __X32_COMPAT_SYS_STUBx(x, name, ...) +#define __X32_COMPAT_COND_SYSCALL(name) #endif /* CONFIG_X86_X32 */ @@ -142,8 +154,8 @@ struct pt_regs; * kernel/time/posix-stubs.c to cover this case as well. */ #define COND_SYSCALL_COMPAT(name) \ - cond_syscall(__ia32_compat_sys_##name); \ - cond_syscall(__x32_compat_sys_##name) + __IA32_COMPAT_COND_SYSCALL(name) \ + __X32_COMPAT_COND_SYSCALL(name) #define COMPAT_SYS_NI(name) \ SYSCALL_ALIAS(__ia32_compat_sys_##name, sys_ni_posix_timers); \ @@ -215,13 +227,9 @@ struct pt_regs; static asmlinkage long \ __do_sys_##sname(const struct pt_regs *__unused) -#ifndef COND_SYSCALL -#define COND_SYSCALL(name) \ - asmlinkage __weak long __x64_sys_##name(const struct pt_regs *__unused) \ - { \ - return sys_ni_syscall(); \ - } -#endif +#define COND_SYSCALL(name) \ + __X64_COND_SYSCALL(name) \ + __IA32_COND_SYSCALL(name) #ifndef SYS_NI #define SYS_NI(name) SYSCALL_ALIAS(__x64_sys_##name, sys_ni_posix_timers); |