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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2014-02-27 09:52:01 +0100 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2014-03-04 09:05:38 +0100 |
| commit | b07edab23c7f93db0e7ab09bd7f5eddc421f6e8c (patch) | |
| tree | e2234efdafec06a41c47dd705081406026122492 /arch/s390/kernel/compat_wrap.c | |
| parent | 5383d2c8b3ee61a762043818d7c07bbc0049b031 (diff) | |
s390/compat: convert system call wrappers to C part 01
Introduce a new compat_wrap.c file which contains the s390 specific compat
system call wrappers.
The s390 specific system call wrappers only perform sign, zero and pointer
conversion of system call arguments before actually calling the non-compat
system call.
Therefore introduce COMPAT_SYSCALL_WRAPx macros which generate C code that
is nearly identical to the assembly code. This has the advantage that the
compile will generate correct code, and we avoid the frequent copy-paste
errors seen in the compat_wrapper.S file.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/compat_wrap.c')
| -rw-r--r-- | arch/s390/kernel/compat_wrap.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/s390/kernel/compat_wrap.c b/arch/s390/kernel/compat_wrap.c new file mode 100644 index 000000000000..5357190c814e --- /dev/null +++ b/arch/s390/kernel/compat_wrap.c @@ -0,0 +1,35 @@ +#include <linux/syscalls.h> +#include <linux/compat.h> + +#define COMPAT_SYSCALL_WRAP1(name, ...) \ + COMPAT_SYSCALL_WRAPx(1, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP2(name, ...) \ + COMPAT_SYSCALL_WRAPx(2, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP3(name, ...) \ + COMPAT_SYSCALL_WRAPx(3, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP4(name, ...) \ + COMPAT_SYSCALL_WRAPx(4, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP5(name, ...) \ + COMPAT_SYSCALL_WRAPx(5, _##name, __VA_ARGS__) +#define COMPAT_SYSCALL_WRAP6(name, ...) \ + COMPAT_SYSCALL_WRAPx(6, _##name, __VA_ARGS__) + +#define COMPAT_SYSCALL_WRAPx(x, name, ...) \ + asmlinkage long compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \ + asmlinkage long compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ + { \ + return sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \ + } + +COMPAT_SYSCALL_WRAP1(exit, int, error_code); +COMPAT_SYSCALL_WRAP1(close, unsigned int, fd); +COMPAT_SYSCALL_WRAP2(creat, const char __user *, pathname, umode_t, mode); +COMPAT_SYSCALL_WRAP2(link, const char __user *, oldname, const char __user *, newname); +COMPAT_SYSCALL_WRAP1(unlink, const char __user *, pathname); +COMPAT_SYSCALL_WRAP1(chdir, const char __user *, filename); +COMPAT_SYSCALL_WRAP3(mknod, const char __user *, filename, umode_t, mode, unsigned, dev); +COMPAT_SYSCALL_WRAP2(chmod, const char __user *, filename, umode_t, mode); +COMPAT_SYSCALL_WRAP1(oldumount, char __user *, name); +COMPAT_SYSCALL_WRAP1(alarm, unsigned int, seconds); +COMPAT_SYSCALL_WRAP2(access, const char __user *, filename, int, mode); +COMPAT_SYSCALL_WRAP1(nice, int, increment); |