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s390/compat: convert system call wrappers to C part 01

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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>
This commit is contained in:
Heiko Carstens
2014-02-27 09:52:01 +01:00
parent 5383d2c8b3
commit b07edab23c
4 changed files with 48 additions and 68 deletions
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24
arch/s390/kernel/syscalls.S
View File

@@ -9,40 +9,40 @@
#define NI_SYSCALL SYSCALL(sys_ni_syscall,sys_ni_syscall,sys_ni_syscall)
NI_SYSCALL /* 0 */
SYSCALL(sys_exit,sys_exit,sys32_exit_wrapper)
SYSCALL(sys_exit,sys_exit,compat_sys_exit)
SYSCALL(sys_fork,sys_fork,sys_fork)
SYSCALL(sys_read,sys_read,compat_sys_s390_read)
SYSCALL(sys_write,sys_write,compat_sys_s390_write)
SYSCALL(sys_open,sys_open,compat_sys_open) /* 5 */
SYSCALL(sys_close,sys_close,sys32_close_wrapper)
SYSCALL(sys_close,sys_close,compat_sys_close)
SYSCALL(sys_restart_syscall,sys_restart_syscall,sys_restart_syscall)
SYSCALL(sys_creat,sys_creat,sys32_creat_wrapper)
SYSCALL(sys_link,sys_link,sys32_link_wrapper)
SYSCALL(sys_unlink,sys_unlink,sys32_unlink_wrapper) /* 10 */
SYSCALL(sys_creat,sys_creat,compat_sys_creat)
SYSCALL(sys_link,sys_link,compat_sys_link)
SYSCALL(sys_unlink,sys_unlink,compat_sys_unlink) /* 10 */
SYSCALL(sys_execve,sys_execve,sys32_execve_wrapper)
SYSCALL(sys_chdir,sys_chdir,sys32_chdir_wrapper)
SYSCALL(sys_chdir,sys_chdir,compat_sys_chdir)
SYSCALL(sys_time,sys_ni_syscall,sys32_time_wrapper) /* old time syscall */
SYSCALL(sys_mknod,sys_mknod,sys32_mknod_wrapper)
SYSCALL(sys_chmod,sys_chmod,sys32_chmod_wrapper) /* 15 */
SYSCALL(sys_mknod,sys_mknod,compat_sys_mknod)
SYSCALL(sys_chmod,sys_chmod,compat_sys_chmod) /* 15 */
SYSCALL(sys_lchown16,sys_ni_syscall,compat_sys_s390_lchown16) /* old lchown16 syscall*/
NI_SYSCALL /* old break syscall holder */
NI_SYSCALL /* old stat syscall holder */
SYSCALL(sys_lseek,sys_lseek,compat_sys_lseek)
SYSCALL(sys_getpid,sys_getpid,sys_getpid) /* 20 */
SYSCALL(sys_mount,sys_mount,sys32_mount_wrapper)
SYSCALL(sys_oldumount,sys_oldumount,sys32_oldumount_wrapper)
SYSCALL(sys_oldumount,sys_oldumount,compat_sys_oldumount)
SYSCALL(sys_setuid16,sys_ni_syscall,compat_sys_s390_setuid16) /* old setuid16 syscall*/
SYSCALL(sys_getuid16,sys_ni_syscall,compat_sys_s390_getuid16) /* old getuid16 syscall*/
SYSCALL(sys_stime,sys_ni_syscall,sys32_stime_wrapper) /* 25 old stime syscall */
SYSCALL(sys_ptrace,sys_ptrace,sys32_ptrace_wrapper)
SYSCALL(sys_alarm,sys_alarm,sys32_alarm_wrapper)
SYSCALL(sys_alarm,sys_alarm,compat_sys_alarm)
NI_SYSCALL /* old fstat syscall */
SYSCALL(sys_pause,sys_pause,sys_pause)
SYSCALL(sys_utime,sys_utime,compat_sys_utime_wrapper) /* 30 */
NI_SYSCALL /* old stty syscall */
NI_SYSCALL /* old gtty syscall */
SYSCALL(sys_access,sys_access,sys32_access_wrapper)
SYSCALL(sys_nice,sys_nice,sys32_nice_wrapper)
SYSCALL(sys_access,sys_access,compat_sys_access)
SYSCALL(sys_nice,sys_nice,compat_sys_nice)
NI_SYSCALL /* 35 old ftime syscall */
SYSCALL(sys_sync,sys_sync,sys_sync)
SYSCALL(sys_kill,sys_kill,sys32_kill_wrapper)