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/* SPDX-License-Identifier: GPL-2.0 */
/*
* syscall_wrapper.h - s390 specific wrappers to syscall definitions
*
*/
#ifndef _ASM_S390_SYSCALL_WRAPPER_H
#define _ASM_S390_SYSCALL_WRAPPER_H
#define __SC_TYPE(t, a) t
#define SYSCALL_PT_ARG6(regs, m, t1, t2, t3, t4, t5, t6)\
SYSCALL_PT_ARG5(regs, m, t1, t2, t3, t4, t5), \
m(t6, (regs->gprs[7]))
#define SYSCALL_PT_ARG5(regs, m, t1, t2, t3, t4, t5) \
SYSCALL_PT_ARG4(regs, m, t1, t2, t3, t4), \
m(t5, (regs->gprs[6]))
#define SYSCALL_PT_ARG4(regs, m, t1, t2, t3, t4) \
SYSCALL_PT_ARG3(regs, m, t1, t2, t3), \
m(t4, (regs->gprs[5]))
#define SYSCALL_PT_ARG3(regs, m, t1, t2, t3) \
SYSCALL_PT_ARG2(regs, m, t1, t2), \
m(t3, (regs->gprs[4]))
#define SYSCALL_PT_ARG2(regs, m, t1, t2) \
SYSCALL_PT_ARG1(regs, m, t1), \
m(t2, (regs->gprs[3]))
#define SYSCALL_PT_ARG1(regs, m, t1) \
m(t1, (regs->orig_gpr2))
#define SYSCALL_PT_ARGS(x, ...) SYSCALL_PT_ARG##x(__VA_ARGS__)
#ifdef CONFIG_COMPAT
#define __SC_COMPAT_CAST(t, a) \
({ \
long __ReS = a; \
\
BUILD_BUG_ON((sizeof(t) > 4) && !__TYPE_IS_L(t) && \
!__TYPE_IS_UL(t) && !__TYPE_IS_PTR(t) && \
!__TYPE_IS_LL(t)); \
if (__TYPE_IS_L(t)) \
__ReS = (s32)a; \
if (__TYPE_IS_UL(t)) \
__ReS = (u32)a; \
if (__TYPE_IS_PTR(t)) \
__ReS = a & 0x7fffffff; \
if (__TYPE_IS_LL(t)) \
return -ENOSYS; \
(t)__ReS; \
})
/*
* To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
* named __s390x_sys_*()
*/
#define COMPAT_SYSCALL_DEFINE0(sname) \
long __s390_compat_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO); \
long __s390_compat_sys_##sname(void)
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
long __s390x_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \
long __s390_sys_##sname(void) \
__attribute__((alias(__stringify(__s390x_sys_##sname)))); \
long __s390x_sys_##sname(void)
#define COND_SYSCALL(name) \
cond_syscall(__s390x_sys_##name); \
cond_syscall(__s390_sys_##name)
#define SYS_NI(name) \
SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers); \
SYSCALL_ALIAS(__s390_sys_##name, sys_ni_posix_timers)
#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments"); \
long __s390_compat_sys##name(struct pt_regs *regs); \
long __s390_compat_sys##name(struct pt_regs *regs) \
__attribute__((alias(__stringify(__se_compat_sys##name)))); \
ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \
static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
long __se_compat_sys##name(struct pt_regs *regs); \
long __se_compat_sys##name(struct pt_regs *regs) \
{ \
long ret = __do_compat_sys##name(SYSCALL_PT_ARGS(x, regs, __SC_DELOUSE, \
__MAP(x, __SC_TYPE, __VA_ARGS__))); \
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
} \
__diag_pop(); \
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
* COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
* kernel/time/posix-stubs.c to cover this case as well.
*/
#define COND_SYSCALL_COMPAT(name) \
cond_syscall(__s390_compat_sys_##name)
#define COMPAT_SYS_NI(name) \
SYSCALL_ALIAS(__s390_compat_sys_##name, sys_ni_posix_timers)
#define __S390_SYS_STUBx(x, name, ...) \
long __s390_sys##name(struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
long __s390_sys##name(struct pt_regs *regs) \
{ \
long ret = __do_sys##name(SYSCALL_PT_ARGS(x, regs, \
__SC_COMPAT_CAST, __MAP(x, __SC_TYPE, __VA_ARGS__))); \
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
}
#else /* CONFIG_COMPAT */
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
long __s390x_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__s390x_sys_##sname, ERRNO); \
long __s390x_sys_##sname(void)
#define COND_SYSCALL(name) \
cond_syscall(__s390x_sys_##name)
#define SYS_NI(name) \
SYSCALL_ALIAS(__s390x_sys_##name, sys_ni_posix_timers);
#define __S390_SYS_STUBx(x, fullname, name, ...)
#endif /* CONFIG_COMPAT */
#define __SYSCALL_DEFINEx(x, name, ...) \
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments"); \
long __s390x_sys##name(struct pt_regs *regs) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \
static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
long __se_sys##name(struct pt_regs *regs); \
__S390_SYS_STUBx(x, name, __VA_ARGS__) \
long __se_sys##name(struct pt_regs *regs) \
{ \
long ret = __do_sys##name(SYSCALL_PT_ARGS(x, regs, \
__SC_CAST, __MAP(x, __SC_TYPE, __VA_ARGS__))); \
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
} \
__diag_pop(); \
static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#endif /* _ASM_S390_SYSCALL_WRAPPER_H */
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