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s390: pass struct pt_regs instead of registers to syscalls

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Instead of fetching all registers from struct pt_regs and passing
them to the syscall wrappers, let the system call wrappers only
fetch the values really required.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2021-01-18 09:35:38 +01:00 committed by Vasily Gorbik
parent 39589ada1c
commit 3a790cc1c9
3 changed files with 75 additions and 51 deletions
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4
arch/s390/include/asm/processor.h
View File

@ -40,9 +40,7 @@
#include <asm/fpu/internal.h>
#include <asm/irqflags.h>
typedef long (*sys_call_ptr_t)(unsigned long, unsigned long,
unsigned long, unsigned long,
unsigned long, unsigned long);
typedef long (*sys_call_ptr_t)(struct pt_regs *regs);
static inline void set_cpu_flag(int flag)
{

114
arch/s390/include/asm/syscall_wrapper.h
View File

@ -7,6 +7,33 @@
#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_TYPE(t, a) \
__typeof(__builtin_choose_expr(sizeof(t) > 4, 0L, (t)0)) a
@ -29,14 +56,15 @@
(t)__ReS; \
})
#define __S390_SYS_STUBx(x, name, ...) \
long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __s390x_sys##name(__MAP(x,__SC_COMPAT_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
#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; \
}
/*
@ -65,23 +93,24 @@
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(__MAP(x,__SC_DECL,__VA_ARGS__)); \
long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__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(__MAP(x,__SC_LONG,__VA_ARGS__)); \
long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
} \
__diag_pop(); \
#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__))
/*
@ -113,23 +142,24 @@
#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(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(__s390x_sys##name, ERRNO); \
long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
__S390_SYS_STUBx(x, name, __VA_ARGS__) \
long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__)); \
__MAP(x,__SC_TEST,__VA_ARGS__); \
return ret; \
} \
__diag_pop(); \
#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_X86_SYSCALL_WRAPPER_H */

8
arch/s390/kernel/syscall.c
View File

@ -132,12 +132,8 @@ void do_syscall(struct pt_regs *regs)
*/
if (!test_pt_regs_flag(regs, PIF_SYSCALL_RET_SET)) {
regs->gprs[2] = -ENOSYS;
if (likely(nr < NR_syscalls)) {
regs->gprs[2] = current->thread.sys_call_table[nr](
regs->orig_gpr2, regs->gprs[3],
regs->gprs[4], regs->gprs[5],
regs->gprs[6], regs->gprs[7]);
}
if (likely(nr < NR_syscalls))
regs->gprs[2] = current->thread.sys_call_table[nr](regs);
} else {
clear_pt_regs_flag(regs, PIF_SYSCALL_RET_SET);
}