diff options
Diffstat (limited to 'arch/s390/include/asm/syscall.h')
| -rw-r--r-- | arch/s390/include/asm/syscall.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h new file mode 100644 index 000000000..27e3d804b --- /dev/null +++ b/arch/s390/include/asm/syscall.h @@ -0,0 +1,154 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Access to user system call parameters and results + * + * Copyright IBM Corp. 2008 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#ifndef _ASM_SYSCALL_H +#define _ASM_SYSCALL_H 1 + +#include <uapi/linux/audit.h> +#include <linux/sched.h> +#include <linux/err.h> +#include <asm/ptrace.h> + +extern const sys_call_ptr_t sys_call_table[]; +extern const sys_call_ptr_t sys_call_table_emu[]; + +static inline long syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + return test_pt_regs_flag(regs, PIF_SYSCALL) ? + (regs->int_code & 0xffff) : -1; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->gprs[2] = regs->orig_gpr2; +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + unsigned long error = regs->gprs[2]; +#ifdef CONFIG_COMPAT + if (test_tsk_thread_flag(task, TIF_31BIT)) { + /* + * Sign-extend the value so (int)-EFOO becomes (long)-EFOO + * and will match correctly in comparisons. + */ + error = (long)(int)error; + } +#endif + return IS_ERR_VALUE(error) ? error : 0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->gprs[2]; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + set_pt_regs_flag(regs, PIF_SYSCALL_RET_SET); + regs->gprs[2] = error ? error : val; +} + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned long *args) +{ + unsigned long mask = -1UL; + unsigned int n = 6; + +#ifdef CONFIG_COMPAT + if (test_tsk_thread_flag(task, TIF_31BIT)) + mask = 0xffffffff; +#endif + while (n-- > 0) + if (n > 0) + args[n] = regs->gprs[2 + n] & mask; + + args[0] = regs->orig_gpr2 & mask; +} + +static inline int syscall_get_arch(struct task_struct *task) +{ +#ifdef CONFIG_COMPAT + if (test_tsk_thread_flag(task, TIF_31BIT)) + return AUDIT_ARCH_S390; +#endif + return AUDIT_ARCH_S390X; +} + +static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs) +{ + return false; +} + +#define SYSCALL_FMT_0 +#define SYSCALL_FMT_1 , "0" (r2) +#define SYSCALL_FMT_2 , "d" (r3) SYSCALL_FMT_1 +#define SYSCALL_FMT_3 , "d" (r4) SYSCALL_FMT_2 +#define SYSCALL_FMT_4 , "d" (r5) SYSCALL_FMT_3 +#define SYSCALL_FMT_5 , "d" (r6) SYSCALL_FMT_4 +#define SYSCALL_FMT_6 , "d" (r7) SYSCALL_FMT_5 + +#define SYSCALL_PARM_0 +#define SYSCALL_PARM_1 , long arg1 +#define SYSCALL_PARM_2 SYSCALL_PARM_1, long arg2 +#define SYSCALL_PARM_3 SYSCALL_PARM_2, long arg3 +#define SYSCALL_PARM_4 SYSCALL_PARM_3, long arg4 +#define SYSCALL_PARM_5 SYSCALL_PARM_4, long arg5 +#define SYSCALL_PARM_6 SYSCALL_PARM_5, long arg6 + +#define SYSCALL_REGS_0 +#define SYSCALL_REGS_1 \ + register long r2 asm("2") = arg1 +#define SYSCALL_REGS_2 \ + SYSCALL_REGS_1; \ + register long r3 asm("3") = arg2 +#define SYSCALL_REGS_3 \ + SYSCALL_REGS_2; \ + register long r4 asm("4") = arg3 +#define SYSCALL_REGS_4 \ + SYSCALL_REGS_3; \ + register long r5 asm("5") = arg4 +#define SYSCALL_REGS_5 \ + SYSCALL_REGS_4; \ + register long r6 asm("6") = arg5 +#define SYSCALL_REGS_6 \ + SYSCALL_REGS_5; \ + register long r7 asm("7") = arg6 + +#define GENERATE_SYSCALL_FUNC(nr) \ +static __always_inline \ +long syscall##nr(unsigned long syscall SYSCALL_PARM_##nr) \ +{ \ + register unsigned long r1 asm ("1") = syscall; \ + register long rc asm ("2"); \ + SYSCALL_REGS_##nr; \ + \ + asm volatile ( \ + " svc 0\n" \ + : "=d" (rc) \ + : "d" (r1) SYSCALL_FMT_##nr \ + : "memory"); \ + return rc; \ +} + +GENERATE_SYSCALL_FUNC(0) +GENERATE_SYSCALL_FUNC(1) +GENERATE_SYSCALL_FUNC(2) +GENERATE_SYSCALL_FUNC(3) +GENERATE_SYSCALL_FUNC(4) +GENERATE_SYSCALL_FUNC(5) +GENERATE_SYSCALL_FUNC(6) + +#endif /* _ASM_SYSCALL_H */ |