diff options
Diffstat (limited to 'arch/arm64/include/asm/syscall.h')
| -rw-r--r-- | arch/arm64/include/asm/syscall.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index ab8e14b96f68..712daa90e643 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -61,6 +61,22 @@ static inline void syscall_set_return_value(struct task_struct *task, regs->regs[0] = val; } +static inline void syscall_set_nr(struct task_struct *task, + struct pt_regs *regs, + int nr) +{ + regs->syscallno = nr; + if (nr == -1) { + /* + * When the syscall number is set to -1, the syscall will be + * skipped. In this case the syscall return value has to be + * set explicitly, otherwise the first syscall argument is + * returned as the syscall return value. + */ + syscall_set_return_value(task, regs, -ENOSYS, 0); + } +} + #define SYSCALL_MAX_ARGS 6 static inline void syscall_get_arguments(struct task_struct *task, @@ -73,6 +89,19 @@ static inline void syscall_get_arguments(struct task_struct *task, memcpy(args, ®s->regs[1], 5 * sizeof(args[0])); } +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + const unsigned long *args) +{ + memcpy(®s->regs[0], args, 6 * sizeof(args[0])); + /* + * Also copy the first argument into orig_x0 + * so that syscall_get_arguments() would return it + * instead of the previous value. + */ + regs->orig_x0 = regs->regs[0]; +} + /* * We don't care about endianness (__AUDIT_ARCH_LE bit) here because * AArch64 has the same system calls both on little- and big- endian. |