syscall_rollback — roll back registers after an aborted system call
void syscall_rollback ( | struct task_struct * task, |
struct pt_regs * regs); |
It's only valid to call this when task is stopped for system
call exit tracing (due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT),
after tracehook_report_syscall_entry returned nonzero to prevent
the system call from taking place.
This rolls back the register state in regs so it's as if the
system call instruction was a no-op. The registers containing
the system call number and arguments are as they were before the
system call instruction. This may not be the same as what the
register state looked like at system call entry tracing.