void hugetlb_prefault_arch_hook(struct mm_struct *mm) { struct tsb_config *tp = &mm->context.tsb_block[MM_TSB_HUGE]; if (likely(tp->tsb != NULL)) return; tsb_grow(mm, MM_TSB_HUGE, 0); tsb_context_switch(mm); smp_tsb_sync(mm); /* On UltraSPARC-III+ and later, configure the second half of * the Data-TLB for huge pages. */ if (tlb_type == cheetah_plus) { unsigned long ctx; spin_lock(&ctx_alloc_lock); ctx = mm->context.sparc64_ctx_val; ctx &= ~CTX_PGSZ_MASK; ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT; ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT; if (ctx != mm->context.sparc64_ctx_val) { /* When changing the page size fields, we * must perform a context flush so that no * stale entries match. This flush must * occur with the original context register * settings. */ do_flush_tlb_mm(mm); /* Reload the context register of all processors * also executing in this address space. */ mm->context.sparc64_ctx_val = ctx; on_each_cpu(context_reload, mm, 0); } spin_unlock(&ctx_alloc_lock); } }
static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs) { struct exec ex; unsigned long error; unsigned long fd_offset; unsigned long rlim; unsigned long orig_thr_flags; int retval; ex = *((struct exec *) bprm->buf); /* exec-header */ if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) || N_TRSIZE(ex) || N_DRSIZE(ex) || bprm->file->f_path.dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { return -ENOEXEC; } fd_offset = N_TXTOFF(ex); /* Check initial limits. This avoids letting people circumvent * size limits imposed on them by creating programs with large * arrays in the data or bss. */ rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; if (rlim >= RLIM_INFINITY) rlim = ~0; if (ex.a_data + ex.a_bss > rlim) return -ENOMEM; /* Flush all traces of the currently running executable */ retval = flush_old_exec(bprm); if (retval) return retval; /* OK, This is the point of no return */ set_personality(PER_SUNOS); current->mm->end_code = ex.a_text + (current->mm->start_code = N_TXTADDR(ex)); current->mm->end_data = ex.a_data + (current->mm->start_data = N_DATADDR(ex)); current->mm->brk = ex.a_bss + (current->mm->start_brk = N_BSSADDR(ex)); current->mm->free_area_cache = current->mm->mmap_base; current->mm->cached_hole_size = 0; current->mm->mmap = NULL; compute_creds(bprm); current->flags &= ~PF_FORKNOEXEC; if (N_MAGIC(ex) == NMAGIC) { loff_t pos = fd_offset; /* F**k me plenty... */ down_write(¤t->mm->mmap_sem); error = do_brk(N_TXTADDR(ex), ex.a_text); up_write(¤t->mm->mmap_sem); bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex), ex.a_text, &pos); down_write(¤t->mm->mmap_sem); error = do_brk(N_DATADDR(ex), ex.a_data); up_write(¤t->mm->mmap_sem); bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex), ex.a_data, &pos); goto beyond_if; } if (N_MAGIC(ex) == OMAGIC) { loff_t pos = fd_offset; down_write(¤t->mm->mmap_sem); do_brk(N_TXTADDR(ex) & PAGE_MASK, ex.a_text+ex.a_data + PAGE_SIZE - 1); up_write(¤t->mm->mmap_sem); bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex), ex.a_text+ex.a_data, &pos); } else { static unsigned long error_time; if ((ex.a_text & 0xfff || ex.a_data & 0xfff) && (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ) { printk(KERN_NOTICE "executable not page aligned\n"); error_time = jiffies; } if (!bprm->file->f_op->mmap) { loff_t pos = fd_offset; down_write(¤t->mm->mmap_sem); do_brk(0, ex.a_text+ex.a_data); up_write(¤t->mm->mmap_sem); bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex), ex.a_text+ex.a_data, &pos); goto beyond_if; } down_write(¤t->mm->mmap_sem); error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text, PROT_READ | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, fd_offset); up_write(¤t->mm->mmap_sem); if (error != N_TXTADDR(ex)) { send_sig(SIGKILL, current, 0); return error; } down_write(¤t->mm->mmap_sem); error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, fd_offset + ex.a_text); up_write(¤t->mm->mmap_sem); if (error != N_DATADDR(ex)) { send_sig(SIGKILL, current, 0); return error; } } beyond_if: set_binfmt(&aout32_format); set_brk(current->mm->start_brk, current->mm->brk); /* Make sure STACK_TOP returns the right thing. */ orig_thr_flags = current_thread_info()->flags; current_thread_info()->flags |= _TIF_32BIT; retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); if (retval < 0) { current_thread_info()->flags = orig_thr_flags; /* Someone check-me: is this error path enough? */ send_sig(SIGKILL, current, 0); return retval; } current->mm->start_stack = (unsigned long) create_aout32_tables((char __user *)bprm->p, bprm); tsb_context_switch(current->mm); start_thread32(regs, ex.a_entry, current->mm->start_stack); if (current->ptrace & PT_PTRACED) send_sig(SIGTRAP, current, 0); return 0; }