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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 OSCAR lab, Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_mmap.c
- *
- * Implementation of system call "mmap", "munmap" and "mprotect".
- */
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_handle.h>
- #include <shim_vma.h>
- #include <shim_fs.h>
- #include <shim_profile.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <sys/mman.h>
- #include <errno.h>
- DEFINE_PROFILE_OCCURENCE(mmap, memory);
- void * shim_do_mmap (void * addr, size_t length, int prot, int flags, int fd,
- off_t offset)
- {
- struct shim_handle * hdl = NULL;
- long ret = -ENOMEM;
- assert(!(flags & (VMA_UNMAPPED|VMA_TAINTED)));
- int pal_alloc_type = ((flags & MAP_32BIT) ? PAL_ALLOC_32BIT : 0);
- int pal_prot = prot;
- addr = addr ? : get_unmapped_vma(ALIGN_UP(length), flags);
- void * mapped = ALIGN_DOWN((void *) addr);
- void * mapped_end = ALIGN_UP((void *) addr + length);
- addr = mapped;
- length = mapped_end - mapped;
- if (flags & MAP_ANONYMOUS) {
- addr = DkVirtualMemoryAlloc(addr, length, pal_alloc_type,
- pal_prot);
- if (!addr)
- return (void *) -PAL_ERRNO;
- ADD_PROFILE_OCCURENCE(mmap, length);
- } else {
- if (fd < 0)
- return (void *) -EINVAL;
- hdl = get_fd_handle(fd, NULL, NULL);
- if (!hdl)
- return (void *) -EBADF;
- if (!hdl->fs || !hdl->fs->fs_ops || !hdl->fs->fs_ops->mmap) {
- put_handle(hdl);
- return (void *) -ENODEV;
- }
- if (flags & MAP_PRIVATE)
- prot |= PAL_PROT_WRITECOPY;
- if ((ret = hdl->fs->fs_ops->mmap(hdl, &addr, length, prot,
- flags, offset)) < 0) {
- put_handle(hdl);
- return (void *) ret;
- }
- }
- if (addr != mapped) {
- mapped = ALIGN_DOWN((void *) addr);
- mapped_end = ALIGN_UP((void *) addr + length);
- }
- ret = bkeep_mmap((void *) mapped, mapped_end - mapped, prot,
- flags, hdl, offset, "user");
- assert(!ret);
- if (hdl)
- put_handle(hdl);
- return addr;
- }
- int shim_do_mprotect (void * addr, size_t len, int prot)
- {
- uintptr_t mapped = ALIGN_DOWN((uintptr_t) addr);
- uintptr_t mapped_end = ALIGN_UP((uintptr_t) addr + len);
- int flags = 0;
- if (bkeep_mprotect((void *) mapped, mapped_end - mapped, prot, &flags) < 0)
- return -EACCES;
- if (!DkVirtualMemoryProtect((void *) mapped, mapped_end - mapped, prot))
- return -PAL_ERRNO;
- return 0;
- }
- int shim_do_munmap (void * addr, size_t len)
- {
- struct shim_vma * tmp = NULL;
- if (lookup_overlap_vma(addr, len, &tmp) < 0) {
- debug("can't find addr %p - %p in map, quit unmapping\n",
- addr, addr + len);
- /* Really not an error */
- return -EFAULT;
- }
- uintptr_t mapped = ALIGN_DOWN((uintptr_t) addr);
- uintptr_t mapped_end = ALIGN_UP((uintptr_t) addr + len);
- int flags = 0;
- if (bkeep_munmap((void *) mapped, mapped_end - mapped, &flags) < 0)
- return -EACCES;
- DkVirtualMemoryFree((void *) mapped, mapped_end - mapped);
- return 0;
- }
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