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rt-thread/components/lwp/lwp_user_mm.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-10-28 Jesven first version
* 2021-02-06 lizhirui fixed fixed vtable size problem
* 2021-02-12 lizhirui add 64-bit support for lwp_brk
* 2021-02-19 lizhirui add riscv64 support for lwp_user_accessable and lwp_get_from_user
* 2021-06-07 lizhirui modify user space bound check
*/
#include <rtthread.h>
#include <rthw.h>
#include <string.h>
#ifdef ARCH_MM_MMU
#include <lwp.h>
#include <lwp_arch.h>
#include <lwp_mm.h>
#include <lwp_user_mm.h>
#include <mm_aspace.h>
#include <mm_fault.h>
#include <mm_flag.h>
#include <mm_page.h>
#include <mmu.h>
#include <page.h>
#define DBG_TAG "LwP"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
static void _init_lwp_objs(struct rt_lwp_objs *lwp_objs, rt_aspace_t aspace);
int lwp_user_space_init(struct rt_lwp *lwp, rt_bool_t is_fork)
{
int err = -RT_ENOMEM;
lwp->lwp_obj = rt_malloc(sizeof(struct rt_lwp_objs));
_init_lwp_objs(lwp->lwp_obj, lwp->aspace);
if (lwp->lwp_obj)
{
err = arch_user_space_init(lwp);
if (!is_fork && err == RT_EOK)
{
void *addr = (void *)USER_STACK_VSTART;
err = rt_aspace_map(lwp->aspace, &addr,
USER_STACK_VEND - USER_STACK_VSTART,
MMU_MAP_U_RWCB, 0, &lwp->lwp_obj->mem_obj, 0);
}
}
return err;
}
void lwp_aspace_switch(struct rt_thread *thread)
{
struct rt_lwp *lwp = RT_NULL;
rt_aspace_t aspace;
void *from_tbl;
if (thread->lwp)
{
lwp = (struct rt_lwp *)thread->lwp;
aspace = lwp->aspace;
}
else
aspace = &rt_kernel_space;
from_tbl = rt_hw_mmu_tbl_get();
if (aspace->page_table != from_tbl)
{
rt_hw_aspace_switch(aspace);
}
}
void lwp_unmap_user_space(struct rt_lwp *lwp)
{
arch_user_space_free(lwp);
rt_free(lwp->lwp_obj);
}
static const char *user_get_name(rt_varea_t varea)
{
char *name;
if (varea->flag & MMF_TEXT)
{
name = "user.text";
}
else
{
if (varea->start == (void *)USER_STACK_VSTART)
{
name = "user.stack";
}
else if (varea->start >= (void *)USER_HEAP_VADDR &&
varea->start < (void *)USER_HEAP_VEND)
{
name = "user.heap";
}
else
{
name = "user.data";
}
}
return name;
}
static void _user_do_page_fault(struct rt_varea *varea,
struct rt_mm_fault_msg *msg)
{
struct rt_lwp_objs *lwp_objs;
lwp_objs = rt_container_of(varea->mem_obj, struct rt_lwp_objs, mem_obj);
if (lwp_objs->source)
{
void *paddr = rt_hw_mmu_v2p(lwp_objs->source, msg->vaddr);
if (paddr != ARCH_MAP_FAILED)
{
void *vaddr;
vaddr = paddr - PV_OFFSET;
if (!(varea->flag & MMF_TEXT))
{
void *cp = rt_pages_alloc(0);
if (cp)
{
memcpy(cp, vaddr, ARCH_PAGE_SIZE);
rt_varea_insert_page(varea, cp);
msg->response.status = MM_FAULT_STATUS_OK;
msg->response.vaddr = cp;
msg->response.size = ARCH_PAGE_SIZE;
}
else
{
LOG_W("%s: page alloc failed at %p", __func__,
varea->start);
}
}
else
{
rt_page_t page = rt_page_addr2page(vaddr);
page->ref_cnt += 1;
rt_varea_insert_page(varea, vaddr);
msg->response.status = MM_FAULT_STATUS_OK;
msg->response.vaddr = vaddr;
msg->response.size = ARCH_PAGE_SIZE;
}
}
else if (!(varea->flag & MMF_TEXT))
{
/* if data segment not exist in source do a fallback */
rt_mm_dummy_mapper.on_page_fault(varea, msg);
}
}
else /* if (!lwp_objs->source), no aspace as source data */
{
rt_mm_dummy_mapper.on_page_fault(varea, msg);
}
}
static void _init_lwp_objs(struct rt_lwp_objs *lwp_objs, rt_aspace_t aspace)
{
lwp_objs->source = NULL;
lwp_objs->mem_obj.get_name = user_get_name;
lwp_objs->mem_obj.hint_free = NULL;
lwp_objs->mem_obj.on_page_fault = _user_do_page_fault;
lwp_objs->mem_obj.on_page_offload = rt_mm_dummy_mapper.on_page_offload;
lwp_objs->mem_obj.on_varea_open = rt_mm_dummy_mapper.on_varea_open;
lwp_objs->mem_obj.on_varea_close = rt_mm_dummy_mapper.on_varea_close;
}
static void *_lwp_map_user(struct rt_lwp *lwp, void *map_va, size_t map_size,
int text)
{
void *va = map_va;
int ret = 0;
size_t flags = MMF_PREFETCH;
if (text)
flags |= MMF_TEXT;
rt_mem_obj_t mem_obj = &lwp->lwp_obj->mem_obj;
ret = rt_aspace_map(lwp->aspace, &va, map_size, MMU_MAP_U_RWCB, flags,
mem_obj, 0);
if (ret != RT_EOK)
{
va = RT_NULL;
LOG_I("lwp_map_user: failed to map %lx with size %lx with errno %d", map_va,
map_size, ret);
}
return va;
}
int lwp_unmap_user(struct rt_lwp *lwp, void *va)
{
int err;
err = rt_aspace_unmap(lwp->aspace, va, 1);
return err;
}
static void _dup_varea(rt_varea_t varea, struct rt_lwp *src_lwp,
rt_aspace_t dst)
{
void *vaddr = varea->start;
void *vend = vaddr + varea->size;
if (vaddr < (void *)USER_STACK_VSTART || vaddr >= (void *)USER_STACK_VEND)
{
while (vaddr != vend)
{
void *paddr;
paddr = lwp_v2p(src_lwp, vaddr);
if (paddr != ARCH_MAP_FAILED)
{
rt_aspace_load_page(dst, vaddr, 1);
}
vaddr += ARCH_PAGE_SIZE;
}
}
else
{
while (vaddr != vend)
{
vend -= ARCH_PAGE_SIZE;
void *paddr;
paddr = lwp_v2p(src_lwp, vend);
if (paddr != ARCH_MAP_FAILED)
{
rt_aspace_load_page(dst, vend, 1);
}
else
{
break;
}
}
}
}
int lwp_dup_user(rt_varea_t varea, void *arg)
{
int err;
struct rt_lwp *self_lwp = lwp_self();
struct rt_lwp *new_lwp = (struct rt_lwp *)arg;
void *pa = RT_NULL;
void *va = RT_NULL;
rt_mem_obj_t mem_obj = varea->mem_obj;
if (!mem_obj)
{
/* duplicate a physical mapping */
pa = lwp_v2p(self_lwp, (void *)varea->start);
RT_ASSERT(pa != ARCH_MAP_FAILED);
struct rt_mm_va_hint hint = {.flags = MMF_MAP_FIXED,
.limit_range_size = new_lwp->aspace->size,
.limit_start = new_lwp->aspace->start,
.prefer = varea->start,
.map_size = varea->size};
err = rt_aspace_map_phy(new_lwp->aspace, &hint, varea->attr,
MM_PA_TO_OFF(pa), &va);
if (err != RT_EOK)
{
LOG_W("%s: aspace map failed at %p with size %p", __func__,
varea->start, varea->size);
}
}
else
{
/* duplicate a mem_obj backing mapping */
va = varea->start;
err = rt_aspace_map(new_lwp->aspace, &va, varea->size, varea->attr,
varea->flag, &new_lwp->lwp_obj->mem_obj,
varea->offset);
if (err != RT_EOK)
{
LOG_W("%s: aspace map failed at %p with size %p", __func__,
varea->start, varea->size);
}
else
{
/* loading page frames for !MMF_PREFETCH varea */
if (!(varea->flag & MMF_PREFETCH))
{
_dup_varea(varea, self_lwp, new_lwp->aspace);
}
}
}
if (va != (void *)varea->start)
{
return -1;
}
return 0;
}
int lwp_unmap_user_phy(struct rt_lwp *lwp, void *va)
{
return lwp_unmap_user(lwp, va);
}
void *lwp_map_user(struct rt_lwp *lwp, void *map_va, size_t map_size, int text)
{
void *ret = RT_NULL;
size_t offset = 0;
if (!map_size)
{
return 0;
}
offset = (size_t)map_va & ARCH_PAGE_MASK;
map_size += (offset + ARCH_PAGE_SIZE - 1);
map_size &= ~ARCH_PAGE_MASK;
map_va = (void *)((size_t)map_va & ~ARCH_PAGE_MASK);
ret = _lwp_map_user(lwp, map_va, map_size, text);
if (ret)
{
ret = (void *)((char *)ret + offset);
}
return ret;
}
void *lwp_map_user_phy(struct rt_lwp *lwp, void *map_va, void *map_pa,
size_t map_size, int cached)
{
int err;
void *va;
size_t offset = 0;
if (!map_size)
{
return 0;
}
if (map_va)
{
if (((size_t)map_va & ARCH_PAGE_MASK) !=
((size_t)map_pa & ARCH_PAGE_MASK))
{
return 0;
}
}
offset = (size_t)map_pa & ARCH_PAGE_MASK;
map_size += (offset + ARCH_PAGE_SIZE - 1);
map_size &= ~ARCH_PAGE_MASK;
map_pa = (void *)((size_t)map_pa & ~ARCH_PAGE_MASK);
struct rt_mm_va_hint hint = {.flags = MMF_MAP_FIXED,
.limit_range_size = lwp->aspace->size,
.limit_start = lwp->aspace->start,
.prefer = map_va,
.map_size = map_size};
rt_size_t attr = cached ? MMU_MAP_U_RWCB : MMU_MAP_U_RW;
err =
rt_aspace_map_phy(lwp->aspace, &hint, attr, MM_PA_TO_OFF(map_pa), &va);
if (err != RT_EOK)
{
va = RT_NULL;
LOG_W("%s", __func__);
}
else
{
va += offset;
}
return va;
}
rt_base_t lwp_brk(void *addr)
{
rt_base_t ret = -1;
struct rt_lwp *lwp = RT_NULL;
rt_mm_lock();
lwp = rt_thread_self()->lwp;
if ((size_t)addr <= lwp->end_heap)
{
ret = (rt_base_t)lwp->end_heap;
}
else
{
size_t size = 0;
void *va = RT_NULL;
if ((size_t)addr <= USER_HEAP_VEND)
{
size = (((size_t)addr - lwp->end_heap) + ARCH_PAGE_SIZE - 1) &
~ARCH_PAGE_MASK;
va = lwp_map_user(lwp, (void *)lwp->end_heap, size, 0);
}
if (va)
{
lwp->end_heap += size;
ret = lwp->end_heap;
}
}
rt_mm_unlock();
return ret;
}
#define MAP_ANONYMOUS 0x20
void *lwp_mmap2(void *addr, size_t length, int prot, int flags, int fd,
off_t pgoffset)
{
void *ret = (void *)-1;
if (fd == -1)
{
ret = lwp_map_user(lwp_self(), addr, length, 0);
if (ret)
{
if ((flags & MAP_ANONYMOUS) != 0)
{
rt_memset(ret, 0, length);
}
}
else
{
ret = (void *)-1;
}
}
else
{
struct dfs_fd *d;
d = fd_get(fd);
if (d && d->vnode->type == FT_DEVICE)
{
struct dfs_mmap2_args mmap2;
mmap2.addr = addr;
mmap2.length = length;
mmap2.prot = prot;
mmap2.flags = flags;
mmap2.pgoffset = pgoffset;
mmap2.ret = (void *)-1;
if (dfs_file_mmap2(d, &mmap2) == 0)
{
ret = mmap2.ret;
}
}
}
return ret;
}
int lwp_munmap(void *addr)
{
int ret = 0;
rt_mm_lock();
ret = lwp_unmap_user(lwp_self(), addr);
rt_mm_unlock();
return ret;
}
size_t lwp_get_from_user(void *dst, void *src, size_t size)
{
struct rt_lwp *lwp = RT_NULL;
/* check src */
if (src < (void *)USER_VADDR_START)
{
return 0;
}
if (src >= (void *)USER_VADDR_TOP)
{
return 0;
}
if ((void *)((char *)src + size) > (void *)USER_VADDR_TOP)
{
return 0;
}
lwp = lwp_self();
if (!lwp)
{
return 0;
}
return lwp_data_get(lwp, dst, src, size);
}
size_t lwp_put_to_user(void *dst, void *src, size_t size)
{
struct rt_lwp *lwp = RT_NULL;
/* check dst */
if (dst < (void *)USER_VADDR_START)
{
return 0;
}
if (dst >= (void *)USER_VADDR_TOP)
{
return 0;
}
if ((void *)((char *)dst + size) > (void *)USER_VADDR_TOP)
{
return 0;
}
lwp = lwp_self();
if (!lwp)
{
return 0;
}
return lwp_data_put(lwp, dst, src, size);
}
int lwp_user_accessable(void *addr, size_t size)
{
void *addr_start = RT_NULL, *addr_end = RT_NULL, *next_page = RT_NULL;
void *tmp_addr = RT_NULL;
struct rt_lwp *lwp = lwp_self();
if (!lwp)
{
return 0;
}
if (!size || !addr)
{
return 0;
}
addr_start = addr;
addr_end = (void *)((char *)addr + size);
#ifdef ARCH_RISCV64
if (addr_start < (void *)USER_VADDR_START)
{
return 0;
}
#else
if (addr_start >= (void *)USER_VADDR_TOP)
{
return 0;
}
if (addr_end > (void *)USER_VADDR_TOP)
{
return 0;
}
#endif
next_page =
(void *)(((size_t)addr_start + ARCH_PAGE_SIZE) & ~(ARCH_PAGE_SIZE - 1));
do
{
size_t len = (char *)next_page - (char *)addr_start;
if (size < len)
{
len = size;
}
tmp_addr = lwp_v2p(lwp, addr_start);
if (tmp_addr == ARCH_MAP_FAILED)
{
if ((rt_ubase_t)addr_start >= USER_STACK_VSTART && (rt_ubase_t)addr_start < USER_STACK_VEND)
tmp_addr = *(void **)addr_start;
else
return 0;
}
addr_start = (void *)((char *)addr_start + len);
size -= len;
next_page = (void *)((char *)next_page + ARCH_PAGE_SIZE);
} while (addr_start < addr_end);
return 1;
}
/* src is in mmu_info space, dst is in current thread space */
size_t lwp_data_get(struct rt_lwp *lwp, void *dst, void *src, size_t size)
{
size_t copy_len = 0;
void *addr_start = RT_NULL, *addr_end = RT_NULL, *next_page = RT_NULL;
void *tmp_dst = RT_NULL, *tmp_src = RT_NULL;
if (!size || !dst)
{
return 0;
}
tmp_dst = dst;
addr_start = src;
addr_end = (void *)((char *)src + size);
next_page =
(void *)(((size_t)addr_start + ARCH_PAGE_SIZE) & ~(ARCH_PAGE_SIZE - 1));
do
{
size_t len = (char *)next_page - (char *)addr_start;
if (size < len)
{
len = size;
}
tmp_src = lwp_v2p(lwp, addr_start);
if (tmp_src == ARCH_MAP_FAILED)
{
break;
}
tmp_src = (void *)((char *)tmp_src - PV_OFFSET);
rt_memcpy(tmp_dst, tmp_src, len);
tmp_dst = (void *)((char *)tmp_dst + len);
addr_start = (void *)((char *)addr_start + len);
size -= len;
next_page = (void *)((char *)next_page + ARCH_PAGE_SIZE);
copy_len += len;
} while (addr_start < addr_end);
return copy_len;
}
/* dst is in kernel space, src is in current thread space */
size_t lwp_data_put(struct rt_lwp *lwp, void *dst, void *src, size_t size)
{
size_t copy_len = 0;
void *addr_start = RT_NULL, *addr_end = RT_NULL, *next_page = RT_NULL;
void *tmp_dst = RT_NULL, *tmp_src = RT_NULL;
if (!size || !dst)
{
return 0;
}
tmp_src = src;
addr_start = dst;
addr_end = (void *)((char *)dst + size);
next_page =
(void *)(((size_t)addr_start + ARCH_PAGE_SIZE) & ~(ARCH_PAGE_SIZE - 1));
do
{
size_t len = (char *)next_page - (char *)addr_start;
if (size < len)
{
len = size;
}
tmp_dst = lwp_v2p(lwp, addr_start);
if (tmp_dst == ARCH_MAP_FAILED)
{
break;
}
tmp_dst = (void *)((char *)tmp_dst - PV_OFFSET);
rt_memcpy(tmp_dst, tmp_src, len);
tmp_src = (void *)((char *)tmp_src + len);
addr_start = (void *)((char *)addr_start + len);
size -= len;
next_page = (void *)((char *)next_page + ARCH_PAGE_SIZE);
copy_len += len;
} while (addr_start < addr_end);
return copy_len;
}
#endif
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