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module.c
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2027 lines (1730 loc) · 58.9 KB
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/*
* File : module.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2010-01-09 Bernard first version
* 2010-04-09 yi.qiu implement based on first version
* 2010-10-23 yi.qiu implement module memory allocator
* 2011-05-25 yi.qiu implement module hook function
* 2011-06-23 yi.qiu rewrite module memory allocator
* 2012-11-23 Bernard using RT_DEBUG_LOG instead of rt_kprintf.
* 2012-11-28 Bernard remove rt_current_module and user
* can use rt_module_unload to remove a module.
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtm.h>
#ifdef RT_USING_FINSH
#include <finsh.h>
#endif
#ifdef RT_USING_MODULE
#include "module.h"
#define elf_module ((Elf32_Ehdr *)module_ptr)
#define shdr ((Elf32_Shdr *)((rt_uint8_t *)module_ptr + elf_module->e_shoff))
#define phdr ((Elf32_Phdr *)((rt_uint8_t *)module_ptr + elf_module->e_phoff))
#define IS_PROG(s) (s.sh_type == SHT_PROGBITS)
#define IS_NOPROG(s) (s.sh_type == SHT_NOBITS)
#define IS_REL(s) (s.sh_type == SHT_REL)
#define IS_RELA(s) (s.sh_type == SHT_RELA)
#define IS_ALLOC(s) (s.sh_flags == SHF_ALLOC)
#define IS_AX(s) ((s.sh_flags & SHF_ALLOC) && (s.sh_flags & SHF_EXECINSTR))
#define IS_AW(s) ((s.sh_flags & SHF_ALLOC) && (s.sh_flags & SHF_WRITE))
#ifdef RT_USING_MODULE_STKSZ
#undef RT_USING_MODULE_STKSZ
#endif
#ifndef RT_USING_MODULE_STKSZ
#define RT_USING_MODULE_STKSZ (4096 * 2)
#endif
#ifndef RT_USING_MODULE_PRIO
#define RT_USING_MODULE_PRIO (RT_THREAD_PRIORITY_MAX - 2)
#endif
#ifdef RT_USING_SLAB
#define PAGE_COUNT_MAX 256
/* module memory allocator */
struct rt_mem_head
{
rt_size_t size; /* size of memory block */
struct rt_mem_head *next; /* next valid memory block */
};
struct rt_page_info
{
rt_uint32_t *page_ptr;
rt_uint32_t npage;
};
static void *rt_module_malloc_page(rt_size_t npages);
static void rt_module_free_page(rt_module_t module,
void *page_ptr,
rt_size_t npages);
static struct rt_semaphore mod_sem;
#endif
static struct rt_module_symtab *_rt_module_symtab_begin = RT_NULL;
static struct rt_module_symtab *_rt_module_symtab_end = RT_NULL;
#if defined(__IAR_SYSTEMS_ICC__) /* for IAR compiler */
#pragma section="RTMSymTab"
#endif
/**
* @ingroup SystemInit
*
* This function will initialize system module
*/
int rt_system_module_init(void)
{
#if defined(__GNUC__) && !defined(__CC_ARM)
extern int __rtmsymtab_start;
extern int __rtmsymtab_end;
_rt_module_symtab_begin = (struct rt_module_symtab *)&__rtmsymtab_start;
_rt_module_symtab_end = (struct rt_module_symtab *)&__rtmsymtab_end;
#elif defined (__CC_ARM)
extern int RTMSymTab$$Base;
extern int RTMSymTab$$Limit;
_rt_module_symtab_begin = (struct rt_module_symtab *)&RTMSymTab$$Base;
_rt_module_symtab_end = (struct rt_module_symtab *)&RTMSymTab$$Limit;
#elif defined (__IAR_SYSTEMS_ICC__)
_rt_module_symtab_begin = __section_begin("RTMSymTab");
_rt_module_symtab_end = __section_begin("RTMSymTab");
#endif
#ifdef RT_USING_SLAB
/* initialize heap semaphore */
rt_sem_init(&mod_sem, "module", 1, RT_IPC_FLAG_FIFO);
#endif
return 0;
}
INIT_COMPONENT_EXPORT(rt_system_module_init);
#ifdef RT_USING_FINSH
void list_symbol(void)
{
/* find in kernel symbol table */
struct rt_module_symtab *index;
for (index = _rt_module_symtab_begin;
index != _rt_module_symtab_end;
index ++)
{
rt_kprintf("%s\n", index->name);
}
return ;
}
FINSH_FUNCTION_EXPORT(list_symbol, list symbol for module);
MSH_CMD_EXPORT(list_symbol, list symbol for module);
#endif
static rt_uint32_t rt_module_symbol_find(const char *sym_str)
{
/* find in kernel symbol table */
struct rt_module_symtab *index;
for (index = _rt_module_symtab_begin;
index != _rt_module_symtab_end;
index ++)
{
if (rt_strcmp(index->name, sym_str) == 0)
return (rt_uint32_t)index->addr;
}
return 0;
}
/**
* This function will return self module object
*
* @return the self module object
*/
rt_module_t rt_module_self(void)
{
rt_thread_t tid;
tid = rt_thread_self();
if (tid == RT_NULL)
return RT_NULL;
/* return current module */
return (rt_module_t)tid->module_id;
}
RTM_EXPORT(rt_module_self);
static int rt_module_arm_relocate(struct rt_module *module,
Elf32_Rel *rel,
Elf32_Addr sym_val)
{
Elf32_Addr *where, tmp;
Elf32_Sword addend, offset;
rt_uint32_t upper, lower, sign, j1, j2;
where = (Elf32_Addr *)((rt_uint8_t *)module->module_space
+ rel->r_offset
- module->vstart_addr);
switch (ELF32_R_TYPE(rel->r_info))
{
case R_ARM_NONE:
break;
case R_ARM_ABS32:
*where += (Elf32_Addr)sym_val;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_ARM_ABS32: %x -> %x\n",
where, *where));
break;
case R_ARM_PC24:
case R_ARM_PLT32:
case R_ARM_CALL:
case R_ARM_JUMP24:
addend = *where & 0x00ffffff;
if (addend & 0x00800000)
addend |= 0xff000000;
tmp = sym_val - (Elf32_Addr)where + (addend << 2);
tmp >>= 2;
*where = (*where & 0xff000000) | (tmp & 0x00ffffff);
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_ARM_PC24: %x -> %x\n",
where, *where));
break;
case R_ARM_REL32:
*where += sym_val - (Elf32_Addr)where;
RT_DEBUG_LOG(RT_DEBUG_MODULE,
("R_ARM_REL32: %x -> %x, sym %x, offset %x\n",
where, *where, sym_val, rel->r_offset));
break;
case R_ARM_V4BX:
*where &= 0xf000000f;
*where |= 0x01a0f000;
break;
case R_ARM_GLOB_DAT:
case R_ARM_JUMP_SLOT:
*where = (Elf32_Addr)sym_val;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_ARM_JUMP_SLOT: 0x%x -> 0x%x 0x%x\n",
where, *where, sym_val));
break;
#if 0 /* To do */
case R_ARM_GOT_BREL:
temp = (Elf32_Addr)sym_val;
*where = (Elf32_Addr)&temp;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_ARM_GOT_BREL: 0x%x -> 0x%x 0x%x\n",
where, *where, sym_val));
break;
#endif
case R_ARM_RELATIVE:
*where = (Elf32_Addr)sym_val + *where;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("R_ARM_RELATIVE: 0x%x -> 0x%x 0x%x\n",
where, *where, sym_val));
break;
case R_ARM_THM_CALL:
case R_ARM_THM_JUMP24:
upper = *(rt_uint16_t *)where;
lower = *(rt_uint16_t *)((Elf32_Addr)where + 2);
sign = (upper >> 10) & 1;
j1 = (lower >> 13) & 1;
j2 = (lower >> 11) & 1;
offset = (sign << 24) |
((~(j1 ^ sign) & 1) << 23) |
((~(j2 ^ sign) & 1) << 22) |
((upper & 0x03ff) << 12) |
((lower & 0x07ff) << 1);
if (offset & 0x01000000)
offset -= 0x02000000;
offset += sym_val - (Elf32_Addr)where;
if (!(offset & 1) ||
offset <= (rt_int32_t)0xff000000 ||
offset >= (rt_int32_t)0x01000000)
{
rt_kprintf("Module: Only Thumb addresses allowed\n");
return -1;
}
sign = (offset >> 24) & 1;
j1 = sign ^ (~(offset >> 23) & 1);
j2 = sign ^ (~(offset >> 22) & 1);
*(rt_uint16_t *)where = (rt_uint16_t)((upper & 0xf800) |
(sign << 10) |
((offset >> 12) & 0x03ff));
*(rt_uint16_t *)(where + 2) = (rt_uint16_t)((lower & 0xd000) |
(j1 << 13) | (j2 << 11) |
((offset >> 1) & 0x07ff));
upper = *(rt_uint16_t *)where;
lower = *(rt_uint16_t *)((Elf32_Addr)where + 2);
break;
default:
return -1;
}
return 0;
}
void rt_module_init_object_container(struct rt_module *module)
{
RT_ASSERT(module != RT_NULL);
/* initialize object container - thread */
rt_list_init(&(module->module_object[RT_Object_Class_Thread].object_list));
module->module_object[RT_Object_Class_Thread].object_size = sizeof(struct rt_thread);
module->module_object[RT_Object_Class_Thread].type = RT_Object_Class_Thread;
#ifdef RT_USING_SEMAPHORE
/* initialize object container - semaphore */
rt_list_init(&(module->module_object[RT_Object_Class_Semaphore].object_list));
module->module_object[RT_Object_Class_Semaphore].object_size = sizeof(struct rt_semaphore);
module->module_object[RT_Object_Class_Semaphore].type = RT_Object_Class_Semaphore;
#endif
#ifdef RT_USING_MUTEX
/* initialize object container - mutex */
rt_list_init(&(module->module_object[RT_Object_Class_Mutex].object_list));
module->module_object[RT_Object_Class_Mutex].object_size = sizeof(struct rt_mutex);
module->module_object[RT_Object_Class_Mutex].type = RT_Object_Class_Mutex;
#endif
#ifdef RT_USING_EVENT
/* initialize object container - event */
rt_list_init(&(module->module_object[RT_Object_Class_Event].object_list));
module->module_object[RT_Object_Class_Event].object_size = sizeof(struct rt_event);
module->module_object[RT_Object_Class_Event].type = RT_Object_Class_Event;
#endif
#ifdef RT_USING_MAILBOX
/* initialize object container - mailbox */
rt_list_init(&(module->module_object[RT_Object_Class_MailBox].object_list));
module->module_object[RT_Object_Class_MailBox].object_size = sizeof(struct rt_mailbox);
module->module_object[RT_Object_Class_MailBox].type = RT_Object_Class_MailBox;
#endif
#ifdef RT_USING_MESSAGEQUEUE
/* initialize object container - message queue */
rt_list_init(&(module->module_object[RT_Object_Class_MessageQueue].object_list));
module->module_object[RT_Object_Class_MessageQueue].object_size = sizeof(struct rt_messagequeue);
module->module_object[RT_Object_Class_MessageQueue].type = RT_Object_Class_MessageQueue;
#endif
#ifdef RT_USING_MEMHEAP
/* initialize object container - memory heap */
rt_list_init(&(module->module_object[RT_Object_Class_MemHeap].object_list));
module->module_object[RT_Object_Class_MemHeap].object_size = sizeof(struct rt_memheap);
module->module_object[RT_Object_Class_MemHeap].type = RT_Object_Class_MemHeap;
#endif
#ifdef RT_USING_MEMPOOL
/* initialize object container - memory pool */
rt_list_init(&(module->module_object[RT_Object_Class_MemPool].object_list));
module->module_object[RT_Object_Class_MemPool].object_size = sizeof(struct rt_mempool);
module->module_object[RT_Object_Class_MemPool].type = RT_Object_Class_MemPool;
#endif
#ifdef RT_USING_DEVICE
/* initialize object container - device */
rt_list_init(&(module->module_object[RT_Object_Class_Device].object_list));
module->module_object[RT_Object_Class_Device].object_size = sizeof(struct rt_device);
module->module_object[RT_Object_Class_Device].type = RT_Object_Class_Device;
#endif
/* initialize object container - timer */
rt_list_init(&(module->module_object[RT_Object_Class_Timer].object_list));
module->module_object[RT_Object_Class_Timer].object_size = sizeof(struct rt_timer);
module->module_object[RT_Object_Class_Timer].type = RT_Object_Class_Timer;
}
#ifdef RT_USING_HOOK
static void (*rt_module_load_hook)(rt_module_t module);
static void (*rt_module_unload_hook)(rt_module_t module);
/**
* @addtogroup Hook
*/
/*@{*/
/**
* This function will set a hook function, which will be invoked when module
* be loaded to system.
*
* @param hook the hook function
*/
void rt_module_load_sethook(void (*hook)(rt_module_t module))
{
rt_module_load_hook = hook;
}
/**
* This function will set a hook function, which will be invoked when module
* be unloaded from system.
*
* @param hook the hook function
*/
void rt_module_unload_sethook(void (*hook)(rt_module_t module))
{
rt_module_unload_hook = hook;
}
/*@}*/
#endif
static struct rt_module *_load_shared_object(const char *name,
void *module_ptr)
{
rt_module_t module = RT_NULL;
rt_bool_t linked = RT_FALSE;
rt_uint32_t index, module_size = 0;
Elf32_Addr vstart_addr, vend_addr;
rt_bool_t has_vstart;
RT_ASSERT(module_ptr != RT_NULL);
if (rt_memcmp(elf_module->e_ident, RTMMAG, SELFMAG) == 0)
{
/* rtmlinker finished */
linked = RT_TRUE;
}
/* get the ELF image size */
has_vstart = RT_FALSE;
vstart_addr = vend_addr = RT_NULL;
for (index = 0; index < elf_module->e_phnum; index++)
{
if (phdr[index].p_type != PT_LOAD)
continue;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("LOAD segment: %d, 0x%p, 0x%08x\n",
index, phdr[index].p_vaddr, phdr[index].p_memsz));
if (phdr[index].p_memsz < phdr[index].p_filesz)
{
rt_kprintf("invalid elf: segment %d: p_memsz: %d, p_filesz: %d\n",
index, phdr[index].p_memsz, phdr[index].p_filesz);
return RT_NULL;
}
if (!has_vstart)
{
vstart_addr = phdr[index].p_vaddr;
vend_addr = phdr[index].p_vaddr + phdr[index].p_memsz;
has_vstart = RT_TRUE;
if (vend_addr < vstart_addr)
{
rt_kprintf("invalid elf: segment %d: p_vaddr: %d, p_memsz: %d\n",
index, phdr[index].p_vaddr, phdr[index].p_memsz);
return RT_NULL;
}
}
else
{
if (phdr[index].p_vaddr < vend_addr)
{
rt_kprintf("invalid elf: segment should be sorted and not overlapped\n");
return RT_NULL;
}
if (phdr[index].p_vaddr > vend_addr + 16)
{
/* There should not be too much padding in the object files. */
rt_kprintf("warning: too much padding before segment %d\n", index);
}
vend_addr = phdr[index].p_vaddr + phdr[index].p_memsz;
if (vend_addr < phdr[index].p_vaddr)
{
rt_kprintf("invalid elf: "
"segment %d address overflow\n", index);
return RT_NULL;
}
}
}
module_size = vend_addr - vstart_addr;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("module size: %d, vstart_addr: 0x%p\n",
module_size, vstart_addr));
if (module_size == 0)
{
rt_kprintf("Module: size error\n");
return RT_NULL;
}
/* allocate module */
module = (struct rt_module *)rt_object_allocate(RT_Object_Class_Module,
name);
if (!module)
return RT_NULL;
module->vstart_addr = vstart_addr;
module->nref = 0;
/* allocate module space */
module->module_space = rt_malloc(module_size);
if (module->module_space == RT_NULL)
{
rt_kprintf("Module: allocate space failed.\n");
rt_object_delete(&(module->parent));
return RT_NULL;
}
/* zero all space */
rt_memset(module->module_space, 0, module_size);
for (index = 0; index < elf_module->e_phnum; index++)
{
if (phdr[index].p_type == PT_LOAD)
{
rt_memcpy(module->module_space + phdr[index].p_vaddr - vstart_addr,
(rt_uint8_t *)elf_module + phdr[index].p_offset,
phdr[index].p_filesz);
}
}
/* set module entry */
module->module_entry = module->module_space
+ elf_module->e_entry - vstart_addr;
/* handle relocation section */
for (index = 0; index < elf_module->e_shnum; index ++)
{
rt_uint32_t i, nr_reloc;
Elf32_Sym *symtab;
Elf32_Rel *rel;
rt_uint8_t *strtab;
static rt_bool_t unsolved = RT_FALSE;
if (!IS_REL(shdr[index]))
continue;
/* get relocate item */
rel = (Elf32_Rel *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
/* locate .rel.plt and .rel.dyn section */
symtab = (Elf32_Sym *)((rt_uint8_t *)module_ptr +
shdr[shdr[index].sh_link].sh_offset);
strtab = (rt_uint8_t *)module_ptr +
shdr[shdr[shdr[index].sh_link].sh_link].sh_offset;
nr_reloc = (rt_uint32_t)(shdr[index].sh_size / sizeof(Elf32_Rel));
/* relocate every items */
for (i = 0; i < nr_reloc; i ++)
{
Elf32_Sym *sym = &symtab[ELF32_R_SYM(rel->r_info)];
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("relocate symbol %s shndx %d\n",
strtab + sym->st_name,
sym->st_shndx));
if ((sym->st_shndx != SHT_NULL) ||
(ELF_ST_BIND(sym->st_info) == STB_LOCAL))
{
rt_module_arm_relocate(module, rel,
(Elf32_Addr)(module->module_space
+ sym->st_value
- vstart_addr));
}
else if (!linked)
{
Elf32_Addr addr;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("relocate symbol: %s\n",
strtab + sym->st_name));
/* need to resolve symbol in kernel symbol table */
addr = rt_module_symbol_find((const char *)(strtab + sym->st_name));
if (addr == 0)
{
rt_kprintf("Module: can't find %s in kernel symbol table\n",
strtab + sym->st_name);
unsolved = RT_TRUE;
}
else
rt_module_arm_relocate(module, rel, addr);
}
rel ++;
}
if (unsolved)
{
rt_object_delete(&(module->parent));
return RT_NULL;
}
}
/* construct module symbol table */
for (index = 0; index < elf_module->e_shnum; index ++)
{
/* find .dynsym section */
rt_uint8_t *shstrab;
shstrab = (rt_uint8_t *)module_ptr +
shdr[elf_module->e_shstrndx].sh_offset;
if (rt_strcmp((const char *)(shstrab + shdr[index].sh_name), ELF_DYNSYM) == 0)
break;
}
/* found .dynsym section */
if (index != elf_module->e_shnum)
{
int i, count = 0;
Elf32_Sym *symtab = RT_NULL;
rt_uint8_t *strtab = RT_NULL;
symtab =(Elf32_Sym *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
strtab = (rt_uint8_t *)module_ptr + shdr[shdr[index].sh_link].sh_offset;
for (i = 0; i < shdr[index].sh_size/sizeof(Elf32_Sym); i++)
{
if ((ELF_ST_BIND(symtab[i].st_info) == STB_GLOBAL) &&
(ELF_ST_TYPE(symtab[i].st_info) == STT_FUNC))
count ++;
}
module->symtab = (struct rt_module_symtab *)rt_malloc
(count * sizeof(struct rt_module_symtab));
module->nsym = count;
for (i = 0, count = 0; i < shdr[index].sh_size/sizeof(Elf32_Sym); i++)
{
rt_size_t length;
if ((ELF_ST_BIND(symtab[i].st_info) != STB_GLOBAL) ||
(ELF_ST_TYPE(symtab[i].st_info) != STT_FUNC))
continue;
length = rt_strlen((const char *)(strtab + symtab[i].st_name)) + 1;
module->symtab[count].addr =
(void *)(module->module_space + symtab[i].st_value);
module->symtab[count].name = rt_malloc(length);
rt_memset((void *)module->symtab[count].name, 0, length);
rt_memcpy((void *)module->symtab[count].name,
strtab + symtab[i].st_name,
length);
count ++;
}
}
return module;
}
static struct rt_module* _load_relocated_object(const char *name,
void *module_ptr)
{
rt_uint32_t index, rodata_addr = 0, bss_addr = 0, data_addr = 0;
rt_uint32_t module_addr = 0, module_size = 0;
struct rt_module *module = RT_NULL;
rt_uint8_t *ptr, *strtab, *shstrab;
/* get the ELF image size */
for (index = 0; index < elf_module->e_shnum; index ++)
{
/* text */
if (IS_PROG(shdr[index]) && IS_AX(shdr[index]))
{
module_size += shdr[index].sh_size;
module_addr = shdr[index].sh_addr;
}
/* rodata */
if (IS_PROG(shdr[index]) && IS_ALLOC(shdr[index]))
{
module_size += shdr[index].sh_size;
}
/* data */
if (IS_PROG(shdr[index]) && IS_AW(shdr[index]))
{
module_size += shdr[index].sh_size;
}
/* bss */
if (IS_NOPROG(shdr[index]) && IS_AW(shdr[index]))
{
module_size += shdr[index].sh_size;
}
}
/* no text, data and bss on image */
if (module_size == 0)
return RT_NULL;
/* allocate module */
module = (struct rt_module *)
rt_object_allocate(RT_Object_Class_Module, (const char *)name);
if (module == RT_NULL)
return RT_NULL;
module->vstart_addr = 0;
/* allocate module space */
module->module_space = rt_malloc(module_size);
if (module->module_space == RT_NULL)
{
rt_kprintf("Module: allocate space failed.\n");
rt_object_delete(&(module->parent));
return RT_NULL;
}
/* zero all space */
ptr = module->module_space;
rt_memset(ptr, 0, module_size);
/* load text and data section */
for (index = 0; index < elf_module->e_shnum; index ++)
{
/* load text section */
if (IS_PROG(shdr[index]) && IS_AX(shdr[index]))
{
rt_memcpy(ptr,
(rt_uint8_t *)elf_module + shdr[index].sh_offset,
shdr[index].sh_size);
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("load text 0x%x, size %d\n",
ptr, shdr[index].sh_size));
ptr += shdr[index].sh_size;
}
/* load rodata section */
if (IS_PROG(shdr[index]) && IS_ALLOC(shdr[index]))
{
rt_memcpy(ptr,
(rt_uint8_t *)elf_module + shdr[index].sh_offset,
shdr[index].sh_size);
rodata_addr = (rt_uint32_t)ptr;
RT_DEBUG_LOG(RT_DEBUG_MODULE,
("load rodata 0x%x, size %d, rodata 0x%x\n",
ptr, shdr[index].sh_size, *(rt_uint32_t *)data_addr));
ptr += shdr[index].sh_size;
}
/* load data section */
if (IS_PROG(shdr[index]) && IS_AW(shdr[index]))
{
rt_memcpy(ptr,
(rt_uint8_t *)elf_module + shdr[index].sh_offset,
shdr[index].sh_size);
data_addr = (rt_uint32_t)ptr;
RT_DEBUG_LOG(RT_DEBUG_MODULE,
("load data 0x%x, size %d, data 0x%x\n",
ptr, shdr[index].sh_size, *(rt_uint32_t *)data_addr));
ptr += shdr[index].sh_size;
}
/* load bss section */
if (IS_NOPROG(shdr[index]) && IS_AW(shdr[index]))
{
rt_memset(ptr, 0, shdr[index].sh_size);
bss_addr = (rt_uint32_t)ptr;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("load bss 0x%x, size %d,\n",
ptr, shdr[index].sh_size));
}
}
/* set module entry */
module->module_entry =
(rt_uint8_t *)module->module_space + elf_module->e_entry - module_addr;
/* handle relocation section */
for (index = 0; index < elf_module->e_shnum; index ++)
{
rt_uint32_t i, nr_reloc;
Elf32_Sym *symtab;
Elf32_Rel *rel;
if (!IS_REL(shdr[index]))
continue;
/* get relocate item */
rel = (Elf32_Rel *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
/* locate .dynsym and .dynstr */
symtab = (Elf32_Sym *)((rt_uint8_t *)module_ptr +
shdr[shdr[index].sh_link].sh_offset);
strtab = (rt_uint8_t *)module_ptr +
shdr[shdr[shdr[index].sh_link].sh_link].sh_offset;
shstrab = (rt_uint8_t *)module_ptr +
shdr[elf_module->e_shstrndx].sh_offset;
nr_reloc = (rt_uint32_t)(shdr[index].sh_size / sizeof(Elf32_Rel));
/* relocate every items */
for (i = 0; i < nr_reloc; i ++)
{
Elf32_Sym *sym = &symtab[ELF32_R_SYM(rel->r_info)];
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("relocate symbol: %s\n",
strtab + sym->st_name));
if (sym->st_shndx != STN_UNDEF)
{
if ((ELF_ST_TYPE(sym->st_info) == STT_SECTION) ||
(ELF_ST_TYPE(sym->st_info) == STT_OBJECT))
{
if (rt_strncmp((const char *)(shstrab +
shdr[sym->st_shndx].sh_name), ELF_RODATA, 8) == 0)
{
/* relocate rodata section */
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("rodata\n"));
rt_module_arm_relocate(module, rel,
(Elf32_Addr)(rodata_addr + sym->st_value));
}
else if (rt_strncmp((const char*)
(shstrab + shdr[sym->st_shndx].sh_name), ELF_BSS, 5) == 0)
{
/* relocate bss section */
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("bss\n"));
rt_module_arm_relocate(module, rel,
(Elf32_Addr)bss_addr + sym->st_value);
}
else if (rt_strncmp((const char *)(shstrab + shdr[sym->st_shndx].sh_name),
ELF_DATA, 6) == 0)
{
/* relocate data section */
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("data\n"));
rt_module_arm_relocate(module, rel,
(Elf32_Addr)data_addr + sym->st_value);
}
}
}
else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC)
{
/* relocate function */
rt_module_arm_relocate(module, rel,
(Elf32_Addr)((rt_uint8_t *)
module->module_space
- module_addr
+ sym->st_value));
}
else
{
Elf32_Addr addr;
if (ELF32_R_TYPE(rel->r_info) != R_ARM_V4BX)
{
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("relocate symbol: %s\n",
strtab + sym->st_name));
/* need to resolve symbol in kernel symbol table */
addr = rt_module_symbol_find((const char *)(strtab + sym->st_name));
if (addr != (Elf32_Addr)RT_NULL)
{
rt_module_arm_relocate(module, rel, addr);
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("symbol addr 0x%x\n",
addr));
}
else
rt_kprintf("Module: can't find %s in kernel symbol table\n",
strtab + sym->st_name);
}
else
{
rt_module_arm_relocate(module, rel,
(Elf32_Addr)((rt_uint8_t*)
module->module_space
- module_addr
+ sym->st_value));
}
}
rel ++;
}
}
return module;
}
#define RT_MODULE_ARG_MAX 8
static int _rt_module_split_arg(char* cmd, rt_size_t length, char* argv[])
{
int argc = 0;
char *ptr = cmd;
while ((ptr - cmd) < length)
{
/* strip bank and tab */
while ((*ptr == ' ' || *ptr == '\t') && (ptr -cmd)< length)
*ptr++ = '\0';
/* check whether it's the end of line */
if ((ptr - cmd)>= length) break;
/* handle string with quote */
if (*ptr == '"')
{
argv[argc++] = ++ptr;
/* skip this string */
while (*ptr != '"' && (ptr-cmd) < length)
if (*ptr ++ == '\\') ptr ++;
if ((ptr - cmd) >= length) break;
/* skip '"' */
*ptr ++ = '\0';
}
else
{
argv[argc++] = ptr;
while ((*ptr != ' ' && *ptr != '\t') && (ptr - cmd) < length)
ptr ++;
}
if (argc >= RT_MODULE_ARG_MAX) break;
}
return argc;
}
/* module main thread entry */
static void module_main_entry(void* parameter)
{
int argc;
char *argv[RT_MODULE_ARG_MAX];
typedef int (*main_func_t)(int argc, char** argv);
rt_module_t module = (rt_module_t) parameter;
if (module == RT_NULL)
return;
if (module->module_cmd_line == RT_NULL && module->module_cmd_size != 0)
/* malloc for module_cmd_line failed. */
return;
/* FIXME: we should run some C++ initialize code before jump into the
* entry. */
if (module->module_cmd_line == RT_NULL)
{
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("run bare entry: 0x%p\n",
module->module_entry));
((main_func_t)module->module_entry)(0, RT_NULL);
return;
}
rt_memset(argv, 0x00, sizeof(argv));
argc = _rt_module_split_arg((char*)module->module_cmd_line,
module->module_cmd_size, argv);
if (argc == 0)
return;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("run main entry: 0x%p with %s\n",
module->module_entry,
module->module_cmd_line));
/* do the main function */
((main_func_t)module->module_entry)(argc, argv);
return;
}
/**
* This function will load a module with a main function from memory and create a
* main thread for it
*
* @param name the name of module, which shall be unique
* @param module_ptr the memory address of module image
* @argc the count of argument
* @argd the argument data, which should be a
*
* @return the module object
*/
rt_module_t rt_module_do_main(const char *name,
void *module_ptr,
const char* cmd_line,
int line_size)
{
rt_module_t module;
RT_DEBUG_NOT_IN_INTERRUPT;
RT_DEBUG_LOG(RT_DEBUG_MODULE, ("rt_module_load: %s\n", name));
/* check ELF header */
if (rt_memcmp(elf_module->e_ident, RTMMAG, SELFMAG) != 0 &&
rt_memcmp(elf_module->e_ident, ELFMAG, SELFMAG) != 0)
{
rt_kprintf("Module: magic error\n");
return RT_NULL;
}
/* check ELF class */
if (elf_module->e_ident[EI_CLASS] != ELFCLASS32)
{
rt_kprintf("Module: ELF class error\n");
return RT_NULL;
}
if (elf_module->e_type == ET_REL)
{
module = _load_relocated_object(name, module_ptr);
}
else if (elf_module->e_type == ET_DYN)
{
module = _load_shared_object(name, module_ptr);
}
else
{
rt_kprintf("Module: unsupported elf type\n");
return RT_NULL;
}
if (module == RT_NULL)
return RT_NULL;
/* init module object container */
rt_module_init_object_container(module);
if (line_size && cmd_line)
{
/* set module argument */