444 lines
15 KiB
C
444 lines
15 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018/08/29 Bernard first version
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*/
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#include "dlmodule.h"
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#include "dlelf.h"
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#define DBG_SECTION_NAME "DLMD"
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#define DBG_ENABLE // enable debug macro
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#define DBG_LEVEL DBG_INFO
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#define DBG_COLOR
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#include <rtdbg.h> // must after of DEBUG_ENABLE or some other options
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rt_err_t dlmodule_load_shared_object(struct rt_dlmodule* module, void *module_ptr)
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{
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rt_bool_t linked = RT_FALSE;
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rt_uint32_t index, module_size = 0;
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Elf32_Addr vstart_addr, vend_addr;
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rt_bool_t has_vstart;
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RT_ASSERT(module_ptr != RT_NULL);
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if (rt_memcmp(elf_module->e_ident, RTMMAG, SELFMAG) == 0)
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{
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/* rtmlinker finished */
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linked = RT_TRUE;
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}
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/* get the ELF image size */
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has_vstart = RT_FALSE;
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vstart_addr = vend_addr = RT_NULL;
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for (index = 0; index < elf_module->e_phnum; index++)
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{
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if (phdr[index].p_type != PT_LOAD)
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continue;
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LOG_D("LOAD segment: %d, 0x%p, 0x%08x", index, phdr[index].p_vaddr, phdr[index].p_memsz);
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if (phdr[index].p_memsz < phdr[index].p_filesz)
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{
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rt_kprintf("invalid elf: segment %d: p_memsz: %d, p_filesz: %d\n",
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index, phdr[index].p_memsz, phdr[index].p_filesz);
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return RT_NULL;
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}
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if (!has_vstart)
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{
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vstart_addr = phdr[index].p_vaddr;
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vend_addr = phdr[index].p_vaddr + phdr[index].p_memsz;
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has_vstart = RT_TRUE;
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if (vend_addr < vstart_addr)
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{
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rt_kprintf("invalid elf: segment %d: p_vaddr: %d, p_memsz: %d\n",
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index, phdr[index].p_vaddr, phdr[index].p_memsz);
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return RT_NULL;
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}
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}
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else
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{
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if (phdr[index].p_vaddr < vend_addr)
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{
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rt_kprintf("invalid elf: segment should be sorted and not overlapped\n");
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return RT_NULL;
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}
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if (phdr[index].p_vaddr > vend_addr + 16)
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{
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/* There should not be too much padding in the object files. */
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LOG_W("warning: too much padding before segment %d", index);
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}
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vend_addr = phdr[index].p_vaddr + phdr[index].p_memsz;
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if (vend_addr < phdr[index].p_vaddr)
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{
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rt_kprintf("invalid elf: "
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"segment %d address overflow\n", index);
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return RT_NULL;
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}
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}
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}
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module_size = vend_addr - vstart_addr;
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LOG_D("module size: %d, vstart_addr: 0x%p", module_size, vstart_addr);
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if (module_size == 0)
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{
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rt_kprintf("Module: size error\n");
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return -RT_ERROR;
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}
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module->vstart_addr = vstart_addr;
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module->nref = 0;
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/* allocate module space */
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module->mem_space = rt_malloc(module_size);
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if (module->mem_space == RT_NULL)
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{
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rt_kprintf("Module: allocate space failed.\n");
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return -RT_ERROR;
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}
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module->mem_size = module_size;
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/* zero all space */
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rt_memset(module->mem_space, 0, module_size);
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for (index = 0; index < elf_module->e_phnum; index++)
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{
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if (phdr[index].p_type == PT_LOAD)
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{
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rt_memcpy(module->mem_space + phdr[index].p_vaddr - vstart_addr,
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(rt_uint8_t *)elf_module + phdr[index].p_offset,
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phdr[index].p_filesz);
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}
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}
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/* set module entry */
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module->entry_addr = module->mem_space + elf_module->e_entry - vstart_addr;
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/* handle relocation section */
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for (index = 0; index < elf_module->e_shnum; index ++)
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{
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rt_uint32_t i, nr_reloc;
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Elf32_Sym *symtab;
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Elf32_Rel *rel;
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rt_uint8_t *strtab;
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static rt_bool_t unsolved = RT_FALSE;
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if (!IS_REL(shdr[index]))
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continue;
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/* get relocate item */
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rel = (Elf32_Rel *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
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/* locate .rel.plt and .rel.dyn section */
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symtab = (Elf32_Sym *)((rt_uint8_t *)module_ptr +
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shdr[shdr[index].sh_link].sh_offset);
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strtab = (rt_uint8_t *)module_ptr +
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shdr[shdr[shdr[index].sh_link].sh_link].sh_offset;
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nr_reloc = (rt_uint32_t)(shdr[index].sh_size / sizeof(Elf32_Rel));
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/* relocate every items */
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for (i = 0; i < nr_reloc; i ++)
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{
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Elf32_Sym *sym = &symtab[ELF32_R_SYM(rel->r_info)];
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LOG_D("relocate symbol %s shndx %d", strtab + sym->st_name, sym->st_shndx);
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if ((sym->st_shndx != SHT_NULL) ||(ELF_ST_BIND(sym->st_info) == STB_LOCAL))
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{
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Elf32_Addr addr;
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addr = (Elf32_Addr)(module->mem_space + sym->st_value - vstart_addr);
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dlmodule_relocate(module, rel, addr);
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}
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else if (!linked)
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{
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Elf32_Addr addr;
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LOG_D("relocate symbol: %s", strtab + sym->st_name);
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/* need to resolve symbol in kernel symbol table */
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addr = dlmodule_symbol_find((const char *)(strtab + sym->st_name));
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if (addr == 0)
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{
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LOG_E("Module: can't find %s in kernel symbol table", strtab + sym->st_name);
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unsolved = RT_TRUE;
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}
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else
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{
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dlmodule_relocate(module, rel, addr);
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}
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}
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rel ++;
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}
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if (unsolved)
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return -RT_ERROR;
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}
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/* construct module symbol table */
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for (index = 0; index < elf_module->e_shnum; index ++)
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{
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/* find .dynsym section */
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rt_uint8_t *shstrab;
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shstrab = (rt_uint8_t *)module_ptr +
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shdr[elf_module->e_shstrndx].sh_offset;
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if (rt_strcmp((const char *)(shstrab + shdr[index].sh_name), ELF_DYNSYM) == 0)
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break;
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}
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/* found .dynsym section */
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if (index != elf_module->e_shnum)
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{
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int i, count = 0;
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Elf32_Sym *symtab = RT_NULL;
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rt_uint8_t *strtab = RT_NULL;
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symtab = (Elf32_Sym *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
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strtab = (rt_uint8_t *)module_ptr + shdr[shdr[index].sh_link].sh_offset;
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for (i = 0; i < shdr[index].sh_size / sizeof(Elf32_Sym); i++)
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{
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if ((ELF_ST_BIND(symtab[i].st_info) == STB_GLOBAL) &&
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(ELF_ST_TYPE(symtab[i].st_info) == STT_FUNC))
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count ++;
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}
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module->symtab = (struct rt_module_symtab *)rt_malloc
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(count * sizeof(struct rt_module_symtab));
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module->nsym = count;
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for (i = 0, count = 0; i < shdr[index].sh_size / sizeof(Elf32_Sym); i++)
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{
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rt_size_t length;
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if ((ELF_ST_BIND(symtab[i].st_info) != STB_GLOBAL) ||
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(ELF_ST_TYPE(symtab[i].st_info) != STT_FUNC))
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continue;
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length = rt_strlen((const char *)(strtab + symtab[i].st_name)) + 1;
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module->symtab[count].addr =
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(void *)(module->mem_space + symtab[i].st_value - module->vstart_addr);
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module->symtab[count].name = rt_malloc(length);
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rt_memset((void *)module->symtab[count].name, 0, length);
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rt_memcpy((void *)module->symtab[count].name,
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strtab + symtab[i].st_name,
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length);
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count ++;
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}
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}
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return RT_EOK;
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}
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rt_err_t dlmodule_load_relocated_object(struct rt_dlmodule* module, void *module_ptr)
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{
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rt_uint32_t index, rodata_addr = 0, bss_addr = 0, data_addr = 0;
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rt_uint32_t module_addr = 0, module_size = 0;
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rt_uint8_t *ptr, *strtab, *shstrab;
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/* get the ELF image size */
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for (index = 0; index < elf_module->e_shnum; index ++)
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{
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/* text */
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if (IS_PROG(shdr[index]) && IS_AX(shdr[index]))
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{
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module_size += shdr[index].sh_size;
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module_addr = shdr[index].sh_addr;
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}
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/* rodata */
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if (IS_PROG(shdr[index]) && IS_ALLOC(shdr[index]))
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{
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module_size += shdr[index].sh_size;
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}
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/* data */
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if (IS_PROG(shdr[index]) && IS_AW(shdr[index]))
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{
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module_size += shdr[index].sh_size;
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}
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/* bss */
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if (IS_NOPROG(shdr[index]) && IS_AW(shdr[index]))
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{
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module_size += shdr[index].sh_size;
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}
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}
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/* no text, data and bss on image */
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if (module_size == 0) return RT_NULL;
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module->vstart_addr = 0;
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/* allocate module space */
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module->mem_space = rt_malloc(module_size);
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if (module->mem_space == RT_NULL)
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{
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rt_kprintf("Module: allocate space failed.\n");
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return -RT_ERROR;
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}
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module->mem_size = module_size;
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/* zero all space */
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ptr = module->mem_space;
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rt_memset(ptr, 0, module_size);
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/* load text and data section */
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for (index = 0; index < elf_module->e_shnum; index ++)
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{
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/* load text section */
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if (IS_PROG(shdr[index]) && IS_AX(shdr[index]))
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{
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rt_memcpy(ptr,
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(rt_uint8_t *)elf_module + shdr[index].sh_offset,
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shdr[index].sh_size);
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LOG_D("load text 0x%x, size %d", ptr, shdr[index].sh_size);
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ptr += shdr[index].sh_size;
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}
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/* load rodata section */
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if (IS_PROG(shdr[index]) && IS_ALLOC(shdr[index]))
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{
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rt_memcpy(ptr,
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(rt_uint8_t *)elf_module + shdr[index].sh_offset,
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shdr[index].sh_size);
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rodata_addr = (rt_uint32_t)ptr;
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LOG_D("load rodata 0x%x, size %d, rodata 0x%x", ptr,
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shdr[index].sh_size, *(rt_uint32_t *)data_addr);
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ptr += shdr[index].sh_size;
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}
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/* load data section */
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if (IS_PROG(shdr[index]) && IS_AW(shdr[index]))
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{
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rt_memcpy(ptr,
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(rt_uint8_t *)elf_module + shdr[index].sh_offset,
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shdr[index].sh_size);
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data_addr = (rt_uint32_t)ptr;
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LOG_D("load data 0x%x, size %d, data 0x%x", ptr,
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shdr[index].sh_size, *(rt_uint32_t *)data_addr);
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ptr += shdr[index].sh_size;
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}
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/* load bss section */
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if (IS_NOPROG(shdr[index]) && IS_AW(shdr[index]))
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{
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rt_memset(ptr, 0, shdr[index].sh_size);
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bss_addr = (rt_uint32_t)ptr;
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LOG_D("load bss 0x%x, size %d", ptr, shdr[index].sh_size);
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}
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}
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/* set module entry */
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module->entry_addr = (rt_dlmodule_entry_func_t)((rt_uint8_t *)module->mem_space + elf_module->e_entry - module_addr);
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/* handle relocation section */
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for (index = 0; index < elf_module->e_shnum; index ++)
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{
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rt_uint32_t i, nr_reloc;
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Elf32_Sym *symtab;
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Elf32_Rel *rel;
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if (!IS_REL(shdr[index]))
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continue;
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/* get relocate item */
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rel = (Elf32_Rel *)((rt_uint8_t *)module_ptr + shdr[index].sh_offset);
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/* locate .dynsym and .dynstr */
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symtab = (Elf32_Sym *)((rt_uint8_t *)module_ptr +
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shdr[shdr[index].sh_link].sh_offset);
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strtab = (rt_uint8_t *)module_ptr +
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shdr[shdr[shdr[index].sh_link].sh_link].sh_offset;
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shstrab = (rt_uint8_t *)module_ptr +
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shdr[elf_module->e_shstrndx].sh_offset;
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nr_reloc = (rt_uint32_t)(shdr[index].sh_size / sizeof(Elf32_Rel));
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/* relocate every items */
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for (i = 0; i < nr_reloc; i ++)
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{
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Elf32_Sym *sym = &symtab[ELF32_R_SYM(rel->r_info)];
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LOG_D("relocate symbol: %s", strtab + sym->st_name);
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if (sym->st_shndx != STN_UNDEF)
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{
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Elf32_Addr addr = 0;
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if ((ELF_ST_TYPE(sym->st_info) == STT_SECTION) ||
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(ELF_ST_TYPE(sym->st_info) == STT_OBJECT))
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{
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if (rt_strncmp((const char *)(shstrab +
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shdr[sym->st_shndx].sh_name), ELF_RODATA, 8) == 0)
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{
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/* relocate rodata section */
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LOG_D("rodata");
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addr = (Elf32_Addr)(rodata_addr + sym->st_value);
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}
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else if (rt_strncmp((const char *)
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(shstrab + shdr[sym->st_shndx].sh_name), ELF_BSS, 5) == 0)
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{
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/* relocate bss section */
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LOG_D("bss");
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addr = (Elf32_Addr)bss_addr + sym->st_value;
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}
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else if (rt_strncmp((const char *)(shstrab + shdr[sym->st_shndx].sh_name),
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ELF_DATA, 6) == 0)
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{
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/* relocate data section */
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LOG_D("data");
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addr = (Elf32_Addr)data_addr + sym->st_value;
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}
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if (addr != 0) dlmodule_relocate(module, rel, addr);
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}
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else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC)
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{
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addr = (Elf32_Addr)((rt_uint8_t *) module->mem_space - module_addr + sym->st_value);
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/* relocate function */
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dlmodule_relocate(module, rel, addr);
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}
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}
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else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC)
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{
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/* relocate function */
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dlmodule_relocate(module, rel,
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(Elf32_Addr)((rt_uint8_t *)
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module->mem_space
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- module_addr
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+ sym->st_value));
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}
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else
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{
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Elf32_Addr addr;
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if (ELF32_R_TYPE(rel->r_info) != R_ARM_V4BX)
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{
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LOG_D("relocate symbol: %s", strtab + sym->st_name);
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/* need to resolve symbol in kernel symbol table */
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addr = dlmodule_symbol_find((const char *)(strtab + sym->st_name));
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if (addr != (Elf32_Addr)RT_NULL)
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{
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dlmodule_relocate(module, rel, addr);
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LOG_D("symbol addr 0x%x", addr);
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}
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else
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LOG_E("Module: can't find %s in kernel symbol table",
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strtab + sym->st_name);
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}
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else
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{
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addr = (Elf32_Addr)((rt_uint8_t *) module->mem_space - module_addr + sym->st_value);
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dlmodule_relocate(module, rel, addr);
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}
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}
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rel ++;
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}
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}
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return RT_EOK;
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}
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