config_fb_vesa不设置，不能启动radeon模块的原因分析

来源：互联网发布：linq for java 编辑：程序博客网时间：2024/05/22 03:04

/* Allocate and load the module: note that size of section 0 is always
   zero, and we rely on this for optional sections. */
static int load_module(struct load_info *info, const char __user *uargs,
               int flags)
{
   struct module *mod;
   long err;
   char *after_dashes;

   err = module_sig_check(info);
   if (err)
       goto free_copy;

   err = elf_header_check(info);
   if (err)
       goto free_copy;

   /* Figure out module layout, and allocate all the memory. */
   mod = layout_and_allocate(info, flags);
   if (IS_ERR(mod)) {
       err = PTR_ERR(mod);
       goto free_copy;
   }

   /* Reserve our place in the list. */
   err = add_unformed_module(mod);
   if (err)
       goto free_module;

#ifdef CONFIG_MODULE_SIG
   mod->sig_ok = info->sig_ok;
   if (!mod->sig_ok) {
       pr_notice_once("%s: module verification failed: signature "
                   "and/or required key missing - tainting "
                   "kernel\n", mod->name);
       add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
   }
#endif

   /* To avoid stressing percpu allocator, do this once we're unique. */
   err = percpu_modalloc(mod, info);
   if (err)
       goto unlink_mod;

   /* Now module is in final location, initialize linked lists, etc. */
   err = module_unload_init(mod);
   if (err)
       goto unlink_mod;

   /* Now we've got everything in the final locations, we can
   * find optional sections. */
   err = find_module_sections(mod, info);
   if (err)
       goto free_unload;

   err = check_module_license_and_versions(mod);
   if (err)
       goto free_unload;

   /* Set up MODINFO_ATTR fields */
   setup_modinfo(mod, info);

   /* Fix up syms, so that st_value is a pointer to location. */
   err = simplify_symbols(mod, info);
   if (err < 0)
       goto free_modinfo;

/* Change all symbols so that st_value encodes the pointer directly. */
static int simplify_symbols(struct module *mod, const struct load_info *info)
{
   Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
   Elf_Sym *sym = (void *)symsec->sh_addr;
   unsigned long secbase;
   unsigned int i;
   int ret = 0;
   const struct kernel_symbol *ksym;

   for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
       const char *name = info->strtab + sym[i].st_name;

       switch (sym[i].st_shndx) {
       case SHN_COMMON:
           /* Ignore common symbols */
           if (!strncmp(name, "__gnu_lto", 9))
               break;

           /* We compiled with -fno-common. These are not
               supposed to happen. */
           pr_debug("Common symbol: %s\n", name);
           printk("%s: please compile with -fno-common\n",
                   mod->name);
           ret = -ENOEXEC;
           break;

       case SHN_ABS:
           /* Don't need to do anything */
           pr_debug("Absolute symbol: 0x%08lx\n",
                   (long)sym[i].st_value);
           break;

       case SHN_UNDEF:
           ksym = resolve_symbol_wait(mod, info, name);
           /* Ok if resolved. */
           if (ksym && !IS_ERR(ksym)) {
               sym[i].st_value = ksym->value;
               break;
           }

           /* Ok if weak. */
           if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
               break;

           pr_warn("%s: Unknown symbol %s (err %li)\n",
               mod->name, name, PTR_ERR(ksym));
           ret = PTR_ERR(ksym) ?: -ENOENT;
           break;

       default:
           /* Divert to percpu allocation if a percpu var. */
           if (sym[i].st_shndx == info->index.pcpu)
               secbase = (unsigned long)mod_percpu(mod);
           else
               secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
           sym[i].st_value += secbase;
           break;
       }
   }

   return ret;
}

pr_warn("%s: Unknown symbol %s (err %li)\n",
                mod->name, name, PTR_ERR(ksym));

grep -rn "Unknown symbol" ./*
./arch/arm/kernel/unwind.c:160:        pr_warn("unwind: Unknown symbol address %08lx\n", addr);
./arch/mips/kernel/module.c:221:            printk(KERN_WARNING "%s: Unknown symbol %s\n",
./arch/mips/kernel/module-rela.c:132:            printk(KERN_WARNING "%s: Unknown symbol %s\n",
./arch/parisc/kernel/module.c:572:            printk(KERN_WARNING "%s: Unknown symbol %s\n",
./arch/parisc/kernel/module.c:708:            printk(KERN_WARNING "%s: Unknown symbol %s\n",
匹配到二进制文件 ./arch/x86/boot/compressed/vmlinux.bin
./kernel/module.c:1981:            pr_warn("%s: Unknown symbol %s (err %li)\n",
匹配到二进制文件 ./kernel/module.o
匹配到二进制文件 ./kernel/built-in.o
./scripts/kconfig/symbol.c:868: * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
匹配到二进制文件 ./vmlinux
匹配到二进制文件 ./vmlinux.o

[   21.511318] radeon: Unknown symbol cfb_copyarea (err 0)
[   21.522742] radeon: Unknown symbol cfb_imageblit (err 0)
[   21.522941] radeon: Unknown symbol cfb_fillrect (err 0)

objdump -t vesafb.o >vesafbot.txt

vesafb.o：     文件格式 elf32-i386

SYMBOL TABLE:
00000000 l    df *ABS*   00000000 vesafb.c
00000000 l    d .text   00000000 .text
00000000 l    d .data   00000000 .data
00000000 l    d .bss   00000000 .bss
00000000 l     F .text   0000003a vesafb_pan_display
0000000c l     O .data..read_mostly   00000004 pmi_start
00000000 l    d .init.text   00000000 .init.text
00000000 l     F .init.text   00000011 vesafb_driver_init
00000000 l     O .data   00000058 vesafb_driver
00000040 l     F .text   0000001a vesafb_remove
00000060 l     F .text   00000039 vesafb_destroy
00000000 l    d .exit.text   00000000 .exit.text
00000000 l     F .exit.text   0000000f vesafb_driver_exit
000000a0 l     F .text   000001b1 vesafb_setcolreg
00000000 l     O .data..read_mostly   00000004 vga_compat
00000004 l     O .data..read_mostly   00000004 depth
00000014 l     O .data..read_mostly   00000004 pmi_setpal
00000008 l     O .data..read_mostly   00000004 pmi_pal
00000000 l    d .rodata.str1.1   00000000 .rodata.str1.1
00000000 l    d .rodata.str1.4   00000000 .rodata.str1.4
00000260 l     F .text   00000952 vesafb_probe
0000001c l     O .data..read_mostly   00000004 inverse
000000c0 l     O .data   00000044 vesafb_fix
00000120 l     O .data   000000a0 vesafb_defined
00000000 l     O .bss   00000004 vram_total
00000004 l     O .bss   00000004 vram_remap
00000010 l     O .data..read_mostly   00000004 ypan
00000018 l     O .data..read_mostly   00000004 mtrr
00000060 l     O .data   00000060 vesafb_ops
00000000 l     O .rodata   0000000c CSWTCH.197
00000000 l    d .rodata   00000000 .rodata
00000000 l    d .exitcall.exit   00000000 .exitcall.exit
00000000 l     O .exitcall.exit   00000004 __exitcall_vesafb_driver_exit
00000000 l    d .initcall6.init   00000000 .initcall6.init
00000000 l     O .initcall6.init   00000004 __initcall_vesafb_driver_init6
00000000 l    d .data..read_mostly   00000000 .data..read_mostly
00000000 l    d .note.GNU-stack   00000000 .note.GNU-stack
00000000 l    d .comment   00000000 .comment
00000000         *UND*   00000000 __platform_driver_register
00000000         *UND*   00000000 unregister_framebuffer
00000000         *UND*   00000000 framebuffer_release
00000000         *UND*   00000000 fb_dealloc_cmap
00000000         *UND*   00000000 iounmap
00000000         *UND*   00000000 iomem_resource
00000000         *UND*   00000000 __release_region
00000000         *UND*   00000000 platform_driver_unregister
00000000         *UND*   00000000 native_io_delay
00000000         *UND*   00000000 fb_get_options
00000000         *UND*   00000000 strsep
00000000         *UND*   00000000 strcmp
00000000         *UND*   00000000 screen_info
00000000         *UND*   00000000 __request_region
00000000         *UND*   00000000 framebuffer_alloc
00000000         *UND*   00000000 kmalloc_caches
00000000         *UND*   00000000 kmem_cache_alloc
00000000         *UND*   00000000 printk
00000000         *UND*   00000000 ioport_resource
00000000         *UND*   00000000 ioremap_wc
00000000         *UND*   00000000 fb_alloc_cmap
00000000         *UND*   00000000 register_framebuffer
00000000         *UND*   00000000 strncmp
00000000         *UND*   00000000 simple_strtoul
00000000         *UND*   00000000 ioremap_cache
00000000         *UND*   00000000 mtrr_add
00000000         *UND*   00000000 ioremap_nocache
00000000         *UND*   00000000 cfb_fillrect
00000000         *UND*   00000000 cfb_copyarea
00000000         *UND*   00000000 cfb_imageblit

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