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Add support for the loading of ET_DYN objects

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* libs/libc/machine/arm/armv7-m/arch_elf.c
      - Fix cast of error message parameters

    * build-globals.sh
      - Build the modlib_globals.S file used to resolve symbols when dynamically loading

    * libs/libc/modlib/Make.defs
      - Build modlib_globals.S for all targets

    * libs/libc/modlib/modlib_load.c
      - Calculate sizes and text/data addresses based on program headers rather than section headers
      - Handle objects with no program headers

    * libs/libc/modlib/modlib_bind.c
      - Call modlib_readsym with pointer to symbol table
      - Add modlib_relocatedyn to manage relocation of symbols with shared object (ET_DYN)
      - Differentiate between ET_REL and ET_DYN objects
      - Use arch independent symbol ELF_R_SYM
      - Cast sizes to avoid warnings

    * libs/libc/modlib/modlib_load.c
      - Cast sizes to avoid warnings

    * include/elf.h
      - Add definitions that may be found in shared objects

    * include/nuttx/lib/modlib.h
      - Add parameter to modlib_readsym prototype
      - Add prototypes for:
        - modlib_insertsymtab
        - modlib_findglobal
      - Define Elf_Dyn and Elf_Off according to the elf architecture
      - Add fields to mod_loadifno_s:
        - Program headers
        - Exported symbols
        - Data section address
        - Padding requirement
        - Section index for dynamic symbol table
        - Number of symbols exported
      - Add prottotype for modlib_freesymtab

    * libs/libc/dlfcn/lib_dlclose.c
      - Free the symbol table when the dll is closed

    * libs/libc/dlfcn/lib_dlopen.c
      - Add dump of program headers to debug routine
      - Differentiate between ET_REL and ET_DYN objects

    * libs/libc/machine/arm/armv7-m/arch_elf.c
      - Add handling of R_ARM_RELATIVE and R_ARM_JUMP slot relocation types

    * libs/libc/modlib/modlib_loadshdrs.c
      - Rename modlib_loadshdrs.c to modlib_loadhdrs.c
      - Rename modlib_loadshdrs to modlib_loadhdrs
      - Add code to load program headers

    * libs/libc/modlib/modlib_symbols.c
      - Define entry point structure
      - Add offset parameter to modlib_symname() and use to find symbol names
      - Add symtab section header parameter to modlib_readsym()
      - Add offset parameter to modlib_symvalue() to locate symbol names
      - Add modlib_insertsyntab() to create a symbol table for exporting and resolution
      - Add findEP() to resolve a symbol in the modlib_global table
      - Add modlib_findglobal() to find symbol in the modlib_global table
      - Add modlib_freesymtab() to free the symbol table

    * libs/libc/modlib/modlib_uninit.c
      - Free header and sections from a module_loadinfo_s control block

    * libs/libc/modlib/modlib_verify.c
      - Handle ET_DYN shared objects

    * libs/libc/modlib/modlib_globals.S
      - Multi-target global table
      - Define library APIs that may be resolved when loading a shared object
This commit is contained in:
Neale Ferguson
2022-09-26 16:22:03 +10:00
committed by Alan Carvalho de Assis
parent f0107683d5
commit fec789047a
18 changed files with 4918 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libs/libc/machine/arm/armv7-m/arch_elf.c
+11 -1
View File
@@ -122,7 +122,8 @@ int up_relocate(const Elf32_Rel *rel, const Elf32_Sym *sym, uintptr_t addr)
*/
relotype = ELF32_R_TYPE(rel->r_info);
if (sym == NULL && relotype != R_ARM_NONE && relotype != R_ARM_V4BX)
if (sym == NULL && relotype != R_ARM_NONE && relotype != R_ARM_V4BX &&
relotype != R_ARM_RELATIVE && relotype != R_ARM_JUMP_SLOT)
{
return -EINVAL;
}
@@ -492,6 +493,15 @@ int up_relocate(const Elf32_Rel *rel, const Elf32_Sym *sym, uintptr_t addr)
}
break;
case R_ARM_RELATIVE :
case R_ARM_JUMP_SLOT :
{
binfo("Relocating: RELATIVE/JUMP_SLOT at %p value: %08lx with %08lx\n",
(void *)addr,*(unsigned log *) addr, (unsigned long) sym->st_value);
*(uint32_t *) addr = (uint32_t) sym->st_value;
}
break;
default:
berr("ERROR: Unsupported relocation: %" PRId32 "\n",
ELF32_R_TYPE(rel->r_info));