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- /*
- * Architecture specific code used by dl-startup.c
- *
- * Copyright (C) 2005-2007 Atmel Corporation
- *
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
- /* This is the library loader's main entry point. Let _dl_boot2 do its
- * initializations and jump to the application's entry point
- * afterwards. */
- __asm__(" .text\n"
- " .global _start\n"
- " .type _start,@function\n"
- " .hidden _start\n"
- "_start:\n"
- /* All arguments are on the stack initially */
- " mov r12, sp\n"
- " rcall _dl_start\n"
- /* Returns user entry point in r12. Save it. */
- " mov r0, r12\n"
- /* We're PIC, so get the Global Offset Table */
- " lddpc r6, .L_GOT\n"
- ".L_RGOT:\n"
- " rsub r6, pc\n"
- /* Adjust argc and argv according to _dl_skip_args */
- " ld.w r1, r6[_dl_skip_args@got]\n"
- " ld.w r1, r1[0]\n"
- " ld.w r2, sp++\n"
- " sub r2, r1\n"
- " add sp, sp, r1 << 2\n"
- " st.w --sp, r2\n"
- /* Load the finalizer function */
- " ld.w r12, r6[_dl_fini@got]\n"
- /* Jump to the user's entry point */
- " mov pc, r0\n\n"
- " .align 2\n"
- ".L_GOT:"
- " .long .L_RGOT - _GLOBAL_OFFSET_TABLE_\n"
- " .size _start, . - _start\n"
- " .previous\n");
- /* Get a pointer to the argv array. On many platforms this can be just
- * the address of the first argument, on other platforms we need to
- * do something a little more subtle here. */
- #define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long *)ARGS + 1)
- /* We can't call functions before the GOT has been initialized */
- #define NO_FUNCS_BEFORE_BOOTSTRAP
- /*
- * Relocate the GOT during dynamic loader bootstrap. This will add
- * the load address to all entries in the GOT, which is necessary
- * because the linker doesn't generate R_AVR32_RELATIVE relocs for the
- * GOT.
- */
- static __always_inline
- void PERFORM_BOOTSTRAP_GOT(struct elf_resolve *tpnt)
- {
- Elf32_Addr i, nr_got;
- register Elf32_Addr *__r6 __asm__("r6");
- Elf32_Addr *got = __r6;
- nr_got = tpnt->dynamic_info[DT_AVR32_GOTSZ_IDX] / sizeof(*got);
- for (i = 2; i < nr_got; i++)
- got[i] += tpnt->loadaddr;
- }
- #define PERFORM_BOOTSTRAP_GOT(tpnt) PERFORM_BOOTSTRAP_GOT(tpnt)
- /* Handle relocation of the symbols in the dynamic loader. */
- static __always_inline
- void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
- unsigned long symbol_addr,
- unsigned long load_addr, Elf32_Sym *symtab)
- {
- switch(ELF_R_TYPE(rpnt->r_info)) {
- case R_AVR32_NONE:
- break;
- case R_AVR32_GLOB_DAT:
- case R_AVR32_JMP_SLOT:
- *reloc_addr = symbol_addr;
- break;
- case R_AVR32_RELATIVE:
- SEND_STDERR_DEBUG("Applying RELATIVE relocation: ");
- SEND_ADDRESS_STDERR_DEBUG(load_addr, 0);
- SEND_STDERR_DEBUG(" + ");
- SEND_ADDRESS_STDERR_DEBUG(rpnt->r_addend, 1);
- *reloc_addr = load_addr + rpnt->r_addend;
- break;
- default:
- SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc_type ");
- SEND_NUMBER_STDERR(ELF_R_TYPE(rpnt->r_info), 1);
- SEND_STDERR("REL, SYMBOL, LOAD: ");
- SEND_ADDRESS_STDERR(reloc_addr, 0);
- SEND_STDERR(", ");
- SEND_ADDRESS_STDERR(symbol_addr, 0);
- SEND_STDERR(", ");
- SEND_ADDRESS_STDERR(load_addr, 1);
- _dl_exit(1);
- }
- }
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