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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /* * 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); } } |