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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | /* Any assembly language/system dependent hacks needed to setup boot1.c so it * will work as expected and cope with whatever platform specific wierdness is * needed for this architecture. * Copyright (C) 2005 by Joakim Tjernlund * Copyright (C) 2005 by Erik Andersen */ #include <sgidefs.h> __asm__("" " .text\n" " .globl _start\n" " .ent _start\n" " .type _start,@function\n" " .hidden _start\n" "_start:\n" " .set noreorder\n" " move $25, $31\n" " bal 0f\n" " nop\n" "0:\n" #if _MIPS_SIM == _MIPS_SIM_ABI32 " .cpload $31\n" #else /* N32 || N64 */ " .cpsetup $31, $2, 0b\n" #endif /* N32 || N64 */ " move $31, $25\n" " .set reorder\n" #if _MIPS_SIM == _MIPS_SIM_ABI64 " dla $4, _DYNAMIC\n" " sd $4, -0x7ff0($28)\n" #else /* O32 || N32 */ " la $4, _DYNAMIC\n" " sw $4, -0x7ff0($28)\n" #endif /* O32 || N32 */ " move $4, $29\n" #if _MIPS_SIM == _MIPS_SIM_ABI32 " subu $29, 16\n" #endif #if _MIPS_SIM == _MIPS_SIM_ABI64 " dla $8, .coff\n" #else /* O32 || N32 */ " la $8, .coff\n" #endif /* O32 || N32 */ # if !defined __mips_isa_rev || __mips_isa_rev < 6 " bltzal $8, .coff\n" ".coff:\n" # else ".coff:\n" " lapc $31, .coff\n" # endif #if _MIPS_SIM == _MIPS_SIM_ABI64 " dsubu $8, $31, $8\n" " dla $25, _dl_start\n" " daddu $25, $8\n" #else /* O32 || N32 */ " subu $8, $31, $8\n" " la $25, _dl_start\n" " addu $25, $8\n" #endif /* O32 || N32 */ " jalr $25\n" #if _MIPS_SIM == _MIPS_SIM_ABI32 " addiu $29, 16\n" #endif " move $16, $28\n" " move $17, $2\n" #if _MIPS_SIM == _MIPS_SIM_ABI64 " ld $2, _dl_skip_args\n" " beq $2, $0, 1f\n" " ld $4, 0($29)\n" " dsubu $4, $2\n" " dsll $2, 2\n" " daddu $29, $2\n" " sd $4, 0($29)\n" "1:\n" " ld $5, 0($29)\n" " dla $6, 8 ($29)\n" " dsll $7, $5, 2\n" " daddu $7, $7, $6\n" " daddu $7, $7, 4\n" " and $2, $29, -4 * 4\n" " sd $29, -8($2)\n" " dsubu $29, $2, 32\n" " ld $29, 24($29)\n" " dla $2, _dl_fini\n" #else /* O32 || N32 */ " lw $2, _dl_skip_args\n" " beq $2, $0, 1f\n" " lw $4, 0($29)\n" " subu $4, $2\n" " sll $2, 2\n" " addu $29, $2\n" " sw $4, 0($29)\n" "1:\n" " lw $5, 0($29)\n" " la $6, 4 ($29)\n" " sll $7, $5, 2\n" " addu $7, $7, $6\n" " addu $7, $7, 4\n" " and $2, $29, -2 * 4\n" " sw $29, -4($2)\n" " subu $29, $2, 32\n" #if _MIPS_SIM == _MIPS_SIM_ABI32 " .cprestore 16\n" #endif " lw $29, 28($29)\n" " la $2, _dl_fini\n" #endif /* O32 || N32 */ " move $25, $17\n" " jr $25\n" ".end _start\n" ".size _start, . -_start\n" "\n\n" "\n\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 earlier in the dl startup process */ #define NO_FUNCS_BEFORE_BOOTSTRAP /* * Here is a macro to perform the GOT relocation. This is only * used when bootstrapping the dynamic loader. */ #define PERFORM_BOOTSTRAP_GOT(tpnt) \ do { \ ElfW(Sym) *sym; \ ElfW(Addr) i; \ register ElfW(Addr) gp __asm__ ("$28"); \ ElfW(Addr) *mipsgot = elf_mips_got_from_gpreg (gp); \ \ /* Add load address displacement to all local GOT entries */ \ i = 2; \ while (i < tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]) \ mipsgot[i++] += tpnt->loadaddr; \ \ /* Handle global GOT entries */ \ mipsgot += tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]; \ sym = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB] + \ tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX]; \ i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] - tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];\ \ while (i--) { \ if (sym->st_shndx == SHN_UNDEF || \ sym->st_shndx == SHN_COMMON) \ *mipsgot = tpnt->loadaddr + sym->st_value; \ else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC && \ *mipsgot != sym->st_value) \ *mipsgot += tpnt->loadaddr; \ else if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) { \ if (sym->st_other == 0) \ *mipsgot += tpnt->loadaddr; \ } \ else \ *mipsgot = tpnt->loadaddr + sym->st_value; \ \ mipsgot++; \ sym++; \ } \ } while (0) /* * Here is a macro to perform a relocation. This is only used when * bootstrapping the dynamic loader. */ #if _MIPS_SIM == _MIPS_SIM_ABI64 /* consult with glibc sysdeps/mips/dl-machine.h 1.69 */ #define R_MIPS_BOOTSTRAP_RELOC ((R_MIPS_64 << 8) | R_MIPS_REL32) #else /* N32 || O32 */ #define R_MIPS_BOOTSTRAP_RELOC R_MIPS_REL32 #endif #define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \ switch(ELF_R_TYPE((RELP)->r_info)) { \ case R_MIPS_BOOTSTRAP_RELOC: \ if (SYMTAB) { \ if (symtab_index<tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX])\ *REL += SYMBOL; \ } \ else { \ *REL += LOAD; \ } \ break; \ case R_MIPS_NONE: \ break; \ default: \ SEND_STDERR("Aiieeee!"); \ _dl_exit(1); \ } |