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- /*
- * Copyright (C) 2016 Andes Technology, Inc.
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
- /* Need bootstrap relocations */
- #define ARCH_NEEDS_BOOTSTRAP_RELOCS
- __asm__("\
- .text\n\
- .globl _start\n\
- .globl _dl_start\n\
- .globl _dl_start_user\n\
- .type _start,#function\n\
- .type _dl_start,#function\n\
- .type _dl_start_user,#function\n\
- .align 4\n\
- .pic\n\
- _start:\n\
- ! we are PIC code, so get global offset table\n\
- mfusr $r15, $PC \n\
- sethi $gp, HI20(_GLOBAL_OFFSET_TABLE_ + 4)\n\
- ori $gp, $gp, LO12(_GLOBAL_OFFSET_TABLE_ + 8)\n\
- add $gp, $r15, $gp\n\
- \n\
- ! at start time, all the args are on the stack\n\
- addi $r0, $sp, 0\n\
- ! adjust stack\n\
- !addi $sp, $sp, -24\n\
- bal _dl_start@PLT\n\
- ! save user entry point in r6\n\
- addi $r6, $r0, 0\n\
- ! adjust sp and reload registers\n\
- !addi $sp, $sp, 24\n\
- \n\
- _dl_start_user:\n\
- ! See if we were run as a command with the executable file\n\
- ! name as an extra leading argument.\n\
- ! skip these arguments\n\
- l.w $r2, _dl_skip_args@GOTOFF ! args to skip\n\
- lwi $r0, [$sp+0] ! original argc\n\
- slli $r1, $r2, 2 ! offset for new sp\n\
- add $sp, $sp, $r1 ! adjust sp to skip args\n\
- sub $r0, $r0, $r2 ! set new argc\n\
- swi $r0, [$sp+0] ! save new argc\n\
- \n\
- ! load address of _dl_fini finalizer function\n\
- la $r5, _dl_fini@GOTOFF\n\
- ! jump to the user_s entry point\n\
- jr $r6\n\
- .size _dl_start_user, . - _dl_start_user\n\
- .previous\n\
- ");
- #define COPY_UNALIGNED_WORD(swp, twp) \
- { \
- __typeof (swp) __tmp = __builtin_nds32_unaligned_load_w ((unsigned int*)&swp); \
- __builtin_nds32_unaligned_store_w ((unsigned int *)twp, __tmp); \
- }
- /* Get a pointer to the argv array. On many platforms this can be just
- * the address if 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)
- /* 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)
- {
- Elf32_Addr value;
- switch (ELF32_R_TYPE(rpnt->r_info)) {
- case R_NDS32_NONE:
- break;
- case R_NDS32_32:
- case R_NDS32_GLOB_DAT:
- case R_NDS32_JMP_SLOT:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_NDS32_32_RELA:
- value = symbol_addr + rpnt->r_addend;
- COPY_UNALIGNED_WORD (value, reloc_addr);
- break;
- #undef COPY_UNALIGNED_WORD
- case R_NDS32_RELATIVE:
- *reloc_addr = load_addr + rpnt->r_addend;
- break;
- default:
- SEND_STDERR("Unsupported relocation type\n");
- _dl_exit(1);
- }
- }
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