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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 | /* * Various assembly language/system dependent hacks that are required * so that we can minimize the amount of platform specific code. * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org> */ #ifndef _ARCH_DL_SYSDEP #define _ARCH_DL_SYSDEP /* Define this if the system uses RELOCA. */ #undef ELF_USES_RELOCA #include <elf.h> /* Initialization sequence for the GOT. */ #define INIT_GOT(GOT_BASE,MODULE) \ { \ GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \ GOT_BASE[1] = (unsigned long) MODULE; \ } static __always_inline unsigned long arm_modulus(unsigned long m, unsigned long p) { unsigned long i,t,inc; i=p; t=0; while (!(i&(1<<31))) { i<<=1; t++; } t--; for (inc=t;inc>2;inc--) { i=p<<inc; if (i&(1<<31)) break; while (m>=i) { m-=i; i<<=1; if (i&(1<<31)) break; if (i<p) break; } } while (m>=p) { m-=p; } return m; } #define do_rem(result, n, base) ((result) = arm_modulus(n, base)) #define do_div_10(result, remain) ((result) = (((result) - (remain)) / 2) * -(-1ul / 5ul)) /* Here we define the magic numbers that this dynamic loader should accept */ #define MAGIC1 EM_ARM #undef MAGIC2 /* Used for error messages */ #define ELF_TARGET "ARM" struct elf_resolve; unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry); /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS variable, so undefined references should not be allowed to define the value. ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one of the main executable's symbols, as for a COPY reloc. */ #define elf_machine_type_class(type) \ ((((type) == R_ARM_JUMP_SLOT || (type) == R_ARM_TLS_DTPMOD32 \ || (type) == R_ARM_TLS_DTPOFF32 || (type) == R_ARM_TLS_TPOFF32) \ * ELF_RTYPE_CLASS_PLT) \ | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY)) /* Return the link-time address of _DYNAMIC. Conveniently, this is the first element of the GOT. We used to use the PIC register to do this without a constant pool reference, but GCC 4.2 will use a pseudo-register for the PIC base, so it may not be in r10. */ static __always_inline Elf32_Addr __attribute__ ((unused)) elf_machine_dynamic (void) { Elf32_Addr dynamic; #if !defined __thumb__ __asm__ ("ldr %0, 2f\n" "1: ldr %0, [pc, %0]\n" "b 3f\n" "2: .word _GLOBAL_OFFSET_TABLE_ - (1b+8)\n" "3:" : "=r" (dynamic)); #else int tmp; __asm__ (".align 2\n" "bx pc\n" "nop\n" ".arm\n" "ldr %0, 2f\n" "1: ldr %0, [pc, %0]\n" "b 3f\n" "2: .word _GLOBAL_OFFSET_TABLE_ - (1b+8)\n" "3:" ".align 2\n" "orr %1, pc, #1\n" "bx %1\n" ".force_thumb\n" : "=r" (dynamic), "=&r" (tmp)); #endif return dynamic; } extern char __dl_start[] __asm__("_dl_start"); /* Return the run-time load address of the shared object. */ static __always_inline Elf32_Addr __attribute__ ((unused)) elf_machine_load_address (void) { Elf32_Addr got_addr = (Elf32_Addr) &__dl_start; Elf32_Addr pcrel_addr; #if defined __OPTIMIZE__ && !defined __thumb__ __asm__ ("adr %0, _dl_start" : "=r" (pcrel_addr)); #else /* A simple adr does not work in Thumb mode because the offset is negative, and for debug builds may be too large. */ int tmp; __asm__ ("adr %1, 1f\n\t" "ldr %0, [%1]\n\t" "add %0, %0, %1\n\t" "b 2f\n\t" ".align 2\n\t" "1: .word _dl_start - 1b\n\t" "2:" : "=r" (pcrel_addr), "=r" (tmp)); #endif return pcrel_addr - got_addr; } static __always_inline void elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr, Elf32_Word relative_count) { Elf32_Rel * rpnt = (void *) rel_addr; --rpnt; do { Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset); *reloc_addr += load_off; } while (--relative_count); } #endif /* !_ARCH_DL_SYSDEP */ #ifdef __ARM_EABI__ #define DL_MALLOC_ALIGN 8 /* EABI needs 8 byte alignment for STRD LDRD */ #endif |