[ae5fe7e6] | 1 | /* |
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| 2 | * Taken from NetBSD and stripped of the relocations not needed on RTEMS. |
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| 3 | */ |
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| 4 | |
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| 5 | /* $NetBSD: mdreloc.c,v 1.26 2010/01/14 11:58:32 skrll Exp $ */ |
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| 6 | |
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| 7 | #include <sys/cdefs.h> |
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| 8 | |
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| 9 | #include <errno.h> |
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| 10 | #include <stdio.h> |
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| 11 | #include <sys/types.h> |
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| 12 | #include <sys/stat.h> |
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| 13 | |
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| 14 | #include <rtems/rtl/rtl.h> |
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| 15 | #include "rtl-elf.h" |
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| 16 | #include "rtl-error.h" |
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[990adc5] | 17 | #include <rtems/rtl/rtl-trace.h> |
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[c6eead1] | 18 | #include "rtl-unwind.h" |
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| 19 | #include "rtl-unwind-dw2.h" |
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[ae5fe7e6] | 20 | |
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| 21 | static inline int overflow_8_check(int value) |
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| 22 | { |
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| 23 | if ((value & 0xffffff00) && (~value & 0xffffff80)) |
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| 24 | return true; |
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| 25 | return false; |
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| 26 | } |
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| 27 | |
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| 28 | static inline int overflow_16_check(int value) |
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| 29 | { |
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| 30 | if ((value & 0xffff0000) && (~value & 0xffff8000)) |
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| 31 | return true; |
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| 32 | return false; |
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| 33 | } |
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| 34 | |
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[c6eead1] | 35 | uint32_t |
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[f59d435d] | 36 | rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj, |
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| 37 | const Elf_Shdr* shdr) |
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[c6eead1] | 38 | { |
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| 39 | return 0; |
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| 40 | } |
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| 41 | |
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[6c9f017] | 42 | uint32_t |
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| 43 | rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj, |
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| 44 | int section, |
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| 45 | const char* name, |
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| 46 | const Elf_Shdr* shdr, |
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| 47 | const uint32_t flags) |
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| 48 | { |
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| 49 | (void) obj; |
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| 50 | (void) section; |
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| 51 | (void) name; |
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| 52 | (void) shdr; |
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| 53 | return flags; |
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| 54 | } |
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| 55 | |
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| 56 | bool |
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| 57 | rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj, |
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| 58 | rtems_rtl_obj_sect* sect) |
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| 59 | { |
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| 60 | (void) obj; |
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| 61 | (void) sect; |
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| 62 | return false; |
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| 63 | } |
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| 64 | |
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| 65 | bool |
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| 66 | rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj, |
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| 67 | rtems_rtl_obj_sect* sect) |
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| 68 | { |
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| 69 | (void) obj; |
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| 70 | (void) sect; |
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| 71 | return false; |
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| 72 | } |
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| 73 | |
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[ae5fe7e6] | 74 | bool |
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| 75 | rtems_rtl_elf_rel_resolve_sym (Elf_Word type) |
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| 76 | { |
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| 77 | return true; |
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| 78 | } |
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| 79 | |
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[d8c70ba6] | 80 | size_t |
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| 81 | rtems_rtl_elf_relocate_tramp_max_size (void) |
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| 82 | { |
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| 83 | /* |
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| 84 | * Disable by returning 0. |
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| 85 | */ |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |
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[ae5fe7e6] | 89 | bool |
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[d8c70ba6] | 90 | rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj* obj, |
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| 91 | const Elf_Rela* rela, |
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| 92 | const rtems_rtl_obj_sect* sect, |
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| 93 | const char* symname, |
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| 94 | const Elf_Byte syminfo, |
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| 95 | const Elf_Word symvalue) |
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| 96 | { |
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| 97 | (void) obj; |
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| 98 | (void) rela; |
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| 99 | (void) sect; |
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| 100 | (void) symname; |
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| 101 | (void) syminfo; |
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| 102 | (void) symvalue; |
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| 103 | return true; |
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| 104 | } |
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| 105 | |
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| 106 | bool |
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| 107 | rtems_rtl_elf_relocate_rela (rtems_rtl_obj* obj, |
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[f59d435d] | 108 | const Elf_Rela* rela, |
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| 109 | const rtems_rtl_obj_sect* sect, |
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| 110 | const char* symnane, |
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| 111 | const Elf_Byte syminfo, |
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| 112 | const Elf_Word symvalue) |
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[ae5fe7e6] | 113 | { |
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[f59d435d] | 114 | Elf_Addr target = 0; |
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[ae5fe7e6] | 115 | Elf_Addr* where; |
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| 116 | Elf_Word tmp; |
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| 117 | |
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| 118 | where = (Elf_Addr *)(sect->base + rela->r_offset); |
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| 119 | |
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| 120 | switch (ELF_R_TYPE(rela->r_info)) { |
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| 121 | case R_TYPE(NONE): |
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| 122 | break; |
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| 123 | |
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| 124 | case R_TYPE(PC8): |
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| 125 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
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| 126 | if (overflow_8_check(tmp)) |
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| 127 | return false; |
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| 128 | |
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| 129 | *(uint8_t *)where = tmp; |
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| 130 | |
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| 131 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 132 | printf ("rtl: reloc R_TYPE_8/PC8 in %s --> %p (%p) in %s\n", |
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| 133 | sect->name, (void*) (symvalue + rela->r_addend), |
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| 134 | (void *)*where, rtems_rtl_obj_oname (obj)); |
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| 135 | break; |
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| 136 | |
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| 137 | case R_TYPE(PC16): |
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| 138 | tmp = symvalue + rela->r_addend - (Elf_Addr)where; |
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| 139 | if (overflow_16_check(tmp)) |
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| 140 | return false; |
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| 141 | |
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| 142 | *(uint16_t*)where = tmp; |
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| 143 | |
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| 144 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 145 | printf ("rtl: reloc R_TYPE_16/PC16 in %s --> %p (%p) in %s\n", |
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| 146 | sect->name, (void*) (symvalue + rela->r_addend), |
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| 147 | (void *)*where, rtems_rtl_obj_oname (obj)); |
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| 148 | break; |
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| 149 | case R_TYPE(PC32): |
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| 150 | target = (Elf_Addr) symvalue + rela->r_addend; |
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| 151 | *where += target - (Elf_Addr)where; |
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| 152 | |
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| 153 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 154 | printf ("rtl: reloc PC32 in %s --> %p (%p) in %s\n", |
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| 155 | sect->name, (void*) (symvalue + rela->r_addend), |
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| 156 | (void *)*where, rtems_rtl_obj_oname (obj)); |
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| 157 | break; |
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| 158 | |
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| 159 | case R_TYPE(GOT32): |
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| 160 | case R_TYPE(32): |
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| 161 | case R_TYPE(GLOB_DAT): |
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| 162 | target = (Elf_Addr) symvalue + rela->r_addend; |
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| 163 | |
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| 164 | if (*where != target) |
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| 165 | *where = target; |
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| 166 | |
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| 167 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 168 | printf ("rtl: reloc 32/GLOB_DAT in %s --> %p in %s\n", |
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| 169 | sect->name, (void *)*where, |
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| 170 | rtems_rtl_obj_oname (obj)); |
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| 171 | break; |
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| 172 | |
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| 173 | case R_TYPE(RELATIVE): |
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| 174 | *where += (Elf_Addr) sect->base + rela->r_addend; |
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| 175 | if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) |
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| 176 | printf ("rtl: reloc RELATIVE in %s --> %p\n", |
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| 177 | rtems_rtl_obj_oname (obj), (void *)*where); |
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| 178 | break; |
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| 179 | |
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| 180 | case R_TYPE(COPY): |
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| 181 | /* |
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| 182 | * These are deferred until all other relocations have |
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| 183 | * been done. All we do here is make sure that the |
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| 184 | * COPY relocation is not in a shared library. They |
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| 185 | * are allowed only in executable files. |
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| 186 | */ |
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| 187 | printf ("rtl: reloc COPY (please report)\n"); |
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| 188 | break; |
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| 189 | |
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| 190 | default: |
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[6c9f017] | 191 | printf ("rtl: reloc unknown: sym = %u, type = %u, offset = %p, " |
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[ae5fe7e6] | 192 | "contents = %p\n", |
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| 193 | ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info), |
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| 194 | (void *)rela->r_offset, (void *)*where); |
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| 195 | rtems_rtl_set_error (EINVAL, |
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[6c9f017] | 196 | "%s: Unsupported relocation type %d " |
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[ae5fe7e6] | 197 | "in non-PLT relocations", |
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| 198 | sect->name, (uint32_t) ELF_R_TYPE(rela->r_info)); |
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| 199 | return false; |
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| 200 | } |
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| 201 | |
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| 202 | return true; |
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| 203 | } |
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| 204 | |
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| 205 | bool |
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[d8c70ba6] | 206 | rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj* obj, |
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| 207 | const Elf_Rel* rel, |
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| 208 | const rtems_rtl_obj_sect* sect, |
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| 209 | const char* symname, |
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| 210 | const Elf_Byte syminfo, |
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| 211 | const Elf_Word symvalue) |
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| 212 | { |
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| 213 | (void) obj; |
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| 214 | (void) rel; |
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| 215 | (void) sect; |
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| 216 | (void) symname; |
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| 217 | (void) syminfo; |
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| 218 | (void) symvalue; |
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| 219 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
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| 220 | return false; |
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| 221 | } |
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| 222 | |
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| 223 | bool |
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| 224 | rtems_rtl_elf_relocate_rel (rtems_rtl_obj* obj, |
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[f59d435d] | 225 | const Elf_Rel* rel, |
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| 226 | const rtems_rtl_obj_sect* sect, |
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| 227 | const char* symname, |
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| 228 | const Elf_Byte syminfo, |
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| 229 | const Elf_Word symvalue) |
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[ae5fe7e6] | 230 | { |
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[d8c70ba6] | 231 | (void) obj; |
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| 232 | (void) rel; |
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| 233 | (void) sect; |
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| 234 | (void) symname; |
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| 235 | (void) syminfo; |
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| 236 | (void) symvalue; |
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[ae5fe7e6] | 237 | rtems_rtl_set_error (EINVAL, "rel type record not supported"); |
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| 238 | return false; |
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| 239 | } |
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[c6eead1] | 240 | |
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| 241 | bool |
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[f59d435d] | 242 | rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj, |
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| 243 | const char* name, |
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| 244 | uint32_t flags) |
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[c6eead1] | 245 | { |
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| 246 | return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags); |
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| 247 | } |
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| 248 | |
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| 249 | bool |
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[f59d435d] | 250 | rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj) |
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[c6eead1] | 251 | { |
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| 252 | return rtems_rtl_elf_unwind_dw2_register (obj); |
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| 253 | } |
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| 254 | |
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| 255 | bool |
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[f59d435d] | 256 | rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj) |
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[c6eead1] | 257 | { |
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| 258 | return rtems_rtl_elf_unwind_dw2_deregister (obj); |
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| 259 | } |
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