| 1 | /* reloc_x86_64.c - position independent x86_64 ELF shared object relocator |
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| 2 | Copyright (C) 1999 Hewlett-Packard Co. |
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| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
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| 4 | Copyright (C) 2005 Intel Co. |
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| 5 | Contributed by Fenghua Yu <fenghua.yu@intel.com>. |
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| 6 | |
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| 7 | All rights reserved. |
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| 8 | |
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| 9 | Redistribution and use in source and binary forms, with or without |
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| 10 | modification, are permitted provided that the following conditions |
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| 11 | are met: |
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| 12 | |
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| 13 | * Redistributions of source code must retain the above copyright |
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| 14 | notice, this list of conditions and the following disclaimer. |
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| 15 | * Redistributions in binary form must reproduce the above |
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| 16 | copyright notice, this list of conditions and the following |
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| 17 | disclaimer in the documentation and/or other materials |
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| 18 | provided with the distribution. |
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| 19 | * Neither the name of Hewlett-Packard Co. nor the names of its |
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| 20 | contributors may be used to endorse or promote products derived |
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| 21 | from this software without specific prior written permission. |
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| 22 | |
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| 23 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 24 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 25 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 26 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 27 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
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| 28 | BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
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| 29 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 30 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 31 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 32 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
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| 33 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
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| 34 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 35 | SUCH DAMAGE. |
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| 36 | */ |
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| 37 | |
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| 38 | #include <efi.h> |
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| 39 | #include <efilib.h> |
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| 40 | |
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| 41 | #include <elf.h> |
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| 42 | |
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| 43 | EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn, EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) |
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| 44 | { |
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| 45 | long relsz = 0, relent = 0; |
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| 46 | Elf64_Rel *rel = 0; |
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| 47 | unsigned long *addr; |
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| 48 | int i; |
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| 49 | |
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| 50 | for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { |
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| 51 | switch (dyn[i].d_tag) { |
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| 52 | case DT_RELA: |
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| 53 | rel = (Elf64_Rel*) |
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| 54 | ((unsigned long)dyn[i].d_un.d_ptr |
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| 55 | + ldbase); |
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| 56 | break; |
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| 57 | |
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| 58 | case DT_RELASZ: |
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| 59 | relsz = dyn[i].d_un.d_val; |
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| 60 | break; |
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| 61 | |
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| 62 | case DT_RELAENT: |
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| 63 | relent = dyn[i].d_un.d_val; |
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| 64 | break; |
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| 65 | |
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| 66 | default: |
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| 67 | break; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | if (!rel && relent == 0) |
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| 72 | return EFI_SUCCESS; |
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| 73 | |
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| 74 | if (!rel || relent == 0) |
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| 75 | return EFI_LOAD_ERROR; |
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| 76 | |
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| 77 | while (relsz > 0) { |
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| 78 | /* apply the relocs */ |
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| 79 | switch (ELF64_R_TYPE (rel->r_info)) { |
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| 80 | case R_X86_64_NONE: |
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| 81 | break; |
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| 82 | |
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| 83 | case R_X86_64_RELATIVE: |
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| 84 | addr = (unsigned long *) |
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| 85 | (ldbase + rel->r_offset); |
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| 86 | *addr += ldbase; |
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| 87 | break; |
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| 88 | |
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| 89 | default: |
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| 90 | break; |
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| 91 | } |
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| 92 | rel = (Elf64_Rel*) ((char *) rel + relent); |
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| 93 | relsz -= relent; |
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| 94 | } |
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| 95 | return EFI_SUCCESS; |
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| 96 | } |
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