projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 549e8152 PM |
2 | /* |
| 3 | * Code to process dynamic relocations in the kernel. | |
| 4 | * | |
| 5 | * Copyright 2008 Paul Mackerras, IBM Corp. | |
| 549e8152 PM |
6 | */ |
| 7 | ||
| 8 | #include <asm/ppc_asm.h> | |
| 9 | ||
| 10 | RELA = 7 | |
| d7997691 AK |
11 | RELASZ = 8 |
| 12 | RELAENT = 9 | |
| 549e8152 | 13 | R_PPC64_RELATIVE = 22 |
| d7997691 | 14 | R_PPC64_UADDR64 = 43 |
| 549e8152 PM |
15 | |
| 16 | /* | |
| 17 | * r3 = desired final address of kernel | |
| 18 | */ | |
| 19 | _GLOBAL(relocate) | |
| 20 | mflr r0 | |
| 21 | bcl 20,31,$+4 | |
| 22 | 0: mflr r12 /* r12 has runtime addr of label 0 */ | |
| 23 | mtlr r0 | |
| 24 | ld r11,(p_dyn - 0b)(r12) | |
| 25 | add r11,r11,r12 /* r11 has runtime addr of .dynamic section */ | |
| 26 | ld r9,(p_rela - 0b)(r12) | |
| 27 | add r9,r9,r12 /* r9 has runtime addr of .rela.dyn section */ | |
| 28 | ld r10,(p_st - 0b)(r12) | |
| 29 | add r10,r10,r12 /* r10 has runtime addr of _stext */ | |
| b830c875 NP |
30 | ld r4,(p_sym - 0b)(r12) |
| 31 | add r4,r4,r12 /* r4 has runtime addr of .dynsym */ | |
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32 | |
| 33 | /* | |
| d7997691 | 34 | * Scan the dynamic section for the RELA, RELASZ and RELAENT entries. |
| 549e8152 PM |
35 | */ |
| 36 | li r7,0 | |
| 37 | li r8,0 | |
| d7997691 AK |
38 | .Ltags: |
| 39 | ld r6,0(r11) /* get tag */ | |
| 549e8152 | 40 | cmpdi r6,0 |
| d7997691 | 41 | beq .Lend_of_list /* end of list */ |
| 549e8152 PM |
42 | cmpdi r6,RELA |
| 43 | bne 2f | |
| 44 | ld r7,8(r11) /* get RELA pointer in r7 */ | |
| d7997691 AK |
45 | b 4f |
| 46 | 2: cmpdi r6,RELASZ | |
| 549e8152 | 47 | bne 3f |
| d7997691 AK |
48 | ld r8,8(r11) /* get RELASZ value in r8 */ |
| 49 | b 4f | |
| 50 | 3: cmpdi r6,RELAENT | |
| 51 | bne 4f | |
| 52 | ld r12,8(r11) /* get RELAENT value in r12 */ | |
| 53 | 4: addi r11,r11,16 | |
| 54 | b .Ltags | |
| 55 | .Lend_of_list: | |
| 56 | cmpdi r7,0 /* check we have RELA, RELASZ, RELAENT */ | |
| 549e8152 | 57 | cmpdi cr1,r8,0 |
| d7997691 AK |
58 | beq .Lout |
| 59 | beq cr1,.Lout | |
| 60 | cmpdi r12,0 | |
| 61 | beq .Lout | |
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62 | |
| 63 | /* | |
| 64 | * Work out linktime address of _stext and hence the | |
| 65 | * relocation offset to be applied. | |
| 66 | * cur_offset [r7] = rela.run [r9] - rela.link [r7] | |
| 67 | * _stext.link [r10] = _stext.run [r10] - cur_offset [r7] | |
| 68 | * final_offset [r3] = _stext.final [r3] - _stext.link [r10] | |
| 69 | */ | |
| 70 | subf r7,r7,r9 /* cur_offset */ | |
| 71 | subf r10,r7,r10 | |
| 72 | subf r3,r10,r3 /* final_offset */ | |
| 73 | ||
| 74 | /* | |
| 75 | * Run through the list of relocations and process the | |
| d7997691 | 76 | * R_PPC64_RELATIVE and R_PPC64_UADDR64 ones. |
| 549e8152 | 77 | */ |
| d7997691 | 78 | divd r8,r8,r12 /* RELASZ / RELAENT */ |
| 549e8152 | 79 | mtctr r8 |
| d7997691 | 80 | .Lrels: ld r0,8(r9) /* ELF64_R_TYPE(reloc->r_info) */ |
| 3b830c82 | 81 | cmpdi r0,R_PPC64_RELATIVE |
| d7997691 | 82 | bne .Luaddr64 |
| 549e8152 PM |
83 | ld r6,0(r9) /* reloc->r_offset */ |
| 84 | ld r0,16(r9) /* reloc->r_addend */ | |
| d7997691 AK |
85 | b .Lstore |
| 86 | .Luaddr64: | |
| b830c875 | 87 | srdi r5,r0,32 /* ELF64_R_SYM(reloc->r_info) */ |
| d7997691 AK |
88 | clrldi r0,r0,32 |
| 89 | cmpdi r0,R_PPC64_UADDR64 | |
| 90 | bne .Lnext | |
| 91 | ld r6,0(r9) | |
| 92 | ld r0,16(r9) | |
| b830c875 NP |
93 | mulli r5,r5,24 /* 24 == sizeof(elf64_sym) */ |
| 94 | add r5,r5,r4 /* elf64_sym[ELF64_R_SYM] */ | |
| 95 | ld r5,8(r5) | |
| 96 | add r0,r0,r5 | |
| d7997691 | 97 | .Lstore: |
| 549e8152 PM |
98 | add r0,r0,r3 |
| 99 | stdx r0,r7,r6 | |
| d7997691 AK |
100 | .Lnext: |
| 101 | add r9,r9,r12 | |
| 102 | bdnz .Lrels | |
| 103 | .Lout: | |
| 104 | blr | |
| 549e8152 | 105 | |
| a5b2cf5b | 106 | .balign 8 |
| eb039161 TH |
107 | p_dyn: .8byte __dynamic_start - 0b |
| 108 | p_rela: .8byte __rela_dyn_start - 0b | |
| d7997691 | 109 | p_sym: .8byte __dynamic_symtab - 0b |
| eb039161 | 110 | p_st: .8byte _stext - 0b |
| 549e8152 | 111 |