1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * Code to process dynamic relocations in the
4 *
5 * Copyright 2008 Paul Mackerras, IBM Corp.
6 */
7
8 #include <asm/ppc_asm.h>
9
10 RELA = 7
11 RELASZ = 8
12 RELAENT = 9
13 R_PPC64_RELATIVE = 22
14 R_PPC64_UADDR64 = 43
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 run
23 mtlr r0
24 ld r11,(p_dyn - 0b)(r12)
25 add r11,r11,r12 /* r11 has run
26 ld r9,(p_rela - 0b)(r12)
27 add r9,r9,r12 /* r9 has runt
28 ld r10,(p_st - 0b)(r12)
29 add r10,r10,r12 /* r10 has run
30 ld r4,(p_sym - 0b)(r12)
31 add r4,r4,r12 /* r4 has runt
32
33 /*
34 * Scan the dynamic section for the RE
35 */
36 li r7,0
37 li r8,0
38 .Ltags:
39 ld r6,0(r11) /* get tag */
40 cmpdi r6,0
41 beq .Lend_of_list /* end
42 cmpdi r6,RELA
43 bne 2f
44 ld r7,8(r11) /* get RELA po
45 b 4f
46 2: cmpdi r6,RELASZ
47 bne 3f
48 ld r8,8(r11) /* get RELASZ
49 b 4f
50 3: cmpdi r6,RELAENT
51 bne 4f
52 ld r12,8(r11) /* get RELAENT
53 4: addi r11,r11,16
54 b .Ltags
55 .Lend_of_list:
56 cmpdi r7,0 /* check we ha
57 cmpdi cr1,r8,0
58 beq .Lout
59 beq cr1,.Lout
60 cmpdi r12,0
61 beq .Lout
62
63 /*
64 * Work out linktime address of _stext
65 * relocation offset to be applied.
66 * cur_offset [r7] = rela.run [r9] - r
67 * _stext.link [r10] = _stext.run [r10
68 * final_offset [r3] = _stext.final [r
69 */
70 subf r7,r7,r9 /* cur_offset
71 subf r10,r7,r10
72 subf r3,r10,r3 /* final_offse
73
74 /*
75 * Run through the list of relocations
76 * R_PPC64_RELATIVE and R_PPC64_UADDR6
77 */
78 divd r8,r8,r12 /* RELASZ / RE
79 mtctr r8
80 .Lrels: ld r0,8(r9) /* ELF
81 cmpdi r0,R_PPC64_RELATIVE
82 bne .Luaddr64
83 ld r6,0(r9) /* reloc->r_of
84 ld r0,16(r9) /* reloc->r_ad
85 b .Lstore
86 .Luaddr64:
87 srdi r5,r0,32 /* ELF64_R_SYM
88 clrldi r0,r0,32
89 cmpdi r0,R_PPC64_UADDR64
90 bne .Lnext
91 ld r6,0(r9)
92 ld r0,16(r9)
93 mulli r5,r5,24 /* 24 == sizeo
94 add r5,r5,r4 /* elf64_sym[E
95 ld r5,8(r5)
96 add r0,r0,r5
97 .Lstore:
98 add r0,r0,r3
99 stdx r0,r7,r6
100 .Lnext:
101 add r9,r9,r12
102 bdnz .Lrels
103 .Lout:
104 blr
105
106 .balign 8
107 p_dyn: .8byte __dynamic_start - 0b
108 p_rela: .8byte __rela_dyn_start - 0b
109 p_sym: .8byte __dynamic_symtab - 0b
110 p_st: .8byte _stext - 0b
111
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