Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <stdio.h>
4#include <stdlib.h>
5#include <objtool/check.h>
6#include <objtool/disas.h>
7#include <objtool/elf.h>
8#include <objtool/arch.h>
9#include <objtool/warn.h>
10#include <objtool/builtin.h>
11
12const char *arch_reg_name[CFI_NUM_REGS] = {
13 "r0", "sp", "r2", "r3",
14 "r4", "r5", "r6", "r7",
15 "r8", "r9", "r10", "r11",
16 "r12", "r13", "r14", "r15",
17 "r16", "r17", "r18", "r19",
18 "r20", "r21", "r22", "r23",
19 "r24", "r25", "r26", "r27",
20 "r28", "r29", "r30", "r31",
21 "ra"
22};
23
24int arch_ftrace_match(const char *name)
25{
26 return !strcmp(name, "_mcount");
27}
28
29s64 arch_insn_adjusted_addend(struct instruction *insn, struct reloc *reloc)
30{
31 return reloc_addend(reloc);
32}
33
34bool arch_callee_saved_reg(unsigned char reg)
35{
36 return false;
37}
38
39int arch_decode_hint_reg(u8 sp_reg, int *base)
40{
41 exit(-1);
42}
43
44const char *arch_nop_insn(int len)
45{
46 exit(-1);
47}
48
49const char *arch_ret_insn(int len)
50{
51 exit(-1);
52}
53
54int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
55 unsigned long offset, unsigned int maxlen,
56 struct instruction *insn)
57{
58 unsigned int opcode;
59 enum insn_type typ;
60 unsigned long imm;
61 u32 ins;
62
63 ins = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));
64 opcode = ins >> 26;
65 typ = INSN_OTHER;
66 imm = 0;
67
68 switch (opcode) {
69 case 18: /* b[l][a] */
70 if (ins == 0x48000005) /* bl .+4 */
71 typ = INSN_OTHER;
72 else if (ins & 1) /* bl[a] */
73 typ = INSN_CALL;
74 else /* b[a] */
75 typ = INSN_JUMP_UNCONDITIONAL;
76
77 imm = ins & 0x3fffffc;
78 if (imm & 0x2000000)
79 imm -= 0x4000000;
80 imm |= ins & 2; /* AA flag */
81 break;
82 }
83
84 if (opcode == 1)
85 insn->len = 8;
86 else
87 insn->len = 4;
88
89 insn->type = typ;
90 insn->immediate = imm;
91
92 return 0;
93}
94
95unsigned long arch_jump_destination(struct instruction *insn)
96{
97 if (insn->immediate & 2)
98 return insn->immediate & ~2;
99
100 return insn->offset + insn->immediate;
101}
102
103bool arch_pc_relative_reloc(struct reloc *reloc)
104{
105 /*
106 * The powerpc build only allows certain relocation types, see
107 * relocs_check.sh, and none of those accepted are PC relative.
108 */
109 return false;
110}
111
112void arch_initial_func_cfi_state(struct cfi_init_state *state)
113{
114 int i;
115
116 for (i = 0; i < CFI_NUM_REGS; i++) {
117 state->regs[i].base = CFI_UNDEFINED;
118 state->regs[i].offset = 0;
119 }
120
121 /* initial CFA (call frame address) */
122 state->cfa.base = CFI_SP;
123 state->cfa.offset = 0;
124
125 /* initial LR (return address) */
126 state->regs[CFI_RA].base = CFI_CFA;
127 state->regs[CFI_RA].offset = 0;
128}
129
130unsigned int arch_reloc_size(struct reloc *reloc)
131{
132 switch (reloc_type(reloc)) {
133 case R_PPC_REL32:
134 case R_PPC_ADDR32:
135 case R_PPC_UADDR32:
136 case R_PPC_PLT32:
137 case R_PPC_PLTREL32:
138 return 4;
139 default:
140 return 8;
141 }
142}
143
144#ifdef DISAS
145
146int arch_disas_info_init(struct disassemble_info *dinfo)
147{
148 return disas_info_init(dinfo, bfd_arch_powerpc,
149 bfd_mach_ppc, bfd_mach_ppc64,
150 NULL);
151}
152
153#endif /* DISAS */