refactor sym & attributes
[tinycc.git] / arm64-link.c
blob73e503e6bb5513b1b59b06f1a4552207568fe077
1 #ifdef TARGET_DEFS_ONLY
3 #define EM_TCC_TARGET EM_AARCH64
5 #define R_DATA_32 R_AARCH64_ABS32
6 #define R_DATA_PTR R_AARCH64_ABS64
7 #define R_JMP_SLOT R_AARCH64_JUMP_SLOT
8 #define R_GLOB_DAT R_AARCH64_GLOB_DAT
9 #define R_COPY R_AARCH64_COPY
10 #define R_RELATIVE R_AARCH64_RELATIVE
12 #define R_NUM R_AARCH64_NUM
14 #define ELF_START_ADDR 0x00400000
15 #define ELF_PAGE_SIZE 0x1000
17 #define PCRELATIVE_DLLPLT 1
18 #define RELOCATE_DLLPLT 1
20 #else /* !TARGET_DEFS_ONLY */
22 #include "tcc.h"
24 /* Returns 1 for a code relocation, 0 for a data relocation. For unknown
25 relocations, returns -1. */
26 int code_reloc (int reloc_type)
28 switch (reloc_type) {
29 case R_AARCH64_ABS32:
30 case R_AARCH64_ABS64:
31 case R_AARCH64_PREL32:
32 case R_AARCH64_MOVW_UABS_G0_NC:
33 case R_AARCH64_MOVW_UABS_G1_NC:
34 case R_AARCH64_MOVW_UABS_G2_NC:
35 case R_AARCH64_MOVW_UABS_G3:
36 case R_AARCH64_ADR_PREL_PG_HI21:
37 case R_AARCH64_ADD_ABS_LO12_NC:
38 case R_AARCH64_ADR_GOT_PAGE:
39 case R_AARCH64_LD64_GOT_LO12_NC:
40 case R_AARCH64_GLOB_DAT:
41 case R_AARCH64_COPY:
42 return 0;
44 case R_AARCH64_JUMP26:
45 case R_AARCH64_CALL26:
46 case R_AARCH64_JUMP_SLOT:
47 return 1;
50 tcc_error ("Unknown relocation type: %d", reloc_type);
51 return -1;
54 /* Returns an enumerator to describe whether and when the relocation needs a
55 GOT and/or PLT entry to be created. See tcc.h for a description of the
56 different values. */
57 int gotplt_entry_type (int reloc_type)
59 switch (reloc_type) {
60 case R_AARCH64_PREL32:
61 case R_AARCH64_MOVW_UABS_G0_NC:
62 case R_AARCH64_MOVW_UABS_G1_NC:
63 case R_AARCH64_MOVW_UABS_G2_NC:
64 case R_AARCH64_MOVW_UABS_G3:
65 case R_AARCH64_ADR_PREL_PG_HI21:
66 case R_AARCH64_ADD_ABS_LO12_NC:
67 case R_AARCH64_GLOB_DAT:
68 case R_AARCH64_JUMP_SLOT:
69 case R_AARCH64_COPY:
70 return NO_GOTPLT_ENTRY;
72 case R_AARCH64_ABS32:
73 case R_AARCH64_ABS64:
74 case R_AARCH64_JUMP26:
75 case R_AARCH64_CALL26:
76 return AUTO_GOTPLT_ENTRY;
78 case R_AARCH64_ADR_GOT_PAGE:
79 case R_AARCH64_LD64_GOT_LO12_NC:
80 return ALWAYS_GOTPLT_ENTRY;
83 tcc_error ("Unknown relocation type: %d", reloc_type);
84 return -1;
87 ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
89 Section *plt = s1->plt;
90 uint8_t *p;
91 unsigned plt_offset;
93 if (s1->output_type == TCC_OUTPUT_DLL)
94 tcc_error("DLLs unimplemented!");
96 if (plt->data_offset == 0) {
97 section_ptr_add(plt, 32);
99 plt_offset = plt->data_offset;
101 p = section_ptr_add(plt, 16);
102 write32le(p, got_offset);
103 write32le(p + 4, (uint64_t) got_offset >> 32);
104 return plt_offset;
107 /* relocate the PLT: compute addresses and offsets in the PLT now that final
108 address for PLT and GOT are known (see fill_program_header) */
109 ST_FUNC void relocate_plt(TCCState *s1)
111 uint8_t *p, *p_end;
113 if (!s1->plt)
114 return;
116 p = s1->plt->data;
117 p_end = p + s1->plt->data_offset;
119 if (p < p_end) {
120 uint64_t plt = s1->plt->sh_addr;
121 uint64_t got = s1->got->sh_addr;
122 uint64_t off = (got >> 12) - (plt >> 12);
123 if ((off + ((uint32_t)1 << 20)) >> 21)
124 tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
125 write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
126 write32le(p + 4, (0x90000010 | // adrp x16,...
127 (off & 0x1ffffc) << 3 | (off & 3) << 29));
128 write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
129 (got & 0xff8) << 7));
130 write32le(p + 12, (0x91000210 | // add x16,x16,#...
131 (got & 0xfff) << 10));
132 write32le(p + 16, 0xd61f0220); // br x17
133 write32le(p + 20, 0xd503201f); // nop
134 write32le(p + 24, 0xd503201f); // nop
135 write32le(p + 28, 0xd503201f); // nop
136 p += 32;
137 while (p < p_end) {
138 uint64_t pc = plt + (p - s1->plt->data);
139 uint64_t addr = got + read64le(p);
140 uint64_t off = (addr >> 12) - (pc >> 12);
141 if ((off + ((uint32_t)1 << 20)) >> 21)
142 tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
143 write32le(p, (0x90000010 | // adrp x16,...
144 (off & 0x1ffffc) << 3 | (off & 3) << 29));
145 write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
146 (addr & 0xff8) << 7));
147 write32le(p + 8, (0x91000210 | // add x16,x16,#...
148 (addr & 0xfff) << 10));
149 write32le(p + 12, 0xd61f0220); // br x17
150 p += 16;
155 void relocate_init(Section *sr) {}
157 void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
159 int sym_index = ELFW(R_SYM)(rel->r_info);
160 #ifdef DEBUG_RELOC
161 ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
162 #endif
164 switch(type) {
165 case R_AARCH64_ABS64:
166 write64le(ptr, val);
167 return;
168 case R_AARCH64_ABS32:
169 write32le(ptr, val);
170 return;
171 case R_AARCH64_PREL32:
172 write32le(ptr, val - addr);
173 return;
174 case R_AARCH64_MOVW_UABS_G0_NC:
175 write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
176 (val & 0xffff) << 5));
177 return;
178 case R_AARCH64_MOVW_UABS_G1_NC:
179 write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
180 (val >> 16 & 0xffff) << 5));
181 return;
182 case R_AARCH64_MOVW_UABS_G2_NC:
183 write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
184 (val >> 32 & 0xffff) << 5));
185 return;
186 case R_AARCH64_MOVW_UABS_G3:
187 write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
188 (val >> 48 & 0xffff) << 5));
189 return;
190 case R_AARCH64_ADR_PREL_PG_HI21: {
191 uint64_t off = (val >> 12) - (addr >> 12);
192 if ((off + ((uint64_t)1 << 20)) >> 21)
193 tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
194 write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
195 (off & 0x1ffffc) << 3 | (off & 3) << 29));
196 return;
198 case R_AARCH64_ADD_ABS_LO12_NC:
199 write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
200 (val & 0xfff) << 10));
201 return;
202 case R_AARCH64_JUMP26:
203 case R_AARCH64_CALL26:
204 #ifdef DEBUG_RELOC
205 printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
206 (char *) symtab_section->link->data + sym->st_name);
207 #endif
208 if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
209 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
210 " (val=%lx, addr=%lx)", val, addr);
211 write32le(ptr, (0x14000000 |
212 (uint32_t)(type == R_AARCH64_CALL26) << 31 |
213 ((val - addr) >> 2 & 0x3ffffff)));
214 return;
215 case R_AARCH64_ADR_GOT_PAGE: {
216 uint64_t off =
217 (((s1->got->sh_addr +
218 s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
219 if ((off + ((uint64_t)1 << 20)) >> 21)
220 tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
221 write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
222 (off & 0x1ffffc) << 3 | (off & 3) << 29));
223 return;
225 case R_AARCH64_LD64_GOT_LO12_NC:
226 write32le(ptr,
227 ((read32le(ptr) & 0xfff803ff) |
228 ((s1->got->sh_addr +
229 s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
230 return;
231 case R_AARCH64_COPY:
232 return;
233 case R_AARCH64_GLOB_DAT:
234 case R_AARCH64_JUMP_SLOT:
235 /* They don't need addend */
236 #ifdef DEBUG_RELOC
237 printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
238 val - rel->r_addend,
239 (char *) symtab_section->link->data + sym->st_name);
240 #endif
241 write64le(ptr, val - rel->r_addend);
242 return;
243 default:
244 fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
245 type, (unsigned)addr, ptr, (unsigned)val);
246 return;
250 #endif /* !TARGET_DEFS_ONLY */