1 #ifdef TARGET_DEFS_ONLY
3 #define EM_TCC_TARGET EM_386
5 /* relocation type for 32 bit data relocation */
6 #define R_DATA_32 R_386_32
7 #define R_DATA_PTR R_386_32
8 #define R_JMP_SLOT R_386_JMP_SLOT
9 #define R_GLOB_DAT R_386_GLOB_DAT
10 #define R_COPY R_386_COPY
12 #define R_NUM R_386_NUM
14 #define ELF_START_ADDR 0x08048000
15 #define ELF_PAGE_SIZE 0x1000
17 #define PCRELATIVE_DLLPLT 0
18 #define RELOCATE_DLLPLT 0
20 #else /* !TARGET_DEFS_ONLY */
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
)
47 tcc_error ("Unknown relocation type: %d", reloc_type
);
51 /* Returns an enumerator to describe wether and when the relocation needs a
52 GOT and/or PLT entry to be created. See tcc.h for a description of the
54 int gotplt_entry_type (int reloc_type
)
63 return NO_GOTPLT_ENTRY
;
67 return AUTO_GOTPLT_ENTRY
;
71 return BUILD_GOT_ONLY
;
76 return ALWAYS_GOTPLT_ENTRY
;
79 tcc_error ("Unknown relocation type: %d", reloc_type
);
83 ST_FUNC
unsigned create_plt_entry(TCCState
*s1
, unsigned got_offset
, struct sym_attr
*attr
)
85 Section
*plt
= s1
->plt
;
88 unsigned plt_offset
, relofs
;
90 /* on i386 if we build a DLL, we add a %ebx offset */
91 if (s1
->output_type
== TCC_OUTPUT_DLL
)
96 /* empty PLT: create PLT0 entry that pushes the library indentifier
97 (GOT + PTR_SIZE) and jumps to ld.so resolution routine
98 (GOT + 2 * PTR_SIZE) */
99 if (plt
->data_offset
== 0) {
100 p
= section_ptr_add(plt
, 16);
101 p
[0] = 0xff; /* pushl got + PTR_SIZE */
103 write32le(p
+ 2, PTR_SIZE
);
104 p
[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
106 write32le(p
+ 8, PTR_SIZE
* 2);
108 plt_offset
= plt
->data_offset
;
110 /* The PLT slot refers to the relocation entry it needs via offset.
111 The reloc entry is created below, so its offset is the current
113 relofs
= s1
->got
->reloc
? s1
->got
->reloc
->data_offset
: 0;
115 /* Jump to GOT entry where ld.so initially put the address of ip + 4 */
116 p
= section_ptr_add(plt
, 16);
117 p
[0] = 0xff; /* jmp *(got + x) */
119 write32le(p
+ 2, got_offset
);
120 p
[6] = 0x68; /* push $xxx */
121 write32le(p
+ 7, relofs
);
122 p
[11] = 0xe9; /* jmp plt_start */
123 write32le(p
+ 12, -(plt
->data_offset
));
127 /* relocate the PLT: compute addresses and offsets in the PLT now that final
128 address for PLT and GOT are known (see fill_program_header) */
129 ST_FUNC
void relocate_plt(TCCState
*s1
)
137 p_end
= p
+ s1
->plt
->data_offset
;
140 add32le(p
+ 2, s1
->got
->sh_addr
);
141 add32le(p
+ 8, s1
->got
->sh_addr
);
144 add32le(p
+ 2, s1
->got
->sh_addr
);
150 static ElfW_Rel
*qrel
; /* ptr to next reloc entry reused */
152 void relocate_init(Section
*sr
)
154 qrel
= (ElfW_Rel
*) sr
->data
;
157 void relocate(TCCState
*s1
, ElfW_Rel
*rel
, int type
, char *ptr
, addr_t addr
, addr_t val
)
159 int sym_index
, esym_index
;
161 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
165 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
166 esym_index
= s1
->sym_attrs
[sym_index
].dyn_index
;
167 qrel
->r_offset
= rel
->r_offset
;
169 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_32
);
173 qrel
->r_info
= ELFW(R_INFO
)(0, R_386_RELATIVE
);
180 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
182 esym_index
= s1
->sym_attrs
[sym_index
].dyn_index
;
184 qrel
->r_offset
= rel
->r_offset
;
185 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_PC32
);
190 add32le(ptr
, val
- addr
);
193 add32le(ptr
, val
- addr
);
200 add32le(ptr
, s1
->got
->sh_addr
- addr
);
203 add32le(ptr
, val
- s1
->got
->sh_addr
);
207 /* we load the got offset */
208 add32le(ptr
, s1
->sym_attrs
[sym_index
].got_offset
);
211 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
) {
213 tcc_error("can only produce 16-bit binary files");
215 write16le(ptr
, read16le(ptr
) + val
);
218 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
)
220 write16le(ptr
, read16le(ptr
) + val
- addr
);
226 /* This reloction must copy initialized data from the library
227 to the program .bss segment. Currently made like for ARM
228 (to remove noise of defaukt case). Is this true?
232 fprintf(stderr
,"FIXME: handle reloc type %d at %x [%p] to %x\n",
233 type
, (unsigned)addr
, ptr
, (unsigned)val
);
238 #endif /* !TARGET_DEFS_ONLY */