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
11 #define R_RELATIVE R_386_RELATIVE
13 #define R_NUM R_386_NUM
15 #define ELF_START_ADDR 0x08048000
16 #define ELF_PAGE_SIZE 0x1000
18 #define PCRELATIVE_DLLPLT 0
19 #define RELOCATE_DLLPLT 0
21 #else /* !TARGET_DEFS_ONLY */
26 /* Returns 1 for a code relocation, 0 for a data relocation. For unknown
27 relocations, returns -1. */
28 int code_reloc (int reloc_type
)
51 /* Returns an enumerator to describe whether 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
)
62 return NO_GOTPLT_ENTRY
;
65 /* This relocations shouldn't normally need GOT or PLT
66 slots if it weren't for simplicity in the code generator.
67 See our caller for comments. */
68 return AUTO_GOTPLT_ENTRY
;
72 return AUTO_GOTPLT_ENTRY
;
76 return BUILD_GOT_ONLY
;
81 return ALWAYS_GOTPLT_ENTRY
;
86 ST_FUNC
unsigned create_plt_entry(TCCState
*s1
, unsigned got_offset
, struct sym_attr
*attr
)
88 Section
*plt
= s1
->plt
;
91 unsigned plt_offset
, relofs
;
93 /* on i386 if we build a DLL, we add a %ebx offset */
94 if (s1
->output_type
== TCC_OUTPUT_DLL
)
99 /* empty PLT: create PLT0 entry that pushes the library identifier
100 (GOT + PTR_SIZE) and jumps to ld.so resolution routine
101 (GOT + 2 * PTR_SIZE) */
102 if (plt
->data_offset
== 0) {
103 p
= section_ptr_add(plt
, 16);
104 p
[0] = 0xff; /* pushl got + PTR_SIZE */
106 write32le(p
+ 2, PTR_SIZE
);
107 p
[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
109 write32le(p
+ 8, PTR_SIZE
* 2);
111 plt_offset
= plt
->data_offset
;
113 /* The PLT slot refers to the relocation entry it needs via offset.
114 The reloc entry is created below, so its offset is the current
116 relofs
= s1
->got
->reloc
? s1
->got
->reloc
->data_offset
: 0;
118 /* Jump to GOT entry where ld.so initially put the address of ip + 4 */
119 p
= section_ptr_add(plt
, 16);
120 p
[0] = 0xff; /* jmp *(got + x) */
122 write32le(p
+ 2, got_offset
);
123 p
[6] = 0x68; /* push $xxx */
124 write32le(p
+ 7, relofs
);
125 p
[11] = 0xe9; /* jmp plt_start */
126 write32le(p
+ 12, -(plt
->data_offset
));
130 /* relocate the PLT: compute addresses and offsets in the PLT now that final
131 address for PLT and GOT are known (see fill_program_header) */
132 ST_FUNC
void relocate_plt(TCCState
*s1
)
140 p_end
= p
+ s1
->plt
->data_offset
;
143 add32le(p
+ 2, s1
->got
->sh_addr
);
144 add32le(p
+ 8, s1
->got
->sh_addr
);
147 add32le(p
+ 2, s1
->got
->sh_addr
);
154 void relocate(TCCState
*s1
, ElfW_Rel
*rel
, int type
, unsigned char *ptr
, addr_t addr
, addr_t val
)
156 int sym_index
, esym_index
;
158 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
162 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
163 esym_index
= get_sym_attr(s1
, sym_index
, 0)->dyn_index
;
164 qrel
->r_offset
= rel
->r_offset
;
166 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_32
);
170 qrel
->r_info
= ELFW(R_INFO
)(0, R_386_RELATIVE
);
177 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
179 esym_index
= get_sym_attr(s1
, sym_index
, 0)->dyn_index
;
181 qrel
->r_offset
= rel
->r_offset
;
182 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_PC32
);
187 add32le(ptr
, val
- addr
);
190 add32le(ptr
, val
- addr
);
197 add32le(ptr
, s1
->got
->sh_addr
- addr
);
200 add32le(ptr
, val
- s1
->got
->sh_addr
);
204 /* we load the got offset */
205 add32le(ptr
, get_sym_attr(s1
, sym_index
, 0)->got_offset
);
208 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
) {
210 tcc_error("can only produce 16-bit binary files");
212 write16le(ptr
, read16le(ptr
) + val
);
215 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
)
217 write16le(ptr
, read16le(ptr
) + val
- addr
);
221 add32le(ptr
, val
- s1
->pe_imagebase
);
226 /* This relocation must copy initialized data from the library
227 to the program .bss segment. Currently made like for ARM
228 (to remove noise of default 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 */