mirror of
https://github.com/frida/tinycc
synced 2024-11-24 16:49:44 +03:00
better DLL generation - added size to all ELF symbols - dynamic hash table size
This commit is contained in:
bellard
parent
18e40e1a25
commit
7ac43f6d19
474
tcc.c
474
tcc.c
@ -76,8 +76,6 @@
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#define TOK_HASH_SIZE 2048 /* must be a power of two */
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#define TOK_ALLOC_INCR 512 /* must be a power of two */
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#define SYM_HASH_SIZE 1031
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#define ELF_SYM_HASH_SIZE 2048
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#define ELF_DYNSYM_HASH_SIZE 32
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/* token symbol management */
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typedef struct TokenSym {
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@ -147,6 +145,7 @@ typedef struct Section {
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unsigned long sh_size; /* section size (only used during output) */
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unsigned long sh_addr; /* address at which the section is relocated */
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unsigned long sh_offset; /* address at which the section is relocated */
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int nb_hashed_syms; /* used to resize the hash table */
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struct Section *link; /* link to another section */
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struct Section *reloc; /* corresponding section for relocation, if any */
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struct Section *hash; /* hash table for symbols */
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@ -238,7 +237,7 @@ Section *lbounds_section; /* contains local data bound description */
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/* symbol sections */
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Section *symtab_section, *strtab_section;
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/* temporary dynamic symbol sections (for dll loading) */
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Section *dynsymtab_section, *dynstrtab_section;
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Section *dynsymtab_section;
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/* exported dynamic symbol section */
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Section *dynsym;
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/* got handling */
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@ -246,7 +245,8 @@ Section *got;
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unsigned long *got_offsets;
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int nb_got_offsets;
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int nb_plt_entries;
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/* give the correspondance from symtab indexes to dynsym indexes */
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int *symtab_to_dynsym;
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/* array of all loaded dlls (including those referenced by loaded
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dlls) */
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@ -596,8 +596,9 @@ static Sym *get_sym_ref(int t, Section *sec,
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/* section generation */
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static void *section_ptr(Section *sec, unsigned long size);
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static void *section_ptr_add(Section *sec, unsigned long size);
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void put_extern_sym(Sym *sym, Section *section, unsigned long value);
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void greloc(Section *s, Sym *sym, unsigned long addr, int type);
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static void put_extern_sym(Sym *sym, Section *section,
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unsigned long value, unsigned long size);
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static void greloc(Section *s, Sym *sym, unsigned long addr, int type);
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static int put_elf_str(Section *s, const char *sym);
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static int put_elf_sym(Section *s,
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unsigned long value, unsigned long size,
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@ -822,10 +823,10 @@ Section *find_section(const char *name)
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}
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/* add a new relocation entry to symbol 'sym' in section 's' */
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void greloc(Section *s, Sym *sym, unsigned long offset, int type)
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static void greloc(Section *s, Sym *sym, unsigned long offset, int type)
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{
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if (!sym->c)
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put_extern_sym(sym, NULL, 0);
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put_extern_sym(sym, NULL, 0, 0);
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/* now we can add ELF relocation info */
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put_elf_reloc(symtab_section, s, offset, type, sym->c);
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}
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@ -2536,17 +2537,16 @@ static Sym *get_sym_ref(int t, Section *sec,
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v = anon_sym++;
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sym = sym_push1(&global_stack, v, t | VT_STATIC, 0);
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sym->r = VT_CONST | VT_SYM;
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put_extern_sym(sym, sec, offset);
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put_extern_sym(sym, sec, offset, size);
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return sym;
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}
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/* push a reference to a section offset by adding a dummy symbol */
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/* XXX: add size */
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void vpush_ref(int t, Section *sec, unsigned long offset)
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void vpush_ref(int t, Section *sec, unsigned long offset, unsigned long size)
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{
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CValue cval;
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cval.sym = get_sym_ref(t, sec, offset, 0);
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cval.sym = get_sym_ref(t, sec, offset, size);
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vsetc(t, VT_CONST | VT_SYM, &cval);
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}
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@ -2760,30 +2760,24 @@ int gv(int rc)
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} else {
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if (is_float(vtop->t) &&
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(vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
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int v;
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Sym *sym;
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int *ptr;
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unsigned long offset;
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/* XXX: unify with initializers handling ? */
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/* CPUs usually cannot use float constants, so we store them
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generically in data segment */
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size = type_size(vtop->t, &align);
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data_section->data_offset = (data_section->data_offset +
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align - 1) & -align;
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offset = (data_section->data_offset + align - 1) & -align;
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data_section->data_offset = offset;
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/* XXX: not portable yet */
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ptr = section_ptr(data_section, size);
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ptr = section_ptr_add(data_section, size);
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size = size >> 2;
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for(i=0;i<size;i++)
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ptr[i] = vtop->c.tab[i];
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v = anon_sym++;
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sym = sym_push1(&global_stack, v, vtop->t | VT_STATIC, 0);
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sym->r = VT_CONST | VT_SYM;
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put_extern_sym(sym, data_section, data_section->data_offset);
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sym = get_sym_ref(vtop->t, data_section, offset, size << 2);
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vtop->r |= VT_LVAL | VT_SYM;
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vtop->c.sym = sym;
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data_section->data_offset += size << 2;
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}
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#ifdef CONFIG_TCC_BCHECK
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if (vtop->r & VT_MUSTBOUND)
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@ -4706,7 +4700,7 @@ void unary(void)
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t = VT_ARRAY | mk_pointer(VT_BYTE);
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s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
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s->c = len;
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vpush_ref(t, data_section, data_section->data_offset);
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vpush_ref(t, data_section, data_section->data_offset, len);
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ptr = section_ptr_add(data_section, len);
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memcpy(ptr, funcname, len);
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next();
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@ -4724,9 +4718,9 @@ void unary(void)
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/* we must declare it as an array first to use initializer parser */
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t = VT_ARRAY | mk_pointer(t);
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decl_initializer(t, data_section, data_offset, 1, 0);
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data_offset += type_size(t, &align);
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/* XXX: is it correct to put it exactly as an array ? */
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vpush_ref(t, data_section, fc);
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size = type_size(t, &align);
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data_offset += size;
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vpush_ref(t, data_section, fc, size);
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data_section->data_offset = data_offset;
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} else {
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t = tok;
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@ -5900,12 +5894,12 @@ void decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init,
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do_def:
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sym = sym_push(v, t, r | VT_SYM, 0);
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}
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put_extern_sym(sym, sec, addr);
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put_extern_sym(sym, sec, addr, size);
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} else {
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CValue cval;
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/* push global reference */
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sym = get_sym_ref(t, sec, addr, 0);
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sym = get_sym_ref(t, sec, addr, size);
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cval.sym = sym;
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vsetc(t, VT_CONST | VT_SYM, &cval);
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}
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@ -5942,7 +5936,6 @@ void put_func_debug(Sym *sym)
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funcname, sym->t & VT_STATIC ? 'f' : 'F');
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put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
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cur_text_section, sym->c);
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func_ind = ind;
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last_ind = 0;
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last_line_num = 0;
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}
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@ -6100,7 +6093,9 @@ void decl(int l)
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/* put function symbol */
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sym = sym_push1(&global_stack, v, t, 0);
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}
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put_extern_sym(sym, cur_text_section, ind);
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/* NOTE: we patch the symbol size later */
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put_extern_sym(sym, cur_text_section, ind, 0);
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func_ind = ind;
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sym->r = VT_SYM | VT_CONST;
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/* put debug symbol */
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if (do_debug)
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@ -6121,6 +6116,9 @@ void decl(int l)
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sym_pop(&label_stack, NULL); /* reset label stack */
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sym_pop(&local_stack, NULL); /* reset local stack */
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/* end of function */
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/* patch symbol size */
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((Elf32_Sym *)symtab_section->data)[sym->c].st_size =
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ind - func_ind;
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if (do_debug) {
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put_stabn(N_FUN, 0, 0, ind - func_ind);
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}
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@ -6322,6 +6320,40 @@ static unsigned long elf_hash(const unsigned char *name)
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return h;
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}
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/* rebuild hash table of section s */
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/* NOTE: we do factorize the hash table code to go faster */
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static void rebuild_hash(Section *s, unsigned int nb_buckets)
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{
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Elf32_Sym *sym;
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int *ptr, *hash, nb_syms, sym_index, h;
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char *strtab;
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strtab = s->link->data;
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nb_syms = s->data_offset / sizeof(Elf32_Sym);
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s->hash->data_offset = 0;
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ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int));
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ptr[0] = nb_buckets;
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ptr[1] = nb_syms;
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ptr += 2;
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hash = ptr;
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memset(hash, 0, (nb_buckets + 1) * sizeof(int));
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ptr += nb_buckets + 1;
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sym = (Elf32_Sym *)s->data + 1;
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for(sym_index = 1; sym_index < nb_syms; sym_index++) {
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if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
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h = elf_hash(strtab + sym->st_name) % nb_buckets;
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*ptr = hash[h];
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hash[h] = sym_index;
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} else {
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*ptr = 0;
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}
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ptr++;
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sym++;
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}
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}
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/* return the symbol number */
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static int put_elf_sym(Section *s,
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unsigned long value, unsigned long size,
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@ -6347,20 +6379,26 @@ static int put_elf_sym(Section *s,
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sym_index = sym - (Elf32_Sym *)s->data;
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hs = s->hash;
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if (hs) {
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int *ptr;
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int *ptr, *base;
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ptr = section_ptr_add(hs, sizeof(int));
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base = (int *)hs->data;
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/* only add global or weak symbols */
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if (ELF32_ST_BIND(info) != STB_LOCAL) {
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/* add another hashing entry */
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nbuckets = ((int *)hs->data)[0];
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nbuckets = base[0];
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h = elf_hash(name) % nbuckets;
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*ptr = ((int *)hs->data)[2 + h];
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((int *)hs->data)[2 + h] = sym_index;
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*ptr = base[2 + h];
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base[2 + h] = sym_index;
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base[1]++;
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/* we resize the hash table */
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hs->nb_hashed_syms++;
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if (hs->nb_hashed_syms > 2 * nbuckets) {
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rebuild_hash(s, 2 * nbuckets);
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}
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} else {
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*ptr = 0;
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base[1]++;
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}
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/* but still add room for all symbols */
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((int *)hs->data)[1]++;
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}
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return sym_index;
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}
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@ -6457,7 +6495,8 @@ static int add_elf_sym(Section *s, unsigned long value, unsigned long size,
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/* update sym->c so that it points to an external symbol in section
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'section' with value 'value' */
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void put_extern_sym(Sym *sym, Section *section, unsigned long value)
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static void put_extern_sym(Sym *sym, Section *section,
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unsigned long value, unsigned long size)
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{
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int sym_type, sym_bind, sh_num, info;
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Elf32_Sym *esym;
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@ -6502,10 +6541,11 @@ void put_extern_sym(Sym *sym, Section *section, unsigned long value)
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}
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#endif
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info = ELF32_ST_INFO(sym_bind, sym_type);
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sym->c = add_elf_sym(symtab_section, value, 0, info, sh_num, name);
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sym->c = add_elf_sym(symtab_section, value, size, info, sh_num, name);
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} else {
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esym = &((Elf32_Sym *)symtab_section->data)[sym->c];
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esym->st_value = value;
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esym->st_size = size;
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esym->st_shndx = sh_num;
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}
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}
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@ -6728,50 +6768,20 @@ static void relocate_syms(int do_resolve)
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}
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}
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/* elf relocation, CPU dependant */
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static void elf_reloc(unsigned char *ptr,
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unsigned long addr, unsigned long val, int type,
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int sym_index)
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{
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switch(type) {
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case R_386_32:
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*(int *)ptr += val;
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break;
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case R_386_PLT32:
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case R_386_PC32:
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*(int *)ptr += val - addr;
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break;
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case R_386_GLOB_DAT:
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case R_386_JMP_SLOT:
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*(int *)ptr = val;
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break;
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case R_386_GOTPC:
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*(int *)ptr += got->sh_addr - addr;
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break;
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case R_386_GOTOFF:
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*(int *)ptr += val - got->sh_addr;
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break;
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case R_386_GOT32:
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/* we load the got offset */
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*(int *)ptr += got_offsets[sym_index];
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break;
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}
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}
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/* relocate a given section */
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static void relocate_section(Section *s)
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/* relocate a given section (CPU dependant) */
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static void relocate_section(TCCState *s1, Section *s)
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{
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Section *sr;
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Elf32_Rel *rel, *rel_end;
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Elf32_Rel *rel, *rel_end, *qrel;
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Elf32_Sym *sym;
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int type, sym_index;
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int type, sym_index, esym_index;
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unsigned char *ptr;
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unsigned long val;
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unsigned long val, addr;
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sr = s->reloc;
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rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
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for(rel = (Elf32_Rel *)sr->data;
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qrel = (Elf32_Rel *)sr->data;
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for(rel = qrel;
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rel < rel_end;
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rel++) {
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ptr = s->data + rel->r_offset;
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@ -6780,8 +6790,60 @@ static void relocate_section(Section *s)
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sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
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val = sym->st_value;
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type = ELF32_R_TYPE(rel->r_info);
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elf_reloc(ptr, s->sh_addr + rel->r_offset, val, type, sym_index);
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addr = s->sh_addr + rel->r_offset;
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/* CPU specific */
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switch(type) {
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case R_386_32:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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esym_index = symtab_to_dynsym[sym_index];
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qrel->r_offset = rel->r_offset;
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if (esym_index) {
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qrel->r_info = ELF32_R_INFO(esym_index, R_386_32);
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qrel++;
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break;
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} else {
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qrel->r_info = ELF32_R_INFO(0, R_386_RELATIVE);
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qrel++;
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}
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}
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*(int *)ptr += val;
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break;
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case R_386_PC32:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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/* DLL relocation */
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esym_index = symtab_to_dynsym[sym_index];
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if (esym_index) {
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qrel->r_offset = rel->r_offset;
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qrel->r_info = ELF32_R_INFO(esym_index, R_386_PC32);
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qrel++;
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break;
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}
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}
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*(int *)ptr += val - addr;
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break;
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case R_386_PLT32:
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*(int *)ptr += val - addr;
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break;
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case R_386_GLOB_DAT:
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case R_386_JMP_SLOT:
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*(int *)ptr = val;
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break;
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case R_386_GOTPC:
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*(int *)ptr += got->sh_addr - addr;
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break;
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case R_386_GOTOFF:
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*(int *)ptr += val - got->sh_addr;
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break;
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case R_386_GOT32:
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/* we load the got offset */
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*(int *)ptr += got_offsets[sym_index];
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break;
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}
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}
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/* if the relocation is allocated, we change its symbol table */
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if (sr->sh_flags & SHF_ALLOC)
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sr->link = dynsym;
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}
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/* relocate relocation table in 'sr' */
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@ -6799,6 +6861,39 @@ static void relocate_rel(Section *sr)
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}
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}
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/* count the number of dynamic relocations so that we can reserve
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their space */
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static int prepare_dynamic_rel(Section *sr)
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{
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Elf32_Rel *rel, *rel_end;
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int sym_index, esym_index, type, count;
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count = 0;
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rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
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for(rel = (Elf32_Rel *)sr->data; rel < rel_end; rel++) {
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sym_index = ELF32_R_SYM(rel->r_info);
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type = ELF32_R_TYPE(rel->r_info);
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switch(type) {
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case R_386_32:
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count++;
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break;
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case R_386_PC32:
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esym_index = symtab_to_dynsym[sym_index];
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if (esym_index)
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count++;
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break;
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default:
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break;
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}
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}
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if (count) {
|
||||
/* allocate the section */
|
||||
sr->sh_flags |= SHF_ALLOC;
|
||||
sr->sh_size = count * sizeof(Elf32_Rel);
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static void put_got_offset(int index, unsigned long val)
|
||||
{
|
||||
int n;
|
||||
@ -6934,18 +7029,32 @@ static void build_got_entries(void)
|
||||
}
|
||||
}
|
||||
|
||||
static Section *new_section_hash(const char *name, int sh_flags,
|
||||
int nb_buckets, Section *symtab)
|
||||
static Section *new_symtab(const char *symtab_name, int sh_type, int sh_flags,
|
||||
const char *strtab_name,
|
||||
const char *hash_name, int hash_sh_flags)
|
||||
{
|
||||
Section *hash;
|
||||
hash = new_section(name, SHT_HASH, sh_flags);
|
||||
((int *)hash->data)[0] = nb_buckets;
|
||||
((int *)hash->data)[1] = 1;
|
||||
Section *symtab, *strtab, *hash;
|
||||
int *ptr, nb_buckets;
|
||||
|
||||
symtab = new_section(symtab_name, sh_type, sh_flags);
|
||||
symtab->sh_entsize = sizeof(Elf32_Sym);
|
||||
strtab = new_section(strtab_name, SHT_STRTAB, sh_flags);
|
||||
put_elf_str(strtab, "");
|
||||
symtab->link = strtab;
|
||||
put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL);
|
||||
|
||||
nb_buckets = 1;
|
||||
|
||||
hash = new_section(hash_name, SHT_HASH, hash_sh_flags);
|
||||
hash->sh_entsize = sizeof(int);
|
||||
section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
|
||||
symtab->hash = hash;
|
||||
hash->link = symtab;
|
||||
return hash;
|
||||
|
||||
ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
|
||||
ptr[0] = nb_buckets;
|
||||
ptr[1] = 1;
|
||||
memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int));
|
||||
return symtab;
|
||||
}
|
||||
|
||||
/* put dynamic tag */
|
||||
@ -7055,7 +7164,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
Section *strsec, *s;
|
||||
Elf32_Shdr shdr, *sh;
|
||||
Elf32_Phdr *phdr, *ph;
|
||||
Section *interp, *plt, *dynamic, *dynstr, *hash;
|
||||
Section *interp, *plt, *dynamic, *dynstr;
|
||||
unsigned long saved_dynamic_data_offset;
|
||||
Elf32_Sym *sym;
|
||||
int type, file_type;
|
||||
@ -7072,7 +7181,6 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
got = NULL;
|
||||
nb_plt_entries = 0;
|
||||
plt = NULL; /* avoid warning */
|
||||
hash = NULL; /* avoid warning */
|
||||
dynstr = NULL; /* avoid warning */
|
||||
saved_dynamic_data_offset = 0; /* avoid warning */
|
||||
|
||||
@ -7095,16 +7203,10 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
}
|
||||
|
||||
/* add dynamic symbol table */
|
||||
dynsym = new_section(".dynsym", SHT_DYNSYM, SHF_ALLOC);
|
||||
dynsym->sh_entsize = sizeof(Elf32_Sym);
|
||||
dynstr = new_section(".dynstr", SHT_STRTAB, SHF_ALLOC);
|
||||
put_elf_str(dynstr, "");
|
||||
dynsym->link = dynstr;
|
||||
put_elf_sym(dynsym, 0, 0, 0, 0, 0, NULL);
|
||||
|
||||
/* hash table */
|
||||
hash = new_section_hash(".hash", SHF_ALLOC,
|
||||
ELF_DYNSYM_HASH_SIZE, dynsym);
|
||||
dynsym = new_symtab(".dynsym", SHT_DYNSYM, SHF_ALLOC,
|
||||
".dynstr",
|
||||
".hash", SHF_ALLOC);
|
||||
dynstr = dynsym->link;
|
||||
|
||||
/* add dynamic section */
|
||||
dynamic = new_section(".dynamic", SHT_DYNAMIC,
|
||||
@ -7116,70 +7218,96 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
plt = new_section(".plt", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
|
||||
plt->sh_entsize = 4;
|
||||
|
||||
build_got();
|
||||
|
||||
/* scan for undefined symbols and see if they are in the
|
||||
dynamic symbols. If a symbol STT_FUNC is found, then we
|
||||
add it in the PLT. If a symbol STT_OBJECT is found, we
|
||||
add it in the .bss section with a suitable relocation */
|
||||
sym_end = (Elf32_Sym *)(symtab_section->data +
|
||||
symtab_section->data_offset);
|
||||
for(sym = (Elf32_Sym *)symtab_section->data + 1;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
name = symtab_section->link->data + sym->st_name;
|
||||
sym_index = find_elf_sym(dynsymtab_section, name);
|
||||
if (sym_index) {
|
||||
esym = &((Elf32_Sym *)dynsymtab_section->data)[sym_index];
|
||||
type = ELF32_ST_TYPE(esym->st_info);
|
||||
if (type == STT_FUNC) {
|
||||
put_got_entry(R_386_JMP_SLOT, esym->st_size,
|
||||
esym->st_info,
|
||||
sym - (Elf32_Sym *)symtab_section->data);
|
||||
} else if (type == STT_OBJECT) {
|
||||
unsigned long offset;
|
||||
offset = bss_section->data_offset;
|
||||
/* XXX: which alignment ? */
|
||||
offset = (offset + 8 - 1) & -8;
|
||||
index = put_elf_sym(dynsym, offset, esym->st_size,
|
||||
esym->st_info, 0,
|
||||
bss_section->sh_num, name);
|
||||
put_elf_reloc(dynsym, bss_section,
|
||||
offset, R_386_COPY, index);
|
||||
offset += esym->st_size;
|
||||
bss_section->data_offset = offset;
|
||||
}
|
||||
} else {
|
||||
/* STB_WEAK undefined symbols are accepted */
|
||||
/* XXX: _fp_hw seems to be part of the ABI, so we ignore
|
||||
it */
|
||||
if (ELF32_ST_BIND(sym->st_info) == STB_WEAK ||
|
||||
!strcmp(name, "_fp_hw")) {
|
||||
if (file_type == TCC_OUTPUT_EXE) {
|
||||
for(sym = (Elf32_Sym *)symtab_section->data + 1;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
name = symtab_section->link->data + sym->st_name;
|
||||
sym_index = find_elf_sym(dynsymtab_section, name);
|
||||
if (sym_index) {
|
||||
esym = &((Elf32_Sym *)dynsymtab_section->data)[sym_index];
|
||||
type = ELF32_ST_TYPE(esym->st_info);
|
||||
if (type == STT_FUNC) {
|
||||
put_got_entry(R_386_JMP_SLOT, esym->st_size,
|
||||
esym->st_info,
|
||||
sym - (Elf32_Sym *)symtab_section->data);
|
||||
} else if (type == STT_OBJECT) {
|
||||
unsigned long offset;
|
||||
offset = bss_section->data_offset;
|
||||
/* XXX: which alignment ? */
|
||||
offset = (offset + 8 - 1) & -8;
|
||||
index = put_elf_sym(dynsym, offset, esym->st_size,
|
||||
esym->st_info, 0,
|
||||
bss_section->sh_num, name);
|
||||
put_elf_reloc(dynsym, bss_section,
|
||||
offset, R_386_COPY, index);
|
||||
offset += esym->st_size;
|
||||
bss_section->data_offset = offset;
|
||||
}
|
||||
} else {
|
||||
error("undefined symbol '%s'", name);
|
||||
/* STB_WEAK undefined symbols are accepted */
|
||||
/* XXX: _fp_hw seems to be part of the ABI, so we ignore
|
||||
it */
|
||||
if (ELF32_ST_BIND(sym->st_info) == STB_WEAK ||
|
||||
!strcmp(name, "_fp_hw")) {
|
||||
} else {
|
||||
error("undefined symbol '%s'", name);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* now look at unresolved dynamic symbols and export
|
||||
corresponding symbol */
|
||||
sym_end = (Elf32_Sym *)(dynsymtab_section->data +
|
||||
dynsymtab_section->data_offset);
|
||||
for(sym = (Elf32_Sym *)dynsymtab_section->data + 1;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
name = dynsymtab_section->link->data + sym->st_name;
|
||||
sym_index = find_elf_sym(symtab_section, name);
|
||||
if (sym_index) {
|
||||
} else {
|
||||
if (ELF32_ST_BIND(sym->st_info) == STB_WEAK) {
|
||||
/* weak symbols can stay undefined */
|
||||
/* now look at unresolved dynamic symbols and export
|
||||
corresponding symbol */
|
||||
sym_end = (Elf32_Sym *)(dynsymtab_section->data +
|
||||
dynsymtab_section->data_offset);
|
||||
for(esym = (Elf32_Sym *)dynsymtab_section->data + 1;
|
||||
esym < sym_end;
|
||||
esym++) {
|
||||
if (esym->st_shndx == SHN_UNDEF) {
|
||||
name = dynsymtab_section->link->data + esym->st_name;
|
||||
sym_index = find_elf_sym(symtab_section, name);
|
||||
if (sym_index) {
|
||||
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
|
||||
put_elf_sym(dynsym, sym->st_value, sym->st_size,
|
||||
sym->st_info, 0,
|
||||
sym->st_shndx, name);
|
||||
} else {
|
||||
warning("undefined dynamic symbol '%s'", name);
|
||||
if (ELF32_ST_BIND(esym->st_info) == STB_WEAK) {
|
||||
/* weak symbols can stay undefined */
|
||||
} else {
|
||||
warning("undefined dynamic symbol '%s'", name);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
} else {
|
||||
int nb_syms;
|
||||
/* shared library case : we simply export all the global symbols */
|
||||
nb_syms = symtab_section->data_offset / sizeof(Elf32_Sym);
|
||||
symtab_to_dynsym = malloc(sizeof(int) * nb_syms);
|
||||
memset(symtab_to_dynsym, 0, sizeof(int) * nb_syms);
|
||||
for(sym = (Elf32_Sym *)symtab_section->data + 1;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
|
||||
name = symtab_section->link->data + sym->st_name;
|
||||
index = put_elf_sym(dynsym, sym->st_value, sym->st_size,
|
||||
sym->st_info, 0,
|
||||
sym->st_shndx, name);
|
||||
symtab_to_dynsym[sym - (Elf32_Sym *)symtab_section->data] =
|
||||
index;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
build_got_entries();
|
||||
@ -7193,6 +7321,10 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
if (dllref->level == 0)
|
||||
put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
|
||||
}
|
||||
/* XXX: currently, since we do not handle PIC code, we
|
||||
must relocate the readonly segments */
|
||||
if (file_type == TCC_OUTPUT_DLL)
|
||||
put_dt(dynamic, DT_TEXTREL, 0);
|
||||
|
||||
/* add necessary space for other entries */
|
||||
saved_dynamic_data_offset = dynamic->data_offset;
|
||||
@ -7243,11 +7375,17 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
s->sh_name = put_elf_str(strsec, s->name);
|
||||
/* we output all sections if debug or object file */
|
||||
if (do_debug ||
|
||||
/* when generating a DLL, we include relocations but we may
|
||||
patch them */
|
||||
if (file_type == TCC_OUTPUT_DLL &&
|
||||
s->sh_type == SHT_REL &&
|
||||
!(s->sh_flags & SHF_ALLOC)) {
|
||||
prepare_dynamic_rel(s);
|
||||
} else if (do_debug ||
|
||||
file_type == TCC_OUTPUT_OBJ ||
|
||||
(s->sh_flags & SHF_ALLOC) ||
|
||||
i == (nb_sections - 1)) {
|
||||
/* we output all sections if debug or object file */
|
||||
s->sh_size = s->data_offset;
|
||||
}
|
||||
}
|
||||
@ -7430,7 +7568,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
/* put dynamic section entries */
|
||||
|
||||
dynamic->data_offset = saved_dynamic_data_offset;
|
||||
put_dt(dynamic, DT_HASH, hash->sh_addr);
|
||||
put_dt(dynamic, DT_HASH, dynsym->hash->sh_addr);
|
||||
put_dt(dynamic, DT_STRTAB, dynstr->sh_addr);
|
||||
put_dt(dynamic, DT_SYMTAB, dynsym->sh_addr);
|
||||
put_dt(dynamic, DT_STRSZ, dynstr->data_offset);
|
||||
@ -7470,7 +7608,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
if (s->reloc && s != got)
|
||||
relocate_section(s);
|
||||
relocate_section(s1, s);
|
||||
}
|
||||
|
||||
/* relocate relocation entries if the relocation tables are
|
||||
@ -7484,7 +7622,10 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
}
|
||||
|
||||
/* get entry point address */
|
||||
ehdr.e_entry = get_elf_sym_val("_start");
|
||||
if (file_type == TCC_OUTPUT_EXE)
|
||||
ehdr.e_entry = get_elf_sym_val("_start");
|
||||
else
|
||||
ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
|
||||
}
|
||||
|
||||
sort_syms(symtab_section);
|
||||
@ -8208,7 +8349,7 @@ int tcc_run(TCCState *s1, int argc, char **argv)
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
if (s->reloc)
|
||||
relocate_section(s);
|
||||
relocate_section(s1, s);
|
||||
}
|
||||
|
||||
prog_main = (void *)get_elf_sym_val("main");
|
||||
@ -8288,24 +8429,15 @@ TCCState *tcc_new(void)
|
||||
bss_section = new_section(".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
|
||||
|
||||
/* symbols are always generated for linking stage */
|
||||
symtab_section = new_section(".symtab", SHT_SYMTAB, 0);
|
||||
symtab_section->sh_entsize = sizeof(Elf32_Sym);
|
||||
strtab_section = new_section(".strtab", SHT_STRTAB, 0);
|
||||
put_elf_str(strtab_section, "");
|
||||
symtab_section->link = strtab_section;
|
||||
put_elf_sym(symtab_section, 0, 0, 0, 0, 0, NULL);
|
||||
new_section_hash(".hashtab", SHF_PRIVATE,
|
||||
ELF_SYM_HASH_SIZE, symtab_section);
|
||||
symtab_section = new_symtab(".symtab", SHT_SYMTAB, 0,
|
||||
".strtab",
|
||||
".hashtab", SHF_PRIVATE);
|
||||
strtab_section = symtab_section->link;
|
||||
|
||||
/* private symbol table for dynamic symbols */
|
||||
dynsymtab_section = new_section(".dynsymtab", SHT_SYMTAB, SHF_PRIVATE);
|
||||
dynsymtab_section->sh_entsize = sizeof(Elf32_Sym);
|
||||
dynstrtab_section = new_section(".dynstrtab", SHT_STRTAB, SHF_PRIVATE);
|
||||
put_elf_str(dynstrtab_section, "");
|
||||
dynsymtab_section->link = dynstrtab_section;
|
||||
put_elf_sym(dynsymtab_section, 0, 0, 0, 0, 0, NULL);
|
||||
new_section_hash(".dynhashtab", SHF_PRIVATE,
|
||||
ELF_SYM_HASH_SIZE, dynsymtab_section);
|
||||
dynsymtab_section = new_symtab(".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
|
||||
".dynstrtab",
|
||||
".dynhashtab", SHF_PRIVATE);
|
||||
return s;
|
||||
}
|
||||
|
||||
@ -8504,7 +8636,7 @@ int tcc_set_output_type(TCCState *s, int output_type)
|
||||
|
||||
void help(void)
|
||||
{
|
||||
printf("tcc version 0.9.8 - Tiny C Compiler - Copyright (C) 2001, 2002 Fabrice Bellard\n"
|
||||
printf("tcc version 0.9.9 - Tiny C Compiler - Copyright (C) 2001, 2002 Fabrice Bellard\n"
|
||||
"usage: tcc [-c] [-o outfile] [-Bdir] [-bench] [-Idir] [-Dsym[=val]] [-Usym]\n"
|
||||
" [-g] [-b] [-Ldir] [-llib] [-shared] [-static]\n"
|
||||
" [--] infile1 [infile2... --] [infile_args...]\n"
|
||||
@ -8528,7 +8660,7 @@ void help(void)
|
||||
"Linker options:\n"
|
||||
" -Ldir add library path 'dir'\n"
|
||||
" -llib link with dynamic library 'lib'\n"
|
||||
" -shared generate a shared library (NOT WORKING YET)\n"
|
||||
" -shared generate a shared library\n"
|
||||
" -static static linking\n"
|
||||
);
|
||||
}
|
||||
@ -8619,8 +8751,6 @@ int main(int argc, char **argv)
|
||||
output_type = TCC_OUTPUT_EXE;
|
||||
|
||||
/* warning if not supported features */
|
||||
if (output_type == TCC_OUTPUT_DLL)
|
||||
warning("dll output is currently not supported");
|
||||
#ifdef CONFIG_TCC_BCHECK
|
||||
if (do_bounds_check && output_type != TCC_OUTPUT_MEMORY)
|
||||
warning("bounds checking is currently only supported for in-memory execution");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user