mirror of
https://github.com/frida/tinycc
synced 2024-12-25 06:26:49 +03:00
use data_offset in sections instead of pointer to ease section reallocation - relocated .stabs and .bounds sections - fixed char constants casts - fixed implicit cast to unary plus - fixed type for string constants
This commit is contained in:
bellard
parent
540cd6fde7
commit
9b48237795
376
tcc.c
376
tcc.c
@ -135,8 +135,8 @@ typedef struct SymStack {
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#define SHF_PRIVATE 0x80000000
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typedef struct Section {
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unsigned char *data; /* section data */
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unsigned char *data_ptr; /* current data pointer */
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unsigned long data_offset; /* current data offset */
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unsigned char *data; /* section data */
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int sh_name; /* elf section name (only used during output) */
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int sh_num; /* elf section number */
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int sh_type; /* elf section type */
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@ -197,7 +197,7 @@ typedef struct BufferedFile {
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unsigned char *buf_end;
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int fd;
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int line_num; /* current line number - here to simply code */
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char filename[1024]; /* current filename - here to simply code */
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char filename[1024]; /* current filename - here to simplify code */
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unsigned char buffer[IO_BUF_SIZE + 1]; /* extra size for CH_EOB char */
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} BufferedFile;
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@ -337,7 +337,7 @@ struct TCCState {
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#define VT_LVAL_TYPE (VT_LVAL_BYTE | VT_LVAL_SHORT | VT_LVAL_UNSIGNED)
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/* types */
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#define VT_STRUCT_SHIFT 16 /* structure/enum name shift (16 bits left) */
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#define VT_STRUCT_SHIFT 12 /* structure/enum name shift (20 bits left) */
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#define VT_INT 0 /* integer type */
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#define VT_BYTE 1 /* signed byte type */
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@ -594,6 +594,8 @@ static Sym *get_sym_ref(int t, Section *sec,
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unsigned long offset, unsigned long size);
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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 int put_elf_str(Section *s, const char *sym);
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@ -602,7 +604,10 @@ static int put_elf_sym(Section *s,
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int info, int other, int shndx, const char *name);
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static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
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int type, int symbol);
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static void put_stabs(const char *str, int type, int other, int desc, int value);
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static void put_stabs(const char *str, int type, int other, int desc,
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unsigned long value);
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static void put_stabs_r(const char *str, int type, int other, int desc,
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unsigned long value, Section *sec, int sym_index);
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static void put_stabn(int type, int other, int desc, int value);
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static void put_stabd(int type, int other, int desc);
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static int tcc_add_dll(TCCState *s, const char *filename, int flags);
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@ -777,7 +782,7 @@ Section *new_section(const char *name, int sh_type, int sh_flags)
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error("could not mmap section '%s'", name);
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#endif
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sec->data = data;
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sec->data_ptr = data;
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sec->data_offset = 0;
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/* only add section if not private */
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if (!(sh_flags & SHF_PRIVATE)) {
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@ -787,6 +792,20 @@ Section *new_section(const char *name, int sh_type, int sh_flags)
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return sec;
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}
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/* reserve at least 'size' bytes in section 'sec' from sec->data_offset */
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static void *section_ptr(Section *sec, unsigned long size)
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{
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return sec->data + sec->data_offset;
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}
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static void *section_ptr_add(Section *sec, unsigned long size)
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{
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void *ptr;
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ptr = sec->data + sec->data_offset;
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sec->data_offset += size;
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return ptr;
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}
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/* return a reference to a section, and create it if it does not
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exists */
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Section *find_section(const char *name)
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@ -1668,7 +1687,7 @@ void preprocess(void)
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}
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/* read a number in base b */
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int getn(b)
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static int getn(int b)
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{
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int n, t;
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n = 0;
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@ -1690,7 +1709,7 @@ int getn(b)
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}
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/* read a character for string or char constant and eval escape codes */
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int getq()
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static int getq(void)
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{
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int c;
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@ -2094,7 +2113,11 @@ void next_nomacro1(void)
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tok = TOK_CCHAR;
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char_const:
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minp();
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tokc.i = getq();
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b = getq();
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/* this cast is needed if >= 128 */
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if (tok == TOK_CCHAR)
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b = (char)b;
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tokc.i = b;
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if (ch != '\'')
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expect("\'");
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minp();
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@ -2718,7 +2741,7 @@ void gbound(void)
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register value (such as structures). */
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int gv(int rc)
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{
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int r, r2, rc2, bit_pos, bit_size, size, align, i, data_offset;
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int r, r2, rc2, bit_pos, bit_size, size, align, i;
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unsigned long long ll;
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/* NOTE: get_reg can modify vstack[] */
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@ -2739,27 +2762,28 @@ int gv(int rc)
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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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/* 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_offset = data_section->data_ptr - data_section->data;
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data_offset = (data_offset + align - 1) & -align;
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data_section->data_offset = (data_section->data_offset +
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align - 1) & -align;
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/* XXX: not portable yet */
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ptr = section_ptr(data_section, size);
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size = size >> 2;
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for(i=0;i<size;i++)
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((int *)(data_section->data + data_offset))[i] = vtop->c.tab[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_offset);
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put_extern_sym(sym, data_section, data_section->data_offset);
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vtop->r |= VT_LVAL | VT_SYM;
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vtop->c.sym = sym;
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data_offset += size << 2;
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data_section->data_ptr = data_section->data + data_offset;
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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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@ -4673,13 +4697,18 @@ void unary(void)
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vsetc(VT_LDOUBLE, VT_CONST, &tokc);
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next();
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} else if (tok == TOK___FUNC__) {
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void *ptr;
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int len;
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/* special function name identifier */
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/* generate (char *) type */
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data_offset = data_section->data_ptr - data_section->data;
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vpush_ref(mk_pointer(VT_BYTE), data_section, data_offset);
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strcpy(data_section->data + data_offset, funcname);
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data_offset += strlen(funcname) + 1;
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data_section->data_ptr = data_section->data + data_offset;
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len = strlen(funcname) + 1;
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/* generate char[len] type */
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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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ptr = section_ptr_add(data_section, len);
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memcpy(ptr, funcname, len);
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next();
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} else if (tok == TOK_LSTR) {
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t = VT_INT;
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@ -4689,16 +4718,16 @@ void unary(void)
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t = VT_BYTE;
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str_init:
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type_size(t, &align);
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data_offset = data_section->data_ptr - data_section->data;
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data_offset = data_section->data_offset;
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data_offset = (data_offset + align - 1) & -align;
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fc = data_offset;
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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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/* put it as pointer */
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vpush_ref(t & ~VT_ARRAY, data_section, fc);
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data_section->data_ptr = data_section->data + data_offset;
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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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data_section->data_offset = data_offset;
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} else {
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t = tok;
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next();
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@ -4758,7 +4787,12 @@ void unary(void)
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gen_op('^');
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} else
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if (t == '+') {
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/* in order to force cast, we add zero */
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unary();
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if ((vtop->t & VT_BTYPE) == VT_PTR)
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error("pointer not accepted for unary plus");
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vpushi(0);
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gen_op('+');
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} else
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if (t == TOK_SIZEOF) {
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if (tok == '(') {
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@ -5811,14 +5845,13 @@ void decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init,
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/* XXX: currently, since we do only one pass, we cannot track
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'&' operators, so we add only arrays */
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if (do_bounds_check && (t & VT_ARRAY)) {
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int *bounds_ptr;
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unsigned long *bounds_ptr;
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/* add padding between regions */
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loc--;
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/* then add local bound info */
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bounds_ptr = (int *)lbounds_section->data_ptr;
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*bounds_ptr++ = addr;
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*bounds_ptr++ = size;
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lbounds_section->data_ptr = (unsigned char *)bounds_ptr;
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bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
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bounds_ptr[0] = addr;
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bounds_ptr[1] = size;
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}
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} else {
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/* compute section */
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@ -5829,33 +5862,29 @@ void decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init,
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else
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sec = bss_section;
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}
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data_offset = sec->data_ptr - sec->data;
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data_offset = sec->data_offset;
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data_offset = (data_offset + align - 1) & -align;
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addr = data_offset;
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/* very important to increment global pointer at this time
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because initializers themselves can create new initializers */
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data_offset += size;
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/* handles bounds */
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if (do_bounds_check) {
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int *bounds_ptr;
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/* first, we need to add at least one byte between each region */
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/* add padding if bound check */
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if (do_bounds_check)
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data_offset++;
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/* then add global bound info */
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bounds_ptr = (int *)bounds_section->data_ptr;
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/* XXX: add relocation */
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*bounds_ptr++ = addr + (unsigned long)sec->data;
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*bounds_ptr++ = size;
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bounds_section->data_ptr = (unsigned char *)bounds_ptr;
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}
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sec->data_ptr = sec->data + data_offset;
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sec->data_offset = data_offset;
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}
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if (v) {
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Sym *sym;
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if (!sec) {
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if (!sec) {
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if (v) {
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/* local variable */
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sym_push(v, t, r, addr);
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} else {
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/* push local reference */
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vset(t, r, addr);
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}
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} else {
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Sym *sym;
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if (v) {
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if (scope == VT_CONST) {
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/* global scope: see if already defined */
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sym = sym_find(v);
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@ -5872,14 +5901,25 @@ void decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init,
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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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}
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} else {
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if (!sec) {
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/* push local reference */
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vset(t, r, addr);
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} else {
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CValue cval;
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/* push global reference */
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vpush_ref(t, sec, addr);
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sym = get_sym_ref(t, sec, addr, 0);
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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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/* handles bounds now because the symbol must be defined
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before for the relocation */
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if (do_bounds_check) {
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unsigned long *bounds_ptr;
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greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_32);
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/* then add global bound info */
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bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
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bounds_ptr[0] = 0; /* relocated */
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bounds_ptr[1] = size;
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}
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}
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if (has_init) {
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@ -5892,15 +5932,16 @@ void decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init,
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}
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}
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void put_func_debug(int t)
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void put_func_debug(Sym *sym)
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{
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char buf[512];
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/* stabs info */
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/* XXX: we put here a dummy type */
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snprintf(buf, sizeof(buf), "%s:%c1",
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funcname, t & VT_STATIC ? 'f' : 'F');
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put_stabs(buf, N_FUN, 0, file->line_num, ind);
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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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@ -6049,7 +6090,7 @@ void decl(int l)
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cur_text_section = ad.section;
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if (!cur_text_section)
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cur_text_section = text_section;
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ind = (int)cur_text_section->data_ptr;
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ind = cur_text_section->data_offset;
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funcname = get_tok_str(v, NULL);
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sym = sym_find(v);
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if (sym) {
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@ -6059,12 +6100,11 @@ 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,
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ind - (int)cur_text_section->data);
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put_extern_sym(sym, cur_text_section, 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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put_func_debug(t);
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put_func_debug(sym);
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/* push a dummy symbol to enable local sym storage */
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sym_push1(&local_stack, 0, 0, 0);
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gfunc_prolog(t);
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@ -6077,7 +6117,7 @@ void decl(int l)
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block(NULL, NULL, NULL, NULL, 0);
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gsym(rsym);
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gfunc_epilog();
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cur_text_section->data_ptr = (unsigned char *)ind;
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cur_text_section->data_offset = ind;
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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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@ -6136,7 +6176,7 @@ static int tcc_compile(TCCState *s)
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{
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Sym *define_start;
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char buf[512];
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int p;
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int p, section_sym;
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funcname = "";
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include_stack_ptr = include_stack;
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@ -6146,12 +6186,17 @@ static int tcc_compile(TCCState *s)
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anon_sym = SYM_FIRST_ANOM;
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/* file info: full path + filename */
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section_sym = 0; /* avoid warning */
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if (do_debug) {
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section_sym = put_elf_sym(symtab_section, 0, 0,
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ELF32_ST_INFO(STB_LOCAL, STT_SECTION), 0,
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text_section->sh_num, NULL);
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getcwd(buf, sizeof(buf));
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pstrcat(buf, sizeof(buf), "/");
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put_stabs(buf, N_SO, 0, 0, (unsigned long)text_section->data_ptr);
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put_stabs(file->filename, N_SO, 0, 0,
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(unsigned long)text_section->data_ptr);
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put_stabs_r(buf, N_SO, 0, 0,
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text_section->data_offset, text_section, section_sym);
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put_stabs_r(file->filename, N_SO, 0, 0,
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text_section->data_offset, text_section, section_sym);
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}
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/* an elf symbol of type STT_FILE must be put so that STB_LOCAL
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symbols can be safely used */
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@ -6177,7 +6222,8 @@ static int tcc_compile(TCCState *s)
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/* end of translation unit info */
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if (do_debug) {
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put_stabn(N_SO, 0, 0, (unsigned long)text_section->data_ptr);
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put_stabs_r(NULL, N_SO, 0, 0,
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text_section->data_offset, text_section, section_sym);
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}
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/* reset define stack, but leave -Dsymbols (may be incorrect if
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@ -6251,14 +6297,13 @@ void tcc_undefine_symbol(TCCState *s1, const char *sym)
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static int put_elf_str(Section *s, const char *sym)
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{
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int c, offset;
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offset = s->data_ptr - s->data;
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for(;;) {
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c = *sym++;
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*s->data_ptr++ = c;
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if (c == '\0')
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break;
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}
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int offset, len;
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char *ptr;
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len = strlen(sym) + 1;
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offset = s->data_offset;
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ptr = section_ptr_add(s, len);
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memcpy(ptr, sym, len);
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return offset;
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}
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@ -6287,7 +6332,7 @@ static int put_elf_sym(Section *s,
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Elf32_Sym *sym;
|
||||
Section *hs;
|
||||
|
||||
sym = (Elf32_Sym *)s->data_ptr;
|
||||
sym = section_ptr_add(s, sizeof(Elf32_Sym));
|
||||
if (name)
|
||||
name_offset = put_elf_str(s->link, name);
|
||||
else
|
||||
@ -6302,19 +6347,21 @@ static int put_elf_sym(Section *s,
|
||||
sym_index = sym - (Elf32_Sym *)s->data;
|
||||
hs = s->hash;
|
||||
if (hs) {
|
||||
int *ptr;
|
||||
ptr = section_ptr_add(hs, sizeof(int));
|
||||
/* only add global or weak symbols */
|
||||
if (ELF32_ST_BIND(info) != STB_LOCAL) {
|
||||
/* add another hashing entry */
|
||||
nbuckets = ((int *)hs->data)[0];
|
||||
h = elf_hash(name) % nbuckets;
|
||||
((int *)hs->data)[2 + nbuckets + sym_index] = ((int *)hs->data)[2 + h];
|
||||
*ptr = ((int *)hs->data)[2 + h];
|
||||
((int *)hs->data)[2 + h] = sym_index;
|
||||
} else {
|
||||
*ptr = 0;
|
||||
}
|
||||
/* but still add room for all symbols */
|
||||
((int *)hs->data)[1]++;
|
||||
hs->data_ptr += sizeof(int);
|
||||
}
|
||||
s->data_ptr += sizeof(Elf32_Sym);
|
||||
return sym_index;
|
||||
}
|
||||
|
||||
@ -6483,11 +6530,9 @@ static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
|
||||
sr->sh_info = s->sh_num;
|
||||
s->reloc = sr;
|
||||
}
|
||||
rel = (Elf32_Rel *)sr->data_ptr;
|
||||
/* XXX: endianness */
|
||||
rel = section_ptr_add(sr, sizeof(Elf32_Rel));
|
||||
rel->r_offset = offset;
|
||||
rel->r_info = ELF32_R_INFO(symbol, type);
|
||||
sr->data_ptr += sizeof(Elf32_Rel);
|
||||
}
|
||||
|
||||
/* put stab debug information */
|
||||
@ -6500,11 +6545,12 @@ typedef struct {
|
||||
unsigned long n_value; /* value of symbol */
|
||||
} Stab_Sym;
|
||||
|
||||
static void put_stabs(const char *str, int type, int other, int desc, int value)
|
||||
static void put_stabs(const char *str, int type, int other, int desc,
|
||||
unsigned long value)
|
||||
{
|
||||
Stab_Sym *sym;
|
||||
|
||||
sym = (Stab_Sym *)stab_section->data_ptr;
|
||||
sym = section_ptr_add(stab_section, sizeof(Stab_Sym));
|
||||
if (str) {
|
||||
sym->n_strx = put_elf_str(stabstr_section, str);
|
||||
} else {
|
||||
@ -6514,8 +6560,15 @@ static void put_stabs(const char *str, int type, int other, int desc, int value)
|
||||
sym->n_other = other;
|
||||
sym->n_desc = desc;
|
||||
sym->n_value = value;
|
||||
}
|
||||
|
||||
stab_section->data_ptr += sizeof(Stab_Sym);
|
||||
static void put_stabs_r(const char *str, int type, int other, int desc,
|
||||
unsigned long value, Section *sec, int sym_index)
|
||||
{
|
||||
put_stabs(str, type, other, desc, value);
|
||||
put_elf_reloc(symtab_section, stab_section,
|
||||
stab_section->data_offset - sizeof(unsigned long),
|
||||
R_DATA_32, sym_index);
|
||||
}
|
||||
|
||||
static void put_stabn(int type, int other, int desc, int value)
|
||||
@ -6538,11 +6591,11 @@ static void sort_syms(Section *s)
|
||||
Elf32_Sym *new_syms;
|
||||
int nb_syms, i;
|
||||
Elf32_Sym *p, *q;
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Rel *rel, *rel_end;
|
||||
Section *sr;
|
||||
int type, sym_index;
|
||||
|
||||
nb_syms = (s->data_ptr - s->data) / sizeof(Elf32_Sym);
|
||||
nb_syms = s->data_offset / sizeof(Elf32_Sym);
|
||||
new_syms = malloc(nb_syms * sizeof(Elf32_Sym));
|
||||
if (!new_syms)
|
||||
error("memory full");
|
||||
@ -6580,8 +6633,9 @@ static void sort_syms(Section *s)
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
sr = sections[i];
|
||||
if (sr->sh_type == SHT_REL && sr->link == s) {
|
||||
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
|
||||
for(rel = (Elf32_Rel *)sr->data;
|
||||
rel < (Elf32_Rel *)sr->data_ptr;
|
||||
rel < rel_end;
|
||||
rel++) {
|
||||
sym_index = ELF32_R_SYM(rel->r_info);
|
||||
type = ELF32_R_TYPE(rel->r_info);
|
||||
@ -6597,21 +6651,22 @@ static void sort_syms(Section *s)
|
||||
/* relocate common symbols in the .bss section */
|
||||
static void relocate_common_syms(void)
|
||||
{
|
||||
Elf32_Sym *sym;
|
||||
Elf32_Sym *sym, *sym_end;
|
||||
unsigned long offset, align;
|
||||
|
||||
sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset);
|
||||
for(sym = (Elf32_Sym *)symtab_section->data + 1;
|
||||
sym < (Elf32_Sym *)symtab_section->data_ptr;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_COMMON) {
|
||||
/* align symbol */
|
||||
align = sym->st_value;
|
||||
offset = bss_section->data_ptr - bss_section->data;
|
||||
offset = bss_section->data_offset;
|
||||
offset = (offset + align - 1) & -align;
|
||||
sym->st_value = offset;
|
||||
sym->st_shndx = bss_section->sh_num;
|
||||
offset += sym->st_size;
|
||||
bss_section->data_ptr = bss_section->data + offset;
|
||||
bss_section->data_offset = offset;
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -6625,13 +6680,14 @@ static void *resolve_sym(const char *sym)
|
||||
true and output error if undefined symbol. */
|
||||
static void relocate_syms(int do_resolve)
|
||||
{
|
||||
Elf32_Sym *sym, *esym;
|
||||
Elf32_Sym *sym, *esym, *sym_end;
|
||||
int sym_bind, sh_num, sym_index;
|
||||
const char *name;
|
||||
unsigned long addr;
|
||||
|
||||
sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset);
|
||||
for(sym = (Elf32_Sym *)symtab_section->data + 1;
|
||||
sym < (Elf32_Sym *)symtab_section->data_ptr;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
sh_num = sym->st_shndx;
|
||||
if (sh_num == SHN_UNDEF) {
|
||||
@ -6707,15 +6763,16 @@ static void elf_reloc(unsigned char *ptr,
|
||||
static void relocate_section(Section *s)
|
||||
{
|
||||
Section *sr;
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Rel *rel, *rel_end;
|
||||
Elf32_Sym *sym;
|
||||
int type, sym_index;
|
||||
unsigned char *ptr;
|
||||
unsigned long val;
|
||||
|
||||
sr = s->reloc;
|
||||
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
|
||||
for(rel = (Elf32_Rel *)sr->data;
|
||||
rel < (Elf32_Rel *)sr->data_ptr;
|
||||
rel < rel_end;
|
||||
rel++) {
|
||||
ptr = s->data + rel->r_offset;
|
||||
|
||||
@ -6731,11 +6788,12 @@ static void relocate_section(Section *s)
|
||||
static void relocate_rel(Section *sr)
|
||||
{
|
||||
Section *s;
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Rel *rel, *rel_end;
|
||||
|
||||
s = sections[sr->sh_info];
|
||||
rel_end = (Elf32_Rel *)(sr->data + sr->data_offset);
|
||||
for(rel = (Elf32_Rel *)sr->data;
|
||||
rel < (Elf32_Rel *)sr->data_ptr;
|
||||
rel < rel_end;
|
||||
rel++) {
|
||||
rel->r_offset += s->sh_addr;
|
||||
}
|
||||
@ -6773,19 +6831,19 @@ static void put32(unsigned char *p, unsigned int val)
|
||||
|
||||
static void build_got(void)
|
||||
{
|
||||
unsigned char *ptr;
|
||||
|
||||
/* if no got, then create it */
|
||||
got = new_section(".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
|
||||
got->sh_entsize = 4;
|
||||
add_elf_sym(symtab_section, 0, 4, ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT),
|
||||
got->sh_num, "_GLOBAL_OFFSET_TABLE_");
|
||||
ptr = section_ptr_add(got, 3 * sizeof(int));
|
||||
/* keep space for _DYNAMIC pointer, if present */
|
||||
got->data_ptr += 4;
|
||||
|
||||
put32(ptr, 0);
|
||||
/* two dummy got entries */
|
||||
put32(got->data_ptr, 0);
|
||||
got->data_ptr += 4;
|
||||
put32(got->data_ptr, 0);
|
||||
got->data_ptr += 4;
|
||||
put32(ptr + 4, 0);
|
||||
put32(ptr + 8, 0);
|
||||
}
|
||||
|
||||
/* put a got entry corresponding to a symbol in symtab_section. 'size'
|
||||
@ -6797,6 +6855,7 @@ static void put_got_entry(int reloc_type, unsigned long size, int info,
|
||||
const char *name;
|
||||
Elf32_Sym *sym;
|
||||
unsigned long offset;
|
||||
int *ptr;
|
||||
|
||||
if (!got)
|
||||
build_got();
|
||||
@ -6806,7 +6865,7 @@ static void put_got_entry(int reloc_type, unsigned long size, int info,
|
||||
got_offsets[sym_index] != 0)
|
||||
return;
|
||||
|
||||
put_got_offset(sym_index, got->data_ptr - got->data);
|
||||
put_got_offset(sym_index, got->data_offset);
|
||||
|
||||
if (dynsym) {
|
||||
sym = &((Elf32_Sym *)symtab_section->data)[sym_index];
|
||||
@ -6815,24 +6874,24 @@ static void put_got_entry(int reloc_type, unsigned long size, int info,
|
||||
/* NOTE: we put temporarily the got offset */
|
||||
if (reloc_type == R_386_JMP_SLOT) {
|
||||
nb_plt_entries++;
|
||||
offset = got->data_ptr - got->data;
|
||||
offset = got->data_offset;
|
||||
}
|
||||
index = put_elf_sym(dynsym, offset,
|
||||
size, info, 0, sym->st_shndx, name);
|
||||
/* put a got entry */
|
||||
put_elf_reloc(dynsym, got,
|
||||
got->data_ptr - got->data,
|
||||
got->data_offset,
|
||||
reloc_type, index);
|
||||
}
|
||||
put32(got->data_ptr, 0);
|
||||
got->data_ptr += 4;
|
||||
ptr = section_ptr_add(got, sizeof(int));
|
||||
*ptr = 0;
|
||||
}
|
||||
|
||||
/* build GOT and PLT entries */
|
||||
static void build_got_entries(void)
|
||||
{
|
||||
Section *s, *symtab;
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Rel *rel, *rel_end;
|
||||
Elf32_Sym *sym;
|
||||
int i, type, reloc_type, sym_index;
|
||||
|
||||
@ -6844,8 +6903,9 @@ static void build_got_entries(void)
|
||||
if (s->link != symtab_section)
|
||||
continue;
|
||||
symtab = s->link;
|
||||
rel_end = (Elf32_Rel *)(s->data + s->data_offset);
|
||||
for(rel = (Elf32_Rel *)s->data;
|
||||
rel < (Elf32_Rel *)s->data_ptr;
|
||||
rel < rel_end;
|
||||
rel++) {
|
||||
type = ELF32_R_TYPE(rel->r_info);
|
||||
switch(type) {
|
||||
@ -6882,7 +6942,7 @@ static Section *new_section_hash(const char *name, int sh_flags,
|
||||
((int *)hash->data)[0] = nb_buckets;
|
||||
((int *)hash->data)[1] = 1;
|
||||
hash->sh_entsize = sizeof(int);
|
||||
hash->data_ptr += (2 + nb_buckets + 1) * sizeof(int);
|
||||
section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
|
||||
symtab->hash = hash;
|
||||
hash->link = symtab;
|
||||
return hash;
|
||||
@ -6892,24 +6952,24 @@ static Section *new_section_hash(const char *name, int sh_flags,
|
||||
static void put_dt(Section *dynamic, int dt, unsigned long val)
|
||||
{
|
||||
Elf32_Dyn *dyn;
|
||||
dyn = (Elf32_Dyn *)dynamic->data_ptr;
|
||||
dyn = section_ptr_add(dynamic, sizeof(Elf32_Dyn));
|
||||
dyn->d_tag = dt;
|
||||
dyn->d_un.d_val = val;
|
||||
dynamic->data_ptr += sizeof(Elf32_Dyn);
|
||||
}
|
||||
|
||||
/* add tcc runtime libraries */
|
||||
static void tcc_add_runtime(TCCState *s1)
|
||||
{
|
||||
char buf[1024];
|
||||
unsigned long *ptr;
|
||||
|
||||
snprintf(buf, sizeof(buf), "%s/%s", tcc_lib_path, "libtcc1.o");
|
||||
tcc_add_file(s1, buf);
|
||||
#ifdef CONFIG_TCC_BCHECK
|
||||
if (do_bounds_check) {
|
||||
/* XXX: add an object file to do that */
|
||||
*(int *)bounds_section->data_ptr = 0;
|
||||
bounds_section->data_ptr += sizeof(int);
|
||||
ptr = section_ptr_add(bounds_section, sizeof(unsigned long));
|
||||
*ptr = 0;
|
||||
add_elf_sym(symtab_section, 0, 0,
|
||||
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
||||
bounds_section->sh_num, "__bounds_start");
|
||||
@ -6928,15 +6988,15 @@ static void tcc_add_runtime(TCCState *s1)
|
||||
}
|
||||
/* add various standard linker symbols */
|
||||
add_elf_sym(symtab_section,
|
||||
text_section->data_ptr - text_section->data, 0,
|
||||
text_section->data_offset, 0,
|
||||
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
||||
text_section->sh_num, "_etext");
|
||||
add_elf_sym(symtab_section,
|
||||
data_section->data_ptr - data_section->data, 0,
|
||||
data_section->data_offset, 0,
|
||||
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
||||
data_section->sh_num, "_edata");
|
||||
add_elf_sym(symtab_section,
|
||||
bss_section->data_ptr - bss_section->data, 0,
|
||||
bss_section->data_offset, 0,
|
||||
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
||||
bss_section->sh_num, "_end");
|
||||
}
|
||||
@ -6962,7 +7022,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
Elf32_Shdr shdr, *sh;
|
||||
Elf32_Phdr *phdr, *ph;
|
||||
Section *interp, *plt, *dynamic, *dynstr, *hash;
|
||||
unsigned char *saved_dynamic_data_ptr;
|
||||
unsigned long saved_dynamic_data_offset;
|
||||
Elf32_Sym *sym;
|
||||
int type, file_type;
|
||||
unsigned long rel_addr, rel_size;
|
||||
@ -6980,7 +7040,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
plt = NULL; /* avoid warning */
|
||||
hash = NULL; /* avoid warning */
|
||||
dynstr = NULL; /* avoid warning */
|
||||
saved_dynamic_data_ptr = NULL; /* avoid warning */
|
||||
saved_dynamic_data_offset = 0; /* avoid warning */
|
||||
|
||||
if (file_type != TCC_OUTPUT_OBJ) {
|
||||
|
||||
@ -6989,14 +7049,15 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
if (!static_link) {
|
||||
const char *name;
|
||||
int sym_index, index;
|
||||
Elf32_Sym *esym;
|
||||
Elf32_Sym *esym, *sym_end;
|
||||
|
||||
if (file_type == TCC_OUTPUT_EXE) {
|
||||
char *ptr;
|
||||
/* add interpreter section only if executable */
|
||||
interp = new_section(".interp", SHT_PROGBITS, SHF_ALLOC);
|
||||
interp->sh_addralign = 1;
|
||||
strcpy(interp->data_ptr, elf_interp);
|
||||
interp->data_ptr += sizeof(elf_interp);
|
||||
ptr = section_ptr_add(interp, sizeof(elf_interp));
|
||||
strcpy(ptr, elf_interp);
|
||||
}
|
||||
|
||||
/* add dynamic symbol table */
|
||||
@ -7025,8 +7086,10 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
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 < (Elf32_Sym *)symtab_section->data_ptr;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
name = symtab_section->link->data + sym->st_name;
|
||||
@ -7040,7 +7103,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
sym - (Elf32_Sym *)symtab_section->data);
|
||||
} else if (type == STT_OBJECT) {
|
||||
unsigned long offset;
|
||||
offset = bss_section->data_ptr - bss_section->data;
|
||||
offset = bss_section->data_offset;
|
||||
/* XXX: which alignment ? */
|
||||
offset = (offset + 8 - 1) & -8;
|
||||
index = put_elf_sym(dynsym, offset, esym->st_size,
|
||||
@ -7049,7 +7112,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
put_elf_reloc(dynsym, bss_section,
|
||||
offset, R_386_COPY, index);
|
||||
offset += esym->st_size;
|
||||
bss_section->data_ptr = bss_section->data + offset;
|
||||
bss_section->data_offset = offset;
|
||||
}
|
||||
} else {
|
||||
/* STT_NOTYPE or STB_WEAK undefined symbols
|
||||
@ -7068,8 +7131,10 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
|
||||
/* 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 < (Elf32_Sym *)dynsymtab_section->data_ptr;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
name = dynsymtab_section->link->data + sym->st_name;
|
||||
@ -7088,7 +7153,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
build_got_entries();
|
||||
|
||||
/* update PLT/GOT sizes so that we can allocate their space */
|
||||
plt->data_ptr += 16 * (nb_plt_entries + 1);
|
||||
plt->data_offset += 16 * (nb_plt_entries + 1);
|
||||
|
||||
/* add a list of needed dlls */
|
||||
for(i = 0; i < nb_loaded_dlls; i++) {
|
||||
@ -7098,8 +7163,8 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
}
|
||||
|
||||
/* add necessary space for other entries */
|
||||
saved_dynamic_data_ptr = dynamic->data_ptr;
|
||||
dynamic->data_ptr += 8 * 9;
|
||||
saved_dynamic_data_offset = dynamic->data_offset;
|
||||
dynamic->data_offset += 8 * 9;
|
||||
} else {
|
||||
/* still need to build got entries in case of static link */
|
||||
build_got_entries();
|
||||
@ -7143,7 +7208,7 @@ 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);
|
||||
s->sh_size = s->data_ptr - s->data;
|
||||
s->sh_size = s->data_offset;
|
||||
}
|
||||
|
||||
/* allocate program segment headers */
|
||||
@ -7264,6 +7329,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
if (dynamic) {
|
||||
int plt_offset;
|
||||
unsigned char *p;
|
||||
Elf32_Sym *sym_end;
|
||||
|
||||
ph = &phdr[phnum - 1];
|
||||
|
||||
@ -7280,42 +7346,41 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
put32(got->data, dynamic->sh_addr);
|
||||
|
||||
/* compute the PLT */
|
||||
plt->data_ptr = plt->data;
|
||||
plt->data_offset = 0;
|
||||
|
||||
/* first plt entry */
|
||||
p = plt->data_ptr;
|
||||
p = section_ptr_add(plt, 16);
|
||||
p[0] = 0xff; /* pushl got + 4 */
|
||||
p[1] = 0x35;
|
||||
put32(p + 2, got->sh_addr + 4);
|
||||
p[6] = 0xff; /* jmp *(got + 8) */
|
||||
p[7] = 0x25;
|
||||
put32(p + 8, got->sh_addr + 8);
|
||||
plt->data_ptr += 16;
|
||||
|
||||
/* relocation symbols in .dynsym and build PLT. */
|
||||
plt_offset = 0;
|
||||
sym_end = (Elf32_Sym *)(dynsym->data + dynsym->data_offset);
|
||||
for(sym = (Elf32_Sym *)dynsym->data + 1;
|
||||
sym < (Elf32_Sym *)dynsym->data_ptr;
|
||||
sym < sym_end;
|
||||
sym++) {
|
||||
type = ELF32_ST_TYPE(sym->st_info);
|
||||
if (sym->st_shndx == SHN_UNDEF) {
|
||||
if (type == STT_FUNC) {
|
||||
/* one more entry in PLT */
|
||||
p = plt->data_ptr;
|
||||
p = section_ptr_add(plt, 16);
|
||||
p[0] = 0xff; /* jmp *(got + x) */
|
||||
p[1] = 0x25;
|
||||
put32(p + 2, got->sh_addr + sym->st_value);
|
||||
p[6] = 0x68; /* push $xxx */
|
||||
put32(p + 7, plt_offset);
|
||||
p[11] = 0xe9; /* jmp plt_start */
|
||||
put32(p + 12, -(plt->data_ptr + 16 - plt->data));
|
||||
put32(p + 12, -(plt->data_offset));
|
||||
|
||||
/* patch symbol value to point to plt */
|
||||
sym->st_value = plt->sh_addr + p - plt->data;
|
||||
|
||||
plt_offset += 8;
|
||||
plt->data_ptr += 16;
|
||||
}
|
||||
}
|
||||
} else if (sym->st_shndx < SHN_LORESERVE) {
|
||||
/* do symbol relocation */
|
||||
sym->st_value += sections[sym->st_shndx]->sh_addr;
|
||||
@ -7323,11 +7388,11 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
}
|
||||
/* put dynamic section entries */
|
||||
|
||||
dynamic->data_ptr = saved_dynamic_data_ptr;
|
||||
dynamic->data_offset = saved_dynamic_data_offset;
|
||||
put_dt(dynamic, DT_HASH, 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_ptr - dynstr->data);
|
||||
put_dt(dynamic, DT_STRSZ, dynstr->data_offset);
|
||||
put_dt(dynamic, DT_SYMENT, sizeof(Elf32_Sym));
|
||||
put_dt(dynamic, DT_REL, rel_addr);
|
||||
put_dt(dynamic, DT_RELSZ, rel_size);
|
||||
@ -7363,12 +7428,12 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
/* XXX: ignore sections with allocated relocations ? */
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
if ((s->sh_flags & SHF_ALLOC)
|
||||
&& s->reloc && s != got)
|
||||
if (s->reloc && s != got)
|
||||
relocate_section(s);
|
||||
}
|
||||
|
||||
/* relocate relocation entries */
|
||||
/* relocate relocation entries if the relocation tables are
|
||||
allocated in the executable */
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
if ((s->sh_flags & SHF_ALLOC) &&
|
||||
@ -7434,7 +7499,7 @@ int tcc_output_file(TCCState *s1, const char *filename)
|
||||
fputc(0, f);
|
||||
offset++;
|
||||
}
|
||||
size = s->data_ptr - s->data;
|
||||
size = s->data_offset;
|
||||
fwrite(s->data, 1, size, f);
|
||||
offset += size;
|
||||
}
|
||||
@ -7502,7 +7567,7 @@ static int tcc_load_object_file(TCCState *s1,
|
||||
char *sh_name, *name;
|
||||
SectionMergeInfo *sm_table, *sm;
|
||||
Elf32_Sym *sym, *symtab;
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Rel *rel, *rel_end;
|
||||
Section *s;
|
||||
|
||||
if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
|
||||
@ -7585,21 +7650,23 @@ static int tcc_load_object_file(TCCState *s1,
|
||||
goto fail;
|
||||
|
||||
/* align start of section */
|
||||
offset = s->data_ptr - s->data;
|
||||
offset = s->data_offset;
|
||||
size = sh->sh_addralign - 1;
|
||||
offset = (offset + size) & ~size;
|
||||
if (sh->sh_addralign > s->sh_addralign)
|
||||
s->sh_addralign = sh->sh_addralign;
|
||||
s->data_ptr = s->data + offset;
|
||||
s->data_offset = offset;
|
||||
sm_table[i].offset = offset;
|
||||
sm_table[i].s = s;
|
||||
/* concatenate sections */
|
||||
size = sh->sh_size;
|
||||
if (sh->sh_type != SHT_NOBITS) {
|
||||
unsigned char *ptr;
|
||||
lseek(fd, file_offset + sh->sh_offset, SEEK_SET);
|
||||
read(fd, s->data_ptr, size);
|
||||
ptr = section_ptr(s, size);
|
||||
read(fd, ptr, size);
|
||||
}
|
||||
s->data_ptr += size;
|
||||
s->data_offset += size;
|
||||
}
|
||||
|
||||
/* second short pass to update sh_link and sh_info fields of new
|
||||
@ -7655,8 +7722,9 @@ static int tcc_load_object_file(TCCState *s1,
|
||||
case SHT_REL:
|
||||
/* take relocation offset information */
|
||||
offseti = sm_table[sh->sh_info].offset;
|
||||
rel_end = (Elf32_Rel *)(s->data + s->data_offset);
|
||||
for(rel = (Elf32_Rel *)(s->data + offset);
|
||||
rel < (Elf32_Rel *)s->data_ptr;
|
||||
rel < rel_end;
|
||||
rel++) {
|
||||
int type;
|
||||
unsigned sym_index;
|
||||
@ -7945,7 +8013,7 @@ static void rt_printline(unsigned long wanted_pc)
|
||||
last_pc = 0xffffffff;
|
||||
last_line_num = 1;
|
||||
sym = (Stab_Sym *)stab_section->data + 1;
|
||||
sym_end = (Stab_Sym *)stab_section->data_ptr;
|
||||
sym_end = (Stab_Sym *)(stab_section->data + stab_section->data_offset);
|
||||
while (sym < sym_end) {
|
||||
switch(sym->n_type) {
|
||||
/* function start or end */
|
||||
@ -8098,7 +8166,7 @@ int tcc_run(TCCState *s1, int argc, char **argv)
|
||||
/* relocate each section */
|
||||
for(i = 1; i < nb_sections; i++) {
|
||||
s = sections[i];
|
||||
if ((s->sh_flags & SHF_ALLOC) && s->reloc)
|
||||
if (s->reloc)
|
||||
relocate_section(s);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user