* config/tc-sh.c (sh_elf_suffix): Removed.
(sh_PIC_related_p, sh_check_fixup, sh_cons_fix_new, sh_end_of_match, sh_parse_name): New functions. (sh_elf_cons): Simplify. (parse_exp): Reject misplaced PIC operands. (md_undefined_symbol): Simplify. (sh_fix_adjustable): Let @GOTOFF be adjusted. (md_apply_fix3): Write @PLT and @GOTOFF addends in place. (tc_gen_reloc): Move fixp subsy absolute value into addnumber. Complain if subsy remains at the end. * config/tc-sh.h (sh_parse_name, sh_cons_fix_new): Declare. (md_parse_name, TC_CONS_FIX_NEW, O_PIC_reloc): Define.
This commit is contained in:
Alexandre Oliva
parent
ea87b71bed
commit
538cd60fbb
3 changed files with 267 additions and 157 deletions
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@ -1,3 +1,18 @@
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2002-01-24 Alexandre Oliva <aoliva@redhat.com>
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* config/tc-sh.c (sh_elf_suffix): Removed.
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(sh_PIC_related_p, sh_check_fixup, sh_cons_fix_new,
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sh_end_of_match, sh_parse_name): New functions.
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(sh_elf_cons): Simplify.
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(parse_exp): Reject misplaced PIC operands.
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(md_undefined_symbol): Simplify.
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(sh_fix_adjustable): Let @GOTOFF be adjusted.
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(md_apply_fix3): Write @PLT and @GOTOFF addends in place.
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(tc_gen_reloc): Move fixp subsy absolute value into addnumber.
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Complain if subsy remains at the end.
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* config/tc-sh.h (sh_parse_name, sh_cons_fix_new): Declare.
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(md_parse_name, TC_CONS_FIX_NEW, O_PIC_reloc): Define.
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2002-01-22 Alexandre Oliva <aoliva@redhat.com>
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* config/tc-mn10300.c (xr_registers): Move `pc'...
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@ -58,8 +58,6 @@ static sh_opcode_info *find_cooked_opcode PARAMS ((char **));
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static unsigned int assemble_ppi PARAMS ((char *, sh_opcode_info *));
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static void little PARAMS ((int));
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static void big PARAMS ((int));
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static bfd_reloc_code_real_type sh_elf_suffix
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PARAMS ((char **str_p, expressionS *, expressionS *new_exp_p));
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static int parse_reg PARAMS ((char *, int *, int *));
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static symbolS *dot PARAMS ((void));
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static char *parse_exp PARAMS ((char *, sh_operand_info *));
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@ -78,6 +76,10 @@ static unsigned int build_Mytes
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#ifdef OBJ_ELF
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static void sh_elf_cons PARAMS ((int));
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inline static int sh_PIC_related_p PARAMS ((symbolS *));
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static int sh_check_fixup PARAMS ((expressionS *, bfd_reloc_code_real_type *));
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inline static char *sh_end_of_match PARAMS ((char *, char *));
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symbolS *GOT_symbol; /* Pre-defined "_GLOBAL_OFFSET_TABLE_" */
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#endif
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@ -262,77 +264,150 @@ static struct hash_control *opcode_hash_control; /* Opcode mnemonics */
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#ifdef OBJ_ELF
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/* Parse @got, etc. and return the desired relocation.
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If we have additional arithmetic expression, then we fill in new_exp_p. */
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static bfd_reloc_code_real_type
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sh_elf_suffix (str_p, exp_p, new_exp_p)
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char **str_p;
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expressionS *exp_p, *new_exp_p;
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/* Determinet whether the symbol needs any kind of PIC relocation. */
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inline static int
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sh_PIC_related_p (sym)
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symbolS *sym;
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{
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struct map_bfd {
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char *string;
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int length;
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bfd_reloc_code_real_type reloc;
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};
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expressionS *exp;
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char ident[20];
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char *str = *str_p;
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char *str2;
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int ch;
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int len;
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struct map_bfd *ptr;
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if (! sym)
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return 0;
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#define MAP(str,reloc) { str, sizeof (str)-1, reloc }
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if (sym == GOT_symbol)
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return 1;
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static struct map_bfd mapping[] = {
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MAP ("got", BFD_RELOC_32_GOT_PCREL),
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MAP ("plt", BFD_RELOC_32_PLT_PCREL),
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MAP ("gotoff", BFD_RELOC_32_GOTOFF),
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{ (char *)0, 0, BFD_RELOC_UNUSED }
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};
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exp = symbol_get_value_expression (sym);
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if (*str++ != '@')
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return BFD_RELOC_UNUSED;
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return (exp->X_op == O_PIC_reloc
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|| sh_PIC_related_p (exp->X_add_symbol)
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|| sh_PIC_related_p (exp->X_op_symbol));
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}
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for (ch = *str, str2 = ident;
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(str2 < ident + sizeof (ident) - 1
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&& (ISALNUM (ch) || ch == '@'));
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ch = *++str)
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*str2++ = TOLOWER (ch);
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/* Determine the relocation type to be used to represent the
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expression, that may be rearranged. */
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*str2 = '\0';
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len = str2 - ident;
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static int
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sh_check_fixup (main_exp, r_type_p)
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expressionS *main_exp;
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bfd_reloc_code_real_type *r_type_p;
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{
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expressionS *exp = main_exp;
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ch = ident[0];
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for (ptr = &mapping[0]; ptr->length > 0; ptr++)
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if (ch == ptr->string[0]
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&& len == ptr->length
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&& memcmp (ident, ptr->string, ptr->length) == 0)
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/* This is here for backward-compatibility only. GCC used to generated:
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f@PLT + . - (.LPCS# + 2)
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but we'd rather be able to handle this as a PIC-related reference
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plus/minus a symbol. However, gas' parser gives us:
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O_subtract (O_add (f@PLT, .), .LPCS#+2)
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so we attempt to transform this into:
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O_subtract (f@PLT, O_subtract (.LPCS#+2, .))
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which we can handle simply below. */
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if (exp->X_op == O_subtract)
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{
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if (sh_PIC_related_p (exp->X_op_symbol))
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return 1;
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exp = symbol_get_value_expression (exp->X_add_symbol);
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if (exp && sh_PIC_related_p (exp->X_op_symbol))
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return 1;
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if (exp && exp->X_op == O_add
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&& sh_PIC_related_p (exp->X_add_symbol))
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{
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symbolS *sym = exp->X_add_symbol;
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exp->X_op = O_subtract;
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exp->X_add_symbol = main_exp->X_op_symbol;
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main_exp->X_op_symbol = main_exp->X_add_symbol;
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main_exp->X_add_symbol = sym;
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main_exp->X_add_number += exp->X_add_number;
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exp->X_add_number = 0;
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}
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exp = main_exp;
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}
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else if (exp->X_op == O_add && sh_PIC_related_p (exp->X_op_symbol))
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return 1;
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if (exp->X_op == O_symbol || exp->X_op == O_add || exp->X_op == O_subtract)
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{
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if (exp->X_add_symbol && exp->X_add_symbol == GOT_symbol)
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{
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*r_type_p = BFD_RELOC_SH_GOTPC;
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return 0;
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}
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exp = symbol_get_value_expression (exp->X_add_symbol);
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if (! exp)
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return 0;
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}
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if (exp->X_op == O_PIC_reloc)
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{
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*r_type_p = exp->X_md;
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if (exp == main_exp)
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exp->X_op = O_symbol;
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else
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{
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main_exp->X_add_symbol = exp->X_add_symbol;
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main_exp->X_add_number += exp->X_add_number;
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}
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}
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else
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return (sh_PIC_related_p (exp->X_add_symbol)
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|| sh_PIC_related_p (exp->X_op_symbol));
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return 0;
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}
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/* Add expression EXP of SIZE bytes to offset OFF of fragment FRAG. */
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void
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sh_cons_fix_new (frag, off, size, exp)
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fragS *frag;
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int off, size;
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expressionS *exp;
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{
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bfd_reloc_code_real_type r_type = BFD_RELOC_UNUSED;
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if (sh_check_fixup (exp, &r_type))
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as_bad (_("Invalid PIC expression."));
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if (r_type == BFD_RELOC_UNUSED)
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switch (size)
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{
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/* Now check for identifier@suffix+constant */
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if (*str == '-' || *str == '+')
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{
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char *orig_line = input_line_pointer;
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case 1:
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r_type = BFD_RELOC_8;
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break;
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input_line_pointer = str;
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expression (new_exp_p);
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if (new_exp_p->X_op == O_constant)
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{
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exp_p->X_add_number += new_exp_p->X_add_number;
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str = input_line_pointer;
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}
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if (new_exp_p->X_op == O_subtract)
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str = input_line_pointer;
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case 2:
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r_type = BFD_RELOC_16;
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break;
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if (&input_line_pointer != str_p)
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input_line_pointer = orig_line;
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}
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case 4:
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r_type = BFD_RELOC_32;
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break;
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*str_p = str;
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return ptr->reloc;
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default:
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goto error;
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}
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return BFD_RELOC_UNUSED;
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else if (size != 4)
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{
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error:
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as_bad (_("unsupported BFD relocation size %u"), size);
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r_type = BFD_RELOC_UNUSED;
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}
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fix_new_exp (frag, off, size, exp, 0, r_type);
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}
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/* The regular cons() function, that reads constants, doesn't support
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@ -343,9 +418,7 @@ static void
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sh_elf_cons (nbytes)
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register int nbytes; /* 1=.byte, 2=.word, 4=.long */
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{
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expressionS exp, new_exp;
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bfd_reloc_code_real_type reloc;
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const char *name;
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expressionS exp;
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if (is_it_end_of_statement ())
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{
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@ -356,79 +429,7 @@ sh_elf_cons (nbytes)
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do
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{
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expression (&exp);
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new_exp.X_op = O_absent;
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new_exp.X_add_symbol = new_exp.X_op_symbol = NULL;
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/* If the _GLOBAL_OFFSET_TABLE_ symbol hasn't been found yet,
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use the name of the symbol to tell whether it's the
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_GLOBAL_OFFSET_TABLE_. If it has, comparing the symbols is
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sufficient. */
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if (! GOT_symbol && exp.X_add_symbol)
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name = S_GET_NAME (exp.X_add_symbol);
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else
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name = NULL;
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/* Check whether this expression involves the
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_GLOBAL_OFFSET_TABLE_ symbol, by itself or added to a
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difference of two other symbols. */
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if (((GOT_symbol && GOT_symbol == exp.X_add_symbol)
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|| (! GOT_symbol && name
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&& strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0))
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&& (exp.X_op == O_symbol
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|| (exp.X_op == O_add
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&& ((symbol_get_value_expression (exp.X_op_symbol)->X_op)
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== O_subtract))))
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{
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reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput,
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BFD_RELOC_32);
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int size = bfd_get_reloc_size (reloc_howto);
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if (GOT_symbol == NULL)
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GOT_symbol = symbol_find_or_make (GLOBAL_OFFSET_TABLE_NAME);
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if (size > nbytes)
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as_bad (_("%s relocations do not fit in %d bytes\n"),
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reloc_howto->name, nbytes);
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else
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{
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register char *p = frag_more ((int) nbytes);
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int offset = nbytes - size;
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fix_new_exp (frag_now, p - frag_now->fr_literal + offset,
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size, &exp, 0, TC_RELOC_GLOBAL_OFFSET_TABLE);
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}
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}
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/* Check if this symbol involves one of the magic suffixes, such
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as @GOT, @GOTOFF or @PLT, and determine which relocation type
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to use. */
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else if ((exp.X_op == O_symbol || (exp.X_op == O_add && exp.X_op_symbol))
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&& *input_line_pointer == '@'
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&& ((reloc = sh_elf_suffix (&input_line_pointer, &exp, &new_exp))
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!= BFD_RELOC_UNUSED))
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{
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reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput,
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reloc);
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int size = bfd_get_reloc_size (reloc_howto);
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/* Force a GOT to be generated. */
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if (GOT_symbol == NULL)
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GOT_symbol = symbol_find_or_make (GLOBAL_OFFSET_TABLE_NAME);
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|
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if (size > nbytes)
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as_bad (_("%s relocations do not fit in %d bytes\n"),
|
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reloc_howto->name, nbytes);
|
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else
|
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{
|
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register char *p = frag_more ((int) nbytes);
|
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int offset = nbytes - size;
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fix_new_exp (frag_now, p - frag_now->fr_literal + offset, size,
|
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&exp, 0, reloc);
|
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if (new_exp.X_op != O_absent)
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fix_new_exp (frag_now, p - frag_now->fr_literal + offset, size,
|
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&new_exp, 0, BFD_RELOC_32);
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}
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}
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else
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emit_expr (&exp, (unsigned int) nbytes);
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emit_expr (&exp, (unsigned int) nbytes);
|
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}
|
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while (*input_line_pointer++ == ',');
|
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@ -867,6 +868,12 @@ parse_exp (s, op)
|
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expression (&op->immediate);
|
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if (op->immediate.X_op == O_absent)
|
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as_bad (_("missing operand"));
|
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#ifdef OBJ_ELF
|
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else if (op->immediate.X_op == O_PIC_reloc
|
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|| sh_PIC_related_p (op->immediate.X_add_symbol)
|
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|| sh_PIC_related_p (op->immediate.X_op_symbol))
|
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as_bad (_("misplaced PIC operand"));
|
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#endif
|
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new = input_line_pointer;
|
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input_line_pointer = save;
|
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return new;
|
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|
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@ -2012,26 +2019,8 @@ sh_flush_pending_output ()
|
|||
|
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symbolS *
|
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md_undefined_symbol (name)
|
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char *name;
|
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char *name ATTRIBUTE_UNUSED;
|
||||
{
|
||||
#ifdef OBJ_ELF
|
||||
/* Under ELF we need to default _GLOBAL_OFFSET_TABLE. Otherwise we
|
||||
have no need to default values of symbols. */
|
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if (strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0)
|
||||
{
|
||||
if (!GOT_symbol)
|
||||
{
|
||||
if (symbol_find (name))
|
||||
as_bad ("GOT already in the symbol table");
|
||||
|
||||
GOT_symbol = symbol_new (name, undefined_section,
|
||||
(valueT)0, & zero_address_frag);
|
||||
}
|
||||
|
||||
return GOT_symbol;
|
||||
}
|
||||
#endif /* OBJ_ELF */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2741,7 +2730,6 @@ sh_fix_adjustable (fixP)
|
|||
return 1;
|
||||
|
||||
if (! TC_RELOC_RTSYM_LOC_FIXUP (fixP)
|
||||
|| fixP->fx_r_type == BFD_RELOC_32_GOTOFF
|
||||
|| fixP->fx_r_type == BFD_RELOC_RVA)
|
||||
return 0;
|
||||
|
||||
|
|
@ -2980,6 +2968,8 @@ md_apply_fix3 (fixP, valP, seg)
|
|||
/* Make the jump instruction point to the address of the operand. At
|
||||
runtime we merely add the offset to the actual PLT entry. */
|
||||
* valP = 0xfffffffc;
|
||||
val = fixP->fx_addnumber - S_GET_VALUE (fixP->fx_subsy);
|
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md_number_to_chars (buf, val, 4);
|
||||
break;
|
||||
|
||||
case BFD_RELOC_SH_GOTPC:
|
||||
|
|
@ -3009,6 +2999,7 @@ md_apply_fix3 (fixP, valP, seg)
|
|||
break;
|
||||
|
||||
case BFD_RELOC_32_GOTOFF:
|
||||
md_number_to_chars (buf, val, 4);
|
||||
break;
|
||||
#endif
|
||||
|
||||
|
|
@ -3322,6 +3313,13 @@ tc_gen_reloc (section, fixp)
|
|||
*rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
|
||||
rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
|
||||
|
||||
if (fixp->fx_subsy
|
||||
&& S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
|
||||
{
|
||||
fixp->fx_addnumber -= S_GET_VALUE (fixp->fx_subsy);
|
||||
fixp->fx_subsy = 0;
|
||||
}
|
||||
|
||||
r_type = fixp->fx_r_type;
|
||||
|
||||
if (SWITCH_TABLE (fixp))
|
||||
|
|
@ -3361,7 +3359,7 @@ tc_gen_reloc (section, fixp)
|
|||
rel->addend = 0;
|
||||
|
||||
rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
|
||||
if (rel->howto == NULL)
|
||||
if (rel->howto == NULL || fixp->fx_subsy)
|
||||
{
|
||||
as_bad_where (fixp->fx_file, fixp->fx_line,
|
||||
_("Cannot represent relocation type %s"),
|
||||
|
|
@ -3374,4 +3372,87 @@ tc_gen_reloc (section, fixp)
|
|||
return rel;
|
||||
}
|
||||
|
||||
#ifdef OBJ_ELF
|
||||
inline static char *
|
||||
sh_end_of_match (cont, what)
|
||||
char *cont, *what;
|
||||
{
|
||||
int len = strlen (what);
|
||||
|
||||
if (strncasecmp (cont, what, strlen (what)) == 0
|
||||
&& ! is_part_of_name (cont[len]))
|
||||
return cont + len;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int
|
||||
sh_parse_name (name, exprP, nextcharP)
|
||||
char const *name;
|
||||
expressionS *exprP;
|
||||
char *nextcharP;
|
||||
{
|
||||
char *next = input_line_pointer;
|
||||
char *next_end;
|
||||
int reloc_type;
|
||||
segT segment;
|
||||
|
||||
exprP->X_op_symbol = NULL;
|
||||
|
||||
if (strcmp (name, GLOBAL_OFFSET_TABLE_NAME) == 0)
|
||||
{
|
||||
if (! GOT_symbol)
|
||||
GOT_symbol = symbol_find_or_make (name);
|
||||
|
||||
exprP->X_add_symbol = GOT_symbol;
|
||||
no_suffix:
|
||||
/* If we have an absolute symbol or a reg, then we know its
|
||||
value now. */
|
||||
segment = S_GET_SEGMENT (exprP->X_add_symbol);
|
||||
if (segment == absolute_section)
|
||||
{
|
||||
exprP->X_op = O_constant;
|
||||
exprP->X_add_number = S_GET_VALUE (exprP->X_add_symbol);
|
||||
exprP->X_add_symbol = NULL;
|
||||
}
|
||||
else if (segment == reg_section)
|
||||
{
|
||||
exprP->X_op = O_register;
|
||||
exprP->X_add_number = S_GET_VALUE (exprP->X_add_symbol);
|
||||
exprP->X_add_symbol = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
exprP->X_op = O_symbol;
|
||||
exprP->X_add_number = 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
exprP->X_add_symbol = symbol_find_or_make (name);
|
||||
|
||||
if (*nextcharP != '@')
|
||||
goto no_suffix;
|
||||
else if ((next_end = sh_end_of_match (next + 1, "GOTOFF")))
|
||||
reloc_type = BFD_RELOC_32_GOTOFF;
|
||||
else if ((next_end = sh_end_of_match (next + 1, "GOT")))
|
||||
reloc_type = BFD_RELOC_32_GOT_PCREL;
|
||||
else if ((next_end = sh_end_of_match (next + 1, "PLT")))
|
||||
reloc_type = BFD_RELOC_32_PLT_PCREL;
|
||||
else
|
||||
goto no_suffix;
|
||||
|
||||
*input_line_pointer = *nextcharP;
|
||||
input_line_pointer = next_end;
|
||||
*nextcharP = *input_line_pointer;
|
||||
*input_line_pointer = '\0';
|
||||
|
||||
exprP->X_op = O_PIC_reloc;
|
||||
exprP->X_add_number = 0;
|
||||
exprP->X_md = reloc_type;
|
||||
|
||||
return 1;
|
||||
}
|
||||
#endif
|
||||
#endif /* BFD_ASSEMBLER */
|
||||
|
|
|
|||
|
|
@ -210,4 +210,18 @@ extern void sh_elf_final_processing PARAMS ((void));
|
|||
&& S_IS_DEFINED ((FIX)->fx_addsy) \
|
||||
&& ! S_IS_COMMON ((FIX)->fx_addsy))))
|
||||
|
||||
#define md_parse_name(name, exprP, nextcharP) \
|
||||
sh_parse_name ((name), (exprP), (nextcharP))
|
||||
int sh_parse_name PARAMS ((char const *name,
|
||||
expressionS *exprP,
|
||||
char *nextchar));
|
||||
|
||||
#define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP) \
|
||||
sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP))
|
||||
void sh_cons_fix_new PARAMS ((fragS *, int, int, expressionS *));
|
||||
|
||||
/* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
|
||||
symbols. The relocation type is stored in X_md. */
|
||||
#define O_PIC_reloc O_md1
|
||||
|
||||
#endif /* OBJ_ELF */
|
||||
|
|
|
|||
Loading…
Reference in a new issue