--- /dev/null
+/* Scenix IP2xxx specific support for 32-bit ELF
+ Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
+
+ This file is part of BFD, the Binary File Descriptor library.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/ip2k.h"
+
+/* Struct used to pass miscellaneous paramaters which
+ helps to avoid overly long parameter lists. */
+struct misc
+{
+ Elf_Internal_Shdr * symtab_hdr;
+ Elf_Internal_Rela * irelbase;
+ bfd_byte * contents;
+ bfd_byte * free_contents;
+ Elf32_External_Sym * extsyms;
+ Elf32_External_Sym * free_extsyms;
+ Elf_Internal_Rela * free_relocs;
+};
+
+/* Prototypes. */
+static reloc_howto_type * ip2k_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
+static void ip2k_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
+static asection * ip2k_elf_gc_mark_hook PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *));
+static boolean ip2k_elf_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *));
+static bfd_vma symbol_value PARAMS ((bfd *, Elf_Internal_Shdr *, Elf32_External_Sym *, Elf_Internal_Rela *));
+static void adjust_all_relocations PARAMS ((bfd *, asection *, bfd_vma, bfd_vma, int, int));
+static boolean ip2k_elf_relax_delete_bytes PARAMS ((bfd *, asection *, bfd_vma, int));
+static boolean ip2k_elf_relax_add_bytes PARAMS ((bfd *, asection *, bfd_vma, const bfd_byte *, int, int));
+static boolean add_page_insn PARAMS ((bfd *, asection *, Elf_Internal_Rela *, struct misc *));
+static boolean ip2k_elf_relax_section PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
+static boolean relax_switch_dispatch_tables_pass1 PARAMS ((bfd *, asection *, bfd_vma, struct misc *));
+static boolean unrelax_dispatch_table_entries PARAMS ((bfd *, asection *, bfd_vma, bfd_vma, boolean *, struct misc *));
+static boolean unrelax_switch_dispatch_tables_passN PARAMS ((bfd *, asection *, bfd_vma, boolean *, struct misc *));
+static boolean is_switch_128_dispatch_table_p PARAMS ((bfd *, bfd_vma, boolean, struct misc *));
+static boolean is_switch_256_dispatch_table_p PARAMS ((bfd *, bfd_vma, boolean, struct misc *));
+static void tidyup_after_error PARAMS ((struct misc *));
+static boolean ip2k_elf_relax_section_pass1 PARAMS ((bfd *, asection *, boolean *, struct misc *));
+static boolean ip2k_elf_relax_section_passN PARAMS ((bfd *, asection *, boolean *, boolean *, struct misc *));
+static bfd_reloc_status_type ip2k_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma));
+static boolean ip2k_elf_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
+
+#define IS_OPCODE(CODE0,CODE1,OPCODE) \
+ ((CODE0) == (OPCODE)[0] && (CODE1) == (OPCODE)[1])
+
+#define PAGE_INSN_0 0x00
+#define PAGE_INSN_1 0x10
+
+static const bfd_byte page_opcode[] =
+{
+ PAGE_INSN_0, PAGE_INSN_1
+};
+
+#define IS_PAGE_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, page_opcode)
+
+#define JMP_INSN_0 0xE0
+#define JMP_INSN_1 0x00
+
+static const bfd_byte jmp_opcode[] =
+{
+ JMP_INSN_0, JMP_INSN_1
+};
+
+#define IS_JMP_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, jmp_opcode)
+
+#define CALL_INSN_0 0xC0
+#define CALL_INSN_1 0x00
+
+static const bfd_byte call_opcode[] =
+{
+ CALL_INSN_0, CALL_INSN_1
+};
+
+#define IS_CALL_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, call_opcode)
+
+#define ADD_PCL_W_INSN_0 0x1E
+#define ADD_PCL_W_INSN_1 0x09
+
+static const bfd_byte add_pcl_w_opcode[] =
+{
+ ADD_PCL_W_INSN_0, ADD_PCL_W_INSN_1
+};
+
+#define IS_ADD_PCL_W_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, add_pcl_w_opcode)
+
+#define ADD_W_WREG_INSN_0 0x1C
+#define ADD_W_WREG_INSN_1 0x0A
+
+static const bfd_byte add_w_wreg_opcode[] =
+{
+ ADD_W_WREG_INSN_0, ADD_W_WREG_INSN_1
+};
+
+#define IS_ADD_W_WREG_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, add_w_wreg_opcode)
+
+#define SNC_INSN_0 0xA0
+#define SNC_INSN_1 0x0B
+
+static const bfd_byte snc_opcode[] =
+{
+ SNC_INSN_0, SNC_INSN_1
+};
+
+#define IS_SNC_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, snc_opcode)
+
+#define INC_1_SP_INSN_0 0x2B
+#define INC_1_SP_INSN_1 0x81
+
+static const bfd_byte inc_1_sp_opcode[] =
+{
+ INC_1_SP_INSN_0, INC_1_SP_INSN_1
+};
+
+#define IS_INC_1_SP_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, inc_1_sp_opcode)
+
+#define ADD_2_SP_W_INSN_0 0x1F
+#define ADD_2_SP_W_INSN_1 0x82
+
+static const bfd_byte add_2_sp_w_opcode[] =
+{
+ ADD_2_SP_W_INSN_0, ADD_2_SP_W_INSN_1
+};
+
+#define IS_ADD_2_SP_W_OPCODE(CODE0,CODE1) \
+ IS_OPCODE (CODE0, CODE1, add_2_sp_w_opcode)
+
+/* Relocation tables. */
+static reloc_howto_type ip2k_elf_howto_table [] =
+{
+#define IP2K_HOWTO(t,rs,s,bs,pr,bp,name,sm,dm) \
+ HOWTO(t, /* type */ \
+ rs, /* rightshift */ \
+ s, /* size (0 = byte, 1 = short, 2 = long) */ \
+ bs, /* bitsize */ \
+ pr, /* pc_relative */ \
+ bp, /* bitpos */ \
+ complain_overflow_dont,/* complain_on_overflow */ \
+ bfd_elf_generic_reloc,/* special_function */ \
+ name, /* name */ \
+ false, /* partial_inplace */ \
+ sm, /* src_mask */ \
+ dm, /* dst_mask */ \
+ pr) /* pcrel_offset */
+
+ /* This reloc does nothing. */
+ IP2K_HOWTO (R_IP2K_NONE, 0,2,32, false, 0, "R_IP2K_NONE", 0, 0),
+ /* A 16 bit absolute relocation. */
+ IP2K_HOWTO (R_IP2K_16, 0,1,16, false, 0, "R_IP2K_16", 0, 0xffff),
+ /* A 32 bit absolute relocation. */
+ IP2K_HOWTO (R_IP2K_32, 0,2,32, false, 0, "R_IP2K_32", 0, 0xffffffff),
+ /* A 8-bit data relocation for the FR9 field. Ninth bit is computed specially. */
+ IP2K_HOWTO (R_IP2K_FR9, 0,1,9, false, 0, "R_IP2K_FR9", 0, 0x00ff),
+ /* A 4-bit data relocation. */
+ IP2K_HOWTO (R_IP2K_BANK, 8,1,4, false, 0, "R_IP2K_BANK", 0, 0x000f),
+ /* A 13-bit insn relocation - word address => right-shift 1 bit extra. */
+ IP2K_HOWTO (R_IP2K_ADDR16CJP, 1,1,13, false, 0, "R_IP2K_ADDR16CJP", 0, 0x1fff),
+ /* A 3-bit insn relocation - word address => right-shift 1 bit extra. */
+ IP2K_HOWTO (R_IP2K_PAGE3, 14,1,3, false, 0, "R_IP2K_PAGE3", 0, 0x0007),
+ /* Two 8-bit data relocations. */
+ IP2K_HOWTO (R_IP2K_LO8DATA, 0,1,8, false, 0, "R_IP2K_LO8DATA", 0, 0x00ff),
+ IP2K_HOWTO (R_IP2K_HI8DATA, 8,1,8, false, 0, "R_IP2K_HI8DATA", 0, 0x00ff),
+ /* Two 8-bit insn relocations. word address => right-shift 1 bit extra. */
+ IP2K_HOWTO (R_IP2K_LO8INSN, 1,1,8, false, 0, "R_IP2K_LO8INSN", 0, 0x00ff),
+ IP2K_HOWTO (R_IP2K_HI8INSN, 9,1,8, false, 0, "R_IP2K_HI8INSN", 0, 0x00ff),
+
+ /* Special 1 bit relocation for SKIP instructions. */
+ IP2K_HOWTO (R_IP2K_PC_SKIP, 1,1,1, false, 12, "R_IP2K_PC_SKIP", 0xfffe, 0x1000),
+ /* 16 bit word address. */
+ IP2K_HOWTO (R_IP2K_TEXT, 1,1,16, false, 0, "R_IP2K_TEXT", 0, 0xffff),
+ /* A 7-bit offset relocation for the FR9 field. Eigth and ninth bit comes from insn. */
+ IP2K_HOWTO (R_IP2K_FR_OFFSET, 0,1,9, false, 0, "R_IP2K_FR_OFFSET", 0x180, 0x007f),
+ /* Bits 23:16 of an address. */
+ IP2K_HOWTO (R_IP2K_EX8DATA, 16,1,8, false, 0, "R_IP2K_EX8DATA", 0, 0x00ff),
+};
+
+
+/* Map BFD reloc types to IP2K ELF reloc types. */
+static reloc_howto_type *
+ip2k_reloc_type_lookup (abfd, code)
+ bfd * abfd ATTRIBUTE_UNUSED;
+ bfd_reloc_code_real_type code;
+{
+ /* Note that the ip2k_elf_howto_table is indxed by the R_
+ constants. Thus, the order that the howto records appear in the
+ table *must* match the order of the relocation types defined in
+ include/elf/ip2k.h. */
+
+ switch (code)
+ {
+ case BFD_RELOC_NONE:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_NONE];
+ case BFD_RELOC_16:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_16];
+ case BFD_RELOC_32:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_32];
+ case BFD_RELOC_IP2K_FR9:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_FR9];
+ case BFD_RELOC_IP2K_BANK:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_BANK];
+ case BFD_RELOC_IP2K_ADDR16CJP:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_ADDR16CJP];
+ case BFD_RELOC_IP2K_PAGE3:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_PAGE3];
+ case BFD_RELOC_IP2K_LO8DATA:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_LO8DATA];
+ case BFD_RELOC_IP2K_HI8DATA:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_HI8DATA];
+ case BFD_RELOC_IP2K_LO8INSN:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_LO8INSN];
+ case BFD_RELOC_IP2K_HI8INSN:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_HI8INSN];
+ case BFD_RELOC_IP2K_PC_SKIP:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_PC_SKIP];
+ case BFD_RELOC_IP2K_TEXT:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_TEXT];
+ case BFD_RELOC_IP2K_FR_OFFSET:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_FR_OFFSET];
+ case BFD_RELOC_IP2K_EX8DATA:
+ return &ip2k_elf_howto_table[ (int) R_IP2K_EX8DATA];
+ default:
+ /* Pacify gcc -Wall. */
+ return NULL;
+ }
+ return NULL;
+}
+
+#define PAGENO(ABSADDR) ((ABSADDR) & 0x1C000)
+#define BASEADDR(SEC) ((SEC)->output_section->vma + (SEC)->output_offset)
+
+#define UNDEFINED_SYMBOL (~(bfd_vma)0)
+
+/* Return the value of the symbol associated with the relocation IREL. */
+
+static bfd_vma
+symbol_value (abfd, symtab_hdr, extsyms, irel)
+ bfd *abfd;
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf32_External_Sym *extsyms;
+ Elf_Internal_Rela *irel;
+{
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf_External_Sym_Shndx *sym_shndx;
+ Elf_Internal_Shdr *shndx_hdr;
+ Elf_Internal_Sym isym;
+ asection *sym_sec;
+
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ sym_shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ sym_shndx = sym_shndx ? sym_shndx + ELF32_R_SYM (irel->r_info) : NULL;
+ bfd_elf32_swap_symbol_in (abfd, extsyms + ELF32_R_SYM (irel->r_info),
+ sym_shndx, &isym);
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+ else
+ sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+
+ return isym.st_value + BASEADDR (sym_sec);
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = elf_sym_hashes (abfd)[indx];
+ BFD_ASSERT (h != NULL);
+
+ if (h->root.type != bfd_link_hash_defined
+ && h->root.type != bfd_link_hash_defweak)
+ return UNDEFINED_SYMBOL;
+
+ return (h->root.u.def.value + BASEADDR (h->root.u.def.section));
+ }
+}
+
+/* Determine if the instruction sequence matches that for
+ the prologue of a switch dispatch table with fewer than
+ 128 entries.
+
+ sc
+ page $nnn0
+ jmp $nnn0
+ add w,wreg
+ add pcl,w
+ addr=>
+ page $nnn1
+ jmp $nnn1
+ page $nnn2
+ jmp $nnn2
+ ...
+ page $nnnN
+ jmp $nnnN
+
+ After relaxation.
+ sc
+ page $nnn0
+ jmp $nnn0
+ add pcl,w
+ addr=>
+ jmp $nnn1
+ jmp $nnn2
+ ...
+ jmp $nnnN */
+
+static boolean
+is_switch_128_dispatch_table_p (abfd, addr, relaxed, misc)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ bfd_vma addr;
+ boolean relaxed;
+ struct misc *misc;
+{
+ bfd_byte code0, code1;
+
+ if (addr < (3 * 2))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 2);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 1);
+
+ /* Is it ADD PCL,W */
+ if (! IS_ADD_PCL_W_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 4);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 3);
+
+ if (relaxed)
+ /* Is it ADD W,WREG */
+ return ! IS_ADD_W_WREG_OPCODE (code0, code1);
+
+ else
+ {
+ /* Is it ADD W,WREG */
+ if (! IS_ADD_W_WREG_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 6);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 5);
+
+ /* Is it JMP $nnnn */
+ if (! IS_JMP_OPCODE (code0, code1))
+ return false;
+ }
+
+ /* It looks like we've found the prologue for
+ a 1-127 entry switch dispatch table. */
+ return true;
+}
+
+/* Determine if the instruction sequence matches that for
+ the prologue switch dispatch table with fewer than
+ 256 entries but more than 127.
+
+ Before relaxation.
+ push %lo8insn(label) ; Push address of table
+ push %hi8insn(label)
+ add w,wreg ; index*2 => offset
+ snc ; CARRY SET?
+ inc 1(sp) ; Propagate MSB into table address
+ add 2(sp),w ; Add low bits of offset to table address
+ snc ; and handle any carry-out
+ inc 1(sp)
+ addr=>
+ page __indjmp ; Do an indirect jump to that location
+ jmp __indjmp
+ label: ; case dispatch table starts here
+ page $nnn1
+ jmp $nnn1
+ page $nnn2
+ jmp $nnn2
+ ...
+ page $nnnN
+ jmp $nnnN
+
+ After relaxation.
+ push %lo8insn(label) ; Push address of table
+ push %hi8insn(label)
+ add 2(sp),w ; Add low bits of offset to table address
+ snc ; and handle any carry-out
+ inc 1(sp)
+ addr=>
+ page __indjmp ; Do an indirect jump to that location
+ jmp __indjmp
+ label: ; case dispatch table starts here
+ jmp $nnn1
+ jmp $nnn2
+ ...
+ jmp $nnnN */
+
+static boolean
+is_switch_256_dispatch_table_p (abfd, addr, relaxed, misc)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ bfd_vma addr;
+ boolean relaxed;
+ struct misc *misc;
+{
+ bfd_byte code0, code1;
+
+ if (addr < (8 * 2))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 2);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 1);
+
+ /* Is it INC 1(SP). */
+ if (! IS_INC_1_SP_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 4);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 3);
+
+ /* Is it SNC. */
+ if (! IS_SNC_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 6);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 5);
+
+ /* Is it ADD 2(SP),W. */
+ if (! IS_ADD_2_SP_W_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 8);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 7);
+
+ if (relaxed)
+ /* Is it INC 1(SP). */
+ return ! IS_INC_1_SP_OPCODE (code0, code1);
+
+ else
+ {
+ /* Is it INC 1(SP). */
+ if (! IS_INC_1_SP_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 10);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 9);
+
+ /* Is it SNC. */
+ if (! IS_SNC_OPCODE (code0, code1))
+ return false;
+
+ code0 = bfd_get_8 (abfd, misc->contents + addr - 12);
+ code1 = bfd_get_8 (abfd, misc->contents + addr - 11);
+
+ /* Is it ADD W,WREG. */
+ if (! IS_ADD_W_WREG_OPCODE (code0, code1))
+ return false;
+ }
+
+ /* It looks like we've found the prologue for
+ a 128-255 entry switch dispatch table. */
+ return true;
+}
+
+static boolean
+relax_switch_dispatch_tables_pass1 (abfd, sec, addr, misc)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ struct misc *misc;
+{
+ if (addr + 3 < sec->_cooked_size)
+ {
+ bfd_byte code0 = bfd_get_8 (abfd, misc->contents + addr + 2);
+ bfd_byte code1 = bfd_get_8 (abfd, misc->contents + addr + 3);
+
+ if (IS_JMP_OPCODE (code0, code1)
+ && is_switch_128_dispatch_table_p (abfd, addr, false, misc))
+ {
+ /* Delete ADD W,WREG from prologue. */
+ ip2k_elf_relax_delete_bytes (abfd, sec, addr - (2 * 2), (1 * 2));
+ return true;
+ }
+
+ if (IS_JMP_OPCODE (code0, code1)
+ && is_switch_256_dispatch_table_p (abfd, addr, false, misc))
+ {
+ /* Delete ADD W,WREG; SNC ; INC 1(SP) from prologue. */
+ ip2k_elf_relax_delete_bytes (abfd, sec, addr - 6 * 2, 3 * 2);
+ return true;
+ }
+ }
+
+ return true;
+}
+
+static boolean
+unrelax_dispatch_table_entries (abfd, sec, first, last, changed, misc)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma first;
+ bfd_vma last;
+ boolean *changed;
+ struct misc *misc;
+{
+ bfd_vma addr = first;
+
+ while (addr < last)
+ {
+ bfd_byte code0 = bfd_get_8 (abfd, misc->contents + addr);
+ bfd_byte code1 = bfd_get_8 (abfd, misc->contents + addr + 1);
+
+ /* We are only expecting to find PAGE or JMP insns
+ in the dispatch table. If we find anything else
+ something has gone wrong failed the relaxation
+ which will cause the link to be aborted. */
+
+ if (IS_PAGE_OPCODE (code0, code1))
+ /* Skip the PAGE and JMP insns. */
+ addr += 4;
+ else if (IS_JMP_OPCODE (code0, code1))
+ {
+ Elf_Internal_Rela * irelend = misc->irelbase
+ + sec->reloc_count;
+ Elf_Internal_Rela * irel;
+
+ /* Find the relocation entry. */
+ for (irel = misc->irelbase; irel < irelend; irel++)
+ {
+ if (irel->r_offset == addr
+ && ELF32_R_TYPE (irel->r_info) == R_IP2K_ADDR16CJP)
+ {
+ if (! add_page_insn (abfd, sec, irel, misc))
+ /* Something has gone wrong. */
+ return false;
+
+ *changed = true;
+ break;
+ }
+ }
+
+ /* If we fell off the end something has gone wrong. */
+ if (irel >= irelend)
+ /* Something has gone wrong. */
+ return false;
+
+ /* Skip the PAGE and JMP isns. */
+ addr += 4;
+ /* Acount for the new PAGE insn. */
+ last += 2;
+ }
+ else
+ /* Something has gone wrong. */
+ return false;
+ }
+
+ return true;
+}
+
+static boolean
+unrelax_switch_dispatch_tables_passN (abfd, sec, addr, changed, misc)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ boolean *changed;
+ struct misc *misc;
+{
+ if (2 <= addr && (addr + 3) < sec->_cooked_size)
+ {
+ bfd_byte code0 = bfd_get_8 (abfd, misc->contents + addr - 2);
+ bfd_byte code1 = bfd_get_8 (abfd, misc->contents + addr - 1);
+
+ if (IS_PAGE_OPCODE (code0, code1))
+ {
+ addr -= 2;
+ code0 = bfd_get_8 (abfd, misc->contents + addr + 2);
+ code1 = bfd_get_8 (abfd, misc->contents + addr + 3);
+ }
+ else
+ {
+ code0 = bfd_get_8 (abfd, misc->contents + addr);
+ code1 = bfd_get_8 (abfd, misc->contents + addr + 1);
+ }
+
+ if (IS_JMP_OPCODE (code0, code1)
+ && is_switch_128_dispatch_table_p (abfd, addr, true, misc))
+ {
+ bfd_vma first = addr;
+ bfd_vma last = first;
+ boolean relaxed = true;
+
+ /* On the final pass we must check if *all* entries in the
+ dispatch table are relaxed. If *any* are not relaxed
+ then we must unrelax *all* the entries in the dispach
+ table and also unrelax the dispatch table prologue. */
+
+ /* Find the last entry in the dispach table. */
+ while (last < sec->_cooked_size)
+ {
+ code0 = bfd_get_8 (abfd, misc->contents + last);
+ code1 = bfd_get_8 (abfd, misc->contents + last + 1);
+
+ if (IS_PAGE_OPCODE (code0, code1))
+ relaxed = false;
+ else if (! IS_JMP_OPCODE (code0, code1))
+ break;
+
+ last += 2;
+ }
+
+ /* We should have found the end of the dispatch table
+ before reaching the end of the section. If we've have
+ reached the end then fail the relaxation which will
+ cause the link to be aborted. */
+ if (last >= sec->_cooked_size)
+ /* Something has gone wrong. */
+ return false;
+
+ /* If we found an unrelaxed entry then
+ unlrelax all the switch table entries. */
+ if (! relaxed )
+ {
+ if (! unrelax_dispatch_table_entries (abfd, sec, first,
+ last, changed, misc))
+ /* Something has gone wrong. */
+ return false;
+
+ if (! is_switch_128_dispatch_table_p (abfd, addr, true, misc))
+ /* Something has gone wrong. */
+ return false;
+
+ /* Unrelax the prologue. */
+
+ /* Insert an ADD W,WREG insnstruction. */
+ if (! ip2k_elf_relax_add_bytes (abfd, sec,
+ addr - 2,
+ add_w_wreg_opcode,
+ sizeof (add_w_wreg_opcode),
+ 0))
+ /* Something has gone wrong. */
+ return false;
+ }
+
+ return true;
+ }
+
+ if (IS_JMP_OPCODE (code0, code1)
+ && is_switch_256_dispatch_table_p (abfd, addr, true, misc))
+ {
+ bfd_vma first = addr;
+ bfd_vma last;
+ boolean relaxed = true;
+
+ /* On the final pass we must check if *all* entries in the
+ dispatch table are relaxed. If *any* are not relaxed
+ then we must unrelax *all* the entries in the dispach
+ table and also unrelax the dispatch table prologue. */
+
+ /* Note the 1st PAGE/JMP instructions are part of the
+ prologue and can safely be relaxed. */
+
+ code0 = bfd_get_8 (abfd, misc->contents + first);
+ code1 = bfd_get_8 (abfd, misc->contents + first + 1);
+
+ if (IS_PAGE_OPCODE (code0, code1))
+ {
+ first += 2;
+ code0 = bfd_get_8 (abfd, misc->contents + first);
+ code1 = bfd_get_8 (abfd, misc->contents + first + 1);
+ }
+
+ if (! IS_JMP_OPCODE (code0, code1))
+ /* Something has gone wrong. */
+ return false;
+
+ first += 2;
+ last = first;
+
+ /* Find the last entry in the dispach table. */
+ while (last < sec->_cooked_size)
+ {
+ code0 = bfd_get_8 (abfd, misc->contents + last);
+ code1 = bfd_get_8 (abfd, misc->contents + last + 1);
+
+ if (IS_PAGE_OPCODE (code0, code1))
+ relaxed = false;
+ else if (! IS_JMP_OPCODE (code0, code1))
+ break;
+
+ last += 2;
+ }
+
+ /* We should have found the end of the dispatch table
+ before reaching the end of the section. If we have
+ reached the end of the section then fail the
+ relaxation. */
+ if (last >= sec->_cooked_size)
+ return false;
+
+ /* If we found an unrelaxed entry then
+ unrelax all the switch table entries. */
+ if (! relaxed)
+ {
+ if (! unrelax_dispatch_table_entries (abfd, sec, first,
+ last, changed, misc))
+ return false;
+
+ if (! is_switch_256_dispatch_table_p (abfd, addr, true, misc))
+ return false;
+
+ /* Unrelax the prologue. */
+
+ /* Insert an INC 1(SP) insnstruction. */
+ if (! ip2k_elf_relax_add_bytes (abfd, sec,
+ addr - 6,
+ inc_1_sp_opcode,
+ sizeof (inc_1_sp_opcode),
+ 0))
+ return false;
+
+ /* Insert an SNC insnstruction. */
+ if (! ip2k_elf_relax_add_bytes (abfd, sec,
+ addr - 6,
+ snc_opcode,
+ sizeof (snc_opcode),
+ 0))
+ return false;
+
+ /* Insert an ADD W,WREG insnstruction. */
+ if (! ip2k_elf_relax_add_bytes (abfd, sec,
+ addr - 6,
+ add_w_wreg_opcode,
+ sizeof (add_w_wreg_opcode),
+ 0))
+ return false;
+ }
+
+ return true;
+ }
+ }
+
+ return true;
+}
+
+/* This function handles relaxing for the ip2k. */
+
+static boolean
+ip2k_elf_relax_section (abfd, sec, link_info, again)
+ bfd *abfd;
+ asection *sec;
+ struct bfd_link_info *link_info;
+ boolean *again;
+{
+ Elf_External_Sym_Shndx *shndx_buf;
+ Elf_Internal_Shdr *shndx_hdr;
+ static asection * first_section = NULL;
+ static asection * last_section = NULL;
+ static boolean changed = false;
+ static boolean final_pass = false;
+ static unsigned int pass = 0;
+ struct misc misc;
+ asection *stab;
+
+ /* Assume nothing changes. */
+ *again = false;
+
+ if (first_section == NULL)
+ first_section = sec;
+
+ if (first_section == sec)
+ {
+ changed = false;
+ pass++;
+ }
+
+ /* If we make too many passes then it's a sign that
+ something is wrong and we fail the relaxation.
+ Note if everything is working correctly then the
+ relaxation should converge reasonably quickly. */
+ if (pass == 4096)
+ return false;
+
+ /* We don't have to do anything for a relocatable link,
+ if this section does not have relocs, or if this is
+ not a code section. */
+ if (link_info->relocateable
+ || (sec->flags & SEC_RELOC) == 0
+ || sec->reloc_count == 0
+ || (sec->flags & SEC_CODE) == 0)
+ return true;
+
+ if (pass == 1)
+ last_section = sec;
+
+ misc.symtab_hdr = NULL;
+ misc.irelbase = NULL;
+ misc.contents = NULL;
+ misc.free_contents = NULL;
+ misc.extsyms = NULL;
+ misc.free_extsyms = NULL;
+ misc.free_relocs = NULL;
+
+ /* If this is the first time we have been called
+ for this section, initialise the cooked size. */
+ if (sec->_cooked_size == 0)
+ sec->_cooked_size = sec->_raw_size;
+
+ misc.symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+
+ misc.irelbase = _bfd_elf32_link_read_relocs (abfd, sec, NULL,
+ (Elf_Internal_Rela *)NULL,
+ link_info->keep_memory);
+ if (misc.irelbase == NULL)
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+
+ if (! link_info->keep_memory)
+ misc.free_relocs = misc.irelbase;
+
+ /* Make sure the stac.rela stuff gets read in. */
+ stab = bfd_get_section_by_name (abfd, ".stab");
+
+ if (stab)
+ {
+ /* So stab does exits. */
+ Elf_Internal_Rela * irelbase;
+
+ irelbase = _bfd_elf32_link_read_relocs (abfd, stab, NULL,
+ (Elf_Internal_Rela *)NULL,
+ link_info->keep_memory);
+ }
+
+ /* Get section contents cached copy if it exists. */
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ misc.contents = elf_section_data (sec)->this_hdr.contents;
+ else
+ {
+ /* Go get them of disk. */
+ misc.contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
+ if (misc.contents == NULL)
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+
+ misc.free_contents = misc.contents;
+ if (! bfd_get_section_contents (abfd, sec, misc.contents,
+ (file_ptr)0,
+ sec->_raw_size))
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+ }
+
+ /* Read this BFD's symbols cached copy if it exists. */
+ if (misc.symtab_hdr->contents != NULL)
+ misc.extsyms = (Elf32_External_Sym *) misc.symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ misc.extsyms = ((Elf32_External_Sym *)bfd_malloc (misc.symtab_hdr->sh_size));
+ if (misc.extsyms == NULL)
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+
+ misc.free_extsyms = misc.extsyms;
+ if (bfd_seek (abfd, misc.symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (misc.extsyms, 1, misc.symtab_hdr->sh_size, abfd)
+ != misc.symtab_hdr->sh_size))
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+ }
+
+ if (shndx_hdr->sh_size != 0)
+ {
+ bfd_size_type amt;
+
+ amt = misc.symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
+ shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
+ if (shndx_buf == NULL)
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+ if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
+ || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+ shndx_hdr->contents = (PTR) shndx_buf;
+ }
+
+ /* This is where all the relaxation actually get done. */
+
+ if (pass == 1)
+ {
+ /* On the first pass we remove *all* page instructions and
+ relax the prolog for switch dispatch tables. This gets
+ us to the starting point for subsequent passes where
+ we add page instructions back in as needed. */
+
+ if (! ip2k_elf_relax_section_pass1 (abfd, sec, again, &misc))
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+
+ changed |= *again;
+ }
+ else
+ {
+ /* Add page instructions back in as needed but we ignore
+ the issue with sections (functions) crossing a page
+ boundary until we have converged to an approximate
+ solution (i.e. nothing has changed on this relaxation
+ pass) and we then know roughly where the page boundaries
+ will end up.
+
+ After we have have converged to an approximate solution
+ we set the final pass flag and continue relaxing. On these
+ final passes if a section (function) cross page boundary
+ we will add *all* the page instructions back into such
+ sections.
+
+ After adding *all* page instructions back into a section
+ which crosses a page bounbdary we reset the final pass flag
+ so the we will again interate until we find a new approximate
+ solution which is closer to the final solution. */
+
+ if (! ip2k_elf_relax_section_passN (abfd, sec, again,
+ &final_pass, &misc))
+ {
+ tidyup_after_error (&misc);
+ return false;
+ }
+
+ changed |= *again;
+
+ /* If nothing has changed on this relaxation
+ pass restart the final relaxaton pass. */
+ if (! changed && last_section == sec)
+ {
+ /* If this was the final pass and we didn't reset
+ the final pass flag then we are done, otherwise
+ do another final pass. */
+ if (! final_pass)
+ {
+ final_pass = true;
+ *again = true;
+ }
+ }
+ }
+
+ /* Perform some house keeping after relaxing the section. */
+
+ if (misc.free_relocs != NULL)
+ {
+ free (misc.free_relocs);
+ misc.free_relocs = NULL;
+ }
+
+ if (misc.free_contents != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (misc.free_contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = misc.contents;
+ }
+
+ misc.free_contents = NULL;
+ }
+
+ if (misc.free_extsyms != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (misc.free_extsyms);
+ else
+ {
+ /* Cache the symbols for elf_link_input_bfd. */
+ misc.symtab_hdr->contents = misc.extsyms;
+ }
+
+ misc.free_extsyms = NULL;
+ }
+
+ return true;
+}
+
+static void
+tidyup_after_error (misc)
+ struct misc *misc;
+{
+ if (misc->free_relocs != NULL)
+ {
+ free (misc->free_relocs);
+ misc->free_relocs = NULL;
+ }
+
+ if (misc->free_contents != NULL)
+ {
+ free (misc->free_contents);
+ misc->free_contents = NULL;
+ }
+
+ if (misc->free_extsyms != NULL)
+ {
+ free (misc->free_extsyms);
+ misc->free_extsyms = NULL;
+ }
+
+ return;
+}
+
+/* This function handles relaxation during the first pass. */
+
+static boolean
+ip2k_elf_relax_section_pass1 (abfd, sec, again, misc)
+ bfd *abfd;
+ asection *sec;
+ boolean *again;
+ struct misc * misc;
+{
+ Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count;
+ Elf_Internal_Rela *irel;
+
+ /* Walk thru the section looking for relaxation opertunities. */
+ for (irel = misc->irelbase; irel < irelend; irel++)
+ {
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_IP2K_PAGE3)
+ {
+ bfd_byte code0 = bfd_get_8 (abfd,
+ misc->contents + irel->r_offset);
+ bfd_byte code1 = bfd_get_8 (abfd,
+ misc->contents + irel->r_offset + 1);
+
+ /* Verify that this is the PAGE opcode. */
+ if (IS_PAGE_OPCODE (code0, code1))
+ {
+ /* Note that we've changed the relocs, section contents, etc. */
+ elf_section_data (sec)->relocs = misc->irelbase;
+ misc->free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = misc->contents;
+ misc->free_contents = NULL;
+
+ misc->symtab_hdr->contents = (bfd_byte *) misc->extsyms;
+ misc->free_extsyms = NULL;
+
+ /* Handle switch dispatch tables/prologues. */
+ if (! relax_switch_dispatch_tables_pass1 (abfd, sec,
+ irel->r_offset, misc))
+ return false;
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_IP2K_NONE);
+
+ /* Delete the PAGE insn. */
+ if (! ip2k_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset,
+ sizeof (page_opcode)))
+ return false;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ }
+ }
+
+ return true;
+}
+
+/* This function handles relaxation for 2nd and subsequent passes. */
+
+static boolean
+ip2k_elf_relax_section_passN (abfd, sec, again, final_pass, misc)
+ bfd *abfd;
+ asection *sec;
+ boolean *again;
+ boolean *final_pass;
+ struct misc * misc;
+{
+ Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count;
+ Elf_Internal_Rela *irel;
+ boolean add_all;
+
+ /* If we are on the final relaxation pass and the section crosses
+ then set a flag to indicate that *all* page instructions need
+ to be added back into this section. */
+ if (*final_pass)
+ {
+ add_all = (PAGENO (BASEADDR (sec))
+ != PAGENO (BASEADDR (sec) + sec->_cooked_size));
+
+ /* If this section crosses a page boundary set the crossed
+ page boundary flag. */
+ if (add_all)
+ sec->userdata = sec;
+ else
+ {
+ /* If the section had previously crossed a page boundary
+ but on this pass does not then reset crossed page
+ boundary flag and rerun the 1st relaxation pass on
+ this section. */
+ if (sec->userdata)
+ {
+ sec->userdata = NULL;
+ if (! ip2k_elf_relax_section_pass1 (abfd, sec, again, misc))
+ return false;
+ }
+ }
+ }
+ else
+ add_all = false;
+
+ /* Walk thru the section looking for call/jmp
+ instructions which need a page instruction. */
+ for (irel = misc->irelbase; irel < irelend; irel++)
+ {
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_IP2K_ADDR16CJP)
+ {
+ /* Get the value of the symbol referred to by the reloc. */
+ bfd_vma symval = symbol_value (abfd, misc->symtab_hdr, misc->extsyms,
+ irel);
+ bfd_byte code0, code1;
+
+ if (symval == UNDEFINED_SYMBOL)
+ {
+ /* This appears to be a reference to an undefined
+ symbol. Just ignore it--it will be caught by the
+ regular reloc processing. */
+ continue;
+ }
+
+ /* For simplicity of coding, we are going to modify the section
+ contents, the section relocs, and the BFD symbol table. We
+ must tell the rest of the code not to free up this
+ information. It would be possible to instead create a table
+ of changes which have to be made, as is done in coff-mips.c;
+ that would be more work, but would require less memory when
+ the linker is run. */
+
+ /* Get the opcode. */
+ code0 = bfd_get_8 (abfd, misc->contents + irel->r_offset);
+ code1 = bfd_get_8 (abfd, misc->contents + irel->r_offset + 1);
+
+ if (IS_JMP_OPCODE (code0, code1) || IS_CALL_OPCODE (code0, code1))
+ {
+ if (*final_pass)
+ {
+ if (! unrelax_switch_dispatch_tables_passN (abfd, sec,
+ irel->r_offset,
+ again, misc))
+ return false;
+
+ if (*again)
+ add_all = false;
+ }
+
+ code0 = bfd_get_8 (abfd, misc->contents + irel->r_offset - 2);
+ code1 = bfd_get_8 (abfd, misc->contents + irel->r_offset - 1);
+
+ if (! IS_PAGE_OPCODE (code0, code1))
+ {
+ bfd_vma value = symval + irel->r_addend;
+ bfd_vma addr = BASEADDR (sec) + irel->r_offset;
+
+ if (add_all || PAGENO (addr) != PAGENO (value))
+ {
+ if (! add_page_insn (abfd, sec, irel, misc))
+ return false;
+
+ /* That will have changed things, so, we must relax again. */
+ *again = true;
+ }
+ }
+ }
+ }
+ }
+
+ /* If anything changed reset the final pass flag. */
+ if (*again)
+ *final_pass = false;
+
+ return true;
+}
+
+/* Parts of a Stabs entry. */
+
+#define STRDXOFF (0)
+#define TYPEOFF (4)
+#define OTHEROFF (5)
+#define DESCOFF (6)
+#define VALOFF (8)
+#define STABSIZE (12)
+
+/* Adjust all the relocations entries after adding or inserting instructions. */
+
+static void
+adjust_all_relocations (abfd, sec, addr, endaddr, count, noadj)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ bfd_vma endaddr;
+ int count;
+ int noadj;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf32_External_Sym *extsyms;
+ int shndx, index;
+ bfd_byte *contents;
+ Elf_Internal_Rela *irel, *irelend, *irelbase;
+ Elf32_External_Sym *esym, *esymend;
+ asection *stab;
+ bfd_byte *stabp, *stabend, *stabcontents;
+ Elf_Internal_Shdr *shndx_hdr;
+ Elf_External_Sym_Shndx *sym_shndx;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+
+ shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+ contents = elf_section_data (sec)->this_hdr.contents;
+
+ irelbase = elf_section_data (sec)->relocs;
+ irelend = irelbase + sec->reloc_count;
+
+ for (irel = irelbase; irel < irelend; irel++)
+ {
+ if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE)
+ {
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf_Internal_Sym isym;
+ asection *sym_sec;
+ Elf_External_Sym_Shndx *sym_shndx;
+ Elf_Internal_Shdr *shndx_hdr;
+
+ /* A local symbol. */
+
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ sym_shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ sym_shndx = (sym_shndx
+ ? sym_shndx + ELF32_R_SYM (irel->r_info) : NULL);
+ bfd_elf32_swap_symbol_in (abfd,
+ extsyms + ELF32_R_SYM (irel->r_info),
+ sym_shndx, &isym);
+
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+ else
+ sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+
+ if (sym_sec == sec)
+ {
+ bfd_vma baseaddr = BASEADDR (sec);
+ bfd_vma symval = BASEADDR (sym_sec) + isym.st_value
+ + irel->r_addend;
+
+ if ((baseaddr + addr + noadj) <= symval
+ && symval < (baseaddr + endaddr))
+ irel->r_addend += count;
+ }
+ }
+ }
+
+ /* Do this only for PC space relocations. */
+ if (addr <= irel->r_offset && irel->r_offset < endaddr)
+ irel->r_offset += count;
+ }
+
+ /* Now fix the stab relocations. */
+ stab = bfd_get_section_by_name (abfd, ".stab");
+ if (stab)
+ {
+ irelbase = elf_section_data (stab)->relocs;
+ irelend = irelbase + stab->reloc_count;
+
+ /* Pull out the contents of the stab section. */
+ if (elf_section_data (stab)->this_hdr.contents != NULL)
+ stabcontents = elf_section_data (stab)->this_hdr.contents;
+ else
+ {
+ stabcontents = (bfd_byte *) bfd_alloc (abfd, stab->_raw_size);
+ if (stabcontents == NULL)
+ return;
+ if (! bfd_get_section_contents (abfd, stab, stabcontents,
+ (file_ptr) 0, stab->_raw_size))
+ return;
+
+ /* We need to remember this. */
+ elf_section_data (stab)->this_hdr.contents = stabcontents;
+ }
+
+ stabend = stabcontents + stab->_raw_size;
+
+ for (irel = irelbase; irel < irelend; irel++)
+ {
+ if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE)
+ {
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf_Internal_Sym isym;
+ asection *sym_sec;
+ Elf_External_Sym_Shndx *sym_shndx;
+ Elf_Internal_Shdr *shndx_hdr;
+
+ /* A local symbol. */
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ sym_shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ sym_shndx = (sym_shndx
+ ? sym_shndx + ELF32_R_SYM (irel->r_info)
+ : NULL);
+
+ bfd_elf32_swap_symbol_in (abfd,
+ (extsyms
+ + ELF32_R_SYM (irel->r_info)),
+ sym_shndx, &isym);
+
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+ else
+ sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+
+ if (sym_sec == sec)
+ {
+ const char *name;
+ unsigned long strx;
+ unsigned char type, other;
+ unsigned short desc;
+ bfd_vma value;
+ bfd_vma baseaddr = BASEADDR (sec);
+ bfd_vma symval = BASEADDR (sym_sec) + isym.st_value
+ + irel->r_addend;
+
+ if ((baseaddr + addr) <= symval
+ && symval <= (baseaddr + endaddr))
+ irel->r_addend += count;
+
+ /* Go hunt up a function and fix its line info if needed. */
+ stabp = stabcontents + irel->r_offset - 8;
+
+ /* Go pullout the stab entry. */
+ strx = bfd_h_get_32 (abfd, stabp + STRDXOFF);
+ type = bfd_h_get_8 (abfd, stabp + TYPEOFF);
+ other = bfd_h_get_8 (abfd, stabp + OTHEROFF);
+ desc = bfd_h_get_16 (abfd, stabp + DESCOFF);
+ value = bfd_h_get_32 (abfd, stabp + VALOFF);
+
+ name = bfd_get_stab_name (type);
+
+ if (strcmp (name, "FUN") == 0)
+ {
+ int function_adjusted = 0;
+
+ if (symval > (baseaddr + addr))
+ /* Not in this function. */
+ continue;
+
+ /* Hey we got a function hit. */
+ stabp += STABSIZE;
+ for (;stabp < stabend; stabp += STABSIZE)
+ {
+ /* Go pullout the stab entry. */
+ strx = bfd_h_get_32 (abfd, stabp + STRDXOFF);
+ type = bfd_h_get_8 (abfd, stabp + TYPEOFF);
+ other = bfd_h_get_8 (abfd, stabp + OTHEROFF);
+ desc = bfd_h_get_16 (abfd, stabp + DESCOFF);
+ value = bfd_h_get_32 (abfd, stabp + VALOFF);
+ name = bfd_get_stab_name (type);
+
+ if (strcmp (name, "FUN") == 0)
+ {
+ /* Hit another function entry. */
+ if (function_adjusted)
+ {
+ /* Adjust the value. */
+ value += count;
+
+ /* We need to put it back. */
+ bfd_h_put_32 (abfd, value,stabp + VALOFF);
+ }
+
+ /* And then bale out. */
+ break;
+ }
+
+ if (strcmp (name, "SLINE") == 0)
+ {
+ /* Got a line entry. */
+ if ((baseaddr + addr) <= (symval + value))
+ {
+ /* Adjust the line entry. */
+ value += count;
+
+ /* We need to put it back. */
+ bfd_h_put_32 (abfd, value,stabp + VALOFF);
+ function_adjusted = 1;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /* When adding an instruction back it is sometimes necessary to move any
+ global or local symbol that was referencing the first instruction of
+ the moved block to refer to the first instruction of the inserted block.
+
+ For example adding a PAGE instruction before a CALL or JMP requires
+ that any label on the CALL or JMP is moved to the PAGE insn. */
+ addr += noadj;
+
+ /* Adjust the local symbols defined in this section. */
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ sym_shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++, sym_shndx = (sym_shndx ? sym_shndx + 1: NULL))
+ {
+ Elf_Internal_Sym isym;
+ Elf_External_Sym_Shndx dummy;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, sym_shndx, &isym);
+
+ if (isym.st_shndx == shndx)
+ {
+ if (addr <= isym.st_value && isym.st_value < endaddr)
+ {
+ isym.st_value += count;
+ bfd_elf32_swap_symbol_out (abfd, &isym, esym, &dummy);
+ }
+ }
+ }
+
+ /* Now adjust the global symbols defined in this section. */
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ sym_shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ esym = extsyms + symtab_hdr->sh_info;
+ esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym));
+ for (index = 0; esym < esymend;
+ esym++, index++, sym_shndx = (sym_shndx ? sym_shndx + 1: NULL))
+ {
+ Elf_Internal_Sym isym;
+ struct elf_link_hash_entry *sym_hash;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, sym_shndx, &isym);
+ sym_hash = elf_sym_hashes (abfd)[index];
+
+ if (isym.st_shndx == shndx
+ && (sym_hash->root.type == bfd_link_hash_defined
+ || sym_hash->root.type == bfd_link_hash_defweak)
+ && sym_hash->root.u.def.section == sec)
+ {
+ if (addr <= sym_hash->root.u.def.value
+ && sym_hash->root.u.def.value < endaddr)
+ {
+ Elf_External_Sym_Shndx dummy;
+
+ sym_hash->root.u.def.value += count;
+ bfd_elf32_swap_symbol_out (abfd, &isym, esym, &dummy);
+ }
+ }
+ }
+
+ return;
+}
+
+static boolean
+add_page_insn (abfd, sec, irel, misc)
+ bfd *abfd;
+ asection *sec;
+ Elf_Internal_Rela *irel;
+ struct misc *misc;
+{
+ /* Note that we've changed the relocs, section contents, etc. */
+ elf_section_data (sec)->relocs = misc->irelbase;
+ misc->free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = misc->contents;
+ misc->free_contents = NULL;
+
+ misc->symtab_hdr->contents = (bfd_byte *) misc->extsyms;
+ misc->free_extsyms = NULL;
+
+ /* Add the PAGE insn. */
+ if (! ip2k_elf_relax_add_bytes (abfd, sec, irel->r_offset,
+ page_opcode,
+ sizeof (page_opcode),
+ sizeof (page_opcode)))
+ return false;
+ else
+ {
+ Elf32_Internal_Rela * jrel = irel - 1;
+
+ /* Add relocation for PAGE insn added. */
+ if (ELF32_R_TYPE (jrel->r_info) != R_IP2K_NONE)
+ {
+ bfd_byte code0, code1;
+ char *msg = NULL;
+
+ /* Get the opcode. */
+ code0 = bfd_get_8 (abfd, misc->contents + irel->r_offset);
+ code1 = bfd_get_8 (abfd, misc->contents + irel->r_offset + 1);
+
+ if (IS_JMP_OPCODE (code0, code1))
+ msg = "\tJMP instruction missing a preceeding PAGE instruction in %s\n\n";
+
+ else if (IS_CALL_OPCODE (code0, code1))
+ msg = "\tCALL instruction missing a preceeding PAGE instruction in %s\n\n";
+
+ if (msg)
+ {
+ fprintf (stderr, "\n\t *** LINKER RELAXATION failure ***\n");
+ fprintf (stderr, msg, sec->owner->filename);
+ }
+
+ return false;
+ }
+
+ jrel->r_addend = irel->r_addend;
+ jrel->r_offset = irel->r_offset - sizeof (page_opcode);
+ jrel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_IP2K_PAGE3);
+ }
+
+ return true;
+}
+
+/* Insert bytes into a section while relaxing. */
+
+static boolean
+ip2k_elf_relax_add_bytes (abfd, sec, addr, bytes, count, noadj)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ const bfd_byte *bytes;
+ int count;
+ int noadj;
+{
+ bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
+ bfd_vma endaddr = sec->_cooked_size;
+
+ /* Make room to insert the bytes. */
+ memmove (contents + addr + count, contents + addr, endaddr - addr);
+
+ /* Insert the bytes into the section. */
+ memcpy (contents + addr, bytes, count);
+
+ sec->_cooked_size += count;
+
+ adjust_all_relocations (abfd, sec, addr, endaddr, count, noadj);
+ return true;
+}
+
+/* Delete some bytes from a section while relaxing. */
+
+static boolean
+ip2k_elf_relax_delete_bytes (abfd, sec, addr, count)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ int count;
+{
+ bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
+ bfd_vma endaddr = sec->_cooked_size;
+
+ /* Actually delete the bytes. */
+ memmove (contents + addr, contents + addr + count,
+ endaddr - addr - count);
+
+ sec->_cooked_size -= count;
+
+ adjust_all_relocations (abfd, sec, addr + count, endaddr, -count, 0);
+ return true;
+}
+
+/* -------------------------------------------------------------------- */
+
+/* XXX: The following code is the result of a cut&paste. This unfortunate
+ practice is very widespread in the various target back-end files. */
+
+/* Set the howto pointer for a IP2K ELF reloc. */
+
+static void
+ip2k_info_to_howto_rela (abfd, cache_ptr, dst)
+ bfd * abfd ATTRIBUTE_UNUSED;
+ arelent * cache_ptr;
+ Elf32_Internal_Rela * dst;
+{
+ unsigned int r_type;
+
+ r_type = ELF32_R_TYPE (dst->r_info);
+ switch (r_type)
+ {
+ default:
+ cache_ptr->howto = & ip2k_elf_howto_table [r_type];
+ break;
+ }
+}
+
+/* Perform a single relocation.
+ By default we use the standard BFD routines. */
+
+static bfd_reloc_status_type
+ip2k_final_link_relocate (howto, input_bfd, input_section, contents, rel,
+ relocation)
+ reloc_howto_type * howto;
+ bfd * input_bfd;
+ asection * input_section;
+ bfd_byte * contents;
+ Elf_Internal_Rela * rel;
+ bfd_vma relocation;
+{
+ bfd_reloc_status_type r = bfd_reloc_ok;
+
+ switch (howto->type)
+ {
+ /* Handle data space relocations. */
+ case R_IP2K_FR9:
+ case R_IP2K_BANK:
+ if ((relocation & IP2K_DATA_MASK) == IP2K_DATA_VALUE)
+ relocation &= ~IP2K_DATA_MASK;
+ else
+ r = bfd_reloc_notsupported;
+ break;
+
+ case R_IP2K_LO8DATA:
+ case R_IP2K_HI8DATA:
+ case R_IP2K_EX8DATA:
+ break;
+
+ /* Handle insn space relocations. */
+ case R_IP2K_ADDR16CJP:
+ case R_IP2K_PAGE3:
+ case R_IP2K_LO8INSN:
+ case R_IP2K_HI8INSN:
+ case R_IP2K_PC_SKIP:
+ if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE)
+ relocation &= ~IP2K_INSN_MASK;
+ else
+ r = bfd_reloc_notsupported;
+ break;
+
+ case R_IP2K_16:
+ /* If this is a relocation involving a TEXT
+ symbol, reduce it to a word address. */
+ if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE)
+ howto = &ip2k_elf_howto_table[ (int) R_IP2K_TEXT];
+ break;
+
+ /* Pass others through. */
+ default:
+ break;
+ }
+
+ /* Only install relocation if above tests did not disqualify it. */
+ if (r == bfd_reloc_ok)
+ r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
+
+ return r;
+}
+
+/* Relocate a IP2K ELF section.
+ There is some attempt to make this function usable for many architectures,
+ both USE_REL and USE_RELA ['twould be nice if such a critter existed],
+ if only to serve as a learning tool.
+
+ The RELOCATE_SECTION function is called by the new ELF backend linker
+ to handle the relocations for a section.
+
+ The relocs are always passed as Rela structures; if the section
+ actually uses Rel structures, the r_addend field will always be
+ zero.
+
+ This function is responsible for adjusting the section contents as
+ necessary, and (if using Rela relocs and generating a relocateable
+ output file) adjusting the reloc addend as necessary.
+
+ This function does not have to worry about setting the reloc
+ address or the reloc symbol index.
+
+ LOCAL_SYMS is a pointer to the swapped in local symbols.
+
+ LOCAL_SECTIONS is an array giving the section in the input file
+ corresponding to the st_shndx field of each local symbol.
+
+ The global hash table entry for the global symbols can be found
+ via elf_sym_hashes (input_bfd).
+
+ When generating relocateable output, this function must handle
+ STB_LOCAL/STT_SECTION symbols specially. The output symbol is
+ going to be the section symbol corresponding to the output
+ section, which means that the addend must be adjusted
+ accordingly. */
+
+static boolean
+ip2k_elf_relocate_section (output_bfd, info, input_bfd, input_section,
+ contents, relocs, local_syms, local_sections)
+ bfd * output_bfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info * info;
+ bfd * input_bfd;
+ asection * input_section;
+ bfd_byte * contents;
+ Elf_Internal_Rela * relocs;
+ Elf_Internal_Sym * local_syms;
+ asection ** local_sections;
+{
+ Elf_Internal_Shdr * symtab_hdr;
+ struct elf_link_hash_entry ** sym_hashes;
+ Elf_Internal_Rela * rel;
+ Elf_Internal_Rela * relend;
+
+ symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (input_bfd);
+ relend = relocs + input_section->reloc_count;
+
+ for (rel = relocs; rel < relend; rel ++)
+ {
+ reloc_howto_type * howto;
+ unsigned long r_symndx;
+ Elf_Internal_Sym * sym;
+ asection * sec;
+ struct elf_link_hash_entry * h;
+ bfd_vma relocation;
+ bfd_reloc_status_type r;
+ const char * name = NULL;
+ int r_type;
+
+ r_type = ELF32_R_TYPE (rel->r_info);
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+
+ if (info->relocateable)
+ {
+ /* This is a relocateable link. We don't have to change
+ anything, unless the reloc is against a section symbol,
+ in which case we have to adjust according to where the
+ section symbol winds up in the output section. */
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+
+ if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
+ {
+ sec = local_sections [r_symndx];
+ rel->r_addend += sec->output_offset + sym->st_value;
+ }
+ }
+
+ continue;
+ }
+
+ /* This is a final link. */
+ howto = ip2k_elf_howto_table + ELF32_R_TYPE (rel->r_info);
+ h = NULL;
+ sym = NULL;
+ sec = NULL;
+
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+ sec = local_sections [r_symndx];
+ relocation = BASEADDR (sec) + sym->st_value;
+
+ name = bfd_elf_string_from_elf_section
+ (input_bfd, symtab_hdr->sh_link, sym->st_name);
+ name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
+ }
+ else
+ {
+ h = sym_hashes [r_symndx - symtab_hdr->sh_info];
+
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ name = h->root.root.string;
+
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ sec = h->root.u.def.section;
+ relocation = h->root.u.def.value + BASEADDR (sec);
+ }
+ else if (h->root.type == bfd_link_hash_undefweak)
+ {
+ relocation = 0;
+ }
+ else
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd,
+ input_section, rel->r_offset,
+ (! info->shared || info->no_undefined))))
+ return false;
+ relocation = 0;
+ }
+ }
+
+ /* Finally, the sole IP2K-specific part. */
+ r = ip2k_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel, relocation);
+
+ if (r != bfd_reloc_ok)
+ {
+ const char * msg = (const char *) NULL;
+
+ switch (r)
+ {
+ case bfd_reloc_overflow:
+ r = info->callbacks->reloc_overflow
+ (info, name, howto->name, (bfd_vma) 0,
+ input_bfd, input_section, rel->r_offset);
+ break;
+
+ case bfd_reloc_undefined:
+ r = info->callbacks->undefined_symbol
+ (info, name, input_bfd, input_section, rel->r_offset, true);
+ break;
+
+ case bfd_reloc_outofrange:
+ msg = _("internal error: out of range error");
+ break;
+
+ /* This is how ip2k_final_link_relocate tells us of a non-kosher
+ reference between insn & data address spaces. */
+ case bfd_reloc_notsupported:
+ if (sym != NULL) /* Only if it's not an unresolved symbol. */
+ msg = _("unsupported relocation between data/insn address spaces");
+ break;
+
+ case bfd_reloc_dangerous:
+ msg = _("internal error: dangerous relocation");
+ break;
+
+ default:
+ msg = _("internal error: unknown error");
+ break;
+ }
+
+ if (msg)
+ r = info->callbacks->warning
+ (info, msg, name, input_bfd, input_section, rel->r_offset);
+
+ if (! r)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static asection *
+ip2k_elf_gc_mark_hook (sec, info, rel, h, sym)
+ asection *sec;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ Elf_Internal_Rela *rel;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+{
+ if (h != NULL)
+ {
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+#if 0
+ case R_IP2K_GNU_VTINHERIT:
+ case R_IP2K_GNU_VTENTRY:
+ break;
+#endif
+
+ default:
+ switch (h->root.type)
+ {
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
+ default:
+ break;
+ }
+ }
+ }
+ else
+ {
+ if (!(elf_bad_symtab (sec->owner)
+ && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
+ && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
+ && sym->st_shndx != SHN_COMMON))
+ {
+ return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+ }
+ }
+ return NULL;
+}
+
+static boolean
+ip2k_elf_gc_sweep_hook (abfd, info, sec, relocs)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ asection *sec ATTRIBUTE_UNUSED;
+ const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
+{
+ /* we don't use got and plt entries for ip2k */
+ return true;
+}
+
+
+/* -------------------------------------------------------------------- */
+
+
+#define TARGET_BIG_SYM bfd_elf32_ip2k_vec
+#define TARGET_BIG_NAME "elf32-ip2k"
+
+#define ELF_ARCH bfd_arch_ip2k
+#define ELF_MACHINE_CODE EM_IP2K
+#define ELF_MAXPAGESIZE 1 /* No pages on the IP2K */
+
+#undef USE_REL
+#define USE_RELA
+
+#define elf_info_to_howto_rel NULL
+#define elf_info_to_howto ip2k_info_to_howto_rela
+
+#define elf_backend_can_gc_sections 1
+#define elf_backend_gc_mark_hook ip2k_elf_gc_mark_hook
+#define elf_backend_gc_sweep_hook ip2k_elf_gc_sweep_hook
+
+#define elf_backend_relocate_section ip2k_elf_relocate_section
+
+#define elf_symbol_leading_char '_'
+#define bfd_elf32_bfd_reloc_type_lookup ip2k_reloc_type_lookup
+#define bfd_elf32_bfd_relax_section ip2k_elf_relax_section
+
+
+#include "elf32-target.h"
+
projects / binutils-gdb.git / commitdiff