| /* Ubicom IP2xxx specific support for 32-bit ELF |
| Copyright (C) 2000-2024 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #include "sysdep.h" |
| #include "bfd.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; |
| Elf_Internal_Sym * isymbuf; |
| }; |
| |
| struct ip2k_opcode |
| { |
| unsigned short opcode; |
| unsigned short mask; |
| }; |
| |
| static bool ip2k_relaxed = false; |
| |
| static const struct ip2k_opcode ip2k_page_opcode[] = |
| { |
| {0x0010, 0xFFF8}, /* Page. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_PAGE_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_page_opcode) |
| |
| static const struct ip2k_opcode ip2k_jmp_opcode[] = |
| { |
| {0xE000, 0xE000}, /* Jmp. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_JMP_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_jmp_opcode) |
| |
| static const struct ip2k_opcode ip2k_snc_opcode[] = |
| { |
| {0xA00B, 0xFFFF}, /* Snc. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_SNC_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_snc_opcode) |
| |
| static const struct ip2k_opcode ip2k_inc_1sp_opcode[] = |
| { |
| {0x2B81, 0xFFFF}, /* Inc 1(SP). */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_INC_1SP_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_inc_1sp_opcode) |
| |
| static const struct ip2k_opcode ip2k_add_2sp_w_opcode[] = |
| { |
| {0x1F82, 0xFFFF}, /* Add 2(SP),w. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_ADD_2SP_W_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_add_2sp_w_opcode) |
| |
| static const struct ip2k_opcode ip2k_add_w_wreg_opcode[] = |
| { |
| {0x1C0A, 0xFFFF}, /* Add w,wreg. */ |
| {0x1E0A, 0xFFFF}, /* Add wreg,w. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_ADD_W_WREG_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_add_w_wreg_opcode) |
| |
| static const struct ip2k_opcode ip2k_add_pcl_w_opcode[] = |
| { |
| {0x1E09, 0xFFFF}, /* Add pcl,w. */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_ADD_PCL_W_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_add_pcl_w_opcode) |
| |
| static const struct ip2k_opcode ip2k_skip_opcodes[] = |
| { |
| {0xB000, 0xF000}, /* sb */ |
| {0xA000, 0xF000}, /* snb */ |
| {0x7600, 0xFE00}, /* cse/csne #lit */ |
| {0x5800, 0xFC00}, /* incsnz */ |
| {0x4C00, 0xFC00}, /* decsnz */ |
| {0x4000, 0xFC00}, /* cse/csne */ |
| {0x3C00, 0xFC00}, /* incsz */ |
| {0x2C00, 0xFC00}, /* decsz */ |
| {0x0000, 0x0000}, |
| }; |
| |
| #define IS_SKIP_OPCODE(code) \ |
| ip2k_is_opcode (code, ip2k_skip_opcodes) |
| |
| /* 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, 0,0,0, false, 0, "R_IP2K_NONE", 0, 0), |
| /* A 16 bit absolute relocation. */ |
| IP2K_HOWTO (R_IP2K_16, 0,2,16, false, 0, "R_IP2K_16", 0, 0xffff), |
| /* A 32 bit absolute relocation. */ |
| IP2K_HOWTO (R_IP2K_32, 0,4,32, 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, 0,2,9, false, 0, "R_IP2K_FR9", 0, 0x00ff), |
| /* A 4-bit data relocation. */ |
| IP2K_HOWTO (R_IP2K_BANK, 8,2,4, false, 0, "R_IP2K_BANK", 0, 0x000f), |
| /* A 13-bit insn relocation - word address => right-shift 1 bit extra. */ |
| IP2K_HOWTO (R_IP2K_ADDR16CJP, 1,2,13, false, 0, "R_IP2K_ADDR16CJP", 0, 0x1fff), |
| /* A 3-bit insn relocation - word address => right-shift 1 bit extra. */ |
| IP2K_HOWTO (R_IP2K_PAGE3, 14,2,3, false, 0, "R_IP2K_PAGE3", 0, 0x0007), |
| /* Two 8-bit data relocations. */ |
| IP2K_HOWTO (R_IP2K_LO8DATA, 0,2,8, false, 0, "R_IP2K_LO8DATA", 0, 0x00ff), |
| IP2K_HOWTO (R_IP2K_HI8DATA, 8,2,8, false, 0, "R_IP2K_HI8DATA", 0, 0x00ff), |
| /* Two 8-bit insn relocations. word address => right-shift 1 bit extra. */ |
| IP2K_HOWTO (R_IP2K_LO8INSN, 1,2,8, false, 0, "R_IP2K_LO8INSN", 0, 0x00ff), |
| IP2K_HOWTO (R_IP2K_HI8INSN, 9,2,8, false, 0, "R_IP2K_HI8INSN", 0, 0x00ff), |
| |
| /* Special 1 bit relocation for SKIP instructions. */ |
| IP2K_HOWTO (R_IP2K_PC_SKIP, 1,2,1, false, 12, "R_IP2K_PC_SKIP", 0xfffe, 0x1000), |
| /* 16 bit word address. */ |
| IP2K_HOWTO (R_IP2K_TEXT, 1,2,16, 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, 0,2,9, false, 0, "R_IP2K_FR_OFFSET", 0x180, 0x007f), |
| /* Bits 23:16 of an address. */ |
| IP2K_HOWTO (R_IP2K_EX8DATA, 16,2,8, false, 0, "R_IP2K_EX8DATA", 0, 0x00ff), |
| }; |
| |
| |
| /* Map BFD reloc types to IP2K ELF reloc types. */ |
| |
| static reloc_howto_type * |
| ip2k_reloc_type_lookup (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; |
| } |
| |
| static reloc_howto_type * |
| ip2k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| { |
| unsigned int i; |
| |
| for (i = 0; |
| i < sizeof (ip2k_elf_howto_table) / sizeof (ip2k_elf_howto_table[0]); |
| i++) |
| if (ip2k_elf_howto_table[i].name != NULL |
| && strcasecmp (ip2k_elf_howto_table[i].name, r_name) == 0) |
| return &ip2k_elf_howto_table[i]; |
| |
| return NULL; |
| } |
| |
| static void |
| ip2k_get_mem (bfd *abfd ATTRIBUTE_UNUSED, |
| bfd_byte *addr, |
| int length, |
| bfd_byte *ptr) |
| { |
| while (length --) |
| * ptr ++ = bfd_get_8 (abfd, addr ++); |
| } |
| |
| static bool |
| ip2k_is_opcode (bfd_byte *code, const struct ip2k_opcode *opcodes) |
| { |
| unsigned short insn = (code[0] << 8) | code[1]; |
| |
| while (opcodes->mask != 0) |
| { |
| if ((insn & opcodes->mask) == opcodes->opcode) |
| return true; |
| |
| opcodes ++; |
| } |
| |
| return false; |
| } |
| |
| #define PAGENO(ABSADDR) ((ABSADDR) & 0xFFFFC000) |
| #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 (bfd *abfd, |
| Elf_Internal_Shdr *symtab_hdr, |
| Elf_Internal_Sym *isymbuf, |
| Elf_Internal_Rela *irel) |
| { |
| if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| { |
| Elf_Internal_Sym *isym; |
| asection *sym_sec; |
| |
| isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 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 int |
| ip2k_is_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| bfd_vma addr, |
| bfd_byte *contents) |
| { |
| bfd_byte code[4]; |
| int table_index = 0; |
| |
| /* Check current page-jmp. */ |
| if (addr + 4 > sec->size) |
| return -1; |
| |
| ip2k_get_mem (abfd, contents + addr, 4, code); |
| |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| return -1; |
| |
| /* Search back. */ |
| while (1) |
| { |
| if (addr < 4) |
| return -1; |
| |
| /* Check previous 2 instructions. */ |
| ip2k_get_mem (abfd, contents + addr - 4, 4, code); |
| if ((IS_ADD_W_WREG_OPCODE (code + 0)) |
| && (IS_ADD_PCL_W_OPCODE (code + 2))) |
| return table_index; |
| |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| return -1; |
| |
| table_index++; |
| addr -= 4; |
| } |
| } |
| |
| /* 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 int |
| ip2k_is_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| bfd_vma addr, |
| bfd_byte *contents) |
| { |
| bfd_byte code[16]; |
| int table_index = 0; |
| |
| /* Check current page-jmp. */ |
| if (addr + 4 > sec->size) |
| return -1; |
| |
| ip2k_get_mem (abfd, contents + addr, 4, code); |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| return -1; |
| |
| /* Search back. */ |
| while (1) |
| { |
| if (addr < 16) |
| return -1; |
| |
| /* Check previous 8 instructions. */ |
| ip2k_get_mem (abfd, contents + addr - 16, 16, code); |
| if ((IS_ADD_W_WREG_OPCODE (code + 0)) |
| && (IS_SNC_OPCODE (code + 2)) |
| && (IS_INC_1SP_OPCODE (code + 4)) |
| && (IS_ADD_2SP_W_OPCODE (code + 6)) |
| && (IS_SNC_OPCODE (code + 8)) |
| && (IS_INC_1SP_OPCODE (code + 10)) |
| && (IS_PAGE_OPCODE (code + 12)) |
| && (IS_JMP_OPCODE (code + 14))) |
| return table_index; |
| |
| if ((IS_ADD_W_WREG_OPCODE (code + 2)) |
| && (IS_SNC_OPCODE (code + 4)) |
| && (IS_INC_1SP_OPCODE (code + 6)) |
| && (IS_ADD_2SP_W_OPCODE (code + 8)) |
| && (IS_SNC_OPCODE (code + 10)) |
| && (IS_INC_1SP_OPCODE (code + 12)) |
| && (IS_JMP_OPCODE (code + 14))) |
| return table_index; |
| |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| return -1; |
| |
| table_index++; |
| addr -= 4; |
| } |
| } |
| |
| /* Returns the expected page state for the given instruction not including |
| the effect of page instructions. */ |
| |
| static bfd_vma |
| ip2k_nominal_page_bits (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| bfd_vma addr, |
| bfd_byte *contents) |
| { |
| bfd_vma page = PAGENO (BASEADDR (sec) + addr); |
| |
| /* Check if section flows into this page. If not then the page |
| bits are assumed to match the PC. This will be true unless |
| the user has a page instruction without a call/jump, in which |
| case they are on their own. */ |
| if (PAGENO (BASEADDR (sec)) == page) |
| return page; |
| |
| /* Section flows across page boundary. The page bits should match |
| the PC unless there is a possible flow from the previous page, |
| in which case it is not possible to determine the value of the |
| page bits. */ |
| while (PAGENO (BASEADDR (sec) + addr - 2) == page) |
| { |
| bfd_byte code[2]; |
| |
| addr -= 2; |
| ip2k_get_mem (abfd, contents + addr, 2, code); |
| if (!IS_PAGE_OPCODE (code)) |
| continue; |
| |
| /* Found a page instruction, check if jump table. */ |
| if (ip2k_is_switch_table_128 (abfd, sec, addr, contents) != -1) |
| /* Jump table => page is conditional. */ |
| continue; |
| |
| if (ip2k_is_switch_table_256 (abfd, sec, addr, contents) != -1) |
| /* Jump table => page is conditional. */ |
| continue; |
| |
| /* Found a page instruction, check if conditional. */ |
| if (addr >= 2) |
| { |
| ip2k_get_mem (abfd, contents + addr - 2, 2, code); |
| if (IS_SKIP_OPCODE (code)) |
| /* Page is conditional. */ |
| continue; |
| } |
| |
| /* Unconditional page instruction => page bits should be correct. */ |
| return page; |
| } |
| |
| /* Flow from previous page => page bits are impossible to determine. */ |
| return 0; |
| } |
| |
| static bool |
| ip2k_test_page_insn (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| Elf_Internal_Rela *irel, |
| struct misc *misc) |
| { |
| bfd_vma symval; |
| |
| /* Get the value of the symbol referred to by the reloc. */ |
| symval = symbol_value (abfd, misc->symtab_hdr, misc->isymbuf, irel); |
| 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. */ |
| return false; |
| |
| /* Test if we can delete this page instruction. */ |
| if (PAGENO (symval + irel->r_addend) != |
| ip2k_nominal_page_bits (abfd, sec, irel->r_offset, misc->contents)) |
| return 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 (bfd *abfd, |
| asection *sec, |
| bfd_vma addr, |
| bfd_vma endaddr, |
| int count, |
| int noadj) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| Elf_Internal_Sym *isymbuf, *isym, *isymend; |
| unsigned int shndx; |
| Elf_Internal_Rela *irel, *irelend, *irelbase; |
| struct elf_link_hash_entry **sym_hashes; |
| struct elf_link_hash_entry **end_hashes; |
| unsigned int symcount; |
| asection *stab; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| |
| shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| |
| 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) |
| { |
| asection *sym_sec; |
| |
| /* A local symbol. */ |
| isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| |
| if (isym->st_shndx == shndx) |
| { |
| 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 && stab->reloc_count != 0) |
| { |
| bfd_byte *stabcontents, *stabend, *stabp; |
| bfd_size_type stab_size = stab->rawsize ? stab->rawsize : stab->size; |
| |
| 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 |
| { |
| if (!bfd_malloc_and_get_section (abfd, stab, &stabcontents)) |
| { |
| free (stabcontents); |
| return; |
| } |
| |
| /* We need to remember this. */ |
| elf_section_data (stab)->this_hdr.contents = stabcontents; |
| } |
| |
| stabend = stabcontents + stab_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) |
| { |
| asection *sym_sec; |
| |
| /* A local symbol. */ |
| isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| |
| if (sym_sec == sec) |
| { |
| const char *name; |
| unsigned char type; |
| 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. */ |
| type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 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. */ |
| type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 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. */ |
| isymend = isymbuf + symtab_hdr->sh_info; |
| for (isym = isymbuf; isym < isymend; isym++) |
| { |
| if (isym->st_shndx == shndx |
| && addr <= isym->st_value |
| && isym->st_value < endaddr) |
| isym->st_value += count; |
| } |
| |
| /* Now adjust the global symbols defined in this section. */ |
| symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| - symtab_hdr->sh_info); |
| sym_hashes = elf_sym_hashes (abfd); |
| end_hashes = sym_hashes + symcount; |
| for (; sym_hashes < end_hashes; sym_hashes++) |
| { |
| struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| |
| if ((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) |
| sym_hash->root.u.def.value += count; |
| } |
| } |
| |
| return; |
| } |
| |
| /* Delete some bytes from a section while relaxing. */ |
| |
| static bool |
| ip2k_elf_relax_delete_bytes (bfd *abfd, |
| asection *sec, |
| bfd_vma addr, |
| int count) |
| { |
| bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| bfd_vma endaddr = sec->size; |
| |
| /* Actually delete the bytes. */ |
| memmove (contents + addr, contents + addr + count, |
| endaddr - addr - count); |
| |
| sec->size -= count; |
| |
| adjust_all_relocations (abfd, sec, addr + count, endaddr, -count, 0); |
| return true; |
| } |
| |
| static bool |
| ip2k_delete_page_insn (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| Elf_Internal_Rela *irel, |
| bool *again, |
| struct misc *misc) |
| { |
| /* Note that we've changed the relocs, section contents, etc. */ |
| elf_section_data (sec)->relocs = misc->irelbase; |
| elf_section_data (sec)->this_hdr.contents = misc->contents; |
| misc->symtab_hdr->contents = (bfd_byte *) misc->isymbuf; |
| |
| /* 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, 2)) |
| return false; |
| |
| /* Modified => will need to iterate relaxation again. */ |
| *again = true; |
| |
| return true; |
| } |
| |
| static bool |
| ip2k_relax_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| Elf_Internal_Rela *irel, |
| bool *again, |
| struct misc *misc) |
| { |
| Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| Elf_Internal_Rela *ireltest = irel; |
| bfd_byte code[4]; |
| bfd_vma addr; |
| |
| /* Test all page instructions. */ |
| addr = irel->r_offset; |
| while (1) |
| { |
| if (addr + 4 > sec->size) |
| break; |
| |
| ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| break; |
| |
| /* Validate relocation entry (every entry should have a matching |
| relocation entry). */ |
| if (ireltest >= irelend) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| return false; |
| } |
| |
| if (ireltest->r_offset != addr) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| return false; |
| } |
| |
| if (! ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| /* Un-removable page insn => nothing can be done. */ |
| return true; |
| |
| addr += 4; |
| ireltest += 2; |
| } |
| |
| /* Relaxable. Adjust table header. */ |
| ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 4, code); |
| if ((! IS_ADD_W_WREG_OPCODE (code + 0)) |
| || (! IS_ADD_PCL_W_OPCODE (code + 2))) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| return false; |
| } |
| |
| if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset - 4, 2)) |
| return false; |
| |
| *again = true; |
| |
| /* Delete all page instructions in table. */ |
| while (irel < ireltest) |
| { |
| if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| return false; |
| irel += 2; |
| } |
| |
| return true; |
| } |
| |
| static bool |
| ip2k_relax_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, |
| Elf_Internal_Rela *irel, |
| bool *again, |
| struct misc *misc) |
| { |
| Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| Elf_Internal_Rela *ireltest = irel; |
| bfd_byte code[12]; |
| bfd_vma addr; |
| |
| /* Test all page instructions. */ |
| addr = irel->r_offset; |
| |
| while (1) |
| { |
| if (addr + 4 > sec->size) |
| break; |
| |
| ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| |
| if ((! IS_PAGE_OPCODE (code + 0)) |
| || (! IS_JMP_OPCODE (code + 2))) |
| break; |
| |
| /* Validate relocation entry (every entry should have a matching |
| relocation entry). */ |
| if (ireltest >= irelend) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| return false; |
| } |
| |
| if (ireltest->r_offset != addr) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| return false; |
| } |
| |
| if (!ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| /* Un-removable page insn => nothing can be done. */ |
| return true; |
| |
| addr += 4; |
| ireltest += 2; |
| } |
| |
| /* Relaxable. Adjust table header. */ |
| ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 2, code); |
| if (IS_PAGE_OPCODE (code)) |
| addr = irel->r_offset - 16; |
| else |
| addr = irel->r_offset - 14; |
| |
| ip2k_get_mem (abfd, misc->contents + addr, 12, code); |
| if ((!IS_ADD_W_WREG_OPCODE (code + 0)) |
| || (!IS_SNC_OPCODE (code + 2)) |
| || (!IS_INC_1SP_OPCODE (code + 4)) |
| || (!IS_ADD_2SP_W_OPCODE (code + 6)) |
| || (!IS_SNC_OPCODE (code + 8)) |
| || (!IS_INC_1SP_OPCODE (code + 10))) |
| { |
| _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| return false; |
| } |
| |
| /* Delete first 3 opcodes. */ |
| if (!ip2k_elf_relax_delete_bytes (abfd, sec, addr + 0, 6)) |
| return false; |
| |
| *again = true; |
| |
| /* Delete all page instructions in table. */ |
| while (irel < ireltest) |
| { |
| if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| return false; |
| irel += 2; |
| } |
| |
| return true; |
| } |
| |
| /* This function handles relaxation of a section in a specific page. */ |
| |
| static bool |
| ip2k_elf_relax_section_page (bfd *abfd, |
| asection *sec, |
| bool *again, |
| struct misc *misc, |
| unsigned long page_start, |
| unsigned long page_end) |
| { |
| Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| Elf_Internal_Rela *irel; |
| int switch_table_128; |
| int switch_table_256; |
| |
| /* Walk thru the section looking for relaxation opportunities. */ |
| for (irel = misc->irelbase; irel < irelend; irel++) |
| { |
| if (ELF32_R_TYPE (irel->r_info) != (int) R_IP2K_PAGE3) |
| /* Ignore non page instructions. */ |
| continue; |
| |
| if (BASEADDR (sec) + irel->r_offset < page_start) |
| /* Ignore page instructions on earlier page - they have |
| already been processed. Remember that there is code flow |
| that crosses a page boundary. */ |
| continue; |
| |
| if (BASEADDR (sec) + irel->r_offset > page_end) |
| /* Flow beyond end of page => nothing more to do for this page. */ |
| return true; |
| |
| /* Detect switch tables. */ |
| switch_table_128 = ip2k_is_switch_table_128 (abfd, sec, irel->r_offset, misc->contents); |
| switch_table_256 = ip2k_is_switch_table_256 (abfd, sec, irel->r_offset, misc->contents); |
| |
| if ((switch_table_128 > 0) || (switch_table_256 > 0)) |
| /* If the index is greater than 0 then it has already been processed. */ |
| continue; |
| |
| if (switch_table_128 == 0) |
| { |
| if (!ip2k_relax_switch_table_128 (abfd, sec, irel, again, misc)) |
| return false; |
| |
| continue; |
| } |
| |
| if (switch_table_256 == 0) |
| { |
| if (!ip2k_relax_switch_table_256 (abfd, sec, irel, again, misc)) |
| return false; |
| |
| continue; |
| } |
| |
| /* Simple relax. */ |
| if (ip2k_test_page_insn (abfd, sec, irel, misc)) |
| { |
| if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| return false; |
| |
| continue; |
| } |
| } |
| |
| return true; |
| } |
| |
| /* This function handles relaxing for the ip2k. |
| |
| Principle: Start with the first page and remove page instructions that |
| are not require on this first page. By removing page instructions more |
| code will fit into this page - repeat until nothing more can be achieved |
| for this page. Move on to the next page. |
| |
| Processing the pages one at a time from the lowest page allows a removal |
| only policy to be used - pages can be removed but are never reinserted. */ |
| |
| static bool |
| ip2k_elf_relax_section (bfd *abfd, |
| asection *sec, |
| struct bfd_link_info *link_info, |
| bool *again) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| Elf_Internal_Rela *internal_relocs; |
| bfd_byte *contents = NULL; |
| Elf_Internal_Sym *isymbuf = NULL; |
| static asection * first_section = NULL; |
| static unsigned long search_addr; |
| static unsigned long page_start = 0; |
| static unsigned long page_end = 0; |
| static unsigned int pass = 0; |
| static bool new_pass = false; |
| static bool changed = false; |
| struct misc misc; |
| |
| /* Assume nothing changes. */ |
| *again = false; |
| |
| if (first_section == NULL) |
| { |
| ip2k_relaxed = true; |
| first_section = sec; |
| } |
| |
| if (first_section == sec) |
| { |
| pass++; |
| new_pass = true; |
| } |
| |
| /* 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 (bfd_link_relocatable (link_info) |
| || sec->reloc_count == 0 |
| || (sec->flags & SEC_RELOC) == 0 |
| || (sec->flags & SEC_HAS_CONTENTS) == 0 |
| || (sec->flags & SEC_CODE) == 0) |
| return true; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| |
| internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| link_info->keep_memory); |
| if (internal_relocs == NULL) |
| goto error_return; |
| |
| /* Get section contents cached copy if it exists. */ |
| if (contents == NULL) |
| { |
| /* Get cached copy if it exists. */ |
| if (elf_section_data (sec)->this_hdr.contents != NULL) |
| contents = elf_section_data (sec)->this_hdr.contents; |
| else |
| { |
| /* Go get them off disk. */ |
| if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| goto error_return; |
| } |
| } |
| |
| /* Read this BFD's symbols cached copy if it exists. */ |
| if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| { |
| isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| if (isymbuf == NULL) |
| isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| symtab_hdr->sh_info, 0, |
| NULL, NULL, NULL); |
| if (isymbuf == NULL) |
| goto error_return; |
| } |
| |
| misc.symtab_hdr = symtab_hdr; |
| misc.isymbuf = isymbuf; |
| misc.irelbase = internal_relocs; |
| misc.contents = contents; |
| |
| /* This is where all the relaxation actually get done. */ |
| if ((pass == 1) || (new_pass && !changed)) |
| { |
| /* On the first pass we simply search for the lowest page that |
| we havn't relaxed yet. Note that the pass count is reset |
| each time a page is complete in order to move on to the next page. |
| If we can't find any more pages then we are finished. */ |
| if (new_pass) |
| { |
| pass = 1; |
| new_pass = false; |
| changed = true; /* Pre-initialize to break out of pass 1. */ |
| search_addr = 0xFFFFFFFF; |
| } |
| |
| if ((BASEADDR (sec) + sec->size < search_addr) |
| && (BASEADDR (sec) + sec->size > page_end)) |
| { |
| if (BASEADDR (sec) <= page_end) |
| search_addr = page_end + 1; |
| else |
| search_addr = BASEADDR (sec); |
| |
| /* Found a page => more work to do. */ |
| *again = true; |
| } |
| } |
| else |
| { |
| if (new_pass) |
| { |
| new_pass = false; |
| changed = false; |
| page_start = PAGENO (search_addr); |
| page_end = page_start | 0x00003FFF; |
| } |
| |
| /* Only process sections in range. */ |
| if ((BASEADDR (sec) + sec->size >= page_start) |
| && (BASEADDR (sec) <= page_end)) |
| { |
| if (!ip2k_elf_relax_section_page (abfd, sec, &changed, &misc, page_start, page_end)) |
| return false; |
| } |
| *again = true; |
| } |
| |
| /* Perform some house keeping after relaxing the section. */ |
| |
| if (isymbuf != NULL |
| && symtab_hdr->contents != (unsigned char *) isymbuf) |
| { |
| if (! link_info->keep_memory) |
| free (isymbuf); |
| else |
| symtab_hdr->contents = (unsigned char *) isymbuf; |
| } |
| |
| if (contents != NULL |
| && elf_section_data (sec)->this_hdr.contents != contents) |
| { |
| if (! link_info->keep_memory) |
| free (contents); |
| else |
| { |
| /* Cache the section contents for elf_link_input_bfd. */ |
| elf_section_data (sec)->this_hdr.contents = contents; |
| } |
| } |
| |
| if (elf_section_data (sec)->relocs != internal_relocs) |
| free (internal_relocs); |
| |
| return true; |
| |
| error_return: |
| if (symtab_hdr->contents != (unsigned char *) isymbuf) |
| free (isymbuf); |
| if (elf_section_data (sec)->this_hdr.contents != contents) |
| free (contents); |
| if (elf_section_data (sec)->relocs != internal_relocs) |
| free (internal_relocs); |
| return false; |
| } |
| |
| /* Set the howto pointer for a IP2K ELF reloc. */ |
| |
| static bool |
| ip2k_info_to_howto_rela (bfd * abfd, |
| arelent * cache_ptr, |
| Elf_Internal_Rela * dst) |
| { |
| unsigned int r_type; |
| |
| r_type = ELF32_R_TYPE (dst->r_info); |
| if (r_type >= (unsigned int) R_IP2K_max) |
| { |
| /* xgettext:c-format */ |
| _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| abfd, r_type); |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| cache_ptr->howto = & ip2k_elf_howto_table [r_type]; |
| return true; |
| } |
| |
| /* Perform a single relocation. |
| By default we use the standard BFD routines. */ |
| |
| static bfd_reloc_status_type |
| ip2k_final_link_relocate (reloc_howto_type * howto, |
| bfd * input_bfd, |
| asection * input_section, |
| bfd_byte * contents, |
| Elf_Internal_Rela * rel, |
| bfd_vma relocation) |
| { |
| static bfd_vma page_addr = 0; |
| |
| 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_PAGE3: |
| page_addr = BASEADDR (input_section) + rel->r_offset; |
| if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| relocation &= ~IP2K_INSN_MASK; |
| else |
| r = bfd_reloc_notsupported; |
| break; |
| |
| case R_IP2K_ADDR16CJP: |
| if (BASEADDR (input_section) + rel->r_offset != page_addr + 2) |
| { |
| /* No preceding page instruction, verify that it isn't needed. */ |
| if (PAGENO (relocation + rel->r_addend) != |
| ip2k_nominal_page_bits (input_bfd, input_section, |
| rel->r_offset, contents)) |
| /* xgettext:c-format */ |
| _bfd_error_handler |
| (_("ip2k linker: missing page instruction " |
| "at %#" PRIx64 " (dest = %#" PRIx64 ")"), |
| (uint64_t) (BASEADDR (input_section) + rel->r_offset), |
| (uint64_t) (relocation + rel->r_addend)); |
| } |
| else if (ip2k_relaxed) |
| { |
| /* Preceding page instruction. Verify that the page instruction is |
| really needed. One reason for the relaxation to miss a page is if |
| the section is not marked as executable. */ |
| if (!ip2k_is_switch_table_128 (input_bfd, input_section, |
| rel->r_offset - 2, contents) |
| && !ip2k_is_switch_table_256 (input_bfd, input_section, |
| rel->r_offset - 2, contents) |
| && (PAGENO (relocation + rel->r_addend) == |
| ip2k_nominal_page_bits (input_bfd, input_section, |
| rel->r_offset - 2, contents))) |
| /* xgettext:c-format */ |
| _bfd_error_handler |
| (_("ip2k linker: redundant page instruction " |
| "at %#" PRIx64 " (dest = %#" PRIx64 ")"), |
| (uint64_t) page_addr, |
| (uint64_t) (relocation + rel->r_addend)); |
| } |
| if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| relocation &= ~IP2K_INSN_MASK; |
| else |
| r = bfd_reloc_notsupported; |
| break; |
| |
| 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. |
| |
| 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 relocatable |
| 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 relocatable 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 int |
| ip2k_elf_relocate_section (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); |
| howto = ip2k_elf_howto_table + r_type; |
| 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 (sec) : name; |
| } |
| else |
| { |
| bool warned, ignored; |
| bool unresolved_reloc; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| r_symndx, symtab_hdr, sym_hashes, |
| h, sec, relocation, |
| unresolved_reloc, warned, ignored); |
| |
| name = h->root.root.string; |
| } |
| |
| if (sec != NULL && discarded_section (sec)) |
| RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| rel, 1, relend, howto, 0, contents); |
| |
| if (bfd_link_relocatable (info)) |
| continue; |
| |
| /* 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 = NULL; |
| |
| switch (r) |
| { |
| case bfd_reloc_overflow: |
| (*info->callbacks->reloc_overflow) |
| (info, (h ? &h->root : NULL), name, howto->name, |
| (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| break; |
| |
| case bfd_reloc_undefined: |
| (*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) |
| (*info->callbacks->warning) (info, msg, name, input_bfd, |
| input_section, rel->r_offset); |
| } |
| } |
| |
| return true; |
| } |
| |
| #define TARGET_BIG_SYM ip2k_elf32_vec |
| #define TARGET_BIG_NAME "elf32-ip2k" |
| |
| #define ELF_ARCH bfd_arch_ip2k |
| #define ELF_MACHINE_CODE EM_IP2K |
| #define ELF_MACHINE_ALT1 EM_IP2K_OLD |
| #define ELF_MAXPAGESIZE 1 /* No pages on the IP2K. */ |
| |
| #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_rela_normal 1 |
| #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_reloc_name_lookup ip2k_reloc_name_lookup |
| #define bfd_elf32_bfd_relax_section ip2k_elf_relax_section |
| |
| #include "elf32-target.h" |