X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=bfd%2Felf64-ppc.c;h=8e1935dfb9d1a941dcd3d97c18bfd54e9c66b7d1;hb=86fb1dece37497b267579ed4f062d280cd5760cd;hp=97aa485c9d9a83f2b497179c8ce976b777adac94;hpb=ec33885937c311707a20bac4207422abde93511e;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c index 97aa485c9d..8e1935dfb9 100644 --- a/bfd/elf64-ppc.c +++ b/bfd/elf64-ppc.c @@ -1,5 +1,5 @@ /* PowerPC64-specific support for 64-bit ELF. - Copyright 1999, 2000, 2001 Free Software Foundation, Inc. + Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc. Written by Linus Nordberg, Swox AB , based on elf32-ppc.c by Ian Lance Taylor. @@ -28,6 +28,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "libbfd.h" #include "elf-bfd.h" #include "elf/ppc.h" +#include "elf64-ppc.h" #define USE_RELA /* we want RELA relocations, not REL. */ @@ -38,65 +39,31 @@ static reloc_howto_type *ppc64_elf_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void ppc64_elf_info_to_howto PARAMS ((bfd *abfd, arelent *cache_ptr, Elf64_Internal_Rela *dst)); -static bfd_reloc_status_type ppc64_elf_addr16_ha_reloc +static bfd_reloc_status_type ppc64_elf_ha_reloc PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_brtaken_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_sectoff_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_toc_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_toc_ha_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_toc64_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type ppc64_elf_unhandled_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static void ppc64_elf_get_symbol_info + PARAMS ((bfd *, asymbol *, symbol_info *)); static boolean ppc64_elf_set_private_flags PARAMS ((bfd *, flagword)); -static boolean ppc64_elf_copy_private_bfd_data - PARAMS ((bfd *, bfd *)); static boolean ppc64_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); static boolean ppc64_elf_section_from_shdr - PARAMS ((bfd *, Elf64_Internal_Shdr *, char *)); -static struct bfd_hash_entry *link_hash_newfunc - PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); -static struct bfd_link_hash_table *ppc64_elf_link_hash_table_create - PARAMS ((bfd *)); -static boolean create_got_section - PARAMS ((bfd *, struct bfd_link_info *)); -static boolean ppc64_elf_create_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); -static void ppc64_elf_copy_indirect_symbol - PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); -static boolean ppc64_elf_check_relocs - PARAMS ((bfd *, struct bfd_link_info *, asection *, - const Elf_Internal_Rela *)); -static asection * ppc64_elf_gc_mark_hook - PARAMS ((bfd *abfd, struct bfd_link_info *info, Elf_Internal_Rela *rel, - struct elf_link_hash_entry *h, Elf_Internal_Sym *sym)); -static boolean ppc64_elf_gc_sweep_hook - PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *sec, - const Elf_Internal_Rela *relocs)); -static boolean ppc64_elf_adjust_dynamic_symbol - PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); -static boolean allocate_dynrelocs - PARAMS ((struct elf_link_hash_entry *, PTR)); -static boolean readonly_dynrelocs - PARAMS ((struct elf_link_hash_entry *, PTR)); -static enum elf_reloc_type_class ppc64_elf_reloc_type_class - PARAMS ((const Elf_Internal_Rela *)); -static boolean ppc64_elf_size_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); -static boolean ppc64_elf_final_link - PARAMS ((bfd *, struct bfd_link_info *)); -static boolean ppc64_elf_fake_sections - PARAMS ((bfd *, Elf64_Internal_Shdr *, asection *)); -static boolean ppc64_elf_relocate_section - PARAMS ((bfd *, struct bfd_link_info *info, bfd *, asection *, bfd_byte *, - Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms, - asection **)); -static boolean ppc64_elf_finish_dynamic_symbol - PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, - Elf_Internal_Sym *)); -static boolean ppc64_elf_finish_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); - + PARAMS ((bfd *, Elf64_Internal_Shdr *, const char *)); -/* Mask to set RA in memory instructions. */ -#define RA_REGISTER_MASK 0x001f0000 - -/* Value to shift register by to insert RA. */ -#define RA_REGISTER_SHIFT 16 /* The name of the dynamic interpreter. This is put in the .interp section. */ @@ -106,24 +73,63 @@ static boolean ppc64_elf_finish_dynamic_sections #define PLT_ENTRY_SIZE 24 /* The initial size of the plt reserved for the dynamic linker. */ -#define PLT_INITIAL_ENTRY_SIZE 96 +#define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE /* TOC base pointers offset from start of TOC. */ #define TOC_BASE_OFF (0x8000) -/* Global linkage stub. The first instruction has its offset patched. */ -/* FIXME: Need traceback table? */ -static const unsigned int ppc64_elf_glink_code[] = { - 0xe9820000, /* ld %r12,0(%r2) */ - 0xf8410028, /* std %r2,40(%r1) */ - 0xe80c0000, /* ld %r0,0(%r12) */ - 0xe84c0008, /* ld %r2,8(%r12) */ - 0x7c0903a6, /* mtctr %r0 */ - 0x4e800420 /* bctr */ -}; - -#define PPC64_ELF_GLINK_SIZE \ - ((sizeof ppc64_elf_glink_code / sizeof ppc64_elf_glink_code[0]) * 4) +/* .plt call stub instructions. */ +#define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ +#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */ +#define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */ +#define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */ +#define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */ + /* ld %r11,xxx+16@l(%r12) */ +#define BCTR 0x4e800420 /* bctr */ + +/* The normal stub is this size. */ +#define PLT_CALL_STUB_SIZE (7*4) + +/* But sometimes the .plt entry crosses a 64k boundary, and we need + to adjust the high word with this insn. */ +#define ADDIS_R12_R12_1 0x3d8c0001 /* addis %r12,%r12,1 */ + +/* The .glink fixup call stub is the same as the .plt call stub, but + the first instruction restores r2, and the std is omitted. */ +#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */ + +/* Always allow this much space. */ +#define GLINK_CALL_STUB_SIZE (8*4) + +/* Pad with this. */ +#define NOP 0x60000000 + +/* Some other nops. */ +#define CROR_151515 0x4def7b82 +#define CROR_313131 0x4ffffb82 + +/* .glink entries for the first 32k functions are two instructions. */ +#define LI_R0_0 0x38000000 /* li %r0,0 */ +#define B_DOT 0x48000000 /* b . */ + +/* After that, we need two instructions to load the index, followed by + a branch. */ +#define LIS_R0_0 0x3c000000 /* lis %r0,0 */ +#define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */ + +/* Instructions to save and restore floating point regs. */ +#define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */ +#define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */ +#define BLR 0x4e800020 /* blr */ + +/* Since .opd is an array of descriptors and each entry will end up + with identical R_PPC64_RELATIVE relocs, there is really no need to + propagate .opd relocs; The dynamic linker should be taught to + relocate .opd without reloc entries. FIXME: .opd should be trimmed + of unused values. */ +#ifndef NO_OPD_RELOCS +#define NO_OPD_RELOCS 0 +#endif /* Relocation HOWTO's. */ static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC_max]; @@ -229,7 +235,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_ha_reloc, /* special_function */ "R_PPC64_ADDR16_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -262,7 +268,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_brtaken_reloc, /* special_function */ "R_PPC64_ADDR14_BRTAKEN",/* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -279,7 +285,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_brtaken_reloc, /* special_function */ "R_PPC64_ADDR14_BRNTAKEN",/* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -326,7 +332,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { true, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_brtaken_reloc, /* special_function */ "R_PPC64_REL14_BRTAKEN", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -343,7 +349,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { true, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_brtaken_reloc, /* special_function */ "R_PPC64_REL14_BRNTAKEN",/* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -359,7 +365,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -375,7 +381,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16_LO", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -391,7 +397,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16_HI", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -407,7 +413,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -426,7 +432,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_COPY", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -442,7 +448,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GLOB_DAT", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -458,7 +464,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_JMP_SLOT", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -519,7 +525,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { 32, /* bitsize */ true, /* pc_relative */ 0, /* bitpos */ - /* FIXME: Verify. Was complain_overflow_bitfield. */ + /* FIXME: Verify. Was complain_overflow_bitfield. */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_PPC64_REL32", /* name */ @@ -528,8 +534,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { 0xffffffff, /* dst_mask */ true), /* pcrel_offset */ - /* 32-bit relocation to the symbol's procedure linkage table. - FIXME: R_PPC64_PLT32 not supported. */ + /* 32-bit relocation to the symbol's procedure linkage table. */ HOWTO (R_PPC64_PLT32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ @@ -537,7 +542,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT32", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -569,7 +574,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT16_LO", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -585,7 +590,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT16_HI", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -601,31 +606,29 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT16_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ - /* 32-bit section relative relocation. */ - /* FIXME: Verify R_PPC64_SECTOFF. Seems strange with size=2 and - dst_mask=0. */ + /* 16-bit section relative relocation. */ HOWTO (R_PPC64_SECTOFF, /* type */ 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ - true, /* pc_relative */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_sectoff_reloc, /* special_function */ "R_PPC64_SECTOFF", /* name */ false, /* partial_inplace */ 0, /* src_mask */ - 0, /* dst_mask */ - true), /* pcrel_offset */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ - /* 16-bit lower half section relative relocation. */ + /* Like R_PPC64_SECTOFF, but no overflow warning. */ HOWTO (R_PPC64_SECTOFF_LO, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ @@ -633,7 +636,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_sectoff_reloc, /* special_function */ "R_PPC64_SECTOFF_LO", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -648,7 +651,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_sectoff_reloc, /* special_function */ "R_PPC64_SECTOFF_HI", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -663,7 +666,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_sectoff_ha_reloc, /* special_function */ "R_PPC64_SECTOFF_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -671,8 +674,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false), /* pcrel_offset */ /* Like R_PPC64_REL24 without touching the two least significant - bits. */ - /* FIXME: Verify R_PPC64_ADDR30. */ + bits. Should have been named R_PPC64_REL30! */ HOWTO (R_PPC64_ADDR30, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ @@ -728,7 +730,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_ha_reloc, /* special_function */ "R_PPC64_ADDR16_HIGHERA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -759,7 +761,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_ha_reloc, /* special_function */ "R_PPC64_ADDR16_HIGHESTA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -796,8 +798,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { 0xffffffffffffffff, /* dst_mask */ true), /* pcrel_offset */ - /* 64-bit relocation to the symbol's procedure linkage table. */ - /* FIXME: R_PPC64_PLT64 not supported. */ + /* 64-bit relocation to the symbol's procedure linkage table. */ HOWTO (R_PPC64_PLT64, /* type */ 0, /* rightshift */ 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ @@ -805,7 +806,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT64", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -822,7 +823,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { true, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTREL64", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -839,7 +840,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc_reloc, /* special_function */ "R_PPC64_TOC16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -856,7 +857,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc_reloc, /* special_function */ "R_PPC64_TOC16_LO", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -873,7 +874,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc_reloc, /* special_function */ "R_PPC64_TOC16_HI", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -892,7 +893,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_toc_ha_reloc, /* special_function */ "R_PPC64_TOC16_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -909,7 +910,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc64_reloc, /* special_function */ "R_PPC64_TOC", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -932,7 +933,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -948,7 +949,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16_LO", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -964,7 +965,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16_HI", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -982,7 +983,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ - ppc64_elf_addr16_ha_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16_HA", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1027,7 +1028,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1042,7 +1043,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_GOT16_LO_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1057,7 +1058,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLT16_LO_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1065,21 +1066,19 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false), /* pcrel_offset */ /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */ - /* FIXME: Verify R_PPC64_SECTOFF. Seems strange with size=2 and - dst_mask=0. */ HOWTO (R_PPC64_SECTOFF_DS, /* type */ 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ - true, /* pc_relative */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_sectoff_reloc, /* special_function */ "R_PPC64_SECTOFF_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ - 0, /* dst_mask */ - true), /* pcrel_offset */ + 0xfffc, /* dst_mask */ + false), /* pcrel_offset */ /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */ HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */ @@ -1089,7 +1088,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_sectoff_reloc, /* special_function */ "R_PPC64_SECTOFF_LO_DS",/* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1104,7 +1103,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc_reloc, /* special_function */ "R_PPC64_TOC16_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1119,7 +1118,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_toc_reloc, /* special_function */ "R_PPC64_TOC16_LO_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1135,7 +1134,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16_DS", /* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1151,7 +1150,7 @@ static reloc_howto_type ppc64_elf_howto_raw[] = { false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ + ppc64_elf_unhandled_reloc, /* special_function */ "R_PPC64_PLTGOT16_LO_DS",/* name */ false, /* partial_inplace */ 0, /* src_mask */ @@ -1277,7 +1276,7 @@ ppc64_elf_reloc_type_lookup (abfd, code) break; case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC64_PLT16_HA; break; - case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC64_SECTOFF; + case BFD_RELOC_16_BASEREL: ppc_reloc = R_PPC64_SECTOFF; break; case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC64_SECTOFF_LO; break; @@ -1285,9 +1284,7 @@ ppc64_elf_reloc_type_lookup (abfd, code) break; case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC64_SECTOFF_HA; break; - /* FIXME: Is CTOR 32 or 64 bits? Fix md_apply_fix3 in - gas/config/tc-ppc.c too. */ - case BFD_RELOC_CTOR: ppc_reloc = R_PPC64_ADDR32; + case BFD_RELOC_CTOR: ppc_reloc = R_PPC64_ADDR64; break; case BFD_RELOC_64: ppc_reloc = R_PPC64_ADDR64; break; @@ -1364,8 +1361,8 @@ ppc64_elf_info_to_howto (abfd, cache_ptr, dst) { unsigned int type; + /* Initialize howto table if needed. */ if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) - /* Initialize howto table if needed. */ ppc_howto_init (); type = ELF64_R_TYPE (dst->r_info); @@ -1377,41 +1374,281 @@ ppc64_elf_info_to_howto (abfd, cache_ptr, dst) /* Handle the R_PPC_ADDR16_HA and similar relocs. */ static bfd_reloc_status_type -ppc64_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section, - output_bfd, error_message) - bfd *abfd ATTRIBUTE_UNUSED; +ppc64_elf_ha_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + /* Adjust the addend for sign extension of the low 16 bits. + We won't actually be using the low 16 bits, so trashing them + doesn't matter. */ + reloc_entry->addend += 0x8000; + return bfd_reloc_continue; +} + +static bfd_reloc_status_type +ppc64_elf_brtaken_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; arelent *reloc_entry; asymbol *symbol; - PTR data ATTRIBUTE_UNUSED; + PTR data; asection *input_section; bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; + char **error_message; { - bfd_vma relocation; + long insn; + enum elf_ppc_reloc_type r_type; + bfd_size_type octets; + /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ + boolean is_power4 = false; + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + octets = reloc_entry->address * bfd_octets_per_byte (abfd); + insn = bfd_get_32 (abfd, (bfd_byte *) data + octets); + insn &= ~(0x01 << 21); + r_type = (enum elf_ppc_reloc_type) reloc_entry->howto->type; + if (r_type == R_PPC64_ADDR14_BRTAKEN + || r_type == R_PPC64_REL14_BRTAKEN) + insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ + + if (is_power4) + { + /* Set 'a' bit. This is 0b00010 in BO field for branch + on CR(BI) insns (BO == 001at or 011at), and 0b01000 + for branch on CTR insns (BO == 1a00t or 1a01t). */ + if ((insn & (0x14 << 21)) == (0x04 << 21)) + insn |= 0x02 << 21; + else if ((insn & (0x14 << 21)) == (0x10 << 21)) + insn |= 0x08 << 21; + else + return bfd_reloc_continue; + } + else { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; + bfd_vma target = 0; + bfd_vma from; + + if (!bfd_is_com_section (symbol->section)) + target = symbol->value; + target += symbol->section->output_section->vma; + target += symbol->section->output_offset; + target += reloc_entry->addend; + + from = (reloc_entry->address + + input_section->output_offset + + input_section->output_section->vma); + + /* Invert 'y' bit if not the default. */ + if ((bfd_signed_vma) (target - from) < 0) + insn ^= 0x01 << 21; } + bfd_put_32 (abfd, (bfd_vma) insn, (bfd_byte *) data + octets); + return bfd_reloc_continue; +} + +static bfd_reloc_status_type +ppc64_elf_sectoff_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); - if (reloc_entry->address > input_section->_cooked_size) - return bfd_reloc_outofrange; + /* Subtract the symbol section base address. */ + reloc_entry->addend -= symbol->section->output_section->vma; + return bfd_reloc_continue; +} - if (bfd_is_com_section (symbol->section)) - relocation = 0; - else - relocation = symbol->value; +static bfd_reloc_status_type +ppc64_elf_sectoff_ha_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + /* Subtract the symbol section base address. */ + reloc_entry->addend -= symbol->section->output_section->vma; + + /* Adjust the addend for sign extension of the low 16 bits. */ + reloc_entry->addend += 0x8000; + return bfd_reloc_continue; +} + +static bfd_reloc_status_type +ppc64_elf_toc_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + bfd_vma TOCstart; + + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + TOCstart = _bfd_get_gp_value (input_section->output_section->owner); + if (TOCstart == 0) + TOCstart = ppc64_elf_toc (input_section->output_section->owner); + + /* Subtract the TOC base address. */ + reloc_entry->addend -= TOCstart + TOC_BASE_OFF; + return bfd_reloc_continue; +} + +static bfd_reloc_status_type +ppc64_elf_toc_ha_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + bfd_vma TOCstart; + + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); - relocation += symbol->section->output_section->vma; - relocation += symbol->section->output_offset; - relocation += reloc_entry->addend; + TOCstart = _bfd_get_gp_value (input_section->output_section->owner); + if (TOCstart == 0) + TOCstart = ppc64_elf_toc (input_section->output_section->owner); - reloc_entry->addend += (relocation & 0x8000) << 1; + /* Subtract the TOC base address. */ + reloc_entry->addend -= TOCstart + TOC_BASE_OFF; + /* Adjust the addend for sign extension of the low 16 bits. */ + reloc_entry->addend += 0x8000; return bfd_reloc_continue; } +static bfd_reloc_status_type +ppc64_elf_toc64_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + bfd_vma TOCstart; + bfd_size_type octets; + + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + TOCstart = _bfd_get_gp_value (input_section->output_section->owner); + if (TOCstart == 0) + TOCstart = ppc64_elf_toc (input_section->output_section->owner); + + octets = reloc_entry->address * bfd_octets_per_byte (abfd); + bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets); + return bfd_reloc_ok; +} + +static bfd_reloc_status_type +ppc64_elf_unhandled_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + /* If this is a relocatable link (output_bfd test tells us), just + call the generic function. Any adjustment will be done at final + link time. */ + if (output_bfd != NULL) + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); + + if (error_message != NULL) + { + static char buf[60]; + sprintf (buf, "generic linker can't handle %s", + reloc_entry->howto->name); + *error_message = buf; + } + return bfd_reloc_dangerous; +} + +/* Return symbol info as per usual for ELF targets, except that + symbols in .opd are given 'd' or 'D' for type. */ + +static void +ppc64_elf_get_symbol_info (abfd, symbol, ret) + bfd *abfd; + asymbol *symbol; + symbol_info *ret; +{ + _bfd_elf_get_symbol_info (abfd, symbol, ret); + if (ret->type == '?' + && (symbol->flags & (BSF_GLOBAL | BSF_LOCAL)) != 0 + && strcmp (symbol->section->name, ".opd") == 0) + ret->type = (symbol->flags & BSF_GLOBAL) != 0 ? 'D' : 'd'; +} + /* Function to set whether a module needs the -mrelocatable bit set. */ static boolean @@ -1427,24 +1664,6 @@ ppc64_elf_set_private_flags (abfd, flags) return true; } -/* Copy backend specific data from one object module to another. */ -static boolean -ppc64_elf_copy_private_bfd_data (ibfd, obfd) - bfd *ibfd; - bfd *obfd; -{ - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) - return true; - - BFD_ASSERT (!elf_flags_init (obfd) - || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); - - elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; - elf_flags_init (obfd) = true; - return true; -} - /* Merge backend specific data from an object file to the output object file when linking. */ static boolean @@ -1556,7 +1775,7 @@ static boolean ppc64_elf_section_from_shdr (abfd, hdr, name) bfd *abfd; Elf64_Internal_Shdr *hdr; - char *name; + const char *name; { asection *newsect; flagword flags; @@ -1582,7 +1801,67 @@ ppc64_elf_section_from_shdr (abfd, hdr, name) or less in the order in which they are called. eg. ppc64_elf_check_relocs is called early in the link process, ppc64_elf_finish_dynamic_sections is one of the last functions - called. */ + called. + + PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that + functions have both a function code symbol and a function descriptor + symbol. A call to foo in a relocatable object file looks like: + + . .text + . x: + . bl .foo + . nop + + The function definition in another object file might be: + + . .section .opd + . foo: .quad .foo + . .quad .TOC.@tocbase + . .quad 0 + . + . .text + . .foo: blr + + When the linker resolves the call during a static link, the branch + unsurprisingly just goes to .foo and the .opd information is unused. + If the function definition is in a shared library, things are a little + different: The call goes via a plt call stub, the opd information gets + copied to the plt, and the linker patches the nop. + + . x: + . bl .foo_stub + . ld 2,40(1) + . + . + . .foo_stub: + . addis 12,2,Lfoo@toc@ha # in practice, the call stub + . addi 12,12,Lfoo@toc@l # is slightly optimised, but + . std 2,40(1) # this is the general idea + . ld 11,0(12) + . ld 2,8(12) + . mtctr 11 + . ld 11,16(12) + . bctr + . + . .section .plt + . Lfoo: reloc (R_PPC64_JMP_SLOT, foo) + + The "reloc ()" notation is supposed to indicate that the linker emits + an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd + copying. + + What are the difficulties here? Well, firstly, the relocations + examined by the linker in check_relocs are against the function code + sym .foo, while the dynamic relocation in the plt is emitted against + the function descriptor symbol, foo. Somewhere along the line, we need + to carefully copy dynamic link information from one symbol to the other. + Secondly, the generic part of the elf linker will make .foo a dynamic + symbol as is normal for most other backends. We need foo dynamic + instead, at least for an application final link. However, when + creating a shared library containing foo, we need to have both symbols + dynamic so that references to .foo are satisfied during the early + stages of linking. Otherwise the linker might decide to pull in a + definition from some other object, eg. a static library. */ /* The linker needs to keep track of the number of relocs that it decides to copy as dynamic relocs in check_relocs for each symbol. @@ -1608,21 +1887,101 @@ struct ppc_dyn_relocs selects between relative and absolute types. */ #define IS_ABSOLUTE_RELOC(RTYPE) \ - ((RTYPE) != R_PPC64_REL14 \ - && (RTYPE) != R_PPC64_REL14_BRNTAKEN \ - && (RTYPE) != R_PPC64_REL14_BRTAKEN \ - && (RTYPE) != R_PPC64_REL24 \ - && (RTYPE) != R_PPC64_REL32 \ - && (RTYPE) != R_PPC64_REL64) + ((RTYPE) != R_PPC64_REL32 \ + && (RTYPE) != R_PPC64_REL64 \ + && (RTYPE) != R_PPC64_ADDR30) + +/* Section name for stubs is the associated section name plus this + string. */ +#define STUB_SUFFIX ".stub" + +/* Linker stubs. + ppc_stub_long_branch: + Used when a 14 bit branch (or even a 24 bit branch) can't reach its + destination, but a 24 bit branch in a stub section will reach. + . b dest + + ppc_stub_plt_branch: + Similar to the above, but a 24 bit branch in the stub section won't + reach its destination. + . addis %r12,%r2,xxx@ha + . ld %r11,xxx@l(%r12) + . mtctr %r11 + . bctr + + ppc_stub_plt_call: + Used to call a function in a shared library. + . addis %r12,%r2,xxx@ha + . std %r2,40(%r1) + . ld %r11,xxx+0@l(%r12) + . ld %r2,xxx+8@l(%r12) + . mtctr %r11 + . ld %r11,xxx+16@l(%r12) + . bctr +*/ + +enum ppc_stub_type { + ppc_stub_none, + ppc_stub_long_branch, + ppc_stub_plt_branch, + ppc_stub_plt_call +}; + +struct ppc_stub_hash_entry { + + /* Base hash table entry structure. */ + struct bfd_hash_entry root; + + /* The stub section. */ + asection *stub_sec; + + /* Offset within stub_sec of the beginning of this stub. */ + bfd_vma stub_offset; + + /* Given the symbol's value and its section we can determine its final + value when building the stubs (so the stub knows where to jump. */ + bfd_vma target_value; + asection *target_section; + + enum ppc_stub_type stub_type; -/* ppc64 ELF linker hash entry. */ + /* The symbol table entry, if any, that this was derived from. */ + struct ppc_link_hash_entry *h; + + /* Where this stub is being called from, or, in the case of combined + stub sections, the first input section in the group. */ + asection *id_sec; +}; + +struct ppc_branch_hash_entry { + + /* Base hash table entry structure. */ + struct bfd_hash_entry root; + + /* Offset within .branch_lt. */ + unsigned int offset; + + /* Generation marker. */ + unsigned int iter; +}; struct ppc_link_hash_entry { struct elf_link_hash_entry elf; + /* A pointer to the most recently used stub hash entry against this + symbol. */ + struct ppc_stub_hash_entry *stub_cache; + /* Track dynamic relocs copied for this symbol. */ struct ppc_dyn_relocs *dyn_relocs; + + /* Link between function code and descriptor symbols. */ + struct elf_link_hash_entry *oh; + + /* Flag function code and descriptor symbols. */ + unsigned int is_func:1; + unsigned int is_func_descriptor:1; }; /* ppc64 ELF linker hash table. */ @@ -1631,6 +1990,34 @@ struct ppc_link_hash_table { struct elf_link_hash_table elf; + /* The stub hash table. */ + struct bfd_hash_table stub_hash_table; + + /* Another hash table for plt_branch stubs. */ + struct bfd_hash_table branch_hash_table; + + /* Linker stub bfd. */ + bfd *stub_bfd; + + /* Linker call-backs. */ + asection * (*add_stub_section) PARAMS ((const char *, asection *)); + void (*layout_sections_again) PARAMS ((void)); + + /* Array to keep track of which stub sections have been created, and + information on stub grouping. */ + struct map_stub { + /* This is the section to which stubs in the group will be attached. */ + asection *link_sec; + /* The stub section. */ + asection *stub_sec; + } *stub_group; + + /* Assorted information used by ppc64_elf_size_stubs. */ + unsigned int bfd_count; + int top_index; + asection **input_list; + Elf_Internal_Sym **all_local_syms; + /* Short-cuts to get to dynamic linker sections. */ asection *sgot; asection *srelgot; @@ -1639,17 +2026,186 @@ struct ppc_link_hash_table asection *sdynbss; asection *srelbss; asection *sglink; + asection *sfpr; + asection *sbrlt; + asection *srelbrlt; - /* Small local sym to section mapping cache. */ - struct sym_sec_cache sym_sec; -}; + /* Set on error. */ + unsigned int stub_error; -/* Get the ppc64 ELF linker hash table from a link_info structure. */ + /* Flag set when small branches are detected. Used to + select suitable defaults for the stub group size. */ + unsigned int has_14bit_branch; -#define ppc_hash_table(p) \ - ((struct ppc_link_hash_table *) ((p)->hash)) + /* Set if we detect a reference undefined weak symbol. */ + unsigned int have_undefweak; -/* Create an entry in a ppc64 ELF linker hash table. */ + /* Incremented every time we size stubs. */ + unsigned int stub_iteration; + + /* Small local sym to section mapping cache. */ + struct sym_sec_cache sym_sec; +}; + +static struct bfd_hash_entry *stub_hash_newfunc + PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); +static struct bfd_hash_entry *branch_hash_newfunc + PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); +static struct bfd_hash_entry *link_hash_newfunc + PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); +static struct bfd_link_hash_table *ppc64_elf_link_hash_table_create + PARAMS ((bfd *)); +static void ppc64_elf_link_hash_table_free + PARAMS ((struct bfd_link_hash_table *)); +static char *ppc_stub_name + PARAMS ((const asection *, const asection *, + const struct ppc_link_hash_entry *, const Elf_Internal_Rela *)); +static struct ppc_stub_hash_entry *ppc_get_stub_entry + PARAMS ((const asection *, const asection *, struct elf_link_hash_entry *, + const Elf_Internal_Rela *, struct ppc_link_hash_table *)); +static struct ppc_stub_hash_entry *ppc_add_stub + PARAMS ((const char *, asection *, struct ppc_link_hash_table *)); +static boolean create_linkage_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean create_got_section + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean ppc64_elf_create_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static void ppc64_elf_copy_indirect_symbol + PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); +static boolean ppc64_elf_check_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static asection * ppc64_elf_gc_mark_hook + PARAMS ((bfd *abfd, struct bfd_link_info *info, Elf_Internal_Rela *rel, + struct elf_link_hash_entry *h, Elf_Internal_Sym *sym)); +static boolean ppc64_elf_gc_sweep_hook + PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *sec, + const Elf_Internal_Rela *relocs)); +static boolean func_desc_adjust + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean ppc64_elf_func_desc_adjust + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean ppc64_elf_adjust_dynamic_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static void ppc64_elf_hide_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, boolean)); +static boolean allocate_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean readonly_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +static enum elf_reloc_type_class ppc64_elf_reloc_type_class + PARAMS ((const Elf_Internal_Rela *)); +static boolean ppc64_elf_size_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static INLINE enum ppc_stub_type ppc_type_of_stub + PARAMS ((asection *, const Elf_Internal_Rela *, + struct ppc_link_hash_entry **, bfd_vma)); +static bfd_byte *build_plt_stub + PARAMS ((bfd *, bfd_byte *, int, int)); +static boolean ppc_build_one_stub + PARAMS ((struct bfd_hash_entry *, PTR)); +static boolean ppc_size_one_stub + PARAMS ((struct bfd_hash_entry *, PTR)); +static void group_sections + PARAMS ((struct ppc_link_hash_table *, bfd_size_type, boolean)); +static boolean get_local_syms + PARAMS ((bfd *, struct ppc_link_hash_table *)); +static boolean ppc64_elf_fake_sections + PARAMS ((bfd *, Elf64_Internal_Shdr *, asection *)); +static boolean ppc64_elf_relocate_section + PARAMS ((bfd *, struct bfd_link_info *info, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms, + asection **)); +static boolean ppc64_elf_finish_dynamic_symbol + PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, + Elf_Internal_Sym *)); +static boolean ppc64_elf_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); + +/* Get the ppc64 ELF linker hash table from a link_info structure. */ + +#define ppc_hash_table(p) \ + ((struct ppc_link_hash_table *) ((p)->hash)) + +#define ppc_stub_hash_lookup(table, string, create, copy) \ + ((struct ppc_stub_hash_entry *) \ + bfd_hash_lookup ((table), (string), (create), (copy))) + +#define ppc_branch_hash_lookup(table, string, create, copy) \ + ((struct ppc_branch_hash_entry *) \ + bfd_hash_lookup ((table), (string), (create), (copy))) + +/* Create an entry in the stub hash table. */ + +static struct bfd_hash_entry * +stub_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = bfd_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct ppc_stub_hash_entry *eh; + + /* Initialize the local fields. */ + eh = (struct ppc_stub_hash_entry *) entry; + eh->stub_sec = NULL; + eh->stub_offset = 0; + eh->target_value = 0; + eh->target_section = NULL; + eh->stub_type = ppc_stub_none; + eh->h = NULL; + eh->id_sec = NULL; + } + + return entry; +} + +/* Create an entry in the branch hash table. */ + +static struct bfd_hash_entry * +branch_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = bfd_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct ppc_branch_hash_entry *eh; + + /* Initialize the local fields. */ + eh = (struct ppc_branch_hash_entry *) entry; + eh->offset = 0; + eh->iter = 0; + } + + return entry; +} + +/* Create an entry in a ppc64 ELF linker hash table. */ static struct bfd_hash_entry * link_hash_newfunc (entry, table, string) @@ -1672,7 +2228,11 @@ link_hash_newfunc (entry, table, string) { struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry; + eh->stub_cache = NULL; eh->dyn_relocs = NULL; + eh->oh = NULL; + eh->is_func = 0; + eh->is_func_descriptor = 0; } return entry; @@ -1687,16 +2247,28 @@ ppc64_elf_link_hash_table_create (abfd) struct ppc_link_hash_table *htab; bfd_size_type amt = sizeof (struct ppc_link_hash_table); - htab = (struct ppc_link_hash_table *) bfd_alloc (abfd, amt); + htab = (struct ppc_link_hash_table *) bfd_malloc (amt); if (htab == NULL) return NULL; if (! _bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc)) { - bfd_release (abfd, htab); + free (htab); return NULL; } + /* Init the stub hash table too. */ + if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc)) + return NULL; + + /* And the branch hash table. */ + if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc)) + return NULL; + + htab->stub_bfd = NULL; + htab->add_stub_section = NULL; + htab->layout_sections_again = NULL; + htab->stub_group = NULL; htab->sgot = NULL; htab->srelgot = NULL; htab->splt = NULL; @@ -1704,11 +2276,228 @@ ppc64_elf_link_hash_table_create (abfd) htab->sdynbss = NULL; htab->srelbss = NULL; htab->sglink = NULL; + htab->sfpr = NULL; + htab->sbrlt = NULL; + htab->srelbrlt = NULL; + htab->stub_error = 0; + htab->has_14bit_branch = 0; + htab->have_undefweak = 0; + htab->stub_iteration = 0; htab->sym_sec.abfd = NULL; return &htab->elf.root; } +/* Free the derived linker hash table. */ + +static void +ppc64_elf_link_hash_table_free (hash) + struct bfd_link_hash_table *hash; +{ + struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash; + + bfd_hash_table_free (&ret->stub_hash_table); + bfd_hash_table_free (&ret->branch_hash_table); + _bfd_generic_link_hash_table_free (hash); +} + +/* Build a name for an entry in the stub hash table. */ + +static char * +ppc_stub_name (input_section, sym_sec, h, rel) + const asection *input_section; + const asection *sym_sec; + const struct ppc_link_hash_entry *h; + const Elf_Internal_Rela *rel; +{ + char *stub_name; + bfd_size_type len; + + /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31 + offsets from a sym as a branch target? In fact, we could + probably assume the addend is always zero. */ + BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend); + + if (h) + { + len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1; + stub_name = bfd_malloc (len); + if (stub_name != NULL) + { + sprintf (stub_name, "%08x_%s+%x", + input_section->id & 0xffffffff, + h->elf.root.root.string, + (int) rel->r_addend & 0xffffffff); + } + } + else + { + len = 8 + 1 + 8 + 1 + 8 + 1 + 16 + 1; + stub_name = bfd_malloc (len); + if (stub_name != NULL) + { + sprintf (stub_name, "%08x_%x:%x+%x", + input_section->id & 0xffffffff, + sym_sec->id & 0xffffffff, + (int) ELF64_R_SYM (rel->r_info) & 0xffffffff, + (int) rel->r_addend & 0xffffffff); + } + } + return stub_name; +} + +/* Look up an entry in the stub hash. Stub entries are cached because + creating the stub name takes a bit of time. */ + +static struct ppc_stub_hash_entry * +ppc_get_stub_entry (input_section, sym_sec, hash, rel, htab) + const asection *input_section; + const asection *sym_sec; + struct elf_link_hash_entry *hash; + const Elf_Internal_Rela *rel; + struct ppc_link_hash_table *htab; +{ + struct ppc_stub_hash_entry *stub_entry; + struct ppc_link_hash_entry *h = (struct ppc_link_hash_entry *) hash; + const asection *id_sec; + + /* If this input section is part of a group of sections sharing one + stub section, then use the id of the first section in the group. + Stub names need to include a section id, as there may well be + more than one stub used to reach say, printf, and we need to + distinguish between them. */ + id_sec = htab->stub_group[input_section->id].link_sec; + + if (h != NULL && h->stub_cache != NULL + && h->stub_cache->h == h + && h->stub_cache->id_sec == id_sec) + { + stub_entry = h->stub_cache; + } + else + { + char *stub_name; + + stub_name = ppc_stub_name (id_sec, sym_sec, h, rel); + if (stub_name == NULL) + return NULL; + + stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, + stub_name, false, false); + if (h != NULL) + h->stub_cache = stub_entry; + + free (stub_name); + } + + return stub_entry; +} + +/* Add a new stub entry to the stub hash. Not all fields of the new + stub entry are initialised. */ + +static struct ppc_stub_hash_entry * +ppc_add_stub (stub_name, section, htab) + const char *stub_name; + asection *section; + struct ppc_link_hash_table *htab; +{ + asection *link_sec; + asection *stub_sec; + struct ppc_stub_hash_entry *stub_entry; + + link_sec = htab->stub_group[section->id].link_sec; + stub_sec = htab->stub_group[section->id].stub_sec; + if (stub_sec == NULL) + { + stub_sec = htab->stub_group[link_sec->id].stub_sec; + if (stub_sec == NULL) + { + bfd_size_type len; + char *s_name; + + len = strlen (link_sec->name) + sizeof (STUB_SUFFIX); + s_name = bfd_alloc (htab->stub_bfd, len); + if (s_name == NULL) + return NULL; + + strcpy (s_name, link_sec->name); + strcpy (s_name + len - sizeof (STUB_SUFFIX), STUB_SUFFIX); + stub_sec = (*htab->add_stub_section) (s_name, link_sec); + if (stub_sec == NULL) + return NULL; + htab->stub_group[link_sec->id].stub_sec = stub_sec; + } + htab->stub_group[section->id].stub_sec = stub_sec; + } + + /* Enter this entry into the linker stub hash table. */ + stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name, + true, false); + if (stub_entry == NULL) + { + (*_bfd_error_handler) (_("%s: cannot create stub entry %s"), + bfd_archive_filename (section->owner), + stub_name); + return NULL; + } + + stub_entry->stub_sec = stub_sec; + stub_entry->stub_offset = 0; + stub_entry->id_sec = link_sec; + return stub_entry; +} + +/* Create sections for linker generated code. */ + +static boolean +create_linkage_sections (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + struct ppc_link_hash_table *htab; + flagword flags; + + htab = ppc_hash_table (info); + + /* Create .sfpr for code to save and restore fp regs. */ + flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY + | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); + htab->sfpr = bfd_make_section_anyway (dynobj, ".sfpr"); + if (htab->sfpr == NULL + || ! bfd_set_section_flags (dynobj, htab->sfpr, flags) + || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2)) + return false; + + /* Create .glink for lazy dynamic linking support. */ + htab->sglink = bfd_make_section_anyway (dynobj, ".glink"); + if (htab->sglink == NULL + || ! bfd_set_section_flags (dynobj, htab->sglink, flags) + || ! bfd_set_section_alignment (dynobj, htab->sglink, 2)) + return false; + + /* Create .branch_lt for plt_branch stubs. */ + flags = (SEC_ALLOC | SEC_LOAD + | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); + htab->sbrlt = bfd_make_section_anyway (dynobj, ".branch_lt"); + if (htab->sbrlt == NULL + || ! bfd_set_section_flags (dynobj, htab->sbrlt, flags) + || ! bfd_set_section_alignment (dynobj, htab->sbrlt, 3)) + return false; + + if (info->shared) + { + flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY + | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); + htab->srelbrlt = bfd_make_section (dynobj, ".rela.branch_lt"); + if (!htab->srelbrlt + || ! bfd_set_section_flags (dynobj, htab->srelbrlt, flags) + || ! bfd_set_section_alignment (dynobj, htab->srelbrlt, 3)) + return false; + } + return true; +} + /* Create .got and .rela.got sections in DYNOBJ, and set up shortcuts to them in our hash table. */ @@ -1738,8 +2527,7 @@ create_got_section (dynobj, info) return true; } -/* Create the .glink section as well as the ordinary dynamic - sections. */ +/* Create the dynamic sections, and set up shortcuts. */ static boolean ppc64_elf_create_dynamic_sections (dynobj, info) @@ -1747,7 +2535,6 @@ ppc64_elf_create_dynamic_sections (dynobj, info) struct bfd_link_info *info; { struct ppc_link_hash_table *htab; - flagword flags; htab = ppc_hash_table (info); if (!htab->sgot && !create_got_section (dynobj, info)) @@ -1766,21 +2553,6 @@ ppc64_elf_create_dynamic_sections (dynobj, info) || (!info->shared && !htab->srelbss)) abort (); - /* Our .plt just contains pointers, no code. */ - flags = bfd_get_section_flags (dynobj, htab->splt); - flags &= ~SEC_CODE; - if (! bfd_set_section_flags (dynobj, htab->splt, flags)) - return false; - - /* Create .glink for global linkage functions. */ - flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY - | SEC_LINKER_CREATED); - htab->sglink = bfd_make_section (dynobj, ".glink"); - if (htab->sglink == NULL - || ! bfd_set_section_flags (dynobj, htab->sglink, flags) - || ! bfd_set_section_alignment (dynobj, htab->sglink, 3)) - return false; - return true; } @@ -1829,12 +2601,15 @@ ppc64_elf_copy_indirect_symbol (dir, ind) eind->dyn_relocs = NULL; } + edir->is_func |= eind->is_func; + edir->is_func_descriptor |= eind->is_func_descriptor; + _bfd_elf_link_hash_copy_indirect (dir, ind); } /* Look through the relocs for a section during the first phase, and calculate needed space in the global offset table, procedure - linkage table, and dynamic reloc sections. */ + linkage table, and dynamic reloc sections. */ static boolean ppc64_elf_check_relocs (abfd, info, sec, relocs) @@ -1849,6 +2624,7 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; asection *sreloc; + boolean is_opd; if (info->relocateable) return true; @@ -1863,6 +2639,13 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) sym_hashes_end -= symtab_hdr->sh_info; sreloc = NULL; + is_opd = strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0; + + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + if (htab->sfpr == NULL + && !create_linkage_sections (htab->elf.dynobj, info)) + return false; rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) @@ -1889,13 +2672,9 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) case R_PPC64_GOT16_LO_DS: /* This symbol requires a global offset table entry. */ - if (htab->sgot == NULL) - { - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - if (!create_got_section (htab->elf.dynobj, info)) - return false; - } + if (htab->sgot == NULL + && !create_got_section (htab->elf.dynobj, info)) + return false; if (h != NULL) { @@ -1943,6 +2722,7 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; h->plt.refcount += 1; + ((struct ppc_link_hash_entry *) h)->is_func = 1; break; /* The following relocations don't need to propagate the @@ -1976,12 +2756,47 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) return false; break; - case R_PPC64_REL64: - case R_PPC64_REL32: - case R_PPC64_REL24: case R_PPC64_REL14: case R_PPC64_REL14_BRTAKEN: case R_PPC64_REL14_BRNTAKEN: + htab->has_14bit_branch = 1; + /* Fall through. */ + + case R_PPC64_REL24: + if (h != NULL + && h->root.root.string[0] == '.' + && h->root.root.string[1] != 0) + { + /* We may need a .plt entry if the function this reloc + refers to is in a shared lib. */ + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + h->plt.refcount += 1; + ((struct ppc_link_hash_entry *) h)->is_func = 1; + } + break; + + case R_PPC64_ADDR64: + if (is_opd + && h != NULL + && h->root.root.string[0] == '.' + && h->root.root.string[1] != 0) + { + struct elf_link_hash_entry *fdh; + + fdh = elf_link_hash_lookup (&htab->elf, h->root.root.string + 1, + false, false, false); + if (fdh != NULL) + { + ((struct ppc_link_hash_entry *) fdh)->is_func_descriptor = 1; + ((struct ppc_link_hash_entry *) fdh)->oh = h; + ((struct ppc_link_hash_entry *) h)->is_func = 1; + ((struct ppc_link_hash_entry *) h)->oh = fdh; + } + } + /* Fall through. */ + + case R_PPC64_REL64: + case R_PPC64_REL32: case R_PPC64_ADDR14: case R_PPC64_ADDR14_BRNTAKEN: case R_PPC64_ADDR14_BRTAKEN: @@ -1998,11 +2813,14 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) case R_PPC64_ADDR24: case R_PPC64_ADDR30: case R_PPC64_ADDR32: - case R_PPC64_ADDR64: case R_PPC64_UADDR16: case R_PPC64_UADDR32: case R_PPC64_UADDR64: case R_PPC64_TOC: + /* Don't propagate .opd relocs. */ + if (NO_OPD_RELOCS && is_opd) + break; + /* If we are creating a shared library, and this is a reloc against a global symbol, or a non PC relative reloc against a local symbol, then we need to copy the reloc @@ -2064,11 +2882,9 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) (*_bfd_error_handler) (_("%s: bad relocation section name `%s\'"), bfd_archive_filename (abfd), name); + bfd_set_error (bfd_error_bad_value); } - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - dynobj = htab->elf.dynobj; sreloc = bfd_get_section_by_name (dynobj, name); if (sreloc == NULL) @@ -2132,6 +2948,7 @@ ppc64_elf_check_relocs (abfd, info, sec, relocs) break; default: + break; } } @@ -2177,13 +2994,7 @@ ppc64_elf_gc_mark_hook (abfd, info, rel, h, sym) } else { - if (! (elf_bad_symtab (abfd) - && 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 (abfd, sym->st_shndx); - } + return bfd_section_from_elf_index (abfd, sym->st_shndx); } return NULL; @@ -2257,6 +3068,14 @@ ppc64_elf_gc_sweep_hook (abfd, info, sec, relocs) case R_PPC64_REL14_BRNTAKEN: case R_PPC64_REL14_BRTAKEN: case R_PPC64_REL24: + if (r_symndx >= symtab_hdr->sh_info) + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + if (h->plt.refcount > 0) + h->plt.refcount--; + } + break; + case R_PPC64_REL32: case R_PPC64_REL64: if (r_symndx >= symtab_hdr->sh_info) @@ -2328,80 +3147,273 @@ ppc64_elf_gc_sweep_hook (abfd, info, sec, relocs) return true; } -/* Adjust a symbol defined by a dynamic object and referenced by a - regular object. The current definition is in some section of the - dynamic object, but we're not including those sections. We have to - change the definition to something the rest of the link can - understand. */ - +/* Called via elf_link_hash_traverse to transfer dynamic linking + information on function code symbol entries to their corresponding + function descriptor symbol entries. */ static boolean -ppc64_elf_adjust_dynamic_symbol (info, h) - struct bfd_link_info *info; +func_desc_adjust (h, inf) struct elf_link_hash_entry *h; + PTR inf; { + struct bfd_link_info *info; struct ppc_link_hash_table *htab; - struct ppc_link_hash_entry * eh; - struct ppc_dyn_relocs *p; - asection *s; - unsigned int power_of_two; + if (h->root.type == bfd_link_hash_indirect) + return true; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + info = (struct bfd_link_info *) inf; htab = ppc_hash_table (info); - /* If this is a function, put it in the procedure linkage table. We - will fill in the contents of the procedure linkage table later. */ - if (h->type == STT_FUNC - || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) + /* If this is a function code symbol, transfer dynamic linking + information to the function descriptor symbol. */ + if (!((struct ppc_link_hash_entry *) h)->is_func) + return true; + + if (h->root.type == bfd_link_hash_undefweak + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR)) + htab->have_undefweak = true; + + if (h->plt.refcount > 0 + && h->root.root.string[0] == '.' + && h->root.root.string[1] != '\0') { - struct elf_link_hash_entry *fdh; + struct elf_link_hash_entry *fdh = ((struct ppc_link_hash_entry *) h)->oh; + boolean force_local; - /* If it's a function entry point, the name starts with a dot - unless someone has written some poor assembly code. The ABI - for .plt calls requires that there be a function descriptor - sym which has the name of the function minus the dot. */ - - if (h->plt.refcount <= 0 - || h->root.root.string[0] != '.' - || h->root.root.string[1] == '\0' - || (! info->shared - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) - { - /* This case can occur if we saw a PLT reloc in an input - file, but the symbol was never referred to by a dynamic - object, or if all references were garbage collected. In - such a case, we don't actually need to build a procedure - linkage table entry. */ - h->plt.offset = (bfd_vma) -1; - h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; - return true; - } - - /* Find the corresponding function descriptor symbol. Create it - as undefined if necessary. ppc_elf64_finish_dynamic_symbol - will look it up again and create a JMP_SLOT reloc for it. */ - - fdh = elf_link_hash_lookup (elf_hash_table (info), - h->root.root.string + 1, - false, false, false); + /* Find the corresponding function descriptor symbol. Create it + as undefined if necessary. */ if (fdh == NULL) + fdh = elf_link_hash_lookup (&htab->elf, h->root.root.string + 1, + false, false, true); + + if (fdh == NULL + && info->shared + && (h->root.type == bfd_link_hash_undefined + || h->root.type == bfd_link_hash_undefweak)) { + bfd *abfd; asymbol *newsym; - /* Create it as undefined. */ - newsym = bfd_make_empty_symbol (htab->elf.dynobj); + abfd = h->root.u.undef.abfd; + newsym = bfd_make_empty_symbol (abfd); newsym->name = h->root.root.string + 1; newsym->section = bfd_und_section_ptr; newsym->value = 0; - newsym->flags = BSF_DYNAMIC | BSF_OBJECT; + newsym->flags = BSF_OBJECT; + if (h->root.type == bfd_link_hash_undefweak) + newsym->flags |= BSF_WEAK; if ( !(_bfd_generic_link_add_one_symbol - (info, htab->elf.dynobj, newsym->name, newsym->flags, + (info, abfd, newsym->name, newsym->flags, newsym->section, newsym->value, NULL, false, false, (struct bfd_link_hash_entry **) &fdh))) { return false; } + fdh->elf_link_hash_flags &= ~ELF_LINK_NON_ELF; + } + + if (fdh != NULL + && (fdh->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0 + && (info->shared + || (fdh->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + || (fdh->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)) + { + if (fdh->dynindx == -1) + if (! bfd_elf64_link_record_dynamic_symbol (info, fdh)) + return false; + fdh->elf_link_hash_flags |= (h->elf_link_hash_flags + & (ELF_LINK_HASH_REF_REGULAR + | ELF_LINK_HASH_REF_DYNAMIC + | ELF_LINK_HASH_REF_REGULAR_NONWEAK + | ELF_LINK_NON_GOT_REF)); + if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) + { + fdh->plt.refcount = h->plt.refcount; + fdh->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + } + ((struct ppc_link_hash_entry *) fdh)->is_func_descriptor = 1; + ((struct ppc_link_hash_entry *) fdh)->oh = h; + ((struct ppc_link_hash_entry *) h)->oh = fdh; + } + + /* Now that the info is on the function descriptor, clear the + function code sym info. Any function code syms for which we + don't have a definition in a regular file, we force local. + This prevents a shared library from exporting syms that have + been imported from another library. Function code syms that + are really in the library we must leave global to prevent the + linker dragging in a definition from a static library. */ + force_local = (info->shared + && ((h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0 + || fdh == NULL + || (fdh->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0 + || (fdh->elf_link_hash_flags + & ELF_LINK_FORCED_LOCAL) != 0)); + _bfd_elf_link_hash_hide_symbol (info, h, force_local); + } + + return true; +} + +#define MIN_SAVE_FPR 14 +#define MAX_SAVE_FPR 31 + +/* Called near the start of bfd_elf_size_dynamic_sections. We use + this hook to a) provide some gcc support functions, and b) transfer + dynamic linking information gathered so far on function code symbol + entries, to their corresponding function descriptor symbol entries. */ +static boolean +ppc64_elf_func_desc_adjust (obfd, info) + bfd *obfd ATTRIBUTE_UNUSED; + struct bfd_link_info *info; +{ + struct ppc_link_hash_table *htab; + unsigned int lowest_savef = MAX_SAVE_FPR + 2; + unsigned int lowest_restf = MAX_SAVE_FPR + 2; + unsigned int i; + struct elf_link_hash_entry *h; + bfd_byte *p; + char sym[10]; + + htab = ppc_hash_table (info); + + if (htab->sfpr == NULL) + /* We don't have any relocs. */ + return true; + + /* First provide any missing ._savef* and ._restf* functions. */ + memcpy (sym, "._savef14", 10); + for (i = MIN_SAVE_FPR; i <= MAX_SAVE_FPR; i++) + { + sym[7] = i / 10 + '0'; + sym[8] = i % 10 + '0'; + h = elf_link_hash_lookup (&htab->elf, sym, false, false, true); + if (h != NULL + && h->root.type == bfd_link_hash_undefined) + { + if (lowest_savef > i) + lowest_savef = i; + h->root.type = bfd_link_hash_defined; + h->root.u.def.section = htab->sfpr; + h->root.u.def.value = (i - lowest_savef) * 4; + h->type = STT_FUNC; + h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; + _bfd_elf_link_hash_hide_symbol (info, h, info->shared); + } + } + + memcpy (sym, "._restf14", 10); + for (i = MIN_SAVE_FPR; i <= MAX_SAVE_FPR; i++) + { + sym[7] = i / 10 + '0'; + sym[8] = i % 10 + '0'; + h = elf_link_hash_lookup (&htab->elf, sym, false, false, true); + if (h != NULL + && h->root.type == bfd_link_hash_undefined) + { + if (lowest_restf > i) + lowest_restf = i; + h->root.type = bfd_link_hash_defined; + h->root.u.def.section = htab->sfpr; + h->root.u.def.value = ((MAX_SAVE_FPR + 2 - lowest_savef) * 4 + + (i - lowest_restf) * 4); + h->type = STT_FUNC; + h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; + _bfd_elf_link_hash_hide_symbol (info, h, info->shared); + } + } + + elf_link_hash_traverse (&htab->elf, func_desc_adjust, (PTR) info); + + htab->sfpr->_raw_size = ((MAX_SAVE_FPR + 2 - lowest_savef) * 4 + + (MAX_SAVE_FPR + 2 - lowest_restf) * 4); + + if (htab->sfpr->_raw_size == 0) + { + if (!htab->have_undefweak) + { + _bfd_strip_section_from_output (info, htab->sfpr); + return true; + } + + htab->sfpr->_raw_size = 4; + } + + p = (bfd_byte *) bfd_alloc (htab->elf.dynobj, htab->sfpr->_raw_size); + if (p == NULL) + return false; + htab->sfpr->contents = p; + + for (i = lowest_savef; i <= MAX_SAVE_FPR; i++) + { + unsigned int fpr = i << 21; + unsigned int stackoff = (1 << 16) - (MAX_SAVE_FPR + 1 - i) * 8; + bfd_put_32 (htab->elf.dynobj, STFD_FR0_0R1 + fpr + stackoff, p); + p += 4; + } + if (lowest_savef <= MAX_SAVE_FPR) + { + bfd_put_32 (htab->elf.dynobj, BLR, p); + p += 4; + } + + for (i = lowest_restf; i <= MAX_SAVE_FPR; i++) + { + unsigned int fpr = i << 21; + unsigned int stackoff = (1 << 16) - (MAX_SAVE_FPR + 1 - i) * 8; + bfd_put_32 (htab->elf.dynobj, LFD_FR0_0R1 + fpr + stackoff, p); + p += 4; + } + if (lowest_restf <= MAX_SAVE_FPR + || htab->sfpr->_raw_size == 4) + { + bfd_put_32 (htab->elf.dynobj, BLR, p); + } + + return true; +} + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ + +static boolean +ppc64_elf_adjust_dynamic_symbol (info, h) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; +{ + struct ppc_link_hash_table *htab; + struct ppc_link_hash_entry * eh; + struct ppc_dyn_relocs *p; + asection *s; + unsigned int power_of_two; + + htab = ppc_hash_table (info); + + /* Deal with function syms. */ + if (h->type == STT_FUNC + || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) + { + /* Clear procedure linkage table information for any symbol that + won't need a .plt entry. */ + if (!((struct ppc_link_hash_entry *) h)->is_func_descriptor + || h->plt.refcount <= 0 + || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 + || (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) + { + h->plt.offset = (bfd_vma) -1; + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; } return true; } @@ -2444,7 +3456,7 @@ ppc64_elf_adjust_dynamic_symbol (info, h) } /* If we didn't find any dynamic relocs in read-only sections, then - we'll be keeping the dynamic relocs and avoiding the copy reloc. */ + we'll be keeping the dynamic relocs and avoiding the copy reloc. */ if (p == NULL) { h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; @@ -2496,6 +3508,65 @@ ppc64_elf_adjust_dynamic_symbol (info, h) return true; } +/* If given a function descriptor symbol, hide both the function code + sym and the descriptor. */ +static void +ppc64_elf_hide_symbol (info, h, force_local) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; + boolean force_local; +{ + _bfd_elf_link_hash_hide_symbol (info, h, force_local); + + if (((struct ppc_link_hash_entry *) h)->is_func_descriptor) + { + struct elf_link_hash_entry *fh = ((struct ppc_link_hash_entry *) h)->oh; + + if (fh == NULL) + { + const char *p, *q; + struct ppc_link_hash_table *htab; + char save; + + /* We aren't supposed to use alloca in BFD because on + systems which do not have alloca the version in libiberty + calls xmalloc, which might cause the program to crash + when it runs out of memory. This function doesn't have a + return status, so there's no way to gracefully return an + error. So cheat. We know that string[-1] can be safely + dereferenced; It's either a string in an ELF string + table, or allocated in an objalloc structure. */ + + p = h->root.root.string - 1; + save = *p; + *(char *) p = '.'; + htab = ppc_hash_table (info); + fh = elf_link_hash_lookup (&htab->elf, p, false, false, false); + *(char *) p = save; + + /* Unfortunately, if it so happens that the string we were + looking for was allocated immediately before this string, + then we overwrote the string terminator. That's the only + reason the lookup should fail. */ + if (fh == NULL) + { + q = h->root.root.string + strlen (h->root.root.string); + while (q >= h->root.root.string && *q == *p) + --q, --p; + if (q < h->root.root.string && *p == '.') + fh = elf_link_hash_lookup (&htab->elf, p, false, false, false); + } + if (fh != NULL) + { + ((struct ppc_link_hash_entry *) h)->oh = fh; + ((struct ppc_link_hash_entry *) fh)->oh = h; + } + } + if (fh != NULL) + _bfd_elf_link_hash_hide_symbol (info, fh, force_local); + } +} + /* This is the condition under which ppc64_elf_finish_dynamic_symbol will be called from elflink.h. If elflink.h doesn't call our finish_dynamic_symbol routine, we'll need to do something about @@ -2521,52 +3592,23 @@ allocate_dynrelocs (h, inf) struct ppc_link_hash_entry *eh; struct ppc_dyn_relocs *p; - if (h->root.type == bfd_link_hash_indirect - || h->root.type == bfd_link_hash_warning) + if (h->root.type == bfd_link_hash_indirect) return true; + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + info = (struct bfd_link_info *) inf; htab = ppc_hash_table (info); if (htab->elf.dynamic_sections_created - && h->plt.refcount > 0) + && h->plt.refcount > 0 + && h->dynindx != -1) { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) - { - if (! bfd_elf64_link_record_dynamic_symbol (info, h)) - return false; - } - - BFD_ASSERT (h->root.root.string[0] == '.' - && h->root.root.string[1] != '\0'); + BFD_ASSERT (((struct ppc_link_hash_entry *) h)->is_func_descriptor); if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) { - /* Make sure the corresponding function descriptor symbol is - dynamic too. */ - - if (h->dynindx != -1) - { - struct elf_link_hash_entry *fdh; - - fdh = elf_link_hash_lookup (elf_hash_table (info), - h->root.root.string + 1, - false, false, false); - - if (fdh == NULL) - abort (); - - if (fdh->dynindx == -1 - && (fdh->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) - { - if (! bfd_elf64_link_record_dynamic_symbol (info, fdh)) - return false; - } - } - /* If this is the first .plt entry, make room for the special first entry. */ s = htab->splt; @@ -2578,17 +3620,14 @@ allocate_dynrelocs (h, inf) /* Make room for this entry. */ s->_raw_size += PLT_ENTRY_SIZE; - /* Point the function at the linkage stub. This works because - the only references to the function code sym are calls. - Function pointer comparisons use the function descriptor. */ + /* Make room for the .glink code. */ s = htab->sglink; - h->root.type = bfd_link_hash_defined; - h->root.u.def.section = s; - h->root.u.def.value = s->_raw_size; - h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; - - /* Make room for global linkage code in .glink. */ - s->_raw_size += PPC64_ELF_GLINK_SIZE; + if (s->_raw_size == 0) + s->_raw_size += GLINK_CALL_STUB_SIZE; + /* We need bigger stubs past index 32767. */ + if (s->_raw_size >= GLINK_CALL_STUB_SIZE + 32768*2*4) + s->_raw_size += 4; + s->_raw_size += 2*4; /* We also need to make an entry in the .rela.plt section. */ s = htab->srelplt; @@ -2711,6 +3750,9 @@ readonly_dynrelocs (h, inf) struct ppc_link_hash_entry *eh; struct ppc_dyn_relocs *p; + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + eh = (struct ppc_link_hash_entry *) h; for (p = eh->dyn_relocs; p != NULL; p = p->next) { @@ -2790,10 +3832,12 @@ ppc64_elf_size_dynamic_sections (output_bfd, info) linker script /DISCARD/, so we'll be discarding the relocs too. */ } - else + else if (p->count != 0) { srel = elf_section_data (p->sec)->sreloc; srel->_raw_size += p->count * sizeof (Elf64_External_Rela); + if ((p->sec->output_section->flags & SEC_READONLY) != 0) + info->flags |= DF_TEXTREL; } } } @@ -2833,173 +3877,1170 @@ ppc64_elf_size_dynamic_sections (output_bfd, info) if ((s->flags & SEC_LINKER_CREATED) == 0) continue; - if (s == htab->splt - || s == htab->sgot - || s == htab->sglink) - { - /* Strip this section if we don't need it; see the - comment below. */ - } - else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) - { - if (s->_raw_size == 0) - { - /* If we don't need this section, strip it from the - output file. This is mostly to handle .rela.bss and - .rela.plt. We must create both sections in - create_dynamic_sections, because they must be created - before the linker maps input sections to output - sections. The linker does that before - adjust_dynamic_symbol is called, and it is that - function which decides whether anything needs to go - into these sections. */ - } - else - { - if (s != htab->srelplt) - relocs = true; + if (s == htab->sbrlt || s == htab->srelbrlt) + /* These haven't been allocated yet; don't strip. */ + continue; + else if (s == htab->splt + || s == htab->sgot + || s == htab->sglink) + { + /* Strip this section if we don't need it; see the + comment below. */ + } + else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) + { + if (s->_raw_size == 0) + { + /* If we don't need this section, strip it from the + output file. This is mostly to handle .rela.bss and + .rela.plt. We must create both sections in + create_dynamic_sections, because they must be created + before the linker maps input sections to output + sections. The linker does that before + adjust_dynamic_symbol is called, and it is that + function which decides whether anything needs to go + into these sections. */ + } + else + { + if (s != htab->srelplt) + relocs = true; + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (s->_raw_size == 0) + { + _bfd_strip_section_from_output (info, s); + continue; + } + + /* .plt is in the bss section. We don't initialise it. */ + if ((s->flags & SEC_LOAD) == 0) + continue; + + /* Allocate memory for the section contents. We use bfd_zalloc + here in case unused entries are not reclaimed before the + section's contents are written out. This should not happen, + but this way if it does, we get a R_PPC64_NONE reloc instead + of garbage. */ + s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); + if (s->contents == NULL) + return false; + } + + if (htab->elf.dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in ppc64_elf_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ +#define add_dynamic_entry(TAG, VAL) \ + bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) + + if (!info->shared) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return false; + } + + if (htab->splt != NULL && htab->splt->_raw_size != 0) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0) + || !add_dynamic_entry (DT_PPC64_GLINK, 0)) + return false; + } + + if (NO_OPD_RELOCS) + { + if (!add_dynamic_entry (DT_PPC64_OPD, 0) + || !add_dynamic_entry (DT_PPC64_OPDSZ, 0)) + return false; + } + + if (relocs) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) + return false; + + /* If any dynamic relocs apply to a read-only section, + then we need a DT_TEXTREL entry. */ + if ((info->flags & DF_TEXTREL) == 0) + elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, + (PTR) info); + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return false; + } + } + } +#undef add_dynamic_entry + + return true; +} + +/* Determine the type of stub needed, if any, for a call. */ + +static INLINE enum ppc_stub_type +ppc_type_of_stub (input_sec, rel, hash, destination) + asection *input_sec; + const Elf_Internal_Rela *rel; + struct ppc_link_hash_entry **hash; + bfd_vma destination; +{ + struct ppc_link_hash_entry *h = *hash; + bfd_vma location; + bfd_vma branch_offset; + bfd_vma max_branch_offset; + unsigned int r_type; + + if (h != NULL) + { + if (h->oh != NULL + && h->oh->plt.offset != (bfd_vma) -1 + && h->oh->dynindx != -1) + { + *hash = (struct ppc_link_hash_entry *) h->oh; + return ppc_stub_plt_call; + } + + if (h->elf.root.type == bfd_link_hash_undefweak + || h->elf.root.type == bfd_link_hash_undefined) + return ppc_stub_none; + } + + /* Determine where the call point is. */ + location = (input_sec->output_offset + + input_sec->output_section->vma + + rel->r_offset); + + branch_offset = destination - location; + r_type = ELF64_R_TYPE (rel->r_info); + + /* Determine if a long branch stub is needed. */ + max_branch_offset = 1 << 25; + if (r_type != (unsigned int) R_PPC64_REL24) + max_branch_offset = 1 << 15; + + if (branch_offset + max_branch_offset >= 2 * max_branch_offset) + /* We need a stub. Figure out whether a long_branch or plt_branch + is needed later. */ + return ppc_stub_long_branch; + + return ppc_stub_none; +} + +/* Build a .plt call stub. */ + +static bfd_byte * +build_plt_stub (obfd, p, offset, glink) + bfd *obfd; + bfd_byte *p; + int offset; + int glink; +{ +#define PPC_LO(v) ((v) & 0xffff) +#define PPC_HI(v) (((v) >> 16) & 0xffff) +#define PPC_HA(v) PPC_HI ((v) + 0x8000) + + if (glink) + bfd_put_32 (obfd, LD_R2_40R1, p), p += 4; + bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; + if (!glink) + bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; + bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; + if (PPC_HA (offset + 8) != PPC_HA (offset)) + bfd_put_32 (obfd, ADDIS_R12_R12_1, p), p += 4; + offset += 8; + bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset), p), p += 4; + if (PPC_HA (offset + 8) != PPC_HA (offset)) + bfd_put_32 (obfd, ADDIS_R12_R12_1, p), p += 4; + offset += 8; + bfd_put_32 (obfd, MTCTR_R11, p), p += 4; + bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; + bfd_put_32 (obfd, BCTR, p), p += 4; + return p; +} + +static boolean +ppc_build_one_stub (gen_entry, in_arg) + struct bfd_hash_entry *gen_entry; + PTR in_arg; +{ + struct ppc_stub_hash_entry *stub_entry; + struct ppc_branch_hash_entry *br_entry; + struct bfd_link_info *info; + struct ppc_link_hash_table *htab; + asection *stub_sec; + bfd *stub_bfd; + bfd_byte *loc; + bfd_byte *p; + unsigned int indx; + bfd_vma off; + int size; + + /* Massage our args to the form they really have. */ + stub_entry = (struct ppc_stub_hash_entry *) gen_entry; + info = (struct bfd_link_info *) in_arg; + + htab = ppc_hash_table (info); + stub_sec = stub_entry->stub_sec; + + /* Make a note of the offset within the stubs for this entry. */ + stub_entry->stub_offset = stub_sec->_cooked_size; + loc = stub_sec->contents + stub_entry->stub_offset; + + stub_bfd = stub_sec->owner; + + switch (stub_entry->stub_type) + { + case ppc_stub_long_branch: + /* Branches are relative. This is where we are going to. */ + off = (stub_entry->target_value + + stub_entry->target_section->output_offset + + stub_entry->target_section->output_section->vma); + + /* And this is where we are coming from. */ + off -= (stub_entry->stub_offset + + stub_sec->output_offset + + stub_sec->output_section->vma); + + BFD_ASSERT (off + (1 << 25) < (bfd_vma) (1 << 26)); + + bfd_put_32 (stub_bfd, (bfd_vma) B_DOT | (off & 0x3fffffc), loc); + size = 4; + break; + + case ppc_stub_plt_branch: + br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, + stub_entry->root.string + 9, + false, false); + if (br_entry == NULL) + { + (*_bfd_error_handler) (_("can't find branch stub `%s'"), + stub_entry->root.string + 9); + htab->stub_error = true; + return false; + } + + off = (stub_entry->target_value + + stub_entry->target_section->output_offset + + stub_entry->target_section->output_section->vma); + + bfd_put_64 (htab->sbrlt->owner, off, + htab->sbrlt->contents + br_entry->offset); + + if (info->shared) + { + /* Create a reloc for the branch lookup table entry. */ + Elf_Internal_Rela rela; + Elf64_External_Rela *r; + + rela.r_offset = (br_entry->offset + + htab->sbrlt->output_offset + + htab->sbrlt->output_section->vma); + rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); + rela.r_addend = off; + + r = (Elf64_External_Rela *) htab->srelbrlt->contents; + r += htab->srelbrlt->reloc_count++; + bfd_elf64_swap_reloca_out (htab->srelbrlt->owner, &rela, r); + } + + off = (br_entry->offset + + htab->sbrlt->output_offset + + htab->sbrlt->output_section->vma + - elf_gp (htab->sbrlt->output_section->owner) + - TOC_BASE_OFF); + + if (off + 0x80000000 > 0xffffffff || (off & 7) != 0) + { + (*_bfd_error_handler) + (_("linkage table error against `%s'"), + stub_entry->root.string); + bfd_set_error (bfd_error_bad_value); + htab->stub_error = true; + return false; + } + + indx = off; + bfd_put_32 (stub_bfd, (bfd_vma) ADDIS_R12_R2 | PPC_HA (indx), loc); + bfd_put_32 (stub_bfd, (bfd_vma) LD_R11_0R12 | PPC_LO (indx), loc + 4); + bfd_put_32 (stub_bfd, (bfd_vma) MTCTR_R11, loc + 8); + bfd_put_32 (stub_bfd, (bfd_vma) BCTR, loc + 12); + size = 16; + break; + + case ppc_stub_plt_call: + /* Build the .glink lazy link call stub. */ + p = htab->sglink->contents + htab->sglink->_cooked_size; + indx = htab->sglink->reloc_count; + if (indx < 0x8000) + { + bfd_put_32 (htab->sglink->owner, LI_R0_0 | indx, p); + p += 4; + } + else + { + bfd_put_32 (htab->sglink->owner, LIS_R0_0 | PPC_HI (indx), p); + p += 4; + bfd_put_32 (htab->sglink->owner, ORI_R0_R0_0 | PPC_LO (indx), p); + p += 4; + } + bfd_put_32 (htab->sglink->owner, + B_DOT | ((htab->sglink->contents - p) & 0x3fffffc), p); + p += 4; + htab->sglink->_cooked_size = p - htab->sglink->contents; + htab->sglink->reloc_count += 1; + + /* Do the best we can for shared libraries built without + exporting ".foo" for each "foo". This can happen when symbol + versioning scripts strip all bar a subset of symbols. */ + if (stub_entry->h->oh->root.type != bfd_link_hash_defined + && stub_entry->h->oh->root.type != bfd_link_hash_defweak) + { + /* Point the symbol at the stub. There may be multiple stubs, + we don't really care; The main thing is to make this sym + defined somewhere. */ + stub_entry->h->oh->root.type = bfd_link_hash_defined; + stub_entry->h->oh->root.u.def.section = stub_entry->stub_sec; + stub_entry->h->oh->root.u.def.value = stub_entry->stub_offset; + } + + /* Now build the stub. */ + off = stub_entry->h->elf.plt.offset; + if (off >= (bfd_vma) -2) + abort (); + + off &= ~ (bfd_vma) 1; + off += (htab->splt->output_offset + + htab->splt->output_section->vma + - elf_gp (htab->splt->output_section->owner) + - TOC_BASE_OFF); + + if (off + 0x80000000 > 0xffffffff || (off & 7) != 0) + { + (*_bfd_error_handler) + (_("linkage table error against `%s'"), + stub_entry->h->elf.root.root.string); + bfd_set_error (bfd_error_bad_value); + htab->stub_error = true; + return false; + } + + p = build_plt_stub (stub_bfd, loc, (int) off, 0); + size = p - loc; + break; + + default: + BFD_FAIL (); + return false; + } + + stub_sec->_cooked_size += size; + return true; +} + +/* As above, but don't actually build the stub. Just bump offset so + we know stub section sizes, and select plt_branch stubs where + long_branch stubs won't do. */ + +static boolean +ppc_size_one_stub (gen_entry, in_arg) + struct bfd_hash_entry *gen_entry; + PTR in_arg; +{ + struct ppc_stub_hash_entry *stub_entry; + struct ppc_link_hash_table *htab; + bfd_vma off; + int size; + + /* Massage our args to the form they really have. */ + stub_entry = (struct ppc_stub_hash_entry *) gen_entry; + htab = (struct ppc_link_hash_table *) in_arg; + + if (stub_entry->stub_type == ppc_stub_plt_call) + { + off = stub_entry->h->elf.plt.offset & ~(bfd_vma) 1; + off += (htab->splt->output_offset + + htab->splt->output_section->vma + - elf_gp (htab->splt->output_section->owner) + - TOC_BASE_OFF); + + size = 28; + if (PPC_HA ((int) off + 16) != PPC_HA ((int) off)) + size += 4; + } + else + { + /* ppc_stub_long_branch or ppc_stub_plt_branch. */ + stub_entry->stub_type = ppc_stub_long_branch; + size = 4; + + off = (stub_entry->target_value + + stub_entry->target_section->output_offset + + stub_entry->target_section->output_section->vma); + off -= (stub_entry->stub_sec->_raw_size + + stub_entry->stub_sec->output_offset + + stub_entry->stub_sec->output_section->vma); + + if (off + (1 << 25) >= (bfd_vma) (1 << 26)) + { + struct ppc_branch_hash_entry *br_entry; + + br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, + stub_entry->root.string + 9, + true, false); + if (br_entry == NULL) + { + (*_bfd_error_handler) (_("can't build branch stub `%s'"), + stub_entry->root.string + 9); + htab->stub_error = true; + return false; + } + + if (br_entry->iter != htab->stub_iteration) + { + br_entry->iter = htab->stub_iteration; + br_entry->offset = htab->sbrlt->_raw_size; + htab->sbrlt->_raw_size += 8; + } + stub_entry->stub_type = ppc_stub_plt_branch; + size = 16; + } + } + + stub_entry->stub_sec->_raw_size += size; + return true; +} + +/* Set up various things so that we can make a list of input sections + for each output section included in the link. Returns -1 on error, + 0 when no stubs will be needed, and 1 on success. */ + +int +ppc64_elf_setup_section_lists (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *input_bfd; + unsigned int bfd_count; + int top_id, top_index; + asection *section; + asection **input_list, **list; + bfd_size_type amt; + struct ppc_link_hash_table *htab = ppc_hash_table (info); + + if (htab->elf.root.creator->flavour != bfd_target_elf_flavour + || htab->sbrlt == NULL) + return 0; + + /* Count the number of input BFDs and find the top input section id. */ + for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next) + { + bfd_count += 1; + for (section = input_bfd->sections; + section != NULL; + section = section->next) + { + if (top_id < section->id) + top_id = section->id; + } + } + htab->bfd_count = bfd_count; + + amt = sizeof (struct map_stub) * (top_id + 1); + htab->stub_group = (struct map_stub *) bfd_zmalloc (amt); + if (htab->stub_group == NULL) + return -1; + + /* We can't use output_bfd->section_count here to find the top output + section index as some sections may have been removed, and + _bfd_strip_section_from_output doesn't renumber the indices. */ + for (section = output_bfd->sections, top_index = 0; + section != NULL; + section = section->next) + { + if (top_index < section->index) + top_index = section->index; + } + + htab->top_index = top_index; + amt = sizeof (asection *) * (top_index + 1); + input_list = (asection **) bfd_malloc (amt); + htab->input_list = input_list; + if (input_list == NULL) + return -1; + + /* For sections we aren't interested in, mark their entries with a + value we can check later. */ + list = input_list + top_index; + do + *list = bfd_abs_section_ptr; + while (list-- != input_list); + + for (section = output_bfd->sections; + section != NULL; + section = section->next) + { + if ((section->flags & SEC_CODE) != 0) + input_list[section->index] = NULL; + } + + return 1; +} + +/* The linker repeatedly calls this function for each input section, + in the order that input sections are linked into output sections. + Build lists of input sections to determine groupings between which + we may insert linker stubs. */ + +void +ppc64_elf_next_input_section (info, isec) + struct bfd_link_info *info; + asection *isec; +{ + struct ppc_link_hash_table *htab = ppc_hash_table (info); + + if (isec->output_section->index <= htab->top_index) + { + asection **list = htab->input_list + isec->output_section->index; + if (*list != bfd_abs_section_ptr) + { + /* Steal the link_sec pointer for our list. */ +#define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) + /* This happens to make the list in reverse order, + which is what we want. */ + PREV_SEC (isec) = *list; + *list = isec; + } + } +} + +/* See whether we can group stub sections together. Grouping stub + sections may result in fewer stubs. More importantly, we need to + put all .init* and .fini* stubs at the beginning of the .init or + .fini output sections respectively, because glibc splits the + _init and _fini functions into multiple parts. Putting a stub in + the middle of a function is not a good idea. */ + +static void +group_sections (htab, stub_group_size, stubs_always_before_branch) + struct ppc_link_hash_table *htab; + bfd_size_type stub_group_size; + boolean stubs_always_before_branch; +{ + asection **list = htab->input_list + htab->top_index; + do + { + asection *tail = *list; + if (tail == bfd_abs_section_ptr) + continue; + while (tail != NULL) + { + asection *curr; + asection *prev; + bfd_size_type total; + + curr = tail; + if (tail->_cooked_size) + total = tail->_cooked_size; + else + total = tail->_raw_size; + while ((prev = PREV_SEC (curr)) != NULL + && ((total += curr->output_offset - prev->output_offset) + < stub_group_size)) + curr = prev; + + /* OK, the size from the start of CURR to the end is less + than stub_group_size and thus can be handled by one stub + section. (or the tail section is itself larger than + stub_group_size, in which case we may be toast.) We + should really be keeping track of the total size of stubs + added here, as stubs contribute to the final output + section size. That's a little tricky, and this way will + only break if stubs added make the total size more than + 2^25, ie. for the default stub_group_size, if stubs total + more than 2834432 bytes, or over 100000 plt call stubs. */ + do + { + prev = PREV_SEC (tail); + /* Set up this stub group. */ + htab->stub_group[tail->id].link_sec = curr; + } + while (tail != curr && (tail = prev) != NULL); + + /* But wait, there's more! Input sections up to stub_group_size + bytes before the stub section can be handled by it too. */ + if (!stubs_always_before_branch) + { + total = 0; + while (prev != NULL + && ((total += tail->output_offset - prev->output_offset) + < stub_group_size)) + { + tail = prev; + prev = PREV_SEC (tail); + htab->stub_group[tail->id].link_sec = curr; + } + } + tail = prev; + } + } + while (list-- != htab->input_list); + free (htab->input_list); +#undef PREV_SEC +} + +/* Read in all local syms for all input bfds. */ + +static boolean +get_local_syms (input_bfd, htab) + bfd *input_bfd; + struct ppc_link_hash_table *htab; +{ + unsigned int bfd_indx; + Elf_Internal_Sym *local_syms, **all_local_syms; + + /* We want to read in symbol extension records only once. To do this + we need to read in the local symbols in parallel and save them for + later use; so hold pointers to the local symbols in an array. */ + bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; + all_local_syms = (Elf_Internal_Sym **) bfd_zmalloc (amt); + htab->all_local_syms = all_local_syms; + if (all_local_syms == NULL) + return false; + + /* Walk over all the input BFDs, swapping in local symbols. + If we are creating a shared library, create hash entries for the + export stubs. */ + for (bfd_indx = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next, bfd_indx++) + { + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Shdr *shndx_hdr; + Elf_Internal_Sym *isym; + Elf64_External_Sym *ext_syms, *esym, *end_sy; + Elf_External_Sym_Shndx *shndx_buf, *shndx; + bfd_size_type sec_size; + + /* We'll need the symbol table in a second. */ + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + if (symtab_hdr->sh_info == 0) + continue; + + /* We need an array of the local symbols attached to the input bfd. + Unfortunately, we're going to have to read & swap them in. */ + sec_size = symtab_hdr->sh_info; + sec_size *= sizeof (Elf_Internal_Sym); + local_syms = (Elf_Internal_Sym *) bfd_malloc (sec_size); + if (local_syms == NULL) + return false; + + all_local_syms[bfd_indx] = local_syms; + sec_size = symtab_hdr->sh_info; + sec_size *= sizeof (Elf64_External_Sym); + ext_syms = (Elf64_External_Sym *) bfd_malloc (sec_size); + if (ext_syms == NULL) + return false; + + if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 + || bfd_bread ((PTR) ext_syms, sec_size, input_bfd) != sec_size) + { + error_ret_free_ext_syms: + free (ext_syms); + return false; + } + + shndx_buf = NULL; + shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr; + if (shndx_hdr->sh_size != 0) + { + sec_size = symtab_hdr->sh_info; + sec_size *= sizeof (Elf_External_Sym_Shndx); + shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (sec_size); + if (shndx_buf == NULL) + goto error_ret_free_ext_syms; + + if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0 + || bfd_bread ((PTR) shndx_buf, sec_size, input_bfd) != sec_size) + { + free (shndx_buf); + goto error_ret_free_ext_syms; + } + } + + /* Swap the local symbols in. */ + for (esym = ext_syms, end_sy = esym + symtab_hdr->sh_info, + isym = local_syms, shndx = shndx_buf; + esym < end_sy; + esym++, isym++, shndx = (shndx ? shndx + 1 : NULL)) + bfd_elf64_swap_symbol_in (input_bfd, esym, shndx, isym); + + /* Now we can free the external symbols. */ + free (shndx_buf); + free (ext_syms); + } + + return true; +} + +/* Determine and set the size of the stub section for a final link. + + The basic idea here is to examine all the relocations looking for + PC-relative calls to a target that is unreachable with a "bl" + instruction. */ + +boolean +ppc64_elf_size_stubs (output_bfd, stub_bfd, info, group_size, + add_stub_section, layout_sections_again) + bfd *output_bfd; + bfd *stub_bfd; + struct bfd_link_info *info; + bfd_signed_vma group_size; + asection * (*add_stub_section) PARAMS ((const char *, asection *)); + void (*layout_sections_again) PARAMS ((void)); +{ + bfd_size_type stub_group_size; + boolean stubs_always_before_branch; + boolean ret = false; + struct ppc_link_hash_table *htab = ppc_hash_table (info); + + /* Stash our params away. */ + htab->stub_bfd = stub_bfd; + htab->add_stub_section = add_stub_section; + htab->layout_sections_again = layout_sections_again; + stubs_always_before_branch = group_size < 0; + if (group_size < 0) + stub_group_size = -group_size; + else + stub_group_size = group_size; + if (stub_group_size == 1) + { + /* Default values. */ + stub_group_size = 30720000; + if (htab->has_14bit_branch) + stub_group_size = 30000; + } + + group_sections (htab, stub_group_size, stubs_always_before_branch); + + if (! get_local_syms (info->input_bfds, htab)) + { + if (htab->all_local_syms) + goto error_ret_free_local; + return false; + } + + while (1) + { + bfd *input_bfd; + unsigned int bfd_indx; + asection *stub_sec; + boolean stub_changed; + + htab->stub_iteration += 1; + stub_changed = false; + + for (input_bfd = info->input_bfds, bfd_indx = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next, bfd_indx++) + { + Elf_Internal_Shdr *symtab_hdr; + asection *section; + Elf_Internal_Sym *local_syms; + + /* We'll need the symbol table in a second. */ + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + if (symtab_hdr->sh_info == 0) + continue; + + local_syms = htab->all_local_syms[bfd_indx]; + + /* Walk over each section attached to the input bfd. */ + for (section = input_bfd->sections; + section != NULL; + section = section->next) + { + Elf_Internal_Shdr *input_rel_hdr; + Elf64_External_Rela *external_relocs, *erelaend, *erela; + Elf_Internal_Rela *internal_relocs, *irelaend, *irela; + bfd_size_type amt; + + /* If there aren't any relocs, then there's nothing more + to do. */ + if ((section->flags & SEC_RELOC) == 0 + || section->reloc_count == 0) + continue; + + /* If this section is a link-once section that will be + discarded, then don't create any stubs. */ + if (section->output_section == NULL + || section->output_section->owner != output_bfd) + continue; + + /* Allocate space for the external relocations. */ + amt = section->reloc_count; + amt *= sizeof (Elf64_External_Rela); + external_relocs = (Elf64_External_Rela *) bfd_malloc (amt); + if (external_relocs == NULL) + { + goto error_ret_free_local; + } + + /* Likewise for the internal relocations. */ + amt = section->reloc_count; + amt *= sizeof (Elf_Internal_Rela); + internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt); + if (internal_relocs == NULL) + { + free (external_relocs); + goto error_ret_free_local; + } + + /* Read in the external relocs. */ + input_rel_hdr = &elf_section_data (section)->rel_hdr; + if (bfd_seek (input_bfd, input_rel_hdr->sh_offset, SEEK_SET) != 0 + || bfd_bread ((PTR) external_relocs, + input_rel_hdr->sh_size, + input_bfd) != input_rel_hdr->sh_size) + { + free (external_relocs); + error_ret_free_internal: + free (internal_relocs); + goto error_ret_free_local; + } + + /* Swap in the relocs. */ + erela = external_relocs; + erelaend = erela + section->reloc_count; + irela = internal_relocs; + for (; erela < erelaend; erela++, irela++) + bfd_elf64_swap_reloca_in (input_bfd, erela, irela); + + /* We're done with the external relocs, free them. */ + free (external_relocs); + + /* Now examine each relocation. */ + irela = internal_relocs; + irelaend = irela + section->reloc_count; + for (; irela < irelaend; irela++) + { + unsigned int r_type, r_indx; + enum ppc_stub_type stub_type; + struct ppc_stub_hash_entry *stub_entry; + asection *sym_sec; + bfd_vma sym_value; + bfd_vma destination; + struct ppc_link_hash_entry *hash; + char *stub_name; + const asection *id_sec; + + r_type = ELF64_R_TYPE (irela->r_info); + r_indx = ELF64_R_SYM (irela->r_info); + + if (r_type >= (unsigned int) R_PPC_max) + { + bfd_set_error (bfd_error_bad_value); + goto error_ret_free_internal; + } + + /* Only look for stubs on branch instructions. */ + if (r_type != (unsigned int) R_PPC64_REL24 + && r_type != (unsigned int) R_PPC64_REL14 + && r_type != (unsigned int) R_PPC64_REL14_BRTAKEN + && r_type != (unsigned int) R_PPC64_REL14_BRNTAKEN) + continue; + + /* Now determine the call target, its name, value, + section. */ + sym_sec = NULL; + sym_value = 0; + destination = 0; + hash = NULL; + if (r_indx < symtab_hdr->sh_info) + { + /* It's a local symbol. */ + Elf_Internal_Sym *sym; + Elf_Internal_Shdr *hdr; + + sym = local_syms + r_indx; + hdr = elf_elfsections (input_bfd)[sym->st_shndx]; + sym_sec = hdr->bfd_section; + if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) + sym_value = sym->st_value; + destination = (sym_value + irela->r_addend + + sym_sec->output_offset + + sym_sec->output_section->vma); + } + else + { + /* It's an external symbol. */ + int e_indx; + + e_indx = r_indx - symtab_hdr->sh_info; + hash = ((struct ppc_link_hash_entry *) + elf_sym_hashes (input_bfd)[e_indx]); + + while (hash->elf.root.type == bfd_link_hash_indirect + || hash->elf.root.type == bfd_link_hash_warning) + hash = ((struct ppc_link_hash_entry *) + hash->elf.root.u.i.link); + + if (hash->elf.root.type == bfd_link_hash_defined + || hash->elf.root.type == bfd_link_hash_defweak) + { + sym_sec = hash->elf.root.u.def.section; + sym_value = hash->elf.root.u.def.value; + if (sym_sec->output_section != NULL) + destination = (sym_value + irela->r_addend + + sym_sec->output_offset + + sym_sec->output_section->vma); + } + else if (hash->elf.root.type == bfd_link_hash_undefweak) + ; + else if (hash->elf.root.type == bfd_link_hash_undefined) + ; + else + { + bfd_set_error (bfd_error_bad_value); + goto error_ret_free_internal; + } + } + + /* Determine what (if any) linker stub is needed. */ + stub_type = ppc_type_of_stub (section, irela, &hash, + destination); + if (stub_type == ppc_stub_none) + continue; + + /* Support for grouping stub sections. */ + id_sec = htab->stub_group[section->id].link_sec; + + /* Get the name of this stub. */ + stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela); + if (!stub_name) + goto error_ret_free_internal; + + stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, + stub_name, false, false); + if (stub_entry != NULL) + { + /* The proper stub has already been created. */ + free (stub_name); + continue; + } - /* We use the reloc_count field as a counter if we need - to copy relocs into the output file. */ - s->reloc_count = 0; + stub_entry = ppc_add_stub (stub_name, section, htab); + if (stub_entry == NULL) + { + free (stub_name); + goto error_ret_free_local; + } + + stub_entry->target_value = sym_value; + stub_entry->target_section = sym_sec; + stub_entry->stub_type = stub_type; + stub_entry->h = hash; + stub_changed = true; + } + + /* We're done with the internal relocs, free them. */ + free (internal_relocs); } } - else - { - /* It's not one of our sections, so don't allocate space. */ - continue; - } - if (s->_raw_size == 0) + if (!stub_changed) + break; + + /* OK, we've added some stubs. Find out the new size of the + stub sections. */ + for (stub_sec = htab->stub_bfd->sections; + stub_sec != NULL; + stub_sec = stub_sec->next) { - _bfd_strip_section_from_output (info, s); - continue; + stub_sec->_raw_size = 0; + stub_sec->_cooked_size = 0; } + htab->sbrlt->_raw_size = 0; + htab->sbrlt->_cooked_size = 0; - /* Allocate memory for the section contents. We use bfd_zalloc - here in case unused entries are not reclaimed before the - section's contents are written out. This should not happen, - but this way if it does, we get a R_PPC64_NONE reloc instead - of garbage. */ - s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); - if (s->contents == NULL) - return false; + bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, htab); + + /* Ask the linker to do its stuff. */ + (*htab->layout_sections_again) (); } - if (elf_hash_table (info)->dynamic_sections_created) - { - /* Add some entries to the .dynamic section. We fill in the - values later, in ppc64_elf_finish_dynamic_sections, but we - must add the entries now so that we get the correct size for - the .dynamic section. The DT_DEBUG entry is filled in by the - dynamic linker and used by the debugger. */ -#define add_dynamic_entry(TAG, VAL) \ - bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) + /* It would be nice to strip .branch_lt from the output if the + section is empty, but it's too late. If we strip sections here, + the dynamic symbol table is corrupted since the section symbol + for the stripped section isn't written. */ - if (!info->shared) - { - if (!add_dynamic_entry (DT_DEBUG, 0)) - return false; - } + ret = true; - if (htab->splt->_raw_size != 0) - { - if (!add_dynamic_entry (DT_PLTGOT, 0) - || !add_dynamic_entry (DT_PLTRELSZ, 0) - || !add_dynamic_entry (DT_PLTREL, DT_RELA) - || !add_dynamic_entry (DT_JMPREL, 0)) - return false; - } + error_ret_free_local: + while (htab->bfd_count-- > 0) + if (htab->all_local_syms[htab->bfd_count]) + free (htab->all_local_syms[htab->bfd_count]); + free (htab->all_local_syms); - if (relocs) - { - if (!add_dynamic_entry (DT_RELA, 0) - || !add_dynamic_entry (DT_RELASZ, 0) - || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) - return false; + return ret; +} - /* If any dynamic relocs apply to a read-only section, - then we need a DT_TEXTREL entry. */ - elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, (PTR) info); +/* Called after we have determined section placement. If sections + move, we'll be called again. Provide a value for TOCstart. */ - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - return false; - } - } +bfd_vma +ppc64_elf_toc (obfd) + bfd *obfd; +{ + asection *s; + bfd_vma TOCstart; + + /* The TOC consists of sections .got, .toc, .tocbss, .plt in that + order. The TOC starts where the first of these sections starts. */ + s = bfd_get_section_by_name (obfd, ".got"); + if (s == NULL) + s = bfd_get_section_by_name (obfd, ".toc"); + if (s == NULL) + s = bfd_get_section_by_name (obfd, ".tocbss"); + if (s == NULL) + s = bfd_get_section_by_name (obfd, ".plt"); + if (s == NULL) + { + /* This may happen for + o references to TOC base (SYM@toc / TOC[tc0]) without a + .toc directive + o bad linker script + o --gc-sections and empty TOC sections + + FIXME: Warn user? */ + + /* Look for a likely section. We probably won't even be + using TOCstart. */ + for (s = obfd->sections; s != NULL; s = s->next) + if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY)) + == (SEC_ALLOC | SEC_SMALL_DATA)) + break; + if (s == NULL) + for (s = obfd->sections; s != NULL; s = s->next) + if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA)) + == (SEC_ALLOC | SEC_SMALL_DATA)) + break; + if (s == NULL) + for (s = obfd->sections; s != NULL; s = s->next) + if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC) + break; + if (s == NULL) + for (s = obfd->sections; s != NULL; s = s->next) + if ((s->flags & SEC_ALLOC) == SEC_ALLOC) + break; } -#undef add_dynamic_entry - return true; -} + TOCstart = 0; + if (s != NULL) + TOCstart = s->output_section->vma + s->output_offset; -/* Called after we have seen all the input files/sections, but before - final symbol resolution and section placement has been determined. + return TOCstart; +} - We use this hook to provide a value for TOCstart, which we store in - the output bfd elf_gp, then we call the generic ELF final link - routine. */ +/* Build all the stubs associated with the current output file. + The stubs are kept in a hash table attached to the main linker + hash table. This function is called via gldelf64ppc_finish. */ -static boolean -ppc64_elf_final_link (abfd, info) - bfd *abfd; +boolean +ppc64_elf_build_stubs (info) struct bfd_link_info *info; { - if (! info->relocateable) + struct ppc_link_hash_table *htab = ppc_hash_table (info); + asection *stub_sec; + bfd_vma plt_r2; + bfd_byte *p; + + for (stub_sec = htab->stub_bfd->sections; + stub_sec != NULL; + stub_sec = stub_sec->next) { - asection *s; - bfd_vma TOCstart; + bfd_size_type size; - /* The TOC consists of sections .got, .toc, .tocbss, .plt in this - order. The TOC starts where the first of these sections starts. */ - s = bfd_get_section_by_name (abfd, ".got"); - if (s == NULL) - s = bfd_get_section_by_name (abfd, ".toc"); - if (s == NULL) - s = bfd_get_section_by_name (abfd, ".tocbss"); - if (s == NULL) - s = bfd_get_section_by_name (abfd, ".plt"); - if (s == NULL) + /* Allocate memory to hold the linker stubs. */ + size = stub_sec->_raw_size; + if (size != 0) { - /* This may happen for - o references to TOC base (SYM@toc / TOC[tc0]) without a - .toc directive - o bad linker script - o --gc-sections and empty TOC sections - - FIXME: Warn user? */ + stub_sec->contents = (bfd_byte *) bfd_zalloc (htab->stub_bfd, size); + if (stub_sec->contents == NULL) + return false; + } + stub_sec->_cooked_size = 0; + } - /* Look for a likely section. We probably won't even be - using TOCstart. */ - for (s = abfd->sections; s != NULL; s = s->next) - if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY)) - == (SEC_ALLOC | SEC_SMALL_DATA)) - break; - if (s == NULL) - for (s = abfd->sections; s != NULL; s = s->next) - if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA)) - == (SEC_ALLOC | SEC_SMALL_DATA)) - break; - if (s == NULL) - for (s = abfd->sections; s != NULL; s = s->next) - if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC) - break; - if (s == NULL) - for (s = abfd->sections; s != NULL; s = s->next) - if ((s->flags & SEC_ALLOC) == SEC_ALLOC) - break; + if (htab->splt != NULL) + { + /* Build the .glink plt call stub. */ + plt_r2 = (htab->splt->output_offset + + htab->splt->output_section->vma + - elf_gp (htab->splt->output_section->owner) + - TOC_BASE_OFF); + p = htab->sglink->contents; + p = build_plt_stub (htab->sglink->owner, p, (int) plt_r2, 1); + while (p - htab->sglink->contents < GLINK_CALL_STUB_SIZE) + { + bfd_put_32 (htab->sglink->owner, NOP, p); + p += 4; } + htab->sglink->_cooked_size = p - htab->sglink->contents; + + /* Use reloc_count to count entries. */ + htab->sglink->reloc_count = 0; + } + + if (htab->sbrlt->_raw_size != 0) + { + htab->sbrlt->contents = (bfd_byte *) bfd_zalloc (htab->sbrlt->owner, + htab->sbrlt->_raw_size); + if (htab->sbrlt->contents == NULL) + return false; + } - TOCstart = 0; - if (s != NULL) - TOCstart = s->output_section->vma + s->output_offset; + /* Build the stubs as directed by the stub hash table. */ + bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info); + htab->sglink->reloc_count = 0; - elf_gp (abfd) = TOCstart; + for (stub_sec = htab->stub_bfd->sections; + stub_sec != NULL; + stub_sec = stub_sec->next) + { + if (stub_sec->_raw_size != stub_sec->_cooked_size) + break; + } + + if (stub_sec != NULL + || htab->sglink->_raw_size != htab->sglink->_cooked_size) + { + htab->stub_error = true; + (*_bfd_error_handler) (_("stubs don't match calculated size")); } - /* Invoke the regular ELF backend linker to do all the work. */ - return bfd_elf64_bfd_final_link (abfd, info); + return !htab->stub_error; } /* Set up any other section flags and such that may be necessary. */ @@ -3068,6 +5109,12 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, bfd_vma *local_got_offsets; bfd_vma TOCstart; boolean ret = true; + boolean is_opd; + /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ + boolean is_power4 = false; + + if (info->relocateable) + return true; /* Initialize howto table if needed. */ if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) @@ -3078,6 +5125,7 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, TOCstart = elf_gp (output_bfd); symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); + is_opd = strcmp (bfd_get_section_name (abfd, input_section), ".opd") == 0; rel = relocs; relend = relocs + input_section->reloc_count; @@ -3090,35 +5138,19 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, Elf_Internal_Sym *sym; asection *sec; struct elf_link_hash_entry *h; + struct elf_link_hash_entry *fdh; const char *sym_name; unsigned long r_symndx; bfd_vma relocation; boolean unresolved_reloc; + boolean warned; long insn; + struct ppc_stub_hash_entry *stub_entry; + bfd_vma max_br_offset; + bfd_vma from; r_type = (enum elf_ppc_reloc_type) ELF64_R_TYPE (rel->r_info); r_symndx = ELF64_R_SYM (rel->r_info); - - if (info->relocateable) - { - /* This is a relocatable 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 ((unsigned) 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. */ - offset = rel->r_offset; addend = rel->r_addend; r = bfd_reloc_other; @@ -3127,6 +5159,7 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, h = (struct elf_link_hash_entry *) 0; sym_name = (const char *) 0; unresolved_reloc = false; + warned = false; if (r_type == R_PPC64_TOC) { @@ -3140,9 +5173,9 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, sec = local_sections[r_symndx]; sym_name = ""; - relocation = (sec->output_section->vma - + sec->output_offset - + sym->st_value); + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); + /* rel may have changed, update our copy of addend. */ + addend = rel->r_addend; } else { @@ -3183,7 +5216,7 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, || info->no_undefined || ELF_ST_VISIBILITY (h->other))))) return false; - relocation = 0; + warned = true; } } @@ -3197,53 +5230,107 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, /* Branch taken prediction relocations. */ case R_PPC64_ADDR14_BRTAKEN: case R_PPC64_REL14_BRTAKEN: - insn = 0x01 << 21; /* Set 't' bit, lowest bit of BO field. */ - /* Fall thru. */ + insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ + /* Fall thru. */ /* Branch not taken prediction relocations. */ case R_PPC64_ADDR14_BRNTAKEN: case R_PPC64_REL14_BRNTAKEN: insn |= bfd_get_32 (output_bfd, contents + offset) & ~(0x01 << 21); - /* Set 'a' bit. This is 0b00010 in BO field for branch on CR(BI) - insns (BO == 001at or 011at), and 0b01000 for branch on CTR - insns (BO == 1a00t or 1a01t). */ - if ((insn & (0x14 << 21)) == (0x04 << 21)) - insn |= 0x02 << 21; - else if ((insn & (0x14 << 21)) == (0x10 << 21)) - insn |= 0x08 << 21; + if (is_power4) + { + /* Set 'a' bit. This is 0b00010 in BO field for branch + on CR(BI) insns (BO == 001at or 011at), and 0b01000 + for branch on CTR insns (BO == 1a00t or 1a01t). */ + if ((insn & (0x14 << 21)) == (0x04 << 21)) + insn |= 0x02 << 21; + else if ((insn & (0x14 << 21)) == (0x10 << 21)) + insn |= 0x08 << 21; + else + break; + } else - break; + { + from = (offset + + input_section->output_offset + + input_section->output_section->vma); + + /* Invert 'y' bit if not the default. */ + if ((bfd_signed_vma) (relocation + addend - from) < 0) + insn ^= 0x01 << 21; + } bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset); break; case R_PPC64_REL24: - case R_PPC64_ADDR24: - /* An ADDR24 or REL24 branching to a linkage function may be - followed by a nop that we have to replace with a ld in - order to restore the TOC base pointer. Only calls to - shared objects need to alter the TOC base. These are - recognized by their need for a PLT entry. */ + /* A REL24 branching to a linkage function is followed by a + nop. We replace the nop with a ld in order to restore + the TOC base pointer. Only calls to shared objects need + to alter the TOC base. These are recognized by their + need for a PLT entry. */ if (h != NULL - && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0 - /* Make sure that there really is an instruction after - the branch that we can decode. */ - && offset + 8 <= input_section->_cooked_size) + && (fdh = ((struct ppc_link_hash_entry *) h)->oh) != NULL + && fdh->plt.offset != (bfd_vma) -1 + && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh, + rel, htab)) != NULL) { - bfd_byte *pnext; + boolean can_plt_call = 0; + + if (offset + 8 <= input_section->_cooked_size) + { + insn = bfd_get_32 (input_bfd, contents + offset + 4); + if (insn == NOP + || insn == CROR_151515 || insn == CROR_313131) + { + bfd_put_32 (input_bfd, (bfd_vma) LD_R2_40R1, + contents + offset + 4); + can_plt_call = 1; + } + } - pnext = contents + offset + 4; - insn = bfd_get_32 (input_bfd, pnext); + if (!can_plt_call) + { + /* If this is a plain branch rather than a branch + and link, don't require a nop. */ + insn = bfd_get_32 (input_bfd, contents + offset); + if ((insn & 1) == 0) + can_plt_call = 1; + } - if (insn == 0x60000000 /* nop (ori r0,r0,0) */ - || insn == 0x4def7b82 /* cror 15,15,15 */ - || insn == 0x4ffffb82) /* cror 31,31,31 */ + if (can_plt_call) { - bfd_put_32 (input_bfd, - (bfd_vma) 0xe8410028, /* ld r2,40(r1) */ - pnext); + relocation = (stub_entry->stub_offset + + stub_entry->stub_sec->output_offset + + stub_entry->stub_sec->output_section->vma); + addend = 0; + unresolved_reloc = false; } } + + if (h != NULL + && h->root.type == bfd_link_hash_undefweak + && relocation == 0 + && addend == 0) + { + /* Tweak calls to undefined weak functions to point at a + blr. We can thus call a weak function without first + checking whether the function is defined. We have a + blr at the end of .sfpr. */ + BFD_ASSERT (htab->sfpr->_raw_size != 0); + relocation = (htab->sfpr->_raw_size - 4 + + htab->sfpr->output_offset + + htab->sfpr->output_section->vma); + from = (offset + + input_section->output_offset + + input_section->output_section->vma); + + /* But let's not be silly about it. If the blr isn't in + reach, just go to the next instruction. */ + if (relocation - from + (1 << 25) >= (1 << 26) + || htab->sfpr->_raw_size == 0) + relocation = from + 4; + } break; } @@ -3401,21 +5488,12 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, which is the address of the start of the TOC plus 0x8000. The TOC consists of sections .got, .toc, .tocbss, and .plt, in this order. */ - case R_PPC64_TOC16: case R_PPC64_TOC16_LO: case R_PPC64_TOC16_HI: case R_PPC64_TOC16_DS: case R_PPC64_TOC16_LO_DS: case R_PPC64_TOC16_HA: - /* Only .got, .toc and *UND* symbols are allowed. */ - BFD_ASSERT (sec != (asection *) 0 - && (bfd_is_und_section (sec) - || strcmp (bfd_get_section_name (abfd, sec), - ".toc") == 0 - || strcmp (bfd_get_section_name (abfd, sec), - ".got") == 0)); - addend -= TOCstart + TOC_BASE_OFF; break; @@ -3430,12 +5508,14 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, addend -= sec->output_section->vma; break; - /* Relocations that may need to be propagated if this is a - dynamic object. */ case R_PPC64_REL14: case R_PPC64_REL14_BRNTAKEN: case R_PPC64_REL14_BRTAKEN: case R_PPC64_REL24: + break; + + /* Relocations that may need to be propagated if this is a + dynamic object. */ case R_PPC64_REL32: case R_PPC64_REL64: case R_PPC64_ADDR14: @@ -3458,12 +5538,18 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, case R_PPC64_UADDR16: case R_PPC64_UADDR32: case R_PPC64_UADDR64: - case R_PPC64_TOC: /* r_symndx will be zero only for relocs against symbols from removed linkonce sections, or sections discarded by a linker script. */ - if (r_symndx == 0 - || (input_section->flags & SEC_ALLOC) == 0) + if (r_symndx == 0) + break; + /* Fall thru. */ + + case R_PPC64_TOC: + if ((input_section->flags & SEC_ALLOC) == 0) + break; + + if (NO_OPD_RELOCS && is_opd) break; if ((info->shared @@ -3494,56 +5580,56 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, time. */ skip = false; - - if (elf_section_data (input_section)->stab_info == NULL) - outrel.r_offset = offset; - else - { - bfd_vma off; - - off = (_bfd_stab_section_offset - (output_bfd, htab->elf.stab_info, input_section, - &elf_section_data (input_section)->stab_info, - offset)); - if (off == (bfd_vma) -1) - skip = true; - outrel.r_offset = off; - } - + relocate = false; + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset); + if (outrel.r_offset == (bfd_vma) -1) + skip = true; + else if (outrel.r_offset == (bfd_vma) -2) + skip = true, relocate = true; outrel.r_offset += (input_section->output_section->vma + input_section->output_offset); outrel.r_addend = addend; if (skip) - { - relocate = false; - memset (&outrel, 0, sizeof outrel); - } + memset (&outrel, 0, sizeof outrel); else if (h != NULL && h->dynindx != -1 + && !is_opd && (!IS_ABSOLUTE_RELOC (r_type) || !info->shared || !info->symbolic || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)) - { - relocate = false; - outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); - } + outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); else { - /* This symbol is local, or marked to become local. */ + /* This symbol is local, or marked to become local, + or this is an opd section reloc which must point + at a local function. */ outrel.r_addend += relocation; relocate = true; - if (r_type == R_PPC64_ADDR64) + if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC) { + if (is_opd && h != NULL && info->shared) + { + /* Lie about opd entries. This case occurs + when building shared libraries and we + reference a function in another shared + lib. In that case we won't use the opd + entry in this lib; We ought to edit the + opd section to remove unused entries. */ + unresolved_reloc = false; + } outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); } else { long indx = 0; - if (r_type == R_PPC64_TOC || bfd_is_abs_section (sec)) + if (bfd_is_abs_section (sec)) ; else if (sec == NULL || sec->owner == NULL) { @@ -3656,6 +5742,34 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, continue; } break; + + case R_PPC64_REL14: + case R_PPC64_REL14_BRNTAKEN: + case R_PPC64_REL14_BRTAKEN: + max_br_offset = 1 << 15; + goto branch_check; + + case R_PPC64_REL24: + max_br_offset = 1 << 25; + + branch_check: + /* If the branch is out of reach, then redirect the + call to the local stub for this function. */ + from = (offset + + input_section->output_offset + + input_section->output_section->vma); + if (relocation + addend - from + max_br_offset >= 2 * max_br_offset + && (stub_entry = ppc_get_stub_entry (input_section, sec, h, + rel, htab)) != NULL) + { + /* Munge up the value and addend so that we call the stub + rather than the procedure directly. */ + relocation = (stub_entry->stub_offset + + stub_entry->stub_sec->output_offset + + stub_entry->stub_sec->output_section->vma); + addend = 0; + } + break; } /* FIXME: Why do we allow debugging sections to escape this error? @@ -3666,12 +5780,15 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, && !(info->shared && (input_section->flags & SEC_DEBUGGING) != 0 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) - (*_bfd_error_handler) - (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), - bfd_archive_filename (input_bfd), - bfd_get_section_name (input_bfd, input_section), - (long) rel->r_offset, - h->root.root.string); + { + (*_bfd_error_handler) + (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, + h->root.root.string); + ret = false; + } r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type], input_bfd, @@ -3681,9 +5798,7 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, relocation, addend); - if (r == bfd_reloc_ok) - ; - else if (r == bfd_reloc_overflow) + if (r != bfd_reloc_ok) { const char *name; @@ -3714,13 +5829,25 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section, name = bfd_section_name (input_bfd, sec); } - if (! ((*info->callbacks->reloc_overflow) - (info, name, ppc64_elf_howto_table[(int) r_type]->name, - (bfd_vma) 0, input_bfd, input_section, offset))) - return false; + if (r == bfd_reloc_overflow) + { + if (warned) + continue; + if (!((*info->callbacks->reloc_overflow) + (info, name, ppc64_elf_howto_table[(int) r_type]->name, + rel->r_addend, input_bfd, input_section, offset))) + return false; + } + else + { + (*_bfd_error_handler) + (_("%s(%s+0x%lx): reloc against `%s': error %d"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, name, (int) r); + ret = false; + } } - else - ret = false; } return ret; @@ -3742,31 +5869,18 @@ ppc64_elf_finish_dynamic_symbol (output_bfd, info, h, sym) htab = ppc_hash_table (info); dynobj = htab->elf.dynobj; - if (h->plt.offset != (bfd_vma) -1) + if (h->plt.offset != (bfd_vma) -1 + && ((struct ppc_link_hash_entry *) h)->is_func_descriptor) { - struct elf_link_hash_entry *funcdesc_h; Elf_Internal_Rela rela; Elf64_External_Rela *loc; /* This symbol has an entry in the procedure linkage table. Set it up. */ - if (h->dynindx == -1 - || htab->splt == NULL + if (htab->splt == NULL || htab->srelplt == NULL - || htab->sglink == NULL - || h->root.root.string[0] != '.' - || h->root.root.string[1] == '\0') - abort (); - - /* Find its corresponding function descriptor. - ppc64_elf_adjust_dynamic_symbol has already set it up for us. */ - - funcdesc_h = elf_link_hash_lookup (elf_hash_table (info), - h->root.root.string + 1, - false, false, false); - - if (funcdesc_h == NULL || funcdesc_h->dynindx == -1) + || htab->sglink == NULL) abort (); /* Create a JMP_SLOT reloc to inform the dynamic linker to @@ -3775,48 +5889,12 @@ ppc64_elf_finish_dynamic_symbol (output_bfd, info, h, sym) rela.r_offset = (htab->splt->output_section->vma + htab->splt->output_offset + h->plt.offset); - rela.r_info = ELF64_R_INFO (funcdesc_h->dynindx, R_PPC64_JMP_SLOT); + rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT); rela.r_addend = 0; loc = (Elf64_External_Rela *) htab->srelplt->contents; loc += (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE; bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); - - /* We need to create a linkage function. */ - if (h->root.u.def.section == htab->sglink) - { - bfd_byte *p; - bfd_vma pltoff; - const unsigned int *stub; - - /* Where to write it. */ - p = h->root.u.def.section->contents + h->root.u.def.value; - - /* The function descriptor is in the PLT. */ - pltoff = htab->splt->output_section->vma - + htab->splt->output_section->output_offset - + h->plt.offset - - elf_gp (output_bfd) - TOC_BASE_OFF; - - if (pltoff + 0x8000 > 0xffff) - { - (*_bfd_error_handler) - (_("linkage table overflow against `%s'"), - h->root.root.string); - } - - /* Write it out. */ - stub = ppc64_elf_glink_code; - bfd_put_32 (output_bfd, *stub | (pltoff & 0xfffc), p); - while (p += 4, ++stub < (ppc64_elf_glink_code - + (sizeof (ppc64_elf_glink_code) - / sizeof (*ppc64_elf_glink_code)))); - { - bfd_put_32 (output_bfd, (bfd_vma) *stub, p); - } - } - else - abort (); } if (h->got.offset != (bfd_vma) -1) @@ -3945,6 +6023,7 @@ ppc64_elf_finish_dynamic_sections (output_bfd, info) for (; dyncon < dynconend; dyncon++) { Elf_Internal_Dyn dyn; + asection *s; bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); @@ -3953,19 +6032,42 @@ ppc64_elf_finish_dynamic_sections (output_bfd, info) default: continue; + case DT_PPC64_GLINK: + dyn.d_un.d_ptr = (htab->sglink->output_section->vma + + htab->sglink->output_offset); + break; + + case DT_PPC64_OPD: + s = bfd_get_section_by_name (output_bfd, ".opd"); + if (s != NULL) + dyn.d_un.d_ptr = s->vma; + break; + + case DT_PPC64_OPDSZ: + s = bfd_get_section_by_name (output_bfd, ".opd"); + if (s != NULL) + dyn.d_un.d_val = s->_raw_size; + break; + case DT_PLTGOT: - dyn.d_un.d_ptr = htab->splt->output_section->vma; + dyn.d_un.d_ptr = (htab->splt->output_section->vma + + htab->splt->output_offset); break; case DT_JMPREL: - dyn.d_un.d_ptr = htab->srelplt->output_section->vma; + dyn.d_un.d_ptr = (htab->srelplt->output_section->vma + + htab->srelplt->output_offset); break; case DT_PLTRELSZ: - if (htab->srelplt->output_section->_cooked_size != 0) - dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size; - else - dyn.d_un.d_val = htab->srelplt->output_section->_raw_size; + dyn.d_un.d_val = htab->srelplt->_raw_size; + break; + + case DT_RELASZ: + /* Don't count procedure linkage table relocs in the + overall reloc count. */ + if (htab->srelplt != NULL) + dyn.d_un.d_val -= htab->srelplt->_raw_size; break; } @@ -3973,6 +6075,25 @@ ppc64_elf_finish_dynamic_sections (output_bfd, info) } } + if (htab->sgot != NULL && htab->sgot->_raw_size != 0) + { + /* Fill in the first entry in the global offset table. + We use it to hold the link-time TOCbase. */ + bfd_put_64 (output_bfd, + elf_gp (output_bfd) + TOC_BASE_OFF, + htab->sgot->contents); + + /* Set .got entry size. */ + elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 8; + } + + if (htab->splt != NULL && htab->splt->_raw_size != 0) + { + /* Set .plt entry size. */ + elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize + = PLT_ENTRY_SIZE; + } + return true; } @@ -3998,18 +6119,18 @@ ppc64_elf_finish_dynamic_sections (output_bfd, info) #define elf_backend_plt_alignment 3 #define elf_backend_plt_not_loaded 1 #define elf_backend_got_symbol_offset 0 -#define elf_backend_got_header_size 0 +#define elf_backend_got_header_size 8 +#define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE #define elf_backend_can_gc_sections 1 #define elf_backend_can_refcount 1 - -#define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE +#define elf_backend_rela_normal 1 #define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup #define bfd_elf64_bfd_set_private_flags ppc64_elf_set_private_flags -#define bfd_elf64_bfd_copy_private_bfd_data ppc64_elf_copy_private_bfd_data #define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data #define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create -#define bfd_elf64_bfd_final_link ppc64_elf_final_link +#define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free +#define bfd_elf64_get_symbol_info ppc64_elf_get_symbol_info #define elf_backend_section_from_shdr ppc64_elf_section_from_shdr #define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections @@ -4018,6 +6139,8 @@ ppc64_elf_finish_dynamic_sections (output_bfd, info) #define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook #define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook #define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol +#define elf_backend_hide_symbol ppc64_elf_hide_symbol +#define elf_backend_always_size_sections ppc64_elf_func_desc_adjust #define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections #define elf_backend_fake_sections ppc64_elf_fake_sections #define elf_backend_relocate_section ppc64_elf_relocate_section