| /* Script for ld --shared: link shared library */ |
| OUTPUT_FORMAT("elf32-nacl", "elf32-nacl", |
| "elf32-nacl") |
| OUTPUT_ARCH(i386) |
| ENTRY(_start) |
| SEARCH_DIR("=/usr/local/lib32"); SEARCH_DIR("=/lib32"); SEARCH_DIR("=/usr/lib32"); |
| SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); SEARCH_DIR("=/usr/lib"); |
| PHDRS |
| { |
| seg_code PT_LOAD FLAGS(5) ; /* read + execute */ |
| seg_rodata PT_LOAD FLAGS(4) ; /* read */ |
| seg_rwdata PT_LOAD FLAGS(6) ; /* read + write */ |
| |
| seg_dynamic PT_DYNAMIC FLAGS(6) ; |
| seg_stack PT_GNU_STACK FLAGS(6) ; |
| seg_tls PT_TLS FLAGS(4) ; |
| seg_note PT_NOTE FLAGS(4) ; |
| } |
| SECTIONS |
| { |
| . = SEGMENT_START("text", 0); |
| _begin = .; |
| |
| /* The ALIGN(32) instructions below are workarounds. |
| TODO(mseaborn): Get the object files to include the correct |
| alignments and padding themselves. |
| See http://code.google.com/p/nativeclient/issues/detail?id=499. */ |
| .init : SUBALIGN(32) |
| { |
| KEEP (*(.init)) |
| . = ALIGN(32); /* ensure nop padding */ |
| } :seg_code =0x90909090 |
| .plt : { *(.plt) } |
| .text : SUBALIGN(32) |
| { |
| *(.text .stub .text.* .gnu.linkonce.t.*) |
| KEEP (*(.text.*personality*)) |
| /* .gnu.warning sections are handled specially by elf32.em. */ |
| *(.gnu.warning) |
| /* Putting .fini here makes the align pad correctly when .fini is empty. |
| Listing the __libc* sections is also necessary to make padding work. */ |
| KEEP (*(.fini)) |
| *(__libc_freeres_fn) |
| *(__libc_thread_freeres_fn) |
| . = ALIGN(CONSTANT (MAXPAGESIZE)); /* ensures NOP fill */ |
| } =0x90909090 |
| PROVIDE (__etext = .); |
| PROVIDE (_etext = .); |
| PROVIDE (etext = .); |
| |
| . = ALIGN(SEGMENT_START("text", 0) + 0x10000000, CONSTANT (MAXPAGESIZE)); |
| .note.gnu.build-id : |
| { |
| PROVIDE_HIDDEN (__note_gnu_build_id_start = .); |
| *(.note.gnu.build-id) |
| PROVIDE_HIDDEN (__note_gnu_build_id_end = .); |
| } :seg_rodata :seg_note |
| /* :seg_rodata is on .dummy rather than on .hash to avoid breaking the linker |
| script munging that glibc's Makerules does using sed. */ |
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| .rela.fini : { *(.rela.fini) } |
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| .rel.dtors : { *(.rel.dtors) } |
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| .rela.plt : { *(.rela.plt) } |
| .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } |
| .rodata1 : { *(.rodata1) } |
| .eh_frame_hdr : { *(.eh_frame_hdr) } |
| .eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) } |
| .gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) } |
| /* Adjust the address for the data segment. We want to adjust up to |
| the same address within the page on the next page up. */ |
| . = ALIGN (CONSTANT (MAXPAGESIZE)) - ((CONSTANT (MAXPAGESIZE) - .) & (CONSTANT (MAXPAGESIZE) - 1)); . = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE)); |
| /* Executables loaded by sel_ldr are not required to have seg_rwdata aligned |
| to page boundary. So we can omit alignment here both for ld.so and normal |
| libraries. */ |
| /* Exception handling */ |
| .eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) } :seg_rwdata |
| .gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) } |
| /* Thread Local Storage sections */ |
| .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) } :seg_rwdata :seg_tls |
| .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) } |
| . = 0x10030000; .nacl_irt_syscall_ptr : { KEEP(*(.nacl_irt_syscall_ptr)) } |
| . = 0x10030004; .preinit_array : |
| { |
| KEEP (*(.preinit_array)) |
| } :seg_rwdata |
| .init_array : |
| { |
| KEEP (*(SORT(.init_array.*))) |
| KEEP (*(.init_array)) |
| } |
| .fini_array : |
| { |
| KEEP (*(.fini_array)) |
| KEEP (*(SORT(.fini_array.*))) |
| } |
| .ctors : |
| { |
| /* gcc uses crtbegin.o to find the start of |
| the constructors, so we make sure it is |
| first. Because this is a wildcard, it |
| doesn't matter if the user does not |
| actually link against crtbegin.o; the |
| linker won't look for a file to match a |
| wildcard. The wildcard also means that it |
| doesn't matter which directory crtbegin.o |
| is in. */ |
| KEEP (*crtbegin.o(.ctors)) |
| KEEP (*crtbegin?.o(.ctors)) |
| /* We don't want to include the .ctor section from |
| the crtend.o file until after the sorted ctors. |
| The .ctor section from the crtend file contains the |
| end of ctors marker and it must be last */ |
| KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors)) |
| KEEP (*(SORT(.ctors.*))) |
| KEEP (*(.ctors)) |
| } |
| .dtors : |
| { |
| KEEP (*crtbegin.o(.dtors)) |
| KEEP (*crtbegin?.o(.dtors)) |
| KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors)) |
| KEEP (*(SORT(.dtors.*))) |
| KEEP (*(.dtors)) |
| } |
| .jcr : { KEEP (*(.jcr)) } |
| .data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro* .gnu.linkonce.d.rel.ro.*) } |
| .dynamic : { *(.dynamic) } :seg_dynamic :seg_rwdata |
| .got : { *(.got) } :seg_rwdata |
| /* This command ensures that the first 3 entries of .got.plt are separated |
| by page boundary from the rest of .got.plt and marks the end of RELRO |
| segment. This segment is part of read-write segment that is made read-only |
| after loading the library. The first 3 entries of .got.plt are special. |
| They are filled by the linker and are not changed after loading. The rest |
| of .got.plt is filled lazily and so must stay writable. That's why |
| the first 3 .got.plt entries mark the end of RELRO segment. */ |
| . = DATA_SEGMENT_RELRO_END (12, .); |
| .got.plt : { *(.got.plt) } |
| .data : |
| { |
| *(.data .data.* .gnu.linkonce.d.*) |
| KEEP (*(.gnu.linkonce.d.*personality*)) |
| SORT(CONSTRUCTORS) |
| } |
| .data1 : { *(.data1) } |
| _edata = .; PROVIDE (edata = .); |
| |
| /* We place the BSS in a separate segment as a workaround for the |
| behaviour of NaCl's mmap() on the last page in a file. When using |
| copy-on-write MAP_PRIVATE, we cannot necessarily write beyond the |
| file's extent within the 64k page. |
| See http://code.google.com/p/nativeclient/issues/detail?id=824. |
| TODO(mseaborn): A better fix would be to change the dynamic linker |
| to copy the last page. This would save a page of memory because |
| the BSS could share a page with the data segment. But for now, it |
| is simpler to change the linker script. */ |
| |
| |
| |
| __bss_start = .; |
| .bss : |
| { |
| *(.dynbss) |
| *(.bss .bss.* .gnu.linkonce.b.*) |
| *(COMMON) |
| /* Align here to ensure that the .bss section occupies space up to |
| _end. Align after .bss to ensure correct alignment even if the |
| .bss section disappears because there are no input sections. |
| FIXME: Why do we need it? When there is no .bss section, we don't |
| pad the .data section. */ |
| . = ALIGN(. != 0 ? 32 / 8 : 1); |
| } |
| . = ALIGN(32 / 8); |
| . = ALIGN(32 / 8); |
| _end = .; PROVIDE (end = .); . = DATA_SEGMENT_END(.); |
| /* Stabs debugging sections. */ |
| .stab 0 : { *(.stab) } |
| .stabstr 0 : { *(.stabstr) } |
| .stab.excl 0 : { *(.stab.excl) } |
| .stab.exclstr 0 : { *(.stab.exclstr) } |
| .stab.index 0 : { *(.stab.index) } |
| .stab.indexstr 0 : { *(.stab.indexstr) } |
| .comment 0 : { *(.comment) } |
| /* DWARF debug sections. |
| Symbols in the DWARF debugging sections are relative to the beginning |
| of the section so we begin them at 0. */ |
| /* DWARF 1 */ |
| .debug 0 : { *(.debug) } |
| .line 0 : { *(.line) } |
| /* GNU DWARF 1 extensions */ |
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| .debug_sfnames 0 : { *(.debug_sfnames) } |
| /* DWARF 1.1 and DWARF 2 */ |
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| .debug_pubnames 0 : { *(.debug_pubnames) } |
| /* DWARF 2 */ |
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| .debug_line 0 : { *(.debug_line) } |
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| .debug_loc 0 : { *(.debug_loc) } |
| .debug_macinfo 0 : { *(.debug_macinfo) } |
| /* SGI/MIPS DWARF 2 extensions */ |
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| .debug_funcnames 0 : { *(.debug_funcnames) } |
| .debug_typenames 0 : { *(.debug_typenames) } |
| .debug_varnames 0 : { *(.debug_varnames) } |
| /* DWARF 3 */ |
| .debug_pubtypes 0 : { *(.debug_pubtypes) } |
| .debug_ranges 0 : { *(.debug_ranges) } |
| .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) } |
| /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) } |
| /DISCARD/ : { *(.note.ABI-tag) } |
| } |
| |
