1 # Copyright (C) 2014 Free Software Foundation, Inc. 2 # 3 # Copying and distribution of this file, with or without modification, 4 # are permitted in any medium without royalty provided the copyright 5 # notice and this notice are preserved. 6 # 7 # Unusual variables checked by this code: 8 # NOP - two byte opcode for no-op (defaults to 0) 9 # INITIAL_READONLY_SECTIONS - at start of text segment 10 # OTHER_READONLY_SECTIONS - other than .text .init .rodata ... 11 # (e.g., .PARISC.milli) 12 # OTHER_TEXT_SECTIONS - these get put in .text when relocating 13 # OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... 14 # (e.g., .PARISC.global) 15 # OTHER_SECTIONS - at the end 16 # EXECUTABLE_SYMBOLS - symbols that must be defined for an 17 # executable (e.g., _DYNAMIC_LINK) 18 # TEXT_START_SYMBOLS - symbols that appear at the start of the 19 # .text section. 20 # DATA_START_SYMBOLS - symbols that appear at the start of the 21 # .data section. 22 # OTHER_GOT_SYMBOLS - symbols defined just before .got. 23 # OTHER_GOT_SECTIONS - sections just after .got and .sdata. 24 # OTHER_BSS_SYMBOLS - symbols that appear at the start of the 25 # .bss section besides __bss_start. 26 # INPUT_FILES - INPUT command of files to always include 27 # INIT_START, INIT_END - statements just before and just after 28 # combination of .init sections. 29 # FINI_START, FINI_END - statements just before and just after 30 # combination of .fini sections. 31 # 32 # When adding sections, do note that the names of some sections are used 33 # when specifying the start address of the next. 34 # 35 36 # Many sections come in three flavours. There is the 'real' section, 37 # like ".data". Then there are the per-procedure or per-variable 38 # sections, generated by -ffunction-sections and -fdata-sections in GCC, 39 # and useful for --gc-sections, which for a variable "foo" might be 40 # ".data.foo". Then there are the linkonce sections, for which the linker 41 # eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 42 # The exact correspondences are: 43 # 44 # Section Linkonce section 45 # .text .gnu.linkonce.t.foo 46 # .rodata .gnu.linkonce.r.foo 47 # .data .gnu.linkonce.d.foo 48 # .bss .gnu.linkonce.b.foo 49 # .sdata .gnu.linkonce.s.foo 50 # .sbss .gnu.linkonce.sb.foo 51 # .sdata2 .gnu.linkonce.s2.foo 52 # .sbss2 .gnu.linkonce.sb2.foo 53 # 54 # Each of these can also have corresponding .rel.* and .rela.* sections. 55 56 test -z "$ENTRY" && ENTRY=_start 57 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 58 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 59 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 60 test -z "${ELFSIZE}" && ELFSIZE=32 61 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 62 CTOR=".ctors ${CONSTRUCTING-0} : 63 { 64 ${CONSTRUCTING+${CTOR_START}} 65 /* gcc uses crtbegin.o to find the start of 66 the constructors, so we make sure it is 67 first. Because this is a wildcard, it 68 doesn't matter if the user does not 69 actually link against crtbegin.o; the 70 linker won't look for a file to match a 71 wildcard. The wildcard also means that it 72 doesn't matter which directory crtbegin.o 73 is in. */ 74 75 KEEP (*crtbegin.o(.ctors)) 76 KEEP (*crtbegin?.o(.ctors)) 77 78 /* We don't want to include the .ctor section from 79 the crtend.o file until after the sorted ctors. 80 The .ctor section from the crtend file contains the 81 end of ctors marker and it must be last */ 82 83 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .ctors)) 84 KEEP (*(SORT(.ctors.*))) 85 KEEP (*(.ctors)) 86 ${CONSTRUCTING+${CTOR_END}} 87 } > ROM" 88 89 DTOR=" .dtors ${CONSTRUCTING-0} : 90 { 91 ${CONSTRUCTING+${DTOR_START}} 92 KEEP (*crtbegin.o(.dtors)) 93 KEEP (*crtbegin?.o(.dtors)) 94 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .dtors)) 95 KEEP (*(SORT(.dtors.*))) 96 KEEP (*(.dtors)) 97 ${CONSTRUCTING+${DTOR_END}} 98 } > ROM" 99 100 cat <<EOF 101 /* Copyright (C) 2014 Free Software Foundation, Inc. 102 103 Copying and distribution of this script, with or without modification, 104 are permitted in any medium without royalty provided the copyright 105 notice and this notice are preserved. */ 106 107 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 108 "${LITTLE_OUTPUT_FORMAT}") 109 OUTPUT_ARCH(${OUTPUT_ARCH}) 110 ${RELOCATING+ENTRY(${ENTRY})} 111 112 ${RELOCATING+${LIB_SEARCH_DIRS}} 113 ${RELOCATING+${EXECUTABLE_SYMBOLS}} 114 ${RELOCATING+${INPUT_FILES}} 115 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables 116 if gld -r is used and the intermediate file has sections starting 117 at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld 118 bug. But for now assigning the zero vmas works. */} 119 120 /* There are two memory regions we care about, one from 0 through 0x7F00 121 that is RAM and one from 0x8000 up which is ROM. */ 122 MEMORY 123 { 124 RAM (w) : ORIGIN = 0, LENGTH = 0x7F00 125 ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000 126 } 127 128 SECTIONS 129 { 130 .data ${RELOCATING-0} : 131 { 132 ${RELOCATING+__rdata = .;} 133 ${RELOCATING+__data = .;} 134 ${RELOCATING+${DATA_START_SYMBOLS}} 135 *(.data) 136 ${RELOCATING+*(.data.*)} 137 ${RELOCATING+*(.gnu.linkonce.d.*)} 138 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 139 } > RAM 140 ${RELOCATING+${OTHER_READWRITE_SECTIONS}} 141 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 142 ${RELOCATING+${OTHER_GOT_SECTIONS}} 143 ${RELOCATING+_edata = .;} 144 ${RELOCATING+PROVIDE (edata = .);} 145 ${RELOCATING+__bss_start = .;} 146 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 147 .bss ${RELOCATING-0} : 148 { 149 *(.dynbss) 150 *(.bss) 151 ${RELOCATING+*(.bss.*)} 152 ${RELOCATING+*(.gnu.linkonce.b.*)} 153 *(COMMON) 154 /* Align here to ensure that the .bss section occupies space up to 155 _end. Align after .bss to ensure correct alignment even if the 156 .bss section disappears because there are no input sections. */ 157 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 158 } > RAM 159 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 160 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 161 ${RELOCATING+${OTHER_END_SYMBOLS}} 162 ${RELOCATING+_end = .;} 163 ${RELOCATING+__stack = .;} 164 ${RELOCATING+PROVIDE (end = .);} 165 166 /* Read-only sections in ROM. */ 167 .int_vec ${RELOCATING-0} : { *(.int_vec) } ${RELOCATING+> ROM} 168 169 .rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} } ${RELOCATING+> ROM} 170 ${RELOCATING+${CTOR}} 171 ${RELOCATING+${DTOR}} 172 .jcr : { KEEP (*(.jcr)) } ${RELOCATING+> ROM} 173 .eh_frame : { KEEP (*(.eh_frame)) } ${RELOCATING+> ROM} 174 .gcc_except_table : { *(.gcc_except_table) *(.gcc_except_table.*) } ${RELOCATING+> ROM} 175 .plt : { *(.plt) } ${RELOCATING+> ROM} 176 177 .text ${RELOCATING-0} : 178 { 179 ${RELOCATING+${TEXT_START_SYMBOLS}} 180 *(.text) 181 ${RELOCATING+*(.text.*)} 182 *(.stub) 183 /* .gnu.warning sections are handled specially by elf32.em. */ 184 *(.gnu.warning) 185 ${RELOCATING+*(.gnu.linkonce.t.*)} 186 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 187 } ${RELOCATING+> ROM =${NOP-0}} 188 .init ${RELOCATING-0} : 189 { 190 ${RELOCATING+${INIT_START}} 191 KEEP (*(.init)) 192 ${RELOCATING+${INIT_END}} 193 } ${RELOCATING+> ROM =${NOP-0}} 194 .fini ${RELOCATING-0} : 195 { 196 ${RELOCATING+${FINI_START}} 197 KEEP (*(.fini)) 198 ${RELOCATING+${FINI_END}} 199 } ${RELOCATING+> ROM =${NOP-0}} 200 ${RELOCATING+PROVIDE (__etext = .);} 201 ${RELOCATING+PROVIDE (_etext = .);} 202 ${RELOCATING+PROVIDE (etext = .);} 203 ${RELOCATING+${OTHER_READONLY_SECTIONS}} 204 205 206 /* Stabs debugging sections. */ 207 .stab 0 : { *(.stab) } 208 .stabstr 0 : { *(.stabstr) } 209 .stab.excl 0 : { *(.stab.excl) } 210 .stab.exclstr 0 : { *(.stab.exclstr) } 211 .stab.index 0 : { *(.stab.index) } 212 .stab.indexstr 0 : { *(.stab.indexstr) } 213 214 .comment 0 : { *(.comment) } 215 216 EOF 217 218 . $srcdir/scripttempl/DWARF.sc 219 220 cat <<EOF 221 ${RELOCATING+${OTHER_RELOCATING_SECTIONS}} 222 223 /* These must appear regardless of ${RELOCATING}. */ 224 ${OTHER_SECTIONS} 225 } 226 EOF 227
