1#
2# Unusual variables checked by this code:
3#	NOP - four byte opcode for no-op (defaults to 0)
4#	NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not
5#		empty.
6#	DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
7#	INITIAL_READONLY_SECTIONS - at start of text segment
8#	OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
9#		(e.g., .PARISC.milli)
10#	OTHER_TEXT_SECTIONS - these get put in .text when relocating
11#	OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
12#		(e.g., .PARISC.global)
13#	OTHER_SECTIONS - at the end
14#	EXECUTABLE_SYMBOLS - symbols that must be defined for an
15#		executable (e.g., _DYNAMIC_LINK)
16#	TEXT_START_SYMBOLS - symbols that appear at the start of the
17#		.text section.
18#	DATA_START_SYMBOLS - symbols that appear at the start of the
19#		.data section.
20#	OTHER_GOT_SYMBOLS - symbols defined just before .got.
21#	OTHER_GOT_SECTIONS - sections just after .got.
22#	OTHER_SDATA_SECTIONS - sections just after .sdata.
23#	OTHER_BSS_SYMBOLS - symbols that appear at the start of the
24#		.bss section besides __bss_start.
25#	DATA_PLT - .plt should be in data segment, not text segment.
26#	BSS_PLT - .plt should be in bss segment
27#	TEXT_DYNAMIC - .dynamic in text segment, not data segment.
28#	EMBEDDED - whether this is for an embedded system.
29#	SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set
30#		start address of shared library.
31#	INPUT_FILES - INPUT command of files to always include
32#	WRITABLE_RODATA - if set, the .rodata section should be writable
33#	INIT_START, INIT_END -  statements just before and just after
34# 	combination of .init sections.
35#	FINI_START, FINI_END - statements just before and just after
36# 	combination of .fini sections.
37#	STACK_ADDR - start of a .stack section.
38#	OTHER_SYMBOLS - symbols to place right at the end of the script.
39#
40# When adding sections, do note that the names of some sections are used
41# when specifying the start address of the next.
42#
43
44#  Many sections come in three flavours.  There is the 'real' section,
45#  like ".data".  Then there are the per-procedure or per-variable
46#  sections, generated by -ffunction-sections and -fdata-sections in GCC,
47#  and useful for --gc-sections, which for a variable "foo" might be
48#  ".data.foo".  Then there are the linkonce sections, for which the linker
49#  eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
50#  The exact correspondences are:
51#
52#  Section	Linkonce section
53#  .text	.gnu.linkonce.t.foo
54#  .rodata	.gnu.linkonce.r.foo
55#  .data	.gnu.linkonce.d.foo
56#  .bss		.gnu.linkonce.b.foo
57#  .sdata	.gnu.linkonce.s.foo
58#  .sbss	.gnu.linkonce.sb.foo
59#  .sdata2	.gnu.linkonce.s2.foo
60#  .sbss2	.gnu.linkonce.sb2.foo
61#  .debug_info	.gnu.linkonce.wi.foo
62#
63#  Each of these can also have corresponding .rel.* and .rela.* sections.
64
65test -z "$ENTRY" && ENTRY=_start
66test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
67test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
68if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
69test -z "${ELFSIZE}" && ELFSIZE=32
70test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
71test "$LD_FLAG" = "N" && DATA_ADDR=.
72INTERP=".interp       ${RELOCATING-0} : { *(.interp) }"
73PLT=".plt          ${RELOCATING-0} : { *(.plt) }"
74DYNAMIC=".dynamic      ${RELOCATING-0} : { *(.dynamic) }"
75RODATA=".rodata       ${RELOCATING-0} : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }"
76if test -z "${NO_SMALL_DATA}"; then
77  SBSS=".sbss         ${RELOCATING-0} :
78  {
79    ${RELOCATING+PROVIDE (__sbss_start = .);}
80    ${RELOCATING+PROVIDE (___sbss_start = .);}
81    *(.dynsbss)
82    *(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*})
83    *(.scommon)
84    ${RELOCATING+PROVIDE (__sbss_end = .);}
85    ${RELOCATING+PROVIDE (___sbss_end = .);}
86  }"
87  SBSS2=".sbss2        ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) }"
88  SDATA="/* We want the small data sections together, so single-instruction offsets
89     can access them all, and initialized data all before uninitialized, so
90     we can shorten the on-disk segment size.  */
91  .sdata        ${RELOCATING-0} :
92  {
93    ${RELOCATING+${SDATA_START_SYMBOLS}}
94    *(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*})
95  }"
96  SDATA2=".sdata2       ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) }"
97  REL_SDATA=".rel.sdata    ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) }
98  .rela.sdata   ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }"
99  REL_SBSS=".rel.sbss     ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) }
100  .rela.sbss    ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }"
101  REL_SDATA2=".rel.sdata2   ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) }
102  .rela.sdata2  ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }"
103  REL_SBSS2=".rel.sbss2    ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) }
104  .rela.sbss2   ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }"
105fi
106CTOR="
107    ${CONSTRUCTING+${CTOR_START}}
108    /* gcc uses crtbegin.o to find the start of
109       the constructors, so we make sure it is
110       first.  Because this is a wildcard, it
111       doesn't matter if the user does not
112       actually link against crtbegin.o; the
113       linker won't look for a file to match a
114       wildcard.  The wildcard also means that it
115       doesn't matter which directory crtbegin.o
116       is in.  */
117
118    KEEP (*crtbegin*.o(.ctors))
119
120    /* We don't want to include the .ctor section from
121       the crtend.o file until after the sorted ctors.
122       The .ctor section from the crtend file contains the
123       end of ctors marker and it must be last */
124
125    KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors))
126    KEEP (*(SORT(.ctors.*)))
127    KEEP (*(.ctors))
128    ${CONSTRUCTING+${CTOR_END}}
129"
130DTOR="
131    ${CONSTRUCTING+${DTOR_START}}
132    KEEP (*crtbegin*.o(.dtors))
133    KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors))
134    KEEP (*(SORT(.dtors.*)))
135    KEEP (*(.dtors))
136    ${CONSTRUCTING+${DTOR_END}}
137"
138STACK="  .stack        ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} :
139  {
140    ${RELOCATING+_stack = .;}
141    *(.stack)
142  }"
143
144test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}"
145
146cat <<EOF
147OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
148	      "${LITTLE_OUTPUT_FORMAT}")
149OUTPUT_ARCH(${OUTPUT_ARCH})
150ENTRY(${ENTRY})
151
152${RELOCATING+${LIB_SEARCH_DIRS}}
153${RELOCATING+/* Do we need any of these for elf?
154   __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}}  */}
155${RELOCATING+${EXECUTABLE_SYMBOLS}}
156${RELOCATING+${INPUT_FILES}}
157${RELOCATING- /* For some reason, the Solaris linker makes bad executables
158  if gld -r is used and the intermediate file has sections starting
159  at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
160  bug.  But for now assigning the zero vmas works.  */}
161
162SECTIONS
163{
164  /* Read-only sections, merged into text segment: */
165  ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}
166  ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}}
167  ${CREATE_SHLIB-${INTERP}}
168  ${INITIAL_READONLY_SECTIONS}
169  ${TEXT_DYNAMIC+${DYNAMIC}}
170  .hash         ${RELOCATING-0} : { *(.hash) }
171  .dynsym       ${RELOCATING-0} : { *(.dynsym) }
172  .dynstr       ${RELOCATING-0} : { *(.dynstr) }
173  .gnu.version  ${RELOCATING-0} : { *(.gnu.version) }
174  .gnu.version_d ${RELOCATING-0}: { *(.gnu.version_d) }
175  .gnu.version_r ${RELOCATING-0}: { *(.gnu.version_r) }
176
177EOF
178if [ "x$COMBRELOC" = x ]; then
179  COMBRELOCCAT=cat
180else
181  COMBRELOCCAT="cat > $COMBRELOC"
182fi
183eval $COMBRELOCCAT <<EOF
184  .rel.init     ${RELOCATING-0} : { *(.rel.init) }
185  .rela.init    ${RELOCATING-0} : { *(.rela.init) }
186  .rel.text     ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) }
187  .rela.text    ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) }
188  .rel.fini     ${RELOCATING-0} : { *(.rel.fini) }
189  .rela.fini    ${RELOCATING-0} : { *(.rela.fini) }
190  .rel.rodata   ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) }
191  .rela.rodata  ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) }
192  ${OTHER_READONLY_RELOC_SECTIONS}
193  .rel.data     ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) }
194  .rela.data    ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) }
195  .rel.ctors    ${RELOCATING-0} : { *(.rel.ctors) }
196  .rela.ctors   ${RELOCATING-0} : { *(.rela.ctors) }
197  .rel.dtors    ${RELOCATING-0} : { *(.rel.dtors) }
198  .rela.dtors   ${RELOCATING-0} : { *(.rela.dtors) }
199  .rel.got      ${RELOCATING-0} : { *(.rel.got) }
200  .rela.got     ${RELOCATING-0} : { *(.rela.got) }
201  ${OTHER_GOT_RELOC_SECTIONS}
202  ${REL_SDATA}
203  ${REL_SBSS}
204  ${REL_SDATA2}
205  ${REL_SBSS2}
206  .rel.bss      ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) }
207  .rela.bss     ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) }
208EOF
209if [ -n "$COMBRELOC" ]; then
210cat <<EOF
211  .rel.dyn      ${RELOCATING-0} :
212    {
213EOF
214sed -e '/^[ 	]*[{}][ 	]*$/d;/:[ 	]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/      \1/' $COMBRELOC
215cat <<EOF
216    }
217  .rela.dyn     ${RELOCATING-0} :
218    {
219EOF
220sed -e '/^[ 	]*[{}][ 	]*$/d;/:[ 	]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/      \1/' $COMBRELOC
221cat <<EOF
222    }
223EOF
224fi
225cat <<EOF
226  . = ALIGN(0x1000);
227  .rel.plt      ${RELOCATING-0} : { *(.rel.plt) }
228  .rela.plt     ${RELOCATING-0} : { *(.rela.plt) }
229  ${OTHER_PLT_RELOC_SECTIONS}
230  ${DATA_PLT-${BSS_PLT-${PLT}}}
231  .text         ${RELOCATING-0} :
232  {
233    ${RELOCATING+${TEXT_START_SYMBOLS}}
234    *(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*})
235    /* .gnu.warning sections are handled specially by elf32.em.  */
236    *(.gnu.warning)
237    ${RELOCATING+${OTHER_TEXT_SECTIONS}}
238  } =${NOP-0}
239  .fini         ${RELOCATING-0} :
240  {
241    ${RELOCATING+${FINI_START}}
242    KEEP (*(.fini))
243    ${RELOCATING+${FINI_END}}
244  } =${NOP-0}
245  ${RELOCATING+PROVIDE (__etext = .);}
246  ${RELOCATING+PROVIDE (_etext = .);}
247  ${RELOCATING+PROVIDE (etext = .);}
248  . = ALIGN(0x1000);
249  ${CREATE_SHLIB-${SDATA2}}
250  ${CREATE_SHLIB-${SBSS2}}
251  ${OTHER_READONLY_SECTIONS}
252  .eh_frame_hdr : { *(.eh_frame_hdr) }
253
254  . = ALIGN(0x1000);
255  .data         ${RELOCATING-0} :
256  {
257    *(.rodata .rodata.*)
258    *(.rodata1)
259    *(.gnu.linkonce.r.*)
260    ${RELOCATING+${DATA_START_SYMBOLS}}
261    *(.data${RELOCATING+ .data.* .gnu.linkonce.d.*})
262    ${CONSTRUCTING+SORT(CONSTRUCTORS)}
263    KEEP (*(.eh_frame))
264    *(.gcc_except_table)
265    ${CTOR}
266    ${DTOR}
267    KEEP (*(.jcr))
268  }
269  .data1        ${RELOCATING-0} : { *(.data1) }
270  . = ALIGN(0x1000);
271  .gcc_except_table ${RELOCATING-0} : { *(.gcc_except_table) }
272  ${WRITABLE_RODATA+${RODATA}}
273  ${OTHER_READWRITE_SECTIONS}
274  ${TEXT_DYNAMIC-${DYNAMIC}}
275  ${DATA_PLT+${PLT}}
276  ${RELOCATING+${OTHER_GOT_SYMBOLS}}
277  .got          ${RELOCATING-0} : { *(.got.plt) *(.got) }
278  ${OTHER_GOT_SECTIONS}
279  ${CREATE_SHLIB+${SDATA2}}
280  ${CREATE_SHLIB+${SBSS2}}
281  ${SDATA}
282  ${OTHER_SDATA_SECTIONS}
283  ${RELOCATING+_edata = .;}
284  ${RELOCATING+PROVIDE (edata = .);}
285  ${RELOCATING+__bss_start = .;}
286  ${RELOCATING+${OTHER_BSS_SYMBOLS}}
287  ${SBSS}
288  ${BSS_PLT+${PLT}}
289  . = ALIGN(0x1000);
290  .bss          ${RELOCATING-0} :
291  {
292   *(.dynbss)
293   *(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*})
294   *(COMMON)
295   /* Align here to ensure that the .bss section occupies space up to
296      _end.  Align after .bss to ensure correct alignment even if the
297      .bss section disappears because there are no input sections.  */
298   ${RELOCATING+. = ALIGN(${ALIGNMENT});}
299  }
300  ${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
301  ${RELOCATING+. = ALIGN(${ALIGNMENT});}
302  ${RELOCATING+${OTHER_END_SYMBOLS}}
303  ${RELOCATING+_end = .;}
304  ${RELOCATING+PROVIDE (end = .);}
305
306  /* Stabs debugging sections.  */
307  . = ALIGN(0x1000);
308  .stab          0 : { *(.stab) }
309  .stabstr       0 : { *(.stabstr) }
310  .stab.excl     0 : { *(.stab.excl) }
311  .stab.exclstr  0 : { *(.stab.exclstr) }
312  .stab.index    0 : { *(.stab.index) }
313  .stab.indexstr 0 : { *(.stab.indexstr) }
314
315  . = ALIGN(0x1000);
316  .comment       0 : { *(.comment) }
317
318  /* DWARF debug sections.
319     Symbols in the DWARF debugging sections are relative to the beginning
320     of the section so we begin them at 0.  */
321
322  /* DWARF 1 */
323  .debug          0 : { *(.debug) }
324  .line           0 : { *(.line) }
325
326  /* GNU DWARF 1 extensions */
327  .debug_srcinfo  0 : { *(.debug_srcinfo) }
328  .debug_sfnames  0 : { *(.debug_sfnames) }
329
330  /* DWARF 1.1 and DWARF 2 */
331  .debug_aranges  0 : { *(.debug_aranges) }
332  .debug_pubnames 0 : { *(.debug_pubnames) }
333
334  /* DWARF 2 */
335  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
336  .debug_abbrev   0 : { *(.debug_abbrev) }
337  .debug_line     0 : { *(.debug_line) }
338  .debug_frame    0 : { *(.debug_frame) }
339  .debug_str      0 : { *(.debug_str) }
340  .debug_loc      0 : { *(.debug_loc) }
341  .debug_macinfo  0 : { *(.debug_macinfo) }
342
343  /* SGI/MIPS DWARF 2 extensions */
344  .debug_weaknames 0 : { *(.debug_weaknames) }
345  .debug_funcnames 0 : { *(.debug_funcnames) }
346  .debug_typenames 0 : { *(.debug_typenames) }
347  .debug_varnames  0 : { *(.debug_varnames) }
348
349  ${STACK_ADDR+${STACK}}
350  ${OTHER_SECTIONS}
351  ${RELOCATING+${OTHER_SYMBOLS}}
352}
353EOF
354