1#
2# Unusual variables checked by this code:
3#	NOP - two byte opcode for no-op (defaults to 0)
4#	INITIAL_READONLY_SECTIONS - at start of text segment
5#	OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
6#		(e.g., .PARISC.milli)
7#	OTHER_TEXT_SECTIONS - these get put in .text when relocating
8#	OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
9#		(e.g., .PARISC.global)
10#	OTHER_BSS_SECTIONS - other than .bss .sbss ...
11#	OTHER_SECTIONS - at the end
12#	EXECUTABLE_SYMBOLS - symbols that must be defined for an
13#		executable (e.g., _DYNAMIC_LINK)
14#	TEXT_START_SYMBOLS - symbols that appear at the start of the
15#		.text section.
16#	DATA_START_SYMBOLS - symbols that appear at the start of the
17#		.data section.
18#	OTHER_GOT_SYMBOLS - symbols defined just before .got.
19#	OTHER_GOT_SECTIONS - sections just after .got and .sdata.
20#	OTHER_BSS_SYMBOLS - symbols that appear at the start of the
21#		.bss section besides __bss_start.
22#	INPUT_FILES - INPUT command of files to always include
23#	INIT_START, INIT_END -  statements just before and just after
24# 	combination of .init sections.
25#	FINI_START, FINI_END - statements just before and just after
26# 	combination of .fini sections.
27#
28# When adding sections, do note that the names of some sections are used
29# when specifying the start address of the next.
30#
31
32#  Many sections come in three flavours.  There is the 'real' section,
33#  like ".data".  Then there are the per-procedure or per-variable
34#  sections, generated by -ffunction-sections and -fdata-sections in GCC,
35#  and useful for --gc-sections, which for a variable "foo" might be
36#  ".data.foo".  Then there are the linkonce sections, for which the linker
37#  eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
38#  The exact correspondences are:
39#
40#  Section	Linkonce section
41#  .text	.gnu.linkonce.t.foo
42#  .rodata	.gnu.linkonce.r.foo
43#  .data	.gnu.linkonce.d.foo
44#  .bss		.gnu.linkonce.b.foo
45#  .sdata	.gnu.linkonce.s.foo
46#  .sbss	.gnu.linkonce.sb.foo
47#  .sdata2	.gnu.linkonce.s2.foo
48#  .sbss2	.gnu.linkonce.sb2.foo
49#
50#  Each of these can also have corresponding .rel.* and .rela.* sections.
51
52test -z "$ENTRY" && ENTRY=_start
53test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
54test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
55if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
56test -z "${ELFSIZE}" && ELFSIZE=32
57test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
58CTOR=".ctors ${CONSTRUCTING-0} :
59  {
60    ${CONSTRUCTING+${CTOR_START}}
61    /* gcc uses crtbegin.o to find the start of
62       the constructors, so we make sure it is
63       first.  Because this is a wildcard, it
64       doesn't matter if the user does not
65       actually link against crtbegin.o; the
66       linker won't look for a file to match a
67       wildcard.  The wildcard also means that it
68       doesn't matter which directory crtbegin.o
69       is in.  */
70
71    KEEP (*crtbegin*.o(.ctors))
72
73    /* We don't want to include the .ctor section from
74       from the crtend.o file until after the sorted ctors.
75       The .ctor section from the crtend file contains the
76       end of ctors marker and it must be last */
77
78    KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors))
79    KEEP (*(SORT(.ctors.*)))
80    KEEP (*(.ctors))
81    ${CONSTRUCTING+${CTOR_END}}
82  } > ROM"
83
84DTOR=" .dtors       ${CONSTRUCTING-0} :
85  {
86    ${CONSTRUCTING+${DTOR_START}}
87    KEEP (*crtbegin*.o(.dtors))
88    KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors))
89    KEEP (*(SORT(.dtors.*)))
90    KEEP (*(.dtors))
91    ${CONSTRUCTING+${DTOR_END}}
92  } > ROM"
93
94cat <<EOF
95OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
96	      "${LITTLE_OUTPUT_FORMAT}")
97OUTPUT_ARCH(${OUTPUT_ARCH})
98ENTRY(${ENTRY})
99
100${RELOCATING+${LIB_SEARCH_DIRS}}
101${RELOCATING+${EXECUTABLE_SYMBOLS}}
102${RELOCATING+${INPUT_FILES}}
103${RELOCATING- /* For some reason, the Solaris linker makes bad executables
104  if gld -r is used and the intermediate file has sections starting
105  at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
106  bug.  But for now assigning the zero vmas works.  */}
107
108/* There are two memory regions we care about, one from 0 through 0x7F00
109   that is RAM and one from 0x8000 up which is ROM.  */
110MEMORY
111{
112  RAM (w) : ORIGIN = 0, LENGTH = 0x7F00
113  ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000
114}
115
116SECTIONS
117{
118  .data  ${RELOCATING-0} :
119  {
120    ${RELOCATING+__rdata = .;}
121    ${RELOCATING+__data = .;}
122    ${RELOCATING+${DATA_START_SYMBOLS}}
123    *(.data)
124    ${RELOCATING+*(.data.*)}
125    ${RELOCATING+*(.gnu.linkonce.d.*)}
126    ${CONSTRUCTING+SORT(CONSTRUCTORS)}
127  } > RAM
128  ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
129  ${RELOCATING+${OTHER_GOT_SYMBOLS}}
130  ${RELOCATING+${OTHER_GOT_SECTIONS}}
131  ${RELOCATING+_edata = .;}
132  ${RELOCATING+PROVIDE (edata = .);}
133  ${RELOCATING+__bss_start = .;}
134  ${RELOCATING+${OTHER_BSS_SYMBOLS}}
135  .bss     ${RELOCATING-0} :
136  {
137   *(.dynbss)
138   *(.bss)
139   ${RELOCATING+*(.bss.*)}
140   ${RELOCATING+*(.gnu.linkonce.b.*)}
141   *(COMMON)
142   /* Align here to ensure that the .bss section occupies space up to
143      _end.  Align after .bss to ensure correct alignment even if the
144      .bss section disappears because there are no input sections.  */
145   ${RELOCATING+. = ALIGN(${ALIGNMENT});}
146  } > RAM
147  ${RELOCATING+${OTHER_BSS_SECTIONS}}
148  ${RELOCATING+. = ALIGN(${ALIGNMENT});}
149  ${RELOCATING+_end = .;}
150  ${RELOCATING+__stack = .;}
151  ${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
152  ${RELOCATING+PROVIDE (end = .);}
153
154  /* Read-only sections in ROM.  */
155  .int_vec     ${RELOCATING-0} : { *(.int_vec)	} > ROM
156
157  .rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} } > ROM
158  ${RELOCATING+${CTOR}}
159  ${RELOCATING+${DTOR}}
160  .jcr : { KEEP (*(.jcr)) } > ROM
161  .eh_frame : { KEEP (*(.eh_frame)) } > ROM
162  .gcc_except_table : { *(.gcc_except_table) } > ROM
163  .plt : { *(.plt) } > ROM
164
165  .text    ${RELOCATING-0} :
166  {
167    ${RELOCATING+${TEXT_START_SYMBOLS}}
168    *(.text)
169    ${RELOCATING+*(.text.*)}
170    *(.stub)
171    /* .gnu.warning sections are handled specially by elf32.em.  */
172    *(.gnu.warning)
173    ${RELOCATING+*(.gnu.linkonce.t.*)}
174    ${RELOCATING+${OTHER_TEXT_SECTIONS}}
175  } > ROM =${NOP-0}
176  .init        ${RELOCATING-0} :
177  {
178    ${RELOCATING+${INIT_START}}
179    KEEP (*(.init))
180    ${RELOCATING+${INIT_END}}
181  } > ROM =${NOP-0}
182  .fini    ${RELOCATING-0} :
183  {
184    ${RELOCATING+${FINI_START}}
185    KEEP (*(.fini))
186    ${RELOCATING+${FINI_END}}
187  } > ROM =${NOP-0}
188  ${RELOCATING+PROVIDE (__etext = .);}
189  ${RELOCATING+PROVIDE (_etext = .);}
190  ${RELOCATING+PROVIDE (etext = .);}
191  ${RELOCATING+${OTHER_READONLY_SECTIONS}}
192
193
194  /* Stabs debugging sections.  */
195  .stab 0 : { *(.stab) }
196  .stabstr 0 : { *(.stabstr) }
197  .stab.excl 0 : { *(.stab.excl) }
198  .stab.exclstr 0 : { *(.stab.exclstr) }
199  .stab.index 0 : { *(.stab.index) }
200  .stab.indexstr 0 : { *(.stab.indexstr) }
201
202  .comment 0 : { *(.comment) }
203
204  /* DWARF debug sections.
205     Symbols in the DWARF debugging sections are relative to the beginning
206     of the section so we begin them at 0.  */
207
208  /* DWARF 1 */
209  .debug          0 : { *(.debug) }
210  .line           0 : { *(.line) }
211
212  /* GNU DWARF 1 extensions */
213  .debug_srcinfo  0 : { *(.debug_srcinfo) }
214  .debug_sfnames  0 : { *(.debug_sfnames) }
215
216  /* DWARF 1.1 and DWARF 2 */
217  .debug_aranges  0 : { *(.debug_aranges) }
218  .debug_pubnames 0 : { *(.debug_pubnames) }
219
220  /* DWARF 2 */
221  .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
222  .debug_abbrev   0 : { *(.debug_abbrev) }
223  .debug_line     0 : { *(.debug_line) }
224  .debug_frame    0 : { *(.debug_frame) }
225  .debug_str      0 : { *(.debug_str) }
226  .debug_loc      0 : { *(.debug_loc) }
227  .debug_macinfo  0 : { *(.debug_macinfo) }
228
229  /* SGI/MIPS DWARF 2 extensions */
230  .debug_weaknames 0 : { *(.debug_weaknames) }
231  .debug_funcnames 0 : { *(.debug_funcnames) }
232  .debug_typenames 0 : { *(.debug_typenames) }
233  .debug_varnames  0 : { *(.debug_varnames) }
234
235  ${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
236
237  /* These must appear regardless of ${RELOCATING}.  */
238  ${OTHER_SECTIONS}
239}
240EOF
241