1# Copyright (C) 2014-2016 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
56test -z "$ENTRY" && ENTRY=_start
57test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
58test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
59if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
60test -z "${ELFSIZE}" && ELFSIZE=32
61test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
62CTOR=".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
89DTOR=" .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
100cat <<EOF
101/* Copyright (C) 2014-2016 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
107OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
108	      "${LITTLE_OUTPUT_FORMAT}")
109OUTPUT_ARCH(${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.  */
122MEMORY
123{
124  RAM (w) : ORIGIN = 0, LENGTH = 0x7F00
125  ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000
126}
127
128SECTIONS
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
216EOF
217
218. $srcdir/scripttempl/DWARF.sc
219
220cat <<EOF
221  ${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
222
223  /* These must appear regardless of ${RELOCATING}.  */
224  ${OTHER_SECTIONS}
225}
226EOF
227