1# Linker Script for National Semiconductor's CRX-ELF32.
2
3# The next line should be uncommented if it is desired to link
4# without libstart.o and directly enter main.
5
6# ENTRY=_main
7
8test -z "$ENTRY" && ENTRY=_start
9cat <<EOF
10
11/* Example Linker Script for linking NS CRX elf32 files. */
12
13/* The next line forces the entry point (${ENTRY} in this script)
14   to be entered in the output file as an undefined symbol.
15   It is needed in case the entry point is not called explicitly
16   (which is the usual case) AND is in an archive.  */
17
18OUTPUT_FORMAT("${OUTPUT_FORMAT}")
19OUTPUT_ARCH(${ARCH})
20EXTERN(${ENTRY})
21ENTRY(${ENTRY})
22
23/* Define memory regions.  */
24MEMORY
25{
26        rom         : ORIGIN = 0x2,         LENGTH = 3M
27        ram         : ORIGIN = 4M,          LENGTH = 10M
28}
29
30/*  Many sections come in three flavours.  There is the 'real' section,
31    like ".data".  Then there are the per-procedure or per-variable
32    sections, generated by -ffunction-sections and -fdata-sections in GCC,
33    and useful for --gc-sections, which for a variable "foo" might be
34    ".data.foo".  Then there are the linkonce sections, for which the linker
35    eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
36    The exact correspondences are:
37
38    Section	Linkonce section
39    .text	.gnu.linkonce.t.foo
40    .rdata	.gnu.linkonce.r.foo
41    .data	.gnu.linkonce.d.foo
42    .bss	.gnu.linkonce.b.foo
43    .debug_info	.gnu.linkonce.wi.foo  */
44
45SECTIONS
46{
47  .init :
48  {
49    __INIT_START = .;
50    KEEP (*(.init))
51    __INIT_END = .;
52  } > rom
53
54  .fini :
55  {
56    __FINI_START = .;
57    KEEP (*(.fini))
58    __FINI_END = .;
59  } > rom
60
61  .jcr :
62  {
63    KEEP (*(.jcr))
64  } > rom
65
66  .text :
67  {
68    __TEXT_START = .;
69    *(.text) *(.text.*) *(.gnu.linkonce.t.*)
70    __TEXT_END = .;
71  } > rom
72
73  .rdata :
74  {
75    __RDATA_START = .;
76    *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata.*)
77    __RDATA_END = .;
78  } > rom
79
80  .ctor ALIGN(4) :
81  {
82    __CTOR_START = .;
83    /* The compiler uses crtbegin.o to find the start
84       of the constructors, so we make sure it is
85       first.  Because this is a wildcard, it
86       doesn't matter if the user does not
87       actually link against crtbegin.o; the
88       linker won't look for a file to match a
89       wildcard.  The wildcard also means that it
90       doesn't matter which directory crtbegin.o
91       is in.  */
92
93    KEEP (*crtbegin*.o(.ctors))
94
95    /* We don't want to include the .ctor section from
96       the crtend.o file until after the sorted ctors.
97       The .ctor section from the crtend file contains the
98       end of ctors marker and it must be last */
99
100    KEEP (*(EXCLUDE_FILE (*crtend*.o) .ctors))
101    KEEP (*(SORT(.ctors.*)))
102    KEEP (*(.ctors))
103    __CTOR_END = .;
104  } > rom
105
106  .dtor ALIGN(4) :
107  {
108    __DTOR_START = .;
109    KEEP (*crtbegin*.o(.dtors))
110    KEEP (*(EXCLUDE_FILE (*crtend*.o) .dtors))
111    KEEP (*(SORT(.dtors.*)))
112    KEEP (*(.dtors))
113    __DTOR_END = .;
114  } > rom
115
116  .data :
117  {
118    __DATA_START = .;
119    *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*)
120    __DATA_END = .;
121  } > ram AT > rom
122
123  .bss (NOLOAD) :
124  {
125    __BSS_START = .;
126    *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*)
127    __BSS_END = .;
128  } > ram
129
130/* You may change the sizes of the following sections to fit the actual
131   size your program requires.
132
133   The heap and stack are aligned to the bus width, as a speed optimization
134   for accessing data located there.  */
135
136  .heap :
137  {
138    . = ALIGN(4);
139    __HEAP_START = .;
140    . += 0x2000; __HEAP_MAX = .;
141  } > ram
142
143  .stack :
144  {
145    . = ALIGN(4);
146    . += 0x6000;
147    __STACK_START = .;
148  } > ram
149
150  .istack :
151  {
152    . = ALIGN(4);
153    . += 0x100;
154    __ISTACK_START = .;
155  } > ram
156
157  .comment        0 : { *(.comment) }
158
159  /* DWARF debug sections.
160     Symbols in the DWARF debugging sections are relative to the beginning
161     of the section so we begin them at 0.  */
162
163  .debug_aranges  0 : { *(.debug_aranges) }
164  .debug_pubnames 0 : { *(.debug_pubnames) }
165  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
166  .debug_abbrev   0 : { *(.debug_abbrev) }
167  .debug_line     0 : { *(.debug_line) }
168  .debug_frame    0 : { *(.debug_frame) }
169  .debug_str      0 : { *(.debug_str) }
170  .debug_loc      0 : { *(.debug_loc) }
171  .debug_macinfo  0 : { *(.debug_macinfo) }
172}
173
174__DATA_IMAGE_START = LOADADDR(.data);
175EOF
176