Controlling Mapfiles with the -k Option

The -k option to ld specifies a text file containing mapfile directives:

ld -k mapfile [flags] files ...

The ld command automatically maps sections from input object files onto output segments in executable files. The mapfile option allows you to change the default mapping provided by the linker.

Use the -k filename option to specify a text file that contains mapfile directives. The linker appends the specified mapfile to the default mapfile unless you specify the +nodefaultmap option.

Mapfile Example: Using -k filename (without +nodefaultmap Option):

cat mapfile

text = LOAD ?RX V0x1000;
text : .rodata;
text : .PARISC.milli;
text : .dynamic;
text : .dynsym;
text : .dynstr;
text : .hash;
text : $PROGBITS ?AX;
text : .PARISC.unwind;
text : $UNWIND;
data = LOAD ?RW V0x4000000040001000;
data : .opd;
data : .plt;
data : .dlt;
data : .data;
data : $PROGBITS ?AW!S;
data : .sdata;
data : $PROGBITS ?AWS;
data : .sbss;
data : $NOBITS ?AWS;
data : .bss;
data : $NOBITS ?AW!S;
note = NOTE;
note : $NOTE;

ld main.o -k mapfile -lc

elfdump -h -S a.out

a.out:

	*** Section Header ***Index 	Type	Vaddr	Offset	Size	Name1 	DYNM	00000000000012a8	00000000000002a8	00000120	.dynamic
1 	DYNM	00000000000011c8	00000000000001c8	00000120	.dynamic
2	DYNS	00000000000012e8	00000000000002e8	00000270	.dynsym
3	STRT	0000000000001558	0000000000000558	00000113	.dynstr
4	HASH	0000000000001670	0000000000000670	000000a4	.hash
5	PBIT	0000000000001718	0000000000000718	00000044	.text
6	PBIT	000000000000175c	000000000000075c	00000018	.interp
10	RELA	0000000000001778	0000000000000778	00000000	.rela.opd
15	PBIT	4000000040001020	0000000000001020	00000010	.plt
16	PBIT	4000000040001030	0000000000001030	00000000	.dlt
17	PBIT	4000000040001030	0000000000001030	00000000	.data
18	PBIT	4000000040001030	0000000000001030	00000000	.HP.init
19	PBIT	4000000040001030	0000000000001030	00000000	.preinit
20	PBIT	4000000040001030	0000000000001030	00000000	.init
21	PBIT	4000000040001030	0000000000001030	00000000	.fini
22	PBIT	4000000040001030	0000000000001030	00000008	.sdata
23	NOBI	4000000040001038	0000000000001038	00000008	.bss
24	NOBI	0000000000000000	0000000000001038	00000000	.tbss
25	STRT	0000000000000000	0000000000001038	000001b2	.strtab
26	SYMT	0000000000000000	00000000000011ec	000004b0	.symtab
27	STRT	0000000000000000	000000000000169c	000000de	.shstrtab

Controlling Mapfiles with the -k Option

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Mapfile Example: Using -k filename (without +nodefaultmap Option):