https://sourceware.org/bugzilla/show_bug.cgi?id=24144
Bug ID: 24144
Summary: Gnu ld for PDP-11 is creating corrupt output. NULL
inserted in data section.
Product: binutils
Version: 2.31
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: mattislind at gmail dot com
Target Milestone: ---
When linking PDP-11 a.out files the linker seemingly random replaces bytes in
the data section with NULL bytes.
I am having trouble with a very small program in C that is compiled and linked
with PDP-11 GCC. The version is gcc version 9.0.0 20181209 (experimental)
(GCC). The host system is MACOS 10.8.5
GNU LD is version 2.31
The code is located here: https://github.com/MattisLind/pdp11-plot
make -f Makefile.pdp11
The problem is in the main.o file and the resulting testplot.o
If I do a
pdp11-aout-objdump -s main.o > main.objdump
and check the objdump I find the sequence 29 41 7d 29 2b 5c 29 14 40 at
location 23e
023e 2a521f29 417d292b 5c291440 21752621
If I do the same command on testplot.o
pdp11-aout-objdump -s testplot.o > testplot.objdump
Now at location b20 I get this
0b20 2a521f29 417d292b 5c001440 21752621
29 has became 00!
I simply cannot understand what is going wrong that could cause it to seemingly
random replace things with 00
Linking command:
testplot.o: crt0.o main.o bresenham.o pdp-xy11.o printf.o divmulmod.o xorhi3.o
ashlhi3.o
@pdp11-aout-ld -T linker-script -nostartfiles -nodefaultlibs
-nostdlib $^ -o $@
linker-script:
localhost:pdp11-plot mattislind$ cat linker-script
OUTPUT_FORMAT("a.out-pdp11")
phys = 00000200;
SECTIONS
{
.text phys : AT(phys) {
code = .;
*(.text)
*(.rodata)
. = ALIGN(0100);
}
.data : AT(phys + (data - code))
{
data = .;
*(.data)
. = ALIGN(0100);
}
.bss : AT(phys + (bss - code))
{
bss = .;
*(.bss)
. = ALIGN(0100);
}
end = .;
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