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I'm using GCC2.7 and binutsil 2.7 to target a little 68010 system
(AT&T 3b1 without UNIX). The executables I download need to
start at $3000, which I am able to do. However, when I use
objdump, all the dis-assembled addresses start at 0, even though
the jumps and load/store addresses are correct.
target=m68k-unknown-aout
host=solaris2.5
exec-prefix=68-
GCC 2.7.0 (no patches)
BinUtils 2.7 (no patches)
I would like to know what to tell the linker to locate the VMA
and LMA to $3000 also. I'm using _Ttext 0x03000 to locate things.
I was using a linker script but the got unwiedly. It does work
correctly, it just this utility output that is wierd. I drive
"ld" directly, instead of using GCC.
---------------------------------------
float % 68-objdump -d -r --show-raw-insn my_os.dli
:
00000114 <__start-2eec> 4e b9 00 00 3c 06 jsr 00003c06 <___main>
:
---------------------------------------
( $3000 - $2eec = $114 )
When I get header info from "objdump" it reveals:
---------------------------------------
float % 68-ld -V
ld version 2.7 (with BFD 2.7)
Supported emulations:
m68kaout
float % 68-objdump -h my_os.dli
my_os.dli: file format a.out-zero-big
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000c8c 00000000 00000000 00000020 2**2
CONTENTS, ALLOC, LOAD, CODE
1 .data 00000020 00000c8c 00000c8c 00000cac 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 0000002c 00000cac 00000cac 00000000 2**2
ALLOC
float %
---------------------------------------
Both VMA and LMA are $0 for .text, when they should be $03000.
I link with this (inside a script):
---------------------------------------
ld -N -Ttext 0x03000 -Map mapfile -o $DEST $LIB/crt0.o $OBJS \
-lspede -lgcc -lspede
---------------------------------------
A portion of the linker map.
---------------------------------------
Memory Configuration
Name Origin Length
*default* 0x00000000 0xffffffff
Linker script and memory map
Address of section .text set to 0x3000
LOAD /usr/local/spede/gcc68/m68k-unknown-aout/lib/crt0.o
LOAD t1.o
LOAD /usr/local/spede/gcc68/m68k-unknown-aout/lib/libspede.a
LOAD /usr/local/spede/gcc68/m68k-unknown-aout/lib/libgcc.a
LOAD /usr/local/spede/gcc68/m68k-unknown-aout/lib/libspede.a
0x00000000 PROVIDE (__stack, 0x0)
0x00002000 .=0x2000
.text 0x00003000 0xc8c
CREATE_OBJECT_SYMBOLS
*(.text)
.text 0x00003000 0x6c /usr/local/spede/gcc68/m68k-unknown-aout/l
ib/crt0.o
0x00003000 _start
0x0000306a GDBexit
.text 0x0000306c 0xb4 t1.o
: : :
.bss 0x00003cac 0x8 /usr/local/spede/gcc68/m68k-unknown-aout/l
ib/libspede.a(brk.o)
.bss 0x00003cb4 0x4 /usr/local/spede/gcc68/m68k-unknown-aout/l
ib/libgcc.a(__main.o)
*(COMMON)
COMMON 0x00003cb8 0x10 t1.o
0x00003cb8 latest
COMMON 0x00003cc8 0x10 /usr/local/spede/gcc68/m68k-unknown-aout/l
ib/libgcc.a(__main.o)
0x00003cc8 __DTOR_LIST__
0x00003cd0 __CTOR_LIST__
0x00003cd8 _end=ALIGN(0x4)
0x00003cd8 __end=ALIGN(0x4)
OUTPUT(my_os.dli a.out-zero-big)
---------------------------------------
--- The railroad train will come no more.
--- brian witt