Hello,
While compiling a boot code for my embedded device that will load ELKS
from the Flash, I get some trouble while linking several object files
together, some of them are .S compiled with AS86, others are .C
compiled with BCC. Let me explain with a unit test to insulate the
problem:
Here is the first source file "test1.s":
.extern _main
.define _entry
.text
_entry: br _main
end
Here is the second souce file "test2.c":
extern void entry ();
void main () { entry (); }
These simple sources make 2 cross references with 2 exports and 2
imports in each object files.
Here is the object file generated by "as86 -o test1.o test1.s"
(objdump86 test1.o):
OBJECTFILE 'test1.o'
MODULE 'test1'
BYTEPOS 00000038
BINLEN 00000003
STRINGS 0025 +0013
VERSION 0.0
SEG0 00000003
SYMS 2
SYM 0 00000000 ...IT _main
SYM 1 00000000 ..E.T _entry
text data bss dec hex filename
3 0 0 3 3 test1.o
BYTECODE
SEG 0
: e9 .
RELSZ 2
DW _main-PC
In the symbol table, we can see both the public import & text, and the
public export & text. That looks correct.
Now here is the object file generated by "bcc -ansi -c -o test2.o
test2.c" (objdump86 test2.o):
OBJECTFILE 'test2.o'
MODULE 'test2'
BYTEPOS 00000038
BINLEN 0000000c
STRINGS 0025 +0013
VERSION 0.0
SEG0 0000000c
SYMS 2
SYM 0 00000000 ..E.T _main
SYM 1 00000000 ...IU _entry
text data bss dec hex filename
12 0 0 12 c test2.o
BYTECODE
SEG 0
: 55 89 e5 57 56 e8 U..WV.
RELSZ 2
DW _entry-PC
: 5e 5f 5d c3 ^_].
SEG 3
This time, in the symbol table, the public & import symbol _entry has
the 'U' flag, not the 'T' as expected.
Should not it be flagged 'T' instead ?
Thanks for your support,
MFLD
PS : the "boot code" I am writting is a kind of "coreboot" for 8086,
could I name it "boot86" :-) ?
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