Silo - Modern Toolchain - Without elftoaout

Silo - Modern Toolchain - Without elftoaout

[Jim Gifford]

I have a team of people trying to figure out how to remove elftoaout 
from the Kernel and Silo builds.

We started with silo, because it won't compile with a modern toolchain, 
and after we get these techniques developed, it could then be merged 
into the kernel to also remove the depency on elftoaout.

You will need to use a 2.16.1 binutils with a patch that's going to be 
merged into the main tree.
http://sourceware.org/ml/binutils/2005-10/msg00420.html

Now we got the first.b to build with the patch at the end of this email, 
which shows our proof concept. When we tried to apply our ideas to 
second.b that's where we ran into a problem, because of the gzipping  
and whatever the util program does to the compiled object. If anyone has 
any suggestions on how to get around that issue, feel free to send me an 
email, we will try anything. We are thinking we will have to utilize an 
linker.script, but that's as far as we have gone and hence my email to 
sparc liinux community.

Patch for first/Makefile

--- Makefile.orig       2005-10-11 14:30:12.000000000 -0700
+++ Makefile    2005-10-11 14:47:54.000000000 -0700
@@ -41,12 +41,12 @@
       $(STRIP) first

first.b: first
-       $(ELFTOAOUT) -o first.b first
+       $(OBJCOPY) -O a.out-sunos-big first first.b
       echo -n 'SILO'$(IMGVERSION) | $(DD) of=first.b bs=8 conv=notrunc 
seek=3 count=1
       $(DD) if=/dev/zero of=first.b bs=4 count=1 seek\x127

ultra.o: ultra.S
-       $(CC) $(CFLAGS) -c -Wa,-Av9a ultra.S
+       $(CC) $(CFLAGS) -Wa,-Av9a -c ultra.S

ultra: ultra.o
       $(LD) $(LDFLAGS) -o ultra ultra.o
@@ -54,13 +54,13 @@
       $(STRIP) ultra

ultra.b: ultra
-       $(ELFTOAOUT) -o ultra.b ultra
+       $(OBJCOPY) -I elf32-sparc -O a.out-sunos-big ultra ultra.b
       echo -n 'SILO'$(IMGVERSION) | $(DD) of=ultra.b bs=8 conv=notrunc 
seek=3 count=1
       echo -n -e '\340' | $(DD) of=ultra.b bs=1 count=1 seek=7 
conv=notrunc
       $(DD) if=/dev/zero of=ultra.b bs=4 count=1 seek\x127

generic.o: generic.S
-       $(CC) $(CFLAGS) -c -Wa,-Av9a generic.S
+       $(CC) $(CFLAGS) -Wa,-Av9a -c generic.S

generic: generic.o
       $(LD) $(LDFLAGS) -o generic generic.o
@@ -68,13 +68,13 @@
       $(STRIP) generic

generic.b: generic
-       $(ELFTOAOUT) -o generic.b generic
+       $(OBJCOPY) -I elf32-sparc -O a.out-sunos-big generic generic.b
       echo -n 'SILO'$(IMGVERSION) | $(DD) of=generic.b bs=8 
conv=notrunc seek=3 count=1
       echo -n -e '\340' | $(DD) of=generic.b bs=1 count=1 seek=7 
conv=notrunc
       $(DD) if=/dev/zero of=generic.b bs=4 count=1 seek%5

fd.o: fd.S
-       $(CC) $(CFLAGS) -c -Wa,-Av9a fd.S
+       $(CC) $(CFLAGS) -Wa,-Av9a -c fd.S

fd: fd.o
       $(LD) $(LDFLAGS) -o fd fd.o
@@ -82,7 +82,7 @@
       $(STRIP) fd

fd.b: fd
-       $(ELFTOAOUT) -o fd.b fd
+       $(OBJCOPY) -I elf32-sparc -O a.out-sunos-big fd fd.b
       echo -n 'SILO'$(IMGVERSION) | $(DD) ofý.b bs=8 conv=notrunc 
seek=3 count=1
       echo -n -e '\340' | $(DD) ofý.b bs=1 count=1 seek=7 conv=notrunc
       $(DD) if=/dev/zero ofý.b bs=4 count=1 seek%5


-- 
----
Jim Gifford
maillist@jg555.com