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On Sat, 31 Jan 1998, John Breen wrote: ... > 1. In my previous uses, I ran into the problem of main calling __main, > which couldn't be found; since my code was very simple, I just stubbed > it out. I've now found that __main is in libgcc.a, but I have to > explicitly link to it. Is this right? Well it depends how your compiler is setup and if you link via the gcc front-end. If you use gcc to do the link then it will probably automatically add it in - use "gcc -v" to see how it calls the linker. Using gcc to invoke ld also means it will try and pickup a copy of libgcc compiled with the same compiler options (ie. -msoft-float). > > 2. Linking in libgcc then required _exit and _cleanup. I stubbed > _cleanup and made _exit an infinite loop. Does this make sense? Sounds reasonable to me. > > 3. I wanted to use rand() (I *believe* I'm using newlib-1.7.0). For > some reason, this requires sbrk(). I don't feel comfortable stubbing > this, but I considered just having it return -1 and setting errno to > ENOMEM (which the man page says it should do on error). Any ideas? I'm surprised here, because newlib-1.7.1/newlib/libc/stdlib/rand.c does appear to reference sbrk (or any other function). Try it and see!!! > > 4. I can't get SingleStep to recognize the debugging information. I > generate coff with -g, convert it to IEEE with objcopy, and then to > SDS's format with fromieee. But all I can display is disassembled code. > Anyone else have experience with SDS? (I did see a thread about this in > the archive, but it didn't look like it was completely answered; I'd > call SDS, but I imagine they'd just try to sell me their compiler). Well it works for me using gcc 2.7.2.x. BUT - I had to hack the compiler to build m68k-elf which generates ELF/DWARF files. If you are interested, I could email you my patches - they basically tweak the header files. > > 5. I've seen reference to remote debugging with gdb. Is this possible > via the BDM on the '360? Let me know if you get this working! I'm using SDS Singlestep over ethernet on a VME card, but our "real" targer just has a serial and BDM connector - currently using AMC BDM box (with lots of silly problems). > > Thanks. I'm sure I'll have more questions in the coming weeks. > -- > John A. Breen > jab3@hotmail.com > Good Luck Mark Phillips > > ______________________________________________________ > Get Your Private, Free Email at http://www.hotmail.com >