On Sat, 3 May 2008, Brad Parker wrote: We may not need mount afterall. The init process mounts /dev/rk0 on /usr during startup (after the second "1:" label on e12-01). Btw, how does one manipulate the consoel switches in simh? The init process goes into single user mode (top of init on e12-01) if the console switches are set appropriately.. I've stepped through this code to verify that it is not doing that with our config (if it was, it should go straight to shell with no login prompt). Tim Newsham http://www.thenewsh.com/~newsham/

On Sat, May 03, 2008 at 10:35:47AM -0400, Brad Parker wrote: I think getting the V1 kernel to grok 0407 a.outs should be easier. Here are snippets from the V1 and V2 a.out man pages: 1st Edition 2nd Edition ----------- ----------- The header always contains 6 words: The header always contains 8 words: 1 a "br .+14" instruction [205(8)] 1 a "br .+20" instruction [207(8)] 2 the size of the program text 2 the size of the program text 3 the size of the symbol table 3 the size of the initialised data 4 the size of the relocation bits area 4 the size of the uninit (bss) data 5 the size of a data area 5 the size of the symbol table 6 a zero word, unused at present 6 the entry location, always 0 7 stack size required, always 0 8 a flag indicating relocation bits have been suppressed When I wrote the Apout support for V1 and V2, I found that all of an 0405 a.out was loaded into memory including the header, but the 0407 a.out is loaded into memory MINUS the 8-word header. So, I'm guessing, in the kernel's sysexec: code, where it does cmp core,$405 / br .+14 is first instruction if file is / standard a.out format we have to add a section that recognises 0407, adds up the size of text, data and bss (words 2, 3, 4), saves that in u.count, and loads the rest of the a.out into memory but with the 8-word header removed. Cheers, Warren