Date: Fri, 19 Jul 2002 17:10:11 +1000 From: Peter Grehan <peterg@ptree32.com.au> To: freebsd-ppc@FreeBSD.ORG Subject: Re: success level with peter g's patch.. Message-ID: <3D37BB53.D5486D0B@ptree32.com.au> References: <1027050508.3d378c0c98e84@www.wantpackets.com>
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Hi Andy,
Good to see you get this far. I've just tracked down a problem with the
setting up of argc/argv - the values in setreg() were being overwritten
by syscall(), so I worked around that in setreg(). The correct solution
I believe is for execve() to return EJUSTRETURN, as NetBSD does. Patch at end.
> init died (signal 6, exit 0)
> panic: Going nowhere without my init!
First, try the patch, and then, start working towards where things go
wrong by enabling trap tracing and setting a breakpoint in panic(). Init
is quite a small program, so you can even set breakpoints in syscall() and
follow the program flow.
later,
Peter.
powerpc/powerpc/machdep.c
***************
*** 875,882 ****
--- 875,893 ----
* XXX We have to set both regs and retval here due to different
* XXX calling convention in trap.c and init_main.c.
*/
+
+ /*
+ * XXX PG: these get overwritten in the syscall return code.
+ * execve() should return EJUSTRETURN, like it does on NetBSD.
+ * Emulate by setting the syscall return value cells
+ */
+ #if 0
tf->fixreg[3] = arginfo.ps_nargvstr;
tf->fixreg[4] = (register_t)arginfo.ps_argvstr;
+ #else
+ td->td_retval[0] = arginfo.ps_nargvstr;
+ td->td_retval[1] = (register_t)arginfo.ps_argvstr;
+ #endif
tf->fixreg[5] = (register_t)arginfo.ps_envstr;
tf->fixreg[6] = 0; /* auxillary vector */
tf->fixreg[7] = 0; /* termination vector */
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