Date: Sun, 27 May 2001 13:01:46 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: John Baldwin <jhb@FreeBSD.ORG> Cc: alpha@FreeBSD.ORG Subject: Re: HEADS UP: loader broken Message-ID: <15121.13050.442921.467470@grasshopper.cs.duke.edu> In-Reply-To: <XFMail.010525163719.jhb@FreeBSD.org> References: <XFMail.010525163719.jhb@FreeBSD.org>
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I'd suggest anybody in a position to debug this apply the following
patch to main.c that I got from DFR a few months back. It sets up
a trap handler which halts the machine. You'll need to grab
the SP from the SRM console & manually grovel through it for PS, PC,
GP, A0, A1, A2.
Eg:
>>>e sp
gpr: 1E ( R30) 0000000020045D30
You'd then do:
>>> e -n 6 20045d30
to get PS, PC, GP, A0, A1, A2
Drew
Index: alpha/common/main.c
===================================================================
RCS file: /home/ncvs/src/sys/boot/alpha/common/main.c,v
retrieving revision 1.13
diff -u -r1.13 main.c
--- alpha/common/main.c 2000/10/25 23:36:01 1.13
+++ alpha/common/main.c 2000/10/26 23:13:07
@@ -108,6 +108,24 @@
}
}
+static void
+entMM(u_int64_t a0, u_int64_t a1, u_int64_t a2)
+{
+ alpha_pal_halt();
+}
+
+static void
+setup_kgp()
+{
+ register u_int64_t gp __asm__("$29");
+ register u_int64_t a0 __asm__("$16") = gp;
+ __asm__ __volatile__ (
+ "call_pal 0x37 #PAL_OSF1_wrkgp"
+ : "=r" (a0)
+ : "0" (a0)
+ : "$1", "$22", "$23", "$24", "$25");
+}
+
int
main(void)
{
@@ -140,6 +158,10 @@
/* switch to OSF pal code. */
OSFpal();
+
+ setup_kgp();
+ alpha_pal_wrent(entMM, ALPHA_KENTRY_MM);
+
/*
* Initialise the block cache
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