head -r333575's kernel: fails to boot old PowerMac G5 so-called "Quad Core", failing very early
Mark Millard via freebsd-ppc <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.ppc |
|---|---|
| Message-ID | <[email protected]> |
I'd had to revert to the old kernel from the last time I'd
updated the old PowerMac G5 "Quad Core" for powerpc64 style
use [back in early Jan.]:
# uname -apKU
FreeBSD FBSDG5L 12.0-CURRENT FreeBSD 12.0-CURRENT r327364M powerpc powerpc64 1200054 1200063
because buildkernel instalkernel for -r333575 results for
all the following fail in the same way:
A) devel/powerpc64-xtoolchain-gcc based build
(from /usr/ports/ -r469767 so before the upgrade to 6.4)
B) gcc 4.2.1 based build
C) system clang6 based build
These were all amd64 -> powerpc64 cross builds. Each is a
non-debug build --but with symbols.
The following 3 lines are displayed and nothing more
visible happens after that in the boot sequence, the
lines are the ones that start with:
GDB: no debug ports present
KDB: debugger backends:
KDB: current backend:
It does not display any Copyright notice line or even
clear the screen.
The old -r327364 kernel boots the old PowerMac G5 "Quad Core"
just fine (with the -r333575 world at this point).
So far, this much suggests the issue is not toolchain related,
although in all 3 cases devel/powerpc64-binutils is in use
so it can not be eliminated as easily.
[A problem is I'm very restricted on the amount of time
I can be involved in bisecting this and 333575-327364==6211
for the version span. Another problem is that, at the failure
stage, getting information about failure details is
problematical on the old PowerMac, even if I could apply
the time for such.]
For powerpc64 context I have:
# more /usr/src/sys/powerpc/conf/GENERIC64vtsc-NODBG
#
# GENERIC -- Custom configuration for the powerpc/powerpc64
#
include "GENERIC64"
ident GENERIC64vtsc-NODBG
makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols
nooptions PS3 # Sony Playstation 3 HACK!!! to allow sc
options KDB # Enable kernel debugger support
options ALT_BREAK_TO_DEBUGGER
options BREAK_TO_DEBUGGER
# For minimum debugger support (stable branch) use:
options KDB_TRACE # Print a stack trace for a panic
options DDB # Enable the kernel debugger
options GDB # HACK!!! ...
# Extra stuff:
#options VERBOSE_SYSINIT # Enable verbose sysinit messages
#options BOOTVERBOSE=1
#options BOOTHOWTO=RB_VERBOSE
#options KTR
#options KTR_MASK=KTR_TRAP
##options KTR_CPUMASK=0xF
#options KTR_VERBOSE
# HACK!!! to allow sc for 2560x1440 display on Radeon X1950 that vt historically mishandled during booting
device sc
#device kbdmux # HACK: already listed by vt
options SC_OFWFB # OFW frame buffer
options SC_DFLT_FONT # compile font in
makeoptions SC_DFLT_FONT=cp437
# Disable any extra checking for. . .
nooptions DEADLKRES # Enable the deadlock resolver
nooptions INVARIANTS # Enable calls of extra sanity checking
nooptions INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS
nooptions WITNESS # Enable checks to detect deadlocks and cycles
nooptions WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed
nooptions DIAGNOSTIC
nooptions MALLOC_DEBUG_MAXZONES # Separate malloc(9) zones
device filemon
device geom_label
# svnlite diff /usr/src/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
Index: /usr/src/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
===================================================================
--- /usr/src/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp (revision 333575)
+++ /usr/src/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp (working copy)
@@ -1176,7 +1176,7 @@
// For SVR4, don't emit a move for the CR spill slot if we haven't
// spilled CRs.
if (isSVR4ABI && (PPC::CR2 <= Reg && Reg <= PPC::CR4)
- && !MustSaveCR)
+ && (!MustSaveCR && isPPC64))
continue;
// For 64-bit SVR4 when we have spilled CRs, the spill location
Note: The following file does not intend a powerpc64 functional change
but a powerpc (32-bit) change:
# svnlite diff /usr/src/sys/powerpc/ofw/ofw_machdep.c
Index: /usr/src/sys/powerpc/ofw/ofw_machdep.c
===================================================================
--- /usr/src/sys/powerpc/ofw/ofw_machdep.c (revision 333575)
+++ /usr/src/sys/powerpc/ofw/ofw_machdep.c (working copy)
@@ -116,26 +116,27 @@
* Assume that interrupt are disabled at this point, or
* SPRG1-3 could be trashed
*/
-#ifdef __powerpc64__
- __asm __volatile("mtsprg1 %0\n\t"
- "mtsprg2 %1\n\t"
- "mtsprg3 %2\n\t"
- :
- : "r"(ofmsr[2]),
- "r"(ofmsr[3]),
- "r"(ofmsr[4]));
-#else
- __asm __volatile("mfsprg0 %0\n\t"
- "mtsprg0 %1\n\t"
- "mtsprg1 %2\n\t"
- "mtsprg2 %3\n\t"
- "mtsprg3 %4\n\t"
- : "=&r"(ofw_sprg0_save)
- : "r"(ofmsr[1]),
- "r"(ofmsr[2]),
- "r"(ofmsr[3]),
- "r"(ofmsr[4]));
+#ifndef __powerpc64__
+ if (!(cpu_features & PPC_FEATURE_64))
+ __asm __volatile("mfsprg0 %0\n\t"
+ "mtsprg0 %1\n\t"
+ "mtsprg1 %2\n\t"
+ "mtsprg2 %3\n\t"
+ "mtsprg3 %4\n\t"
+ : "=&r"(ofw_sprg0_save)
+ : "r"(ofmsr[1]),
+ "r"(ofmsr[2]),
+ "r"(ofmsr[3]),
+ "r"(ofmsr[4]));
+ else
#endif
+ __asm __volatile("mtsprg1 %0\n\t"
+ "mtsprg2 %1\n\t"
+ "mtsprg3 %2\n\t"
+ :
+ : "r"(ofmsr[2]),
+ "r"(ofmsr[3]),
+ "r"(ofmsr[4]));
}
static __inline void
@@ -152,7 +153,8 @@
* PCPU data cannot be used until this routine is called !
*/
#ifndef __powerpc64__
- __asm __volatile("mtsprg0 %0" :: "r"(ofw_sprg0_save));
+ if (!(cpu_features & PPC_FEATURE_64))
+ __asm __volatile("mtsprg0 %0" :: "r"(ofw_sprg0_save));
#endif
}
#endif
Note: The following file's change is actually for
!defined(__powerpc64__) added code . . .
# svnlite diff /usr/src/sys/powerpc/aim/mmu_oea64.c
Index: /usr/src/sys/powerpc/aim/mmu_oea64.c
===================================================================
--- /usr/src/sys/powerpc/aim/mmu_oea64.c (revision 333575)
+++ /usr/src/sys/powerpc/aim/mmu_oea64.c (working copy)
@@ -1820,6 +1820,18 @@
PV_PAGE_UNLOCK(m);
}
+#if defined(AIM) && !defined(__powerpc64__)
+//
+// Part of PowerMac G5 HACK FOR PROBLEM FINDING. . .
+// (G5 used via 32-bit FreeBSD.)
+//
+
+extern char _GOT_START_[]; // beginning of .got/.got.plt
+extern char _GOT_END_[]; // ending of .got/.got.plt
+
+extern vm_offset_t __startkernel, __endkernel;
+#endif
+
/*
* Map a wired page into kernel virtual address space.
*/
@@ -1830,6 +1842,52 @@
struct pvo_entry *pvo, *oldpvo;
pvo = alloc_pvo_entry(0);
+#if defined(AIM) && !defined(__powerpc64__)
+ //
+ // PowerMac G5 HACK FOR PROBLEM FINDING. . .
+ // (G5 used via 32-bit FreeBSD.)
+ //
+ // As a problem-finding-aid try to catch some examples of
+ // jumping to non-code in the kernel before it tries to
+ // execute that that code. Hopefully this will show where
+ // the bad jump into the likes of the .hash section is
+ // happening. (dbb bt and vmcore.*'s have not lead to
+ // that information so far.)
+ //
+ if (cpu_features & PPC_FEATURE_64)
+ {
+ // First deal with pages that should have the original
+ // VM_PROT_EXECUTE status for something on the page
+ // (most pages in the kernel area). So pages with some
+ // byte(s) from .text, .got, or .got.plt, along with
+ // any requested from before where __startkernel
+ // indicates. Also any va requested from a page
+ // containing where __endkernel indicates or later
+ // gets VM_PROT_EXECUTE if such a va is requested.
+ //
+ // So: have just the rest of the kernel area not have
+ // VM_PROT_EXECUTE status in hopes that it will report
+ // where the code is that is making bad jumps to
+ // non-code, such as jumping into the .hash section
+ // instead of reporting on illegal instructions
+ // from the incorrect traget area.
+ //
+ if ( va < ((vm_offset_t)(etext+(PAGE_SIZE-1)) & ~PAGE_MASK) )
+ pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
+
+ else if ( ((vm_offset_t)_GOT_START_ & ~PAGE_MASK) <= va
+ && va < ((vm_offset_t)(_GOT_END_+(PAGE_SIZE-1)) & ~PAGE_MASK)
+ )
+ pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
+
+ else if ( va < (__endkernel & ~PAGE_MASK) )
+ pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE;
+
+ else // Otherwise do as before the HACK:
+ pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
+ }
+ else
+#endif
pvo->pvo_pte.prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
pvo->pvo_pte.pa = (pa & ~ADDR_POFF) | moea64_calc_wimg(pa, ma);
pvo->pvo_vaddr |= PVO_WIRED;
Note: The following should not matter because it is only for
devel/powerpc64-gcc but gcc 4.2.1 and system clang6 got the
same result:
# svnlite diff /usr/ports/devel/powerpc64-gcc/Makefile
Index: /usr/ports/devel/powerpc64-gcc/Makefile
===================================================================
--- /usr/ports/devel/powerpc64-gcc/Makefile (revision 469767)
+++ /usr/ports/devel/powerpc64-gcc/Makefile (working copy)
@@ -2,7 +2,7 @@
PORTNAME= gcc
PORTVERSION= 6.3.0
-PORTREVISION= 5
+PORTREVISION= 6
CATEGORIES= devel
MASTER_SITES= GCC/releases/gcc-${DISTVERSION}
PKGNAMEPREFIX?= powerpc64-
@@ -42,6 +42,7 @@
GNU_CONFIGURE= yes
CONFIGURE_OUTSOURCE= yes
CONFIGURE_ARGS+=--target=${GCC_TARGET} --disable-nls --enable-languages=c,c++ \
+ --enable-gnu-indirect-function \
--without-headers \
--with-gmp=${LOCALBASE} \
--with-pkgversion="FreeBSD Ports Collection for ${PKGNAMEPREFIX:C/-//g}" \
@@ -104,6 +105,6 @@
# This port and all its slave ports fail on aarch64 -- but not all
# the same way. Provide this definition for the master.
-BROKEN_aarch64?= fails to package
+#BROKEN_aarch64?= fails to package
.include <bsd.port.post.mk>
===
Mark Millard
marklmi26-fbsd at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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