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powerpc: Fix COFF zImage booting on old powermacs 

Commit 6975a783d7 ("powerpc/boot: Allow building the zImage wrapper
as a relocatable ET_DYN", 2011-04-12) changed the procedure descriptor
at the start of crt0.S to have a hard-coded start address of 0x500000
rather than a reference to _zimage_start, presumably because having
a reference to a symbol introduced a relocation which is awkward to
handle in a position-independent executable.  Unfortunately, what is
at 0x500000 in the COFF image is not the first instruction, but the
procedure descriptor itself, that is, a word containing 0x500000,
which is not a valid instruction.  Hence, booting a COFF zImage
results in a "DEFAULT CATCH!, code=FFF00700" message from Open
Firmware.

This fixes the problem by (a) putting the procedure descriptor in the
data section and (b) adding a branch to _zimage_start as the first
instruction in the program.

Fixes: 6975a783d7 ("powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYN")
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras 2018-11-27 09:01:54 +11:00 committed by Michael Ellerman
parent b2fed34a62
commit 5564597d51
1 changed files with 3 additions and 1 deletions
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4
arch/powerpc/boot/crt0.S
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@ -15,7 +15,7 @@
RELA = 7
RELACOUNT = 0x6ffffff9
.text
.data
/* A procedure descriptor used when booting this as a COFF file.
* When making COFF, this comes first in the link and we're
* linked at 0x500000.
@ -23,6 +23,8 @@ RELACOUNT = 0x6ffffff9
.globl _zimage_start_opd
_zimage_start_opd:
.long 0x500000, 0, 0, 0
.text
b _zimage_start
#ifdef __powerpc64__
.balign 8