Author: agraf Date: Thu May 29 00:15:33 2014 New Revision: 1305 URL: http://tracker.coreboot.org/trac/openbios/changeset/1305
Log: arch/ppc/qemu: Moved exception handlers from beginning of RAM
Do not put exception handler routines between 0x00-0xff as some OSes use this area for their own purposes and can corrupt them. (In particular MorphOS writes to 0x80 during boot). This patch frees up this area by moving the routines that were there higher.
Signed-off-by: BALATON Zoltan balaton@eik.bme.hu Signed-off-by: Alexander Graf agraf@suse.de
Modified: trunk/openbios-devel/arch/ppc/qemu/start.S
Modified: trunk/openbios-devel/arch/ppc/qemu/start.S ============================================================================== --- trunk/openbios-devel/arch/ppc/qemu/start.S Sun May 25 11:50:05 2014 (r1304) +++ trunk/openbios-devel/arch/ppc/qemu/start.S Thu May 29 00:15:33 2014 (r1305) @@ -280,20 +280,8 @@ 1: nop // b 1b
-call_dsi_exception: - LOAD_REG_FUNC(r3, dsi_exception) - mtctr r3 - bctrl - b exception_return - -call_isi_exception: - LOAD_REG_FUNC(r3, isi_exception) - mtctr r3 - bctrl - b exception_return - -exception_return: - EXCEPTION_EPILOGUE +VECTOR( 0x100, "SRE" ): + b _entry
trap_error: lis r1, 0x8000 /* r1=0x80000000 */ @@ -309,9 +297,6 @@ mtctr r4 bctr
-VECTOR( 0x100, "SRE" ): - b _entry - ILLEGAL_VECTOR( 0x200 )
VECTOR( 0x300, "DSI" ): @@ -373,11 +358,20 @@
real_dsi: EXCEPTION_PREAMBLE - b call_dsi_exception + LOAD_REG_FUNC(r3, dsi_exception) + mtctr r3 + bctrl + b exception_return
real_isi: EXCEPTION_PREAMBLE - b call_isi_exception + LOAD_REG_FUNC(r3, isi_exception) + mtctr r3 + bctrl + b exception_return + +exception_return: + EXCEPTION_EPILOGUE
GLOBL(__vectors_end):