Date: Sat, 20 Mar 2004 20:51:28 -0800 (PST) From: Juli Mallett <jmallett@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 49432 for review Message-ID: <200403210451.i2L4pSlu063435@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=49432 Change 49432 by jmallett@jmallett_oingo on 2004/03/20 20:50:51 Stay kernel mode without exceptions through exception processing. Affected files ... .. //depot/projects/mips/sys/mips/mips/exception.S#24 edit Differences ... ==== //depot/projects/mips/sys/mips/mips/exception.S#24 (text+ko) ==== @@ -23,7 +23,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $P4: //depot/projects/mips/sys/mips/mips/exception.S#23 $ + * $P4: //depot/projects/mips/sys/mips/mips/exception.S#24 $ */ #include "opt_ddb.h" @@ -121,19 +121,31 @@ jal save_kdbaux nop #endif /* DDB */ + li t0, MIPS_SR_KX + mtc0 t0, MIPS_COP_0_STATUS /* * Call trap() with arguments: * trapframe, cause, badvaddr. * * The trapframe is copied from k1 to a0 in the BDslot. + * + * trap returns the frame. */ mfc0 a1, MIPS_COP_0_CAUSE dmfc0 a2, MIPS_COP_0_BAD_VADDR jal trap move a0, k1 - move k1, sp + /* + * Make sure interrupts are disabled for the purposes of + * having a clean go at restoring. + */ + mtc0 zero, MIPS_COP_0_CAUSE + li t0, MIPS_SR_KX + mtc0 t0, MIPS_COP_0_STATUS + + move k1, v0 jal exception_restore_registers nop daddu sp, sp, TF_SIZE
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