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| author | James Hogan <james.hogan@imgtec.com> | 2012-10-09 10:54:43 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:09:45 +0000 |
| commit | ac919f0883e53d7785745566692c8a0620abd7ea (patch) | |
| tree | 521a0b0ddcab5176a1998d0b7b9faefde6e3f0ae /arch/metag/kernel/tbiunexp.S | |
| parent | a2c5d4ed92bbc02ff4a37efc2adffe7d145abe4f (diff) | |
| download | linux-ac919f0883e53d7785745566692c8a0620abd7ea.tar.gz linux-ac919f0883e53d7785745566692c8a0620abd7ea.tar.xz | |
metag: Traps
Add trap code for metag. At the lowest level Meta traps (and return from
interrupt instruction - RTI) simply swap the PC and PCX registers and
optionally toggle the interrupt status bit (ISTAT). Low level TBX code
in tbipcx.S handles the core context save, determine the TBX signal
number based on the core trigger that fired (using the TXSTATI status
register), and call TBX signal handlers (mostly in traps.c) via a vector
table.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/metag/kernel/tbiunexp.S')
| -rw-r--r-- | arch/metag/kernel/tbiunexp.S | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/metag/kernel/tbiunexp.S b/arch/metag/kernel/tbiunexp.S new file mode 100644 index 000000000000..907bbe0b2e68 --- /dev/null +++ b/arch/metag/kernel/tbiunexp.S @@ -0,0 +1,22 @@ +/* Pass a breakpoint through to Codescape */ + +#include <asm/tbx.h> + + .text + .global ___TBIUnExpXXX + .type ___TBIUnExpXXX,function +___TBIUnExpXXX: + TSTT D0Ar2,#TBICTX_CRIT_BIT ! Result of nestable int call? + BZ $LTBINormCase ! UnExpXXX at background level + MOV D0Re0,TXMASKI ! Read TXMASKI + XOR TXMASKI,D1Re0,D1Re0 ! Turn off BGNDHALT handling! + OR D0Ar2,D0Ar2,D0Re0 ! Preserve bits cleared +$LTBINormCase: + MSETL [A0StP],D0Ar6,D0Ar4,D0Ar2 ! Save args on stack + SETL [A0StP++],D0Ar2,D1Ar1 ! Init area for returned values + SWITCH #0xC20208 ! Total stack frame size 8 Dwords + ! write back size 2 Dwords + GETL D0Re0,D1Re0,[--A0StP] ! Get result + SUB A0StP,A0StP,#(8*3) ! Recover stack frame + MOV PC,D1RtP + .size ___TBIUnExpXXX,.-___TBIUnExpXXX |