lowlevel-68000: fixes for signals

Synchronous signal traps don't yet work but this takes us one step closer

diff --git a/Kernel/lowlevel-68000.S b/Kernel/lowlevel-68000.S
index 9b5d23b..550e57c 100644 (file)
--- a/Kernel/lowlevel-68000.S
+++ b/Kernel/lowlevel-68000.S
@@ -498,6 +498,7 @@ trap14:             move.l a5,-(sp)
                bsr unix_syscall
                or.w #$0700,sr
                clr.b U_DATA__U_INSYS(a5)
+               clr.b kernel_flag
                ; Now we need to be careful. We can make a syscall in a
                ; signal handler and we must not screw up the return from
                ; this call
@@ -635,6 +636,12 @@ intvector7:        movem.l a0-a6/d0-d7,-(sp)
                movem.l (sp)+,a0-a6/d0-d7
                rte
 #endif
+;
+;      FIXME:
+;      Use the trap frame not flags to test this (exception from supervisor
+;      means bad). Also we need to work out the frame size and move it to
+;      the user stack with a signal to help debuggers.
+;
 sig_or_die:    
                tst.b kernel_flag
                beq sig_user
@@ -666,7 +673,8 @@ sig_user:   movem.l a0-a1/a5/d0-d1,-(sp)
                move.l U_DATA__U_PTAB(a5),-(sp)
                bsr ssig
                adda #4,sp
-               ; Do signal processing bit here if we return
+               ; FIXME: we need to do signal processing
+               ;  here if we return
                movem.l (sp)+,a0-a1/a5/d0-d1
                adda #4,sp
                rte