+ /* FIXME: However, I'm not convinced that the values that Linux
+ puts in this slot are actually right; specifically, attempting
+ to compile sbcl with sbcl-0.7.7.7 lead to an "infinite SIGTRAP
+ loop" where a (BREAK 16) not in a branch delay slot would have
+ CAUSEF_BD filled. So, we comment
+
+ return (((struct sigcontext *) &(context->uc_mcontext))->sc_cause
+ & CAUSEF_BD);
+
+ out and return 0 always. -- CSR, 2002-09-02 */
+ /* Unfortunately, returning 0 fails for taken branches because
+ os_context_bd_cause is also used to find out if a branch
+ emulation is needed. We work around that by checking if the
+ current instruction is a jump or a branch. */
+ extern boolean arch_insn_with_bdelay_p(unsigned int insn);
+
+ os_vm_address_t addr
+ = (os_vm_address_t)(unsigned int)*os_context_pc_addr(context);
+ unsigned int insn = *(unsigned int *)addr;
+
+ if (arch_insn_with_bdelay_p(insn))
+ return CAUSEF_BD;
+
+ return 0;