extern void arch_skip_instruction(os_context_t*);
extern boolean arch_pseudo_atomic_atomic(os_context_t*);
extern void arch_set_pseudo_atomic_interrupted(os_context_t*);
extern os_vm_address_t arch_get_bad_addr(int, siginfo_t*, os_context_t*);
extern unsigned char *arch_internal_error_arguments(os_context_t*);
extern void arch_skip_instruction(os_context_t*);
extern boolean arch_pseudo_atomic_atomic(os_context_t*);
extern void arch_set_pseudo_atomic_interrupted(os_context_t*);
extern os_vm_address_t arch_get_bad_addr(int, siginfo_t*, os_context_t*);
extern unsigned char *arch_internal_error_arguments(os_context_t*);
-extern unsigned long arch_install_breakpoint(void *pc);
-extern void arch_remove_breakpoint(void *pc, unsigned long orig_inst);
+extern unsigned int arch_install_breakpoint(void *pc);
+extern void arch_remove_breakpoint(void *pc, unsigned int orig_inst);
extern void arch_install_interrupt_handlers(void);
extern void arch_do_displaced_inst(os_context_t *context,
extern void arch_install_interrupt_handlers(void);
extern void arch_do_displaced_inst(os_context_t *context,
extern lispobj funcall0(lispobj function);
extern lispobj funcall1(lispobj function, lispobj arg0);
extern lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1);
extern lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1,
extern lispobj funcall0(lispobj function);
extern lispobj funcall1(lispobj function, lispobj arg0);
extern lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1);
extern lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1,