1 ;;; This file contains the MIPS specific runtime stuff.
6 (define-alien-type os-context-t (struct os-context-t-struct))
7 (define-alien-type os-context-register-t unsigned-long-long)
12 (defun machine-type ()
13 "Returns a string describing the type of the local machine."
16 ;;;; FIXUP-CODE-OBJECT
18 (defun fixup-code-object (code offset value kind)
19 (declare (type index offset))
20 (unless (zerop (rem offset n-word-bytes))
21 (error "Unaligned instruction? offset=#x~X." offset))
23 (let ((sap (%primitive sb!c::code-instructions code)))
26 (aver (zerop (ash value -28)))
27 (setf (ldb (byte 26 0) (sap-ref-32 sap offset))
30 (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
31 (ash (1+ (ash value -15)) -1)))
33 (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
34 (ldb (byte 16 0) value)))))))
37 (define-alien-routine ("os_context_pc_addr" context-pc-addr)
38 (* os-context-register-t)
39 (context (* os-context-t) :in))
41 (defun context-pc (context)
42 (declare (type (alien (* os-context-t)) context))
43 (int-sap (deref (context-pc-addr context))))
45 (define-alien-routine ("os_context_register_addr" context-register-addr)
46 (* os-context-register-t)
47 (context (* os-context-t) :in)
50 (define-alien-routine ("os_context_bd_cause" context-bd-cause-int)
52 (context (* os-context-t) :in))
54 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
55 ;;; (Are they used in anything time-critical, or just the debugger?)
56 (defun context-register (context index)
57 (declare (type (alien (* os-context-t)) context))
58 (let ((addr (context-register-addr context index)))
59 (declare (type (alien (* os-context-register-t)) addr))
62 (defun %set-context-register (context index new)
63 (declare (type (alien (* os-context-t)) context))
64 (let ((addr (context-register-addr context index)))
65 (declare (type (alien (* os-context-register-t)) addr))
66 (setf (deref addr) new)))
68 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
69 ;;; register. FORMAT is the type of float to return.
71 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
72 ;;; long is another question. This stuff still needs testing.
73 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
74 (* os-context-register-t)
75 (context (* os-context-t) :in)
78 (defun context-float-register (context index format)
79 (declare (type (alien (* os-context-t)) context))
80 (let ((addr (context-float-register-addr context index)))
81 (declare (type (alien (* os-context-register-t)) addr))
82 (coerce (deref addr) format)))
84 (defun %set-context-float-register (context index format new)
85 (declare (type (alien (* os-context-t)) context))
86 (let ((addr (context-float-register-addr context index)))
87 (declare (type (alien (* os-context-register-t)) addr))
88 (setf (deref addr) (coerce new format))))
91 ("arch_get_fp_control" floating-point-modes) unsigned-int)
94 ("arch_set_fp_control" %floating-point-modes-setter) void (fp unsigned-int :in))
96 (defun (setf floating-point-modes) (val) (%floating-point-modes-setter val))
98 ;;; Given a signal context, return the floating point modes word in
99 ;;; the same format as returned by FLOATING-POINT-MODES.
100 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
102 (context (* os-context-t) :in))
104 ;;;; Internal-error-arguments.
106 ;;; INTERNAL-ERROR-ARGUMENTS -- interface.
108 ;;; Given the sigcontext, extract the internal error arguments from the
109 ;;; instruction stream. This is e.g.
110 ;;; 4 23 254 206 1 0 0 0
111 ;;; | ~~~~~~~~~~~~~~~~~~~~~~~~~
112 ;;; length data (everything is an octet)
114 (defun internal-error-args (context)
115 (declare (type (alien (* os-context-t)) context))
116 (/show0 "entering INTERNAL-ERROR-ARGS, CONTEXT=..")
118 (let ((pc (context-pc context))
119 (cause (context-bd-cause-int context)))
120 (declare (type system-area-pointer pc))
121 (multiple-value-bind (error-number length sc-offsets)
122 ;; KLUDGE: This exposure of the branch delay mechanism hurts.
123 (snarf-error-junk pc (if (logbitp 31 cause) 8 4))
124 (declare (ignore length))
125 (values error-number sc-offsets))))