1 ;;;; the definition of non-local exit for the x86 VM
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
14 ;;; Make an environment-live stack TN for saving the SP for NLX entry.
15 (!def-vm-support-routine make-nlx-sp-tn (env)
17 (make-representation-tn *fixnum-primitive-type* any-reg-sc-number)
20 ;;; Make a TN for the argument count passing location for a non-local entry.
21 (!def-vm-support-routine make-nlx-entry-arg-start-location ()
22 (make-wired-tn *fixnum-primitive-type* any-reg-sc-number ebx-offset))
24 (defun catch-block-ea (tn)
25 (aver (sc-is tn catch-block))
26 (make-ea :dword :base ebp-tn
27 :disp (frame-byte-offset (+ -1 (tn-offset tn) catch-block-size))))
30 ;;;; Save and restore dynamic environment.
32 ;;;; These VOPs are used in the reentered function to restore the
33 ;;;; appropriate dynamic environment. Currently we only save the
34 ;;;; Current-Catch and the alien stack pointer. (Before sbcl-0.7.0,
35 ;;;; when there were IR1 and byte interpreters, we had to save
36 ;;;; the interpreter "eval stack" too.)
38 ;;;; We don't need to save/restore the current UNWIND-PROTECT, since
39 ;;;; UNWIND-PROTECTs are implicitly processed during unwinding.
41 ;;;; We don't need to save the BSP, because that is handled automatically.
43 (define-vop (save-dynamic-state)
44 (:results (catch :scs (descriptor-reg))
45 (alien-stack :scs (descriptor-reg)))
47 (load-tl-symbol-value catch *current-catch-block*)
48 (load-tl-symbol-value alien-stack *alien-stack*)))
50 (define-vop (restore-dynamic-state)
51 (:args (catch :scs (descriptor-reg))
52 (alien-stack :scs (descriptor-reg)))
53 #!+sb-thread (:temporary (:sc unsigned-reg) temp)
55 (store-tl-symbol-value catch *current-catch-block* temp)
56 (store-tl-symbol-value alien-stack *alien-stack* temp)))
58 (define-vop (current-stack-pointer)
59 (:results (res :scs (any-reg control-stack)))
63 (define-vop (current-binding-pointer)
64 (:results (res :scs (any-reg descriptor-reg)))
66 (load-binding-stack-pointer res)))
68 ;;;; unwind block hackery
70 ;;; Compute the address of the catch block from its TN, then store into the
71 ;;; block the current Fp, Env, Unwind-Protect, and the entry PC.
72 (define-vop (make-unwind-block)
75 (:temporary (:sc unsigned-reg) temp)
76 (:results (block :scs (any-reg)))
78 (inst lea block (catch-block-ea tn))
79 (load-tl-symbol-value temp *current-unwind-protect-block*)
80 (storew temp block unwind-block-current-uwp-slot)
81 (storew ebp-tn block unwind-block-current-cont-slot)
82 (storew (make-fixup nil :code-object entry-label)
83 block catch-block-entry-pc-slot)
86 (inst fs-segment-prefix)
87 (inst mov temp (make-ea :dword :disp 0))
88 (storew temp block unwind-block-next-seh-frame-slot))))
90 ;;; like MAKE-UNWIND-BLOCK, except that we also store in the specified
91 ;;; tag, and link the block into the CURRENT-CATCH list
92 (define-vop (make-catch-block)
94 (tag :scs (any-reg descriptor-reg) :to (:result 1)))
96 (:results (block :scs (any-reg)))
97 (:temporary (:sc descriptor-reg) temp)
99 (inst lea block (catch-block-ea tn))
100 (load-tl-symbol-value temp *current-unwind-protect-block*)
101 (storew temp block unwind-block-current-uwp-slot)
102 (storew ebp-tn block unwind-block-current-cont-slot)
103 (storew (make-fixup nil :code-object entry-label)
104 block catch-block-entry-pc-slot)
107 (inst fs-segment-prefix)
108 (inst mov temp (make-ea :dword :disp 0))
109 (storew temp block unwind-block-next-seh-frame-slot))
110 (storew tag block catch-block-tag-slot)
111 (load-tl-symbol-value temp *current-catch-block*)
112 (storew temp block catch-block-previous-catch-slot)
113 (store-tl-symbol-value block *current-catch-block* temp)))
115 ;;; Just set the current unwind-protect to TN's address. This instantiates an
116 ;;; unwind block as an unwind-protect.
117 (define-vop (set-unwind-protect)
119 (:temporary (:sc unsigned-reg) new-uwp #!+sb-thread tls #!+win32 seh-frame)
121 (inst lea new-uwp (catch-block-ea tn))
124 (storew (make-fixup 'uwp-seh-handler :assembly-routine)
125 new-uwp unwind-block-seh-frame-handler-slot)
127 (make-ea-for-object-slot new-uwp
128 unwind-block-next-seh-frame-slot 0))
129 (inst fs-segment-prefix)
130 (inst mov (make-ea :dword :disp 0) seh-frame))
131 (store-tl-symbol-value new-uwp *current-unwind-protect-block* tls)))
133 (define-vop (unlink-catch-block)
134 (:temporary (:sc unsigned-reg) #!+sb-thread tls block)
136 (:translate %catch-breakup)
138 (load-tl-symbol-value block *current-catch-block*)
139 (loadw block block catch-block-previous-catch-slot)
140 (store-tl-symbol-value block *current-catch-block* tls)))
142 (define-vop (unlink-unwind-protect)
143 ;; NOTE: When we have both #!+sb-thread and #!+win32, we only need one temp
144 (:temporary (:sc unsigned-reg) block #!+sb-thread tls #!+win32 seh-frame)
146 (:translate %unwind-protect-breakup)
148 (load-tl-symbol-value block *current-unwind-protect-block*)
151 (loadw seh-frame block unwind-block-next-seh-frame-slot)
152 (inst fs-segment-prefix)
153 (inst mov (make-ea :dword :disp 0) seh-frame))
154 (loadw block block unwind-block-current-uwp-slot)
155 (store-tl-symbol-value block *current-unwind-protect-block* tls)))
158 (define-vop (nlx-entry)
159 ;; Note: we can't list an sc-restriction, 'cause any load vops would
160 ;; be inserted before the return-pc label.
164 (:results (values :more t))
165 (:temporary (:sc descriptor-reg) move-temp)
167 (:save-p :force-to-stack)
171 (note-this-location vop :non-local-entry)
172 (cond ((zerop nvals))
174 (let ((no-values (gen-label)))
175 (inst mov (tn-ref-tn values) nil-value)
176 (inst jecxz no-values)
177 (loadw (tn-ref-tn values) start -1)
178 (emit-label no-values)))
180 (collect ((defaults))
182 (tn-ref values (tn-ref-across tn-ref)))
184 (let ((default-lab (gen-label))
185 (tn (tn-ref-tn tn-ref)))
186 (defaults (cons default-lab tn))
188 (inst cmp count (fixnumize i))
189 (inst jmp :le default-lab)
191 ((descriptor-reg any-reg)
192 (loadw tn start (frame-word-offset i)))
194 (loadw move-temp start (frame-word-offset i))
195 (inst mov tn move-temp)))))
196 (let ((defaulting-done (gen-label)))
197 (emit-label defaulting-done)
198 (assemble (*elsewhere*)
199 (dolist (def (defaults))
200 (emit-label (car def))
201 (inst mov (cdr def) nil-value))
202 (inst jmp defaulting-done))))))
203 (inst mov esp-tn sp)))
205 (define-vop (nlx-entry-multiple)
209 ;; Again, no SC restrictions for the args, 'cause the loading would
210 ;; happen before the entry label.
212 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 2)) ecx)
213 (:temporary (:sc unsigned-reg :offset esi-offset) esi)
214 (:temporary (:sc unsigned-reg :offset edi-offset) edi)
215 (:results (result :scs (any-reg) :from (:argument 0))
216 (num :scs (any-reg control-stack)))
217 (:save-p :force-to-stack)
221 (note-this-location vop :non-local-entry)
223 (inst lea esi (make-ea :dword :base source :disp (- n-word-bytes)))
224 ;; The 'top' arg contains the %esp value saved at the time the
225 ;; catch block was created and points to where the thrown values
230 (inst sub edi n-word-bytes)
231 (move ecx count) ; fixnum words == bytes
233 (inst shr ecx word-shift) ; word count for <rep movs>
234 ;; If we got zero, we be done.
242 ;; solaris requires DF being zero.
244 ;; Reset the CSP at last moved arg.
245 (inst lea esp-tn (make-ea :dword :base edi :disp n-word-bytes))))
248 ;;; This VOP is just to force the TNs used in the cleanup onto the stack.
249 (define-vop (uwp-entry)
251 (:save-p :force-to-stack)
252 (:results (block) (start) (count))
253 (:ignore block start count)
257 (note-this-location vop :non-local-entry)))