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 (defun 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 (defun 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 mov temp
(make-ea :dword
:disp
0) :fs
)
87 (storew temp block unwind-block-next-seh-frame-slot
))))
89 ;;; like MAKE-UNWIND-BLOCK, except that we also store in the specified
90 ;;; tag, and link the block into the CURRENT-CATCH list
91 (define-vop (make-catch-block)
93 (tag :scs
(any-reg descriptor-reg
) :to
(:result
1)))
95 (:results
(block :scs
(any-reg)))
96 (:temporary
(:sc descriptor-reg
) temp
)
98 (inst lea block
(catch-block-ea tn
))
99 (load-tl-symbol-value temp
*current-unwind-protect-block
*)
100 (storew temp block unwind-block-current-uwp-slot
)
101 (storew ebp-tn block unwind-block-current-cont-slot
)
102 (storew (make-fixup nil
:code-object entry-label
)
103 block catch-block-entry-pc-slot
)
106 (inst mov temp
(make-ea :dword
:disp
0) :fs
)
107 (storew temp block unwind-block-next-seh-frame-slot
))
108 (storew tag block catch-block-tag-slot
)
109 (load-tl-symbol-value temp
*current-catch-block
*)
110 (storew temp block catch-block-previous-catch-slot
)
111 (store-tl-symbol-value block
*current-catch-block
* temp
)))
113 ;;; Just set the current unwind-protect to TN's address. This instantiates an
114 ;;; unwind block as an unwind-protect.
115 (define-vop (set-unwind-protect)
117 (:temporary
(:sc unsigned-reg
) new-uwp
#!+sb-thread tls
#!+win32 seh-frame
)
119 (inst lea new-uwp
(catch-block-ea tn
))
122 (storew (make-fixup 'uwp-seh-handler
:assembly-routine
)
123 new-uwp unwind-block-seh-frame-handler-slot
)
125 (make-ea-for-object-slot new-uwp
126 unwind-block-next-seh-frame-slot
0))
127 (inst mov
(make-ea :dword
:disp
0) seh-frame
:fs
))
128 (store-tl-symbol-value new-uwp
*current-unwind-protect-block
* tls
)))
130 (define-vop (unlink-catch-block)
131 (:temporary
(:sc unsigned-reg
) #!+sb-thread tls block
)
133 (:translate %catch-breakup
)
135 (load-tl-symbol-value block
*current-catch-block
*)
136 (loadw block block catch-block-previous-catch-slot
)
137 (store-tl-symbol-value block
*current-catch-block
* tls
)))
139 (define-vop (unlink-unwind-protect)
140 ;; NOTE: When we have both #!+sb-thread and #!+win32, we only need one temp
141 (:temporary
(:sc unsigned-reg
) block
#!+sb-thread tls
#!+win32 seh-frame
)
143 (:translate %unwind-protect-breakup
)
145 (load-tl-symbol-value block
*current-unwind-protect-block
*)
148 (loadw seh-frame block unwind-block-next-seh-frame-slot
)
149 (inst mov
(make-ea :dword
:disp
0) seh-frame
:fs
))
150 (loadw block block unwind-block-current-uwp-slot
)
151 (store-tl-symbol-value block
*current-unwind-protect-block
* tls
)))
154 (define-vop (nlx-entry)
155 ;; Note: we can't list an sc-restriction, 'cause any load vops would
156 ;; be inserted before the return-pc label.
160 (:results
(values :more t
))
161 (:temporary
(:sc descriptor-reg
) move-temp
)
163 (:save-p
:force-to-stack
)
167 (note-this-location vop
:non-local-entry
)
168 (cond ((zerop nvals
))
170 (let ((no-values (gen-label)))
171 (inst mov
(tn-ref-tn values
) nil-value
)
172 (inst jecxz no-values
)
173 (loadw (tn-ref-tn values
) start -
1)
174 (emit-label no-values
)))
176 ;; FIXME: this is mostly copied from
177 ;; DEFAULT-UNKNOWN-VALUES.
178 (collect ((defaults))
180 (tn-ref values
(tn-ref-across tn-ref
)))
182 (let ((default-lab (gen-label))
183 (tn (tn-ref-tn tn-ref
))
184 (first-stack-arg-p (= i register-arg-count
)))
185 (defaults (cons default-lab
(cons tn first-stack-arg-p
)))
186 (inst cmp count
(fixnumize i
))
187 (inst jmp
:le default-lab
)
188 (when first-stack-arg-p
189 (storew edx-tn ebx-tn -
1))
191 ((descriptor-reg any-reg
)
192 (loadw tn start
(frame-word-offset (+ sp-
>fp-offset i
))))
194 (loadw move-temp start
195 (frame-word-offset (+ sp-
>fp-offset i
)))
196 (inst mov tn move-temp
)))))
197 (let ((defaulting-done (gen-label)))
198 (emit-label defaulting-done
)
199 (assemble (*elsewhere
*)
200 (dolist (default (defaults))
201 (emit-label (car default
))
204 (inst mov
(second default
) nil-value
))
205 (inst jmp defaulting-done
))))))
206 (inst mov esp-tn sp
)))
208 (define-vop (nlx-entry-multiple)
212 ;; Again, no SC restrictions for the args, 'cause the loading would
213 ;; happen before the entry label.
215 (:temporary
(:sc unsigned-reg
:offset ecx-offset
:from
(:argument
2)) ecx
)
216 (:temporary
(:sc unsigned-reg
:offset esi-offset
) esi
)
217 (:temporary
(:sc unsigned-reg
:offset edi-offset
) edi
)
218 (:results
(result :scs
(any-reg) :from
(:argument
0))
219 (num :scs
(any-reg control-stack
)))
220 (:save-p
:force-to-stack
)
224 (note-this-location vop
:non-local-entry
)
226 (inst lea esi
(make-ea :dword
:base source
:disp
(- n-word-bytes
)))
227 ;; The 'top' arg contains the %esp value saved at the time the
228 ;; catch block was created and points to where the thrown values
233 (inst sub edi n-word-bytes
)
234 (move ecx count
) ; fixnum words == bytes
236 (inst shr ecx word-shift
) ; word count for <rep movs>
237 ;; If we got zero, we be done.
245 ;; Reset the CSP at last moved arg.
246 (inst lea esp-tn
(make-ea :dword
:base edi
:disp n-word-bytes
))))
249 ;;; This VOP is just to force the TNs used in the cleanup onto the stack.
250 (define-vop (uwp-entry)
252 (:save-p
:force-to-stack
)
253 (:results
(block) (start) (count))
254 (:ignore block start count
)
258 (note-this-location vop
:non-local-entry
)))
260 (define-vop (unwind-to-frame-and-call)
261 (:args
(ofp :scs
(descriptor-reg))
262 (uwp :scs
(descriptor-reg))
263 (function :scs
(descriptor-reg) :to
:load
:target saved-function
))
264 (:arg-types system-area-pointer system-area-pointer t
)
265 (:temporary
(:sc sap-reg
) temp
)
266 (:temporary
(:sc descriptor-reg
:offset ebx-offset
) saved-function
)
267 (:temporary
(:sc unsigned-reg
:offset eax-offset
) block
)
269 ;; Store the function into a non-stack location, since we'll be
270 ;; unwinding the stack and destroying register contents before we
271 ;; use it. It turns out that EBX is preserved as part of the
272 ;; normal multiple-value handling of an unwind, so use that.
273 (move saved-function function
)
275 ;; Allocate space for magic UWP block.
276 (inst sub esp-tn
(* unwind-block-size n-word-bytes
))
277 ;; Set up magic catch / UWP block.
279 (loadw temp uwp sap-pointer-slot other-pointer-lowtag
)
280 (storew temp block unwind-block-current-uwp-slot
)
281 (loadw temp ofp sap-pointer-slot other-pointer-lowtag
)
282 (storew temp block unwind-block-current-cont-slot
)
284 (storew (make-fixup nil
:code-object entry-label
)
286 catch-block-entry-pc-slot
)
288 ;; Run any required UWPs.
289 (inst jmp
(make-fixup 'unwind
:assembly-routine
))
292 ;; Move our saved function to where we want it now.
293 (move block saved-function
)
296 (inst xor ecx-tn ecx-tn
)
300 (make-ea :dword
:base ebp-tn
301 :disp
(* (- sp-
>fp-offset
3) n-word-bytes
)))
303 ;; Push the return-pc so it looks like we just called.
304 (pushw ebp-tn
(frame-word-offset return-pc-save-offset
))
307 (inst jmp
(make-ea :dword
:base block
308 :disp
(- (* closure-fun-slot n-word-bytes
)
309 fun-pointer-lowtag
)))))