1;;;; function call for the x86 VM 2 3;;;; This software is part of the SBCL system. See the README file for 4;;;; more information. 5;;;; 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. 11 12(in-package "SB!VM") 13 14(defconstant arg-count-sc (make-sc-offset any-reg-sc-number ecx-offset)) 15(defconstant closure-sc (make-sc-offset descriptor-reg-sc-number eax-offset)) 16 17;;; Make a passing location TN for a local call return PC. 18;;; 19;;; Always wire the return PC location to the stack in its standard 20;;; location. 21(defun make-return-pc-passing-location (standard) 22 (declare (ignore standard)) 23 (make-wired-tn (primitive-type-or-lose 'system-area-pointer) 24 sap-stack-sc-number return-pc-save-offset)) 25 26(defconstant return-pc-passing-offset 27 (make-sc-offset sap-stack-sc-number return-pc-save-offset)) 28 29;;; This is similar to MAKE-RETURN-PC-PASSING-LOCATION, but makes a 30;;; location to pass OLD-FP in. 31;;; 32;;; This is wired in both the standard and the local-call conventions, 33;;; because we want to be able to assume it's always there. Besides, 34;;; the x86 doesn't have enough registers to really make it profitable 35;;; to pass it in a register. 36(defun make-old-fp-passing-location (standard) 37 (declare (ignore standard)) 38 (make-wired-tn *fixnum-primitive-type* control-stack-sc-number 39 ocfp-save-offset)) 40 41(defconstant old-fp-passing-offset 42 (make-sc-offset control-stack-sc-number ocfp-save-offset)) 43 44;;; Make the TNs used to hold OLD-FP and RETURN-PC within the current 45;;; function. We treat these specially so that the debugger can find 46;;; them at a known location. 47;;; 48;;; Without using a save-tn - which does not make much sense if it is 49;;; wired to the stack? 50(defun make-old-fp-save-location (physenv) 51 (physenv-debug-live-tn (make-wired-tn *fixnum-primitive-type* 52 control-stack-sc-number 53 ocfp-save-offset) 54 physenv)) 55(defun make-return-pc-save-location (physenv) 56 (physenv-debug-live-tn 57 (make-wired-tn (primitive-type-or-lose 'system-area-pointer) 58 sap-stack-sc-number return-pc-save-offset) 59 physenv)) 60 61;;; Make a TN for the standard argument count passing location. We only 62;;; need to make the standard location, since a count is never passed when we 63;;; are using non-standard conventions. 64(defun make-arg-count-location () 65 (make-wired-tn *fixnum-primitive-type* any-reg-sc-number ecx-offset)) 66 67;;;; frame hackery 68 69;;; This is used for setting up the Old-FP in local call. 70(define-vop (current-fp) 71 (:results (val :scs (any-reg control-stack))) 72 (:generator 1 73 (move val ebp-tn))) 74 75;;; We don't have a separate NFP, so we don't need to do anything here. 76(define-vop (compute-old-nfp) 77 (:results (val)) 78 (:ignore val) 79 (:generator 1 80 nil)) 81 82;;; Accessing a slot from an earlier stack frame is definite hackery. 83(define-vop (ancestor-frame-ref) 84 (:args (frame-pointer :scs (descriptor-reg)) 85 (variable-home-tn :load-if nil)) 86 (:results (value :scs (descriptor-reg any-reg))) 87 (:policy :fast-safe) 88 (:generator 4 89 (aver (sc-is variable-home-tn control-stack)) 90 (loadw value frame-pointer 91 (frame-word-offset (tn-offset variable-home-tn))))) 92(define-vop (ancestor-frame-set) 93 (:args (frame-pointer :scs (descriptor-reg)) 94 (value :scs (descriptor-reg any-reg))) 95 (:results (variable-home-tn :load-if nil)) 96 (:policy :fast-safe) 97 (:generator 4 98 (aver (sc-is variable-home-tn control-stack)) 99 (storew value frame-pointer 100 (frame-word-offset (tn-offset variable-home-tn))))) 101 102(macrolet ((define-frame-op 103 (suffix sc stack-sc instruction 104 &optional (ea 105 `(make-ea :dword 106 :base frame-pointer 107 :disp (frame-byte-offset 108 (tn-offset variable-home-tn))))) 109 (let ((reffer (symbolicate 'ancestor-frame-ref '/ suffix)) 110 (setter (symbolicate 'ancestor-frame-set '/ suffix))) 111 `(progn 112 (define-vop (,reffer ancestor-frame-ref) 113 (:results (value :scs (,sc))) 114 (:generator 4 115 (aver (sc-is variable-home-tn ,stack-sc)) 116 (inst ,instruction value 117 ,ea))) 118 (define-vop (,setter ancestor-frame-set) 119 (:args (frame-pointer :scs (descriptor-reg)) 120 (value :scs (,sc))) 121 (:generator 4 122 (aver (sc-is variable-home-tn ,stack-sc)) 123 (inst ,instruction ,ea value)))))) 124 (define-x87-frame-op 125 (suffix sc stack-sc (load set) 126 &optional (ea 127 `(make-ea :dword 128 :base frame-pointer 129 :disp (frame-byte-offset 130 (tn-offset variable-home-tn))))) 131 (let ((reffer (symbolicate 'ancestor-frame-ref '/ suffix)) 132 (setter (symbolicate 'ancestor-frame-set '/ suffix))) 133 `(progn 134 (define-vop (,reffer ancestor-frame-ref) 135 (:results (value :scs (,sc))) 136 (:generator 4 137 (aver (sc-is variable-home-tn ,stack-sc)) 138 ,(if (symbolp load) 139 `(with-empty-tn@fp-top (value) 140 (inst ,load ,ea)) 141 load))) 142 (define-vop (,setter ancestor-frame-set) 143 (:args (frame-pointer :scs (descriptor-reg)) 144 (value :scs (,sc))) 145 (:generator 4 146 (aver (sc-is variable-home-tn ,stack-sc)) 147 ,(if (symbolp set) 148 `(with-tn@fp-top (value) 149 (inst ,set ,ea)) 150 set))))))) 151 (define-frame-op signed-byte-32 signed-reg signed-stack mov) 152 (define-frame-op unsigned-byte-32 unsigned-reg unsigned-stack mov) 153 (define-frame-op system-area-pointer sap-reg sap-stack mov) 154 155 (define-x87-frame-op double-float double-reg double-stack 156 (fldd fstd) (make-ea :dword 157 :base frame-pointer 158 :disp (frame-byte-offset 159 (1+ (tn-offset variable-home-tn))))) 160 (define-x87-frame-op single-float single-reg single-stack 161 (fld fst)) 162 163 (define-x87-frame-op complex-double-float complex-double-reg 164 complex-double-stack 165 ((let ((real (complex-double-reg-real-tn value)) 166 (imag (complex-double-reg-imag-tn value))) 167 (with-empty-tn@fp-top (real) 168 (inst fldd (ea-for-cdf-real-stack variable-home-tn frame-pointer))) 169 (with-empty-tn@fp-top (imag) 170 (inst fldd (ea-for-cdf-imag-stack variable-home-tn frame-pointer)))) 171 (let ((real (complex-double-reg-real-tn value)) 172 (imag (complex-double-reg-imag-tn value))) 173 (with-tn@fp-top (real) 174 (inst fstd (ea-for-cdf-real-stack variable-home-tn frame-pointer))) 175 (with-tn@fp-top (imag) 176 (inst fstd (ea-for-cdf-imag-stack variable-home-tn frame-pointer)))))) 177 (define-x87-frame-op complex-single-float complex-single-reg 178 complex-single-stack 179 ((let ((real (complex-single-reg-real-tn value)) 180 (imag (complex-single-reg-imag-tn value))) 181 (with-empty-tn@fp-top (real) 182 (inst fld (ea-for-csf-real-stack variable-home-tn frame-pointer))) 183 (with-empty-tn@fp-top (imag) 184 (inst fld (ea-for-csf-imag-stack variable-home-tn frame-pointer)))) 185 (let ((real (complex-single-reg-real-tn value)) 186 (imag (complex-single-reg-imag-tn value))) 187 (with-tn@fp-top (real) 188 (inst fst (ea-for-csf-real-stack variable-home-tn frame-pointer))) 189 (with-tn@fp-top (imag) 190 (inst fst (ea-for-csf-imag-stack variable-home-tn frame-pointer))))))) 191 192(defun primitive-type-indirect-cell-type (ptype) 193 (declare (type primitive-type ptype)) 194 (macrolet ((foo (&body data) 195 `(case (primitive-type-name ptype) 196 ,@(loop for (name stack-sc ref set) in data 197 collect 198 `(,name 199 (load-time-value 200 (list (primitive-type-or-lose ',name) 201 (sc-or-lose ',stack-sc) 202 (lambda (node block fp value res) 203 (sb!c::vop ,ref node block 204 fp value res)) 205 (lambda (node block fp new-val value) 206 (sb!c::vop ,set node block 207 fp new-val value))))))))) 208 (foo (double-float double-stack 209 ancestor-frame-ref/double-float 210 ancestor-frame-set/double-float) 211 (single-float single-stack 212 ancestor-frame-ref/single-float 213 ancestor-frame-set/single-float) 214 (complex-double-float complex-double-stack 215 ancestor-frame-ref/complex-double-float 216 ancestor-frame-set/complex-double-float) 217 (complex-single-float complex-single-stack 218 ancestor-frame-ref/complex-single-float 219 ancestor-frame-set/complex-single-float) 220 (signed-byte-32 signed-stack 221 ancestor-frame-ref/signed-byte-32 222 ancestor-frame-set/signed-byte-32) 223 (unsigned-byte-32 unsigned-stack 224 ancestor-frame-ref/unsigned-byte-32 225 ancestor-frame-set/unsigned-byte-32) 226 (unsigned-byte-31 unsigned-stack 227 ancestor-frame-ref/unsigned-byte-32 228 ancestor-frame-set/unsigned-byte-32) 229 (system-area-pointer sap-stack 230 ancestor-frame-ref/system-area-pointer 231 ancestor-frame-set/system-area-pointer)))) 232 233(define-vop (xep-allocate-frame) 234 (:info start-lab) 235 (:generator 1 236 (emit-alignment n-lowtag-bits) 237 (emit-label start-lab) 238 ;; Skip space for the function header. 239 (inst simple-fun-header-word) 240 (dotimes (i (1- simple-fun-code-offset)) 241 (inst dword 0)) 242 243 ;; The start of the actual code. 244 ;; Save the return-pc. 245 (popw ebp-tn (frame-word-offset return-pc-save-offset)))) 246 247(define-vop (xep-setup-sp) 248 (:generator 1 249 (inst lea esp-tn 250 (make-ea :dword :base ebp-tn 251 :disp (- (* n-word-bytes 252 (- (max 3 (sb-allocated-size 'stack)) 253 sp->fp-offset))))))) 254 255;;; This is emitted directly before either a known-call-local, call-local, 256;;; or a multiple-call-local. All it does is allocate stack space for the 257;;; callee (who has the same size stack as us). 258(define-vop (allocate-frame) 259 (:results (res :scs (any-reg)) 260 (nfp)) 261 (:info callee) 262 (:ignore nfp callee) 263 (:generator 2 264 (inst lea res (make-ea :dword :base esp-tn 265 :disp (- (* sp->fp-offset n-word-bytes)))) 266 (inst sub esp-tn (* n-word-bytes (sb-allocated-size 'stack))))) 267 268;;; Allocate a partial frame for passing stack arguments in a full 269;;; call. NARGS is the number of arguments passed. We allocate at 270;;; least 3 slots, because the XEP noise is going to want to use them 271;;; before it can extend the stack. 272(define-vop (allocate-full-call-frame) 273 (:info nargs) 274 (:results (res :scs (any-reg))) 275 (:generator 2 276 (inst lea res (make-ea :dword :base esp-tn 277 :disp (- (* sp->fp-offset n-word-bytes)))) 278 (inst sub esp-tn (* (max nargs 3) n-word-bytes)))) 279 280;;; Emit code needed at the return-point from an unknown-values call 281;;; for a fixed number of values. Values is the head of the TN-REF 282;;; list for the locations that the values are to be received into. 283;;; Nvals is the number of values that are to be received (should 284;;; equal the length of Values). 285;;; 286;;; If 0 or 1 values are expected, then we just emit an instruction to 287;;; reset the SP (which will only be executed when other than 1 value 288;;; is returned.) 289;;; 290;;; In the general case we have to do three things: 291;;; -- Default unsupplied register values. This need only be done 292;;; when a single value is returned, since register values are 293;;; defaulted by the called in the non-single case. 294;;; -- Default unsupplied stack values. This needs to be done whenever 295;;; there are stack values. 296;;; -- Reset SP. This must be done whenever other than 1 value is 297;;; returned, regardless of the number of values desired. 298(defun default-unknown-values (vop values nvals node) 299 (declare (type (or tn-ref null) values) 300 (type unsigned-byte nvals)) 301 (let ((type (sb!c::basic-combination-derived-type node))) 302 (cond 303 ((<= nvals 1) 304 (note-this-location vop :single-value-return) 305 (cond 306 ((<= (values-type-max-value-count type) 307 register-arg-count) 308 (when (and (named-type-p type) 309 (eq nil (named-type-name type))) 310 ;; The function never returns, it may happen that the code 311 ;; ends right here leavig the :SINGLE-VALUE-RETURN note 312 ;; dangling. Let's emit a NOP. 313 (inst nop))) 314 ((not (values-type-may-be-single-value-p type)) 315 (inst mov esp-tn ebx-tn)) 316 ((member :cmov *backend-subfeatures*) 317 (inst cmov :c esp-tn ebx-tn)) 318 (t 319 (let ((single-value (gen-label))) 320 (inst jmp :nc single-value) 321 (inst mov esp-tn ebx-tn) 322 (emit-label single-value))))) 323 ((<= nvals register-arg-count) 324 (note-this-location vop :unknown-return) 325 (when (values-type-may-be-single-value-p type) 326 (let ((regs-defaulted (gen-label))) 327 (inst jmp :c regs-defaulted) 328 ;; Default the unsupplied registers. 329 (let* ((2nd-tn-ref (tn-ref-across values)) 330 (2nd-tn (tn-ref-tn 2nd-tn-ref))) 331 (inst mov 2nd-tn nil-value) 332 (when (> nvals 2) 333 (loop 334 for tn-ref = (tn-ref-across 2nd-tn-ref) 335 then (tn-ref-across tn-ref) 336 for count from 2 below register-arg-count 337 do (inst mov (tn-ref-tn tn-ref) 2nd-tn)))) 338 (inst mov ebx-tn esp-tn) 339 (emit-label regs-defaulted))) 340 (when (< register-arg-count 341 (values-type-max-value-count type)) 342 (inst mov esp-tn ebx-tn))) 343 ((<= nvals 7) 344 ;; The number of bytes depends on the relative jump instructions. 345 ;; Best case is 31+(n-3)*14, worst case is 35+(n-3)*18. For 346 ;; NVALS=6 that is 73/89 bytes, and for NVALS=7 that is 87/107 347 ;; bytes which is likely better than using the blt below. 348 (let ((regs-defaulted (gen-label)) 349 (defaulting-done (gen-label)) 350 (default-stack-slots (gen-label))) 351 (note-this-location vop :unknown-return) 352 ;; Branch off to the MV case. 353 (inst jmp :c regs-defaulted) 354 ;; Do the single value case. 355 ;; Default the register args 356 (inst mov eax-tn nil-value) 357 (do ((i 1 (1+ i)) 358 (val (tn-ref-across values) (tn-ref-across val))) 359 ((= i (min nvals register-arg-count))) 360 (inst mov (tn-ref-tn val) eax-tn)) 361 ;; Fake other registers so it looks like we returned with all the 362 ;; registers filled in. 363 (move ebx-tn esp-tn) 364 (inst jmp default-stack-slots) 365 (emit-label regs-defaulted) 366 (inst mov eax-tn nil-value) 367 (collect ((defaults)) 368 (do ((i register-arg-count (1+ i)) 369 (val (do ((i 0 (1+ i)) 370 (val values (tn-ref-across val))) 371 ((= i register-arg-count) val)) 372 (tn-ref-across val))) 373 ((null val)) 374 (let ((default-lab (gen-label)) 375 (tn (tn-ref-tn val)) 376 (first-stack-arg-p (= i register-arg-count))) 377 (defaults (cons default-lab 378 (cons tn first-stack-arg-p))) 379 (inst cmp ecx-tn (fixnumize i)) 380 (inst jmp :be default-lab) 381 (when first-stack-arg-p 382 ;; There are stack args so the frame of the callee is 383 ;; still there, save EDX in its first slot temporalily. 384 (storew edx-tn ebx-tn (frame-word-offset sp->fp-offset))) 385 (loadw edx-tn ebx-tn (frame-word-offset (+ sp->fp-offset i))) 386 (inst mov tn edx-tn))) 387 (emit-label defaulting-done) 388 (loadw edx-tn ebx-tn (frame-word-offset sp->fp-offset)) 389 (move esp-tn ebx-tn) 390 (let ((defaults (defaults))) 391 (when defaults 392 (assemble (*elsewhere*) 393 (emit-label default-stack-slots) 394 (dolist (default defaults) 395 (emit-label (car default)) 396 (when (cddr default) 397 ;; We are setting the first stack argument to NIL. 398 ;; The callee's stack frame is dead, save EDX by 399 ;; pushing it to the stack, it will end up at same 400 ;; place as in the (STOREW EDX-TN EBX-TN -1) case 401 ;; above. 402 (inst push edx-tn)) 403 (inst mov (second default) eax-tn)) 404 (inst jmp defaulting-done))))))) 405 (t 406 ;; 91 bytes for this branch. 407 (let ((regs-defaulted (gen-label)) 408 (restore-edi (gen-label)) 409 (no-stack-args (gen-label)) 410 (default-stack-vals (gen-label)) 411 (count-okay (gen-label))) 412 (note-this-location vop :unknown-return) 413 ;; Branch off to the MV case. 414 (inst jmp :c regs-defaulted) 415 ;; Default the register args, and set up the stack as if we 416 ;; entered the MV return point. 417 (inst mov ebx-tn esp-tn) 418 (inst mov edi-tn nil-value) 419 (inst mov esi-tn edi-tn) 420 ;; Compute a pointer to where to put the [defaulted] stack values. 421 (emit-label no-stack-args) 422 (inst push edx-tn) 423 (inst push edi-tn) 424 (inst lea edi-tn 425 (make-ea :dword :base ebp-tn 426 :disp (frame-byte-offset register-arg-count))) 427 ;; Load EAX with NIL so we can quickly store it, and set up 428 ;; stuff for the loop. 429 (inst mov eax-tn nil-value) 430 (inst std) 431 (inst mov ecx-tn (- nvals register-arg-count)) 432 ;; Jump into the default loop. 433 (inst jmp default-stack-vals) 434 ;; The regs are defaulted. We need to copy any stack arguments, 435 ;; and then default the remaining stack arguments. 436 (emit-label regs-defaulted) 437 ;; Compute the number of stack arguments, and if it's zero or 438 ;; less, don't copy any stack arguments. 439 (inst sub ecx-tn (fixnumize register-arg-count)) 440 (inst jmp :le no-stack-args) 441 ;; Save EDI. 442 (storew edi-tn ebx-tn (frame-word-offset (+ sp->fp-offset 1))) 443 ;; Throw away any unwanted args. 444 (inst cmp ecx-tn (fixnumize (- nvals register-arg-count))) 445 (inst jmp :be count-okay) 446 (inst mov ecx-tn (fixnumize (- nvals register-arg-count))) 447 (emit-label count-okay) 448 ;; Save the number of stack values. 449 (inst mov eax-tn ecx-tn) 450 ;; Compute a pointer to where the stack args go. 451 (inst lea edi-tn 452 (make-ea :dword :base ebp-tn 453 :disp (frame-byte-offset register-arg-count))) 454 ;; Save ESI, and compute a pointer to where the args come from. 455 (storew esi-tn ebx-tn (frame-word-offset (+ sp->fp-offset 2))) 456 (inst lea esi-tn 457 (make-ea :dword :base ebx-tn 458 :disp (frame-byte-offset 459 (+ sp->fp-offset register-arg-count)))) 460 ;; Do the copy. 461 (inst shr ecx-tn word-shift) ; make word count 462 (inst std) 463 (inst rep) 464 (inst movs :dword) 465 ;; Restore ESI. 466 (loadw esi-tn ebx-tn (frame-word-offset (+ sp->fp-offset 2))) 467 ;; Now we have to default the remaining args. Find out how many. 468 (inst sub eax-tn (fixnumize (- nvals register-arg-count))) 469 (inst neg eax-tn) 470 ;; If none, then just blow out of here. 471 (inst jmp :le restore-edi) 472 (inst mov ecx-tn eax-tn) 473 (inst shr ecx-tn word-shift) ; word count 474 ;; Load EAX with NIL for fast storing. 475 (inst mov eax-tn nil-value) 476 ;; Do the store. 477 (emit-label default-stack-vals) 478 (inst rep) 479 (inst stos eax-tn) 480 ;; Restore EDI, and reset the stack. 481 (emit-label restore-edi) 482 (loadw edi-tn ebx-tn (frame-word-offset (+ sp->fp-offset 1))) 483 (inst mov esp-tn ebx-tn) 484 (inst cld))))) 485 (values)) 486 487;;;; unknown values receiving 488 489;;; Emit code needed at the return point for an unknown-values call 490;;; for an arbitrary number of values. 491;;; 492;;; We do the single and non-single cases with no shared code: there 493;;; doesn't seem to be any potential overlap, and receiving a single 494;;; value is more important efficiency-wise. 495;;; 496;;; When there is a single value, we just push it on the stack, 497;;; returning the old SP and 1. 498;;; 499;;; When there is a variable number of values, we move all of the 500;;; argument registers onto the stack, and return ARGS and NARGS. 501;;; 502;;; ARGS and NARGS are TNs wired to the named locations. We must 503;;; explicitly allocate these TNs, since their lifetimes overlap with 504;;; the results start and count. (Also, it's nice to be able to target 505;;; them.) 506(defun receive-unknown-values (args nargs start count node) 507 (declare (type tn args nargs start count)) 508 (let ((type (sb!c::basic-combination-derived-type node)) 509 (variable-values (gen-label)) 510 (stack-values (gen-label)) 511 (done (gen-label))) 512 (when (values-type-may-be-single-value-p type) 513 (inst jmp :c variable-values) 514 (cond ((location= start (first *register-arg-tns*)) 515 (inst push (first *register-arg-tns*)) 516 (inst lea start (make-ea :dword :base esp-tn :disp n-word-bytes))) 517 (t (inst mov start esp-tn) 518 (inst push (first *register-arg-tns*)))) 519 (inst mov count (fixnumize 1)) 520 (inst jmp done) 521 (emit-label variable-values)) 522 ;; The stack frame is burnt and RETurned from if there are no 523 ;; stack values. In this case quickly reallocate sufficient space. 524 (when (<= (values-type-min-value-count type) 525 register-arg-count) 526 (inst cmp nargs (fixnumize register-arg-count)) 527 (inst jmp :g stack-values) 528 (inst sub esp-tn nargs) 529 (emit-label stack-values)) 530 ;; dtc: this writes the registers onto the stack even if they are 531 ;; not needed, only the number specified in ecx are used and have 532 ;; stack allocated to them. No harm is done. 533 (loop 534 for arg in *register-arg-tns* 535 for i downfrom -1 536 for j below (values-type-max-value-count type) 537 do (storew arg args i)) 538 (move start args) 539 (move count nargs) 540 541 (emit-label done)) 542 (values)) 543 544;;; VOP that can be inherited by unknown values receivers. The main thing this 545;;; handles is allocation of the result temporaries. 546(define-vop (unknown-values-receiver) 547 (:temporary (:sc descriptor-reg :offset ebx-offset 548 :from :eval :to (:result 0)) 549 values-start) 550 (:temporary (:sc any-reg :offset ecx-offset 551 :from :eval :to (:result 1)) 552 nvals) 553 (:results (start :scs (any-reg control-stack)) 554 (count :scs (any-reg control-stack)))) 555 556;;;; local call with unknown values convention return 557 558(defun check-ocfp-and-return-pc (old-fp return-pc) 559 #+nil 560 (format t "*known-return: old-fp ~S, tn-kind ~S; ~S ~S~%" 561 old-fp (sb!c::tn-kind old-fp) (sb!c::tn-save-tn old-fp) 562 (sb!c::tn-kind (sb!c::tn-save-tn old-fp))) 563 #+nil 564 (format t "*known-return: return-pc ~S, tn-kind ~S; ~S ~S~%" 565 return-pc (sb!c::tn-kind return-pc) 566 (sb!c::tn-save-tn return-pc) 567 (sb!c::tn-kind (sb!c::tn-save-tn return-pc))) 568 (unless (and (sc-is old-fp control-stack) 569 (= (tn-offset old-fp) ocfp-save-offset)) 570 (error "ocfp not on stack in standard save location?")) 571 (unless (and (sc-is return-pc sap-stack) 572 (= (tn-offset return-pc) return-pc-save-offset)) 573 (error "return-pc not on stack in standard save location?"))) 574 575;;; The local call convention doesn't fit that well with x86-style 576;;; calls. Emit a header for local calls to pop the return address 577;;; in the right place. 578(defun emit-block-header (start-label trampoline-label fall-thru-p alignp) 579 (declare (ignore alignp)) 580 (when trampoline-label 581 (when fall-thru-p 582 (inst jmp start-label)) 583 (emit-label trampoline-label) 584 (popw ebp-tn (frame-word-offset return-pc-save-offset))) 585 (emit-label start-label)) 586 587;;; Non-TR local call for a fixed number of values passed according to 588;;; the unknown values convention. 589;;; 590;;; FP is the frame pointer in install before doing the call. 591;;; 592;;; NFP would be the number-stack frame pointer if we had a separate 593;;; number stack. 594;;; 595;;; Args are the argument passing locations, which are specified only 596;;; to terminate their lifetimes in the caller. 597;;; 598;;; VALUES are the return value locations (wired to the standard 599;;; passing locations). NVALS is the number of values received. 600;;; 601;;; Save is the save info, which we can ignore since saving has been 602;;; done. 603;;; 604;;; TARGET is a continuation pointing to the start of the called 605;;; function. 606(define-vop (call-local) 607 (:args (fp) 608 (nfp) 609 (args :more t)) 610 (:results (values :more t)) 611 (:save-p t) 612 (:move-args :local-call) 613 (:info arg-locs callee target nvals) 614 (:vop-var vop) 615 (:ignore nfp arg-locs args callee) 616 (:node-var node) 617 (:generator 5 618 (move ebp-tn fp) 619 (note-this-location vop :call-site) 620 (inst call target) 621 (default-unknown-values vop values nvals node))) 622 623;;; Non-TR local call for a variable number of return values passed according 624;;; to the unknown values convention. The results are the start of the values 625;;; glob and the number of values received. 626(define-vop (multiple-call-local unknown-values-receiver) 627 (:args (fp) 628 (nfp) 629 (args :more t)) 630 (:save-p t) 631 (:move-args :local-call) 632 (:info save callee target) 633 (:ignore args save nfp callee) 634 (:vop-var vop) 635 (:node-var node) 636 (:generator 20 637 (move ebp-tn fp) 638 (note-this-location vop :call-site) 639 (inst call target) 640 (note-this-location vop :unknown-return) 641 (receive-unknown-values values-start nvals start count node))) 642 643;;;; local call with known values return 644 645;;; Non-TR local call with known return locations. Known-value return 646;;; works just like argument passing in local call. 647;;; 648;;; Note: we can't use normal load-tn allocation for the fixed args, 649;;; since all registers may be tied up by the more operand. Instead, 650;;; we use MAYBE-LOAD-STACK-TN. 651(define-vop (known-call-local) 652 (:args (fp) 653 (nfp) 654 (args :more t)) 655 (:results (res :more t)) 656 (:move-args :local-call) 657 (:save-p t) 658 (:info save callee target) 659 (:ignore args res save nfp callee) 660 (:vop-var vop) 661 (:generator 5 662 (move ebp-tn fp) 663 (note-this-location vop :call-site) 664 (inst call target) 665 (note-this-location vop :known-return))) 666 667;;; From Douglas Crosher 668;;; Return from known values call. We receive the return locations as 669;;; arguments to terminate their lifetimes in the returning function. We 670;;; restore FP and CSP and jump to the Return-PC. 671(define-vop (known-return) 672 (:args (old-fp) 673 (return-pc) 674 (vals :more t)) 675 (:move-args :known-return) 676 (:info val-locs) 677 (:ignore val-locs vals) 678 (:vop-var vop) 679 (:generator 6 680 (check-ocfp-and-return-pc old-fp return-pc) 681 ;; Zot all of the stack except for the old-fp and return-pc. 682 (inst mov esp-tn ebp-tn) 683 (inst pop ebp-tn) 684 (inst ret))) 685 686;;;; full call 687;;; 688;;; There is something of a cross-product effect with full calls. 689;;; Different versions are used depending on whether we know the 690;;; number of arguments or the name of the called function, and 691;;; whether we want fixed values, unknown values, or a tail call. 692;;; 693;;; In full call, the arguments are passed creating a partial frame on 694;;; the stack top and storing stack arguments into that frame. On 695;;; entry to the callee, this partial frame is pointed to by FP. 696 697;;; This macro helps in the definition of full call VOPs by avoiding 698;;; code replication in defining the cross-product VOPs. 699;;; 700;;; NAME is the name of the VOP to define. 701;;; 702;;; NAMED is true if the first argument is an fdefinition object whose 703;;; definition is to be called. 704;;; 705;;; RETURN is either :FIXED, :UNKNOWN or :TAIL: 706;;; -- If :FIXED, then the call is for a fixed number of values, returned in 707;;; the standard passing locations (passed as result operands). 708;;; -- If :UNKNOWN, then the result values are pushed on the stack, and the 709;;; result values are specified by the Start and Count as in the 710;;; unknown-values continuation representation. 711;;; -- If :TAIL, then do a tail-recursive call. No values are returned. 712;;; The Old-Fp and Return-PC are passed as the second and third arguments. 713;;; 714;;; In non-tail calls, the pointer to the stack arguments is passed as 715;;; the last fixed argument. If Variable is false, then the passing 716;;; locations are passed as a more arg. Variable is true if there are 717;;; a variable number of arguments passed on the stack. Variable 718;;; cannot be specified with :TAIL return. TR variable argument call 719;;; is implemented separately. 720;;; 721;;; In tail call with fixed arguments, the passing locations are 722;;; passed as a more arg, but there is no new-FP, since the arguments 723;;; have been set up in the current frame. 724(macrolet ((define-full-call (name named return variable) 725 (aver (not (and variable (eq return :tail)))) 726 `(define-vop (,name 727 ,@(when (eq return :unknown) 728 '(unknown-values-receiver))) 729 (:args 730 ,@(unless (eq return :tail) 731 '((new-fp :scs (any-reg) :to (:argument 1)))) 732 733 (fun :scs (descriptor-reg control-stack) 734 :target eax :to (:argument 0)) 735 736 ,@(when (eq return :tail) 737 '((old-fp) 738 (return-pc))) 739 740 ,@(unless variable '((args :more t :scs (descriptor-reg))))) 741 742 ,@(when (eq return :fixed) 743 '((:results (values :more t)))) 744 745 (:save-p ,(if (eq return :tail) :compute-only t)) 746 747 ,@(unless (or (eq return :tail) variable) 748 '((:move-args :full-call))) 749 750 (:vop-var vop) 751 (:info 752 ,@(unless (or variable (eq return :tail)) '(arg-locs)) 753 ,@(unless variable '(nargs)) 754 ,@(when (eq return :fixed) '(nvals)) 755 step-instrumenting) 756 757 (:ignore 758 ,@(unless (or variable (eq return :tail)) '(arg-locs)) 759 ,@(unless variable '(args))) 760 761 ;; We pass either the fdefn object (for named call) or 762 ;; the actual function object (for unnamed call) in 763 ;; EAX. With named call, closure-tramp will replace it 764 ;; with the real function and invoke the real function 765 ;; for closures. Non-closures do not need this value, 766 ;; so don't care what shows up in it. 767 (:temporary 768 (:sc descriptor-reg 769 :offset eax-offset 770 :from (:argument 0) 771 :to :eval) 772 eax) 773 774 ;; We pass the number of arguments in ECX. 775 (:temporary (:sc unsigned-reg :offset ecx-offset :to :eval) ecx) 776 777 ;; With variable call, we have to load the 778 ;; register-args out of the (new) stack frame before 779 ;; doing the call. Therefore, we have to tell the 780 ;; lifetime stuff that we need to use them. 781 ,@(when variable 782 (mapcar (lambda (name offset) 783 `(:temporary (:sc descriptor-reg 784 :offset ,offset 785 :from (:argument 0) 786 :to :eval) 787 ,name)) 788 *register-arg-names* *register-arg-offsets*)) 789 790 ,@(when (eq return :tail) 791 '((:temporary (:sc unsigned-reg 792 :from (:argument 1) 793 :to (:argument 2)) 794 old-fp-tmp))) 795 ,@(unless (eq return :tail) 796 '((:node-var node))) 797 798 (:generator ,(+ (if named 5 0) 799 (if variable 19 1) 800 (if (eq return :tail) 0 10) 801 15 802 (if (eq return :unknown) 25 0)) 803 804 ;; This has to be done before the frame pointer is 805 ;; changed! EAX stores the 'lexical environment' needed 806 ;; for closures. 807 (move eax fun) 808 809 810 ,@(if variable 811 ;; For variable call, compute the number of 812 ;; arguments and move some of the arguments to 813 ;; registers. 814 (collect ((noise)) 815 ;; Compute the number of arguments. 816 (noise '(inst mov ecx new-fp)) 817 (noise '(inst sub ecx esp-tn)) 818 ;; Move the necessary args to registers, 819 ;; this moves them all even if they are 820 ;; not all needed. 821 (loop 822 for name in *register-arg-names* 823 for index downfrom -1 824 do (noise `(loadw ,name new-fp ,index))) 825 (noise)) 826 '((if (zerop nargs) 827 (inst xor ecx ecx) 828 (inst mov ecx (fixnumize nargs))))) 829 ,@(cond ((eq return :tail) 830 '(;; Python has figured out what frame we should 831 ;; return to so might as well use that clue. 832 ;; This seems really important to the 833 ;; implementation of things like 834 ;; (without-interrupts ...) 835 ;; 836 ;; dtc; Could be doing a tail call from a 837 ;; known-local-call etc in which the old-fp 838 ;; or ret-pc are in regs or in non-standard 839 ;; places. If the passing location were 840 ;; wired to the stack in standard locations 841 ;; then these moves will be un-necessary; 842 ;; this is probably best for the x86. 843 (sc-case old-fp 844 ((control-stack) 845 (unless (= ocfp-save-offset 846 (tn-offset old-fp)) 847 ;; FIXME: FORMAT T for stale 848 ;; diagnostic output (several of 849 ;; them around here), ick 850 (error "** tail-call old-fp not S0~%") 851 (move old-fp-tmp old-fp) 852 (storew old-fp-tmp 853 ebp-tn 854 (frame-word-offset ocfp-save-offset)))) 855 ((any-reg descriptor-reg) 856 (error "** tail-call old-fp in reg not S0~%") 857 (storew old-fp 858 ebp-tn 859 (frame-word-offset ocfp-save-offset)))) 860 861 ;; For tail call, we have to push the 862 ;; return-pc so that it looks like we CALLed 863 ;; despite the fact that we are going to JMP. 864 (inst push return-pc) 865 )) 866 (t 867 ;; For non-tail call, we have to save our 868 ;; frame pointer and install the new frame 869 ;; pointer. We can't load stack tns after this 870 ;; point. 871 `(;; Python doesn't seem to allocate a frame 872 ;; here which doesn't leave room for the 873 ;; ofp/ret stuff. 874 875 ;; The variable args are on the stack and 876 ;; become the frame, but there may be <3 877 ;; args and 3 stack slots are assumed 878 ;; allocate on the call. So need to ensure 879 ;; there are at least 3 slots. This hack 880 ;; just adds 3 more. 881 ,(if variable 882 '(inst sub esp-tn (fixnumize 3))) 883 884 ;; Bias the new-fp for use as an fp 885 ,(if variable 886 '(inst sub new-fp (fixnumize sp->fp-offset))) 887 888 ;; Save the fp 889 (storew ebp-tn new-fp 890 (frame-word-offset ocfp-save-offset)) 891 892 (move ebp-tn new-fp) ; NB - now on new stack frame. 893 ))) 894 895 (when step-instrumenting 896 (emit-single-step-test) 897 (inst jmp :eq DONE) 898 (inst break single-step-around-trap)) 899 DONE 900 901 (note-this-location vop :call-site) 902 903 (inst ,(if (eq return :tail) 'jmp 'call) 904 ,(if named 905 '(make-ea-for-object-slot eax fdefn-raw-addr-slot 906 other-pointer-lowtag) 907 '(make-ea-for-object-slot eax closure-fun-slot 908 fun-pointer-lowtag))) 909 ,@(ecase return 910 (:fixed 911 '((default-unknown-values vop values nvals node))) 912 (:unknown 913 '((note-this-location vop :unknown-return) 914 (receive-unknown-values values-start nvals start count 915 node))) 916 (:tail)))))) 917 918 (define-full-call call nil :fixed nil) 919 (define-full-call call-named t :fixed nil) 920 (define-full-call multiple-call nil :unknown nil) 921 (define-full-call multiple-call-named t :unknown nil) 922 (define-full-call tail-call nil :tail nil) 923 (define-full-call tail-call-named t :tail nil) 924 925 (define-full-call call-variable nil :fixed t) 926 (define-full-call multiple-call-variable nil :unknown t)) 927 928;;; This is defined separately, since it needs special code that BLT's 929;;; the arguments down. All the real work is done in the assembly 930;;; routine. We just set things up so that it can find what it needs. 931(define-vop (tail-call-variable) 932 (:args (args :scs (any-reg control-stack) :target esi) 933 (function :scs (descriptor-reg control-stack) :target eax) 934 (old-fp) 935 (return-pc)) 936 (:temporary (:sc unsigned-reg :offset esi-offset :from (:argument 0)) esi) 937 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 1)) eax) 938 (:generator 75 939 (check-ocfp-and-return-pc old-fp return-pc) 940 ;; Move these into the passing locations if they are not already there. 941 (move esi args) 942 (move eax function) 943 ;; And jump to the assembly routine. 944 (inst jmp (make-fixup 'tail-call-variable :assembly-routine)))) 945 946;;;; unknown values return 947 948;;; Return a single-value using the Unknown-Values convention. 949;;; 950;;; pfw--get wired-tn conflicts sometimes if register sc specd for args 951;;; having problems targeting args to regs -- using temps instead. 952;;; 953;;; First off, modifying the return-pc defeats the branch-prediction 954;;; optimizations on modern CPUs quite handily. Second, we can do all 955;;; this without needing a temp register. Fixed the latter, at least. 956;;; -- AB 2006/Feb/04 957(define-vop (return-single) 958 (:args (old-fp) 959 (return-pc) 960 (value)) 961 (:ignore value) 962 (:generator 6 963 (check-ocfp-and-return-pc old-fp return-pc) 964 ;; Drop stack above old-fp 965 (inst mov esp-tn ebp-tn) 966 ;; Clear the multiple-value return flag 967 (inst clc) 968 ;; Restore the old frame pointer 969 (inst pop ebp-tn) 970 ;; And return. 971 (inst ret))) 972 973;;; Do unknown-values return of a fixed (other than 1) number of 974;;; values. The VALUES are required to be set up in the standard 975;;; passing locations. NVALS is the number of values returned. 976;;; 977;;; Basically, we just load ECX with the number of values returned and 978;;; EBX with a pointer to the values, set ESP to point to the end of 979;;; the values, and jump directly to return-pc. 980(define-vop (return) 981 (:args (old-fp) 982 (return-pc :to (:eval 1)) 983 (values :more t)) 984 (:ignore values) 985 (:info nvals) 986 ;; In the case of other than one value, we need these registers to 987 ;; tell the caller where they are and how many there are. 988 (:temporary (:sc unsigned-reg :offset ebx-offset) ebx) 989 (:temporary (:sc unsigned-reg :offset ecx-offset) ecx) 990 ;; We need to stretch the lifetime of return-pc past the argument 991 ;; registers so that we can default the argument registers without 992 ;; trashing return-pc. 993 (:temporary (:sc unsigned-reg :offset (first *register-arg-offsets*) 994 :from :eval) a0) 995 (:temporary (:sc unsigned-reg :offset (second *register-arg-offsets*) 996 :from :eval) a1) 997 (:temporary (:sc unsigned-reg :offset (third *register-arg-offsets*) 998 :from :eval) a2) 999 1000 (:generator 6 1001 (check-ocfp-and-return-pc old-fp return-pc) 1002 (when (= nvals 1) 1003 ;; This is handled in RETURN-SINGLE. 1004 (error "nvalues is 1")) 1005 ;; Establish the values pointer and values count. 1006 (inst lea ebx (make-ea :dword :base ebp-tn 1007 :disp (* sp->fp-offset n-word-bytes))) 1008 (if (zerop nvals) 1009 (inst xor ecx ecx) ; smaller 1010 (inst mov ecx (fixnumize nvals))) 1011 ;; Pre-default any argument register that need it. 1012 (when (< nvals register-arg-count) 1013 (let* ((arg-tns (nthcdr nvals (list a0 a1 a2))) 1014 (first (first arg-tns))) 1015 (inst mov first nil-value) 1016 (dolist (tn (cdr arg-tns)) 1017 (inst mov tn first)))) 1018 ;; Set the multiple value return flag. 1019 (inst stc) 1020 ;; And away we go. Except that return-pc is still on the 1021 ;; stack and we've changed the stack pointer. So we have to 1022 ;; tell it to index off of EBX instead of EBP. 1023 (cond ((<= nvals register-arg-count) 1024 (inst mov esp-tn ebp-tn) 1025 (inst pop ebp-tn) 1026 (inst ret)) 1027 (t 1028 ;; Some values are on the stack after RETURN-PC and OLD-FP, 1029 ;; can't return normally and some slots of the frame will 1030 ;; be used as temporaries by the receiver. 1031 ;; 1032 ;; Clear as much of the stack as possible, but not past the 1033 ;; old frame address. 1034 (inst lea esp-tn 1035 (make-ea :dword :base ebp-tn 1036 :disp (frame-byte-offset (1- nvals)))) 1037 (move ebp-tn old-fp) 1038 (inst push (make-ea :dword :base ebx 1039 :disp (frame-byte-offset 1040 (+ sp->fp-offset 1041 (tn-offset return-pc))))) 1042 (inst ret))))) 1043 1044;;; Do unknown-values return of an arbitrary number of values (passed 1045;;; on the stack.) We check for the common case of a single return 1046;;; value, and do that inline using the normal single value return 1047;;; convention. Otherwise, we branch off to code that calls an 1048;;; assembly-routine. 1049;;; 1050;;; The assembly routine takes the following args: 1051;;; ECX -- number of values to find there. 1052;;; ESI -- pointer to where to find the values. 1053(define-vop (return-multiple) 1054 (:args (old-fp) 1055 (return-pc) 1056 (vals :scs (any-reg) :target esi) 1057 (nvals :scs (any-reg) :target ecx)) 1058 (:temporary (:sc unsigned-reg :offset esi-offset :from (:argument 2)) esi) 1059 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 3)) ecx) 1060 (:temporary (:sc descriptor-reg :offset (first *register-arg-offsets*) 1061 :from (:eval 0)) a0) 1062 (:node-var node) 1063 (:generator 13 1064 (check-ocfp-and-return-pc old-fp return-pc) 1065 (unless (policy node (> space speed)) 1066 ;; Check for the single case. 1067 (let ((not-single (gen-label))) 1068 (inst cmp nvals (fixnumize 1)) 1069 (inst jmp :ne not-single) 1070 ;; Return with one value. 1071 (loadw a0 vals -1) 1072 ;; Clear the stack until ocfp. 1073 (inst mov esp-tn ebp-tn) 1074 ;; clear the multiple-value return flag 1075 (inst clc) 1076 ;; Out of here. 1077 (inst pop ebp-tn) 1078 (inst ret) 1079 ;; Nope, not the single case. Jump to the assembly routine. 1080 (emit-label not-single))) 1081 (move esi vals) 1082 (move ecx nvals) 1083 (inst jmp (make-fixup 'return-multiple :assembly-routine)))) 1084 1085;;;; XEP hackery 1086 1087;;; Get the lexical environment from its passing location. 1088(define-vop (setup-closure-environment) 1089 (:results (closure :scs (descriptor-reg))) 1090 (:info label) 1091 (:ignore label) 1092 (:generator 6 1093 ;; Get result. 1094 (move closure eax-tn))) 1095 1096;;; Copy a &MORE arg from the argument area to the end of the current 1097;;; frame. FIXED is the number of non-&MORE arguments. 1098;;; 1099;;; The tricky part is doing this without trashing any of the calling 1100;;; convention registers that are still needed. This vop is emitted 1101;;; directly after the xep-allocate frame. That means the registers 1102;;; are in use as follows: 1103;;; 1104;;; EAX -- The lexenv. 1105;;; EBX -- Available. 1106;;; ECX -- The total number of arguments * N-WORD-BYTES. 1107;;; EDX -- The first arg. 1108;;; EDI -- The second arg. 1109;;; ESI -- The third arg. 1110;;; 1111;;; So basically, we have one register available for our use: EBX. 1112;;; 1113;;; What we can do is push the other regs onto the stack, and then 1114;;; restore their values by looking directly below where we put the 1115;;; more-args. 1116(define-vop (copy-more-arg) 1117 (:info fixed) 1118 (:generator 20 1119 ;; Avoid the copy if there are no more args. 1120 (cond ((zerop fixed) 1121 (inst jecxz JUST-ALLOC-FRAME)) 1122 (t 1123 (inst cmp ecx-tn (fixnumize fixed)) 1124 (inst jmp :be JUST-ALLOC-FRAME))) 1125 1126 ;; Allocate the space on the stack. 1127 ;; stack = ebp + sp->fp-offset - (max 3 frame-size) - (nargs - fixed) 1128 ;; 1129 ;; Problem: this might leave some &more args outside esp, so 1130 ;; clamp the movement for now. If fixed > frame-size, reset 1131 ;; esp to the end of the current &more args (which *should* 1132 ;; be a noop?), and only set esp to its final value after the 1133 ;; stack-stack memmove loop. Otherwise, an unlucky signal 1134 ;; could end up overwriting the &more arguments before they're 1135 ;; moved in their final place. 1136 (inst lea ebx-tn 1137 (make-ea :dword :base ebp-tn 1138 :disp (* n-word-bytes 1139 (- sp->fp-offset 1140 (max 0 1141 (- (max 3 (sb-allocated-size 'stack)) 1142 fixed)))))) 1143 (inst sub ebx-tn ecx-tn) ; Got the new stack in ebx 1144 (inst mov esp-tn ebx-tn) 1145 1146 ;; Now: nargs>=1 && nargs>fixed 1147 1148 ;; Save the original count of args. 1149 (inst mov ebx-tn ecx-tn) 1150 1151 (cond ((< fixed register-arg-count) 1152 ;; We must stop when we run out of stack args, not when we 1153 ;; run out of more args. 1154 ;; Number to copy = nargs-3 1155 (inst sub ecx-tn (fixnumize register-arg-count)) 1156 ;; Everything of interest in registers. 1157 (inst jmp :be DO-REGS)) 1158 (t 1159 ;; Number to copy = nargs-fixed 1160 (inst sub ecx-tn (fixnumize fixed)))) 1161 1162 (let ((delta (* n-word-bytes 1163 (- (max 3 (sb-allocated-size 'stack)) 1164 fixed))) 1165 (LOOP (gen-label))) 1166 (cond ((zerop delta) 1167 ;; nothing to move! 1168 ) 1169 ((minusp delta) 1170 ;; stack frame smaller than fixed; moving args to higher 1171 ;; addresses (stack grows downard), so copy from the 1172 ;; end. Moreover, because we'd have to shrink the frame, 1173 ;; esp currently points at the end of the source args. 1174 (inst push ebx-tn) 1175 1176 (emit-label LOOP) 1177 (inst sub ecx-tn n-word-bytes) 1178 (inst mov ebx-tn (make-ea :dword 1179 :base esp-tn :index ecx-tn 1180 ;; compensate for PUSH above 1181 :disp n-word-bytes)) 1182 (inst mov (make-ea :dword 1183 :base esp-tn :index ecx-tn 1184 ;; compensate for PUSH, and 1185 ;; add (abs delta) 1186 :disp (- n-word-bytes delta)) 1187 ebx-tn) 1188 (inst jmp :nz LOOP) 1189 1190 (inst pop ebx-tn)) 1191 ((plusp delta) 1192 ;; stack frame larger than fixed. Moving args to lower 1193 ;; addresses, so copy from the lowest address. esp 1194 ;; already points to the lowest address of the destination. 1195 (inst push ebx-tn) 1196 (inst push esi-tn) 1197 1198 (inst xor ebx-tn ebx-tn) 1199 (emit-label LOOP) 1200 (inst mov esi-tn (make-ea :dword 1201 :base esp-tn :index ebx-tn 1202 ;; PUSHed 2 words 1203 :disp (+ (* 2 n-word-bytes) 1204 delta))) 1205 (inst mov (make-ea :dword 1206 :base esp-tn :index ebx-tn 1207 :disp (* 2 n-word-bytes)) 1208 esi-tn) 1209 (inst add ebx-tn n-word-bytes) 1210 (inst sub ecx-tn n-word-bytes) 1211 (inst jmp :nz LOOP) 1212 1213 (inst pop esi-tn) 1214 (inst pop ebx-tn)))) 1215 DO-REGS 1216 ;; stack can now be set to its final size 1217 (when (< (max 3 (sb-allocated-size 'stack)) fixed) 1218 (inst add esp-tn (* n-word-bytes 1219 (- fixed 1220 (max 3 (sb-allocated-size 'stack)))))) 1221 1222 ;; Restore ECX 1223 (inst mov ecx-tn ebx-tn) 1224 1225 ;; Here: nargs>=1 && nargs>fixed 1226 (when (< fixed register-arg-count) 1227 ;; Now we have to deposit any more args that showed up in 1228 ;; registers. 1229 (do ((i fixed)) 1230 ( nil ) 1231 ;; Store it relative to ebp 1232 (inst mov (make-ea :dword :base ebp-tn 1233 :disp (* n-word-bytes 1234 (- sp->fp-offset 1235 (+ 1 1236 (- i fixed) 1237 (max 3 (sb-allocated-size 1238 'stack)))))) 1239 (nth i *register-arg-tns*)) 1240 1241 (incf i) 1242 (when (>= i register-arg-count) 1243 (return)) 1244 1245 ;; Don't deposit any more than there are. 1246 (if (zerop i) 1247 (inst test ecx-tn ecx-tn) 1248 (inst cmp ecx-tn (fixnumize i))) 1249 (inst jmp :eq DONE))) 1250 1251 (inst jmp DONE) 1252 1253 JUST-ALLOC-FRAME 1254 (inst lea esp-tn 1255 (make-ea :dword :base ebp-tn 1256 :disp (* n-word-bytes 1257 (- sp->fp-offset 1258 (max 3 (sb-allocated-size 'stack)))))) 1259 1260 DONE)) 1261 1262(define-vop (more-kw-arg) 1263 (:translate sb!c::%more-kw-arg) 1264 (:policy :fast-safe) 1265 (:args (object :scs (descriptor-reg) :to (:result 1)) 1266 (index :scs (any-reg immediate) :to (:result 1) :target keyword)) 1267 (:arg-types * tagged-num) 1268 (:results (value :scs (descriptor-reg any-reg)) 1269 (keyword :scs (descriptor-reg any-reg))) 1270 (:result-types * *) 1271 (:generator 4 1272 (sc-case index 1273 (immediate 1274 (inst mov value (make-ea :dword :base object :disp (tn-value index))) 1275 (inst mov keyword (make-ea :dword :base object 1276 :disp (+ (tn-value index) n-word-bytes)))) 1277 (t 1278 (inst mov value (make-ea :dword :base object :index index)) 1279 (inst mov keyword (make-ea :dword :base object :index index 1280 :disp n-word-bytes)))))) 1281 1282(define-vop (more-arg/c) 1283 (:translate sb!c::%more-arg) 1284 (:policy :fast-safe) 1285 (:args (object :scs (descriptor-reg) :to (:result 1))) 1286 (:info index) 1287 (:arg-types * (:constant (signed-byte 32))) 1288 (:results (value :scs (descriptor-reg any-reg))) 1289 (:result-types *) 1290 (:generator 3 1291 (inst mov value (make-ea :dword :base object 1292 :disp (- (* index n-word-bytes)))))) 1293 1294(define-vop (more-arg) 1295 (:translate sb!c::%more-arg) 1296 (:policy :fast-safe) 1297 (:args (object :scs (descriptor-reg) :to (:result 1)) 1298 (index :scs (any-reg) :to (:result 1) :target value)) 1299 (:arg-types * tagged-num) 1300 (:results (value :scs (descriptor-reg any-reg))) 1301 (:result-types *) 1302 (:generator 4 1303 (move value index) 1304 (inst neg value) 1305 (inst mov value (make-ea :dword :base object :index value)))) 1306 1307;;; Turn more arg (context, count) into a list. 1308(define-vop (listify-rest-args) 1309 (:translate %listify-rest-args) 1310 (:policy :safe) 1311 (:args (context :scs (descriptor-reg) :target src) 1312 (count :scs (any-reg) :target ecx)) 1313 (:arg-types * tagged-num) 1314 (:temporary (:sc unsigned-reg :offset esi-offset :from (:argument 0)) src) 1315 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 1)) ecx) 1316 (:temporary (:sc unsigned-reg :offset eax-offset) eax) 1317 (:temporary (:sc unsigned-reg) dst) 1318 (:results (result :scs (descriptor-reg))) 1319 (:node-var node) 1320 (:generator 20 1321 (let ((enter (gen-label)) 1322 (loop (gen-label)) 1323 (done (gen-label)) 1324 (stack-allocate-p (node-stack-allocate-p node))) 1325 (move src context) 1326 (move ecx count) 1327 ;; Check to see whether there are no args, and just return NIL if so. 1328 (inst mov result nil-value) 1329 (inst jecxz done) 1330 (inst lea dst (make-ea :dword :base ecx :index ecx)) 1331 (maybe-pseudo-atomic stack-allocate-p 1332 (allocation dst dst node stack-allocate-p list-pointer-lowtag) 1333 ;; Set decrement mode (successive args at lower addresses) 1334 (inst std) 1335 ;; Set up the result. 1336 (move result dst) 1337 ;; Jump into the middle of the loop, 'cause that's where we want 1338 ;; to start. 1339 (inst jmp enter) 1340 (emit-label loop) 1341 ;; Compute a pointer to the next cons. 1342 (inst add dst (* cons-size n-word-bytes)) 1343 ;; Store a pointer to this cons in the CDR of the previous cons. 1344 (storew dst dst -1 list-pointer-lowtag) 1345 (emit-label enter) 1346 ;; Grab one value and stash it in the car of this cons. 1347 (inst lods eax) 1348 (storew eax dst 0 list-pointer-lowtag) 1349 ;; Go back for more. 1350 (inst sub ecx n-word-bytes) 1351 (inst jmp :nz loop) 1352 ;; NIL out the last cons. 1353 (storew nil-value dst 1 list-pointer-lowtag) 1354 (inst cld)) 1355 (emit-label done)))) 1356 1357;;; Return the location and size of the &MORE arg glob created by 1358;;; COPY-MORE-ARG. SUPPLIED is the total number of arguments supplied 1359;;; (originally passed in ECX). FIXED is the number of non-rest 1360;;; arguments. 1361;;; 1362;;; We must duplicate some of the work done by COPY-MORE-ARG, since at 1363;;; that time the environment is in a pretty brain-damaged state, 1364;;; preventing this info from being returned as values. What we do is 1365;;; compute supplied - fixed, and return a pointer that many words 1366;;; below the current stack top. 1367(define-vop (more-arg-context) 1368 (:policy :fast-safe) 1369 (:translate sb!c::%more-arg-context) 1370 (:args (supplied :scs (any-reg) :target count)) 1371 (:arg-types positive-fixnum (:constant fixnum)) 1372 (:info fixed) 1373 (:results (context :scs (descriptor-reg)) 1374 (count :scs (any-reg))) 1375 (:result-types t tagged-num) 1376 (:note "more-arg-context") 1377 (:generator 5 1378 (move count supplied) 1379 ;; SP at this point points at the last arg pushed. 1380 ;; Point to the first more-arg, not above it. 1381 (inst lea context (make-ea :dword :base esp-tn 1382 :index count :scale 1 1383 :disp (- (+ (fixnumize fixed) n-word-bytes)))) 1384 (unless (zerop fixed) 1385 (inst sub count (fixnumize fixed))))) 1386 1387;;; Signal wrong argument count error if NARGS isn't equal to COUNT. 1388(define-vop (verify-arg-count) 1389 (:policy :fast-safe) 1390 (:args (nargs :scs (any-reg))) 1391 (:arg-types positive-fixnum (:constant t) (:constant t)) 1392 (:info min max) 1393 (:vop-var vop) 1394 (:save-p :compute-only) 1395 (:generator 3 1396 (let ((err-lab 1397 (generate-error-code vop 'invalid-arg-count-error nargs))) 1398 (flet ((check-min () 1399 (cond ((= min 1) 1400 (inst test nargs nargs) 1401 (inst jmp :e err-lab)) 1402 ((plusp min) 1403 (inst cmp nargs (fixnumize min)) 1404 (inst jmp :b err-lab))))) 1405 (cond ((not min) 1406 (if (zerop max) 1407 (inst test nargs nargs) 1408 (inst cmp nargs (fixnumize max))) 1409 (inst jmp :ne err-lab)) 1410 (max 1411 (check-min) 1412 (inst cmp nargs (fixnumize max)) 1413 (inst jmp :a err-lab)) 1414 (t 1415 (check-min))))))) 1416 1417;;; Single-stepping 1418(defun emit-single-step-test () 1419 ;; We use different ways of representing whether stepping is on on 1420 ;; +SB-THREAD / -SB-THREAD: on +SB-THREAD, we use a slot in the 1421 ;; thread structure. On -SB-THREAD we use the value of a static 1422 ;; symbol. Things are done this way, since reading a thread-local 1423 ;; slot from a symbol would require an extra register on +SB-THREAD, 1424 ;; and reading a slot from a thread structure would require an extra 1425 ;; register on -SB-THREAD. 1426 #!+sb-thread 1427 (progn 1428 #!+win32 (inst push eax-tn) 1429 (with-tls-ea (EA :base #!+win32 eax-tn #!-win32 :unused 1430 :disp-type :constant 1431 :disp (* thread-stepping-slot n-word-bytes)) 1432 (inst cmp EA 0 :maybe-fs)) 1433 #!+win32 (inst pop eax-tn)) 1434 #!-sb-thread 1435 (inst cmp (make-ea-for-symbol-value sb!impl::*stepping*) 0)) 1436 1437(define-vop (step-instrument-before-vop) 1438 (:policy :fast-safe) 1439 (:vop-var vop) 1440 (:generator 3 1441 (emit-single-step-test) 1442 (inst jmp :eq DONE) 1443 (inst break single-step-before-trap) 1444 DONE 1445 (note-this-location vop :step-before-vop))) 1446