;; address. Therefore, we need to iterate from larger addresses to
;; smaller addresses. pfw-this says copy ecx words from esi to edi
;; counting down.
- (inst shr ecx 2) ; fixnum to raw word count
- (inst std) ; count down
- (inst sub esi 4) ; ?
+ (inst shr ecx 2) ; fixnum to raw word count
+ (inst std) ; count down
+ (inst sub esi 4) ; ?
(inst lea edi (make-ea :dword :base ebx :disp (- n-word-bytes)))
(inst rep)
(inst movs :dword)
+ (inst cld)
;; Restore the count.
(inst mov ecx edx)
(loadw esi ebx -3)
;; And back we go.
+ (inst stc)
(inst jmp eax)
;; Handle the register arg cases.
(inst mov edx nil-value)
(inst mov edi edx)
(inst mov esi edx)
+ (inst stc)
(inst jmp eax)
ONE-VALUE ; Note: we can get this, because the return-multiple vop
- ; doesn't check for this case when size > speed.
+ ; doesn't check for this case when size > speed.
(loadw edx esi -1)
(inst mov esp-tn ebx)
- (inst add eax 2)
+ (inst clc)
(inst jmp eax)
TWO-VALUES
(loadw edi esi -2)
(inst mov esi nil-value)
(inst lea esp-tn (make-ea :dword :base ebx :disp (* -2 n-word-bytes)))
+ (inst stc)
(inst jmp eax)
THREE-VALUES
(loadw edi esi -2)
(loadw esi esi -3)
(inst lea esp-tn (make-ea :dword :base ebx :disp (* -3 n-word-bytes)))
+ (inst stc)
(inst jmp eax))
\f
;;;; TAIL-CALL-VARIABLE
;; Do the blit. Because we are coping from smaller addresses to
;; larger addresses, we have to start at the largest pair and work
;; our way down.
- (inst shr ecx 2) ; fixnum to raw words
- (inst std) ; count down
+ (inst shr ecx 2) ; fixnum to raw words
+ (inst std) ; count down
(inst lea edi (make-ea :dword :base ebp-tn :disp (- n-word-bytes)))
(inst sub esi (fixnumize 1))
(inst rep)
(inst movs :dword)
+ (inst cld)
;; Load the register arguments carefully.
(loadw edx ebp-tn -1)
;; Restore OLD-FP and ECX.
(inst pop ecx)
- (popw ebp-tn -1) ; overwrites a0
+ (popw ebp-tn -1) ; overwrites a0
;; Blow off the stack above the arguments.
(inst lea esp-tn (make-ea :dword :base edi :disp n-word-bytes))
(inst push ebx)
;; And jump into the function.
- (inst jmp
- (make-ea :byte :base eax
- :disp (- (* closure-fun-slot n-word-bytes)
- fun-pointer-lowtag)))
+ (inst jmp (make-ea-for-object-slot eax closure-fun-slot fun-pointer-lowtag))
;; All the arguments fit in registers, so load them.
REGISTER-ARGS
;; Clear most of the stack.
(inst lea esp-tn
- (make-ea :dword :base ebp-tn :disp (* -3 n-word-bytes)))
+ (make-ea :dword :base ebp-tn :disp (* -3 n-word-bytes)))
;; Push the return-pc so it looks like we just called.
(pushw ebp-tn -2)
;; And away we go.
- (inst jmp (make-ea :byte :base eax
- :disp (- (* closure-fun-slot n-word-bytes)
- fun-pointer-lowtag))))
+ (inst jmp (make-ea-for-object-slot eax closure-fun-slot fun-pointer-lowtag)))
\f
(define-assembly-routine (throw
- (:return-style :none))
- ((:arg target (descriptor-reg any-reg) edx-offset)
- (:arg start any-reg ebx-offset)
- (:arg count any-reg ecx-offset)
- (:temp catch any-reg eax-offset))
+ (:return-style :none))
+ ((:arg target (descriptor-reg any-reg) edx-offset)
+ (:arg start any-reg ebx-offset)
+ (:arg count any-reg ecx-offset)
+ (:temp catch any-reg eax-offset))
(declare (ignore start count))
LOOP
(let ((error (generate-error-code nil unseen-throw-tag-error target)))
- (inst or catch catch) ; check for NULL pointer
+ (inst or catch catch) ; check for NULL pointer
(inst jmp :z error))
(inst cmp target (make-ea-for-object-slot catch catch-block-tag-slot 0))
;;;; non-local exit noise
+#!-win32
(define-assembly-routine (unwind
- (:return-style :none)
- (:translate %continue-unwind)
- (:policy :fast-safe))
- ((:arg block (any-reg descriptor-reg) eax-offset)
- (:arg start (any-reg descriptor-reg) ebx-offset)
- (:arg count (any-reg descriptor-reg) ecx-offset)
- (:temp uwp unsigned-reg esi-offset))
+ (:return-style :none)
+ (:translate %continue-unwind)
+ (:policy :fast-safe))
+ ((:arg block (any-reg descriptor-reg) eax-offset)
+ (:arg start (any-reg descriptor-reg) ebx-offset)
+ (:arg count (any-reg descriptor-reg) ecx-offset)
+ (:temp uwp unsigned-reg esi-offset))
(declare (ignore start count))
(let ((error (generate-error-code nil invalid-unwind-error)))
- (inst or block block) ; check for NULL pointer
+ (inst or block block) ; check for NULL pointer
(inst jmp :z error))
(load-tl-symbol-value uwp *current-unwind-protect-block*)
;; Does *CURRENT-UNWIND-PROTECT-BLOCK* match the value stored in
;; argument's CURRENT-UWP-SLOT?
(inst cmp uwp
- (make-ea-for-object-slot block unwind-block-current-uwp-slot 0))
+ (make-ea-for-object-slot block unwind-block-current-uwp-slot 0))
;; If a match, return to context in arg block.
(inst jmp :e do-exit)
;; be saved on the stack: the block in edx-tn, start in ebx-tn, and
;; count in ecx-tn.
- (inst jmp (make-ea :byte :base block
- :disp (* unwind-block-entry-pc-slot n-word-bytes))))
+ (inst jmp (make-ea-for-object-slot block unwind-block-entry-pc-slot 0)))
+
+
+;;;; Win32 non-local exit noise
+
+#!+win32
+(define-assembly-routine (unwind
+ (:return-style :none)
+ (:policy :fast-safe))
+ ((:arg block (any-reg descriptor-reg) eax-offset)
+ (:arg start (any-reg descriptor-reg) ebx-offset)
+ (:arg count (any-reg descriptor-reg) ecx-offset))
+ (declare (ignore start count))
+
+ (let ((error (generate-error-code nil invalid-unwind-error)))
+ (inst or block block) ; check for NULL pointer
+ (inst jmp :z error))
+
+ ;; Save all our registers, as we're about to clobber them.
+ (inst pusha)
+
+ ;; Find the SEH frame surrounding our target.
+ (loadw ecx-tn block unwind-block-next-seh-frame-slot)
+
+ ;; This section copied from VOP CALL-OUT.
+ ;; Setup the NPX for C; all the FP registers need to be
+ ;; empty; pop them all.
+ (dotimes (i 8)
+ (inst fstp fr0-tn))
+
+ ;; I'm unlikely to ever forget this again.
+ (inst cld)
+
+ ;; Set up a bogus stack frame for RtlUnwind to pick its return
+ ;; address from. (Yes, this is how RtlUnwind works.)
+ (inst push (make-fixup 'win32-unwind-tail :assembly-routine))
+ (inst push ebp-tn)
+ (inst mov ebp-tn esp-tn)
+
+ ;; Actually call out for the unwind.
+ (inst push 0)
+ (inst push 0)
+ (inst push 0)
+ (inst push ecx-tn)
+ (inst call (make-fixup "RtlUnwind@16" :foreign)))
+
+;; We want no VOP for this one and for it to only happen on Win32
+;; targets. Hence the following disaster.
+#!+#.(cl:if (cl:member sb-assembling cl:*features*) win32 '(or))
+(define-assembly-routine
+ (win32-unwind-tail (:return-style :none))
+ ((:temp block unsigned-reg eax-offset))
+
+ ;; The unwind returns here. Had to use a VOP for this because
+ ;; PUSH won't accept a label as an argument.
+
+ ;; Clean up the bogus stack frame we pushed for the unwind.
+ (inst pop ebp-tn)
+ (inst pop esi-tn) ;; Random scratch register.
+
+ ;; This section based on VOP CALL-OUT.
+ ;; Restore the NPX for lisp; ensure no regs are empty
+ (dotimes (i 8)
+ (inst fldz))
+
+ ;; Restore our regs.
+ (inst popa)
+
+ ;; By now we've unwound all the UWP frames required, so we
+ ;; just jump to our target block.
+ (loadw ebp-tn block unwind-block-current-cont-slot)
+
+ ;; Nlx-entry expects the arg start in ebx-tn and the arg count
+ ;; in ecx-tn. Fortunately, that's where they are already.
+ (inst jmp (make-ea-for-object-slot block unwind-block-entry-pc-slot 0)))
+
+
+;;;; Win32 UWP block SEH interface.
+
+;; We want no VOP for this one and for it to only happen on Win32
+;; targets. Hence the following disaster.
+#!+#.(cl:if (cl:member sb-assembling cl:*features*) win32 '(or))
+(define-assembly-routine
+ (uwp-seh-handler (:return-style :none))
+ ((:temp block unsigned-reg eax-offset))
+
+ ;; We get called for any exception which happens within our
+ ;; dynamic contour that isn't handled below us, and for
+ ;; unwinding.
+
+ ;; For the exceptions we just return ExceptionContinueSearch.
+
+ ;; Find the exception record.
+ (inst mov eax-tn (make-ea :dword :base esp-tn :disp 4))
+
+ ;; Check unwind flags.
+ (inst test (make-ea :byte :base eax-tn :disp 4) 6) ; EH_UNWINDING | EH_EXIT_UNWIND
+
+ ;; To see if we're unwinding or not.
+ (inst jmp :nz UNWINDING)
+
+ ;; We're not unwinding, so we're not interested.
+ (inst mov eax-tn 1) ;; exception-continue-search
+ (inst ret)
+
+ ;; For the unwinds we establish a basic environment as per
+ ;; call_into_lisp, but without the extra SEH frame (the theory
+ ;; being that we're already in a Lisp SEH context), and invoke
+ ;; our UWP block to unwind itself.
+
+ ;; FIXME: Do we need to establish an SEH frame anyway? And do
+ ;; we need to do the same stack frame hackery for the debugger
+ ;; as we do for the main exception handler?
+
+ ;; When the UWP block calls %continue-unwind, we come back to
+ ;; the next assembly routine, below, which reinitializes for C
+ ;; and returns to the Win32 unwind machinery.
+
+ ;; If the UWP block sees fit to do a non-local exit, things
+ ;; Just Work, thanks to the Win32 API being sanely designed
+ ;; and our complying with it.
+
+ ;; We also must update *current-unwind-protect-block* before
+ ;; calling the cleanup function.
+
+ UNWINDING
+
+ ;; Save all registers (overkill)
+ (inst pusha)
+
+ ;; Establish our stack frame.
+ (inst mov ebp-tn esp-tn)
+
+ ;; This section based on VOP CALL-OUT.
+ ;; Restore the NPX for lisp; ensure no regs are empty
+ (dotimes (i 8)
+ (inst fldz))
+
+ ;; Find our unwind-block by way of our SEH frame.
+ (inst mov block (make-ea :dword :base ebp-tn :disp #x28))
+ (inst lea block (make-ea :dword :base block
+ :disp (- (* unwind-block-next-seh-frame-slot
+ n-word-bytes))))
+
+ ;; Update *CURRENT-UNWIND-PROTECT-BLOCK*.
+ (loadw ebx-tn block unwind-block-current-uwp-slot)
+ (store-tl-symbol-value ebx-tn *current-unwind-protect-block* ecx-tn)
+
+ ;; Uwp-entry expects some things in known locations so that they can
+ ;; be saved on the stack: the block in edx-tn, start in ebx-tn, and
+ ;; count in ecx-tn. We don't actually have any of that here, but we
+ ;; do need to have access to our own stack frame, so we hijack the
+ ;; known locations to cover our own state.
+
+ (inst xor ebx-tn ebx-tn)
+ (inst xor ecx-tn ecx-tn)
+ (inst mov ebx-tn ebp-tn)
+ (loadw ebp-tn block unwind-block-current-cont-slot)
+ (inst jmp (make-ea-for-object-slot block unwind-block-entry-pc-slot 0)))
+
+#!+win32
+(define-assembly-routine (continue-unwind
+ (:return-style :none)
+ (:translate %continue-unwind)
+ (:policy :fast-safe))
+ ((:arg block (any-reg descriptor-reg) eax-offset)
+ (:arg start (any-reg descriptor-reg) ebx-offset)
+ (:arg count (any-reg descriptor-reg) ecx-offset))
+ (declare (ignore block count))
+ ;; The args here are mostly ignored because we're using the
+ ;; win32 unwind mechanism and keep all that elsewhere. The
+ ;; exception is START, which we use to pass the saved EBP for
+ ;; our exception handler.
+
+ ;; "All" we have to do here is reload our EBP, reestablish a C
+ ;; environment, and return ExceptionContinueSearch. The OS
+ ;; handles the rest.
+
+ ;; Restore our frame pointer.
+ (inst mov esp-tn start)
+
+ ;; This section copied from VOP CALL-OUT.
+ ;; Setup the NPX for C; all the FP registers need to be
+ ;; empty; pop them all.
+ (dotimes (i 8)
+ (inst fstp fr0-tn))
+
+ ;; I'm unlikely to ever forget this again.
+ (inst cld)
+
+ ;; Restore our saved registers
+ (inst popa)
+
+ ;; And we're done.
+ (inst mov eax-tn 1) ;; exception-continue-search
+ (inst ret))
projects / sbcl.git / blobdiff