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- Log ----------------------------------------------------------------- commit 5e57578ad6f1d02d86379986f79755e993ce2c72 Author: Raymond Toy toy.raymond@gmail.com Date: Tue Jul 17 19:35:23 2012 -0700

Fix possible stack corruption caused by possibly not allocating enough stack space to hold the SSE2 state. (Forgot to add extra bytes for 16-byte alignment!)

diff --git a/src/lisp/x86-assem.S b/src/lisp/x86-assem.S index 34c1ef0..57b69c0 100644 --- a/src/lisp/x86-assem.S +++ b/src/lisp/x86-assem.S @@ -172,7 +172,11 @@ FUNCDEF(call_into_lisp) cmp $2, %eax # SSE2 mode? jne x87_save movl %esp, %eax # Remember the current stack pointer - subl $512,%esp # Make room for the SSE state + /* + * The SSE state is 512 bytes, but we need 16 more because we + * need 16-byte alignment. + */ + subl $512+16,%esp andl $-16, %esp # fxsave needs 16-byte alignment fxsave (%esp) pushl %eax # Save the old stack pointer @@ -194,7 +198,7 @@ x87_save: fldcw (%esp) # Recover modes popl %eax npx_save_done: - + /* Is this still necessary with sse2? */ fldz # insure no FP regs are empty fldz fldz

commit ea2dae80bcc9be55607ce8d9b62c268db53e98c5 Author: Raymond Toy toy.raymond@gmail.com Date: Tue Jul 17 19:32:17 2012 -0700

Clean up and correct some comments.

diff --git a/src/compiler/x86/macros.lisp b/src/compiler/x86/macros.lisp index 21b68e4..ca2c267 100644 --- a/src/compiler/x86/macros.lisp +++ b/src/compiler/x86/macros.lisp @@ -140,22 +140,25 @@ (defun inline-allocation (alloc-tn size) (let ((ok (gen-label)) (done (gen-label))) - ;; + ;; Load the size first so that the size can be in the same ;; register as alloc-tn. (load-size alloc-tn alloc-tn size) - ;; + + ;; Try inline allocation, incrementing the + ;; current-region-free-pointer by the size. If we didn't pass the + ;; end of the region, then inline allocation succeeded, and we're + ;; done. (inst add alloc-tn (make-symbol-value-ea '*current-region-free-pointer*)) (inst cmp alloc-tn (make-symbol-value-ea '*current-region-end-addr*)) (inst jmp :be OK)

- ;; Inline allocation didn't work so we need to call alloc, carefully. - - ;; Recompute the size. Can't just reload size because it might - ;; have already been destroyed if size = alloc-tn (which does - ;; happen). + ;; Inline allocation didn't work so we need to call alloc, + ;; carefully. Need to recompute the size because we can't just + ;; reload size because it might have already been destroyed if + ;; size = alloc-tn (which does happen). (inst sub alloc-tn (make-symbol-value-ea '*current-region-free-pointer*)) (case (tn-offset alloc-tn) (#.eax-offset @@ -169,7 +172,7 @@ (inst call (make-fixup (extern-alien-name #-sse2 "alloc_overflow_x87" #+sse2 "alloc_overflow_sse2") :foreign)) - (inst mov alloc-tn eax-tn) ; Save allocated address in alloc-tn + (inst mov alloc-tn eax-tn) ; Put allocated address in alloc-tn (inst pop eax-tn) ; Restore old value of eax (inst jmp done))) @@ -181,8 +184,7 @@ (values))

(defun not-inline-allocation (alloc-tn size) - ;; C call to allocate via dispatch routines. Each destination has a - ;; special entry point. The size may be a register or a constant. + ;; C call to allocate. The size may be a register or a constant. (load-size alloc-tn alloc-tn size) (case (tn-offset alloc-tn) (#.eax-offset diff --git a/src/lisp/x86-assem.S b/src/lisp/x86-assem.S index 9583e84..34c1ef0 100644 --- a/src/lisp/x86-assem.S +++ b/src/lisp/x86-assem.S @@ -484,7 +484,7 @@ FUNCDEF(alloc_overflow_sse2) movl %ecx, 8(%esp) # Save ecx and edx registers movl %edx, 4(%esp) stmxcsr 12(%esp) # Save MXCSR - /* Clear the exceptions that might occurred */ + /* Clear the exceptions that might have occurred */ movl 12(%esp), %edx and $-64, %edx # Clear the exceptions movl %edx, 16(%esp)

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Summary of changes: src/compiler/x86/macros.lisp | 22 ++++++++++++---------- src/lisp/x86-assem.S | 10 +++++++--- 2 files changed, 19 insertions(+), 13 deletions(-)

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