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From: "adhemerval.zanella at linaro dot org"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/31266] New: sparc: string/tst-memmove-overflow fails on
 32-bit sparcv9
Date: Thu, 18 Jan 2024 15:28:06 +0000
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X-Bugzilla-Component: string
X-Bugzilla-Version: 2.27
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31266

            Bug ID: 31266
           Summary: sparc: string/tst-memmove-overflow fails on 32-bit
                    sparcv9
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: string
          Assignee: unassigned at sourceware dot org
          Reporter: adhemerval.zanella at linaro dot org
  Target Milestone: ---

The sparcv9 uses the generic sparc64 sysdeps/sparc/sparc64/memmove.S
implementation and the initial size test is done with a signed comparison:

ENTRY(memmove)
        mov     %o0, %g2        /* Save pointer to destination  */
        cmp     %o1, %o0        /* if from address is >=3D to use forward c=
opy=20
*/
        bgeu,a  %XCC, 2f        /* else use backward if ...  */
         cmp    %o2, 17         /* delay slot, for small counts copy bytes =
 */

        sub     %o0, %o1, %o4   /* get difference of two addresses  */
        cmp     %o2, %o4        /* compare size and difference of addresses=
  */
        bgu     %XCC, .Lovbc    /* if size is bigger, have to do overlapped
copy  */
         cmp    %o2, 17         /* delay slot, for small counts copy bytes =
 */
/*
 * normal, copy forwards
 */
2:      ble    %XCC, .Ldbytecp
         andcc  %o1, 3, %o5     /* is src word aligned  */

Where it should be a 'bleu' due the buffer length being a size_t.

--=20
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