[Webkit-unassigned] [Bug 44329] SH4 JIT SUPPORT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44329





--- Comment #42 from Eduardo Felipe Castegnaro <edufelipe at e3c.com.br>  2010-12-13 07:22:31 PST ---
(In reply to comment #39)
> Created an attachment (id=76199)
 --> (https://bugs.webkit.org/attachment.cgi?id=76199&action=review) [details]
> JIT support JSValue32-64
> 
> Hi,
> 
> Attached new patche to add JIT support for revision 71224 for webkit version 1.3.5 supporting JSVALUE32_64.

Were you able to successfully run this patch by just downloading the SVN revision 71224 and applying the constant pool patch?

Your patch applies cleanly, but builds with two warnings (signed-unsigned comparison and no return in function returning value) and I get segmentation fault on the JavaScript shell application (jsc) when it finds something that can be JITed (like loops with mathematical expressions inside them).

Debugging let me to believe that this is happening due to JIT code putting code not at 32 bit boundaries.

Here is what I'm getting:

bash-3.00# jsc
> a = 5;
5
> a
5
> for (count=1; count<=100; count=count+1) { a = a + count; }
Unaligned userspace access in "jsc" pid=851 pc=0x2b48ae24 ins=0x6332
Sending SIGBUS to "jsc" due to unaligned access (PC 2b48ae24 PR 2968f85a)

The kernel on STLinux has this comment on the function that handles unaligned accesses:

fixup:
        /* unaligned PC is not something we can fix */
        if (regs->pc & 1) {
            si_code = BUS_ADRALN;
            goto uspace_segv;
        }

[...]

uspace_segv:
        printk(KERN_NOTICE "Sending SIGBUS to \"%s\" due to unaligned "
               "access (PC %lx PR %lx)\n", current->comm, regs->pc,
               regs->pr);


Has anyone seen a different behavior with this patch?

Best regards,

Eduardo.

> Regards,
> Thouraya.

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