Bug 149619 – [ARM] REGRESSION(r190289): It made 374 tests crash on 32 bit ARM Linux

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Csaba Osztrogonác]

https://trac.webkit.org/changeset/190289 made 374 tests crash on 32 bit ARM Linux platforms. (81 different tests)

EFL ARMv7 Thumb2 instructuon set: https://build.webkit.org/builders/EFL%20Linux%20ARMv7%20Thumb2%20Release/builds/15412
EFL ARMv7 "traditional" ARM instruction set: https://build.webkit.org/builders/EFL%20Linux%20ARMv7%20Traditional%20Release/builds/15278
GTK ARM "whatever": https://build.webkit.org/builders/GTK%20Linux%20ARM%20Release/builds/8640

[Alexey Proskuryakov]

Should this be duped to bug 149647 now (the rollout bug)?

[Michael Saboff]

I think I found the issue.  In LowLevelAssembler.asm, the macro prepareForTailCall had the following construct:

    if ARM or SH4 or ARM64 or C_LOOP or MIPS
        addp 2 * PtrSize, sp
        subi 2 * PtrSize, temp2
        loadp PtrSize[cfr], lr
    else
        addp PtrSize, sp
        subi PtrSize, temp2
        loadp PtrSize[cfr], temp3
        storep temp3, [sp]
    end

The "if ARM or SH4 ..." case accounts for having a link register.  The problem is that this if should also take into account the other ARM variants.  It should read:
    if ARM or ARMv7_TRADITIONAL or ARMv7 or SH4 or ARM64 or C_LOOP or MIPS

Running all JSC regression tests now.

[Michael Saboff]

Created attachment 262191 [details]
Patch

[Michael Saboff]

Landed as part of change set r190370: <http://trac.webkit.org/changeset/190370>.