[Bug 789198]

[derf]

Comment on attachment 542230
Enforce alignment for ARM code in Thumb mode in libvpx

># HG changeset patch
># User Timothy B. Terriberry <tterribe at vt.edu>
># Date 1309201530 25200
># Node ID 1e745d4b39c8f8d7ffb3d4b8cdd7fafce68c5349
># Parent  e338daa71bc2fdb9c05a276ef1a477e1730f0aca
>Bug 666931 - Enforce alignment for ARM code in Thumb mode in libvpx
>
>diff --git a/media/libvpx/build/make/ads2gas.pl b/media/libvpx/build/make/ads2gas.pl
>--- a/media/libvpx/build/make/ads2gas.pl
>+++ b/media/libvpx/build/make/ads2gas.pl
>@@ -74,17 +74,20 @@ while (<STDIN>)
> 
>     # Convert INCLUDE to .INCLUDE "file"
>     s/INCLUDE(\s*)(.*)$/.include $1\"$2\"/;
> 
>     # Code directive (ARM vs Thumb)
>     s/CODE([0-9][0-9])/.code $1/;
> 
>     # No AREA required
>-    s/^\s*AREA.*$/.text/;
>+    # But ALIGNs in AREA must be obeyed
>+    s/^\s*AREA.*ALIGN=([0-9])$/.text\n.p2align $1/;
>+    # If no ALIGN, strip the AREA and align to 4 bytes
>+    s/^\s*AREA.*$/.text\n.p2align 2/;
> 
>     # DCD to .word
>     # This one is for incoming symbols
>     s/DCD\s+\|(\w*)\|/.long $1/;
> 
>     # DCW to .short
>     s/DCW\s+\|(\w*)\|/.short $1/;
>     s/DCW(.*)/.short $1/;
>diff --git a/media/libvpx/update.sh b/media/libvpx/update.sh
>--- a/media/libvpx/update.sh
>+++ b/media/libvpx/update.sh
>@@ -321,8 +321,11 @@ patch -p3 < solaris.patch
> # Patch to fix link with xcode4
> patch -p1 < xcode4.patch
> 
> # Patch to fix data race on global function pointers
> patch -p3 < bug640935.patch
> 
> # Patch to avoid text relocations on ARM
> patch -p3 < bug646815.patch
>+
>+# Patch to fix alignment problems with using ARM asm in Thumb mode.
>+patch -p3 < bug666931.patch

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https://bugs.launchpad.net/bugs/789198

Title:
  Firefox crashes when attempting to play webm video on ARM with Thumb2
  enabled

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