https://sourceware.org/bugzilla/show_bug.cgi?id=19410
Bug ID: 19410
Summary: gold doesn't transform blx to bl in ARM code
Product: binutils
Version: 2.27 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: loic.yhuel at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
ld.bfd (both in ARM and Thumb code), and ld.gold (in Thumb code) are able to
choose between bl and blx depending on the target address.
But in ARM code, ld.gold is only able to transform bl into blx, and not the
opposite.
echo "void fn(void) {}" | arm-linux-gnueabihf-gcc -marm -c -o called.o -xc -
echo "\t.arm\ncaller:\n\tblx fn" | arm-linux-gnueabihf-as -o caller.o
arm-linux-ld.gold -o gold.out caller.o called.o
arm-linux-ld.bfd -o bfd.out caller.o called.o
arm-linux-gnueabihf-objdump -d gold.out
...
00008094 <caller>:
8094: faffffff blx 8098 <fn>
...
arm-linux-gnueabihf-objdump -d bfd.out
...
00010074 <caller>:
10074: ebffffff bl 10078 <fn>
...
It makes WebKit crash when compiling in ARM mode and linking with gold, due to
https://github.com/WebKit/webkit/blob/master/Source/JavaScriptCore/offlineasm/arm.rb#L570.
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