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3 Commits

Author SHA1 Message Date
Akira Hatanaka 2ee0e9e6ee [ARM, stack protector] If supported, use armv7 instructions. 
This commit enables using movt/movw to load the stack guard address:

movw r0, :lower16:(L_g3$non_lazy_ptr-(LPC0_0+8))
movt r0, :upper16:(L_g3$non_lazy_ptr-(LPC0_0+8))
ldr r0, [pc, r0]

Previously a pc-relative load was emitted:

ldr r0, LCPI0_0
ldr r0, [pc, r0]

rdar://problem/18740489

llvm-svn: 220470
 2014-10-23 04:17:05 +00:00
Akira Hatanaka dc08c30df9 [ARM] In dynamic-no-pic mode, ARM's post-RA pseudo expansion was incorrectly 
expanding pseudo LOAD_STATCK_GUARD using instructions that are normally used
in pic mode. This patch fixes the bug.

<rdar://problem/17886592>

llvm-svn: 214614
 2014-08-02 05:40:40 +00:00
Akira Hatanaka e5b6e0d231 [stack protector] Fix a potential security bug in stack protector where the 
address of the stack guard was being spilled to the stack.

Previously the address of the stack guard would get spilled to the stack if it
was impossible to keep it in a register. This patch introduces a new target
independent node and pseudo instruction which gets expanded post-RA to a
sequence of instructions that load the stack guard value. Register allocator
can now just remat the value when it can't keep it in a register. 

<rdar://problem/12475629>

llvm-svn: 213967
 2014-07-25 19:31:34 +00:00