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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-06-30 15:29:12 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-07-18 11:29:04 (GMT)
commit6ebbf2ce437b33022d30badd49dc94d33ecfa498 (patch)
treebc015e35b456a28bb0e501803a454dc0c0d3291a /arch/arm/nwfpe
parentaf040ffc9ba1e079ee4c0748aff64fa3d4716fa5 (diff)
downloadlinux-6ebbf2ce437b33022d30badd49dc94d33ecfa498.tar.xz
ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+
ARMv6 and greater introduced a new instruction ("bx") which can be used to return from function calls. Recent CPUs perform better when the "bx lr" instruction is used rather than the "mov pc, lr" instruction, and this sequence is strongly recommended to be used by the ARM architecture manual (section A.4.1.1). We provide a new macro "ret" with all its variants for the condition code which will resolve to the appropriate instruction. Rather than doing this piecemeal, and miss some instances, change all the "mov pc" instances to use the new macro, with the exception of the "movs" instruction and the kprobes code. This allows us to detect the "mov pc, lr" case and fix it up - and also gives us the possibility of deploying this for other registers depending on the CPU selection. Reported-by: Will Deacon <will.deacon@arm.com> Tested-by: Stephen Warren <swarren@nvidia.com> # Tegra Jetson TK1 Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> # mioa701_bootresume.S Tested-by: Andrew Lunn <andrew@lunn.ch> # Kirkwood Tested-by: Shawn Guo <shawn.guo@freescale.com> Tested-by: Tony Lindgren <tony@atomide.com> # OMAPs Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> # Armada XP, 375, 385 Acked-by: Sekhar Nori <nsekhar@ti.com> # DaVinci Acked-by: Christoffer Dall <christoffer.dall@linaro.org> # kvm/hyp Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> # PXA3xx Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> # Xen Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> # ARMv7M Tested-by: Simon Horman <horms+renesas@verge.net.au> # Shmobile Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/nwfpe')
-rw-r--r--arch/arm/nwfpe/entry.S8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/nwfpe/entry.S b/arch/arm/nwfpe/entry.S
index d18dde9..5d65be1 100644
--- a/arch/arm/nwfpe/entry.S
+++ b/arch/arm/nwfpe/entry.S
@@ -19,7 +19,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-
+#include <asm/assembler.h>
#include <asm/opcodes.h>
/* This is the kernel's entry point into the floating point emulator.
@@ -92,7 +92,7 @@ emulate:
mov r0, r6 @ prepare for EmulateAll()
bl EmulateAll @ emulate the instruction
cmp r0, #0 @ was emulation successful
- moveq pc, r4 @ no, return failure
+ reteq r4 @ no, return failure
next:
.Lx1: ldrt r6, [r5], #4 @ get the next instruction and
@@ -102,7 +102,7 @@ next:
teq r2, #0x0C000000
teqne r2, #0x0D000000
teqne r2, #0x0E000000
- movne pc, r9 @ return ok if not a fp insn
+ retne r9 @ return ok if not a fp insn
str r5, [sp, #S_PC] @ update PC copy in regs
@@ -115,7 +115,7 @@ next:
@ plain LDR instruction. Weird, but it seems harmless.
.pushsection .fixup,"ax"
.align 2
-.Lfix: mov pc, r9 @ let the user eat segfaults
+.Lfix: ret r9 @ let the user eat segfaults
.popsection
.pushsection __ex_table,"a"