linux/arch/arm/lib/bswapsdi2.S
Russell King 6ebbf2ce43 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>
2014-07-18 12:29:04 +01:00

38 lines
610 B
ArmAsm

#include <linux/linkage.h>
#include <asm/assembler.h>
#if __LINUX_ARM_ARCH__ >= 6
ENTRY(__bswapsi2)
rev r0, r0
bx lr
ENDPROC(__bswapsi2)
ENTRY(__bswapdi2)
rev r3, r0
rev r0, r1
mov r1, r3
bx lr
ENDPROC(__bswapdi2)
#else
ENTRY(__bswapsi2)
eor r3, r0, r0, ror #16
mov r3, r3, lsr #8
bic r3, r3, #0xff00
eor r0, r3, r0, ror #8
ret lr
ENDPROC(__bswapsi2)
ENTRY(__bswapdi2)
mov ip, r1
eor r3, ip, ip, ror #16
eor r1, r0, r0, ror #16
mov r1, r1, lsr #8
mov r3, r3, lsr #8
bic r3, r3, #0xff00
bic r1, r1, #0xff00
eor r1, r1, r0, ror #8
eor r0, r3, ip, ror #8
ret lr
ENDPROC(__bswapdi2)
#endif