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ARM: 8221/1: PJ4: allow building in Thumb-2 mode

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Two files that get included when building the multi_v7_defconfig target
fail to build when selecting THUMB2_KERNEL for this configuration.

In both cases, we can just build the file as ARM code, as none of its
symbols are exported to modules, so there are no interworking concerns.
In the iwmmxt.S case, add ENDPROC() declarations so the symbols are
annotated as functions, resulting in the linker to emit the appropriate
mode switches.

Acked-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ard Biesheuvel 2014-11-25 13:31:46 +01:00 committed by Russell King
parent f3a04202c5
commit 13d1b9575a
2 changed files with 14 additions and 0 deletions
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1
arch/arm/kernel/Makefile
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@ -85,6 +85,7 @@ obj-$(CONFIG_CPU_PJ4B) += pj4-cp0.o
obj-$(CONFIG_IWMMXT) += iwmmxt.o
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o
CFLAGS_pj4-cp0.o := -marm
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o

13
arch/arm/kernel/iwmmxt.S
View file

@ -58,6 +58,7 @@
#define MMX_SIZE (0x98)
.text
.arm
/*
* Lazy switching of Concan coprocessor context
@ -182,6 +183,8 @@ concan_load:
tmcr wCon, r2
ret lr
ENDPROC(iwmmxt_task_enable)
/*
* Back up Concan regs to save area and disable access to them
* (mainly for gdb or sleep mode usage)
@ -232,6 +235,8 @@ ENTRY(iwmmxt_task_disable)
1: msr cpsr_c, ip @ restore interrupt mode
ldmfd sp!, {r4, pc}
ENDPROC(iwmmxt_task_disable)
/*
* Copy Concan state to given memory address
*
@ -268,6 +273,8 @@ ENTRY(iwmmxt_task_copy)
msr cpsr_c, ip @ restore interrupt mode
ret r3
ENDPROC(iwmmxt_task_copy)
/*
* Restore Concan state from given memory address
*
@ -304,6 +311,8 @@ ENTRY(iwmmxt_task_restore)
msr cpsr_c, ip @ restore interrupt mode
ret r3
ENDPROC(iwmmxt_task_restore)
/*
* Concan handling on task switch
*
@ -335,6 +344,8 @@ ENTRY(iwmmxt_task_switch)
mrc p15, 0, r1, c2, c0, 0
sub pc, lr, r1, lsr #32 @ cpwait and return
ENDPROC(iwmmxt_task_switch)
/*
* Remove Concan ownership of given task
*
@ -353,6 +364,8 @@ ENTRY(iwmmxt_task_release)
msr cpsr_c, r2 @ restore interrupts
ret lr
ENDPROC(iwmmxt_task_release)
.data
concan_owner:
.word 0