In August 2012, Matthew Gretton-Dann checked a change into binutils
labelled "Error on obsolete & warn on deprecated registers", apparently as
part of ARMv8 support. Apparently, this was supposed to emit the message
"Warning: This coprocessor register access is deprecated in ARMv8" when
using certain mcr/mrc instructions and building for ARMv8. Unfortunately,
the message that is actually emitted appears to be '(null)', which is
less helpful in comparison.
Even more unfortunately, this is biting us on every single kernel
build with a new gas, because arch/arm/boot/compressed/head.S and some
other files in that directory are built with -march=all since kernel
commit 80cec14a8 "[ARM] Add -march=all to assembly file build in
arch/arm/boot/compressed" back in v2.6.28.
This patch reverts Russell's nice solution and replaces it with a more
complex one that sprinkles .arch statements inside of the head.S file
in functions that are executed in different architecture levels, which
seems to solve the original problem just as well, and gets rid of the
new one, too.
Without this patch, building anything results in:
arch/arm/boot/compressed/head.S: Assembler messages:
arch/arm/boot/compressed/head.S:565: Warning: (null)
arch/arm/boot/compressed/head.S:676: Warning: (null)
arch/arm/boot/compressed/head.S:698: Warning: (null)
arch/arm/boot/compressed/head.S:722: Warning: (null)
arch/arm/boot/compressed/head.S:726: Warning: (null)
arch/arm/boot/compressed/head.S:957: Warning: (null)
arch/arm/boot/compressed/head.S:996: Warning: (null)
arch/arm/boot/compressed/head.S:997: Warning: (null)
arch/arm/boot/compressed/head.S:1027: Warning: (null)
arch/arm/boot/compressed/head.S:1035: Warning: (null)
arch/arm/boot/compressed/head.S:1046: Warning: (null)
arch/arm/boot/compressed/head.S:1060: Warning: (null)
arch/arm/boot/compressed/head.S:1092: Warning: (null)
arch/arm/boot/compressed/head.S:1094: Warning: (null)
arch/arm/boot/compressed/head.S:1095: Warning: (null)
arch/arm/boot/compressed/head.S:1102: Warning: (null)
arch/arm/boot/compressed/head.S:1134: Warning: (null)
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Cc: Matthew Gretton-Dann <matthew.gretton-d...@arm.com>
Cc: Russell King <rmk+ker...@arm.linux.org.uk>
---
arch/arm/boot/compressed/Makefile | 2 +-
arch/arm/boot/compressed/head.S | 12 ++++++++++++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/compressed/Makefile
b/arch/arm/boot/compressed/Makefile
index afed28e..27f3604 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -121,7 +121,7 @@ KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
endif
ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
-asflags-y := -Wa,-march=all -DZIMAGE
+asflags-y := -DZIMAGE
# Supply kernel BSS size to the decompressor via a linker symbol.
KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index fe4d9c3..3b0b21a 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -548,6 +548,7 @@ cache_on: mov r3, #8 @ cache_on
function
* to cover all 32bit address and cacheable and bufferable.
*/
__armv4_mpu_cache_on:
+ .arch armv4
mov r0, #0x3f @ 4G, the whole
mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
mcr p15, 0, r0, c6, c7, 1
@@ -655,6 +656,7 @@ ENDPROC(__setup_mmu)
@ Enable unaligned access on v6, to allow better code generation
@ for the decompressor C code:
__armv6_mmu_cache_on:
+ .arch armv6
mrc p15, 0, r0, c1, c0, 0 @ read SCTLR
bic r0, r0, #2 @ A (no unaligned access fault)
orr r0, r0, #1 << 22 @ U (v6 unaligned access model)
@@ -663,11 +665,13 @@ __armv6_mmu_cache_on:
__arm926ejs_mmu_cache_on:
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+ .arch armv5
mov r0, #4 @ put dcache in WT mode
mcr p15, 7, r0, c15, c0, 0
#endif
__armv4_mmu_cache_on:
+ .arch armv4
mov r12, lr
#ifdef CONFIG_MMU
mov r6, #CB_BITS | 0x12 @ U
@@ -688,6 +692,7 @@ __armv4_mmu_cache_on:
mov pc, r12
__armv7_mmu_cache_on:
+ .arch armv7-a
mov r12, lr
#ifdef CONFIG_MMU
mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
@@ -1031,6 +1036,7 @@ cache_clean_flush:
mov r3, #16
b call_cache_fn
+ .arch armv4
__armv4_mpu_cache_flush:
mov r2, #1
mov r3, #0
@@ -1056,6 +1062,7 @@ __fa526_cache_flush:
mov pc, lr
__armv6_mmu_cache_flush:
+ .arch armv6
mov r1, #0
mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
@@ -1063,6 +1070,7 @@ __armv6_mmu_cache_flush:
mcr p15, 0, r1, c7, c10, 4 @ drain WB
mov pc, lr
+ .arch armv7-a
__armv7_mmu_cache_flush:
mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
@@ -1123,6 +1131,7 @@ iflush:
mcr p15, 0, r10, c7, c5, 4 @ ISB
mov pc, lr
+ .arch armv5
__armv5tej_mmu_cache_flush:
1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
bne 1b
@@ -1130,6 +1139,7 @@ __armv5tej_mmu_cache_flush:
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
+ .arch armv4
__armv4_mmu_cache_flush:
mov r2, #64*1024 @ default: 32K dcache size (*2)
mov r11, #32 @ default: 32 byte line size
@@ -1168,6 +1178,8 @@ __armv3_mpu_cache_flush:
mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3
mov pc, lr
+ .arch armv4
+
/*
* Various debugging routines for printing hex characters and
* memory, which again must be relocatable.
--
1.8.1.2
--
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