a2faac3986
Similar to commita6c30873ee("ARM: 8989/1: use .fpu assembler directives instead of assembler arguments"). GCC and GNU binutils support setting the "sub arch" via -march=, -Wa,-march, target function attribute, and .arch assembler directive. Clang was missing support for -Wa,-march=, but this was implemented in clang-13. The behavior of both GCC and Clang is to prefer -Wa,-march= over -march= for assembler and assembler-with-cpp sources, but Clang will warn about the -march= being unused. clang: warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] Since most assembler is non-conditionally assembled with one sub arch (modulo arch/arm/delay-loop.S which conditionally is assembled as armv4 based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the .arch assembler directive. Add a few more instances found in compile testing as found by Arnd and Nathan. Link:1d51c699b9Link: https://bugs.llvm.org/show_bug.cgi?id=48894 Link: https://github.com/ClangBuiltLinux/linux/issues/1195 Link: https://github.com/ClangBuiltLinux/linux/issues/1315 Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
38 lines
746 B
ArmAsm
38 lines
746 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright 2011 Freescale Semiconductor, Inc.
|
|
* Copyright 2011 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/assembler.h>
|
|
|
|
.arch armv7-a
|
|
|
|
diag_reg_offset:
|
|
.word g_diag_reg - .
|
|
|
|
.macro set_diag_reg
|
|
adr r0, diag_reg_offset
|
|
ldr r1, [r0]
|
|
add r1, r1, r0 @ r1 = physical &g_diag_reg
|
|
ldr r0, [r1]
|
|
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
|
|
.endm
|
|
|
|
ENTRY(v7_secondary_startup)
|
|
ARM_BE8(setend be) @ go BE8 if entered LE
|
|
mrc p15, 0, r0, c0, c0, 0
|
|
lsl r0, r0, #16
|
|
lsr r0, r0, #20
|
|
/* 0xc07 is cortex A7's ID */
|
|
mov r1, #0xc00
|
|
orr r1, #0x7
|
|
cmp r0, r1
|
|
beq secondary_startup
|
|
|
|
set_diag_reg
|
|
b secondary_startup
|
|
ENDPROC(v7_secondary_startup)
|