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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>
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/mm/copypage-feroceon.S
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*
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* Copyright (C) 2008 Marvell Semiconductors
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*
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* This handles copy_user_highpage and clear_user_page on Feroceon
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* more optimally than the generic implementations.
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*/
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#include <linux/init.h>
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#include <linux/highmem.h>
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static void feroceon_copy_user_page(void *kto, const void *kfrom)
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{
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int tmp;
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asm volatile ("\
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.arch armv5te \n\
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1: ldmia %1!, {r2 - r7, ip, lr} \n\
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pld [%1, #0] \n\
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pld [%1, #32] \n\
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pld [%1, #64] \n\
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pld [%1, #96] \n\
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pld [%1, #128] \n\
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pld [%1, #160] \n\
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pld [%1, #192] \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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ldmia %1!, {r2 - r7, ip, lr} \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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stmia %0, {r2 - r7, ip, lr} \n\
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subs %2, %2, #(32 * 8) \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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bne 1b \n\
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mcr p15, 0, %2, c7, c10, 4 @ drain WB"
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: "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
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: "2" (PAGE_SIZE)
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: "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
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}
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void feroceon_copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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void *kto, *kfrom;
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kto = kmap_atomic(to);
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kfrom = kmap_atomic(from);
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flush_cache_page(vma, vaddr, page_to_pfn(from));
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feroceon_copy_user_page(kto, kfrom);
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kunmap_atomic(kfrom);
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kunmap_atomic(kto);
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}
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void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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void *ptr, *kaddr = kmap_atomic(page);
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asm volatile ("\
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mov r1, %2 \n\
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mov r2, #0 \n\
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mov r3, #0 \n\
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mov r4, #0 \n\
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mov r5, #0 \n\
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mov r6, #0 \n\
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mov r7, #0 \n\
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mov ip, #0 \n\
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mov lr, #0 \n\
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1: stmia %0, {r2-r7, ip, lr} \n\
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subs r1, r1, #1 \n\
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mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
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add %0, %0, #32 \n\
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bne 1b \n\
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mcr p15, 0, r1, c7, c10, 4 @ drain WB"
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: "=r" (ptr)
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: "0" (kaddr), "I" (PAGE_SIZE / 32)
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: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
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kunmap_atomic(kaddr);
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}
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struct cpu_user_fns feroceon_user_fns __initdata = {
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.cpu_clear_user_highpage = feroceon_clear_user_highpage,
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.cpu_copy_user_highpage = feroceon_copy_user_highpage,
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};
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