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MIPS: syscall: Emit Loongson3 sync workarounds within asm

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Generate the sync instructions required to workaround Loongson3 LL/SC
errata within inline asm blocks, which feels a little safer than doing
it from C where strictly speaking the compiler would be well within its
rights to insert a memory access between the separate asm statements we
previously had, containing sync & ll instructions respectively.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Paul Burton 2019-10-01 21:53:39 +00:00
parent 3c1d3f0979
commit e84957e6ae
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GPG key ID: 3EA79FACB57500DD
1 changed files with 2 additions and 1 deletions
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3
arch/mips/kernel/syscall.c
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@ -37,6 +37,7 @@
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/shmparam.h>
#include <asm/sync.h>
#include <asm/sysmips.h>
#include <asm/switch_to.h>
@ -133,12 +134,12 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
[efault] "i" (-EFAULT)
: "memory");
} else if (cpu_has_llsc) {
loongson_llsc_mb();
__asm__ __volatile__ (
" .set push \n"
" .set "MIPS_ISA_ARCH_LEVEL" \n"
" li %[err], 0 \n"
"1: \n"
" " __SYNC(full, loongson3_war) " \n"
user_ll("%[old]", "(%[addr])")
" move %[tmp], %[new] \n"
"2: \n"