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LoongArch: Add unaligned access support

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Loongson-2 series (Loongson-2K500, Loongson-2K1000) don't support
unaligned access in hardware, while Loongson-3 series (Loongson-3A5000,
Loongson-3C5000) are configurable whether support unaligned access in
hardware. This patch add unaligned access emulation for those LoongArch
processors without hardware support.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen
2022-12-10 22:39:59 +08:00
parent dbcd7f5faf
commit 61a6fccc0b
9 changed files with 634 additions and 7 deletions
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Documentation/admin-guide/sysctl/kernel.rst
+4 -4
View File
@@ -433,8 +433,8 @@ ignore-unaligned-usertrap
On architectures where unaligned accesses cause traps, and where this
feature is supported (``CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN``;
currently, ``arc`` and ``ia64``), controls whether all unaligned traps
are logged.
currently, ``arc``, ``ia64`` and ``loongarch``), controls whether all
unaligned traps are logged.
= =============================================================
0 Log all unaligned accesses.
@@ -1457,8 +1457,8 @@ unaligned-trap
On architectures where unaligned accesses cause traps, and where this
feature is supported (``CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW``; currently,
``arc`` and ``parisc``), controls whether unaligned traps are caught
and emulated (instead of failing).
``arc``, ``parisc`` and ``loongarch``), controls whether unaligned traps
are caught and emulated (instead of failing).
= ========================================================
0 Do not emulate unaligned accesses.