kernel/linux.git/arch/xtensa/lib, branch v6.1.168

xtensa: umulsidi3: fix conditional expression

2023-10-06T12:56:48+00:00

[ Upstream commit 9aecda97ec3deecbfa7670877c8ddfd3d0fc87c4 ] Even when a variant has one or more of these defines set to 1, the multiplier code paths are not used. Change the expression so that the correct code paths are used. arch/xtensa/lib/umulsidi3.S:44:38: warning: "XCHAL_NO_MUL" is not defined, evaluates to 0 [-Wundef] 44 | #if defined(__XTENSA_CALL0_ABI__) && XCHAL_NO_MUL arch/xtensa/lib/umulsidi3.S:145:38: warning: "XCHAL_NO_MUL" is not defined, evaluates to 0 [-Wundef] 145 | #if defined(__XTENSA_CALL0_ABI__) && XCHAL_NO_MUL arch/xtensa/lib/umulsidi3.S:159:5: warning: "XCHAL_NO_MUL" is not defined, evaluates to 0 [-Wundef] 159 | #if XCHAL_NO_MUL Fixes: 8939c58d68f9 ("xtensa: add __umulsidi3 helper") Signed-off-by: Randy Dunlap Cc: Chris Zankel Cc: Max Filippov Message-Id: <20230920052139.10570-16-rdunlap@infradead.org> Signed-off-by: Max Filippov Signed-off-by: Sasha Levin

xtensa: add __bswap{si,di}2 helpers

2023-05-30T13:03:18+00:00

commit 034f4a7877c32a8efd6beee4d71ed14e424499a9 upstream. gcc-13 may generate calls for __bswap{si,di}2. This breaks the kernel build when optimization for size is selected. Add __bswap{si,di}2 helpers to fix that. Cc: stable@vger.kernel.org Fixes: 19c5699f9aff ("xtensa: don't link with libgcc") Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman

xtensa: add __umulsidi3 helper

2023-01-07T10:11:46+00:00

commit 8939c58d68f97ce530f02d46c9f2b56c3ec88399 upstream. xtensa gcc-13 has changed multiplication handling and may now use __umulsidi3 helper where it used to use __muldi3. As a result building the kernel with the new gcc may fail with the following error: linux/init/main.c:1287: undefined reference to `__umulsidi3' Fix the build by providing __umulsidi3 implementation for xtensa. Cc: stable@vger.kernel.org # 5.18+ Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman

xtensa: enable KCSAN

2022-05-02T02:51:22+00:00

Prefix arch-specific barrier macros with '__' to make use of instrumented generic macros. Prefix arch-specific bitops with 'arch_' to make use of instrumented generic functions. Provide stubs for 64-bit atomics when building with KCSAN. Disable KCSAN instrumentation in arch/xtensa/boot. Signed-off-by: Max Filippov Acked-by: Marco Elver

xtensa: localize labels used in memmove

2022-05-02T02:51:20+00:00

Internal labels in the memmove implementation don't need to be visible, localize them by prefixing their names with '.L'. Signed-off-by: Max Filippov

xtensa: add helpers for division, remainder and shifts

2022-03-09T22:02:40+00:00

Don't rely on libgcc presence, build own versions of the helpers with correct ABI. Signed-off-by: Max Filippov

xtensa: don't use a12 in __xtensa_copy_user in call0 ABI

2021-10-19T05:19:34+00:00

a12 is callee-saved register in xtensa call0 ABI, so a function must not change it. The main unaligned copy loop of __xtensa_copy_user uses all low-numbered registers, so a register must be spilled to avoid using a12 as a loop counter. Signed-off-by: Max Filippov

xtensa: don't use a12 in strncpy_user

2021-10-19T05:19:34+00:00

a12 is callee-saved register in xtensa call0 ABI, so a function must not change it. a10 is not used in this function at all, use it instead of a12 to avoid saving/restoring it. Signed-off-by: Max Filippov

xtensa: propagate the calling conventions change down into csum_partial_copy_generic()

2020-08-20T19:45:21+00:00

turn the exception handlers into returning 0. Signed-off-by: Al Viro

xtensa: abstract 'entry' and 'retw' in assembly code

2019-07-08T17:04:48+00:00

Provide abi_entry, abi_entry_default, abi_ret and abi_ret_default macros that allocate aligned stack frame in windowed and call0 ABIs. Provide XTENSA_SPILL_STACK_RESERVE macro that specifies required stack frame size when register spilling is involved. Replace all uses of 'entry' and 'retw' with the above macros. This makes most of the xtensa assembly code ready for XEA3 and call0 ABI. Signed-off-by: Max Filippov