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| author | Max Filippov <jcmvbkbc@gmail.com> | 2022-04-13 20:41:12 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-01 19:51:21 -0700 |
| commit | 55427d5b0dff5754f3579dde93955aac483e8d6a (patch) | |
| tree | 6acc44817c296f6a1f1c25894fb843880d749705 | |
| parent | 961c5efbc493ef497fe68ec07a4ed081acba4c92 (diff) | |
| download | lwn-55427d5b0dff5754f3579dde93955aac483e8d6a.tar.gz lwn-55427d5b0dff5754f3579dde93955aac483e8d6a.zip | |
xtensa: enable context tracking
Put user exit context tracking call on the common kernel entry/exit path
(function calls are impossible at earlier kernel entry stages because
PS.EXCM is not cleared yet). Put user entry context tracking call on the
user exit path. Syscalls go through this common code too, so nothing
specific needs to be done for them.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| -rw-r--r-- | Documentation/features/time/context-tracking/arch-support.txt | 2 | ||||
| -rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 9 |
3 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/features/time/context-tracking/arch-support.txt b/Documentation/features/time/context-tracking/arch-support.txt index bb1c1801553e..72e7aadeda7e 100644 --- a/Documentation/features/time/context-tracking/arch-support.txt +++ b/Documentation/features/time/context-tracking/arch-support.txt @@ -27,5 +27,5 @@ | sparc: | ok | | um: | TODO | | x86: | ok | - | xtensa: | TODO | + | xtensa: | ok | ----------------------- diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index bca2763495a1..553144ae1d4d 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -31,6 +31,7 @@ config XTENSA select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK + select HAVE_CONTEXT_TRACKING select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_EXIT_THREAD diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index d09f2c38ba84..f2c789a5a92a 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -457,6 +457,12 @@ KABI_W or a3, a3, a2 abi_call trace_hardirqs_off 1: #endif +#ifdef CONFIG_CONTEXT_TRACKING + l32i abi_tmp0, a1, PT_PS + bbci.l abi_tmp0, PS_UM_BIT, 1f + abi_call context_tracking_user_exit +1: +#endif /* Go to second-level dispatcher. Set up parameters to pass to the * exception handler and call the exception handler. @@ -540,6 +546,9 @@ common_exception_return: j .Lrestore_state .Lexit_tif_loop_user: +#ifdef CONFIG_CONTEXT_TRACKING + abi_call context_tracking_user_enter +#endif #ifdef CONFIG_HAVE_HW_BREAKPOINT _bbci.l abi_saved0, TIF_DB_DISABLED, 1f abi_call restore_dbreak |