|author||Chris Metcalf <firstname.lastname@example.org>||2013-08-07 16:03:08 -0400|
|committer||Chris Metcalf <email@example.com>||2013-08-13 16:26:31 -0400|
tile: provide traceability for hypervisor calls
This change adds infrastructure (CONFIG_TILE_HVGLUE_TRACE) that provides C code wrappers for the calls the kernel makes to the Tilera hypervisor. This allows standard kernel infrastructure like FTRACE to be able to instrument hypervisor calls. To allow direct calls to the true API, we export their names with a leading underscore as well. This is important for the few contexts where we need to make hypervisor calls without touching the stack. As part of this change, we also switch from creating the symbols with linker magic to creating them with assembler magic. This lets us provide a symbol type and generally make them appear more as symbols and less as just random values in the Elf namespace. Signed-off-by: Chris Metcalf <firstname.lastname@example.org>
Diffstat (limited to 'arch/tile/Kconfig.debug')
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/tile/Kconfig.debug b/arch/tile/Kconfig.debug
index 9165ea979e85..b8d69f2757a1 100644
@@ -24,4 +24,12 @@ config DEBUG_EXTRA_FLAGS
size and build time noticeably. Such flags are often
helpful if the main use of debug info is line number info.
+ bool "Provide wrapper functions for hypervisor ABI calls"
+ default n
+ Provide wrapper functions for the hypervisor ABI calls
+ defined in arch/tile/kernel/hvglue.S. This allows tracing
+ mechanisms, etc., to have visibility into those calls.