xtensa: add support for TLS
The Xtensa architecture provides a global register called THREADPTR
for the purpose of Thread Local Storage (TLS) support. This allows us
to use a fairly simple implementation, keeping the thread pointer in
the regset and simply saving and restoring it upon entering/exiting
the from user space.
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/include/asm/elf.h b/arch/xtensa/include/asm/elf.h
index 264d5fa..eacb25a 100644
--- a/arch/xtensa/include/asm/elf.h
+++ b/arch/xtensa/include/asm/elf.h
@@ -84,7 +84,8 @@
elf_greg_t sar;
elf_greg_t windowstart;
elf_greg_t windowbase;
- elf_greg_t reserved[8+48];
+ elf_greg_t threadptr;
+ elf_greg_t reserved[7+48];
elf_greg_t a[64];
} xtensa_gregset_t;