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| author | Chris Zankel <chris@zankel.net> | 2013-02-24 04:35:57 +0100 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-02-24 04:35:57 +0100 |
| commit | c50842df47970eab459f13490c152aac85fc02f2 (patch) | |
| tree | d2933b4d9641067002ba6d662b0abf6ee3011375 /arch/xtensa/include | |
| parent | xtensa: add missing include asm/uaccess.h to checksum.h (diff) | |
| download | linux-c50842df47970eab459f13490c152aac85fc02f2.tar.xz linux-c50842df47970eab459f13490c152aac85fc02f2.zip | |
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>
Diffstat (limited to 'arch/xtensa/include')
| -rw-r--r-- | arch/xtensa/include/asm/elf.h | 3 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/ptrace.h | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/xtensa/include/asm/elf.h b/arch/xtensa/include/asm/elf.h index 264d5fa450d8..eacb25a41718 100644 --- a/arch/xtensa/include/asm/elf.h +++ b/arch/xtensa/include/asm/elf.h @@ -84,7 +84,8 @@ typedef struct { 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; diff --git a/arch/xtensa/include/asm/ptrace.h b/arch/xtensa/include/asm/ptrace.h index 682b1deac1f2..81f31bc9dde0 100644 --- a/arch/xtensa/include/asm/ptrace.h +++ b/arch/xtensa/include/asm/ptrace.h @@ -38,6 +38,7 @@ struct pt_regs { unsigned long syscall; /* 56 */ unsigned long icountlevel; /* 60 */ unsigned long scompare1; /* 64 */ + unsigned long threadptr; /* 68 */ /* Additional configurable registers that are used by the compiler. */ xtregs_opt_t xtregs_opt; @@ -48,7 +49,7 @@ struct pt_regs { /* current register frame. * Note: The ESF for kernel exceptions ends after 16 registers! */ - unsigned long areg[16]; /* 128 (64) */ + unsigned long areg[16]; }; #include <variant/core.h> |