diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2008-06-24 11:32:28 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-07-01 11:28:20 +1000 |
| commit | 07630a37beefe8e4401c602f04e3e5bcbba50b31 (patch) | |
| tree | 7e7c7b76abe634eeebb1b161ebfbd18638af2149 | |
| parent | 053a858efa46c9ab86363b271374ec02ad2af753 (diff) | |
powerpc: Add ppc_function_entry() which gets the entry point for a function
Because function pointers point to different things on 32-bit vs 64-bit,
add a macro that deals with dereferencing the OPD on 64-bit. The soon to
be merged ftrace wants this, as well as other code I am working on.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| -rw-r--r-- | include/asm-powerpc/code-patching.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-powerpc/code-patching.h b/include/asm-powerpc/code-patching.h index fdb187cbc40..a45a7ff7872 100644 --- a/include/asm-powerpc/code-patching.h +++ b/include/asm-powerpc/code-patching.h @@ -10,6 +10,8 @@ * 2 of the License, or (at your option) any later version. */ +#include <asm/types.h> + /* Flags for create_branch: * "b" == create_branch(addr, target, 0); * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE); @@ -24,4 +26,18 @@ unsigned int create_branch(const unsigned int *addr, void patch_branch(unsigned int *addr, unsigned long target, int flags); void patch_instruction(unsigned int *addr, unsigned int instr); +static inline unsigned long ppc_function_entry(void *func) +{ +#ifdef CONFIG_PPC64 + /* + * On PPC64 the function pointer actually points to the function's + * descriptor. The first entry in the descriptor is the address + * of the function text. + */ + return ((func_descr_t *)func)->entry; +#else + return (unsigned long)func; +#endif +} + #endif /* _ASM_POWERPC_CODE_PATCHING_H */ |