From: Michael Ellerman Date: Tue, 24 Jun 2008 01:32:28 +0000 (+1000) Subject: powerpc: Add ppc_function_entry() which gets the entry point for a function X-Git-Tag: upstream/snapshot3+hdmi~24341^2~97 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=07630a37beefe8e4401c602f04e3e5bcbba50b31;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Acked-by: Kumar Gala Signed-off-by: Paul Mackerras --- diff --git a/include/asm-powerpc/code-patching.h b/include/asm-powerpc/code-patching.h index fdb187c..a45a7ff 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 + /* 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 */