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Commit 07630a37 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
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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: default avatarMichael Ellerman <michael@ellerman.id.au>
Acked-by: default avatarKumar Gala <galak@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 053a858e

include/asm-powerpc/code-patching.h

+16 −0
Original line number Diff line number Diff line
@@ -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 */