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/* Copyright 2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __ELF_ABI_H
#define __ELF_ABI_H
#ifndef __ASSEMBLY__
#if defined (_CALL_ELF) && _CALL_ELF == 2
#define ELF_ABI_v2
#else
#define ELF_ABI_v1
#endif
/* From linux/arch/powerpc/include/asm/code-patching.h */
#define OP_RT_RA_MASK 0xffff0000UL
#define LIS_R2 0x3c020000UL
#define ADDIS_R2_R12 0x3c4c0000UL
#define ADDI_R2_R2 0x38420000UL
static inline uint64_t function_entry_address(void *func)
{
#ifdef ELF_ABI_v2
u32 *insn = func;
/*
* A PPC64 ABIv2 function may have a local and a global entry
* point. We use the local entry point for branch tables called
* from asm, only a single TOC is used, so identify and step over
* the global entry point sequence.
*
* The global entry point sequence is always of the form:
*
* addis r2,r12,XXXX
* addi r2,r2,XXXX
*
* A linker optimisation may convert the addis to lis:
*
* lis r2,XXXX
* addi r2,r2,XXXX
*/
if ((((*insn & OP_RT_RA_MASK) == ADDIS_R2_R12) ||
((*insn & OP_RT_RA_MASK) == LIS_R2)) &&
((*(insn+1) & OP_RT_RA_MASK) == ADDI_R2_R2))
return (uint64_t)(insn + 2);
else
return (uint64_t)func;
#else
return *(uint64_t *)func;
#endif
}
#endif /* __ASSEMBLY__ */
#endif /* __COMPILER_H */
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