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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_SECTIONS_H
#define _ASM_POWERPC_SECTIONS_H
#ifdef __KERNEL__
#include <linux/elf.h>
#include <linux/uaccess.h>
#include <asm-generic/sections.h>
extern char __head_end[];
#ifdef __powerpc64__
extern char __start_interrupts[];
extern char __end_interrupts[];
extern char __prom_init_toc_start[];
extern char __prom_init_toc_end[];
static inline int in_kernel_text(unsigned long addr)
{
if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
return 1;
return 0;
}
static inline unsigned long kernel_toc_addr(void)
{
/* Defined by the linker, see vmlinux.lds.S */
extern unsigned long __toc_start;
/*
* The TOC register (r2) points 32kB into the TOC, so that 64kB of
* the TOC can be addressed using a single machine instruction.
*/
return (unsigned long)(&__toc_start) + 0x8000UL;
}
static inline int overlaps_interrupt_vector_text(unsigned long start,
unsigned long end)
{
unsigned long real_start, real_end;
real_start = __start_interrupts - _stext;
real_end = __end_interrupts - _stext;
return start < (unsigned long)__va(real_end) &&
(unsigned long)__va(real_start) < end;
}
static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
{
return start < (unsigned long)__init_end &&
(unsigned long)_stext < end;
}
static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
{
#ifdef CONFIG_KVM_GUEST
extern char kvm_tmp[];
return start < (unsigned long)kvm_tmp &&
(unsigned long)&kvm_tmp[1024 * 1024] < end;
#else
return 0;
#endif
}
#ifdef PPC64_ELF_ABI_v1
#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
#undef dereference_function_descriptor
static inline void *dereference_function_descriptor(void *ptr)
{
struct ppc64_opd_entry *desc = ptr;
void *p;
if (!probe_kernel_address(&desc->funcaddr, p))
ptr = p;
return ptr;
}
#undef dereference_kernel_function_descriptor
static inline void *dereference_kernel_function_descriptor(void *ptr)
{
if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
return ptr;
return dereference_function_descriptor(ptr);
}
#endif /* PPC64_ELF_ABI_v1 */
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_SECTIONS_H */
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