LXR linux/arch/powerpc/include/asm/sections.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_SECTIONS_H
   3#define _ASM_POWERPC_SECTIONS_H
   4#ifdef __KERNEL__
   5
   6#include <linux/elf.h>
   7#include <linux/uaccess.h>
   8#include <asm-generic/sections.h>
   9
  10extern char __head_end[];
  11
  12#ifdef __powerpc64__
  13
  14extern char __start_interrupts[];
  15extern char __end_interrupts[];
  16
  17extern char __prom_init_toc_start[];
  18extern char __prom_init_toc_end[];
  19
  20static inline int in_kernel_text(unsigned long addr)
  21{
  22        if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
  23                return 1;
  24
  25        return 0;
  26}
  27
  28static inline unsigned long kernel_toc_addr(void)
  29{
  30        /* Defined by the linker, see vmlinux.lds.S */
  31        extern unsigned long __toc_start;
  32
  33        /*
  34         * The TOC register (r2) points 32kB into the TOC, so that 64kB of
  35         * the TOC can be addressed using a single machine instruction.
  36         */
  37        return (unsigned long)(&__toc_start) + 0x8000UL;
  38}
  39
  40static inline int overlaps_interrupt_vector_text(unsigned long start,
  41                                                        unsigned long end)
  42{
  43        unsigned long real_start, real_end;
  44        real_start = __start_interrupts - _stext;
  45        real_end = __end_interrupts - _stext;
  46
  47        return start < (unsigned long)__va(real_end) &&
  48                (unsigned long)__va(real_start) < end;
  49}
  50
  51static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
  52{
  53        return start < (unsigned long)__init_end &&
  54                (unsigned long)_stext < end;
  55}
  56
  57static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
  58{
  59#ifdef CONFIG_KVM_GUEST
  60        extern char kvm_tmp[];
  61        return start < (unsigned long)kvm_tmp &&
  62                (unsigned long)&kvm_tmp[1024 * 1024] < end;
  63#else
  64        return 0;
  65#endif
  66}
  67
  68#ifdef PPC64_ELF_ABI_v1
  69#undef dereference_function_descriptor
  70static inline void *dereference_function_descriptor(void *ptr)
  71{
  72        struct ppc64_opd_entry *desc = ptr;
  73        void *p;
  74
  75        if (!probe_kernel_address(&desc->funcaddr, p))
  76                ptr = p;
  77        return ptr;
  78}
  79#endif /* PPC64_ELF_ABI_v1 */
  80
  81#endif
  82
  83#endif /* __KERNEL__ */
  84#endif  /* _ASM_POWERPC_SECTIONS_H */
  85