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
   9 #ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
  10 typedef struct func_desc func_desc_t;
  11 #endif
  12
  13 #include <asm-generic/sections.h>
  14
  15 extern char __head_end[];
  16 extern char __srwx_boundary[];
  17
  18 /* Patch sites */
  19 extern s32 patch__call_flush_branch_caches1;
  20 extern s32 patch__call_flush_branch_caches2;
  21 extern s32 patch__call_flush_branch_caches3;
  22 extern s32 patch__flush_count_cache_return;
  23 extern s32 patch__flush_link_stack_return;
  24 extern s32 patch__call_kvm_flush_link_stack;
  25 extern s32 patch__call_kvm_flush_link_stack_p9;
  26 extern s32 patch__memset_nocache, patch__memcpy_nocache;
  27
  28 extern long flush_branch_caches;
  29 extern long kvm_flush_link_stack;
  30
  31 #ifdef __powerpc64__
  32
  33 extern char __start_interrupts[];
  34 extern char __end_interrupts[];
  35
  36 #ifdef CONFIG_PPC_POWERNV
  37 extern char start_real_trampolines[];
  38 extern char end_real_trampolines[];
  39 extern char start_virt_trampolines[];
  40 extern char end_virt_trampolines[];
  41 #endif
  42
  43 /*
  44  * This assumes the kernel is never compiled -mcmodel=small or
  45  * the total .toc is always less than 64k.
  46  */
  47 static inline unsigned long kernel_toc_addr(void)
  48 {
  49 #ifdef CONFIG_PPC_KERNEL_PCREL
  50         BUILD_BUG();
  51         return -1UL;
  52 #else
  53         unsigned long toc_ptr;
  54
  55         asm volatile("mr %0, 2" : "=r" (toc_ptr));
  56         return toc_ptr;
  57 #endif
  58 }
  59
  60 static inline int overlaps_interrupt_vector_text(unsigned long start,
  61                                                         unsigned long end)
  62 {
  63         unsigned long real_start, real_end;
  64         real_start = __start_interrupts - _stext;
  65         real_end = __end_interrupts - _stext;
  66
  67         return start < (unsigned long)__va(real_end) &&
  68                 (unsigned long)__va(real_start) < end;
  69 }
  70
  71 static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
  72 {
  73         return start < (unsigned long)__init_end &&
  74                 (unsigned long)_stext < end;
  75 }
  76
  77 #else
  78 static inline unsigned long kernel_toc_addr(void) { BUILD_BUG(); return -1UL; }
  79 #endif
  80
  81 #endif /* __KERNEL__ */
  82 #endif  /* _ASM_POWERPC_SECTIONS_H */