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