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 */ 84