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 #include <asm-generic/sections.h> 10 11 extern char __head_end[]; 12 13 #ifdef __powerpc64__ 14 15 extern char __start_interrupts[]; 16 extern char __end_interrupts[]; 17 18 extern char __prom_init_toc_start[]; 19 extern char __prom_init_toc_end[]; 20 21 #ifdef CONFIG_PPC_POWERNV 22 extern char start_real_trampolines[]; 23 extern char end_real_trampolines[]; 24 extern char start_virt_trampolines[]; 25 extern char end_virt_trampolines[]; 26 #endif 27 28 /* 29 * This assumes the kernel is never compiled -mcmodel=small or 30 * the total .toc is always less than 64k. 31 */ 32 static inline unsigned long kernel_toc_addr(void) 33 { 34 unsigned long toc_ptr; 35 36 asm volatile("mr %0, 2" : "=r" (toc_ptr)); 37 return toc_ptr; 38 } 39 40 static 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 51 static 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 57 #ifdef PPC64_ELF_ABI_v1 58 59 #undef dereference_function_descriptor 60 static inline void *dereference_function_descriptor(void *ptr) 61 { 62 struct func_desc *desc = ptr; 63 void *p; 64 65 if (!get_kernel_nofault(p, (void *)&desc->addr)) 66 ptr = p; 67 return ptr; 68 } 69 70 #undef dereference_kernel_function_descriptor 71 static inline void *dereference_kernel_function_descriptor(void *ptr) 72 { 73 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) 74 return ptr; 75 76 return dereference_function_descriptor(ptr); 77 } 78 #endif /* PPC64_ELF_ABI_v1 */ 79 80 #endif 81 82 #endif /* __KERNEL__ */ 83 #endif /* _ASM_POWERPC_SECTIONS_H */ 84