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 #define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed 10 11 #include <asm-generic/sections.h> 12 13 extern bool init_mem_is_free; 14 15 static inline int arch_is_kernel_initmem_freed(unsigned long addr) 16 { 17 if (!init_mem_is_free) 18 return 0; 19 20 return addr >= (unsigned long)__init_begin && 21 addr < (unsigned long)__init_end; 22 } 23 24 extern char __head_end[]; 25 26 #ifdef __powerpc64__ 27 28 extern char __start_interrupts[]; 29 extern char __end_interrupts[]; 30 31 extern char __prom_init_toc_start[]; 32 extern char __prom_init_toc_end[]; 33 34 #ifdef CONFIG_PPC_POWERNV 35 extern char start_real_trampolines[]; 36 extern char end_real_trampolines[]; 37 extern char start_virt_trampolines[]; 38 extern char end_virt_trampolines[]; 39 #endif 40 41 static inline int in_kernel_text(unsigned long addr) 42 { 43 if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end) 44 return 1; 45 46 return 0; 47 } 48 49 static inline unsigned long kernel_toc_addr(void) 50 { 51 /* Defined by the linker, see vmlinux.lds.S */ 52 extern unsigned long __toc_start; 53 54 /* 55 * The TOC register (r2) points 32kB into the TOC, so that 64kB of 56 * the TOC can be addressed using a single machine instruction. 57 */ 58 return (unsigned long)(&__toc_start) + 0x8000UL; 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 #ifdef PPC64_ELF_ABI_v1 79 80 #define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 81 82 #undef dereference_function_descriptor 83 static inline void *dereference_function_descriptor(void *ptr) 84 { 85 struct ppc64_opd_entry *desc = ptr; 86 void *p; 87 88 if (!probe_kernel_address(&desc->funcaddr, p)) 89 ptr = p; 90 return ptr; 91 } 92 93 #undef dereference_kernel_function_descriptor 94 static inline void *dereference_kernel_function_descriptor(void *ptr) 95 { 96 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) 97 return ptr; 98 99 return dereference_function_descriptor(ptr); 100 } 101 #endif /* PPC64_ELF_ABI_v1 */ 102 103 #endif 104 105 #endif /* __KERNEL__ */ 106 #endif /* _ASM_POWERPC_SECTIONS_H */ 107