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 kernel_toc_addr(void)28 static inline unsigned long kernel_toc_addr(void) 29 { 30 /* Defined by the linker, see vmlinux.lds.S */ 31 extern unsigned long __toc_start; 32 33 /* 34 * The TOC register (r2) points 32kB into the TOC, so that 64kB of 35 * the TOC can be addressed using a single machine instruction. 36 */ 37 return (unsigned long)(&__toc_start) + 0x8000UL; 38 } 39 overlaps_interrupt_vector_text(unsigned long start,unsigned long end)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 overlaps_kernel_text(unsigned long start,unsigned long end)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 #define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 60 61 #undef dereference_function_descriptor dereference_function_descriptor(void * ptr)62 static inline void *dereference_function_descriptor(void *ptr) 63 { 64 struct ppc64_opd_entry *desc = ptr; 65 void *p; 66 67 if (!get_kernel_nofault(p, (void *)&desc->funcaddr)) 68 ptr = p; 69 return ptr; 70 } 71 72 #undef dereference_kernel_function_descriptor dereference_kernel_function_descriptor(void * ptr)73 static inline void *dereference_kernel_function_descriptor(void *ptr) 74 { 75 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) 76 return ptr; 77 78 return dereference_function_descriptor(ptr); 79 } 80 #endif /* PPC64_ELF_ABI_v1 */ 81 82 #endif 83 84 #endif /* __KERNEL__ */ 85 #endif /* _ASM_POWERPC_SECTIONS_H */ 86