1 #ifndef _ASM_POWERPC_SECTIONS_H 2 #define _ASM_POWERPC_SECTIONS_H 3 #ifdef __KERNEL__ 4 5 #include <linux/elf.h> 6 #include <linux/uaccess.h> 7 #include <asm-generic/sections.h> 8 9 #ifdef __powerpc64__ 10 11 extern char __start_interrupts[]; 12 extern char __end_interrupts[]; 13 14 extern char __prom_init_toc_start[]; 15 extern char __prom_init_toc_end[]; 16 17 static inline int in_kernel_text(unsigned long addr) 18 { 19 if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end) 20 return 1; 21 22 return 0; 23 } 24 25 static inline unsigned long kernel_toc_addr(void) 26 { 27 /* Defined by the linker, see vmlinux.lds.S */ 28 extern unsigned long __toc_start; 29 30 /* 31 * The TOC register (r2) points 32kB into the TOC, so that 64kB of 32 * the TOC can be addressed using a single machine instruction. 33 */ 34 return (unsigned long)(&__toc_start) + 0x8000UL; 35 } 36 37 static inline int overlaps_interrupt_vector_text(unsigned long start, 38 unsigned long end) 39 { 40 unsigned long real_start, real_end; 41 real_start = __start_interrupts - _stext; 42 real_end = __end_interrupts - _stext; 43 44 return start < (unsigned long)__va(real_end) && 45 (unsigned long)__va(real_start) < end; 46 } 47 48 static inline int overlaps_kernel_text(unsigned long start, unsigned long end) 49 { 50 return start < (unsigned long)__init_end && 51 (unsigned long)_stext < end; 52 } 53 54 static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end) 55 { 56 #ifdef CONFIG_KVM_GUEST 57 extern char kvm_tmp[]; 58 return start < (unsigned long)kvm_tmp && 59 (unsigned long)&kvm_tmp[1024 * 1024] < end; 60 #else 61 return 0; 62 #endif 63 } 64 65 #ifdef PPC64_ELF_ABI_v1 66 #undef dereference_function_descriptor 67 static inline void *dereference_function_descriptor(void *ptr) 68 { 69 struct ppc64_opd_entry *desc = ptr; 70 void *p; 71 72 if (!probe_kernel_address(&desc->funcaddr, p)) 73 ptr = p; 74 return ptr; 75 } 76 #endif /* PPC64_ELF_ABI_v1 */ 77 78 #endif 79 80 #endif /* __KERNEL__ */ 81 #endif /* _ASM_POWERPC_SECTIONS_H */ 82