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
11extern char __start_interrupts[];
12extern char __end_interrupts[];
13
14extern char __prom_init_toc_start[];
15extern char __prom_init_toc_end[];
16
 
 
 
 
 
 
 
17static 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
25static 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
37static 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
48static 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
54static 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#if !defined(_CALL_ELF) || _CALL_ELF != 2
66#undef dereference_function_descriptor
67static 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
 
 
 
 
 
 
 
 
 
77
78#endif
79
80#endif /* __KERNEL__ */
81#endif	/* _ASM_POWERPC_SECTIONS_H */

  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
 13extern bool init_mem_is_free;
 14
 15static 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
 24extern char __head_end[];
 25
 26#ifdef __powerpc64__
 27
 28extern char __start_interrupts[];
 29extern char __end_interrupts[];
 30
 31extern char __prom_init_toc_start[];
 32extern char __prom_init_toc_end[];
 33
 34#ifdef CONFIG_PPC_POWERNV
 35extern char start_real_trampolines[];
 36extern char end_real_trampolines[];
 37extern char start_virt_trampolines[];
 38extern char end_virt_trampolines[];
 39#endif
 40
 41static 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
 49static 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
 61static 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
 72static 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
 83static inline void *dereference_function_descriptor(void *ptr)
 84{
 85	struct ppc64_opd_entry *desc = ptr;
 86	void *p;
 87
 88	if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
 89		ptr = p;
 90	return ptr;
 91}
 92
 93#undef dereference_kernel_function_descriptor
 94static 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 */