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#include <asm-generic/sections.h>
 9
10extern char __head_end[];
11
12#ifdef __powerpc64__
13
14extern char __start_interrupts[];
15extern char __end_interrupts[];
16
17extern char __prom_init_toc_start[];
18extern char __prom_init_toc_end[];
19
20static inline int in_kernel_text(unsigned long addr)
21{
22	if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
23		return 1;
24
25	return 0;
26}
27
28static 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
40static 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
51static 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
57static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
58{
59#ifdef CONFIG_KVM_GUEST
60	extern char kvm_tmp[];
61	return start < (unsigned long)kvm_tmp &&
62		(unsigned long)&kvm_tmp[1024 * 1024] < end;
63#else
64	return 0;
65#endif
66}
67
68#ifdef PPC64_ELF_ABI_v1
69
70#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
71
72#undef dereference_function_descriptor
73static inline void *dereference_function_descriptor(void *ptr)
74{
75	struct ppc64_opd_entry *desc = ptr;
76	void *p;
77
78	if (!probe_kernel_address(&desc->funcaddr, p))
79		ptr = p;
80	return ptr;
81}
82
83#undef dereference_kernel_function_descriptor
84static inline void *dereference_kernel_function_descriptor(void *ptr)
85{
86	if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
87		return ptr;
88
89	return dereference_function_descriptor(ptr);
90}
91#endif /* PPC64_ELF_ABI_v1 */
92
93#endif
94
95#endif /* __KERNEL__ */
96#endif	/* _ASM_POWERPC_SECTIONS_H */