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
20#ifdef CONFIG_PPC_POWERNV
21extern char start_real_trampolines[];
22extern char end_real_trampolines[];
23extern char start_virt_trampolines[];
24extern char end_virt_trampolines[];
25#endif
26
27static inline int in_kernel_text(unsigned long addr)
28{
29	if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
30		return 1;
31
32	return 0;
33}
34
35static inline unsigned long kernel_toc_addr(void)
36{
37	/* Defined by the linker, see vmlinux.lds.S */
38	extern unsigned long __toc_start;
39
40	/*
41	 * The TOC register (r2) points 32kB into the TOC, so that 64kB of
42	 * the TOC can be addressed using a single machine instruction.
43	 */
44	return (unsigned long)(&__toc_start) + 0x8000UL;
45}
46
47static inline int overlaps_interrupt_vector_text(unsigned long start,
48							unsigned long end)
49{
50	unsigned long real_start, real_end;
51	real_start = __start_interrupts - _stext;
52	real_end = __end_interrupts - _stext;
53
54	return start < (unsigned long)__va(real_end) &&
55		(unsigned long)__va(real_start) < end;
56}
57
58static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
59{
60	return start < (unsigned long)__init_end &&
61		(unsigned long)_stext < end;
62}
63
64#ifdef PPC64_ELF_ABI_v1
65
66#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
 
 
 
 
 
 
 
67
 
68#undef dereference_function_descriptor
69static inline void *dereference_function_descriptor(void *ptr)
70{
71	struct ppc64_opd_entry *desc = ptr;
72	void *p;
73
74	if (!probe_kernel_address(&desc->funcaddr, p))
75		ptr = p;
76	return ptr;
77}
78
79#undef dereference_kernel_function_descriptor
80static inline void *dereference_kernel_function_descriptor(void *ptr)
81{
82	if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
83		return ptr;
84
85	return dereference_function_descriptor(ptr);
86}
87#endif /* PPC64_ELF_ABI_v1 */
88
89#endif
90
91#endif /* __KERNEL__ */
92#endif	/* _ASM_POWERPC_SECTIONS_H */