Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 */