Linux kernel mirror (for testing)
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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
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
64static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
65{
66#ifdef CONFIG_KVM_GUEST
67 extern char kvm_tmp[];
68 return start < (unsigned long)kvm_tmp &&
69 (unsigned long)&kvm_tmp[1024 * 1024] < end;
70#else
71 return 0;
72#endif
73}
74
75#ifdef PPC64_ELF_ABI_v1
76
77#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
78
79#undef dereference_function_descriptor
80static inline void *dereference_function_descriptor(void *ptr)
81{
82 struct ppc64_opd_entry *desc = ptr;
83 void *p;
84
85 if (!probe_kernel_address(&desc->funcaddr, p))
86 ptr = p;
87 return ptr;
88}
89
90#undef dereference_kernel_function_descriptor
91static inline void *dereference_kernel_function_descriptor(void *ptr)
92{
93 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
94 return ptr;
95
96 return dereference_function_descriptor(ptr);
97}
98#endif /* PPC64_ELF_ABI_v1 */
99
100#endif
101
102#endif /* __KERNEL__ */
103#endif /* _ASM_POWERPC_SECTIONS_H */