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
9#include <asm-generic/sections.h>
10
11extern char __head_end[];
12
13#ifdef __powerpc64__
14
15extern char __start_interrupts[];
16extern char __end_interrupts[];
17
18extern char __prom_init_toc_start[];
19extern char __prom_init_toc_end[];
20
21#ifdef CONFIG_PPC_POWERNV
22extern char start_real_trampolines[];
23extern char end_real_trampolines[];
24extern char start_virt_trampolines[];
25extern char end_virt_trampolines[];
26#endif
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
57#ifdef PPC64_ELF_ABI_v1
58
59#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
60
61#undef dereference_function_descriptor
62static inline void *dereference_function_descriptor(void *ptr)
63{
64 struct ppc64_opd_entry *desc = ptr;
65 void *p;
66
67 if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
68 ptr = p;
69 return ptr;
70}
71
72#undef dereference_kernel_function_descriptor
73static inline void *dereference_kernel_function_descriptor(void *ptr)
74{
75 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
76 return ptr;
77
78 return dereference_function_descriptor(ptr);
79}
80#endif /* PPC64_ELF_ABI_v1 */
81
82#endif
83
84#endif /* __KERNEL__ */
85#endif /* _ASM_POWERPC_SECTIONS_H */