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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#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
10typedef struct func_desc func_desc_t;
11#endif
12
13#include <asm-generic/sections.h>
14
15extern char __head_end[];
16extern char __srwx_boundary[];
17extern char __exittext_begin[], __exittext_end[];
18
19/* Patch sites */
20extern s32 patch__call_flush_branch_caches1;
21extern s32 patch__call_flush_branch_caches2;
22extern s32 patch__call_flush_branch_caches3;
23extern s32 patch__flush_count_cache_return;
24extern s32 patch__flush_link_stack_return;
25extern s32 patch__call_kvm_flush_link_stack;
26extern s32 patch__call_kvm_flush_link_stack_p9;
27extern s32 patch__memset_nocache, patch__memcpy_nocache;
28
29extern long flush_branch_caches;
30extern long kvm_flush_link_stack;
31
32#ifdef __powerpc64__
33
34extern char __start_interrupts[];
35extern char __end_interrupts[];
36
37#ifdef CONFIG_PPC_POWERNV
38extern char start_real_trampolines[];
39extern char end_real_trampolines[];
40extern char start_virt_trampolines[];
41extern char end_virt_trampolines[];
42#endif
43
44/*
45 * This assumes the kernel is never compiled -mcmodel=small or
46 * the total .toc is always less than 64k.
47 */
48static inline unsigned long kernel_toc_addr(void)
49{
50#ifdef CONFIG_PPC_KERNEL_PCREL
51 BUILD_BUG();
52 return -1UL;
53#else
54 unsigned long toc_ptr;
55
56 asm volatile("mr %0, 2" : "=r" (toc_ptr));
57 return toc_ptr;
58#endif
59}
60
61static inline int overlaps_interrupt_vector_text(unsigned long start,
62 unsigned long end)
63{
64 unsigned long real_start, real_end;
65 real_start = __start_interrupts - _stext;
66 real_end = __end_interrupts - _stext;
67
68 return start < (unsigned long)__va(real_end) &&
69 (unsigned long)__va(real_start) < end;
70}
71
72static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
73{
74 return start < (unsigned long)__init_end &&
75 (unsigned long)_stext < end;
76}
77
78#else
79static inline unsigned long kernel_toc_addr(void) { BUILD_BUG(); return -1UL; }
80#endif
81
82#endif /* __KERNEL__ */
83#endif /* _ASM_POWERPC_SECTIONS_H */