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
 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 */