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https://github.com/Fishwaldo/linux-bl808.git
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b150a4d12b
Currently __init_begin is used as the boundary for strict RWX between executable/read-only text and data, and non-executable (after boot) code and data. But that's a little subtle, so add an explicit symbol to document that the SRWX boundary lies there, and add a comment making it clear that __init_begin must also begin there. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220916131422.318752-2-mpe@ellerman.id.au
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_SECTIONS_H
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#define _ASM_POWERPC_SECTIONS_H
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#ifdef __KERNEL__
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#include <linux/elf.h>
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#include <linux/uaccess.h>
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#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
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typedef struct func_desc func_desc_t;
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#endif
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#include <asm-generic/sections.h>
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extern char __head_end[];
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extern char __srwx_boundary[];
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/* Patch sites */
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extern s32 patch__call_flush_branch_caches1;
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extern s32 patch__call_flush_branch_caches2;
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extern s32 patch__call_flush_branch_caches3;
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extern s32 patch__flush_count_cache_return;
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extern s32 patch__flush_link_stack_return;
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extern s32 patch__call_kvm_flush_link_stack;
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extern s32 patch__call_kvm_flush_link_stack_p9;
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extern s32 patch__memset_nocache, patch__memcpy_nocache;
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extern long flush_branch_caches;
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extern long kvm_flush_link_stack;
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#ifdef __powerpc64__
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extern char __start_interrupts[];
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extern char __end_interrupts[];
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#ifdef CONFIG_PPC_POWERNV
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extern char start_real_trampolines[];
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extern char end_real_trampolines[];
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extern char start_virt_trampolines[];
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extern char end_virt_trampolines[];
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#endif
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/*
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* This assumes the kernel is never compiled -mcmodel=small or
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* the total .toc is always less than 64k.
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*/
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static inline unsigned long kernel_toc_addr(void)
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{
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unsigned long toc_ptr;
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asm volatile("mr %0, 2" : "=r" (toc_ptr));
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return toc_ptr;
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}
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static inline int overlaps_interrupt_vector_text(unsigned long start,
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unsigned long end)
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{
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unsigned long real_start, real_end;
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real_start = __start_interrupts - _stext;
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real_end = __end_interrupts - _stext;
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return start < (unsigned long)__va(real_end) &&
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(unsigned long)__va(real_start) < end;
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}
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static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
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{
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return start < (unsigned long)__init_end &&
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(unsigned long)_stext < end;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SECTIONS_H */
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