f3993a0330
Commit 67361cf8071286 ("powerpc/ftrace: Handle large kernel configs")
added ftrace support for ppc64 kernel images with a text section larger
than 32MB. The approach itself isn't specific to ppc64, so extend the
same to also work on ppc32.
While at it, reduce the space reserved for the stub from 64 bytes to 32
bytes since the different stub variants are all less than 8
instructions.
To reduce use of #ifdef, a stub implementation is provided for
kernel_toc_address() and -SZ_2G is cast to 'long long' to prevent
errors on ppc32.
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/9fa3258cbb9105cf8a0a8135214d44ffbc75fe84.1687166935.git.naveen@kernel.org
83 lines
2.0 KiB
C
83 lines
2.0 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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#ifdef CONFIG_PPC_KERNEL_PCREL
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BUILD_BUG();
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return -1UL;
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#else
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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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#endif
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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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#else
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static inline unsigned long kernel_toc_addr(void) { BUILD_BUG(); return -1UL; }
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SECTIONS_H */
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