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5633e85b2c
We are moving towards separate kernel and module function descriptor dereference callbacks. This patch enables it for powerpc64. For pointers that belong to the kernel - Added __start_opd and __end_opd pointers, to track the kernel .opd section address range; - Added dereference_kernel_function_descriptor(). Now we will dereference only function pointers that are within [__start_opd, __end_opd); For pointers that belong to a module - Added dereference_module_function_descriptor() to handle module function descriptor dereference. Now we will dereference only pointers that are within [module->opd.start, module->opd.end). Link: http://lkml.kernel.org/r/20171109234830.5067-4-sergey.senozhatsky@gmail.com To: Tony Luck <tony.luck@intel.com> To: Fenghua Yu <fenghua.yu@intel.com> To: Helge Deller <deller@gmx.de> To: Benjamin Herrenschmidt <benh@kernel.crashing.org> To: Paul Mackerras <paulus@samba.org> To: Michael Ellerman <mpe@ellerman.id.au> To: James Bottomley <jejb@parisc-linux.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jessica Yu <jeyu@kernel.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: linux-ia64@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Tested-by: Santosh Sivaraj <santosh@fossix.org> #powerpc Signed-off-by: Petr Mladek <pmladek@suse.com>
96 lines
2.2 KiB
C
96 lines
2.2 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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#include <asm-generic/sections.h>
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extern char __head_end[];
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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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extern char __prom_init_toc_start[];
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extern char __prom_init_toc_end[];
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static inline int in_kernel_text(unsigned long addr)
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{
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if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
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return 1;
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return 0;
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}
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static inline unsigned long kernel_toc_addr(void)
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{
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/* Defined by the linker, see vmlinux.lds.S */
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extern unsigned long __toc_start;
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/*
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* The TOC register (r2) points 32kB into the TOC, so that 64kB of
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* the TOC can be addressed using a single machine instruction.
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*/
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return (unsigned long)(&__toc_start) + 0x8000UL;
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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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static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
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{
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#ifdef CONFIG_KVM_GUEST
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extern char kvm_tmp[];
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return start < (unsigned long)kvm_tmp &&
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(unsigned long)&kvm_tmp[1024 * 1024] < end;
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#else
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return 0;
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#endif
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}
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#ifdef PPC64_ELF_ABI_v1
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#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
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#undef dereference_function_descriptor
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static inline void *dereference_function_descriptor(void *ptr)
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{
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struct ppc64_opd_entry *desc = ptr;
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void *p;
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if (!probe_kernel_address(&desc->funcaddr, p))
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ptr = p;
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return ptr;
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}
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#undef dereference_kernel_function_descriptor
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static inline void *dereference_kernel_function_descriptor(void *ptr)
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{
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if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
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return ptr;
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return dereference_function_descriptor(ptr);
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}
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#endif /* PPC64_ELF_ABI_v1 */
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SECTIONS_H */
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