1 files changed, 96 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
new file mode 100644
index 000000000..e335a8f84
--- /dev/null
+++ b/arch/powerpc/include/asm/sections.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_SECTIONS_H
+#define _ASM_POWERPC_SECTIONS_H
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <linux/uaccess.h>
+#include <asm-generic/sections.h>
+
+extern char __head_end[];
+
+#ifdef __powerpc64__
+
+extern char __start_interrupts[];
+extern char __end_interrupts[];
+
+extern char __prom_init_toc_start[];
+extern char __prom_init_toc_end[];
+
+static inline int in_kernel_text(unsigned long addr)
+{
+	if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
+		return 1;
+
+	return 0;
+}
+
+static inline unsigned long kernel_toc_addr(void)
+{
+	/* Defined by the linker, see vmlinux.lds.S */
+	extern unsigned long __toc_start;
+
+	/*
+	 * The TOC register (r2) points 32kB into the TOC, so that 64kB of
+	 * the TOC can be addressed using a single machine instruction.
+	 */
+	return (unsigned long)(&__toc_start) + 0x8000UL;
+}
+
+static inline int overlaps_interrupt_vector_text(unsigned long start,
+							unsigned long end)
+{
+	unsigned long real_start, real_end;
+	real_start = __start_interrupts - _stext;
+	real_end = __end_interrupts - _stext;
+
+	return start < (unsigned long)__va(real_end) &&
+		(unsigned long)__va(real_start) < end;
+}
+
+static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
+{
+	return start < (unsigned long)__init_end &&
+		(unsigned long)_stext < end;
+}
+
+static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
+{
+#ifdef CONFIG_KVM_GUEST
+	extern char kvm_tmp[];
+	return start < (unsigned long)kvm_tmp &&
+		(unsigned long)&kvm_tmp[1024 * 1024] < end;
+#else
+	return 0;
+#endif
+}
+
+#ifdef PPC64_ELF_ABI_v1
+
+#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
+
+#undef dereference_function_descriptor
+static inline void *dereference_function_descriptor(void *ptr)
+{
+	struct ppc64_opd_entry *desc = ptr;
+	void *p;
+
+	if (!probe_kernel_address(&desc->funcaddr, p))
+		ptr = p;
+	return ptr;
+}
+
+#undef dereference_kernel_function_descriptor
+static inline void *dereference_kernel_function_descriptor(void *ptr)
+{
+	if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
+		return ptr;
+
+	return dereference_function_descriptor(ptr);
+}
+#endif /* PPC64_ELF_ABI_v1 */
+
+#endif
+
+#endif /* __KERNEL__ */
+#endif	/* _ASM_POWERPC_SECTIONS_H */