| | 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 | #include <asm-generic/sections.h> |
| | 10 | |
| | 11 | extern char __head_end[]; |
| | 12 | |
| | 13 | #ifdef __powerpc64__ |
| | 14 | |
| | 15 | extern char __start_interrupts[]; |
| | 16 | extern char __end_interrupts[]; |
| | 17 | |
| | 18 | extern char __prom_init_toc_start[]; |
| | 19 | extern char __prom_init_toc_end[]; |
| | 20 | |
| | 21 | #ifdef CONFIG_PPC_POWERNV |
| | 22 | extern char start_real_trampolines[]; |
| | 23 | extern char end_real_trampolines[]; |
| | 24 | extern char start_virt_trampolines[]; |
| | 25 | extern char end_virt_trampolines[]; |
| | 26 | #endif |
| | 27 | |
| | 28 | static inline unsigned long kernel_toc_addr(void) |
| | 29 | { |
| | 30 | /* Defined by the linker, see vmlinux.lds.S */ |
| | 31 | extern unsigned long __toc_start; |
| | 32 | |
| | 33 | /* |
| | 34 | * The TOC register (r2) points 32kB into the TOC, so that 64kB of |
| | 35 | * the TOC can be addressed using a single machine instruction. |
| | 36 | */ |
| | 37 | return (unsigned long)(&__toc_start) + 0x8000UL; |
| | 38 | } |
| | 39 | |
| | 40 | static inline int overlaps_interrupt_vector_text(unsigned long start, |
| | 41 | unsigned long end) |
| | 42 | { |
| | 43 | unsigned long real_start, real_end; |
| | 44 | real_start = __start_interrupts - _stext; |
| | 45 | real_end = __end_interrupts - _stext; |
| | 46 | |
| | 47 | return start < (unsigned long)__va(real_end) && |
| | 48 | (unsigned long)__va(real_start) < end; |
| | 49 | } |
| | 50 | |
| | 51 | static inline int overlaps_kernel_text(unsigned long start, unsigned long end) |
| | 52 | { |
| | 53 | return start < (unsigned long)__init_end && |
| | 54 | (unsigned long)_stext < end; |
| | 55 | } |
| | 56 | |
| | 57 | #ifdef PPC64_ELF_ABI_v1 |
| | 58 | |
| | 59 | #define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 |
| | 60 | |
| | 61 | #undef dereference_function_descriptor |
| | 62 | static inline void *dereference_function_descriptor(void *ptr) |
| | 63 | { |
| | 64 | struct ppc64_opd_entry *desc = ptr; |
| | 65 | void *p; |
| | 66 | |
| | 67 | if (!get_kernel_nofault(p, (void *)&desc->funcaddr)) |
| | 68 | ptr = p; |
| | 69 | return ptr; |
| | 70 | } |
| | 71 | |
| | 72 | #undef dereference_kernel_function_descriptor |
| | 73 | static inline void *dereference_kernel_function_descriptor(void *ptr) |
| | 74 | { |
| | 75 | if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) |
| | 76 | return ptr; |
| | 77 | |
| | 78 | return dereference_function_descriptor(ptr); |
| | 79 | } |
| | 80 | #endif /* PPC64_ELF_ABI_v1 */ |
| | 81 | |
| | 82 | #endif |
| | 83 | |
| | 84 | #endif /* __KERNEL__ */ |
| | 85 | #endif /* _ASM_POWERPC_SECTIONS_H */ |
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