projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| fbcd54b1 JL |
2 | #ifndef _ASM_POWERPC_SECTIONS_H |
| 3 | #define _ASM_POWERPC_SECTIONS_H | |
| 88ced031 | 4 | #ifdef __KERNEL__ |
| 1da177e4 | 5 | |
| 2d291e90 JB |
6 | #include <linux/elf.h> |
| 7 | #include <linux/uaccess.h> | |
| 1da177e4 LT |
8 | #include <asm-generic/sections.h> |
| 9 | ||
| 7aa5b018 NR |
10 | extern char __head_end[]; |
| 11 | ||
| fbcd54b1 | 12 | #ifdef __powerpc64__ |
| 1da177e4 | 13 | |
| 429d2e83 | 14 | extern char __start_interrupts[]; |
| d715e433 | 15 | extern char __end_interrupts[]; |
| 1da177e4 | 16 | |
| 5ac47f7a AB |
17 | extern char __prom_init_toc_start[]; |
| 18 | extern char __prom_init_toc_end[]; | |
| 19 | ||
| bd3524fe NP |
20 | #ifdef CONFIG_PPC_POWERNV |
| 21 | extern char start_real_trampolines[]; | |
| 22 | extern char end_real_trampolines[]; | |
| 23 | extern char start_virt_trampolines[]; | |
| 24 | extern char end_virt_trampolines[]; | |
| 25 | #endif | |
| 26 | ||
| 1da177e4 LT |
27 | static inline int in_kernel_text(unsigned long addr) |
| 28 | { | |
| 29 | if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end) | |
| 30 | return 1; | |
| 31 | ||
| 32 | return 0; | |
| 33 | } | |
| 34 | ||
| a5cab83c ME |
35 | static inline unsigned long kernel_toc_addr(void) |
| 36 | { | |
| 37 | /* Defined by the linker, see vmlinux.lds.S */ | |
| 38 | extern unsigned long __toc_start; | |
| 39 | ||
| 40 | /* | |
| 41 | * The TOC register (r2) points 32kB into the TOC, so that 64kB of | |
| 42 | * the TOC can be addressed using a single machine instruction. | |
| 43 | */ | |
| 44 | return (unsigned long)(&__toc_start) + 0x8000UL; | |
| 45 | } | |
| 46 | ||
| 429d2e83 MS |
47 | static inline int overlaps_interrupt_vector_text(unsigned long start, |
| 48 | unsigned long end) | |
| 49 | { | |
| 50 | unsigned long real_start, real_end; | |
| 51 | real_start = __start_interrupts - _stext; | |
| 52 | real_end = __end_interrupts - _stext; | |
| 53 | ||
| 54 | return start < (unsigned long)__va(real_end) && | |
| 55 | (unsigned long)__va(real_start) < end; | |
| 56 | } | |
| 57 | ||
| 549e8152 PM |
58 | static inline int overlaps_kernel_text(unsigned long start, unsigned long end) |
| 59 | { | |
| 60 | return start < (unsigned long)__init_end && | |
| 61 | (unsigned long)_stext < end; | |
| 62 | } | |
| 63 | ||
| f55d9665 | 64 | #ifdef PPC64_ELF_ABI_v1 |
| 5633e85b SS |
65 | |
| 66 | #define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 | |
| 67 | ||
| deac93df | 68 | #undef dereference_function_descriptor |
| 2d291e90 JB |
69 | static inline void *dereference_function_descriptor(void *ptr) |
| 70 | { | |
| 71 | struct ppc64_opd_entry *desc = ptr; | |
| 72 | void *p; | |
| 73 | ||
| 74 | if (!probe_kernel_address(&desc->funcaddr, p)) | |
| 75 | ptr = p; | |
| 76 | return ptr; | |
| 77 | } | |
| 5633e85b SS |
78 | |
| 79 | #undef dereference_kernel_function_descriptor | |
| 80 | static inline void *dereference_kernel_function_descriptor(void *ptr) | |
| 81 | { | |
| 82 | if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) | |
| 83 | return ptr; | |
| 84 | ||
| 85 | return dereference_function_descriptor(ptr); | |
| 86 | } | |
| f55d9665 | 87 | #endif /* PPC64_ELF_ABI_v1 */ |
| deac93df | 88 | |
| 1da177e4 | 89 | #endif |
| fbcd54b1 | 90 | |
| 88ced031 | 91 | #endif /* __KERNEL__ */ |
| fbcd54b1 | 92 | #endif /* _ASM_POWERPC_SECTIONS_H */ |