projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 64236ac1 AJ |
1 | /* |
| 2 | * Port on Texas Instruments TMS320C6x architecture | |
| 3 | * | |
| 4 | * Copyright (C) 2005, 2009, 2010, 2011 Texas Instruments Incorporated | |
| 5 | * Author: Thomas Charleux ([email protected]) | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | * | |
| 11 | */ | |
| 12 | #include <linux/moduleloader.h> | |
| 13 | #include <linux/elf.h> | |
| 14 | #include <linux/vmalloc.h> | |
| 15 | #include <linux/kernel.h> | |
| 16 | ||
| 17 | static inline int fixup_pcr(u32 *ip, Elf32_Addr dest, u32 maskbits, int shift) | |
| 18 | { | |
| 19 | u32 opcode; | |
| 20 | long ep = (long)ip & ~31; | |
| 21 | long delta = ((long)dest - ep) >> 2; | |
| 22 | long mask = (1 << maskbits) - 1; | |
| 23 | ||
| 24 | if ((delta >> (maskbits - 1)) == 0 || | |
| 25 | (delta >> (maskbits - 1)) == -1) { | |
| 26 | opcode = *ip; | |
| 27 | opcode &= ~(mask << shift); | |
| 28 | opcode |= ((delta & mask) << shift); | |
| 29 | *ip = opcode; | |
| 30 | ||
| 31 | pr_debug("REL PCR_S%d[%p] dest[%p] opcode[%08x]\n", | |
| 32 | maskbits, ip, (void *)dest, opcode); | |
| 33 | ||
| 34 | return 0; | |
| 35 | } | |
| 36 | pr_err("PCR_S%d reloc %p -> %p out of range!\n", | |
| 37 | maskbits, ip, (void *)dest); | |
| 38 | ||
| 39 | return -1; | |
| 40 | } | |
| 41 | ||
| 42 | /* | |
| 43 | * apply a RELA relocation | |
| 44 | */ | |
| 45 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
| 46 | const char *strtab, | |
| 47 | unsigned int symindex, | |
| 48 | unsigned int relsec, | |
| 49 | struct module *me) | |
| 50 | { | |
| 51 | Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr; | |
| 52 | Elf_Sym *sym; | |
| 53 | u32 *location, opcode; | |
| 54 | unsigned int i; | |
| 55 | Elf32_Addr v; | |
| 56 | Elf_Addr offset = 0; | |
| 57 | ||
| 58 | pr_debug("Applying relocate section %u to %u with offset 0x%x\n", | |
| 59 | relsec, sechdrs[relsec].sh_info, offset); | |
| 60 | ||
| 61 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
| 62 | /* This is where to make the change */ | |
| 63 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
| 64 | + rel[i].r_offset - offset; | |
| 65 | ||
| 66 | /* This is the symbol it is referring to. Note that all | |
| 67 | undefined symbols have been resolved. */ | |
| 68 | sym = (Elf_Sym *)sechdrs[symindex].sh_addr | |
| 69 | + ELF32_R_SYM(rel[i].r_info); | |
| 70 | ||
| 71 | /* this is the adjustment to be made */ | |
| 72 | v = sym->st_value + rel[i].r_addend; | |
| 73 | ||
| 74 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
| 75 | case R_C6000_ABS32: | |
| 76 | pr_debug("RELA ABS32: [%p] = 0x%x\n", location, v); | |
| 77 | *location = v; | |
| 78 | break; | |
| 79 | case R_C6000_ABS16: | |
| 80 | pr_debug("RELA ABS16: [%p] = 0x%x\n", location, v); | |
| 81 | *(u16 *)location = v; | |
| 82 | break; | |
| 83 | case R_C6000_ABS8: | |
| 84 | pr_debug("RELA ABS8: [%p] = 0x%x\n", location, v); | |
| 85 | *(u8 *)location = v; | |
| 86 | break; | |
| 87 | case R_C6000_ABS_L16: | |
| 88 | opcode = *location; | |
| 89 | opcode &= ~0x7fff80; | |
| 90 | opcode |= ((v & 0xffff) << 7); | |
| 91 | pr_debug("RELA ABS_L16[%p] v[0x%x] opcode[0x%x]\n", | |
| 92 | location, v, opcode); | |
| 93 | *location = opcode; | |
| 94 | break; | |
| 95 | case R_C6000_ABS_H16: | |
| 96 | opcode = *location; | |
| 97 | opcode &= ~0x7fff80; | |
| 98 | opcode |= ((v >> 9) & 0x7fff80); | |
| 99 | pr_debug("RELA ABS_H16[%p] v[0x%x] opcode[0x%x]\n", | |
| 100 | location, v, opcode); | |
| 101 | *location = opcode; | |
| 102 | break; | |
| 103 | case R_C6000_PCR_S21: | |
| 104 | if (fixup_pcr(location, v, 21, 7)) | |
| 105 | return -ENOEXEC; | |
| 106 | break; | |
| 107 | case R_C6000_PCR_S12: | |
| 108 | if (fixup_pcr(location, v, 12, 16)) | |
| 109 | return -ENOEXEC; | |
| 110 | break; | |
| 111 | case R_C6000_PCR_S10: | |
| 112 | if (fixup_pcr(location, v, 10, 13)) | |
| 113 | return -ENOEXEC; | |
| 114 | break; | |
| 115 | default: | |
| 116 | pr_err("module %s: Unknown RELA relocation: %u\n", | |
| 117 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
| 118 | return -ENOEXEC; | |
| 119 | } | |
| 120 | } | |
| 121 | ||
| 122 | return 0; | |
| 123 | } |