Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * OpenRISC module.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Linux architectural port borrowing liberally from similar works of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * others.  All original copyrights apply as per the original source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * declaration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Modifications for the OpenRISC architecture:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/moduleloader.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) int apply_relocate_add(Elf32_Shdr *sechdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		       const char *strtab,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		       unsigned int symindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		       unsigned int relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		       struct module *me)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	Elf32_Sym *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	uint32_t *location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	uint32_t value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	pr_debug("Applying relocate section %u to %u\n", relsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		 sechdrs[relsec].sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		/* This is where to make the change */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			+ rel[i].r_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		/* This is the symbol it is referring to.  Note that all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		   undefined symbols have been resolved.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 			+ ELF32_R_SYM(rel[i].r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		value = sym->st_value + rel[i].r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		switch (ELF32_R_TYPE(rel[i].r_info)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		case R_OR32_32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			*location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		case R_OR32_CONST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 			*((uint16_t *)location + 1) = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		case R_OR32_CONSTH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 			*((uint16_t *)location + 1) = value >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		case R_OR32_JUMPTARG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 			value -= (uint32_t)location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			value >>= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			value &= 0x03ffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			value |= *location & 0xfc000000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 			*location = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 			pr_err("module %s: Unknown relocation: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 			       me->name, ELF32_R_TYPE(rel[i].r_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }