1 // SPDX-License-Identifier: GPL-2.0-or-later
57 void __weak arch_handle_alternative(unsigned short feature, struct special_alt *alt)  in arch_handle_alternative()  argument
64 	*sec = reloc->sym->sec;  in reloc_to_sec_off()
65 	*off = reloc->sym->offset + reloc_addend(reloc);  in reloc_to_sec_off()
70 			 struct special_alt *alt)  in get_alt_entry()  argument
75 	offset = idx * entry->size;  in get_alt_entry()
77 	alt->group = entry->group;  in get_alt_entry()
78 	alt->jump_or_nop = entry->jump_or_nop;  in get_alt_entry()
80 	if (alt->group) {  in get_alt_entry()
81 		alt->orig_len = *(unsigned char *)(sec->data->d_buf + offset +  in get_alt_entry()
82 						   entry->orig_len);  in get_alt_entry()
83 		alt->new_len = *(unsigned char *)(sec->data->d_buf + offset +  in get_alt_entry()
84 						  entry->new_len);  in get_alt_entry()
87 	orig_reloc = find_reloc_by_dest(elf, sec, offset + entry->orig);  in get_alt_entry()
89 		WARN_FUNC("can't find orig reloc", sec, offset + entry->orig);  in get_alt_entry()
90 		return -1;  in get_alt_entry()
93 	reloc_to_sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off);  in get_alt_entry()
95 	if (entry->feature) {  in get_alt_entry()
99 					  *(unsigned short *)(sec->data->d_buf +  in get_alt_entry()
101 							      entry->feature));  in get_alt_entry()
102 		arch_handle_alternative(feature, alt);  in get_alt_entry()
105 	if (!entry->group || alt->new_len) {  in get_alt_entry()
106 		new_reloc = find_reloc_by_dest(elf, sec, offset + entry->new);  in get_alt_entry()
109 				  sec, offset + entry->new);  in get_alt_entry()
110 			return -1;  in get_alt_entry()
113 		reloc_to_sec_off(new_reloc, &alt->new_sec, &alt->new_off);  in get_alt_entry()
116 		if (alt->new_off >= 0x7ffffff0)  in get_alt_entry()
117 			alt->new_off -= 0x7ffffff0;  in get_alt_entry()
120 	if (entry->key) {  in get_alt_entry()
123 		key_reloc = find_reloc_by_dest(elf, sec, offset + entry->key);  in get_alt_entry()
126 				  sec, offset + entry->key);  in get_alt_entry()
127 			return -1;  in get_alt_entry()
129 		alt->key_addend = reloc_addend(key_reloc);  in get_alt_entry()
145 	struct special_alt *alt;  in special_get_alts()  local
150 	for (entry = entries; entry->sec; entry++) {  in special_get_alts()
151 		sec = find_section_by_name(elf, entry->sec);  in special_get_alts()
155 		if (sec->sh.sh_size % entry->size != 0) {  in special_get_alts()
157 			     sec->name, entry->size);  in special_get_alts()
158 			return -1;  in special_get_alts()
161 		nr_entries = sec->sh.sh_size / entry->size;  in special_get_alts()
164 			alt = malloc(sizeof(*alt));  in special_get_alts()
165 			if (!alt) {  in special_get_alts()
167 				return -1;  in special_get_alts()
169 			memset(alt, 0, sizeof(*alt));  in special_get_alts()
171 			ret = get_alt_entry(elf, entry, sec, idx, alt);  in special_get_alts()
177 			list_add_tail(&alt->list, alts);  in special_get_alts()