1 // SPDX-License-Identifier: GPL-2.0-or-later
54 void __weak arch_handle_alternative(unsigned short feature, struct special_alt *alt)  in arch_handle_alternative()  argument
61 	*sec = reloc->sym->sec;  in reloc_to_sec_off()
62 	*off = reloc->sym->offset + reloc->addend;  in reloc_to_sec_off()
67 			 struct special_alt *alt)  in get_alt_entry()  argument
72 	offset = idx * entry->size;  in get_alt_entry()
74 	alt->group = entry->group;  in get_alt_entry()
75 	alt->jump_or_nop = entry->jump_or_nop;  in get_alt_entry()
77 	if (alt->group) {  in get_alt_entry()
78 		alt->orig_len = *(unsigned char *)(sec->data->d_buf + offset +  in get_alt_entry()
79 						   entry->orig_len);  in get_alt_entry()
80 		alt->new_len = *(unsigned char *)(sec->data->d_buf + offset +  in get_alt_entry()
81 						  entry->new_len);  in get_alt_entry()
84 	if (entry->feature) {  in get_alt_entry()
87 		feature = *(unsigned short *)(sec->data->d_buf + offset +  in get_alt_entry()
88 					      entry->feature);  in get_alt_entry()
89 		arch_handle_alternative(feature, alt);  in get_alt_entry()
92 	orig_reloc = find_reloc_by_dest(elf, sec, offset + entry->orig);  in get_alt_entry()
94 		WARN_FUNC("can't find orig reloc", sec, offset + entry->orig);  in get_alt_entry()
95 		return -1;  in get_alt_entry()
98 	reloc_to_sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off);  in get_alt_entry()
100 	if (!entry->group || alt->new_len) {  in get_alt_entry()
101 		new_reloc = find_reloc_by_dest(elf, sec, offset + entry->new);  in get_alt_entry()
104 				  sec, offset + entry->new);  in get_alt_entry()
105 			return -1;  in get_alt_entry()
108 		reloc_to_sec_off(new_reloc, &alt->new_sec, &alt->new_off);  in get_alt_entry()
111 		if (alt->new_off >= 0x7ffffff0)  in get_alt_entry()
112 			alt->new_off -= 0x7ffffff0;  in get_alt_entry()
128 	struct special_alt *alt;  in special_get_alts()  local
133 	for (entry = entries; entry->sec; entry++) {  in special_get_alts()
134 		sec = find_section_by_name(elf, entry->sec);  in special_get_alts()
138 		if (sec->len % entry->size != 0) {  in special_get_alts()
140 			     sec->name, entry->size);  in special_get_alts()
141 			return -1;  in special_get_alts()
144 		nr_entries = sec->len / entry->size;  in special_get_alts()
147 			alt = malloc(sizeof(*alt));  in special_get_alts()
148 			if (!alt) {  in special_get_alts()
150 				return -1;  in special_get_alts()
152 			memset(alt, 0, sizeof(*alt));  in special_get_alts()
154 			ret = get_alt_entry(elf, entry, sec, idx, alt);  in special_get_alts()
160 			list_add_tail(&alt->list, alts);  in special_get_alts()