1 // SPDX-License-Identifier: GPL-2.0-only
13 #define MAX_PATCH_SIZE (((u8)(-1)) / LOONGARCH_INSN_SIZE)
22 __setup("debug-alternative", debug_alt);
40 		for (_j = 0; _j < count - 1; _j++)			\
49 	while (count--) {  in add_nops()
50 		insn->word = INSN_NOP;  in add_nops()
67 	long offset;  in recompute_jump()  local
72 	si_l = src->reg0i26_format.immediate_l;  in recompute_jump()
73 	si_h = src->reg0i26_format.immediate_h;  in recompute_jump()
74 	switch (src->reg0i26_format.opcode) {  in recompute_jump()
80 		offset = jump_addr - pc;  in recompute_jump()
81 		BUG_ON(offset < -SZ_128M || offset >= SZ_128M);  in recompute_jump()
82 		offset >>= 2;  in recompute_jump()
83 		buf->reg0i26_format.immediate_h = offset >> 16;  in recompute_jump()
84 		buf->reg0i26_format.immediate_l = offset;  in recompute_jump()
88 	si_l = src->reg1i21_format.immediate_l;  in recompute_jump()
89 	si_h = src->reg1i21_format.immediate_h;  in recompute_jump()
90 	switch (src->reg1i21_format.opcode) {  in recompute_jump()
92 		BUG_ON(buf->reg1i21_format.rj & BIT(4));  in recompute_jump()
99 		offset = jump_addr - pc;  in recompute_jump()
100 		BUG_ON(offset < -SZ_4M || offset >= SZ_4M);  in recompute_jump()
101 		offset >>= 2;  in recompute_jump()
102 		buf->reg1i21_format.immediate_h = offset >> 16;  in recompute_jump()
103 		buf->reg1i21_format.immediate_l = offset;  in recompute_jump()
107 	si = src->reg2i16_format.immediate;  in recompute_jump()
108 	switch (src->reg2i16_format.opcode) {  in recompute_jump()
118 		offset = jump_addr - pc;  in recompute_jump()
119 		BUG_ON(offset < -SZ_128K || offset >= SZ_128K);  in recompute_jump()
120 		offset >>= 2;  in recompute_jump()
121 		buf->reg2i16_format.immediate = offset;  in recompute_jump()
136 			return -EINVAL;  in copy_alt_insns()
149  * text_poke_early - Update instructions on a live kernel at boot time
178  * before SMP is initialized to avoid SMP problems with self modifying code.
190 	DPRINTK("alt table %px, -> %px", start, end);  in apply_alternatives()
203 		instr = (void *)&a->instr_offset + a->instr_offset;  in apply_alternatives()
204 		replacement = (void *)&a->replace_offset + a->replace_offset;  in apply_alternatives()
206 		BUG_ON(a->instrlen > sizeof(insnbuf));  in apply_alternatives()
207 		BUG_ON(a->instrlen & 0x3);  in apply_alternatives()
208 		BUG_ON(a->replacementlen & 0x3);  in apply_alternatives()
210 		nr_instr = a->instrlen / LOONGARCH_INSN_SIZE;  in apply_alternatives()
211 		nr_repl = a->replacementlen / LOONGARCH_INSN_SIZE;  in apply_alternatives()
213 		if (!cpu_has(a->feature)) {  in apply_alternatives()
215 				a->feature, instr, a->instrlen,  in apply_alternatives()
216 				replacement, a->replacementlen);  in apply_alternatives()
222 			a->feature, instr, a->instrlen,  in apply_alternatives()
223 			replacement, a->replacementlen);  in apply_alternatives()
232 			add_nops(insnbuf + nr_repl, nr_instr - nr_repl);  in apply_alternatives()
233 			nr_insnbuf += nr_instr - nr_repl;  in apply_alternatives()