1 // SPDX-License-Identifier: GPL-2.0-only
21  * to zero which determines a BE endianness that is the native
27  * endianness "flipped back" to the native endianness (BE).
67 	thread_endianness = MSR_LE & ucp->uc_mcontext.gp_regs[PT_MSR];  in trap_signal_handler()
70 	 * Little-Endian Machine  in trap_signal_handler()
94 			 * not in transacional mode). On te other hand, if after  in trap_signal_handler()
95 			 * the return from the signal handler the endianness in-  in trap_signal_handler()
98 			 * and (4) are executed (tbegin.; trap;) and we get sim-  in trap_signal_handler()
99 			 * ilaly on the trap signal handler, but now in TM mode.  in trap_signal_handler()
104 			 * Finally, getting a trap in TM mode or not is just  in trap_signal_handler()
109 			 * a trap caught in non-transactional mode is the very  in trap_signal_handler()
116 				ucp->uc_mcontext.gp_regs[PT_NIP] += 16;  in trap_signal_handler()
123 				ucp->uc_mcontext.gp_regs[PT_MSR] |= 1UL;  in trap_signal_handler()
124 				ucp->uc_mcontext.gp_regs[PT_NIP] += 4;  in trap_signal_handler()
130 	 * Big-Endian Machine  in trap_signal_handler()
139 			 * trap in TM mode.  in trap_signal_handler()
141 			ucp->uc_mcontext.gp_regs[PT_MSR] |= 1UL;  in trap_signal_handler()
147 			 * second trap event endianness will flip back "automat-  in trap_signal_handler()
155 			 * Once here it means that after returning from the sec-  in trap_signal_handler()
171 			ucp->uc_mcontext.gp_regs[PT_MSR] &= ~1UL;  in trap_signal_handler()
172 			ucp->uc_mcontext.gp_regs[PT_NIP] += 8;  in trap_signal_handler()
200 		 * [NA] means "Native Endianness", i.e. it tells how a  in ping()
201 		 * instruction is executed on machine's native endianness (in  in ping()
202 		 * other words, native endianness matches kernel endianness).  in ping()
204 		 * tells how a instruction is executed as a LE instruction; con-  in ping()
207 		 * that the native interpretation of a given instruction is not  in ping()
283 	 * Bind thread ping() and pong() both to CPU 0 so they ping-pong and  in tm_trap_test()
295 		le ? "Little-Endian" : "Big-Endian",  in tm_trap_test()