arm/kernel/swp_emulate.c

8  *  Implements emulation of the SWP/SWPB instructions using load-exclusive and
12  *  Syntax of SWP{B} instruction: SWP{B}<c> <Rt>, <Rt2>, [<Rn>]
33  * Error-checking SWP macros implemented using ldrex{b}/strex{b}
73  * the SWP and SWPB variants (bit set means SWPB).
85 	seq_printf(m, "Emulated SWP:\t\t%lu\n", swpcounter);  in proc_status_show()
87 	seq_printf(m, "Aborted SWP{B}:\t\t%lu\n", abtcounter);  in proc_status_show()
108 	pr_debug("SWP{B} emulation: access caused memory abort!\n");  in set_segfault()
123 		/* SWP to unaligned address not permitted */  in emulate_swpX()
124 		pr_debug("SWP instruction on unaligned pointer!\n");  in emulate_swpX()
176 		/* If unconditional encoding - not a SWP, undef */  in swp_handler()
183 		pr_debug("\"%s\" (%ld) uses deprecated SWP{B} instruction\n",  in swp_handler()
198 	/* Check access in reasonable access range for both SWP and SWPB */  in swp_handler()
200 		pr_debug("SWP{B} emulation: access to %p not allowed!\n",  in swp_handler()
211 		 * instruction following the SWP{B}.  in swp_handler()
227  * Only emulate SWP/SWPB executed in ARM state/User mode.
228  * The kernel must be SWP free and SWP{B} does not exist in Thumb/ThumbEE.
253 	pr_notice("Registering SWP/SWPB emulation handler\n");  in swp_emulation_init()