hexagon/kernel/vm_entry.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Event entry/exit for Hexagon
5  * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
8 #include <asm/asm-offsets.h>  /*  assembly-safer versions of C defines */
9 #include <asm/mem-layout.h>   /*  sigh, except for page_offset  */
14  * Entry into guest-mode Linux under Hexagon Virtual Machine.
15  * Stack pointer points to event record - build pt_regs on top of it,
25  * register, putting prior thread_info.regs pointer in a callee-save
31  * to -1 for all events.  It will be replaced with the system call
75    R2 = #-1; } \
105 	{	THREADINFO_REG = and(R0, # ## #-_THREAD_SIZE); \
112 	  R2 = #-1; } \
206 		R29 = add(R29, #-(_PT_REGS_SIZE)); \
207 		memd(R29 + #(_PT_R0100 + -_PT_REGS_SIZE)) = R1:0; \
229 		R29 = add(R29, #-(_PT_REGS_SIZE)); \
230 		memd(R29 + #(_PT_R0100 + -_PT_REGS_SIZE)) = R1:0; \
231 		memd(R29 + #(_PT_R0302 + -_PT_REGS_SIZE)) = R3:2; \
264 	 * Coming back from the C-world, our thread info pointer
278 	/*  "Nested control path" -- if the previous mode was kernel  */
292 	 * user mode