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__sigtramp2.S revision 1.4 
      1 /*	$NetBSD: __sigtramp2.S,v 1.4 2021/11/23 18:45:53 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "SYS.h"
     33 #include "assym.h"
     34 
     35 /*
     36  * The ARM signal trampoline is invoked only to return from
     37  * the signal; the kernel calls the signal handler directly.
     38  *
     39  * On entry, the stack looks like:
     40  *
     41  *		ucontext structure
     42  *	sp->	siginfo structure
     43  * and r5 points to the ucontext
     44  */
     45 
     46 #define	CFI_OFFSET(r)			.cfi_offset r, r * 4
     47 
     48 	_TEXT_SECTION
     49 	.cfi_startproc
     50 	.cfi_signal_frame
     51 	.cfi_def_cfa _REG_SP, SIZEOF_SIGINFO + _UC_GREGS
     52 	CFI_OFFSET(_REG_R0)
     53 	CFI_OFFSET(_REG_R1)
     54 	CFI_OFFSET(_REG_R2)
     55 	CFI_OFFSET(_REG_R3)
     56 	CFI_OFFSET(_REG_R4)
     57 	CFI_OFFSET(_REG_R5)
     58 	CFI_OFFSET(_REG_R6)
     59 	CFI_OFFSET(_REG_R7)
     60 	CFI_OFFSET(_REG_R8)
     61 	CFI_OFFSET(_REG_R9)
     62 	CFI_OFFSET(_REG_R10)
     63 	CFI_OFFSET(_REG_R11)
     64 	CFI_OFFSET(_REG_R12)
     65 	CFI_OFFSET(_REG_R13)	/* a.k.a. _REG_SP */
     66 	CFI_OFFSET(_REG_R14)	/* a.k.a. _REG_LR */
     67 	.cfi_return_column _REG_R15
     68 	CFI_OFFSET(_REG_R15)	/* a.k.a. _REG_PC */
     69 
     70 /*
     71  * The unwind entry includes the one instruction prior to the trampoline
     72  * because the unwinder will look up (return PC - 1) while unwinding.
     73  * Normally this would be the jump / branch, but since there isn't one in
     74  * this case, we place an explicit nop there instead.
     75  */
     76 	nop
     77 
     78 ENTRY_NP(__sigtramp_siginfo_2)
     79 	mov r0, r5				/* set the arg         */
     80 	SYSTRAP(setcontext)			/* and call setcontext */
     81 
     82 	/* If that failed, exit with the error code. */
     83 	SYSTRAP(exit)
     84 	.cfi_endproc
     85 END(__sigtramp_siginfo_2)
     86