/* $NetBSD: __sigtramp3.S,v 1.3 2021/11/24 15:05:16 thorpej Exp $ */
/*
* Copyright (c) 2003 Matt Thomas <matt@3am-software.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "SYS.h"
#include "assym.h"
#ifdef SYSLIBC_SCCS
RCSID("$NetBSD: __sigtramp3.S,v 1.3 2021/11/24 15:05:16 thorpej Exp $")
#endif
/*
* Signal trampoline; registers when called:
* pc, psl - obvious
* sp, ap - points to a CALLG argument list
* fp - address of signal handler
*
* Stack is set up like so:
* ucontext structure
* siginfo structure
* vvvv CALLG argument list vvvv
* 12(ap) -- pointer to ucontext
* 8(ap) -- pointer to siginfo
* 4(ap) -- signal number
* sp -> 0(ap) -- argument count
* ^^^^ CALLG argument list ^^^^
*
* N.B. all of the DWARF register numbers match our _REG_* constants.
* Also notice that while the %ap is adjusted inside the trampoline,
* the %sp is not adjusted, and so the CFA base does not change.
*/
#define CFI_OFFSET(r) .cfi_offset r, r * 4
.text
#if 0
.cfi_startproc simple
.cfi_signal_frame
.cfi_def_cfa _REG_SP, 16 + SIZEOF_SIGINFO + UC_GREGS
CFI_OFFSET(_REG_R0)
CFI_OFFSET(_REG_R1)
CFI_OFFSET(_REG_R2)
CFI_OFFSET(_REG_R3)
CFI_OFFSET(_REG_R4)
CFI_OFFSET(_REG_R5)
CFI_OFFSET(_REG_R6)
CFI_OFFSET(_REG_R7)
CFI_OFFSET(_REG_R8)
CFI_OFFSET(_REG_R9)
CFI_OFFSET(_REG_R10)
CFI_OFFSET(_REG_R11)
CFI_OFFSET(_REG_AP)
CFI_OFFSET(_REG_FP)
CFI_OFFSET(_REG_SP)
CFI_OFFSET(_REG_PC)
CFI_OFFSET(_REG_PSL)
#endif
/*
* The unwind entry includes one instruction slot prior to the trampoline
* because the unwinder will look up to (return PC - 1) while unwinding.
* Normally this would be the jump / branch, but since there isn't one in
* this case, we place an explicit nop there instead.
*/
#if 0
nop
#endif
_ALIGN_TEXT
.globl _C_LABEL(__sigtramp_siginfo_3)
_C_LABEL(__sigtramp_siginfo_3):
nop; nop
callg (%ap),(%fp) # use global arg list
addl2 $8,%ap # arg is pointer to ucontext
SYSTRAP(setcontext) # exit from here
halt # illegal insn
#if 0
.cfi_endproc
#endif