/* $NetBSD: __sigtramp2.S,v 1.8 2024/02/02 22:00:32 andvar Exp $ */ /* * Copyright (c) 1998-2001 Michael Shalayeff * 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. * * 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 OR HIS RELATIVES 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 MIND, 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. * * Portitions of this file are derived from other sources, see * the copyrights and acknowledgements below. */ /* * Copyright (c) 1990,1991,1992,1994 The University of Utah and * the Computer Systems Laboratory (CSL). All rights reserved. * * THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS" * CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES * WHATSOEVER RESULTING FROM ITS USE. * * CSL requests users of this software to return to csl-dist@cs.utah.edu any * improvements that they make and grant CSL redistribution rights. * * Utah $Hdr: locore.s 1.62 94/12/15$ */ /* * (c) Copyright 1988 HEWLETT-PACKARD COMPANY * * To anyone who acknowledges that this file is provided "AS IS" * without any express or implied warranty: * permission to use, copy, modify, and distribute this file * for any purpose is hereby granted without fee, provided that * the above copyright notice and this notice appears in all * copies, and that the name of Hewlett-Packard Company not be * used in advertising or publicity pertaining to distribution * of the software without specific, written prior permission. * Hewlett-Packard Company makes no representations about the * suitability of this software for any purpose. */ #include "SYS.h" #include "assym.h" /* * The hppa signal trampoline is required to call the handler * possibly via a PLABEL. * * On entry, stack looks like: * * sp-> [x] * r3,arg2-> ucontext structure * arg1-> siginfo structure [0] * * where * x = HPPA_FRAME_ROUND(sizeof(sigframe_siginfo)) * * and * struct sigframe_siginfo { * siginfo_t sf_si; * ucontext_t sf_uc; * }; * * The DWARF register numbers for the general purpose registers are the * same as the architected register numbers. For HPPA, there is a DWARF * pseudo-register for signal handler return addresses. */ #if defined(__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__) #define DWARF_SIGRETURN_REG __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__ #else #define DWARF_SIGRETURN_REG 89 /* 61 on hppa64 */ #endif #define CFI_OFFSET_DWARF_REG(d, r) .cfi_offset d, r * 4 #define CFI_OFFSET(r) CFI_OFFSET_DWARF_REG(r, r) .text .cfi_startproc .cfi_signal_frame .cfi_def_cfa _REG_R30, -SIZEOF_SIGTRAMP + SIZEOF_SIGINFO + _UC_GREGS 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_R12) CFI_OFFSET(_REG_R13) CFI_OFFSET(_REG_R14) CFI_OFFSET(_REG_R15) CFI_OFFSET(_REG_R16) CFI_OFFSET(_REG_R17) CFI_OFFSET(_REG_R18) CFI_OFFSET(_REG_R19) CFI_OFFSET(_REG_R20) CFI_OFFSET(_REG_R21) CFI_OFFSET(_REG_R22) CFI_OFFSET(_REG_R23) CFI_OFFSET(_REG_R24) CFI_OFFSET(_REG_R25) CFI_OFFSET(_REG_R26) CFI_OFFSET(_REG_R27) CFI_OFFSET(_REG_R28) CFI_OFFSET(_REG_R29) CFI_OFFSET(_REG_R30) CFI_OFFSET(_REG_R31) .cfi_return_column DWARF_SIGRETURN_REG CFI_OFFSET_DWARF_REG(DWARF_SIGRETURN_REG, _REG_PCOQH) /* * The unwind entry includes one instruction slot prior to the trampoline * because the unwinder will look up to (return PC - 1 insn) 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. */ nop ENTRY_NOPROFILE(__sigtramp_siginfo_2, 0) .call /* * Our sendsig() places the address of the signal handler in %arg3. * It may actually be a PLABEL. */ bb,>=,n %arg3, 30, L$sigcode_bounce ; branch if not a PLABEL depi 0, 31, 2, %arg3 ; zero L bit in PLABEL pointer ldw 4(%arg3), %r19 ; load shared library linkage ldw 0(%arg3), %arg3 ; load real catcher address L$sigcode_bounce: /* * This blr puts the address of the following nop in rp. * It also schedules the nop for execution, which is why * that instruction has to be a nop, or, rather, not any * instruction only meant to execute once the signal handler * returns. */ blr %r0, %rp /* * This bv schedules the instruction pointed to by arg3 * for execution. So, arg3 is the address of the signal * handler. */ bv,n %r0(%arg3) nop /* * The signal handler has returned. Since r3 is on the list * of callee-saved registers, it's whatever the sendsig * code wanted it set to. Since we copy it into arg0, * it looks like sendsig leaves r3 holding the desired * single argument to sys_setcontext, i.e., the ucontext_t *. */ /* Make a SYS_setcontext system call. */ copy %r3, %arg0 ldil L%SYSCALLGATE, %r1 .call ble 4(%sr2, %r1) ldi SYS_setcontext, %t1 /* Make a SYS_exit system call. */ copy %ret0, %arg0 ldil L%SYSCALLGATE, %r1 .call ble 4(%sr2, %r1) ldi SYS_exit, %t1 .cfi_endproc EXIT(__sigtramp_siginfo_2)
