/* $NetBSD: __sigtramp2.S,v 1.5 2021/11/27 10:00:01 skrll Exp $ */ /*- * Copyright (c) 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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" #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: __sigtramp2.S,v 1.5 2021/11/27 10:00:01 skrll Exp $") #endif /* LIBC_SCCS && !lint */ /* * On entry to user space, stack and registers look like: * * r3 signal number * r4 pointer to siginfo structure * r5 pointer to ucontext structure * r30 pointer to ucontext structure * srr0 address of handler * lr address of this trampoline * * We use r30 as the CFA base register since it's been conveniently set up * for us that way. The DWARF register numbers used in the .eh_frame are: * * 0 - 31 GPRs * 32 - 63 FPRs * 65 LR * 66 CTR * 68-75 CRs * 76 XER * 77 - 108 AltiVec regs * 99 signal trampoline return address * 109 VRSAVE * 110 VCSR * * N.B. Only one CR slot is used (CR2) in the SVR4 ABI. */ #define DWARF_LR_REG 65 #define DWARF_CTR_REG 66 #define DWARF_CR2_REG 70 #define DWARF_XER_REG 76 #define DWARF_SIGRETURN_REG 99 #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 simple .cfi_signal_frame .cfi_def_cfa _REG_R30, 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_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_OFFSET_DWARF_REG(DWARF_CR2_REG, _REG_CR) CFI_OFFSET_DWARF_REG(DWARF_LR_REG, _REG_LR) CFI_OFFSET_DWARF_REG(DWARF_CTR_REG, _REG_CTR) CFI_OFFSET_DWARF_REG(DWARF_XER_REG, _REG_XER) .cfi_return_column DWARF_SIGRETURN_REG CFI_OFFSET_DWARF_REG(DWARF_SIGRETURN_REG, _REG_PC) /* * 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) mr %r3,%r30 /* restore ucontext pointer */ _DOSYSCALL(setcontext) /* restore machine state */ _DOSYSCALL(exit) /* or exit with errno if failed */ .cfi_endproc END(__sigtramp_siginfo_2)
