/* $NetBSD: __sigtramp2.S,v 1.5 2024/05/30 15:56:43 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(SYSLIBC_SCCS) && !defined(lint) RCSID("$NetBSD: __sigtramp2.S,v 1.5 2024/05/30 15:56:43 skrll Exp $") #endif /* SYSLIBC_SCCS and not lint */ /* * The RISC-V signal trampoline is invoked only to return from * the signal; the kernel calls the signal handler directly. * * On entry, stack looks like: * * sp -> siginfo_t structure * sp + SIGINFO_SIZE -> ucontext_t structure * * The DWARF register numbers for the general purpose registers are the * same as the architected register numbers. For RISC-V, there is a DWARF * pseudo-register for signal handler return address. */ #if defined(__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__) #define DWARF_SIGRETURN_REG __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__ #else #define DWARF_SIGRETURN_REG 64 #endif .text .cfi_startproc .cfi_signal_frame .cfi_def_cfa sp, SIGINFO_SIZE .cfi_offset ra, UC_GREGS_RA .cfi_offset sp, UC_GREGS_SP .cfi_offset gp, UC_GREGS_GP .cfi_offset tp, UC_GREGS_TP .cfi_offset t0, UC_GREGS_T0 .cfi_offset t1, UC_GREGS_T1 .cfi_offset t2, UC_GREGS_T2 .cfi_offset s0, UC_GREGS_S0 .cfi_offset s1, UC_GREGS_S1 .cfi_offset a0, UC_GREGS_A0 .cfi_offset a1, UC_GREGS_A1 .cfi_offset a2, UC_GREGS_A2 .cfi_offset a3, UC_GREGS_A3 .cfi_offset a4, UC_GREGS_A4 .cfi_offset a5, UC_GREGS_A5 .cfi_offset a6, UC_GREGS_A6 .cfi_offset a7, UC_GREGS_A7 .cfi_offset s2, UC_GREGS_S2 .cfi_offset s3, UC_GREGS_S3 .cfi_offset s4, UC_GREGS_S4 .cfi_offset s5, UC_GREGS_S5 .cfi_offset s6, UC_GREGS_S6 .cfi_offset s7, UC_GREGS_S7 .cfi_offset s8, UC_GREGS_S8 .cfi_offset s9, UC_GREGS_S9 .cfi_offset s10, UC_GREGS_S10 .cfi_offset s11, UC_GREGS_S11 .cfi_offset t3, UC_GREGS_T3 .cfi_offset t4, UC_GREGS_T4 .cfi_offset t5, UC_GREGS_T5 .cfi_offset t6, UC_GREGS_T6 .cfi_return_column DWARF_SIGRETURN_REG .cfi_offset DWARF_SIGRETURN_REG, UC_GREGS_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_NP(__sigtramp_siginfo_2) addi a0, sp, SIGINFO_SIZE /* address of ucontext */ SYSTRAP_NOERROR(setcontext) /* and do setcontext */ SYSTRAP(exit) /* if sigreturn fails */ .cfi_endproc END(__sigtramp_siginfo_2)
