1/*- 2 * Copyright (c) 2003 Peter Wemm <peter@freeBSD.org> 3 * All rights reserved. 4 * 5 * Copyright (c) 2021 The FreeBSD Foundation 6 * 7 * Portions of this software were developed by Konstantin Belousov 8 * under sponsorship from the FreeBSD Foundation. 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/syscall.h> 33#include <machine/asmacros.h> 34 35#include "assym.inc" 36 37 .text 38/* 39 * Signal trampoline, mapped as vdso into shared page. 40 */ 41ENTRY(__vdso_sigcode) 42 .cfi_startproc 43 .cfi_signal_frame 44 .cfi_def_cfa %rsp, 0 45 .cfi_offset %rdi, SIGF_UC + UC_RDI 46 .cfi_offset %rsi, SIGF_UC + UC_RSI 47 .cfi_offset %rdx, SIGF_UC + UC_RDX 48 .cfi_offset %rcx, SIGF_UC + UC_RCX 49 .cfi_offset %r8, SIGF_UC + UC_R8 50 .cfi_offset %r9, SIGF_UC + UC_R9 51 .cfi_offset %rax, SIGF_UC + UC_RAX 52 .cfi_offset %rbx, SIGF_UC + UC_RBX 53 .cfi_offset %rbp, SIGF_UC + UC_RBP 54 .cfi_offset %r10, SIGF_UC + UC_R10 55 .cfi_offset %r11, SIGF_UC + UC_R11 56 .cfi_offset %r12, SIGF_UC + UC_R12 57 .cfi_offset %r13, SIGF_UC + UC_R13 58 .cfi_offset %r14, SIGF_UC + UC_R14 59 .cfi_offset %r15, SIGF_UC + UC_R15 60#if 0 61/* 62 * Gnu as complains about %fs/%gs/%es/%ds registers offsets not being 63 * multiple of 8, but gas + ld.bfd work for %cs/%ss. 64 * 65 * Clang IAS + ld.lld combination cannot handle any of the segment 66 * registers. Also, clang IAS does not know %rflags/%fs.base/%gs.base 67 * registers names, use dwarf registers numbers from psABI directly. 68 * 69 * LLVM libunwind from stable/13 cannot parse register numbers higher 70 * than 32. Disable %rflags, %fs.base, and %gs.base annotations. 71 */ 72 .cfi_offset %fs, SIGF_UC + UC_FS 73 .cfi_offset %gs, SIGF_UC + UC_GS 74 .cfi_offset %es, SIGF_UC + UC_ES 75 .cfi_offset %ds, SIGF_UC + UC_DS 76#endif 77 .cfi_offset %rip, SIGF_UC + UC_RIP 78#if 0 79 .cfi_offset %cs, SIGF_UC + UC_CS 80 .cfi_offset 49 /* %rflags */, SIGF_UC + UC_RFLAGS 81#endif 82 .cfi_offset %rsp, SIGF_UC + UC_RSP 83#if 0 84 .cfi_offset %ss, SIGF_UC + UC_SS 85 .cfi_offset 58 /* %fs.base */, SIGF_UC + UC_FSBASE 86 .cfi_offset 59 /* %gs.base */, SIGF_UC + UC_GSBASE 87#endif 88 call *SIGF_HANDLER(%rsp) /* call signal handler */ 89 lea SIGF_UC(%rsp),%rdi /* get ucontext_t */ 90 pushq $0 /* junk to fake return addr. */ 91 .cfi_def_cfa %rsp, 8 92 movq $SYS_sigreturn,%rax 93 syscall /* enter kernel with args */ 940: hlt /* trap priviliged instruction */ 95 jmp 0b 96 .cfi_endproc 97END(__vdso_sigcode) 98 99 .section .note.GNU-stack,"",%progbits 100