/*- * Copyright (c) 2003 Peter Wemm <peter@freeBSD.org> * All rights reserved. * * Copyright (c) 2021 The FreeBSD Foundation * * Portions of this software were developed by Konstantin Belousov * under sponsorship from the FreeBSD Foundation. * * 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 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 AUTHOR 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/syscall.h> #include <machine/asmacros.h> #include "assym.inc" .text /* * Signal trampoline, mapped as vdso into shared page. */ ENTRY(__vdso_sigcode) .cfi_startproc .cfi_signal_frame .cfi_def_cfa %rsp, 0 .cfi_offset %rdi, SIGF_UC + UC_RDI .cfi_offset %rsi, SIGF_UC + UC_RSI .cfi_offset %rdx, SIGF_UC + UC_RDX .cfi_offset %rcx, SIGF_UC + UC_RCX .cfi_offset %r8, SIGF_UC + UC_R8 .cfi_offset %r9, SIGF_UC + UC_R9 .cfi_offset %rax, SIGF_UC + UC_RAX .cfi_offset %rbx, SIGF_UC + UC_RBX .cfi_offset %rbp, SIGF_UC + UC_RBP .cfi_offset %r10, SIGF_UC + UC_R10 .cfi_offset %r11, SIGF_UC + UC_R11 .cfi_offset %r12, SIGF_UC + UC_R12 .cfi_offset %r13, SIGF_UC + UC_R13 .cfi_offset %r14, SIGF_UC + UC_R14 .cfi_offset %r15, SIGF_UC + UC_R15 #if 0 /* * Gnu as complains about %fs/%gs/%es/%ds registers offsets not being * multiple of 8, but gas + ld.bfd work for %cs/%ss. * * Clang IAS + ld.lld combination cannot handle any of the segment * registers. Also, clang IAS does not know %rflags/%fs.base/%gs.base * registers names, use dwarf registers numbers from psABI directly. * * LLVM libunwind from stable/13 cannot parse register numbers higher * than 32. Disable %rflags, %fs.base, and %gs.base annotations. */ .cfi_offset %fs, SIGF_UC + UC_FS .cfi_offset %gs, SIGF_UC + UC_GS .cfi_offset %es, SIGF_UC + UC_ES .cfi_offset %ds, SIGF_UC + UC_DS #endif .cfi_offset %rip, SIGF_UC + UC_RIP #if 0 .cfi_offset %cs, SIGF_UC + UC_CS .cfi_offset 49 /* %rflags */, SIGF_UC + UC_RFLAGS #endif .cfi_offset %rsp, SIGF_UC + UC_RSP #if 0 .cfi_offset %ss, SIGF_UC + UC_SS .cfi_offset 58 /* %fs.base */, SIGF_UC + UC_FSBASE .cfi_offset 59 /* %gs.base */, SIGF_UC + UC_GSBASE #endif call *SIGF_HANDLER(%rsp) /* call signal handler */ lea SIGF_UC(%rsp),%rdi /* get ucontext_t */ pushq $0 /* junk to fake return addr. */ .cfi_def_cfa %rsp, 8 movq $SYS_sigreturn,%rax syscall /* enter kernel with args */ 0: hlt /* trap privileged instruction */ jmp 0b .cfi_endproc END(__vdso_sigcode) .section .note.GNU-stack,"",%progbits
