The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/sigtramp.S

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    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  * $FreeBSD$
   32  */
   33 
   34 #include <sys/syscall.h>
   35 #include <machine/asmacros.h>
   36 
   37 #include "assym.inc"
   38 
   39         .text
   40 /*
   41  * Signal trampoline, mapped as vdso into shared page.
   42  */
   43 ENTRY(__vdso_sigcode)
   44         .cfi_startproc
   45         .cfi_signal_frame
   46         .cfi_def_cfa    %rsp, 0
   47         .cfi_offset     %rdi, SIGF_UC + UC_RDI
   48         .cfi_offset     %rsi, SIGF_UC + UC_RSI
   49         .cfi_offset     %rdx, SIGF_UC + UC_RDX
   50         .cfi_offset     %rcx, SIGF_UC + UC_RCX
   51         .cfi_offset     %r8,  SIGF_UC + UC_R8
   52         .cfi_offset     %r9,  SIGF_UC + UC_R9
   53         .cfi_offset     %rax, SIGF_UC + UC_RAX
   54         .cfi_offset     %rbx, SIGF_UC + UC_RBX
   55         .cfi_offset     %rbp, SIGF_UC + UC_RBP
   56         .cfi_offset     %r10, SIGF_UC + UC_R10
   57         .cfi_offset     %r11, SIGF_UC + UC_R11
   58         .cfi_offset     %r12, SIGF_UC + UC_R12
   59         .cfi_offset     %r13, SIGF_UC + UC_R13
   60         .cfi_offset     %r14, SIGF_UC + UC_R14
   61         .cfi_offset     %r15, SIGF_UC + UC_R15
   62 #if 0
   63 /*
   64  * Gnu as complains about %fs/%gs/%es/%ds registers offsets not being
   65  * multiple of 8, but gas + ld.bfd work for %cs/%ss.
   66  *
   67  * Clang IAS + ld.lld combination cannot handle any of the segment
   68  * registers.  Also, clang IAS does not know %rflags/%fs.base/%gs.base
   69  * registers names, use dwarf registers numbers from psABI directly.
   70  *
   71  * LLVM libunwind from stable/13 cannot parse register numbers higher
   72  * than 32.  Disable %rflags, %fs.base, and %gs.base annotations.
   73  */     
   74         .cfi_offset     %fs,  SIGF_UC + UC_FS
   75         .cfi_offset     %gs,  SIGF_UC + UC_GS
   76         .cfi_offset     %es,  SIGF_UC + UC_ES
   77         .cfi_offset     %ds,  SIGF_UC + UC_DS
   78 #endif
   79         .cfi_offset     %rip, SIGF_UC + UC_RIP
   80 #if 0
   81         .cfi_offset     %cs,  SIGF_UC + UC_CS
   82         .cfi_offset     49 /* %rflags */, SIGF_UC + UC_RFLAGS
   83 #endif
   84         .cfi_offset     %rsp, SIGF_UC + UC_RSP
   85 #if 0
   86         .cfi_offset     %ss,  SIGF_UC + UC_SS
   87         .cfi_offset     58 /* %fs.base */, SIGF_UC + UC_FSBASE
   88         .cfi_offset     59 /* %gs.base */, SIGF_UC + UC_GSBASE
   89 #endif
   90         call    *SIGF_HANDLER(%rsp)     /* call signal handler */
   91         lea     SIGF_UC(%rsp),%rdi      /* get ucontext_t */
   92         pushq   $0                      /* junk to fake return addr. */
   93         .cfi_def_cfa    %rsp, 8
   94         movq    $SYS_sigreturn,%rax
   95         syscall                         /* enter kernel with args */
   96 0:      hlt                             /* trap priviliged instruction */
   97         jmp     0b
   98         .cfi_endproc
   99 END(__vdso_sigcode)
  100 
  101         .section .note.GNU-stack,"",%progbits

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