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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