1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* $NetBSD: __sigtramp2.S,v 1.5 2022/04/07 20:23:44 andvar 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 2022/04/07 20:23:44 andvar Exp $")
#endif /* SYSLIBC_SCCS and not lint */
/*
* The MIPS signal trampoline is invoked only to return from
* the signal; the kernel calls the signal handler directly.
*
* On entry, stack looks like:
*
* ucontext structure sp + sizeof(siginfo_t)
* sp-> siginfo structure
*
* The DWARF register numbers for the general purpose registers are the
* same as the architected register numbers. For MIPS, there is a DWARF
* pseudo-register for signal handler return addresses, as well as for the
* MDLO and MDHI registers.
*/
#define DWARF_MDHI_REG 64
#define DWARF_MDLO_REG 65
#if defined(__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__)
#define DWARF_SIGRETURN_REG __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
#else
#define DWARF_SIGRETURN_REG 66
#endif
#define CFI_OFFSET_DWARF_REG(d, r) .cfi_offset d, r * SZREG
#define CFI_OFFSET(r) CFI_OFFSET_DWARF_REG(r, r)
.text
.cfi_startproc
.cfi_signal_frame
.cfi_def_cfa _REG_SP, SIGINFO_SIZE + _UC_GREGS
CFI_OFFSET(_REG_R0)
CFI_OFFSET(_REG_AT)
CFI_OFFSET(_REG_V0)
CFI_OFFSET(_REG_V1)
CFI_OFFSET(_REG_A0)
CFI_OFFSET(_REG_A1)
CFI_OFFSET(_REG_A2)
CFI_OFFSET(_REG_A3)
CFI_OFFSET(_REG_T0)
CFI_OFFSET(_REG_T1)
CFI_OFFSET(_REG_T2)
CFI_OFFSET(_REG_T3)
CFI_OFFSET(_REG_T4)
CFI_OFFSET(_REG_T5)
CFI_OFFSET(_REG_T6)
CFI_OFFSET(_REG_T7)
CFI_OFFSET(_REG_S0)
CFI_OFFSET(_REG_S1)
CFI_OFFSET(_REG_S2)
CFI_OFFSET(_REG_S3)
CFI_OFFSET(_REG_S4)
CFI_OFFSET(_REG_S5)
CFI_OFFSET(_REG_S6)
CFI_OFFSET(_REG_S7)
CFI_OFFSET(_REG_T8)
CFI_OFFSET(_REG_T9)
CFI_OFFSET(_REG_K0)
CFI_OFFSET(_REG_K1)
CFI_OFFSET(_REG_GP)
CFI_OFFSET(_REG_SP)
CFI_OFFSET(_REG_S8)
CFI_OFFSET(_REG_RA)
CFI_OFFSET_DWARF_REG(DWARF_MDHI_REG, _REG_MDHI)
CFI_OFFSET_DWARF_REG(DWARF_MDLO_REG, _REG_MDLO)
.cfi_return_column DWARF_SIGRETURN_REG
CFI_OFFSET_DWARF_REG(DWARF_SIGRETURN_REG, _REG_EPC)
/*
* 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
LEAF_NOPROFILE(__sigtramp_siginfo_2)
PTR_ADDU a0, sp, SIGINFO_SIZE /* address of ucontext */
SYSTRAP(setcontext) /* and do setcontext */
move a0, v0 /* exit with errno */
SYSTRAP(exit) /* if sigreturn fails */
.cfi_endproc
END(__sigtramp_siginfo_2)
|