1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build linux
6// +build mips64 mips64le
7
8package runtime
9
10import (
11	"runtime/internal/sys"
12	"unsafe"
13)
14
15func dumpregs(c *sigctxt) {
16	print("r0   ", hex(c.r0()), "\t")
17	print("r1   ", hex(c.r1()), "\n")
18	print("r2   ", hex(c.r2()), "\t")
19	print("r3   ", hex(c.r3()), "\n")
20	print("r4   ", hex(c.r4()), "\t")
21	print("r5   ", hex(c.r5()), "\n")
22	print("r6   ", hex(c.r6()), "\t")
23	print("r7   ", hex(c.r7()), "\n")
24	print("r8   ", hex(c.r8()), "\t")
25	print("r9   ", hex(c.r9()), "\n")
26	print("r10  ", hex(c.r10()), "\t")
27	print("r11  ", hex(c.r11()), "\n")
28	print("r12  ", hex(c.r12()), "\t")
29	print("r13  ", hex(c.r13()), "\n")
30	print("r14  ", hex(c.r14()), "\t")
31	print("r15  ", hex(c.r15()), "\n")
32	print("r16  ", hex(c.r16()), "\t")
33	print("r17  ", hex(c.r17()), "\n")
34	print("r18  ", hex(c.r18()), "\t")
35	print("r19  ", hex(c.r19()), "\n")
36	print("r20  ", hex(c.r20()), "\t")
37	print("r21  ", hex(c.r21()), "\n")
38	print("r22  ", hex(c.r22()), "\t")
39	print("r23  ", hex(c.r23()), "\n")
40	print("r24  ", hex(c.r24()), "\t")
41	print("r25  ", hex(c.r25()), "\n")
42	print("r26  ", hex(c.r26()), "\t")
43	print("r27  ", hex(c.r27()), "\n")
44	print("r28  ", hex(c.r28()), "\t")
45	print("r29  ", hex(c.r29()), "\n")
46	print("r30  ", hex(c.r30()), "\t")
47	print("r31  ", hex(c.r31()), "\n")
48	print("pc   ", hex(c.pc()), "\t")
49	print("link ", hex(c.link()), "\n")
50	print("lo   ", hex(c.lo()), "\t")
51	print("hi   ", hex(c.hi()), "\n")
52}
53
54//go:nosplit
55//go:nowritebarrierrec
56func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
57
58func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
59func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
60func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
61
62// preparePanic sets up the stack to look like a call to sigpanic.
63func (c *sigctxt) preparePanic(sig uint32, gp *g) {
64	// We arrange link, and pc to pretend the panicking
65	// function calls sigpanic directly.
66	// Always save LINK to stack so that panics in leaf
67	// functions are correctly handled. This smashes
68	// the stack frame but we're not going back there
69	// anyway.
70	sp := c.sp() - sys.PtrSize
71	c.set_sp(sp)
72	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
73
74	pc := gp.sigpc
75
76	// If we don't recognize the PC as code
77	// but we do recognize the link register as code,
78	// then assume this was a call to non-code and treat like
79	// pc == 0, to make unwinding show the context.
80	if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.link())).valid() {
81		pc = 0
82	}
83
84	// Don't bother saving PC if it's zero, which is
85	// probably a call to a nil func: the old link register
86	// is more useful in the stack trace.
87	if pc != 0 {
88		c.set_link(uint64(pc))
89	}
90
91	// In case we are panicking from external C code
92	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
93	c.set_pc(uint64(funcPC(sigpanic)))
94}
95