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
|
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (linux || freebsd) && riscv64
package runtime
import (
"internal/abi"
"internal/goarch"
"unsafe"
)
func dumpregs(c *sigctxt) {
print("ra ", hex(c.ra()), "\t")
print("sp ", hex(c.sp()), "\n")
print("gp ", hex(c.gp()), "\t")
print("tp ", hex(c.tp()), "\n")
print("t0 ", hex(c.t0()), "\t")
print("t1 ", hex(c.t1()), "\n")
print("t2 ", hex(c.t2()), "\t")
print("s0 ", hex(c.s0()), "\n")
print("s1 ", hex(c.s1()), "\t")
print("a0 ", hex(c.a0()), "\n")
print("a1 ", hex(c.a1()), "\t")
print("a2 ", hex(c.a2()), "\n")
print("a3 ", hex(c.a3()), "\t")
print("a4 ", hex(c.a4()), "\n")
print("a5 ", hex(c.a5()), "\t")
print("a6 ", hex(c.a6()), "\n")
print("a7 ", hex(c.a7()), "\t")
print("s2 ", hex(c.s2()), "\n")
print("s3 ", hex(c.s3()), "\t")
print("s4 ", hex(c.s4()), "\n")
print("s5 ", hex(c.s5()), "\t")
print("s6 ", hex(c.s6()), "\n")
print("s7 ", hex(c.s7()), "\t")
print("s8 ", hex(c.s8()), "\n")
print("s9 ", hex(c.s9()), "\t")
print("s10 ", hex(c.s10()), "\n")
print("s11 ", hex(c.s11()), "\t")
print("t3 ", hex(c.t3()), "\n")
print("t4 ", hex(c.t4()), "\t")
print("t5 ", hex(c.t5()), "\n")
print("t6 ", hex(c.t6()), "\t")
print("pc ", hex(c.pc()), "\n")
}
//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
func (c *sigctxt) siglr() uintptr { return uintptr(c.ra()) }
func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
// We arrange RA, and pc to pretend the panicking
// function calls sigpanic directly.
// Always save RA to stack so that panics in leaf
// functions are correctly handled. This smashes
// the stack frame but we're not going back there
// anyway.
sp := c.sp() - goarch.PtrSize
c.set_sp(sp)
*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra()
pc := gp.sigpc
if shouldPushSigpanic(gp, pc, uintptr(c.ra())) {
// Make it look the like faulting PC called sigpanic.
c.set_ra(uint64(pc))
}
// In case we are panicking from external C code
c.set_gp(uint64(uintptr(unsafe.Pointer(gp))))
c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic)))
}
func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
// Push the LR to stack, as we'll clobber it in order to
// push the call. The function being pushed is responsible
// for restoring the LR and setting the SP back.
// This extra slot is known to gentraceback.
sp := c.sp() - goarch.PtrSize
c.set_sp(sp)
*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra()
// Set up PC and LR to pretend the function being signaled
// calls targetPC at resumePC.
c.set_ra(uint64(resumePC))
c.set_pc(uint64(targetPC))
}
|
