mirror of
https://github.com/golang/go
synced 2024-10-02 04:18:33 -06:00
e5186895fc
preparePanic must set all registers expected by Go runtime conventions in case the sigpanic is being injected into C code. However, on mips64x it fails to restore RSB (R28). As a result, if C code modifies RSB and then raises a signal that turns into a sigpanic call, sigpanic may crash when it attempts to lock runtime.debuglock (the first global it references). Fix this by restoring RSB in the signal context using the same convention as main and sigtramp. Fixes #23641. Change-Id: Ib47e83df89e2a3eece10f480e4e91ce9e4424388 Reviewed-on: https://go-review.googlesource.com/91156 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
79 lines
3.4 KiB
Go
79 lines
3.4 KiB
Go
// Copyright 2015 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.
|
|
|
|
// +build linux
|
|
// +build mips64 mips64le
|
|
|
|
package runtime
|
|
|
|
import (
|
|
"runtime/internal/sys"
|
|
"unsafe"
|
|
)
|
|
|
|
type sigctxt struct {
|
|
info *siginfo
|
|
ctxt unsafe.Pointer
|
|
}
|
|
|
|
//go:nosplit
|
|
//go:nowritebarrierrec
|
|
func (c *sigctxt) regs() *sigcontext { return &(*ucontext)(c.ctxt).uc_mcontext }
|
|
|
|
func (c *sigctxt) r0() uint64 { return c.regs().sc_regs[0] }
|
|
func (c *sigctxt) r1() uint64 { return c.regs().sc_regs[1] }
|
|
func (c *sigctxt) r2() uint64 { return c.regs().sc_regs[2] }
|
|
func (c *sigctxt) r3() uint64 { return c.regs().sc_regs[3] }
|
|
func (c *sigctxt) r4() uint64 { return c.regs().sc_regs[4] }
|
|
func (c *sigctxt) r5() uint64 { return c.regs().sc_regs[5] }
|
|
func (c *sigctxt) r6() uint64 { return c.regs().sc_regs[6] }
|
|
func (c *sigctxt) r7() uint64 { return c.regs().sc_regs[7] }
|
|
func (c *sigctxt) r8() uint64 { return c.regs().sc_regs[8] }
|
|
func (c *sigctxt) r9() uint64 { return c.regs().sc_regs[9] }
|
|
func (c *sigctxt) r10() uint64 { return c.regs().sc_regs[10] }
|
|
func (c *sigctxt) r11() uint64 { return c.regs().sc_regs[11] }
|
|
func (c *sigctxt) r12() uint64 { return c.regs().sc_regs[12] }
|
|
func (c *sigctxt) r13() uint64 { return c.regs().sc_regs[13] }
|
|
func (c *sigctxt) r14() uint64 { return c.regs().sc_regs[14] }
|
|
func (c *sigctxt) r15() uint64 { return c.regs().sc_regs[15] }
|
|
func (c *sigctxt) r16() uint64 { return c.regs().sc_regs[16] }
|
|
func (c *sigctxt) r17() uint64 { return c.regs().sc_regs[17] }
|
|
func (c *sigctxt) r18() uint64 { return c.regs().sc_regs[18] }
|
|
func (c *sigctxt) r19() uint64 { return c.regs().sc_regs[19] }
|
|
func (c *sigctxt) r20() uint64 { return c.regs().sc_regs[20] }
|
|
func (c *sigctxt) r21() uint64 { return c.regs().sc_regs[21] }
|
|
func (c *sigctxt) r22() uint64 { return c.regs().sc_regs[22] }
|
|
func (c *sigctxt) r23() uint64 { return c.regs().sc_regs[23] }
|
|
func (c *sigctxt) r24() uint64 { return c.regs().sc_regs[24] }
|
|
func (c *sigctxt) r25() uint64 { return c.regs().sc_regs[25] }
|
|
func (c *sigctxt) r26() uint64 { return c.regs().sc_regs[26] }
|
|
func (c *sigctxt) r27() uint64 { return c.regs().sc_regs[27] }
|
|
func (c *sigctxt) r28() uint64 { return c.regs().sc_regs[28] }
|
|
func (c *sigctxt) r29() uint64 { return c.regs().sc_regs[29] }
|
|
func (c *sigctxt) r30() uint64 { return c.regs().sc_regs[30] }
|
|
func (c *sigctxt) r31() uint64 { return c.regs().sc_regs[31] }
|
|
func (c *sigctxt) sp() uint64 { return c.regs().sc_regs[29] }
|
|
|
|
//go:nosplit
|
|
//go:nowritebarrierrec
|
|
func (c *sigctxt) pc() uint64 { return c.regs().sc_pc }
|
|
|
|
func (c *sigctxt) link() uint64 { return c.regs().sc_regs[31] }
|
|
func (c *sigctxt) lo() uint64 { return c.regs().sc_mdlo }
|
|
func (c *sigctxt) hi() uint64 { return c.regs().sc_mdhi }
|
|
|
|
func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
|
|
func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
|
|
|
|
func (c *sigctxt) set_r28(x uint64) { c.regs().sc_regs[28] = x }
|
|
func (c *sigctxt) set_r30(x uint64) { c.regs().sc_regs[30] = x }
|
|
func (c *sigctxt) set_pc(x uint64) { c.regs().sc_pc = x }
|
|
func (c *sigctxt) set_sp(x uint64) { c.regs().sc_regs[29] = x }
|
|
func (c *sigctxt) set_link(x uint64) { c.regs().sc_regs[31] = x }
|
|
|
|
func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
|
|
func (c *sigctxt) set_sigaddr(x uint64) {
|
|
*(*uintptr)(add(unsafe.Pointer(c.info), 2*sys.PtrSize)) = uintptr(x)
|
|
}
|