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https://github.com/golang/go
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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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux
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// +build mips64 mips64le
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package runtime
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import (
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"runtime/internal/sys"
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"unsafe"
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)
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type sigctxt struct {
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info *siginfo
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ctxt unsafe.Pointer
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}
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//go:nosplit
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//go:nowritebarrierrec
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func (c *sigctxt) regs() *sigcontext { return &(*ucontext)(c.ctxt).uc_mcontext }
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func (c *sigctxt) r0() uint64 { return c.regs().sc_regs[0] }
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func (c *sigctxt) r1() uint64 { return c.regs().sc_regs[1] }
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func (c *sigctxt) r2() uint64 { return c.regs().sc_regs[2] }
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func (c *sigctxt) r3() uint64 { return c.regs().sc_regs[3] }
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func (c *sigctxt) r4() uint64 { return c.regs().sc_regs[4] }
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func (c *sigctxt) r5() uint64 { return c.regs().sc_regs[5] }
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func (c *sigctxt) r6() uint64 { return c.regs().sc_regs[6] }
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func (c *sigctxt) r7() uint64 { return c.regs().sc_regs[7] }
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func (c *sigctxt) r8() uint64 { return c.regs().sc_regs[8] }
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func (c *sigctxt) r9() uint64 { return c.regs().sc_regs[9] }
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func (c *sigctxt) r10() uint64 { return c.regs().sc_regs[10] }
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func (c *sigctxt) r11() uint64 { return c.regs().sc_regs[11] }
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func (c *sigctxt) r12() uint64 { return c.regs().sc_regs[12] }
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func (c *sigctxt) r13() uint64 { return c.regs().sc_regs[13] }
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func (c *sigctxt) r14() uint64 { return c.regs().sc_regs[14] }
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func (c *sigctxt) r15() uint64 { return c.regs().sc_regs[15] }
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func (c *sigctxt) r16() uint64 { return c.regs().sc_regs[16] }
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func (c *sigctxt) r17() uint64 { return c.regs().sc_regs[17] }
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func (c *sigctxt) r18() uint64 { return c.regs().sc_regs[18] }
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func (c *sigctxt) r19() uint64 { return c.regs().sc_regs[19] }
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func (c *sigctxt) r20() uint64 { return c.regs().sc_regs[20] }
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func (c *sigctxt) r21() uint64 { return c.regs().sc_regs[21] }
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func (c *sigctxt) r22() uint64 { return c.regs().sc_regs[22] }
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func (c *sigctxt) r23() uint64 { return c.regs().sc_regs[23] }
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func (c *sigctxt) r24() uint64 { return c.regs().sc_regs[24] }
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func (c *sigctxt) r25() uint64 { return c.regs().sc_regs[25] }
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func (c *sigctxt) r26() uint64 { return c.regs().sc_regs[26] }
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func (c *sigctxt) r27() uint64 { return c.regs().sc_regs[27] }
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func (c *sigctxt) r28() uint64 { return c.regs().sc_regs[28] }
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func (c *sigctxt) r29() uint64 { return c.regs().sc_regs[29] }
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func (c *sigctxt) r30() uint64 { return c.regs().sc_regs[30] }
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func (c *sigctxt) r31() uint64 { return c.regs().sc_regs[31] }
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func (c *sigctxt) sp() uint64 { return c.regs().sc_regs[29] }
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//go:nosplit
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//go:nowritebarrierrec
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func (c *sigctxt) pc() uint64 { return c.regs().sc_pc }
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func (c *sigctxt) link() uint64 { return c.regs().sc_regs[31] }
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func (c *sigctxt) lo() uint64 { return c.regs().sc_mdlo }
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func (c *sigctxt) hi() uint64 { return c.regs().sc_mdhi }
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func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
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func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
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func (c *sigctxt) set_r28(x uint64) { c.regs().sc_regs[28] = x }
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func (c *sigctxt) set_r30(x uint64) { c.regs().sc_regs[30] = x }
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func (c *sigctxt) set_pc(x uint64) { c.regs().sc_pc = x }
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func (c *sigctxt) set_sp(x uint64) { c.regs().sc_regs[29] = x }
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func (c *sigctxt) set_link(x uint64) { c.regs().sc_regs[31] = x }
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func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
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func (c *sigctxt) set_sigaddr(x uint64) {
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*(*uintptr)(add(unsafe.Pointer(c.info), 2*sys.PtrSize)) = uintptr(x)
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}
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