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https://github.com/golang/go
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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
66 lines
2.7 KiB
Go
66 lines
2.7 KiB
Go
// Copyright 2014 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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package runtime
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import "unsafe"
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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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func (c *sigctxt) regs() *regs32 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
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func (c *sigctxt) r0() uint32 { return c.regs().r[0] }
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func (c *sigctxt) r1() uint32 { return c.regs().r[1] }
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func (c *sigctxt) r2() uint32 { return c.regs().r[2] }
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func (c *sigctxt) r3() uint32 { return c.regs().r[3] }
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func (c *sigctxt) r4() uint32 { return c.regs().r[4] }
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func (c *sigctxt) r5() uint32 { return c.regs().r[5] }
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func (c *sigctxt) r6() uint32 { return c.regs().r[6] }
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func (c *sigctxt) r7() uint32 { return c.regs().r[7] }
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func (c *sigctxt) r8() uint32 { return c.regs().r[8] }
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func (c *sigctxt) r9() uint32 { return c.regs().r[9] }
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func (c *sigctxt) r10() uint32 { return c.regs().r[10] }
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func (c *sigctxt) fp() uint32 { return c.regs().r[11] }
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func (c *sigctxt) ip() uint32 { return c.regs().r[12] }
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func (c *sigctxt) sp() uint32 { return c.regs().sp }
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func (c *sigctxt) lr() uint32 { return c.regs().lr }
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func (c *sigctxt) pc() uint32 { return c.regs().pc }
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func (c *sigctxt) cpsr() uint32 { return c.regs().cpsr }
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func (c *sigctxt) fault() uint32 { return c.info.si_addr }
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func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
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func (c *sigctxt) trap() uint32 { return 0 }
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func (c *sigctxt) error() uint32 { return 0 }
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func (c *sigctxt) oldmask() uint32 { return 0 }
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func (c *sigctxt) set_pc(x uint32) { c.regs().pc = x }
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func (c *sigctxt) set_sp(x uint32) { c.regs().sp = x }
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func (c *sigctxt) set_lr(x uint32) { c.regs().lr = x }
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func (c *sigctxt) set_r10(x uint32) { c.regs().r[10] = 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 uint32) { c.info.si_addr = x }
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func (c *sigctxt) fixsigcode(sig uint32) {
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switch sig {
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case _SIGTRAP:
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// OS X sets c.sigcode() == TRAP_BRKPT unconditionally for all SIGTRAPs,
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// leaving no way to distinguish a breakpoint-induced SIGTRAP
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// from an asynchronous signal SIGTRAP.
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// They all look breakpoint-induced by default.
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// Try looking at the code to see if it's a breakpoint.
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// The assumption is that we're very unlikely to get an
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// asynchronous SIGTRAP at just the moment that the
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// PC started to point at unmapped memory.
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pc := uintptr(c.pc())
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// OS X will leave the pc just after the instruction.
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code := (*uint32)(unsafe.Pointer(pc - 4))
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if *code != 0xe7f001f0 {
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// SIGTRAP on something other than breakpoint.
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c.set_sigcode(_SI_USER)
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}
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}
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}
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