// 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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//go:nosplit
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//go:nowritebarrierrec
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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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//go:nosplit
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//go:nowritebarrierrec
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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() uintptr { return uintptr(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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