// 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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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() *regs64 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
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func (c *sigctxt) r0() uint64 { return c.regs().x[0] }
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func (c *sigctxt) r1() uint64 { return c.regs().x[1] }
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func (c *sigctxt) r2() uint64 { return c.regs().x[2] }
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func (c *sigctxt) r3() uint64 { return c.regs().x[3] }
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func (c *sigctxt) r4() uint64 { return c.regs().x[4] }
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func (c *sigctxt) r5() uint64 { return c.regs().x[5] }
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func (c *sigctxt) r6() uint64 { return c.regs().x[6] }
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func (c *sigctxt) r7() uint64 { return c.regs().x[7] }
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func (c *sigctxt) r8() uint64 { return c.regs().x[8] }
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func (c *sigctxt) r9() uint64 { return c.regs().x[9] }
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func (c *sigctxt) r10() uint64 { return c.regs().x[10] }
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func (c *sigctxt) r11() uint64 { return c.regs().x[11] }
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func (c *sigctxt) r12() uint64 { return c.regs().x[12] }
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func (c *sigctxt) r13() uint64 { return c.regs().x[13] }
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func (c *sigctxt) r14() uint64 { return c.regs().x[14] }
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func (c *sigctxt) r15() uint64 { return c.regs().x[15] }
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func (c *sigctxt) r16() uint64 { return c.regs().x[16] }
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func (c *sigctxt) r17() uint64 { return c.regs().x[17] }
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func (c *sigctxt) r18() uint64 { return c.regs().x[18] }
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func (c *sigctxt) r19() uint64 { return c.regs().x[19] }
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func (c *sigctxt) r20() uint64 { return c.regs().x[20] }
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func (c *sigctxt) r21() uint64 { return c.regs().x[21] }
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func (c *sigctxt) r22() uint64 { return c.regs().x[22] }
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func (c *sigctxt) r23() uint64 { return c.regs().x[23] }
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func (c *sigctxt) r24() uint64 { return c.regs().x[24] }
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func (c *sigctxt) r25() uint64 { return c.regs().x[25] }
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func (c *sigctxt) r26() uint64 { return c.regs().x[26] }
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func (c *sigctxt) r27() uint64 { return c.regs().x[27] }
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func (c *sigctxt) r28() uint64 { return c.regs().x[28] }
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func (c *sigctxt) r29() uint64 { return c.regs().fp }
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func (c *sigctxt) lr() uint64 { return c.regs().lr }
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func (c *sigctxt) sp() uint64 { return c.regs().sp }
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//go:nosplit
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//go:nowritebarrierrec
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func (c *sigctxt) pc() uint64 { return c.regs().pc }
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func (c *sigctxt) fault() uintptr { return uintptr(unsafe.Pointer(c.info.si_addr)) }
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func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
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func (c *sigctxt) sigaddr() uint64 { return uint64(uintptr(unsafe.Pointer(c.info.si_addr))) }
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func (c *sigctxt) set_pc(x uint64) { c.regs().pc = x }
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func (c *sigctxt) set_sp(x uint64) { c.regs().sp = x }
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func (c *sigctxt) set_lr(x uint64) { c.regs().lr = x }
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func (c *sigctxt) set_r28(x uint64) { c.regs().x[28] = x }
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func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }
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func (c *sigctxt) set_sigaddr(x uint64) {
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c.info.si_addr = (*byte)(unsafe.Pointer(uintptr(x)))
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}
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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 != 0xd4200000 {
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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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