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// 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.
package runtime
import "unsafe"
type sigctxt struct {
info *siginfo
ctxt unsafe.Pointer
}
//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) regs() *regs64 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
func (c *sigctxt) r0() uint64 { return c.regs().x[0] }
func (c *sigctxt) r1() uint64 { return c.regs().x[1] }
func (c *sigctxt) r2() uint64 { return c.regs().x[2] }
func (c *sigctxt) r3() uint64 { return c.regs().x[3] }
func (c *sigctxt) r4() uint64 { return c.regs().x[4] }
func (c *sigctxt) r5() uint64 { return c.regs().x[5] }
func (c *sigctxt) r6() uint64 { return c.regs().x[6] }
func (c *sigctxt) r7() uint64 { return c.regs().x[7] }
func (c *sigctxt) r8() uint64 { return c.regs().x[8] }
func (c *sigctxt) r9() uint64 { return c.regs().x[9] }
func (c *sigctxt) r10() uint64 { return c.regs().x[10] }
func (c *sigctxt) r11() uint64 { return c.regs().x[11] }
func (c *sigctxt) r12() uint64 { return c.regs().x[12] }
func (c *sigctxt) r13() uint64 { return c.regs().x[13] }
func (c *sigctxt) r14() uint64 { return c.regs().x[14] }
func (c *sigctxt) r15() uint64 { return c.regs().x[15] }
func (c *sigctxt) r16() uint64 { return c.regs().x[16] }
func (c *sigctxt) r17() uint64 { return c.regs().x[17] }
func (c *sigctxt) r18() uint64 { return c.regs().x[18] }
func (c *sigctxt) r19() uint64 { return c.regs().x[19] }
func (c *sigctxt) r20() uint64 { return c.regs().x[20] }
func (c *sigctxt) r21() uint64 { return c.regs().x[21] }
func (c *sigctxt) r22() uint64 { return c.regs().x[22] }
func (c *sigctxt) r23() uint64 { return c.regs().x[23] }
func (c *sigctxt) r24() uint64 { return c.regs().x[24] }
func (c *sigctxt) r25() uint64 { return c.regs().x[25] }
func (c *sigctxt) r26() uint64 { return c.regs().x[26] }
func (c *sigctxt) r27() uint64 { return c.regs().x[27] }
func (c *sigctxt) r28() uint64 { return c.regs().x[28] }
func (c *sigctxt) r29() uint64 { return c.regs().fp }
func (c *sigctxt) lr() uint64 { return c.regs().lr }
func (c *sigctxt) sp() uint64 { return c.regs().sp }
//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uint64 { return c.regs().pc }
func (c *sigctxt) fault() uintptr { return uintptr(unsafe.Pointer(c.info.si_addr)) }
func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 { return uint64(uintptr(unsafe.Pointer(c.info.si_addr))) }
func (c *sigctxt) set_pc(x uint64) { c.regs().pc = x }
func (c *sigctxt) set_sp(x uint64) { c.regs().sp = x }
func (c *sigctxt) set_lr(x uint64) { c.regs().lr = x }
func (c *sigctxt) set_r28(x uint64) { c.regs().x[28] = x }
func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }
func (c *sigctxt) set_sigaddr(x uint64) {
c.info.si_addr = (*byte)(unsafe.Pointer(uintptr(x)))
}
//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
switch sig {
case _SIGTRAP:
// OS X sets c.sigcode() == TRAP_BRKPT unconditionally for all SIGTRAPs,
// leaving no way to distinguish a breakpoint-induced SIGTRAP
// from an asynchronous signal SIGTRAP.
// They all look breakpoint-induced by default.
// Try looking at the code to see if it's a breakpoint.
// The assumption is that we're very unlikely to get an
// asynchronous SIGTRAP at just the moment that the
// PC started to point at unmapped memory.
pc := uintptr(c.pc())
// OS X will leave the pc just after the instruction.
code := (*uint32)(unsafe.Pointer(pc - 4))
if *code != 0xd4200000 {
// SIGTRAP on something other than breakpoint.
c.set_sigcode(_SI_USER)
}
}
}
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