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Source file src/runtime/signal_darwin_arm.go

Documentation: runtime

  // Copyright 2014 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() *regs32 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
  
  func (c *sigctxt) r0() uint32  { return c.regs().r[0] }
  func (c *sigctxt) r1() uint32  { return c.regs().r[1] }
  func (c *sigctxt) r2() uint32  { return c.regs().r[2] }
  func (c *sigctxt) r3() uint32  { return c.regs().r[3] }
  func (c *sigctxt) r4() uint32  { return c.regs().r[4] }
  func (c *sigctxt) r5() uint32  { return c.regs().r[5] }
  func (c *sigctxt) r6() uint32  { return c.regs().r[6] }
  func (c *sigctxt) r7() uint32  { return c.regs().r[7] }
  func (c *sigctxt) r8() uint32  { return c.regs().r[8] }
  func (c *sigctxt) r9() uint32  { return c.regs().r[9] }
  func (c *sigctxt) r10() uint32 { return c.regs().r[10] }
  func (c *sigctxt) fp() uint32  { return c.regs().r[11] }
  func (c *sigctxt) ip() uint32  { return c.regs().r[12] }
  func (c *sigctxt) sp() uint32  { return c.regs().sp }
  func (c *sigctxt) lr() uint32  { return c.regs().lr }
  
  //go:nosplit
  //go:nowritebarrierrec
  func (c *sigctxt) pc() uint32 { return c.regs().pc }
  
  func (c *sigctxt) cpsr() uint32    { return c.regs().cpsr }
  func (c *sigctxt) fault() uint32   { return c.info.si_addr }
  func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
  func (c *sigctxt) trap() uint32    { return 0 }
  func (c *sigctxt) error() uint32   { return 0 }
  func (c *sigctxt) oldmask() uint32 { return 0 }
  
  func (c *sigctxt) set_pc(x uint32)  { c.regs().pc = x }
  func (c *sigctxt) set_sp(x uint32)  { c.regs().sp = x }
  func (c *sigctxt) set_lr(x uint32)  { c.regs().lr = x }
  func (c *sigctxt) set_r10(x uint32) { c.regs().r[10] = x }
  
  func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
  func (c *sigctxt) set_sigaddr(x uint32) { c.info.si_addr = x }
  
  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 != 0xe7f001f0 {
  			// SIGTRAP on something other than breakpoint.
  			c.set_sigcode(_SI_USER)
  		}
  	}
  }
  

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