qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-19 15:54:46 -07:00
Code Releases Activity
8fd7c11d59
go/src/runtime/signal_darwin_386.go

57 lines
2.3 KiB
Go
Raw Normal View History

[dev.cc] runtime: convert signal handlers from C to Go This code overused macros and could not be converted automatically. Instead a new sigctxt type had to be defined for each os/arch combination, with a common (implicit) interface used by the arch-specific signal handler code. [This CL is part of the removal of C code from package runtime. See golang.org/s/dev.cc for an overview.] LGTM=r R=r CC=austin, dvyukov, golang-codereviews, iant, khr https://golang.org/cl/168500044
2014-11-11 15:05:55 -07:00
// Copyright 2013 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
}
func (c *sigctxt) regs() *regs32 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
func (c *sigctxt) eax() uint32 { return c.regs().eax }
func (c *sigctxt) ebx() uint32 { return c.regs().ebx }
func (c *sigctxt) ecx() uint32 { return c.regs().ecx }
func (c *sigctxt) edx() uint32 { return c.regs().edx }
func (c *sigctxt) edi() uint32 { return c.regs().edi }
func (c *sigctxt) esi() uint32 { return c.regs().esi }
func (c *sigctxt) ebp() uint32 { return c.regs().ebp }
func (c *sigctxt) esp() uint32 { return c.regs().esp }
func (c *sigctxt) eip() uint32 { return c.regs().eip }
func (c *sigctxt) eflags() uint32 { return c.regs().eflags }
func (c *sigctxt) cs() uint32 { return c.regs().cs }
func (c *sigctxt) fs() uint32 { return c.regs().fs }
func (c *sigctxt) gs() uint32 { return c.regs().gs }
func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
runtime: use uintXX instead of *byte for si_addr on Darwin Currently, Darwin's siginfo type uses *byte for the si_addr field. This results in unwanted write barriers in set_sigaddr. It's also pointless since it never points to anything real and the get/set methods return/take uintXX and cast it from/to the pointer. All other arches use a uint type for this field. Change Darwin to match. This simplifies the get/set methods and eliminates the unwanted write barriers. Change-Id: Ifdb5646d35e1f2f6808b87a3d59745ec9718add1 Reviewed-on: https://go-review.googlesource.com/8086 Reviewed-by: Austin Clements <austin@google.com>
2015-03-26 10:14:26 -06:00
func (c *sigctxt) sigaddr() uint32 { return c.info.si_addr }
[dev.cc] runtime: convert signal handlers from C to Go This code overused macros and could not be converted automatically. Instead a new sigctxt type had to be defined for each os/arch combination, with a common (implicit) interface used by the arch-specific signal handler code. [This CL is part of the removal of C code from package runtime. See golang.org/s/dev.cc for an overview.] LGTM=r R=r CC=austin, dvyukov, golang-codereviews, iant, khr https://golang.org/cl/168500044
2014-11-11 15:05:55 -07:00
func (c *sigctxt) set_eip(x uint32) { c.regs().eip = x }
func (c *sigctxt) set_esp(x uint32) { c.regs().esp = x }
func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
runtime: use uintXX instead of *byte for si_addr on Darwin Currently, Darwin's siginfo type uses *byte for the si_addr field. This results in unwanted write barriers in set_sigaddr. It's also pointless since it never points to anything real and the get/set methods return/take uintXX and cast it from/to the pointer. All other arches use a uint type for this field. Change Darwin to match. This simplifies the get/set methods and eliminates the unwanted write barriers. Change-Id: Ifdb5646d35e1f2f6808b87a3d59745ec9718add1 Reviewed-on: https://go-review.googlesource.com/8086 Reviewed-by: Austin Clements <austin@google.com>
2015-03-26 10:14:26 -06:00
func (c *sigctxt) set_sigaddr(x uint32) { c.info.si_addr = x }
runtime: fix up OS X kernel bug sending user-generated SIGTRAP OS X unconditionally sets si_code = TRAP_BRKPT when sending SIGTRAP, even if it was generated by kill -TRAP and not a breakpoint. Correct the si_code by looking to see if the PC is after a breakpoint. For #12906. Change-Id: I998c2499f7f12b338e607282a325b045f1f4f690 Reviewed-on: https://go-review.googlesource.com/18347 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2016-01-06 21:00:08 -07:00
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.eip())
// OS X will leave the pc just after the INT 3 instruction.
// INT 3 is usually 1 byte, but there is a 2-byte form.
code := (*[2]byte)(unsafe.Pointer(pc - 2))
if code[1] != 0xCC && (code[0] != 0xCD || code[1] != 3) {
// SIGTRAP on something other than INT 3.
c.set_sigcode(_SI_USER)
}
}
}
Copy Permalink