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https://github.com/golang/go
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b2a950bb73
Rename "gothrow" to "throw" now that the C version of "throw" is no longer needed. This change is purely mechanical except in panic.go where the old version of "throw" has been deleted. sed -i "" 's/[[:<:]]gothrow[[:>:]]/throw/g' runtime/*.go Change-Id: Icf0752299c35958b92870a97111c67bcd9159dc3 Reviewed-on: https://go-review.googlesource.com/2150 Reviewed-by: Minux Ma <minux@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net>
55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
// Copyright 2013 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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// +build amd64 amd64p32 386
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package runtime
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import "unsafe"
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// adjust Gobuf as it if executed a call to fn with context ctxt
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// and then did an immediate gosave.
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func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
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sp := buf.sp
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if regSize > ptrSize {
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sp -= ptrSize
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*(*uintptr)(unsafe.Pointer(sp)) = 0
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}
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sp -= ptrSize
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*(*uintptr)(unsafe.Pointer(sp)) = buf.pc
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buf.sp = sp
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buf.pc = uintptr(fn)
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buf.ctxt = ctxt
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}
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// Called to rewind context saved during morestack back to beginning of function.
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// To help us, the linker emits a jmp back to the beginning right after the
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// call to morestack. We just have to decode and apply that jump.
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func rewindmorestack(buf *gobuf) {
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pc := (*[8]byte)(unsafe.Pointer(buf.pc))
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if pc[0] == 0xe9 { // jmp 4-byte offset
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buf.pc = buf.pc + 5 + uintptr(int64(*(*int32)(unsafe.Pointer(&pc[1]))))
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return
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}
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if pc[0] == 0xeb { // jmp 1-byte offset
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buf.pc = buf.pc + 2 + uintptr(int64(*(*int8)(unsafe.Pointer(&pc[1]))))
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return
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}
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if pc[0] == 0xcc {
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// This is a breakpoint inserted by gdb. We could use
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// runtime·findfunc to find the function. But if we
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// do that, then we will continue execution at the
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// function entry point, and we will not hit the gdb
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// breakpoint. So for this case we don't change
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// buf.pc, so that when we return we will execute
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// the jump instruction and carry on. This means that
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// stack unwinding may not work entirely correctly
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// (http://golang.org/issue/5723) but the user is
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// running under gdb anyhow.
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return
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}
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print("runtime: pc=", pc, " ", hex(pc[0]), " ", hex(pc[1]), " ", hex(pc[2]), " ", hex(pc[3]), " ", hex(pc[4]), "\n")
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throw("runtime: misuse of rewindmorestack")
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}
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