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https://github.com/golang/go
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0efc8b2188
Currently almost every function that deals with a *_func has to first look up the *moduledata for the module containing the function's entry point. This means we almost always do at least two identical module lookups whenever we deal with a *_func (one to get the *_func and another to get something from its module data) and sometimes several more. Fix this by making findfunc return a new funcInfo type that embeds *_func, but also includes the *moduledata, and making all of the functions that currently take a *_func instead take a funcInfo and use the already-found *moduledata. This transformation is trivial for the most part, since the *_func type is usually inferred. The annoying part is that we can no longer use nil to indicate failure, so this introduces a funcInfo.valid() method and replaces nil checks with calls to valid. Change-Id: I9b8075ef1c31185c1943596d96dec45c7ab5100f Reviewed-on: https://go-review.googlesource.com/37331 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
91 lines
2.9 KiB
Go
91 lines
2.9 KiB
Go
// Copyright 2014 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 linux darwin
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package runtime
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import (
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"runtime/internal/sys"
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"unsafe"
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)
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func dumpregs(c *sigctxt) {
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print("r0 ", hex(c.r0()), "\n")
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print("r1 ", hex(c.r1()), "\n")
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print("r2 ", hex(c.r2()), "\n")
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print("r3 ", hex(c.r3()), "\n")
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print("r4 ", hex(c.r4()), "\n")
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print("r5 ", hex(c.r5()), "\n")
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print("r6 ", hex(c.r6()), "\n")
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print("r7 ", hex(c.r7()), "\n")
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print("r8 ", hex(c.r8()), "\n")
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print("r9 ", hex(c.r9()), "\n")
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print("r10 ", hex(c.r10()), "\n")
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print("r11 ", hex(c.r11()), "\n")
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print("r12 ", hex(c.r12()), "\n")
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print("r13 ", hex(c.r13()), "\n")
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print("r14 ", hex(c.r14()), "\n")
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print("r15 ", hex(c.r15()), "\n")
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print("r16 ", hex(c.r16()), "\n")
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print("r17 ", hex(c.r17()), "\n")
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print("r18 ", hex(c.r18()), "\n")
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print("r19 ", hex(c.r19()), "\n")
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print("r20 ", hex(c.r20()), "\n")
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print("r21 ", hex(c.r21()), "\n")
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print("r22 ", hex(c.r22()), "\n")
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print("r23 ", hex(c.r23()), "\n")
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print("r24 ", hex(c.r24()), "\n")
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print("r25 ", hex(c.r25()), "\n")
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print("r26 ", hex(c.r26()), "\n")
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print("r27 ", hex(c.r27()), "\n")
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print("r28 ", hex(c.r28()), "\n")
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print("r29 ", hex(c.r29()), "\n")
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print("lr ", hex(c.lr()), "\n")
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print("sp ", hex(c.sp()), "\n")
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print("pc ", hex(c.pc()), "\n")
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print("fault ", hex(c.fault()), "\n")
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}
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//go:nosplit
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//go:nowritebarrierrec
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func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
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func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
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func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) }
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// preparePanic sets up the stack to look like a call to sigpanic.
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func (c *sigctxt) preparePanic(sig uint32, gp *g) {
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// We arrange lr, and pc to pretend the panicking
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// function calls sigpanic directly.
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// Always save LR to stack so that panics in leaf
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// functions are correctly handled. This smashes
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// the stack frame but we're not going back there
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// anyway.
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sp := c.sp() - sys.SpAlign // needs only sizeof uint64, but must align the stack
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c.set_sp(sp)
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*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
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pc := gp.sigpc
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// If we don't recognize the PC as code
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// but we do recognize the link register as code,
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// then assume this was a call to non-code and treat like
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// pc == 0, to make unwinding show the context.
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if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.lr())).valid() {
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pc = 0
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}
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// Don't bother saving PC if it's zero, which is
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// probably a call to a nil func: the old link register
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// is more useful in the stack trace.
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if pc != 0 {
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c.set_lr(uint64(pc))
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}
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// In case we are panicking from external C code
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c.set_r28(uint64(uintptr(unsafe.Pointer(gp))))
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c.set_pc(uint64(funcPC(sigpanic)))
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}
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