From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:14:23 +0200 Subject: Adding upstream version 1.16.10. Signed-off-by: Daniel Baumann --- src/runtime/signal_arm.go | 78 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 src/runtime/signal_arm.go (limited to 'src/runtime/signal_arm.go') diff --git a/src/runtime/signal_arm.go b/src/runtime/signal_arm.go new file mode 100644 index 0000000..156d9d3 --- /dev/null +++ b/src/runtime/signal_arm.go @@ -0,0 +1,78 @@ +// Copyright 2009 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. + +// +build dragonfly freebsd linux netbsd openbsd + +package runtime + +import "unsafe" + +func dumpregs(c *sigctxt) { + print("trap ", hex(c.trap()), "\n") + print("error ", hex(c.error()), "\n") + print("oldmask ", hex(c.oldmask()), "\n") + print("r0 ", hex(c.r0()), "\n") + print("r1 ", hex(c.r1()), "\n") + print("r2 ", hex(c.r2()), "\n") + print("r3 ", hex(c.r3()), "\n") + print("r4 ", hex(c.r4()), "\n") + print("r5 ", hex(c.r5()), "\n") + print("r6 ", hex(c.r6()), "\n") + print("r7 ", hex(c.r7()), "\n") + print("r8 ", hex(c.r8()), "\n") + print("r9 ", hex(c.r9()), "\n") + print("r10 ", hex(c.r10()), "\n") + print("fp ", hex(c.fp()), "\n") + print("ip ", hex(c.ip()), "\n") + print("sp ", hex(c.sp()), "\n") + print("lr ", hex(c.lr()), "\n") + print("pc ", hex(c.pc()), "\n") + print("cpsr ", hex(c.cpsr()), "\n") + print("fault ", hex(c.fault()), "\n") +} + +//go:nosplit +//go:nowritebarrierrec +func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } + +func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } +func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) } + +// preparePanic sets up the stack to look like a call to sigpanic. +func (c *sigctxt) preparePanic(sig uint32, gp *g) { + // We arrange lr, and pc to pretend the panicking + // function calls sigpanic directly. + // Always save LR to stack so that panics in leaf + // functions are correctly handled. This smashes + // the stack frame but we're not going back there + // anyway. + sp := c.sp() - 4 + c.set_sp(sp) + *(*uint32)(unsafe.Pointer(uintptr(sp))) = c.lr() + + pc := gp.sigpc + + if shouldPushSigpanic(gp, pc, uintptr(c.lr())) { + // Make it look the like faulting PC called sigpanic. + c.set_lr(uint32(pc)) + } + + // In case we are panicking from external C code + c.set_r10(uint32(uintptr(unsafe.Pointer(gp)))) + c.set_pc(uint32(funcPC(sigpanic))) +} + +func (c *sigctxt) pushCall(targetPC, resumePC uintptr) { + // Push the LR to stack, as we'll clobber it in order to + // push the call. The function being pushed is responsible + // for restoring the LR and setting the SP back. + // This extra slot is known to gentraceback. + sp := c.sp() - 4 + c.set_sp(sp) + *(*uint32)(unsafe.Pointer(uintptr(sp))) = c.lr() + // Set up PC and LR to pretend the function being signaled + // calls targetPC at resumePC. + c.set_lr(uint32(resumePC)) + c.set_pc(uint32(targetPC)) +} -- cgit v1.2.3