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-rw-r--r--src/runtime/signal_arm.go81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/runtime/signal_arm.go b/src/runtime/signal_arm.go
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--- /dev/null
+++ b/src/runtime/signal_arm.go
@@ -0,0 +1,81 @@
+// 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.
+
+//go:build dragonfly || freebsd || linux || netbsd || openbsd
+
+package runtime
+
+import (
+ "internal/abi"
+ "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(abi.FuncPCABIInternal(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))
+}