Source file src/runtime/signal_arm.go

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd linux nacl netbsd openbsd
     6	
     7	package runtime
     8	
     9	import "unsafe"
    10	
    11	func dumpregs(c *sigctxt) {
    12		print("trap    ", hex(c.trap()), "\n")
    13		print("error   ", hex(c.error()), "\n")
    14		print("oldmask ", hex(c.oldmask()), "\n")
    15		print("r0      ", hex(c.r0()), "\n")
    16		print("r1      ", hex(c.r1()), "\n")
    17		print("r2      ", hex(c.r2()), "\n")
    18		print("r3      ", hex(c.r3()), "\n")
    19		print("r4      ", hex(c.r4()), "\n")
    20		print("r5      ", hex(c.r5()), "\n")
    21		print("r6      ", hex(c.r6()), "\n")
    22		print("r7      ", hex(c.r7()), "\n")
    23		print("r8      ", hex(c.r8()), "\n")
    24		print("r9      ", hex(c.r9()), "\n")
    25		print("r10     ", hex(c.r10()), "\n")
    26		print("fp      ", hex(c.fp()), "\n")
    27		print("ip      ", hex(c.ip()), "\n")
    28		print("sp      ", hex(c.sp()), "\n")
    29		print("lr      ", hex(c.lr()), "\n")
    30		print("pc      ", hex(c.pc()), "\n")
    31		print("cpsr    ", hex(c.cpsr()), "\n")
    32		print("fault   ", hex(c.fault()), "\n")
    33	}
    34	
    35	//go:nosplit
    36	//go:nowritebarrierrec
    37	func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    38	
    39	func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    40	func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) }
    41	
    42	// preparePanic sets up the stack to look like a call to sigpanic.
    43	func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    44		// We arrange lr, and pc to pretend the panicking
    45		// function calls sigpanic directly.
    46		// Always save LR to stack so that panics in leaf
    47		// functions are correctly handled. This smashes
    48		// the stack frame but we're not going back there
    49		// anyway.
    50		sp := c.sp() - 4
    51		c.set_sp(sp)
    52		*(*uint32)(unsafe.Pointer(uintptr(sp))) = c.lr()
    53	
    54		pc := gp.sigpc
    55	
    56		if shouldPushSigpanic(gp, pc, uintptr(c.lr())) {
    57			// Make it look the like faulting PC called sigpanic.
    58			c.set_lr(uint32(pc))
    59		}
    60	
    61		// In case we are panicking from external C code
    62		c.set_r10(uint32(uintptr(unsafe.Pointer(gp))))
    63		c.set_pc(uint32(funcPC(sigpanic)))
    64	}
    65	

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