github.com/c9s/go@v0.0.0-20180120015821-984e81f64e0c/src/runtime/signal_arm.go (about)

     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 we don't recognize the PC as code
    57  	// but we do recognize the link register as code,
    58  	// then assume this was a call to non-code and treat like
    59  	// pc == 0, to make unwinding show the context.
    60  	if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.lr())).valid() {
    61  		pc = 0
    62  	}
    63  
    64  	// Don't bother saving PC if it's zero, which is
    65  	// probably a call to a nil func: the old link register
    66  	// is more useful in the stack trace.
    67  	if pc != 0 {
    68  		c.set_lr(uint32(pc))
    69  	}
    70  
    71  	// In case we are panicking from external C code
    72  	c.set_r10(uint32(uintptr(unsafe.Pointer(gp))))
    73  	c.set_pc(uint32(funcPC(sigpanic)))
    74  }