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Source file src/runtime/signal_mipsx.go

Documentation: runtime

     1  // Copyright 2016 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 linux
     6  // +build mips mipsle
     7  
     8  package runtime
     9  
    10  import (
    11  	"runtime/internal/sys"
    12  	"unsafe"
    13  )
    14  
    15  func dumpregs(c *sigctxt) {
    16  	print("r0   ", hex(c.r0()), "\t")
    17  	print("r1   ", hex(c.r1()), "\n")
    18  	print("r2   ", hex(c.r2()), "\t")
    19  	print("r3   ", hex(c.r3()), "\n")
    20  	print("r4   ", hex(c.r4()), "\t")
    21  	print("r5   ", hex(c.r5()), "\n")
    22  	print("r6   ", hex(c.r6()), "\t")
    23  	print("r7   ", hex(c.r7()), "\n")
    24  	print("r8   ", hex(c.r8()), "\t")
    25  	print("r9   ", hex(c.r9()), "\n")
    26  	print("r10  ", hex(c.r10()), "\t")
    27  	print("r11  ", hex(c.r11()), "\n")
    28  	print("r12  ", hex(c.r12()), "\t")
    29  	print("r13  ", hex(c.r13()), "\n")
    30  	print("r14  ", hex(c.r14()), "\t")
    31  	print("r15  ", hex(c.r15()), "\n")
    32  	print("r16  ", hex(c.r16()), "\t")
    33  	print("r17  ", hex(c.r17()), "\n")
    34  	print("r18  ", hex(c.r18()), "\t")
    35  	print("r19  ", hex(c.r19()), "\n")
    36  	print("r20  ", hex(c.r20()), "\t")
    37  	print("r21  ", hex(c.r21()), "\n")
    38  	print("r22  ", hex(c.r22()), "\t")
    39  	print("r23  ", hex(c.r23()), "\n")
    40  	print("r24  ", hex(c.r24()), "\t")
    41  	print("r25  ", hex(c.r25()), "\n")
    42  	print("r26  ", hex(c.r26()), "\t")
    43  	print("r27  ", hex(c.r27()), "\n")
    44  	print("r28  ", hex(c.r28()), "\t")
    45  	print("r29  ", hex(c.r29()), "\n")
    46  	print("r30  ", hex(c.r30()), "\t")
    47  	print("r31  ", hex(c.r31()), "\n")
    48  	print("pc   ", hex(c.pc()), "\t")
    49  	print("link ", hex(c.link()), "\n")
    50  	print("lo   ", hex(c.lo()), "\t")
    51  	print("hi   ", hex(c.hi()), "\n")
    52  }
    53  
    54  func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    55  func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    56  func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    57  func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    58  
    59  // preparePanic sets up the stack to look like a call to sigpanic.
    60  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    61  	// We arrange link, and pc to pretend the panicking
    62  	// function calls sigpanic directly.
    63  	// Always save LINK to stack so that panics in leaf
    64  	// functions are correctly handled. This smashes
    65  	// the stack frame but we're not going back there
    66  	// anyway.
    67  	sp := c.sp() - sys.MinFrameSize
    68  	c.set_sp(sp)
    69  	*(*uint32)(unsafe.Pointer(uintptr(sp))) = c.link()
    70  
    71  	pc := gp.sigpc
    72  
    73  	// If we don't recognize the PC as code
    74  	// but we do recognize the link register as code,
    75  	// then assume this was a call to non-code and treat like
    76  	// pc == 0, to make unwinding show the context.
    77  	if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.link())).valid() {
    78  		pc = 0
    79  	}
    80  
    81  	// Don't bother saving PC if it's zero, which is
    82  	// probably a call to a nil func: the old link register
    83  	// is more useful in the stack trace.
    84  	if pc != 0 {
    85  		c.set_link(uint32(pc))
    86  	}
    87  
    88  	// In case we are panicking from external C code
    89  	c.set_r30(uint32(uintptr(unsafe.Pointer(gp))))
    90  	c.set_pc(uint32(funcPC(sigpanic)))
    91  }
    92  

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