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Source file src/runtime/signal_mips64x.go

Documentation: runtime

     1  // Copyright 2015 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 mips64 mips64le
     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  //go:nosplit
    55  //go:nowritebarrierrec
    56  func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    57  
    58  func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    59  func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    60  func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    61  
    62  // preparePanic sets up the stack to look like a call to sigpanic.
    63  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    64  	// We arrange link, and pc to pretend the panicking
    65  	// function calls sigpanic directly.
    66  	// Always save LINK to stack so that panics in leaf
    67  	// functions are correctly handled. This smashes
    68  	// the stack frame but we're not going back there
    69  	// anyway.
    70  	sp := c.sp() - sys.PtrSize
    71  	c.set_sp(sp)
    72  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    73  
    74  	pc := gp.sigpc
    75  
    76  	// If we don't recognize the PC as code
    77  	// but we do recognize the link register as code,
    78  	// then assume this was a call to non-code and treat like
    79  	// pc == 0, to make unwinding show the context.
    80  	if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.link())).valid() {
    81  		pc = 0
    82  	}
    83  
    84  	// Don't bother saving PC if it's zero, which is
    85  	// probably a call to a nil func: the old link register
    86  	// is more useful in the stack trace.
    87  	if pc != 0 {
    88  		c.set_link(uint64(pc))
    89  	}
    90  
    91  	// In case we are panicking from external C code
    92  	sigpanicPC := uint64(funcPC(sigpanic))
    93  	c.set_r28(sigpanicPC >> 32 << 32) // RSB register
    94  	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
    95  	c.set_pc(sigpanicPC)
    96  }
    97  

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