signal_mips64x.go

     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  //go:build (linux || openbsd) && (mips64 || mips64le)
     6  
     7  package runtime
     8  
     9  import (
    10  	"internal/abi"
    11  	"internal/goarch"
    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() - goarch.PtrSize
    71  	c.set_sp(sp)
    72  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    73  
    74  	pc := gp.sigpc
    75  
    76  	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
    77  		// Make it look the like faulting PC called sigpanic.
    78  		c.set_link(uint64(pc))
    79  	}
    80  
    81  	// In case we are panicking from external C code
    82  	sigpanicPC := uint64(abi.FuncPCABIInternal(sigpanic))
    83  	c.set_r28(sigpanicPC >> 32 << 32) // RSB register
    84  	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
    85  	c.set_pc(sigpanicPC)
    86  }
    87  
    88  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    89  	// Push the LR to stack, as we'll clobber it in order to
    90  	// push the call. The function being pushed is responsible
    91  	// for restoring the LR and setting the SP back.
    92  	// This extra slot is known to gentraceback.
    93  	sp := c.sp() - 8
    94  	c.set_sp(sp)
    95  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    96  	// Set up PC and LR to pretend the function being signaled
    97  	// calls targetPC at resumePC.
    98  	c.set_link(uint64(resumePC))
    99  	c.set_pc(uint64(targetPC))
   100  }
   101
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