signal_loong64.go

     1  // Copyright 2022 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 && loong64
     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  }
    51  
    52  //go:nosplit
    53  //go:nowritebarrierrec
    54  func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    55  
    56  func (c *sigctxt) setsigpc(x uint64) { c.set_pc(x) }
    57  func (c *sigctxt) sigsp() uintptr    { return uintptr(c.sp()) }
    58  func (c *sigctxt) siglr() uintptr    { return uintptr(c.link()) }
    59  func (c *sigctxt) fault() uintptr    { return uintptr(c.sigaddr()) }
    60  
    61  // preparePanic sets up the stack to look like a call to sigpanic.
    62  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    63  	// We arrange link, and pc to pretend the panicking
    64  	// function calls sigpanic directly.
    65  	// Always save LINK to stack so that panics in leaf
    66  	// functions are correctly handled. This smashes
    67  	// the stack frame but we're not going back there
    68  	// anyway.
    69  	sp := c.sp() - goarch.PtrSize
    70  	c.set_sp(sp)
    71  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    72  
    73  	pc := gp.sigpc
    74  
    75  	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
    76  		// Make it look the like faulting PC called sigpanic.
    77  		c.set_link(uint64(pc))
    78  	}
    79  
    80  	// In case we are panicking from external C code
    81  	c.set_r22(uint64(uintptr(unsafe.Pointer(gp))))
    82  	c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic)))
    83  }
    84  
    85  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    86  	// Push the LR to stack, as we'll clobber it in order to
    87  	// push the call. The function being pushed is responsible
    88  	// for restoring the LR and setting the SP back.
    89  	// This extra slot is known to gentraceback.
    90  	sp := c.sp() - 8
    91  	c.set_sp(sp)
    92  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    93  	// Set up PC and LR to pretend the function being signaled
    94  	// calls targetPC at resumePC.
    95  	c.set_link(uint64(resumePC))
    96  	c.set_pc(uint64(targetPC))
    97  }
    98
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