Source file src/runtime/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) sigsp() uintptr { return uintptr(c.sp()) }
    57  func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    58  func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    59  
    60  // preparePanic sets up the stack to look like a call to sigpanic.
    61  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    62  	// We arrange link, and pc to pretend the panicking
    63  	// function calls sigpanic directly.
    64  	// Always save LINK to stack so that panics in leaf
    65  	// functions are correctly handled. This smashes
    66  	// the stack frame but we're not going back there
    67  	// anyway.
    68  	sp := c.sp() - goarch.PtrSize
    69  	c.set_sp(sp)
    70  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    71  
    72  	pc := gp.sigpc
    73  
    74  	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
    75  		// Make it look the like faulting PC called sigpanic.
    76  		c.set_link(uint64(pc))
    77  	}
    78  
    79  	// In case we are panicking from external C code
    80  	sigpanicPC := uint64(abi.FuncPCABIInternal(sigpanic))
    81  	c.set_r31(sigpanicPC >> 32 << 32) // RSB register
    82  	c.set_r22(uint64(uintptr(unsafe.Pointer(gp))))
    83  	c.set_pc(sigpanicPC)
    84  }
    85  
    86  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    87  	// Push the LR to stack, as we'll clobber it in order to
    88  	// push the call. The function being pushed is responsible
    89  	// for restoring the LR and setting the SP back.
    90  	// This extra slot is known to gentraceback.
    91  	sp := c.sp() - 8
    92  	c.set_sp(sp)
    93  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    94  	// Set up PC and LR to pretend the function being signaled
    95  	// calls targetPC at resumePC.
    96  	c.set_link(uint64(resumePC))
    97  	c.set_pc(uint64(targetPC))
    98  }
    99  

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