signal_arm64.go

     1  // Copyright 2014 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 darwin || freebsd || linux || netbsd || openbsd
     6  
     7  package runtime
     8  
     9  import (
    10  	"internal/abi"
    11  	"runtime/internal/sys"
    12  	"unsafe"
    13  )
    14  
    15  func dumpregs(c *sigctxt) {
    16  	print("r0      ", hex(c.r0()), "\n")
    17  	print("r1      ", hex(c.r1()), "\n")
    18  	print("r2      ", hex(c.r2()), "\n")
    19  	print("r3      ", hex(c.r3()), "\n")
    20  	print("r4      ", hex(c.r4()), "\n")
    21  	print("r5      ", hex(c.r5()), "\n")
    22  	print("r6      ", hex(c.r6()), "\n")
    23  	print("r7      ", hex(c.r7()), "\n")
    24  	print("r8      ", hex(c.r8()), "\n")
    25  	print("r9      ", hex(c.r9()), "\n")
    26  	print("r10     ", hex(c.r10()), "\n")
    27  	print("r11     ", hex(c.r11()), "\n")
    28  	print("r12     ", hex(c.r12()), "\n")
    29  	print("r13     ", hex(c.r13()), "\n")
    30  	print("r14     ", hex(c.r14()), "\n")
    31  	print("r15     ", hex(c.r15()), "\n")
    32  	print("r16     ", hex(c.r16()), "\n")
    33  	print("r17     ", hex(c.r17()), "\n")
    34  	print("r18     ", hex(c.r18()), "\n")
    35  	print("r19     ", hex(c.r19()), "\n")
    36  	print("r20     ", hex(c.r20()), "\n")
    37  	print("r21     ", hex(c.r21()), "\n")
    38  	print("r22     ", hex(c.r22()), "\n")
    39  	print("r23     ", hex(c.r23()), "\n")
    40  	print("r24     ", hex(c.r24()), "\n")
    41  	print("r25     ", hex(c.r25()), "\n")
    42  	print("r26     ", hex(c.r26()), "\n")
    43  	print("r27     ", hex(c.r27()), "\n")
    44  	print("r28     ", hex(c.r28()), "\n")
    45  	print("r29     ", hex(c.r29()), "\n")
    46  	print("lr      ", hex(c.lr()), "\n")
    47  	print("sp      ", hex(c.sp()), "\n")
    48  	print("pc      ", hex(c.pc()), "\n")
    49  	print("fault   ", hex(c.fault()), "\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.lr()) }
    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 lr, and pc to pretend the panicking
    63  	// function calls sigpanic directly.
    64  	// Always save LR 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() - sys.StackAlign // needs only sizeof uint64, but must align the stack
    69  	c.set_sp(sp)
    70  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
    71  
    72  	pc := gp.sigpc
    73  
    74  	if shouldPushSigpanic(gp, pc, uintptr(c.lr())) {
    75  		// Make it look the like faulting PC called sigpanic.
    76  		c.set_lr(uint64(pc))
    77  	}
    78  
    79  	// In case we are panicking from external C code
    80  	c.set_r28(uint64(uintptr(unsafe.Pointer(gp))))
    81  	c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic)))
    82  }
    83  
    84  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    85  	// Push the LR to stack, as we'll clobber it in order to
    86  	// push the call. The function being pushed is responsible
    87  	// for restoring the LR and setting the SP back.
    88  	// This extra space is known to gentraceback.
    89  	sp := c.sp() - 16 // SP needs 16-byte alignment
    90  	c.set_sp(sp)
    91  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
    92  	// Set up PC and LR to pretend the function being signaled
    93  	// calls targetPC at resumePC.
    94  	c.set_lr(uint64(resumePC))
    95  	c.set_pc(uint64(targetPC))
    96  }
    97
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