signal_arm64.go

Documentation: runtime

     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  // +build darwin freebsd linux netbsd openbsd
     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()), "\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) sigsp() uintptr { return uintptr(c.sp()) }
    57  func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) }
    58  
    59  // preparePanic sets up the stack to look like a call to sigpanic.
    60  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    61  	// We arrange lr, and pc to pretend the panicking
    62  	// function calls sigpanic directly.
    63  	// Always save LR to stack so that panics in leaf
    64  	// functions are correctly handled. This smashes
    65  	// the stack frame but we're not going back there
    66  	// anyway.
    67  	sp := c.sp() - sys.StackAlign // needs only sizeof uint64, but must align the stack
    68  	c.set_sp(sp)
    69  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
    70  
    71  	pc := gp.sigpc
    72  
    73  	if shouldPushSigpanic(gp, pc, uintptr(c.lr())) {
    74  		// Make it look the like faulting PC called sigpanic.
    75  		c.set_lr(uint64(pc))
    76  	}
    77  
    78  	// In case we are panicking from external C code
    79  	c.set_r28(uint64(uintptr(unsafe.Pointer(gp))))
    80  	c.set_pc(uint64(funcPC(sigpanic)))
    81  }
    82  
    83  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    84  	// Push the LR to stack, as we'll clobber it in order to
    85  	// push the call. The function being pushed is responsible
    86  	// for restoring the LR and setting the SP back.
    87  	// This extra space is known to gentraceback.
    88  	sp := c.sp() - 16 // SP needs 16-byte alignment
    89  	c.set_sp(sp)
    90  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
    91  	// Set up PC and LR to pretend the function being signaled
    92  	// calls targetPC at resumePC.
    93  	c.set_lr(uint64(resumePC))
    94  	c.set_pc(uint64(targetPC))
    95  }
    96
View as plain text