signal_ppc64x.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 (aix || linux || openbsd) && (ppc64 || ppc64le)
     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()), "\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("ctr  ", hex(c.ctr()), "\n")
    50  	print("link ", hex(c.link()), "\t")
    51  	print("xer  ", hex(c.xer()), "\n")
    52  	print("ccr  ", hex(c.ccr()), "\t")
    53  	print("trap ", hex(c.trap()), "\n")
    54  }
    55  
    56  //go:nosplit
    57  //go:nowritebarrierrec
    58  func (c *sigctxt) sigpc() uintptr    { return uintptr(c.pc()) }
    59  func (c *sigctxt) setsigpc(x uint64) { c.set_pc(x) }
    60  
    61  func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    62  func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    63  
    64  // preparePanic sets up the stack to look like a call to sigpanic.
    65  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    66  	// We arrange link, and pc to pretend the panicking
    67  	// function calls sigpanic directly.
    68  	// Always save LINK to stack so that panics in leaf
    69  	// functions are correctly handled. This smashes
    70  	// the stack frame but we're not going back there
    71  	// anyway.
    72  	sp := c.sp() - sys.MinFrameSize
    73  	c.set_sp(sp)
    74  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    75  
    76  	pc := gp.sigpc
    77  
    78  	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
    79  		// Make it look the like faulting PC called sigpanic.
    80  		c.set_link(uint64(pc))
    81  	}
    82  
    83  	// In case we are panicking from external C code
    84  	c.set_r0(0)
    85  	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
    86  	c.set_r12(uint64(abi.FuncPCABIInternal(sigpanic)))
    87  	c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic)))
    88  }
    89  
    90  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    91  	// Push the LR to stack, as we'll clobber it in order to
    92  	// push the call. The function being pushed is responsible
    93  	// for restoring the LR and setting the SP back.
    94  	// This extra space is known to gentraceback.
    95  	sp := c.sp() - sys.MinFrameSize
    96  	c.set_sp(sp)
    97  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    98  	// In PIC mode, we'll set up (i.e. clobber) R2 on function
    99  	// entry. Save it ahead of time.
   100  	// In PIC mode it requires R12 points to the function entry,
   101  	// so we'll set it up when pushing the call. Save it ahead
   102  	// of time as well.
   103  	// 8(SP) and 16(SP) are unused space in the reserved
   104  	// MinFrameSize (32) bytes.
   105  	*(*uint64)(unsafe.Pointer(uintptr(sp) + 8)) = c.r2()
   106  	*(*uint64)(unsafe.Pointer(uintptr(sp) + 16)) = c.r12()
   107  	// Set up PC and LR to pretend the function being signaled
   108  	// calls targetPC at resumePC.
   109  	c.set_link(uint64(resumePC))
   110  	c.set_r12(uint64(targetPC))
   111  	c.set_pc(uint64(targetPC))
   112  }
   113
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