github.com/geraldss/go/src@v0.0.0-20210511222824-ac7d0ebfc235/runtime/signal_ppc64x.go (about)

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