Source file src/pkg/runtime/signal_mips64x.go

     1	// Copyright 2015 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 linux
     6	// +build mips64 mips64le
     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("link ", hex(c.link()), "\n")
    50		print("lo   ", hex(c.lo()), "\t")
    51		print("hi   ", hex(c.hi()), "\n")
    52	}
    53	
    54	//go:nosplit
    55	//go:nowritebarrierrec
    56	func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    57	
    58	func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    59	func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    60	func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    61	
    62	// preparePanic sets up the stack to look like a call to sigpanic.
    63	func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    64		// We arrange link, and pc to pretend the panicking
    65		// function calls sigpanic directly.
    66		// Always save LINK to stack so that panics in leaf
    67		// functions are correctly handled. This smashes
    68		// the stack frame but we're not going back there
    69		// anyway.
    70		sp := c.sp() - sys.PtrSize
    71		c.set_sp(sp)
    72		*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    73	
    74		pc := gp.sigpc
    75	
    76		if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
    77			// Make it look the like faulting PC called sigpanic.
    78			c.set_link(uint64(pc))
    79		}
    80	
    81		// In case we are panicking from external C code
    82		sigpanicPC := uint64(funcPC(sigpanic))
    83		c.set_r28(sigpanicPC >> 32 << 32) // RSB register
    84		c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
    85		c.set_pc(sigpanicPC)
    86	}
    87	

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