signal_riscv64.go

     1  // Copyright 2016 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 (linux || freebsd || openbsd) && riscv64
     6  
     7  package runtime
     8  
     9  import (
    10  	"internal/abi"
    11  	"internal/goarch"
    12  	"unsafe"
    13  )
    14  
    15  func dumpregs(c *sigctxt) {
    16  	print("ra  ", hex(c.ra()), "\t")
    17  	print("sp  ", hex(c.sp()), "\n")
    18  	print("gp  ", hex(c.gp()), "\t")
    19  	print("tp  ", hex(c.tp()), "\n")
    20  	print("t0  ", hex(c.t0()), "\t")
    21  	print("t1  ", hex(c.t1()), "\n")
    22  	print("t2  ", hex(c.t2()), "\t")
    23  	print("s0  ", hex(c.s0()), "\n")
    24  	print("s1  ", hex(c.s1()), "\t")
    25  	print("a0  ", hex(c.a0()), "\n")
    26  	print("a1  ", hex(c.a1()), "\t")
    27  	print("a2  ", hex(c.a2()), "\n")
    28  	print("a3  ", hex(c.a3()), "\t")
    29  	print("a4  ", hex(c.a4()), "\n")
    30  	print("a5  ", hex(c.a5()), "\t")
    31  	print("a6  ", hex(c.a6()), "\n")
    32  	print("a7  ", hex(c.a7()), "\t")
    33  	print("s2  ", hex(c.s2()), "\n")
    34  	print("s3  ", hex(c.s3()), "\t")
    35  	print("s4  ", hex(c.s4()), "\n")
    36  	print("s5  ", hex(c.s5()), "\t")
    37  	print("s6  ", hex(c.s6()), "\n")
    38  	print("s7  ", hex(c.s7()), "\t")
    39  	print("s8  ", hex(c.s8()), "\n")
    40  	print("s9  ", hex(c.s9()), "\t")
    41  	print("s10 ", hex(c.s10()), "\n")
    42  	print("s11 ", hex(c.s11()), "\t")
    43  	print("t3  ", hex(c.t3()), "\n")
    44  	print("t4  ", hex(c.t4()), "\t")
    45  	print("t5  ", hex(c.t5()), "\n")
    46  	print("t6  ", hex(c.t6()), "\t")
    47  	print("pc  ", hex(c.pc()), "\n")
    48  }
    49  
    50  //go:nosplit
    51  //go:nowritebarrierrec
    52  func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    53  
    54  func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    55  func (c *sigctxt) siglr() uintptr { return uintptr(c.ra()) }
    56  func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    57  
    58  // preparePanic sets up the stack to look like a call to sigpanic.
    59  func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    60  	// We arrange RA, and pc to pretend the panicking
    61  	// function calls sigpanic directly.
    62  	// Always save RA to stack so that panics in leaf
    63  	// functions are correctly handled. This smashes
    64  	// the stack frame but we're not going back there
    65  	// anyway.
    66  	sp := c.sp() - goarch.PtrSize
    67  	c.set_sp(sp)
    68  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra()
    69  
    70  	pc := gp.sigpc
    71  
    72  	if shouldPushSigpanic(gp, pc, uintptr(c.ra())) {
    73  		// Make it look the like faulting PC called sigpanic.
    74  		c.set_ra(uint64(pc))
    75  	}
    76  
    77  	// In case we are panicking from external C code
    78  	c.set_gp(uint64(uintptr(unsafe.Pointer(gp))))
    79  	c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic)))
    80  }
    81  
    82  func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
    83  	// Push the LR to stack, as we'll clobber it in order to
    84  	// push the call. The function being pushed is responsible
    85  	// for restoring the LR and setting the SP back.
    86  	// This extra slot is known to gentraceback.
    87  	sp := c.sp() - goarch.PtrSize
    88  	c.set_sp(sp)
    89  	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra()
    90  	// Set up PC and LR to pretend the function being signaled
    91  	// calls targetPC at resumePC.
    92  	c.set_ra(uint64(resumePC))
    93  	c.set_pc(uint64(targetPC))
    94  }
    95
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