Source file src/runtime/signal_linux_s390x.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	package runtime
     6	
     7	import (
     8		"runtime/internal/sys"
     9		"unsafe"
    10	)
    11	
    12	type sigctxt struct {
    13		info *siginfo
    14		ctxt unsafe.Pointer
    15	}
    16	
    17	//go:nosplit
    18	//go:nowritebarrierrec
    19	func (c *sigctxt) regs() *sigcontext {
    20		return (*sigcontext)(unsafe.Pointer(&(*ucontext)(c.ctxt).uc_mcontext))
    21	}
    22	
    23	func (c *sigctxt) r0() uint64   { return c.regs().gregs[0] }
    24	func (c *sigctxt) r1() uint64   { return c.regs().gregs[1] }
    25	func (c *sigctxt) r2() uint64   { return c.regs().gregs[2] }
    26	func (c *sigctxt) r3() uint64   { return c.regs().gregs[3] }
    27	func (c *sigctxt) r4() uint64   { return c.regs().gregs[4] }
    28	func (c *sigctxt) r5() uint64   { return c.regs().gregs[5] }
    29	func (c *sigctxt) r6() uint64   { return c.regs().gregs[6] }
    30	func (c *sigctxt) r7() uint64   { return c.regs().gregs[7] }
    31	func (c *sigctxt) r8() uint64   { return c.regs().gregs[8] }
    32	func (c *sigctxt) r9() uint64   { return c.regs().gregs[9] }
    33	func (c *sigctxt) r10() uint64  { return c.regs().gregs[10] }
    34	func (c *sigctxt) r11() uint64  { return c.regs().gregs[11] }
    35	func (c *sigctxt) r12() uint64  { return c.regs().gregs[12] }
    36	func (c *sigctxt) r13() uint64  { return c.regs().gregs[13] }
    37	func (c *sigctxt) r14() uint64  { return c.regs().gregs[14] }
    38	func (c *sigctxt) r15() uint64  { return c.regs().gregs[15] }
    39	func (c *sigctxt) link() uint64 { return c.regs().gregs[14] }
    40	func (c *sigctxt) sp() uint64   { return c.regs().gregs[15] }
    41	
    42	//go:nosplit
    43	//go:nowritebarrierrec
    44	func (c *sigctxt) pc() uint64 { return c.regs().psw_addr }
    45	
    46	func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
    47	func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
    48	
    49	func (c *sigctxt) set_r0(x uint64)      { c.regs().gregs[0] = x }
    50	func (c *sigctxt) set_r13(x uint64)     { c.regs().gregs[13] = x }
    51	func (c *sigctxt) set_link(x uint64)    { c.regs().gregs[14] = x }
    52	func (c *sigctxt) set_sp(x uint64)      { c.regs().gregs[15] = x }
    53	func (c *sigctxt) set_pc(x uint64)      { c.regs().psw_addr = x }
    54	func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
    55	func (c *sigctxt) set_sigaddr(x uint64) {
    56		*(*uintptr)(add(unsafe.Pointer(c.info), 2*sys.PtrSize)) = uintptr(x)
    57	}
    58	
    59	func dumpregs(c *sigctxt) {
    60		print("r0   ", hex(c.r0()), "\t")
    61		print("r1   ", hex(c.r1()), "\n")
    62		print("r2   ", hex(c.r2()), "\t")
    63		print("r3   ", hex(c.r3()), "\n")
    64		print("r4   ", hex(c.r4()), "\t")
    65		print("r5   ", hex(c.r5()), "\n")
    66		print("r6   ", hex(c.r6()), "\t")
    67		print("r7   ", hex(c.r7()), "\n")
    68		print("r8   ", hex(c.r8()), "\t")
    69		print("r9   ", hex(c.r9()), "\n")
    70		print("r10  ", hex(c.r10()), "\t")
    71		print("r11  ", hex(c.r11()), "\n")
    72		print("r12  ", hex(c.r12()), "\t")
    73		print("r13  ", hex(c.r13()), "\n")
    74		print("r14  ", hex(c.r14()), "\t")
    75		print("r15  ", hex(c.r15()), "\n")
    76		print("pc   ", hex(c.pc()), "\t")
    77		print("link ", hex(c.link()), "\n")
    78	}
    79	
    80	//go:nosplit
    81	//go:nowritebarrierrec
    82	func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
    83	
    84	func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
    85	func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
    86	func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
    87	
    88	// preparePanic sets up the stack to look like a call to sigpanic.
    89	func (c *sigctxt) preparePanic(sig uint32, gp *g) {
    90		// We arrange link, and pc to pretend the panicking
    91		// function calls sigpanic directly.
    92		// Always save LINK to stack so that panics in leaf
    93		// functions are correctly handled. This smashes
    94		// the stack frame but we're not going back there
    95		// anyway.
    96		sp := c.sp() - sys.MinFrameSize
    97		c.set_sp(sp)
    98		*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
    99	
   100		pc := uintptr(gp.sigpc)
   101	
   102		if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
   103			// Make it look the like faulting PC called sigpanic.
   104			c.set_link(uint64(pc))
   105		}
   106	
   107		// In case we are panicking from external C code
   108		c.set_r0(0)
   109		c.set_r13(uint64(uintptr(unsafe.Pointer(gp))))
   110		c.set_pc(uint64(funcPC(sigpanic)))
   111	}
   112	

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