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Diffstat (limited to '')
| -rw-r--r-- | src/runtime/signal_linux_s390x.go | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/runtime/signal_linux_s390x.go b/src/runtime/signal_linux_s390x.go new file mode 100644 index 0000000..18c3b11 --- /dev/null +++ b/src/runtime/signal_linux_s390x.go @@ -0,0 +1,127 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package runtime + +import ( + "internal/abi" + "internal/goarch" + "runtime/internal/sys" + "unsafe" +) + +type sigctxt struct { + info *siginfo + ctxt unsafe.Pointer +} + +//go:nosplit +//go:nowritebarrierrec +func (c *sigctxt) regs() *sigcontext { + return (*sigcontext)(unsafe.Pointer(&(*ucontext)(c.ctxt).uc_mcontext)) +} + +func (c *sigctxt) r0() uint64 { return c.regs().gregs[0] } +func (c *sigctxt) r1() uint64 { return c.regs().gregs[1] } +func (c *sigctxt) r2() uint64 { return c.regs().gregs[2] } +func (c *sigctxt) r3() uint64 { return c.regs().gregs[3] } +func (c *sigctxt) r4() uint64 { return c.regs().gregs[4] } +func (c *sigctxt) r5() uint64 { return c.regs().gregs[5] } +func (c *sigctxt) r6() uint64 { return c.regs().gregs[6] } +func (c *sigctxt) r7() uint64 { return c.regs().gregs[7] } +func (c *sigctxt) r8() uint64 { return c.regs().gregs[8] } +func (c *sigctxt) r9() uint64 { return c.regs().gregs[9] } +func (c *sigctxt) r10() uint64 { return c.regs().gregs[10] } +func (c *sigctxt) r11() uint64 { return c.regs().gregs[11] } +func (c *sigctxt) r12() uint64 { return c.regs().gregs[12] } +func (c *sigctxt) r13() uint64 { return c.regs().gregs[13] } +func (c *sigctxt) r14() uint64 { return c.regs().gregs[14] } +func (c *sigctxt) r15() uint64 { return c.regs().gregs[15] } +func (c *sigctxt) link() uint64 { return c.regs().gregs[14] } +func (c *sigctxt) sp() uint64 { return c.regs().gregs[15] } + +//go:nosplit +//go:nowritebarrierrec +func (c *sigctxt) pc() uint64 { return c.regs().psw_addr } + +func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) } +func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr } + +func (c *sigctxt) set_r0(x uint64) { c.regs().gregs[0] = x } +func (c *sigctxt) set_r13(x uint64) { c.regs().gregs[13] = x } +func (c *sigctxt) set_link(x uint64) { c.regs().gregs[14] = x } +func (c *sigctxt) set_sp(x uint64) { c.regs().gregs[15] = x } +func (c *sigctxt) set_pc(x uint64) { c.regs().psw_addr = x } +func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) } +func (c *sigctxt) set_sigaddr(x uint64) { + *(*uintptr)(add(unsafe.Pointer(c.info), 2*goarch.PtrSize)) = uintptr(x) +} + +func dumpregs(c *sigctxt) { + print("r0 ", hex(c.r0()), "\t") + print("r1 ", hex(c.r1()), "\n") + print("r2 ", hex(c.r2()), "\t") + print("r3 ", hex(c.r3()), "\n") + print("r4 ", hex(c.r4()), "\t") + print("r5 ", hex(c.r5()), "\n") + print("r6 ", hex(c.r6()), "\t") + print("r7 ", hex(c.r7()), "\n") + print("r8 ", hex(c.r8()), "\t") + print("r9 ", hex(c.r9()), "\n") + print("r10 ", hex(c.r10()), "\t") + print("r11 ", hex(c.r11()), "\n") + print("r12 ", hex(c.r12()), "\t") + print("r13 ", hex(c.r13()), "\n") + print("r14 ", hex(c.r14()), "\t") + print("r15 ", hex(c.r15()), "\n") + print("pc ", hex(c.pc()), "\t") + print("link ", hex(c.link()), "\n") +} + +//go:nosplit +//go:nowritebarrierrec +func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } + +func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } +func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) } +func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) } + +// preparePanic sets up the stack to look like a call to sigpanic. +func (c *sigctxt) preparePanic(sig uint32, gp *g) { + // We arrange link, and pc to pretend the panicking + // function calls sigpanic directly. + // Always save LINK to stack so that panics in leaf + // functions are correctly handled. This smashes + // the stack frame but we're not going back there + // anyway. + sp := c.sp() - sys.MinFrameSize + c.set_sp(sp) + *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link() + + pc := uintptr(gp.sigpc) + + if shouldPushSigpanic(gp, pc, uintptr(c.link())) { + // Make it look the like faulting PC called sigpanic. + c.set_link(uint64(pc)) + } + + // In case we are panicking from external C code + c.set_r0(0) + c.set_r13(uint64(uintptr(unsafe.Pointer(gp)))) + c.set_pc(uint64(abi.FuncPCABIInternal(sigpanic))) +} + +func (c *sigctxt) pushCall(targetPC, resumePC uintptr) { + // Push the LR to stack, as we'll clobber it in order to + // push the call. The function being pushed is responsible + // for restoring the LR and setting the SP back. + // This extra slot is known to gentraceback. + sp := c.sp() - 8 + c.set_sp(sp) + *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link() + // Set up PC and LR to pretend the function being signaled + // calls targetPC at resumePC. + c.set_link(uint64(resumePC)) + c.set_pc(uint64(targetPC)) +} |