diff options
Diffstat (limited to 'src/runtime/signal_riscv64.go')
-rw-r--r-- | src/runtime/signal_riscv64.go | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/runtime/signal_riscv64.go b/src/runtime/signal_riscv64.go new file mode 100644 index 0000000..b8d7b97 --- /dev/null +++ b/src/runtime/signal_riscv64.go @@ -0,0 +1,94 @@ +// 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. + +//go:build (linux || freebsd) && riscv64 + +package runtime + +import ( + "internal/abi" + "internal/goarch" + "unsafe" +) + +func dumpregs(c *sigctxt) { + print("ra ", hex(c.ra()), "\t") + print("sp ", hex(c.sp()), "\n") + print("gp ", hex(c.gp()), "\t") + print("tp ", hex(c.tp()), "\n") + print("t0 ", hex(c.t0()), "\t") + print("t1 ", hex(c.t1()), "\n") + print("t2 ", hex(c.t2()), "\t") + print("s0 ", hex(c.s0()), "\n") + print("s1 ", hex(c.s1()), "\t") + print("a0 ", hex(c.a0()), "\n") + print("a1 ", hex(c.a1()), "\t") + print("a2 ", hex(c.a2()), "\n") + print("a3 ", hex(c.a3()), "\t") + print("a4 ", hex(c.a4()), "\n") + print("a5 ", hex(c.a5()), "\t") + print("a6 ", hex(c.a6()), "\n") + print("a7 ", hex(c.a7()), "\t") + print("s2 ", hex(c.s2()), "\n") + print("s3 ", hex(c.s3()), "\t") + print("s4 ", hex(c.s4()), "\n") + print("s5 ", hex(c.s5()), "\t") + print("s6 ", hex(c.s6()), "\n") + print("s7 ", hex(c.s7()), "\t") + print("s8 ", hex(c.s8()), "\n") + print("s9 ", hex(c.s9()), "\t") + print("s10 ", hex(c.s10()), "\n") + print("s11 ", hex(c.s11()), "\t") + print("t3 ", hex(c.t3()), "\n") + print("t4 ", hex(c.t4()), "\t") + print("t5 ", hex(c.t5()), "\n") + print("t6 ", hex(c.t6()), "\t") + print("pc ", hex(c.pc()), "\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.ra()) } +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 RA, and pc to pretend the panicking + // function calls sigpanic directly. + // Always save RA 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() - goarch.PtrSize + c.set_sp(sp) + *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra() + + pc := gp.sigpc + + if shouldPushSigpanic(gp, pc, uintptr(c.ra())) { + // Make it look the like faulting PC called sigpanic. + c.set_ra(uint64(pc)) + } + + // In case we are panicking from external C code + c.set_gp(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() - goarch.PtrSize + c.set_sp(sp) + *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra() + // Set up PC and LR to pretend the function being signaled + // calls targetPC at resumePC. + c.set_ra(uint64(resumePC)) + c.set_pc(uint64(targetPC)) +} |