github.com/gidoBOSSftw5731/go/src@v0.0.0-20210226122457-d24b0edbf019/runtime/signal_mips64x.go (about) 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 //go:build (linux || openbsd) && (mips64 || mips64le) 6 // +build linux openbsd 7 // +build mips64 mips64le 8 9 package runtime 10 11 import ( 12 "runtime/internal/sys" 13 "unsafe" 14 ) 15 16 func dumpregs(c *sigctxt) { 17 print("r0 ", hex(c.r0()), "\t") 18 print("r1 ", hex(c.r1()), "\n") 19 print("r2 ", hex(c.r2()), "\t") 20 print("r3 ", hex(c.r3()), "\n") 21 print("r4 ", hex(c.r4()), "\t") 22 print("r5 ", hex(c.r5()), "\n") 23 print("r6 ", hex(c.r6()), "\t") 24 print("r7 ", hex(c.r7()), "\n") 25 print("r8 ", hex(c.r8()), "\t") 26 print("r9 ", hex(c.r9()), "\n") 27 print("r10 ", hex(c.r10()), "\t") 28 print("r11 ", hex(c.r11()), "\n") 29 print("r12 ", hex(c.r12()), "\t") 30 print("r13 ", hex(c.r13()), "\n") 31 print("r14 ", hex(c.r14()), "\t") 32 print("r15 ", hex(c.r15()), "\n") 33 print("r16 ", hex(c.r16()), "\t") 34 print("r17 ", hex(c.r17()), "\n") 35 print("r18 ", hex(c.r18()), "\t") 36 print("r19 ", hex(c.r19()), "\n") 37 print("r20 ", hex(c.r20()), "\t") 38 print("r21 ", hex(c.r21()), "\n") 39 print("r22 ", hex(c.r22()), "\t") 40 print("r23 ", hex(c.r23()), "\n") 41 print("r24 ", hex(c.r24()), "\t") 42 print("r25 ", hex(c.r25()), "\n") 43 print("r26 ", hex(c.r26()), "\t") 44 print("r27 ", hex(c.r27()), "\n") 45 print("r28 ", hex(c.r28()), "\t") 46 print("r29 ", hex(c.r29()), "\n") 47 print("r30 ", hex(c.r30()), "\t") 48 print("r31 ", hex(c.r31()), "\n") 49 print("pc ", hex(c.pc()), "\t") 50 print("link ", hex(c.link()), "\n") 51 print("lo ", hex(c.lo()), "\t") 52 print("hi ", hex(c.hi()), "\n") 53 } 54 55 //go:nosplit 56 //go:nowritebarrierrec 57 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } 58 59 func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } 60 func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) } 61 func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) } 62 63 // preparePanic sets up the stack to look like a call to sigpanic. 64 func (c *sigctxt) preparePanic(sig uint32, gp *g) { 65 // We arrange link, and pc to pretend the panicking 66 // function calls sigpanic directly. 67 // Always save LINK to stack so that panics in leaf 68 // functions are correctly handled. This smashes 69 // the stack frame but we're not going back there 70 // anyway. 71 sp := c.sp() - sys.PtrSize 72 c.set_sp(sp) 73 *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link() 74 75 pc := gp.sigpc 76 77 if shouldPushSigpanic(gp, pc, uintptr(c.link())) { 78 // Make it look the like faulting PC called sigpanic. 79 c.set_link(uint64(pc)) 80 } 81 82 // In case we are panicking from external C code 83 sigpanicPC := uint64(funcPC(sigpanic)) 84 c.set_r28(sigpanicPC >> 32 << 32) // RSB register 85 c.set_r30(uint64(uintptr(unsafe.Pointer(gp)))) 86 c.set_pc(sigpanicPC) 87 } 88 89 func (c *sigctxt) pushCall(targetPC, resumePC uintptr) { 90 // Push the LR to stack, as we'll clobber it in order to 91 // push the call. The function being pushed is responsible 92 // for restoring the LR and setting the SP back. 93 // This extra slot is known to gentraceback. 94 sp := c.sp() - 8 95 c.set_sp(sp) 96 *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link() 97 // Set up PC and LR to pretend the function being signaled 98 // calls targetPC at resumePC. 99 c.set_link(uint64(resumePC)) 100 c.set_pc(uint64(targetPC)) 101 }