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 // +build linux 6 // +build mips64 mips64le 7 8 package runtime 9 10 import ( 11 "runtime/internal/sys" 12 "unsafe" 13 ) 14 15 func dumpregs(c *sigctxt) { 16 print("r0 ", hex(c.r0()), "\t") 17 print("r1 ", hex(c.r1()), "\n") 18 print("r2 ", hex(c.r2()), "\t") 19 print("r3 ", hex(c.r3()), "\n") 20 print("r4 ", hex(c.r4()), "\t") 21 print("r5 ", hex(c.r5()), "\n") 22 print("r6 ", hex(c.r6()), "\t") 23 print("r7 ", hex(c.r7()), "\n") 24 print("r8 ", hex(c.r8()), "\t") 25 print("r9 ", hex(c.r9()), "\n") 26 print("r10 ", hex(c.r10()), "\t") 27 print("r11 ", hex(c.r11()), "\n") 28 print("r12 ", hex(c.r12()), "\t") 29 print("r13 ", hex(c.r13()), "\n") 30 print("r14 ", hex(c.r14()), "\t") 31 print("r15 ", hex(c.r15()), "\n") 32 print("r16 ", hex(c.r16()), "\t") 33 print("r17 ", hex(c.r17()), "\n") 34 print("r18 ", hex(c.r18()), "\t") 35 print("r19 ", hex(c.r19()), "\n") 36 print("r20 ", hex(c.r20()), "\t") 37 print("r21 ", hex(c.r21()), "\n") 38 print("r22 ", hex(c.r22()), "\t") 39 print("r23 ", hex(c.r23()), "\n") 40 print("r24 ", hex(c.r24()), "\t") 41 print("r25 ", hex(c.r25()), "\n") 42 print("r26 ", hex(c.r26()), "\t") 43 print("r27 ", hex(c.r27()), "\n") 44 print("r28 ", hex(c.r28()), "\t") 45 print("r29 ", hex(c.r29()), "\n") 46 print("r30 ", hex(c.r30()), "\t") 47 print("r31 ", hex(c.r31()), "\n") 48 print("pc ", hex(c.pc()), "\t") 49 print("link ", hex(c.link()), "\n") 50 print("lo ", hex(c.lo()), "\t") 51 print("hi ", hex(c.hi()), "\n") 52 } 53 54 //go:nosplit 55 //go:nowritebarrierrec 56 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } 57 58 func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } 59 func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) } 60 func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) } 61 62 // preparePanic sets up the stack to look like a call to sigpanic. 63 func (c *sigctxt) preparePanic(sig uint32, gp *g) { 64 // We arrange link, and pc to pretend the panicking 65 // function calls sigpanic directly. 66 // Always save LINK to stack so that panics in leaf 67 // functions are correctly handled. This smashes 68 // the stack frame but we're not going back there 69 // anyway. 70 sp := c.sp() - sys.PtrSize 71 c.set_sp(sp) 72 *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link() 73 74 pc := gp.sigpc 75 76 // If we don't recognize the PC as code 77 // but we do recognize the link register as code, 78 // then assume this was a call to non-code and treat like 79 // pc == 0, to make unwinding show the context. 80 if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.link())).valid() { 81 pc = 0 82 } 83 84 // Don't bother saving PC if it's zero, which is 85 // probably a call to a nil func: the old link register 86 // is more useful in the stack trace. 87 if pc != 0 { 88 c.set_link(uint64(pc)) 89 } 90 91 // In case we are panicking from external C code 92 sigpanicPC := uint64(funcPC(sigpanic)) 93 c.set_r28(sigpanicPC >> 32 << 32) // RSB register 94 c.set_r30(uint64(uintptr(unsafe.Pointer(gp)))) 95 c.set_pc(sigpanicPC) 96 } 97
