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 // +build linux 6 // +build mips mipsle 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 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } 55 func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } 56 func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) } 57 func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) } 58 59 // preparePanic sets up the stack to look like a call to sigpanic. 60 func (c *sigctxt) preparePanic(sig uint32, gp *g) { 61 // We arrange link, and pc to pretend the panicking 62 // function calls sigpanic directly. 63 // Always save LINK to stack so that panics in leaf 64 // functions are correctly handled. This smashes 65 // the stack frame but we're not going back there 66 // anyway. 67 sp := c.sp() - sys.MinFrameSize 68 c.set_sp(sp) 69 *(*uint32)(unsafe.Pointer(uintptr(sp))) = c.link() 70 71 pc := gp.sigpc 72 73 // If we don't recognize the PC as code 74 // but we do recognize the link register as code, 75 // then assume this was a call to non-code and treat like 76 // pc == 0, to make unwinding show the context. 77 if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.link())).valid() { 78 pc = 0 79 } 80 81 // Don't bother saving PC if it's zero, which is 82 // probably a call to a nil func: the old link register 83 // is more useful in the stack trace. 84 if pc != 0 { 85 c.set_link(uint32(pc)) 86 } 87 88 // In case we are panicking from external C code 89 c.set_r30(uint32(uintptr(unsafe.Pointer(gp)))) 90 c.set_pc(uint32(funcPC(sigpanic))) 91 } 92
