1 // Copyright 2014 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 darwin 6 7 package runtime 8 9 import ( 10 "runtime/internal/sys" 11 "unsafe" 12 ) 13 14 func dumpregs(c *sigctxt) { 15 print("r0 ", hex(c.r0()), "\n") 16 print("r1 ", hex(c.r1()), "\n") 17 print("r2 ", hex(c.r2()), "\n") 18 print("r3 ", hex(c.r3()), "\n") 19 print("r4 ", hex(c.r4()), "\n") 20 print("r5 ", hex(c.r5()), "\n") 21 print("r6 ", hex(c.r6()), "\n") 22 print("r7 ", hex(c.r7()), "\n") 23 print("r8 ", hex(c.r8()), "\n") 24 print("r9 ", hex(c.r9()), "\n") 25 print("r10 ", hex(c.r10()), "\n") 26 print("r11 ", hex(c.r11()), "\n") 27 print("r12 ", hex(c.r12()), "\n") 28 print("r13 ", hex(c.r13()), "\n") 29 print("r14 ", hex(c.r14()), "\n") 30 print("r15 ", hex(c.r15()), "\n") 31 print("r16 ", hex(c.r16()), "\n") 32 print("r17 ", hex(c.r17()), "\n") 33 print("r18 ", hex(c.r18()), "\n") 34 print("r19 ", hex(c.r19()), "\n") 35 print("r20 ", hex(c.r20()), "\n") 36 print("r21 ", hex(c.r21()), "\n") 37 print("r22 ", hex(c.r22()), "\n") 38 print("r23 ", hex(c.r23()), "\n") 39 print("r24 ", hex(c.r24()), "\n") 40 print("r25 ", hex(c.r25()), "\n") 41 print("r26 ", hex(c.r26()), "\n") 42 print("r27 ", hex(c.r27()), "\n") 43 print("r28 ", hex(c.r28()), "\n") 44 print("r29 ", hex(c.r29()), "\n") 45 print("lr ", hex(c.lr()), "\n") 46 print("sp ", hex(c.sp()), "\n") 47 print("pc ", hex(c.pc()), "\n") 48 print("fault ", hex(c.fault()), "\n") 49 } 50 51 //go:nosplit 52 //go:nowritebarrierrec 53 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } 54 55 func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } 56 func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) } 57 58 // preparePanic sets up the stack to look like a call to sigpanic. 59 func (c *sigctxt) preparePanic(sig uint32, gp *g) { 60 // We arrange lr, and pc to pretend the panicking 61 // function calls sigpanic directly. 62 // Always save LR to stack so that panics in leaf 63 // functions are correctly handled. This smashes 64 // the stack frame but we're not going back there 65 // anyway. 66 sp := c.sp() - sys.SpAlign // needs only sizeof uint64, but must align the stack 67 c.set_sp(sp) 68 *(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr() 69 70 pc := gp.sigpc 71 72 // If we don't recognize the PC as code 73 // but we do recognize the link register as code, 74 // then assume this was a call to non-code and treat like 75 // pc == 0, to make unwinding show the context. 76 if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.lr())).valid() { 77 pc = 0 78 } 79 80 // Don't bother saving PC if it's zero, which is 81 // probably a call to a nil func: the old link register 82 // is more useful in the stack trace. 83 if pc != 0 { 84 c.set_lr(uint64(pc)) 85 } 86 87 // In case we are panicking from external C code 88 c.set_r28(uint64(uintptr(unsafe.Pointer(gp)))) 89 c.set_pc(uint64(funcPC(sigpanic))) 90 } 91
