1 // Copyright 2009 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 darwin dragonfly freebsd linux nacl netbsd openbsd 6 7 package runtime 8 9 import "unsafe" 10 11 func dumpregs(c *sigctxt) { 12 print("trap ", hex(c.trap()), "\n") 13 print("error ", hex(c.error()), "\n") 14 print("oldmask ", hex(c.oldmask()), "\n") 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("fp ", hex(c.fp()), "\n") 27 print("ip ", hex(c.ip()), "\n") 28 print("sp ", hex(c.sp()), "\n") 29 print("lr ", hex(c.lr()), "\n") 30 print("pc ", hex(c.pc()), "\n") 31 print("cpsr ", hex(c.cpsr()), "\n") 32 print("fault ", hex(c.fault()), "\n") 33 } 34 35 //go:nosplit 36 //go:nowritebarrierrec 37 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) } 38 39 func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) } 40 func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) } 41 42 // preparePanic sets up the stack to look like a call to sigpanic. 43 func (c *sigctxt) preparePanic(sig uint32, gp *g) { 44 // We arrange lr, and pc to pretend the panicking 45 // function calls sigpanic directly. 46 // Always save LR to stack so that panics in leaf 47 // functions are correctly handled. This smashes 48 // the stack frame but we're not going back there 49 // anyway. 50 sp := c.sp() - 4 51 c.set_sp(sp) 52 *(*uint32)(unsafe.Pointer(uintptr(sp))) = c.lr() 53 54 pc := gp.sigpc 55 56 // If we don't recognize the PC as code 57 // but we do recognize the link register as code, 58 // then assume this was a call to non-code and treat like 59 // pc == 0, to make unwinding show the context. 60 if pc != 0 && !findfunc(pc).valid() && findfunc(uintptr(c.lr())).valid() { 61 pc = 0 62 } 63 64 // Don't bother saving PC if it's zero, which is 65 // probably a call to a nil func: the old link register 66 // is more useful in the stack trace. 67 if pc != 0 { 68 c.set_lr(uint32(pc)) 69 } 70 71 // In case we are panicking from external C code 72 c.set_r10(uint32(uintptr(unsafe.Pointer(gp)))) 73 c.set_pc(uint32(funcPC(sigpanic))) 74 } 75
