| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package runtime |
| |
| import "unsafe" |
| |
| type sigctxt struct { |
| info *siginfo |
| ctxt unsafe.Pointer |
| } |
| |
| func (c *sigctxt) regs() *regs64 { return &(*ucontext)(c.ctxt).uc_mcontext.ss } |
| func (c *sigctxt) r0() uint64 { return c.regs().x[0] } |
| func (c *sigctxt) r1() uint64 { return c.regs().x[1] } |
| func (c *sigctxt) r2() uint64 { return c.regs().x[2] } |
| func (c *sigctxt) r3() uint64 { return c.regs().x[3] } |
| func (c *sigctxt) r4() uint64 { return c.regs().x[4] } |
| func (c *sigctxt) r5() uint64 { return c.regs().x[5] } |
| func (c *sigctxt) r6() uint64 { return c.regs().x[6] } |
| func (c *sigctxt) r7() uint64 { return c.regs().x[7] } |
| func (c *sigctxt) r8() uint64 { return c.regs().x[8] } |
| func (c *sigctxt) r9() uint64 { return c.regs().x[9] } |
| func (c *sigctxt) r10() uint64 { return c.regs().x[10] } |
| func (c *sigctxt) r11() uint64 { return c.regs().x[11] } |
| func (c *sigctxt) r12() uint64 { return c.regs().x[12] } |
| func (c *sigctxt) r13() uint64 { return c.regs().x[13] } |
| func (c *sigctxt) r14() uint64 { return c.regs().x[14] } |
| func (c *sigctxt) r15() uint64 { return c.regs().x[15] } |
| func (c *sigctxt) r16() uint64 { return c.regs().x[16] } |
| func (c *sigctxt) r17() uint64 { return c.regs().x[17] } |
| func (c *sigctxt) r18() uint64 { return c.regs().x[18] } |
| func (c *sigctxt) r19() uint64 { return c.regs().x[19] } |
| func (c *sigctxt) r20() uint64 { return c.regs().x[20] } |
| func (c *sigctxt) r21() uint64 { return c.regs().x[21] } |
| func (c *sigctxt) r22() uint64 { return c.regs().x[22] } |
| func (c *sigctxt) r23() uint64 { return c.regs().x[23] } |
| func (c *sigctxt) r24() uint64 { return c.regs().x[24] } |
| func (c *sigctxt) r25() uint64 { return c.regs().x[25] } |
| func (c *sigctxt) r26() uint64 { return c.regs().x[26] } |
| func (c *sigctxt) r27() uint64 { return c.regs().x[27] } |
| func (c *sigctxt) r28() uint64 { return c.regs().x[28] } |
| func (c *sigctxt) r29() uint64 { return c.regs().fp } |
| func (c *sigctxt) lr() uint64 { return c.regs().lr } |
| func (c *sigctxt) sp() uint64 { return c.regs().sp } |
| func (c *sigctxt) pc() uint64 { return c.regs().pc } |
| func (c *sigctxt) fault() uint64 { return uint64(uintptr(unsafe.Pointer(c.info.si_addr))) } |
| |
| func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) } |
| func (c *sigctxt) sigaddr() uint64 { return uint64(uintptr(unsafe.Pointer(c.info.si_addr))) } |
| |
| func (c *sigctxt) set_pc(x uint64) { c.regs().pc = x } |
| func (c *sigctxt) set_sp(x uint64) { c.regs().sp = x } |
| func (c *sigctxt) set_lr(x uint64) { c.regs().lr = x } |
| func (c *sigctxt) set_r28(x uint64) { c.regs().x[28] = x } |
| |
| func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) } |
| func (c *sigctxt) set_sigaddr(x uint64) { |
| c.info.si_addr = (*byte)(unsafe.Pointer(uintptr(x))) |
| } |
| |
| func (c *sigctxt) fixsigcode(sig uint32) { |
| switch sig { |
| case _SIGTRAP: |
| // OS X sets c.sigcode() == TRAP_BRKPT unconditionally for all SIGTRAPs, |
| // leaving no way to distinguish a breakpoint-induced SIGTRAP |
| // from an asynchronous signal SIGTRAP. |
| // They all look breakpoint-induced by default. |
| // Try looking at the code to see if it's a breakpoint. |
| // The assumption is that we're very unlikely to get an |
| // asynchronous SIGTRAP at just the moment that the |
| // PC started to point at unmapped memory. |
| pc := uintptr(c.pc()) |
| // OS X will leave the pc just after the instruction. |
| code := (*uint32)(unsafe.Pointer(pc - 4)) |
| if *code != 0xd4200000 { |
| // SIGTRAP on something other than breakpoint. |
| c.set_sigcode(_SI_USER) |
| } |
| } |
| } |