Source file src/runtime/signal_darwin_arm64.go

     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	package runtime
     6	
     7	import "unsafe"
     8	
     9	type sigctxt struct {
    10		info *siginfo
    11		ctxt unsafe.Pointer
    12	}
    13	
    14	//go:nosplit
    15	//go:nowritebarrierrec
    16	func (c *sigctxt) regs() *regs64 { return &(*ucontext)(c.ctxt).uc_mcontext.ss }
    17	
    18	func (c *sigctxt) r0() uint64  { return c.regs().x[0] }
    19	func (c *sigctxt) r1() uint64  { return c.regs().x[1] }
    20	func (c *sigctxt) r2() uint64  { return c.regs().x[2] }
    21	func (c *sigctxt) r3() uint64  { return c.regs().x[3] }
    22	func (c *sigctxt) r4() uint64  { return c.regs().x[4] }
    23	func (c *sigctxt) r5() uint64  { return c.regs().x[5] }
    24	func (c *sigctxt) r6() uint64  { return c.regs().x[6] }
    25	func (c *sigctxt) r7() uint64  { return c.regs().x[7] }
    26	func (c *sigctxt) r8() uint64  { return c.regs().x[8] }
    27	func (c *sigctxt) r9() uint64  { return c.regs().x[9] }
    28	func (c *sigctxt) r10() uint64 { return c.regs().x[10] }
    29	func (c *sigctxt) r11() uint64 { return c.regs().x[11] }
    30	func (c *sigctxt) r12() uint64 { return c.regs().x[12] }
    31	func (c *sigctxt) r13() uint64 { return c.regs().x[13] }
    32	func (c *sigctxt) r14() uint64 { return c.regs().x[14] }
    33	func (c *sigctxt) r15() uint64 { return c.regs().x[15] }
    34	func (c *sigctxt) r16() uint64 { return c.regs().x[16] }
    35	func (c *sigctxt) r17() uint64 { return c.regs().x[17] }
    36	func (c *sigctxt) r18() uint64 { return c.regs().x[18] }
    37	func (c *sigctxt) r19() uint64 { return c.regs().x[19] }
    38	func (c *sigctxt) r20() uint64 { return c.regs().x[20] }
    39	func (c *sigctxt) r21() uint64 { return c.regs().x[21] }
    40	func (c *sigctxt) r22() uint64 { return c.regs().x[22] }
    41	func (c *sigctxt) r23() uint64 { return c.regs().x[23] }
    42	func (c *sigctxt) r24() uint64 { return c.regs().x[24] }
    43	func (c *sigctxt) r25() uint64 { return c.regs().x[25] }
    44	func (c *sigctxt) r26() uint64 { return c.regs().x[26] }
    45	func (c *sigctxt) r27() uint64 { return c.regs().x[27] }
    46	func (c *sigctxt) r28() uint64 { return c.regs().x[28] }
    47	func (c *sigctxt) r29() uint64 { return c.regs().fp }
    48	func (c *sigctxt) lr() uint64  { return c.regs().lr }
    49	func (c *sigctxt) sp() uint64  { return c.regs().sp }
    50	
    51	//go:nosplit
    52	//go:nowritebarrierrec
    53	func (c *sigctxt) pc() uint64 { return c.regs().pc }
    54	
    55	func (c *sigctxt) fault() uintptr { return uintptr(unsafe.Pointer(c.info.si_addr)) }
    56	
    57	func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
    58	func (c *sigctxt) sigaddr() uint64 { return uint64(uintptr(unsafe.Pointer(c.info.si_addr))) }
    59	
    60	func (c *sigctxt) set_pc(x uint64)  { c.regs().pc = x }
    61	func (c *sigctxt) set_sp(x uint64)  { c.regs().sp = x }
    62	func (c *sigctxt) set_lr(x uint64)  { c.regs().lr = x }
    63	func (c *sigctxt) set_r28(x uint64) { c.regs().x[28] = x }
    64	
    65	func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }
    66	func (c *sigctxt) set_sigaddr(x uint64) {
    67		c.info.si_addr = (*byte)(unsafe.Pointer(uintptr(x)))
    68	}
    69	
    70	//go:nosplit
    71	func (c *sigctxt) fixsigcode(sig uint32) {
    72		switch sig {
    73		case _SIGTRAP:
    74			// OS X sets c.sigcode() == TRAP_BRKPT unconditionally for all SIGTRAPs,
    75			// leaving no way to distinguish a breakpoint-induced SIGTRAP
    76			// from an asynchronous signal SIGTRAP.
    77			// They all look breakpoint-induced by default.
    78			// Try looking at the code to see if it's a breakpoint.
    79			// The assumption is that we're very unlikely to get an
    80			// asynchronous SIGTRAP at just the moment that the
    81			// PC started to point at unmapped memory.
    82			pc := uintptr(c.pc())
    83			// OS X will leave the pc just after the instruction.
    84			code := (*uint32)(unsafe.Pointer(pc - 4))
    85			if *code != 0xd4200000 {
    86				// SIGTRAP on something other than breakpoint.
    87				c.set_sigcode(_SI_USER)
    88			}
    89		}
    90	}
    91	

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