#include <signal.h>
#include <string.h>
#include "libcgo.h"
#include "libcgo_unix.h"

static void* threadentry(void*);
static void (*setg_gcc)(void*);

void
x_cgo_init(G *g, void (*setg)(void*))
{
	setg_gcc = setg;
	_cgo_set_stacklo(g, NULL);
}


void
_cgo_sys_thread_start(ThreadStart *ts)
{
	pthread_attr_t attr;
	sigset_t ign, oset;
	pthread_t p;
	size_t size;
	int err;

static void (*setg_gcc)(void*);

// This will be set in gcc_android.c for android-specific customization.
void (*x_cgo_inittls)(void **tlsg, void **tlsbase) __attribute__((common));

void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
	uintptr *pbounds;

	/* The memory sanitizer distributed with versions of clang
	   before 3.8 has a bug: if you call mmap before malloc, mmap

#include <signal.h>
#include <ucontext.h>
#include "libcgo.h"
#include "libcgo_unix.h"

static void* threadentry(void*);
static void (*setg_gcc)(void*);

void
x_cgo_init(G *g, void (*setg)(void*))
{
	ucontext_t ctx;

	setg_gcc = setg;
	if (getcontext(&ctx) != 0)
		perror("runtime/cgo: getcontext failed");
	g->stacklo = (uintptr_t)ctx.uc_stack.ss_sp;

static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	free(v);

	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
	return nil;
}

void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
	uintptr *pbounds;

	/* The memory sanitizer distributed with versions of clang
	   before 3.8 has a bug: if you call mmap before malloc, mmap

			fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", buf);
		}
	}
}

#endif // TARGET_OS_IPHONE

void
x_cgo_init(G *g, void (*setg)(void*))
{
	//fprintf(stderr, "x_cgo_init = %p\n", &x_cgo_init); // aid debugging in presence of ASLR
	setg_gcc = setg;
	_cgo_set_stacklo(g, NULL);

#if TARGET_OS_IPHONE
	darwin_arm_init_mach_exception_handler();
	darwin_arm_init_thread_exception_port();

	mov r4, r0
	mov r5, r1
	mov r0, r2

	// Because the assembler might target an earlier revision of the ISA
	// by default, we encode BLX as a .word.
	.word 0xe12fff35 // blx r5 // setg(g)
	.word 0xe12fff34 // blx r4 // fn()

	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}


#ifdef __ELF__
.section .note.GNU-stack,"",%progbits

TEXT runtime·save_g(SB),NOSPLIT,$0
	MRC	15, 0, R0, C13, C0, 2
	ADD	$0xe10, R0
	MOVW 	$runtime·tls_g(SB), R11
	MOVW	(R11), R11
	MOVW	g, R11<<2(R0)
	MOVW	g, R0	// preserve R0 across call to setg<>
	RET

// load_g loads the g register from thread-local memory,
// for use after calling externally compiled
// ARM code that overwrote those registers.
// Get the value from the _TEB->TlsSlots array.

// explaining why.
//
//go:nosplit
func debugCallCheck(pc uintptr) string {
	// No user calls from the system stack.
	if getg() != getg().m.curg {
		return debugCallSystemStack
	}
	if sp := getcallersp(); !(getg().stack.lo < sp && sp <= getg().stack.hi) {
		// Fast syscalls (nanotime) and racecall switch to the
		// g0 stack without switching g. We can't safely make

//
//go:linkname runtime_setProfLabel runtime/pprof.runtime_setProfLabel
func runtime_setProfLabel(labels unsafe.Pointer) {
	// Introduce race edge for read-back via profile.
	// This would more properly use &getg().labels as the sync address,
	// but we do the read in a signal handler and can't call the race runtime then.
	//
	// This uses racereleasemerge rather than just racerelease so

}

func notetsleep(n *note, ns int64) bool {
	gp := getg()
	if gp != gp.m.g0 && gp.m.preemptoff != "" {
		throw("notetsleep not on g0")
	}

	return notetsleep_internal(n, ns)
}

// same as runtime·notetsleep, but called on user g (not g0)
// calls only nosplit functions between entersyscallblock/exitsyscall.
func notetsleepg(n *note, ns int64) bool {
	gp := getg()
	if gp == gp.m.g0 {
		throw("notetsleepg on g0")