#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

	MOVW	(R6), R6
	CMP	$0, R6
	B.NE	done

dropm:
	MOVW	$runtime·dropm(SB), R0
	BL	(R0)

done:
	// Done!
	RET

// void setg(G*); set g. for use by needm.
TEXT runtime·setg(SB),NOSPLIT|NOFRAME,$0-4
	MOVW	gg+0(FP), R0
	B	setg<>(SB)

TEXT setg<>(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	R0, g

	// Save g to thread-local storage.
#ifdef GOOS_windows
	B	runtime·save_g(SB)
#else

			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

		// it may hit stack split that is not expected here.
		if gp != nil {
			setg(nil)
		}
		badsignal(uintptr(sig), c)
		// Restore g
		if gp != nil {
			setg(gp)
		}
		return
	}

	setg(gp.m.gsignal)

	// If some non-Go code called sigaltstack, adjust.
	var gsignalStack gsignalStack

((SETNE|SETL|SETG|SETB|SETA)     (FlagEQ))     => (MOVLconst [0])
((SETNE|SETL|SETLE|SETB|SETBE)   (FlagLT_ULT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETA|SETAE)   (FlagLT_ULT)) => (MOVLconst [0])
((SETNE|SETL|SETLE|SETA|SETAE)   (FlagLT_UGT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETB|SETBE)   (FlagLT_UGT)) => (MOVLconst [0])
((SETNE|SETG|SETGE|SETB|SETBE)   (FlagGT_ULT)) => (MOVLconst [1])

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.