// push the call. The function being pushed is responsible
	// for restoring the LR and setting the SP back.
	// This extra space is known to gentraceback.
	sp := c.sp() - 16 // SP needs 16-byte alignment
	c.set_sp(sp)
	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
	// Make sure a valid frame pointer is saved on the stack so that the
	// frame pointer checks in adjustframe are happy, if they're enabled.

	// badCharSkip[b] is len(pattern).
	//
	// Whenever a mismatch is found with byte b in the text, we can safely
	// shift the matching frame at least badCharSkip[b] until the next time
	// the matching char could be in alignment.
	badCharSkip [256]int

	// goodSuffixSkip[i] defines how far we can shift the matching frame given
	// that the suffix pattern[i+1:] matches, but the byte pattern[i] does
	// not. There are two cases to consider:
	//

	case *ast.BinaryExpr:
		// "It is valid both to add and to subtract offsets from a
		// pointer in this way. It is also valid to use &^ to round
		// pointers, usually for alignment."
		switch x.Op {
		case token.ADD, token.SUB, token.AND_NOT:
			// TODO(mdempsky): Match compiler
			// semantics. ADD allows a pointer on either
			// side; SUB and AND_NOT don't care about RHS.

// cgo uses -Werror. See #65290.
#pragma GCC diagnostic ignored "-Wpragmas"
#pragma GCC diagnostic ignored "-Wunknown-warning-option"
#pragma GCC diagnostic ignored "-Watomic-alignment"

#include <pthread.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> // strerror
#include <time.h>
#include "libcgo.h"
#include "libcgo_unix.h"

type AuxCSect32 struct {
	Xscnlen   uint32 // Length or symbol table index
	Xparmhash uint32 // Offset of parameter type-check string
	Xsnhash   uint16 // .typchk section number
	Xsmtyp    uint8  // Symbol alignment and type
	Xsmclas   uint8  // Storage-mapping class
	Xstab     uint32 // Reserved
	Xsnstab   uint16 // Reserved
}

type AuxCSect64 struct {
	Xscnlenlo uint32 // Lower 4 bytes of length or symbol table index

	Hash        uint32  // hash of type; avoids computation in hash tables
	TFlag       TFlag   // extra type information flags
	Align_      uint8   // alignment of variable with this type
	FieldAlign_ uint8   // alignment of struct field with this type
	Kind_       Kind    // enumeration for C
	// function for comparing objects of this type
	// (ptr to object A, ptr to object B) -> ==?

	FilterHTML uint = 1 << iota

	// Strip Escape characters bracketing escaped text segments
	// instead of passing them through unchanged with the text.
	StripEscape

	// Force right-alignment of cell content.
	// Default is left-alignment.
	AlignRight

	// Handle empty columns as if they were not present in
	// the input in the first place.
	DiscardEmptyColumns

	char a[1024];

	recur(4, a);
	sigioSeen = 1;
}

static jmp_buf jmp;
static char* nullPointer;

// An arbitrary function which requires proper stack alignment; see
// http://golang.org/issue/17641.
static void callWithVarargs(void* dummy, ...) {
	va_list args;
	va_start(args, dummy);
	va_end(args);
}

// Signal handler for SIGSEGV on a C thread.

	JLS	back

/*
 * forward copy loop
 */
forward:
	// If REP MOVSB isn't fast, don't use it
	CMPB	internal∕cpu·X86+const_offsetX86HasERMS(SB), $1 // enhanced REP MOVSB/STOSB
	JNE	fwdBy4

	// Check alignment
	MOVL	SI, AX
	ORL	DI, AX
	TESTL	$3, AX
	JEQ	fwdBy4

	// Do 1 byte at a time
	MOVL	BX, CX
	REP;	MOVSB
	RET

fwdBy4:
	// Do 4 bytes at a time
	MOVL	BX, CX
	SHRL	$2, CX
	ANDL	$3, BX

	// these symbols at the beginning of their respective section if there
	// aren't real symbols, their alignment might not match the
	// first symbol alignment. Therefore, there are explicitly put at the
	// beginning of their section with the same alignment.
	if !(ctxt.DynlinkingGo() && ctxt.HeadType == objabi.Hdarwin) && !(ctxt.HeadType == objabi.Haix && ctxt.LinkMode == LinkExternal) {
		return
	}