00000300  52 e8 5f 8a 37 3f 8b ef  77 fc 93 0c b5 50 3b 94  |R._.7?..w....P;.|
00000310  13 1b 3b 17 03 03 00 99  3e e8 05 5a 69 dc 0c 90  |..;.....>..Zi...|
00000320  a3 17 35 ea 27 2b da 64  44 72 30 5b 9c a5 6b 1b  |..5.'+.dDr0[..k.|
00000330  c2 a8 af 38 c3 43 52 14  fd ec a8 8b c9 ab 6b 67  |...8.CR.......kg|
00000340  32 84 f9 b4 e1 89 08 8f  6a c2 2a 17 b9 f5 92 c8  |2.......j.*.....|

	// Make sure MOV CR/DR continues to work after changing its movtabs.
	MOVL CR0, AX // 0f20c0
	MOVL CR0, DX // 0f20c2
	MOVL CR4, DI // 0f20e7
	MOVL AX, CR0 // 0f22c0
	MOVL DX, CR0 // 0f22c2
	MOVL DI, CR4 // 0f22e7
	MOVL DR0, AX // 0f21c0
	MOVL DR6, DX // 0f21f2
	MOVL DR7, SI // 0f21fe
	// Test other movtab entries.
	PUSHL SS // 16
	PUSHL FS // 0fa0
	POPL FS  // 0fa1
	POPL SS  // 17

	erroroffset   uint32
	errorselector uint32
	dataoffset    uint32
	dataselector  uint32
	registerarea  [80]uint8
	cr0npxstate   uint32
}

type context struct {
	contextflags      uint32
	dr0               uint32
	dr1               uint32
	dr2               uint32
	dr3               uint32
	dr6               uint32
	dr7               uint32
	floatsave         floatingsavearea
	seggs             uint32

	CR4:  "CR4",
	CR5:  "CR5",
	CR6:  "CR6",
	CR7:  "CR7",
	CR8:  "CR8",
	CR9:  "CR9",
	CR10: "CR10",
	CR11: "CR11",
	CR12: "CR12",
	CR13: "CR13",
	CR14: "CR14",
	CR15: "CR15",
	DR0:  "DR0",
	DR1:  "DR1",
	DR2:  "DR2",
	DR3:  "DR3",
	DR4:  "DR4",
	DR5:  "DR5",
	DR6:  "DR6",
	DR7:  "DR7",
	DR8:  "DR8",
	DR9:  "DR9",
	DR10: "DR10",
	DR11: "DR11",
	DR12: "DR12",

	segcs                uint16
	segds                uint16
	seges                uint16
	segfs                uint16
	seggs                uint16
	segss                uint16
	eflags               uint32
	dr0                  uint64
	dr1                  uint64
	dr2                  uint64
	dr3                  uint64
	dr6                  uint64
	dr7                  uint64
	rax                  uint64

	CR4:  "CR4",
	CR5:  "CR5",
	CR6:  "CR6",
	CR7:  "CR7",
	CR8:  "CR8",
	CR9:  "CR9",
	CR10: "CR10",
	CR11: "CR11",
	CR12: "CR12",
	CR13: "CR13",
	CR14: "CR14",
	CR15: "CR15",
	DR0:  "DR0",
	DR1:  "DR1",
	DR2:  "DR2",
	DR3:  "DR3",
	DR4:  "DR4",
	DR5:  "DR5",
	DR6:  "DR6",
	DR7:  "DR7",
	DR8:  "DR8",
	DR9:  "DR9",
	DR10: "DR10",
	DR11: "DR11",
	DR12: "DR12",

	MOVQ (AX), CR8                  // ERROR "invalid instruction"
	MOVQ DR0, (AX)                  // ERROR "invalid instruction"
	MOVQ DR2, (AX)                  // ERROR "invalid instruction"
	MOVQ DR3, (AX)                  // ERROR "invalid instruction"
	MOVQ DR6, (AX)                  // ERROR "invalid instruction"
	MOVQ DR7, (AX)                  // ERROR "invalid instruction"
	MOVQ (AX), DR0                  // ERROR "invalid instruction"

		{[]string{"192.168.1.210:9000/tmp/dir0", "192.168.1.210:9000/tmp/dir1", "192.168.1.210:9000/tmp/dir2", "192.168.110:9000/tmp/dir3"}, fmt.Errorf("'192.168.1.210:9000/tmp/dir0': invalid URL endpoint format: missing scheme http or https")},
	}

	for _, testCase := range testCases {
		_, err := NewEndpoints(testCase.args...)

	if _, err := exec.LookPath("gcc"); err != nil {
		t.Skip("skipping test: gcc is missing")
	}

	tmpdir := t.TempDir()

	dir0, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	defer os.Chdir(dir0)

	const src = `
#include <stdint.h>
#include <windows.h>

uintptr_t cfunc(void) {
   SetLastError(123);
   return 0;
}
`

	CR4:  "%cr4",
	CR5:  "%cr5",
	CR6:  "%cr6",
	CR7:  "%cr7",
	CR8:  "%cr8",
	CR9:  "%cr9",
	CR10: "%cr10",
	CR11: "%cr11",
	CR12: "%cr12",
	CR13: "%cr13",
	CR14: "%cr14",
	CR15: "%cr15",
	DR0:  "%db0",
	DR1:  "%db1",
	DR2:  "%db2",
	DR3:  "%db3",
	DR4:  "%db4",
	DR5:  "%db5",
	DR6:  "%db6",
	DR7:  "%db7",
	TR0:  "%tr0",
	TR1:  "%tr1",
	TR2:  "%tr2",
	TR3:  "%tr3",