Fix for Bug 3671 - QEMU GDB stub listens on IPv6-only port on Windows 7
The connection string used by the GDB stub does not specify which
version of the Internet Protocol should be used by the port on
which it listens. On host platforms with IPv6 support, such as
Windows 7, this means that the stub listens on an IPv6-only port.
Since the GDB client uses IPv4, this means that the client cannot
connect to QEMU.
.code16
.globl vm86_code_start
.globl vm86_code_end
#define GET_OFFSET(x) ((x) - vm86_code_start + 0x100)
vm86_code_start:
movw $GET_OFFSET(hello_world), %dx
movb $0x09, %ah
int $0x21
/* prepare int 0x90 vector */
xorw %ax, %ax
movw %ax, %es
es movw $GET_OFFSET(int90_test), 0x90 * 4
es movw %cs, 0x90 * 4 + 2
/* launch int 0x90 */
int $0x90
/* test IF support */
movw $GET_OFFSET(IF_msg), %dx
movb $0x09, %ah
int $0x21
pushf
popw %dx
movb $0xff, %ah
int $0x21
cli
pushf
popw %dx
movb $0xff, %ah
int $0x21
sti
pushfl
popl %edx
movb $0xff, %ah
int $0x21
#if 0
movw $GET_OFFSET(IF_msg1), %dx
movb $0x09, %ah
int $0x21
pushf
movw %sp, %bx
andw $~0x200, (%bx)
popf
#else
cli
#endif
pushf
popw %dx
movb $0xff, %ah
int $0x21
pushfl
movw %sp, %bx
orw $0x200, (%bx)
popfl
pushfl
popl %edx
movb $0xff, %ah
int $0x21
movb $0x00, %ah
int $0x21
int90_test:
pushf
pop %dx
movb $0xff, %ah
int $0x21
movw %sp, %bx
movw 4(%bx), %dx
movb $0xff, %ah
int $0x21
movw $GET_OFFSET(int90_msg), %dx
movb $0x09, %ah
int $0x21
iret
int90_msg:
.string "INT90 started\n$"
hello_world:
.string "Hello VM86 world\n$"
IF_msg:
.string "VM86 IF test\n$"
IF_msg1:
.string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
vm86_code_end: