x86_64-asm: =m operand fixes

The problem was with tcctest.c:

    unsigned set;
    __asm__("btsl %1,%0" : "=m"(set) : "Ir"(20) : "cc");

when with tcc compiled with the HAVE_SELINUX option, run with
tcc -run, it would use large addresses far beyond the 32bits
range when tcc did not use the pc-relative mode for accessing
'set' in global data memory.  In fact the assembler did not
know about %rip at all.

Changes:
- memory operands use (%rax) not (%eax)
- conversion from VT_LLOCAL: use type VT_PTR
- support 'k' modifier
- support %rip register
- support X(%rip) pc-relative addresses

The test in tcctest.c is from Michael Matz.

1 files changed, 2 insertions, 0 deletions

diff --git a/tccrun.c b/tccrun.c
index 5575eb5..37e9303 100644
--- a/tccrun.c
+++ b/tccrun.c
@@ -52,6 +52,8 @@ static void *win64_add_function_table(TCCState *s1);
 static void win64_del_function_table(void *);
 #endif
 
+// #define HAVE_SELINUX
+
 /* ------------------------------------------------------------- */
 /* Do all relocations (needed before using tcc_get_symbol())
    Returns -1 on error. */