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tinycc: scaffold/main.c: running tcc-compiled binary #2.

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* scaffold/main.c (main)[__i386__]: Rename from _start.
This commit is contained in:
Jan Nieuwenhuizen 2017-09-03 00:37:39 +02:00
parent 7619190d5c
commit 2896ce46c4
1 changed files with 42 additions and 10 deletions
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52
scaffold/main.c
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@ -18,13 +18,16 @@
* along with Mes. If not, see <http://www.gnu.org/licenses/>. * along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/ */
#if __i386__ // #if __i386__
#define main _start // #define main _start
#endif // #endif
int int
main (int argc, char *argv[]) main (int argc, char *argv[])
{ {
#if 0
#if __MESC__ #if __MESC__
asm ("mov____$i32,%ebx !42"); asm ("mov____$i32,%ebx !42");
asm ("mov____$i32,%eax !1"); asm ("mov____$i32,%eax !1");
@ -34,29 +37,54 @@ main (int argc, char *argv[])
asm (".byte 144"); asm (".byte 144");
asm (".byte 144"); asm (".byte 144");
#if 1 //MESC_TCC #if 1 //MESC_TCC
asm (".byte 187"); asm (".byte 184"); //mov $1,%eax
asm (".byte 42"); asm (".byte 42");
asm (".byte 0"); asm (".byte 0");
asm (".byte 0"); asm (".byte 0");
asm (".byte 0"); asm (".byte 0");
asm (".byte 184"); asm (".byte 201"); // leave
asm (".byte 195"); // ret
#if 0
asm (".byte 187"); // mov $42,%ebx
asm (".byte 42");
asm (".byte 0");
asm (".byte 0");
asm (".byte 0");
asm (".byte 184"); //mov $1,%eax
asm (".byte 1"); asm (".byte 1");
asm (".byte 0"); asm (".byte 0");
asm (".byte 0"); asm (".byte 0");
asm (".byte 0"); asm (".byte 0");
asm (".byte 205"); asm (".byte 201"); // leave
asm (".byte 195"); // ret
asm (".byte 205"); //int $0x80
asm (".byte 128"); asm (".byte 128");
asm (".byte 137"); asm (".byte 137"); //%eax,-0x4(%ebp)
asm (".byte 69"); asm (".byte 69");
asm (".byte 252"); asm (".byte 252");
asm (".byte 244"); //hlt
// asm (".byte 201");
// asm (".byte 195");
#endif
#else #else
asm ("mov $42,%ebx"); asm ("mov $42,%eax");
asm ("mov $1,%eax"); asm ("leave");
asm ("int $128"); asm ("ret");
// asm ("mov $42,%ebx");
// asm ("mov $1,%eax");
// asm ("int $128");
#endif #endif
asm (".byte 144"); asm (".byte 144");
@ -68,9 +96,13 @@ main (int argc, char *argv[])
asm ("mov $42,%rbx"); asm ("mov $42,%rbx");
asm ("mov $1,%rax"); asm ("mov $1,%rax");
asm ("int $128"); asm ("int $128");
asm ("hlt");
#else #else
#error "platform not supported" #error "platform not supported"
#endif #endif
// not reached // not reached
#endif
return 42; return 42;
} }