Update asm example

1 files changed, 10 insertions, 6 deletions

diff --git a/bxgen.c b/bxgen.c
index 95a3e03..d64f6b2 100755
--- a/bxgen.c
+++ b/bxgen.c
@@ -1046,6 +1046,7 @@ void unit_write(Pool *pool, i64 unit, u16 target, i64 io_out, void *io_user_data
   //
   //  Online assembler
   //  https://defuse.ca/online-x86-assembler.htm
+  //  https://shell-storm.org/online/Online-Assembler-and-Disassembler/
 
   BX_ASSERT(pool != NULL && pool->entities != NULL);
   BX_ASSERT(pool->entities[unit].is_enabled);
@@ -1089,11 +1090,10 @@ void unit_write(Pool *pool, i64 unit, u16 target, i64 io_out, void *io_user_data
   #define WRITE_4(x)      io_write( io_out, 4,                            &(u32)   {         x }, io_user_data )
   #define WRITE_8(x)      io_write( io_out, 8,                            &(u64)   {         x }, io_user_data )
 
-  u8 code[16] = {
-    0xb8,                   // mov rax
-    0x3c, 0, 0, 0,          // 60            // exit
-    0x48, 0x31, 0xff,       // xor rdx, rdx  // rdx = 0
-    0x0f, 0x05,             // syscall
+  u8 code[32] = {
+    0xb8, 0x3c, 0x00, 0x00, 0x00, // mov eax, 60
+    0xbf, 0x2a, 0x00, 0x00, 0x00, // mov edi, 42
+    0x0f, 0x05,                   // syscall
   };
 
   u64 code_offset  = bx_align(ELF_HEADER_SIZE + ELF_PROGRAM_HEADER_SIZE, X86_64_ALIGNMENT);
@@ -2078,7 +2078,7 @@ void bx_assert(b8 condition, c8 const *message, u32 line, c8 const *file) {
 
   fflush(stdout);
   fprintf(stderr, "\r\x1b[31mASSERTION:\x1b[37m `\x1b[33m%s\x1b[37m` is false in \x1b[36m%s:%d\x1b[37m\n", message, file, line);
-  abort();
+  exit(-1);
 }
 
 //  IO dispatch procedure
@@ -2281,6 +2281,10 @@ int main(int argc, char **argv) {
   printf("Writing ELF x86_64 executable...\n");
   u_elf_x86_64(u, "test_foo");
 
+  i32 ret = system("./test_foo");
+
+  BX_ASSERT(WEXITSTATUS(ret) == 42);
+
   printf("\nBye!\n");
   return 0;
 }