作者enthos (影斯作业系统)
看板CompilerDev
标题[分享] How to build DOS COM files with GCC
时间Fri Oct 30 02:22:12 2020
之前意外看到的 gcc 特殊应用。
https://nullprogram.com/blog/2014/12/09/
"The most technically interesting part is that I didn’t need
any DOS development tools to create this!"
Compiler Options
Here are the essential compiler options.
-std=gnu99 -Os -nostdlib -m32 -march=i386 -ffreestanding
Linker Options
The -Wl option is used to pass arguments to the linker (ld).
We need it since we’re doing all this in one call to GCC.
-Wl,--nmagic,--script=com.ld
com.ld
OUTPUT_FORMAT(binary)
SECTIONS
{
. = 0x0100;
.text :
{
*(.text);
}
.data :
{
*(.data);
*(.bss);
*(.rodata);
}
_heap = ALIGN(4);
}
Program Startup
asm (".code16gcc\n"
"call dosmain\n"
"mov $0x4C, %ah\n"
"int $0x21\n");
static void print(char *string)
{
asm volatile ("mov $0x09, %%ah\n"
"int $0x21\n"
: /* no output */
: "d"(string)
: "ah");
}
int dosmain(void)
{
print("Hello, World!\n$");
return 0;
}
--
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1F：推 LPH66: 酷 XD 不过这可能也是得利於 COM 格式没有 metadata 的关系 10/30 02:45