a6e6e3d8ca
- Created apps/hello-world/hello-world.S: AT&T assembly user program that calls SYS_WRITE to print 'Hello, World' then SYS_EXIT(0) - Created apps/user.ld: linker script for user apps at 0x08048000 - Created scripts/build_apps.sh: builds each app dir into flat binary - Updated CMakeLists.txt: added apps build target in ISO pipeline - Updated gen_initrd.sh: packs built binaries from build/apps_bin/ - Updated kernel.c: replaced inline machine code with VFS-based loading of hello-world from /initrd/hello-world via cpio_find() Verified: hello-world binary (49 bytes) loads from CPIO initrd, prints 'Hello, World', and exits with code 0.
29 lines
786 B
ArmAsm
29 lines
786 B
ArmAsm
# hello-world.S - ClaudeOS user-mode hello world application
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# Assembled as flat binary, loaded at USER_CODE_START (0x08048000)
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#
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# Uses INT 0x80 system calls:
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# SYS_WRITE(1): EAX=1, EBX=fd, ECX=buf, EDX=len
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# SYS_EXIT(0): EAX=0, EBX=code
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.code32
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.section .text
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.globl _start
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_start:
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/* SYS_WRITE(stdout, "Hello, World\n", 13) */
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movl $1, %eax /* SYS_WRITE */
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movl $1, %ebx /* fd = stdout */
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movl $msg, %ecx /* buf = absolute address of message */
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movl $13, %edx /* len = 13 */
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int $0x80
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/* SYS_EXIT(0) */
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movl $0, %eax /* SYS_EXIT */
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movl $0, %ebx /* exit code = 0 */
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int $0x80
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/* Safety: infinite loop (should never reach here) */
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jmp .
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msg:
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.ascii "Hello, World\n"
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