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内核 MMAP(addr,length,prot,flags,fd,offset)：fd=-1 + MAP_ANONYMOUS 走匿名映射（分配物理页、清零后映射到本进程新 VA，对齐 Linux"匿名必为零"语义）；fd 是带 mmap_info 的 devfs 设备（当前仅 /dev/fb0）则把 [phys+offset, phys+offset+len) 按页映射进调用者地址空间（PTE_USER|WRITE）。addr/MAP_FIXED 暂未实现，一律由内核挑 VA 并返回真实起始地址。新增 PROT_*/MAP_*/MMAP_FD_ANON 常量。 参数次序与 Linux mmap 完全一致（rdi/rsi/rdx/r10/r8/r9），syscall_entry 的搬运顺序本就是这个约定，SDK 侧 vpsdk/syscall.vp 加 mmap() 助手走 _syscall6。stdlib.malloc 随之改为匿名映射调用（fd=-1、MAP_PRIVATE|MAP_ANONYMOUS、PROT_READ|PROT_WRITE），行为与原 MMAP(size) 一致且多一层清零。
146 lines
7.5 KiB
Plaintext
146 lines
7.5 KiB
Plaintext
# ============================================================================
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# 系统调用号表（SDK 侧镜像）。**与 VKernel/Kernel/intr/syscall.vp 的同名 enum 逐条对应**：
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# vpsdk 不允许依赖 VKernel，所以这里是一份必须手工同步的副本 —— 增删/改号/改名两边一起改。
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# 编号口径：与 Linux x86-64 ABI 同名同号；Linux 有而我们未实现的留空不占号；
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# 我们独有的能力不再新增 syscall，最终走 devfs 设备文件或下沉到用户层（见 0x1000+ 段的标注）。
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# ============================================================================
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enum Syscall:
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# ---- Linux 对齐段（号 = Linux x86-64 的号）----
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READ = 0 # read(fd, buf, count)
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WRITE = 1 # write(fd, buf, count)
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OPEN = 2 # open(path, flags)
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CLOSE = 3 # close(fd)
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STAT = 4 # stat(path, info)（结构体仍是本系统的 fileinfo）
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SEEK = 8 # lseek(fd, offset, whence)（whence 目前恒 0 = SEEK_SET）
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MMAP = 9 # mmap(size) → VA（ABI 待向 Linux 的 addr/len/prot/flags/fd/off 靠拢）
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MUNMAP = 11 # munmap(ptr, size)（目前空实现）
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IOCTL = 16 # ioctl(fd, request, arg)：设备控制（当前用于 /dev/fb0 查几何）
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YIELD = 24 # sched_yield()
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THREAD_CREATE = 56 # clone()：建用户线程，返回 tid
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SPAWN = 59 # execve()：加载并运行新 ELF，返回 pid
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THREAD_EXIT = 60 # exit()：退役当前线程
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MKDIR = 83 # mkdir(path)
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REMOVE = 87 # unlink(path)
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EXIT = 231 # exit_group()：退役当前线程 + 拆掉本 pid 的窗口
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# ---- 临时私有段（0x1000+）：Linux 无对应，且**逐条都会被消掉** ----
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# 目标形态：私有能力不占 syscall 号 → 改 devfs 设备文件；UI 11 个 → 由用户态
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# explorer（图形壳）接管 framebuffer 与输入后删除。当前保留只为让现有 app 还能跑。
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SERIAL_PUTS = 0x1000 # TODO(devfs)：改为 write(/dev/serial0)
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TELL = 0x1001 # TODO(linux)：可由 lseek(fd, 0, SEEK_CUR) 表达
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SIZE = 0x1002 # TODO(linux)：可由 fstat 表达
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OPENDIR = 0x1003 # TODO(linux)：openat(O_DIRECTORY) + getdents64
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READDIR = 0x1004 # TODO(linux)：getdents64
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CLOSEDIR = 0x1005 # TODO(linux)：close
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LOAD_SO = 0x1006 # TODO(用户层)：动态库加载下沉
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SO_CALL1 = 0x1007 # TODO(用户层)：同上
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WAIT_WINDOW = 0x1008 # TODO(explorer)：UI
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CREATE_WINDOW = 0x1009 # TODO(explorer)：UI
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DRAW_TEXT = 0x100A # TODO(explorer)：UI
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GET_WINBUF = 0x100B # TODO(explorer)：UI
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WIN_FLUSH = 0x100C # TODO(explorer)：UI
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POLL_EVENT = 0x100D # TODO(explorer)：UI
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SET_CURSOR = 0x100E # TODO(explorer)：UI
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SET_TITLE = 0x100F # TODO(explorer)：UI
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SET_GEOMETRY = 0x1010 # TODO(explorer)：UI
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SET_RESIZABLE = 0x1011 # TODO(explorer)：UI
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GET_WIN_SIZE = 0x1012 # TODO(explorer)：UI
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# ---- mmap 的 prot / flags（与内核 VKernel/intr/syscall.vp 及各 Linux 同名常量一致）----
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define PROT_NONE = 0x0
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define PROT_READ = 0x1
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define PROT_WRITE = 0x2
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define PROT_EXEC = 0x4
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define MAP_SHARED = 0x01
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define MAP_PRIVATE = 0x02
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define MAP_FIXED = 0x10
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define MAP_ANONYMOUS = 0x20
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# fd = -1（Linux 匿名映射约定）
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define MMAP_FD_ANON: uint64 = 0xFFFFFFFFFFFFFFFF
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def _syscall0(num: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11])
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return ret
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def _syscall1(num: uint64, a1: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rdi, {asminp(a1, ASM_DESCR.REG_ANY)}
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mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11, ASM_DESCR.CLOBBER_RDI])
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return ret
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def _syscall2(num: uint64, a1: uint64, a2: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rdi, {asminp(a1, ASM_DESCR.REG_ANY)}
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mov rsi, {asminp(a2, ASM_DESCR.REG_ANY)}
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mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11, ASM_DESCR.CLOBBER_RDI,
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ASM_DESCR.CLOBBER_RSI])
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return ret
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def _syscall3(num: uint64, a1: uint64, a2: uint64, a3: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rdi, {asminp(a1, ASM_DESCR.REG_ANY)}
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mov rsi, {asminp(a2, ASM_DESCR.REG_ANY)}
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mov rdx, {asminp(a3, ASM_DESCR.REG_ANY)}
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mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11, ASM_DESCR.CLOBBER_RDI,
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ASM_DESCR.CLOBBER_RSI, ASM_DESCR.CLOBBER_RDX])
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return ret
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def _syscall5(num: uint64, a1: uint64, a2: uint64, a3: uint64, a4: uint64, a5: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rdi, {asminp(a1, ASM_DESCR.REG_ANY)}
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mov rsi, {asminp(a2, ASM_DESCR.REG_ANY)}
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mov rdx, {asminp(a3, ASM_DESCR.REG_ANY)}
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mov r10, {asminp(a4, ASM_DESCR.REG_ANY)}
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mov r8, {asminp(a5, ASM_DESCR.REG_ANY)}
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mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11, ASM_DESCR.CLOBBER_RDI,
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ASM_DESCR.CLOBBER_RSI, ASM_DESCR.CLOBBER_RDX,
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ASM_DESCR.CLOBBER_R10, ASM_DESCR.CLOBBER_R8])
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return ret
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def _syscall6(num: uint64, a1: uint64, a2: uint64, a3: uint64, a4: uint64, a5: uint64, a6: uint64) -> uint64:
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ret: uint64
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__asm__(f"""mov rdi, {asminp(a1, ASM_DESCR.REG_ANY)}
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mov rsi, {asminp(a2, ASM_DESCR.REG_ANY)}
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mov rdx, {asminp(a3, ASM_DESCR.REG_ANY)}
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mov r10, {asminp(a4, ASM_DESCR.REG_ANY)}
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mov r8, {asminp(a5, ASM_DESCR.REG_ANY)}
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mov r9, {asminp(a6, ASM_DESCR.REG_ANY)}
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mov rax, {asminp(num, ASM_DESCR.REG_ANY)}
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syscall""",
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out=[asmout(ret, ASM_DESCR.OUTPUT_REG)],
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op=[ASM_DESCR.CLOBBER_MEMORY, ASM_DESCR.CLOBBER_RCX,
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ASM_DESCR.CLOBBER_R11, ASM_DESCR.CLOBBER_RDI,
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ASM_DESCR.CLOBBER_RSI, ASM_DESCR.CLOBBER_RDX,
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ASM_DESCR.CLOBBER_R10, ASM_DESCR.CLOBBER_R8,
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ASM_DESCR.CLOBBER_R9])
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return ret
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def mmap(addr: uint64, length: uint64, prot: uint64, flags: uint64, fd: uint64, offset: uint64) -> uint64:
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"""mmap(addr, length, prot, flags, fd, offset)：返回映射起始 VA，失败返回 0。
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匿名映射：fd = MMAP_FD_ANON(-1) 且 flags 带 MAP_ANONYMOUS；
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映射设备（如 /dev/fb0）：fd 传该设备的 fd。addr / MAP_FIXED 由内核挑地址。
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（定义放在 _syscall6 之后，避免同模块内前向引用。）
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"""
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return _syscall6(uint64(Syscall.MMAP), addr, length, prot, flags, fd, offset)
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