> compile NEMU

221220000 张三
Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
 12:26:49 up 6 days, 21:24,  1 user,  load average: 0.72, 0.73, 0.62

nanos-lite/Makefile

@@ -1,4 +1,4 @@
-#HAS_NAVY = 1
+HAS_NAVY = 1
 RAMDISK_FILE = build/ramdisk.img
 
 NAME = nanos-lite

nanos-lite/include/fs.h

@@ -7,4 +7,10 @@
 enum {SEEK_SET, SEEK_CUR, SEEK_END};
 #endif
 
+int _fs_open(const char *pathname, int flags, int mode);
+size_t _fs_read(int fd, void *buf, size_t len);
+size_t _fs_write(int fd, const void *buf, size_t len);
+size_t _fs_lseek(int fd, size_t offset, int whence);
+int _fs_close(int fd);
+
 #endif

nanos-lite/include/ramdisk.h

@@ -0,0 +1,15 @@
+#ifndef __RAMDISK_H__
+#define __RAMDISK_H__
+
+#include <common.h>
+
+size_t ramdisk_read(void *buf, size_t offset, size_t len);
+
+/* write `len` bytes starting from `buf` into the `offset` of ramdisk */
+size_t ramdisk_write(const void *buf, size_t offset, size_t len);
+
+void init_ramdisk();
+
+size_t get_ramdisk_size();
+
+#endif

nanos-lite/include/syscall.h

@@ -0,0 +1,41 @@
+#ifndef __NANOS_SYSCALL_H__
+#define __NANOS_SYSCALL_H__
+
+#define SYSCALLS(_) \
+  _(exit)           \
+  _(yield)          \
+  _(open)           \
+  _(read)           \
+  _(write)          \
+  _(kill)           \
+  _(getpid)         \
+  _(close)          \
+  _(lseek)          \
+  _(brk)            \
+  _(fstat)          \
+  _(time)           \
+  _(signal)         \
+  _(execve)         \
+  _(fork)           \
+  _(link)           \
+  _(unlink)         \
+  _(wait)           \
+  _(times)          \
+  _(gettimeofday)
+
+#define _SYSCALL_NAME(name) SYS_##name
+#define SYSCALL_NAME(name) _SYSCALL_NAME(name),
+#define SYSCALL_NAME_STR(name) #name,
+
+#ifndef __SYSCALL_H__
+#define __SYSCALL_H__
+enum {
+  SYSCALLS(SYSCALL_NAME)
+};
+#endif
+
+const char __syscall_names[][32] = {
+  SYSCALLS(SYSCALL_NAME_STR)
+};
+
+#endif

nanos-lite/src/fs.c

@@ -1,4 +1,5 @@
 #include <fs.h>
+#include <ramdisk.h>
 
 typedef size_t (*ReadFn) (void *buf, size_t offset, size_t len);
 typedef size_t (*WriteFn) (const void *buf, size_t offset, size_t len);
@@ -9,6 +10,7 @@ typedef struct {
   size_t disk_offset;
   ReadFn read;
   WriteFn write;
+  size_t open_offset;
 } Finfo;
 
 enum {FD_STDIN, FD_STDOUT, FD_STDERR, FD_FB};
@@ -23,14 +25,89 @@ size_t invalid_write(const void *buf, size_t offset, size_t len) {
   return 0;
 }
 
+size_t _write(const void *buf, size_t offset, size_t count) {
+  for (size_t i = 0; i < count; i++) {
+    putch(((const char*)buf)[i]);
+  }
+  return count;
+}
+
 /* This is the information about all files in disk. */
 static Finfo file_table[] __attribute__((used)) = {
   [FD_STDIN]  = {"stdin", 0, 0, invalid_read, invalid_write},
-  [FD_STDOUT] = {"stdout", 0, 0, invalid_read, invalid_write},
-  [FD_STDERR] = {"stderr", 0, 0, invalid_read, invalid_write},
+  [FD_STDOUT] = {"stdout", 0, 0, invalid_read, _write},
+  [FD_STDERR] = {"stderr", 0, 0, invalid_read, _write},
 #include "files.h"
 };
 
+int _fs_open(const char *pathname, int flags, int mode) {
+  int fd;
+  for (fd = 0; fd < LENGTH(file_table); fd ++) {
+    if (strcmp(file_table[fd].name, pathname) == 0) {
+      file_table[fd].open_offset = 0;
+      return fd;
+    }
+  }
+  panic_all_on(0, "No such file or directory");
+  return -1;
+}
+
+size_t _fs_read(int fd, void *buf, size_t len) {
+  assert(fd >= 0 && fd < LENGTH(file_table));
+  if (file_table[fd].read != NULL) {
+    return file_table[fd].read(buf, file_table[fd].open_offset, len);
+  }
+  
+  if (file_table[fd].size < file_table[fd].open_offset + len) {
+    return -1;
+  }
+  size_t ret = ramdisk_read(buf, file_table[fd].disk_offset + file_table[fd].open_offset, len);
+  file_table[fd].open_offset += ret;
+  return ret;
+}
+
+size_t _fs_write(int fd, const void *buf, size_t len) {
+  assert(fd >= 0 && fd < LENGTH(file_table));
+  if (file_table[fd].write != NULL) {
+    return file_table[fd].write(buf, file_table[fd].open_offset, len);
+  }
+  
+  if (file_table[fd].size < file_table[fd].open_offset + len) {
+    return -1;
+  }
+  size_t ret = ramdisk_write(buf, file_table[fd].disk_offset + file_table[fd].open_offset, len);
+  file_table[fd].open_offset += ret;
+  return ret;
+}
+
+size_t _fs_lseek(int fd, size_t offset, int whence) {
+  assert(fd >= 0 && fd < LENGTH(file_table));
+  switch (whence)
+  {
+  case SEEK_CUR:
+    file_table[fd].open_offset += offset;
+    break;
+  case SEEK_END:
+    file_table[fd].open_offset = file_table[fd].size - offset;
+    break;
+  case SEEK_SET:
+    file_table[fd].open_offset = offset;
+    break;
+  default:
+    break;
+  }
+  if (file_table[fd].open_offset < file_table[fd].size) {
+    return -1;
+  }
+  return file_table[fd].open_offset;
+}
+
+int _fs_close(int fd) {
+  assert(fd >= 0 && fd < LENGTH(file_table));
+  return 0;
+}
+
+
 void init_fs() {
   // TODO: initialize the size of /dev/fb
 }

nanos-lite/src/loader.c

@@ -1,5 +1,6 @@
 #include <proc.h>
 #include <elf.h>
+#include <fs.h>
 
 #ifdef __LP64__
 # define Elf_Ehdr Elf64_Ehdr
@@ -14,22 +15,25 @@ static uintptr_t loader(PCB *pcb, const char *filename) {
   Elf_Ehdr ehdr;
   size_t ret;
 
-  size_t ramdisk_read(void *buf, size_t offset, size_t len);  
-  ret = ramdisk_read(&ehdr, 0, sizeof(ehdr));
+  int fd = _fs_open(filename, 0, 0);
+  assert(fd != -1);
+  ret = _fs_read(fd, &ehdr, sizeof(ehdr));
   assert(ret == sizeof(ehdr));
   assert(ehdr.e_ident[0] == 0x7f && ehdr.e_ident[1] == 'E' && ehdr.e_ident[2] == 'L' && ehdr.e_ident[3] == 'F');
   // assert(memcpy(ehdr.e_ident, ELFMAG, SELFMAG) == 0);
   // assert(*(uint32_t *)ehdr.e_ident == 0x7f454746);
 
   Elf_Phdr phdr[ehdr.e_phnum];
-  ret = ramdisk_read(phdr, ehdr.e_phoff, sizeof(phdr));
+  assert(_fs_lseek(fd, ehdr.e_phoff, SEEK_SET) != -1);
+  ret = _fs_read(fd, phdr, sizeof(phdr));
   assert(ret == ehdr.e_phentsize * ehdr.e_phnum);
 
   for (int i = 0; i < ehdr.e_phnum; i ++) {
     if (phdr[i].p_type != PT_LOAD) {
       continue;
     }
-    ret = ramdisk_read((void*)phdr[i].p_vaddr, phdr[i].p_offset, phdr[i].p_filesz);
+    assert(_fs_lseek(fd, phdr[i].p_offset, SEEK_SET) != -1);
+    ret = _fs_read(fd, (void*)phdr[i].p_vaddr, phdr[i].p_filesz);
     assert(ret == phdr[i].p_filesz);
     memset((uint8_t*)phdr[i].p_vaddr + phdr[i].p_filesz, 0, phdr[i].p_memsz - phdr[i].p_filesz);
   }

nanos-lite/src/proc.c

@@ -26,7 +26,7 @@ void init_proc() {
 
   // load program here
   void naive_uload(PCB *pcb, const char *filename);
-  naive_uload(NULL, NULL);
+  naive_uload(NULL, "/bin/hello");
 
 }
 

nanos-lite/src/syscall.c

@@ -1,15 +1,6 @@
 #include <common.h>
-#include "syscall.h"
-
-size_t _write(int fd, const void *buf, size_t count) {
-  if ((fd != 1 && fd != 2) || buf == NULL || count == 0) {
-    return -1;
-  }
-  for (size_t i = 0; i < count; i++) {
-    putch(((const char*)buf)[i]);
-  }
-  return count;
-}
+#include <syscall.h>
+#include <fs.h>
 
 int _brk(void* addr) {
   return 0;
@@ -26,7 +17,13 @@ void do_syscall(Context *c) {
   TRACE("syscall %d: %s", a[0], __syscall_names[a[0]]);
   switch (a[0]) {
     CASE(yield, yield())
-    CASE(write, c->GPRx = _write((int)a[1], (const char*)a[2], (size_t)a[3]))
+    
+    CASE(open,  c->GPRx = _fs_open((const char*)a[1], (int)a[2], (int)a[3]))
+    CASE(read,  c->GPRx = _fs_read((int)a[1], (void*)a[2], (size_t)a[3]))
+    CASE(write, c->GPRx = _fs_write((int)a[1], (const char*)a[2], (size_t)a[3]))
+    CASE(lseek, c->GPRx = _fs_lseek((int)a[1], (size_t)a[2], (int)a[3]))
+    CASE(close, c->GPRx = _fs_close((int)a[1]))
+    
     CASE(brk, c->GPRx = _brk((void*)a[1]))
     CASE(exit, halt(0))
     default: panic("Unhandled syscall ID = %d", a[0]);

navy-apps/Makefile

@@ -136,7 +136,7 @@ $(ARCHIVE): $(OBJS) libs
 
 ### Pull newlib from github if it does not exist
 ifeq ($(wildcard $(NAVY_HOME)/libs/libc/Makefile),)
-  $(shell cd $(NAVY_HOME)/libs && git clone https://github.com/NJU-ProjectN/newlib-navy.git libc)
+  $(shell cd $(NAVY_HOME)/libs && git clone https://www.github.com/NJU-ProjectN/newlib-navy.git libc)
 endif
 
 ### Build order control
@@ -167,7 +167,7 @@ $(CLEAN_ALL):
 
 ### Build fsimg and ramdisk for Nanos-lite
 APPS =
-TESTS = dummy hello
+TESTS = dummy hello file-test
 
 fsimg: $(addprefix apps/, $(APPS)) $(addprefix tests/, $(TESTS))
 	-for t in $^; do $(MAKE) -s -C $(NAVY_HOME)/$$t install; done

navy-apps/libs/compiler-rt/Makefile

@@ -1,6 +1,6 @@
 REPO_PATH = repo
 ifeq ($(wildcard repo/LICENSE.TXT),)
-  $(shell git clone --depth=1 git@github.com:NJU-ProjectN/compiler-rt.git $(REPO_PATH))
+  $(shell git clone --depth=1 https://github.com/NJU-ProjectN/compiler-rt.git $(REPO_PATH))
 endif
 
 NAME = compiler-rt

navy-apps/libs/libos/src/syscall.c

@@ -62,8 +62,7 @@ void _exit(int status) {
 }
 
 int _open(const char *path, int flags, mode_t mode) {
-  _exit(SYS_open);
-  return 0;
+  return _syscall_(SYS_open, (intptr_t)path, flags, mode);
 }
 
 int _write(int fd, void *buf, size_t count) {
@@ -83,18 +82,15 @@ void *_sbrk(intptr_t increment) {
 }
 
 int _read(int fd, void *buf, size_t count) {
-  _exit(SYS_read);
-  return 0;
+  return _syscall_(SYS_read, fd, (intptr_t)buf, count);
 }
 
 int _close(int fd) {
-  _exit(SYS_close);
-  return 0;
+  return _syscall_(SYS_close, fd, 0, 0);
 }
 
 off_t _lseek(int fd, off_t offset, int whence) {
-  _exit(SYS_lseek);
-  return 0;
+  return _syscall_(SYS_lseek, fd, offset, whence);
 }
 
 int _gettimeofday(struct timeval *tv, struct timezone *tz) {