refactor syscall code
This commit is contained in:
rsc
parent
31085bb416
commit
224f6598c1
6 changed files with 198 additions and 248 deletions
11
defs.h
11
defs.h
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@ -16,7 +16,7 @@ struct jmpbuf;
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void setupsegs(struct proc*);
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struct proc* copyproc(struct proc*);
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struct spinlock;
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uint growproc(int);
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int growproc(int);
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void sleep(void*, struct spinlock*);
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void wakeup(void*);
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void scheduler(void);
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@ -43,10 +43,10 @@ int strncmp(const char*, const char*, uint);
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// syscall.c
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void syscall(void);
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int fetchint(struct proc*, uint, int*);
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int fetchbyte(struct proc*, uint, char*);
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int fetcharg(int, void*);
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int checkstring(uint);
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int putint(struct proc*, uint, int);
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int fetchstr(struct proc*, uint, char**);
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int argint(int, int*);
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int argptr(int, char**, int);
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int argstr(int, char**);
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// picirq.c
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extern ushort irq_mask_8259A;
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@ -99,7 +99,6 @@ int pipe_read(struct pipe*, char*, int);
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// file.c
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struct stat;
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void fileinit(void);
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int fdalloc(void);
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struct file* filealloc(void);
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void fileclose(struct file*);
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int fileread(struct file*, char*, int n);
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14
file.c
14
file.c
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@ -22,19 +22,7 @@ fileinit(void)
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initlock(&fd_table_lock, "fd_table");
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}
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// Allocate a file descriptor number for curproc.
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int
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fdalloc(void)
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{
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int fd;
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struct proc *p = curproc[cpu()];
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for(fd = 0; fd < NOFILE; fd++)
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if(p->ofile[fd] == 0)
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return fd;
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return -1;
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}
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// Allocate a file descriptor structure
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// Allocate a file structure
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struct file*
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filealloc(void)
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{
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77
syscall.c
77
syscall.c
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@ -21,66 +21,73 @@
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// library system call function. The saved user %esp points
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// to a saved program counter, and then the first argument.
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// Fetch 32 bits from a user-supplied pointer.
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// Returns 0 if addr was OK, -1 if illegal.
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// Fetch the int at addr from process p.
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int
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fetchint(struct proc *p, uint addr, int *ip)
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{
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*ip = 0;
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if(addr > p->sz - 4)
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if(addr >= p->sz || addr+4 > p->sz)
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return -1;
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*ip = *(int*)(p->mem + addr);
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return 0;
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}
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// Fetch byte from a user-supplied pointer.
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// Returns 0 on success, -1 if pointer is illegal.
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// Fetch the nul-terminated string at addr from process p.
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// Doesn't actually copy the string - just sets *pp to point at it.
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// Returns length of string, not including nul.
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int
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fetchbyte(struct proc *p, uint addr, char *c)
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fetchstr(struct proc *p, uint addr, char **pp)
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{
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char *cp, *ep;
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if(addr >= p->sz)
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return -1;
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*c = *(p->mem + addr);
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return 0;
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*pp = p->mem + addr;
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ep = p->mem + p->sz;
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for(cp = *pp; cp < ep; cp++)
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if(*cp == 0)
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return cp - *pp;
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return -1;
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}
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// Fetch the argno'th word-sized system call argument as an integer.
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int
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fetcharg(int argno, void *ip)
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argint(int argno, int *ip)
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{
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uint esp;
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struct proc *p = curproc[cpu()];
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esp = (uint) curproc[cpu()]->tf->esp;
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return fetchint(curproc[cpu()], esp + 4 + 4*argno, ip);
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return fetchint(p, p->tf->esp + 4 + 4*argno, ip);
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}
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// Check that an entire string is valid in user space.
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// Returns the length, not including null, or -1.
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// Fetch the nth word-sized system call argument as a pointer
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// to a block of memory of size n bytes. Check that the pointer
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// lies within the process address space.
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int
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checkstring(uint s)
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argptr(int argno, char **pp, int size)
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{
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char c;
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int len = 0;
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for(;;){
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if(fetchbyte(curproc[cpu()], s, &c) < 0)
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return -1;
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if(c == '\0')
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return len;
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len++;
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s++;
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}
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}
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int
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putint(struct proc *p, uint addr, int x)
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{
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if(addr > p->sz - 4)
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int i;
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struct proc *p = curproc[cpu()];
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if(argint(argno, &i) < 0)
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return -1;
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memmove(p->mem + addr, &x, 4);
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if((uint)i >= p->sz || (uint)i+size >= p->sz)
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return -1;
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*pp = p->mem + i;
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return 0;
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}
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// Fetch the nth word-sized system call argument as a string pointer.
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// Check that the pointer is valid and the string is nul-terminated.
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// (There is no shared writable memory, so the string can't change
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// between this check and being used by the kernel.)
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int
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argstr(int argno, char **pp)
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{
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int addr;
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if(argint(argno, &addr) < 0)
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return -1;
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return fetchstr(curproc[cpu()], addr, pp);
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}
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extern int sys_chdir(void);
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extern int sys_close(void);
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extern int sys_dup(void);
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@ -1,3 +1,4 @@
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// System call numbers
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#define SYS_fork 1
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#define SYS_exit 2
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#define SYS_wait 3
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332
sysfile.c
332
sysfile.c
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@ -15,120 +15,117 @@
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#include "file.h"
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#include "fcntl.h"
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// Fetch the nth word-sized system call argument as a file descriptor
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// and return both the descriptor and the corresponding struct file.
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static int
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argfd(int argno, int *pfd, struct file **pf)
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{
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int fd;
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struct file *f;
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struct proc *p = curproc[cpu()];
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if(argint(argno, &fd) < 0)
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return -1;
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if(fd < 0 || fd >= NOFILE || (f=p->ofile[fd]) == 0)
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return -1;
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if(pfd)
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*pfd = fd;
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if(pf)
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*pf = f;
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return 0;
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}
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// Allocate a file descriptor for the given file.
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// Takes over file reference from caller on success.
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static int
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fdalloc(struct file *f)
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{
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int fd;
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struct proc *p = curproc[cpu()];
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for(fd = 0; fd < NOFILE; fd++){
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if(p->ofile[fd] == 0){
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p->ofile[fd] = f;
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return fd;
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}
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}
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return -1;
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}
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int
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sys_pipe(void)
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{
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struct file *rfd = 0, *wfd = 0;
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int f1 = -1, f2 = -1;
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int *fd;
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struct file *rf = 0, *wf = 0;
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int fd0, fd1;
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struct proc *p = curproc[cpu()];
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uint fdp;
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if(pipe_alloc(&rfd, &wfd) < 0)
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goto oops;
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if((f1 = fdalloc()) < 0)
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goto oops;
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p->ofile[f1] = rfd;
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if((f2 = fdalloc()) < 0)
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goto oops;
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p->ofile[f2] = wfd;
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if(fetcharg(0, &fdp) < 0)
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goto oops;
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if(putint(p, fdp, f1) < 0)
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goto oops;
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if(putint(p, fdp+4, f2) < 0)
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goto oops;
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if(argptr(0, (void*)&fd, 2*sizeof fd[0]) < 0)
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return -1;
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if(pipe_alloc(&rf, &wf) < 0)
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return -1;
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fd0 = -1;
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if((fd0 = fdalloc(rf)) < 0 || (fd1 = fdalloc(wf)) < 0){
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if(fd0 >= 0)
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p->ofile[fd0] = 0;
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fileclose(rf);
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fileclose(wf);
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return -1;
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}
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return 0;
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oops:
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if(rfd)
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fileclose(rfd);
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if(wfd)
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fileclose(wfd);
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if(f1 >= 0)
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p->ofile[f1] = 0;
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if(f2 >= 0)
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p->ofile[f2] = 0;
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return -1;
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}
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int
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sys_write(void)
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{
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int fd, n, ret;
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uint addr;
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struct proc *p = curproc[cpu()];
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struct file *f;
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int n;
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char *cp;
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if(fetcharg(0, &fd) < 0 ||
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fetcharg(1, &addr) < 0 ||
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fetcharg(2, &n) < 0)
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if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &cp, n) < 0)
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return -1;
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if(fd < 0 || fd >= NOFILE)
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return -1;
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if(p->ofile[fd] == 0)
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return -1;
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if(addr + n > p->sz)
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return -1;
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ret = filewrite(p->ofile[fd], p->mem + addr, n);
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return ret;
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return filewrite(f, cp, n);
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}
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int
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sys_read(void)
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{
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int fd, n, ret;
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uint addr;
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struct proc *p = curproc[cpu()];
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struct file *f;
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int n;
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char *cp;
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if(fetcharg(0, &fd) < 0 ||
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fetcharg(1, &addr) < 0 ||
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fetcharg(2, &n) < 0)
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if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &cp, n) < 0)
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return -1;
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if(fd < 0 || fd >= NOFILE)
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return -1;
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if(p->ofile[fd] == 0)
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return -1;
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if(addr + n > p->sz)
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return -1;
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ret = fileread(p->ofile[fd], p->mem + addr, n);
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return ret;
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return fileread(f, cp, n);
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}
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int
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sys_close(void)
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{
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int fd;
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struct proc *p = curproc[cpu()];
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if(fetcharg(0, &fd) < 0)
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struct file *f;
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if(argfd(0, &fd, &f) < 0)
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return -1;
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if(fd < 0 || fd >= NOFILE)
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return -1;
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if(p->ofile[fd] == 0)
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return -1;
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fileclose(p->ofile[fd]);
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p->ofile[fd] = 0;
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curproc[cpu()]->ofile[fd] = 0;
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fileclose(f);
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return 0;
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}
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int
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sys_open(void)
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{
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struct proc *cp = curproc[cpu()];
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struct inode *ip, *dp;
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uint arg0, arg1;
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int ufd;
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struct file *fd;
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int l;
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char *path;
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int omode;
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int fd;
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struct file *f;
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char *last;
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if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0)
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return -1;
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if((l = checkstring(arg0)) < 0)
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if(argstr(0, &path) < 0 || argint(1, &omode) < 0)
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return -1;
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if(arg1 & O_CREATE){
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dp = namei(cp->mem + arg0, NAMEI_CREATE, 0, &last, &ip);
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if(omode & O_CREATE){
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dp = namei(path, NAMEI_CREATE, 0, &last, &ip);
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if(dp){
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ip = mknod1(dp, last, T_FILE, 0, 0);
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iput(dp);
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@ -141,86 +138,77 @@ sys_open(void)
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return -1;
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}
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} else {
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ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
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ip = namei(path, NAMEI_LOOKUP, 0, 0, 0);
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if(ip == 0)
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return -1;
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}
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if(ip->type == T_DIR && ((arg1 & O_RDWR) || (arg1 & O_WRONLY))){
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if(ip->type == T_DIR && ((omode & O_RDWR) || (omode & O_WRONLY))){
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iput(ip);
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return -1;
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}
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if((fd = filealloc()) == 0){
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if((f = filealloc()) == 0){
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iput(ip);
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return -1;
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}
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if((ufd = fdalloc()) < 0){
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if((fd = fdalloc(f)) < 0){
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iput(ip);
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fileclose(fd);
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fileclose(f);
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return -1;
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}
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iunlock(ip);
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fd->type = FD_FILE;
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if(arg1 & O_RDWR) {
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fd->readable = 1;
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fd->writable = 1;
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} else if(arg1 & O_WRONLY) {
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fd->readable = 0;
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fd->writable = 1;
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f->type = FD_FILE;
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if(omode & O_RDWR) {
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f->readable = 1;
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f->writable = 1;
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} else if(omode & O_WRONLY) {
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f->readable = 0;
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f->writable = 1;
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} else {
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fd->readable = 1;
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fd->writable = 0;
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f->readable = 1;
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f->writable = 0;
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}
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fd->ip = ip;
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fd->off = 0;
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cp->ofile[ufd] = fd;
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f->ip = ip;
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f->off = 0;
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return ufd;
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return fd;
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}
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int
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sys_mknod(void)
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{
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struct proc *cp = curproc[cpu()];
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struct inode *nip;
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uint arg0, arg1, arg2, arg3;
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int l;
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if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0 ||
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fetcharg(2, &arg2) < 0 || fetcharg(3, &arg3) < 0)
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char *path;
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int len;
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int type, major, minor;
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if((len=argstr(0, &path)) < 0 || argint(1, &type) < 0 ||
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argint(2, &major) < 0 || argint(3, &minor) < 0)
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return -1;
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if((l = checkstring(arg0)) < 0)
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if(len >= DIRSIZ)
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return -1;
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if(l >= DIRSIZ)
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if((nip = mknod(path, type, major, minor)) == 0)
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return -1;
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nip = mknod(cp->mem + arg0, (short) arg1, (short) arg2, (short) arg3);
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if(nip)
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iput(nip);
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return (nip == 0) ? -1 : 0;
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iput(nip);
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return 0;
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}
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int
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sys_mkdir(void)
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{
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struct proc *cp = curproc[cpu()];
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struct inode *nip;
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struct inode *dp;
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uint arg0;
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int l;
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char *path;
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struct dirent de;
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char *last;
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if(fetcharg(0, &arg0) < 0)
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if(argstr(0, &path) < 0)
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return -1;
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if((l = checkstring(arg0)) < 0)
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return -1;
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dp = namei(cp->mem + arg0, NAMEI_CREATE, 0, &last, 0);
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dp = namei(path, NAMEI_CREATE, 0, &last, 0);
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if(dp == 0)
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return -1;
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|
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@ -248,25 +236,20 @@ sys_mkdir(void)
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return 0;
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}
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int
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sys_chdir(void)
|
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{
|
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struct proc *cp = curproc[cpu()];
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struct proc *p = curproc[cpu()];
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struct inode *ip;
|
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uint arg0;
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int l;
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char *path;
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|
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if(fetcharg(0, &arg0) < 0)
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if(argstr(0, &path) < 0)
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return -1;
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|
||||
if((l = checkstring(arg0)) < 0)
|
||||
if((ip = namei(path, NAMEI_LOOKUP, 0, 0, 0)) == 0)
|
||||
return -1;
|
||||
|
||||
if((ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0)) == 0)
|
||||
return -1;
|
||||
|
||||
if(ip == cp->cwd) {
|
||||
if(ip == p->cwd) {
|
||||
iput(ip);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -276,100 +259,74 @@ sys_chdir(void)
|
|||
return -1;
|
||||
}
|
||||
|
||||
idecref(cp->cwd);
|
||||
cp->cwd = ip;
|
||||
iunlock(cp->cwd);
|
||||
idecref(p->cwd);
|
||||
p->cwd = ip;
|
||||
iunlock(p->cwd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
sys_unlink(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint arg0;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
char *path;
|
||||
|
||||
if(argstr(0, &path) < 0)
|
||||
return -1;
|
||||
if(checkstring(arg0) < 0)
|
||||
return -1;
|
||||
r = unlink(cp->mem + arg0);
|
||||
return r;
|
||||
return unlink(path);
|
||||
}
|
||||
|
||||
int
|
||||
sys_fstat(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint fd, addr;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &fd) < 0)
|
||||
struct file *f;
|
||||
struct stat *st;
|
||||
|
||||
if(argfd(0, 0, &f) < 0 || argptr(1, (void*)&st, sizeof *st) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &addr) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
return -1;
|
||||
if(cp->ofile[fd] == 0)
|
||||
return -1;
|
||||
if(addr + sizeof(struct stat) > cp->sz)
|
||||
return -1;
|
||||
r = filestat(cp->ofile[fd], (struct stat*)(cp->mem + addr));
|
||||
return r;
|
||||
return filestat(f, st);
|
||||
}
|
||||
|
||||
int
|
||||
sys_dup(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint fd, ufd1;
|
||||
|
||||
if(fetcharg(0, &fd) < 0)
|
||||
struct file *f;
|
||||
int fd;
|
||||
|
||||
if(argfd(0, 0, &f) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
if((fd=fdalloc(f)) < 0)
|
||||
return -1;
|
||||
if(cp->ofile[fd] == 0)
|
||||
return -1;
|
||||
if((ufd1 = fdalloc()) < 0)
|
||||
return -1;
|
||||
cp->ofile[ufd1] = cp->ofile[fd];
|
||||
fileincref(cp->ofile[ufd1]);
|
||||
return ufd1;
|
||||
fileincref(f);
|
||||
return fd;
|
||||
}
|
||||
|
||||
int
|
||||
sys_link(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint name1, name2;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &name1) < 0 || checkstring(name1) < 0)
|
||||
char *old, *new;
|
||||
|
||||
if(argstr(0, &old) < 0 || argstr(1, &new) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &name2) < 0 || checkstring(name2) < 0)
|
||||
return -1;
|
||||
r = link(cp->mem + name1, cp->mem + name2);
|
||||
return r;
|
||||
return link(old, new);
|
||||
}
|
||||
|
||||
int
|
||||
sys_exec(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint arg0, arg1, sz=0, ap, sp, p1, p2;
|
||||
uint sz=0, ap, sp, p1, p2;
|
||||
int i, nargs, argbytes, len;
|
||||
struct inode *ip;
|
||||
struct elfhdr elf;
|
||||
struct proghdr ph;
|
||||
char *mem = 0;
|
||||
char *path, *s;
|
||||
uint argv;
|
||||
|
||||
if(argstr(0, &path) < 0 || argint(1, (int*)&argv) < 0)
|
||||
return -1;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &arg1) < 0)
|
||||
return -1;
|
||||
if(checkstring(arg0) < 0)
|
||||
return -1;
|
||||
ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
|
||||
ip = namei(path, NAMEI_LOOKUP, 0, 0, 0);
|
||||
if(ip == 0)
|
||||
return -1;
|
||||
|
||||
|
|
@ -399,15 +356,14 @@ sys_exec(void)
|
|||
goto bad;
|
||||
memset(mem, 0, sz);
|
||||
|
||||
// arg1 is a pointer to an array of pointers to string.
|
||||
nargs = 0;
|
||||
argbytes = 0;
|
||||
for(i = 0; ; i++){
|
||||
if(fetchint(cp, arg1 + 4*i, &ap) < 0)
|
||||
for(i = 0;; i++){
|
||||
if(fetchint(cp, argv + 4*i, (int*)&ap) < 0)
|
||||
goto bad;
|
||||
if(ap == 0)
|
||||
break;
|
||||
len = checkstring(ap);
|
||||
len = fetchstr(cp, ap, &s);
|
||||
if(len < 0)
|
||||
goto bad;
|
||||
nargs++;
|
||||
|
|
@ -432,9 +388,9 @@ sys_exec(void)
|
|||
p1 = sp + 12;
|
||||
p2 = sp + 12 + (nargs + 1) * 4;
|
||||
for(i = 0; i < nargs; i++){
|
||||
fetchint(cp, arg1 + 4*i, &ap);
|
||||
len = checkstring(ap);
|
||||
memmove(mem + p2, cp->mem + ap, len + 1);
|
||||
fetchint(cp, argv + 4*i, (int*)&ap);
|
||||
len = fetchstr(cp, ap, &s);
|
||||
memmove(mem + p2, s, len + 1);
|
||||
*(uint*)(mem + p1) = p2;
|
||||
p1 += 4;
|
||||
p2 += len + 1;
|
||||
|
|
|
|||
11
sysproc.c
11
sysproc.c
|
|
@ -44,7 +44,7 @@ sys_kill(void)
|
|||
{
|
||||
int pid;
|
||||
|
||||
if(fetcharg(0, &pid) < 0)
|
||||
if(argint(0, &pid) < 0)
|
||||
return -1;
|
||||
return proc_kill(pid);
|
||||
}
|
||||
|
|
@ -52,20 +52,19 @@ sys_kill(void)
|
|||
int
|
||||
sys_getpid(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
return cp->pid;
|
||||
return curproc[cpu()]->pid;
|
||||
}
|
||||
|
||||
int
|
||||
sys_sbrk(void)
|
||||
{
|
||||
uint addr;
|
||||
int addr;
|
||||
int n;
|
||||
struct proc *cp = curproc[cpu()];
|
||||
|
||||
if(fetcharg(0, &n) < 0)
|
||||
if(argint(0, &n) < 0)
|
||||
return -1;
|
||||
if((addr = growproc(n)) == 0xffffffff)
|
||||
if((addr = growproc(n)) < 0)
|
||||
return -1;
|
||||
setupsegs(cp);
|
||||
return addr;
|
||||
|
|
|
|||
Loading…
Reference in a new issue