101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
#include "syscall.h"
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#include "keyboard.h"
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#include "klibc.h"
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#include "process.h"
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#include "stdarg.h"
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#include "thread.h"
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#include "types.h"
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#include "uaccess.h"
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#include "uaddrspace.h"
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#include "zero.h"
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int syscallExecute(int syscallId, const struct cpu_state *userCtx)
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{
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int ret = 0;
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switch (syscallId) {
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case SYSCALL_ID_EXIT: {
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uint status;
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ret = syscallGet1arg(userCtx, &status);
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if (ret != 0)
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break;
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threadExit();
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assert(0);
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break;
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}
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case SYSCALL_ID_HELO:
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ret = printf("HELLO FROM USERSPACE\n");
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break;
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case SYSCALL_ID_PUTC: {
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unsigned int c;
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ret = syscallGet1arg(userCtx, &c);
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putc(c);
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break;
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}
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case SYSCALL_ID_READ:
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ret = keyboardRead();
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break;
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case SYSCALL_ID_TEST: {
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unsigned int arg1, arg2, arg3, arg4, arg5;
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ret = syscallGet5args(userCtx, &arg1, &arg2, &arg3, &arg4, &arg5);
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printf("Got 5args from userspace %d %d %d %d %d\n", arg1, arg2, arg3, arg4, arg5);
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break;
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}
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case SYSCALL_ID_BRK:{
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struct uAddrSpace *as;
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uaddr_t newHeapTop;
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as = processGetAddrSpace(getCurrentThread()->process);
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ret = syscallGet1arg(userCtx, (unsigned int *)&newHeapTop);
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if (ret != 0)
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break;
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threadChangeCurrentContext(uAddrSpaceGetMMUContext(as));
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//TODO : what if *newHeapTop raise page fault?
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ret = sysBrk(as, newHeapTop);
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threadChangeCurrentContext(NULL);
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break;
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}
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case SYSCALL_ID_MMAP: {
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struct uAddrSpace *as;
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uaddr_t uaddr;
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uaddr_t uaddr_ptr;
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size_t size;
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uint32_t rights;
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uint32_t flags;
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uaddr_t userPath;
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char path[256];
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as = processGetAddrSpace(getCurrentThread()->process);
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ret = syscallGet5args(userCtx, (unsigned int *)&uaddr_ptr, (unsigned int *)&size, (unsigned int *)&rights,
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(unsigned int *)&flags, (unsigned int *)&userPath);
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if (memcpyFromUser((vaddr_t)&uaddr, uaddr_ptr, sizeof(uaddr)) != sizeof(uaddr)) {
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ret = -EFAULT;
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break;
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}
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strzcpyFromUser((vaddr_t *)path, (uaddr_t *)userPath, sizeof(path));
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printf("Trying mmap for device %s at %lu\n", path, (vaddr_t)uaddr);
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if(strcmp(path, "/dev/zero") == 0){
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ret = zeroMmap(as, &uaddr, size, rights,flags);
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}
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if(!ret){
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if(memcpyToUser(uaddr_ptr, (vaddr_t)&uaddr, sizeof(uaddr)) != sizeof(uaddr)){
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ret = -EFAULT;
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break;
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}
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}
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break;
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}
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default:
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printf("Unknon syscall id %d\n", syscallId);
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ret = -ENOENT;
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}
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return ret;
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}
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