From 5753553213df8f9de851adb68377db43faecb91f Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 11 Jun 2019 09:57:14 -0400
Subject: separate source into kernel/ user/ mkfs/

---
 exec.c | 149 -----------------------------------------------------------------
 1 file changed, 149 deletions(-)
 delete mode 100644 exec.c

(limited to 'exec.c')

diff --git a/exec.c b/exec.c
deleted file mode 100644
index c9af395..0000000
--- a/exec.c
+++ /dev/null
@@ -1,149 +0,0 @@
-#include "types.h"
-#include "param.h"
-#include "memlayout.h"
-#include "riscv.h"
-#include "proc.h"
-#include "defs.h"
-#include "elf.h"
-
-static int loadseg(pde_t *pgdir, uint64 addr, struct inode *ip, uint offset, uint sz);
-
-int
-exec(char *path, char **argv)
-{
-  char *s, *last;
-  int i, off;
-  uint64 argc, sz, sp, ustack[MAXARG+1], stackbase;
-  struct elfhdr elf;
-  struct inode *ip;
-  struct proghdr ph;
-  pagetable_t pagetable = 0, oldpagetable;
-  struct proc *p = myproc();
-  uint64 oldsz = p->sz;
-
-  begin_op();
-
-  if((ip = namei(path)) == 0){
-    end_op();
-    return -1;
-  }
-  ilock(ip);
-
-  // Check ELF header
-  if(readi(ip, 0, (uint64)&elf, 0, sizeof(elf)) != sizeof(elf))
-    goto bad;
-  if(elf.magic != ELF_MAGIC)
-    goto bad;
-
-  if((pagetable = proc_pagetable(p)) == 0)
-    goto bad;
-
-  // Load program into memory.
-  sz = 0;
-  for(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof(ph)){
-    if(readi(ip, 0, (uint64)&ph, off, sizeof(ph)) != sizeof(ph))
-      goto bad;
-    if(ph.type != ELF_PROG_LOAD)
-      continue;
-    if(ph.memsz < ph.filesz)
-      goto bad;
-    if(ph.vaddr + ph.memsz < ph.vaddr)
-      goto bad;
-    if((sz = uvmalloc(pagetable, sz, ph.vaddr + ph.memsz)) == 0)
-      goto bad;
-    if(ph.vaddr % PGSIZE != 0)
-      goto bad;
-    if(loadseg(pagetable, ph.vaddr, ip, ph.off, ph.filesz) < 0)
-      goto bad;
-  }
-  iunlockput(ip);
-  end_op();
-  ip = 0;
-
-  // Allocate two pages at the next page boundary.
-  // Use the second as the user stack.
-  sz = PGROUNDUP(sz);
-  if((sz = uvmalloc(pagetable, sz, sz + 2*PGSIZE)) == 0)
-    goto bad;
-  sp = sz;
-  stackbase = sp - PGSIZE;
-
-  // Push argument strings, prepare rest of stack in ustack.
-  for(argc = 0; argv[argc]; argc++) {
-    if(argc >= MAXARG)
-      goto bad;
-    sp -= strlen(argv[argc]) + 1;
-    sp -= sp % 16; // riscv sp must be 16-byte aligned
-    if(sp < stackbase)
-      goto bad;
-    if(copyout(pagetable, sp, argv[argc], strlen(argv[argc]) + 1) < 0)
-      goto bad;
-    ustack[argc] = sp;
-  }
-  ustack[argc] = 0;
-
-  // push the array of argv[] pointers.
-  sp -= (argc+1) * sizeof(uint64);
-  sp -= sp % 16;
-  if(sp < stackbase)
-    goto bad;
-  if(copyout(pagetable, sp, (char *)ustack, (argc+1)*sizeof(uint64)) < 0)
-    goto bad;
-
-  // arguments to user main(argc, argv)
-  // argc is returned via the system call return
-  // value, which goes in a0.
-  p->tf->a1 = sp;
-
-  // Save program name for debugging.
-  for(last=s=path; *s; s++)
-    if(*s == '/')
-      last = s+1;
-  safestrcpy(p->name, last, sizeof(p->name));
-    
-  // Commit to the user image.
-  oldpagetable = p->pagetable;
-  p->pagetable = pagetable;
-  p->sz = sz;
-  p->tf->epc = elf.entry;  // initial program counter = main
-  p->tf->sp = sp; // initial stack pointer
-  proc_freepagetable(oldpagetable, oldsz);
-  return argc; // this ends up in a0, the first argument to main(argc, argv)
-
- bad:
-  if(pagetable)
-    proc_freepagetable(pagetable, sz);
-  if(ip){
-    iunlockput(ip);
-    end_op();
-  }
-  return -1;
-}
-
-// Load a program segment into pagetable at virtual address va.
-// va must be page-aligned
-// and the pages from va to va+sz must already be mapped.
-// Returns 0 on success, -1 on failure.
-static int
-loadseg(pagetable_t pagetable, uint64 va, struct inode *ip, uint offset, uint sz)
-{
-  uint i, n;
-  uint64 pa;
-
-  if((va % PGSIZE) != 0)
-    panic("loadseg: va must be page aligned");
-
-  for(i = 0; i < sz; i += PGSIZE){
-    pa = walkaddr(pagetable, va + i);
-    if(pa == 0)
-      panic("loadseg: address should exist");
-    if(sz - i < PGSIZE)
-      n = sz - i;
-    else
-      n = PGSIZE;
-    if(readi(ip, 0, (uint64)pa, offset+i, n) != n)
-      return -1;
-  }
-  
-  return 0;
-}
-- 
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