Make elf proghdr fields match what objdump prints

bootmain.c

@@ -35,8 +35,8 @@ bootmain(void)
   ph = (struct proghdr*)((uchar*)elf + elf->phoff);
   eph = ph + elf->phnum;
   for(; ph < eph; ph++){
-    pa = (uchar*)ph->pa;
-    readseg(pa, ph->filesz, ph->offset);
+    pa = (uchar*)ph->paddr;
+    readseg(pa, ph->filesz, ph->off);
     if(ph->memsz > ph->filesz)
       stosb(pa + ph->filesz, 0, ph->memsz - ph->filesz);
   }

elf.h

@@ -24,9 +24,9 @@ struct elfhdr {
 // Program section header
 struct proghdr {
   uint type;
-  uint offset;
-  uint va;
-  uint pa;
+  uint off;
+  uint vaddr;
+  uint paddr;
   uint filesz;
   uint memsz;
   uint flags;

exec.c

@@ -41,9 +41,9 @@ exec(char *path, char **argv)
       continue;
     if(ph.memsz < ph.filesz)
       goto bad;
-    if((sz = allocuvm(pgdir, sz, ph.va + ph.memsz)) == 0)
+    if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0)
       goto bad;
-    if(loaduvm(pgdir, (char*)ph.va, ip, ph.offset, ph.filesz) < 0)
+    if(loaduvm(pgdir, (char*)ph.vaddr, ip, ph.off, ph.filesz) < 0)
       goto bad;
   }
   iunlockput(ip);