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Lab 4

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This commit is contained in:
Anish Athalye
2018-10-06 09:52:47 -04:00
parent a9d7717cc4
commit da1f8392b1
56 changed files with 2696 additions and 37 deletions
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7
boot/main.c
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@@ -39,6 +39,7 @@ void
bootmain(void)
{
struct Proghdr *ph, *eph;
int i;
// read 1st page off disk
readseg((uint32_t) ELFHDR, SECTSIZE*8, 0);
@@ -50,10 +51,14 @@ bootmain(void)
// load each program segment (ignores ph flags)
ph = (struct Proghdr *) ((uint8_t *) ELFHDR + ELFHDR->e_phoff);
eph = ph + ELFHDR->e_phnum;
for (; ph < eph; ph++)
for (; ph < eph; ph++) {
// p_pa is the load address of this segment (as well
// as the physical address)
readseg(ph->p_pa, ph->p_memsz, ph->p_offset);
for (i = 0; i < ph->p_memsz - ph->p_filesz; i++) {
*((char *) ph->p_pa + ph->p_filesz + i) = 0;
}
}
// call the entry point from the ELF header
// note: does not return!