diff options
author | rsc <rsc> | 2007-08-14 04:55:45 +0000 |
---|---|---|
committer | rsc <rsc> | 2007-08-14 04:55:45 +0000 |
commit | 2ef3a64bb4923d3458bac1393dd9e205f0acd93a (patch) | |
tree | 2f56b815b2a7182b9d029cb71f75f4d7df6a676a /proc.c | |
parent | 64659055bd8ed3717a691d0311666d94195aebee (diff) | |
download | xv6-labs-2ef3a64bb4923d3458bac1393dd9e205f0acd93a.tar.gz xv6-labs-2ef3a64bb4923d3458bac1393dd9e205f0acd93a.tar.bz2 xv6-labs-2ef3a64bb4923d3458bac1393dd9e205f0acd93a.zip |
Because limit gives the address of the last addressable
byte in the segment, the limit argument to SEG16 and SEG
needs to have 1 subtracted from it.
Diffstat (limited to 'proc.c')
-rw-r--r-- | proc.c | 8 |
1 files changed, 4 insertions, 4 deletions
@@ -38,13 +38,13 @@ setupsegs(struct proc *p) } c->gdt[0] = SEG_NULL; - c->gdt[SEG_KCODE] = SEG(STA_X|STA_R, 0, 0x100000 + 64*1024, 0); + c->gdt[SEG_KCODE] = SEG(STA_X|STA_R, 0, 0x100000 + 64*1024-1, 0); c->gdt[SEG_KDATA] = SEG(STA_W, 0, 0xffffffff, 0); - c->gdt[SEG_TSS] = SEG16(STS_T32A, (uint) &c->ts, sizeof(c->ts), 0); + c->gdt[SEG_TSS] = SEG16(STS_T32A, (uint)&c->ts, sizeof(c->ts)-1, 0); c->gdt[SEG_TSS].s = 0; if(p){ - c->gdt[SEG_UCODE] = SEG(STA_X|STA_R, (uint)p->mem, p->sz, DPL_USER); - c->gdt[SEG_UDATA] = SEG(STA_W, (uint)p->mem, p->sz, DPL_USER); + c->gdt[SEG_UCODE] = SEG(STA_X|STA_R, (uint)p->mem, p->sz-1, DPL_USER); + c->gdt[SEG_UDATA] = SEG(STA_W, (uint)p->mem, p->sz-1, DPL_USER); } else { c->gdt[SEG_UCODE] = SEG_NULL; c->gdt[SEG_UDATA] = SEG_NULL; |