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Add the infamous IOPL sanity check, and speed up some bits.

This commit is contained in:
mycroft 1994-01-09 15:02:24 +00:00
parent f8154a63c0
commit f1be23e81a
1 changed files with 35 additions and 38 deletions
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73
sys/arch/i386/i386/process_machdep.c
View File

@ -37,7 +37,7 @@
* From:
* Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
*
* $Id: process_machdep.c,v 1.1 1994/01/08 11:13:06 cgd Exp $
* $Id: process_machdep.c,v 1.2 1994/01/09 15:02:24 mycroft Exp $
*/
/*
@ -118,40 +118,33 @@ process_write_regs(p, regs)
{
void *ptr;
struct trapframe *tp;
u_int eflags;
int eflags;
if ((p->p_flag & SLOAD) == 0)
return (EIO);
ptr = (char *)p->p_addr + ((char *) p->p_regs - (char *) kstack);
tp = ptr;
eflags = regs->r_eflags;
#ifdef notdef /* BSDI's got a per-proc bitmap possible, apparently */
if ((eflags & PSL_USERCLR) != 0 ||
(eflags & PSL_USERSET) != PSL_USERSET ||
(eflags & PSL_IOPL &&
(p->p_md.md_flags & MDP_IOPL) == 0))
return (EPERM);
#else /* XXX - MORE THAN THIS! */
if ((eflags & PSL_USERCLR) != 0 ||
(eflags & PSL_USERSET) != PSL_USERSET)
(eflags & PSL_IOPL) > (tp->tf_eflags & PSL_IOPL))
return (EPERM);
#endif
tp = ptr;
tp->tf_es = regs->r_es;
tp->tf_ds = regs->r_ds;
tp->tf_edi = regs->r_edi;
tp->tf_esi = regs->r_esi;
tp->tf_ebp = regs->r_ebp;
tp->tf_ebx = regs->r_ebx;
tp->tf_edx = regs->r_edx;
tp->tf_ecx = regs->r_ecx;
tp->tf_eax = regs->r_eax;
tp->tf_eip = regs->r_eip;
tp->tf_cs = regs->r_cs;
tp->tf_eflags = eflags;
tp->tf_esp = regs->r_esp;
tp->tf_eip = regs->r_eip;
tp->tf_eflags = eflags;
tp->tf_eax = regs->r_eax;
tp->tf_ebx = regs->r_ebx;
tp->tf_ecx = regs->r_ecx;
tp->tf_edx = regs->r_edx;
tp->tf_esi = regs->r_esi;
tp->tf_edi = regs->r_edi;
tp->tf_cs = regs->r_cs;
tp->tf_ds = regs->r_ds;
tp->tf_es = regs->r_es;
tp->tf_ss = regs->r_ss;
return (0);
@ -161,16 +154,18 @@ int
process_sstep(p)
struct proc *p;
{
int error;
struct reg r;
void *ptr;
struct trapframe *tp;
error = process_read_regs(p, &r);
if (error == 0) {
r.r_eflags |= PSL_T;
error = process_write_regs(p, &r);
}
if ((p->p_flag & SLOAD) == 0)
return (EIO);
return (error);
ptr = (char *) p->p_addr + ((char *) p->p_regs - (char *) kstack);
tp = ptr;
tp->tf_eflags |= PSL_T;
return (0);
}
int
@ -185,14 +180,16 @@ process_set_pc(p, addr)
struct proc *p;
u_int addr;
{
int error;
struct reg r;
void *ptr;
struct trapframe *tp;
error = process_read_regs(p, &r);
if (error == 0) {
r.r_eip = addr;
error = process_write_regs(p, &r);
}
if ((p->p_flag & SLOAD) == 0)
return (EIO);
return (error);
ptr = (char *) p->p_addr + ((char *) p->p_regs - (char *) kstack);
tp = ptr;
tp->tf_eip = addr;
return (0);
}