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pre-APPROVEd (thanks Arun) sanity check function.

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This commit is contained in:
Ben Gras 2009-09-25 11:12:06 +00:00
parent 97fe6a4ba5
commit 1d0854e6db
1 changed files with 43 additions and 0 deletions
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43
kernel/arch/i386/protect.c
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@ -339,6 +339,49 @@ PUBLIC void alloc_segments(register struct proc *rp)
rp->p_reg.ds = (DS_LDT_INDEX*DESC_SIZE) | TI | privilege;
}
/*===========================================================================*
* check_segments *
*===========================================================================*/
PUBLIC void check_segments(char *File, int line)
{
int checked = 0;
int fail = 0;
struct proc *rp;
for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; ++rp) {
int privilege;
int cs, ds;
if (RTS_ISSET(rp, SLOT_FREE))
continue;
if( (iskernelp(rp)))
privilege = TASK_PRIVILEGE;
else
privilege = USER_PRIVILEGE;
cs = (CS_LDT_INDEX*DESC_SIZE) | TI | privilege;
ds = (DS_LDT_INDEX*DESC_SIZE) | TI | privilege;
#define CHECK(s1, s2) if(s1 != s2) { \
printf("%s:%d: " #s1 " != " #s2 " for ep %d\n", \
File, line, rp->p_endpoint); fail++; } checked++;
CHECK(rp->p_reg.cs, cs);
CHECK(rp->p_reg.gs, ds);
CHECK(rp->p_reg.fs, ds);
CHECK(rp->p_reg.ss, ds);
if(rp->p_endpoint != -2) {
CHECK(rp->p_reg.es, ds);
}
CHECK(rp->p_reg.ds, ds);
}
if(fail) {
printf("%d/%d checks failed\n", fail, checked);
minix_panic("wrong", fail);
}
}
/*===========================================================================*
* printseg *
*===========================================================================*/