static int
watch_suword32(void *addr, uint32_t value)
{
klwp_t *lwp = ttolwp(curthread);
int watchcode;
caddr_t vaddr;
int mapped;
int rv = 0;
int ta;
label_t ljb;
for (;;) {
vaddr = (caddr_t)addr;
watchcode = pr_is_watchpoint(&vaddr, &ta, sizeof (value), NULL,
S_WRITE);
if (watchcode == 0 || ta != 0) {
mapped = pr_mappage((caddr_t)addr, sizeof (value),
S_WRITE, 1);
if (on_fault(&ljb))
rv = -1;
else
suword32_noerr(addr, value);
no_fault();
if (mapped)
pr_unmappage((caddr_t)addr, sizeof (value),
S_WRITE, 1);
}
if (watchcode &&
(!sys_watchpoint(vaddr, watchcode, ta) ||
lwp->lwp_sysabort)) {
lwp->lwp_sysabort = 0;
rv = -1;
break;
}
if (watchcode == 0 || ta != 0)
break;
}
return (rv);
}
int
sendsig(int sig, k_siginfo_t *sip, void (*hdlr)())
{
volatile int minstacksz;
int newstack;
label_t ljb;
volatile caddr_t sp;
caddr_t fp;
struct regs *rp;
volatile greg_t upc;
volatile proc_t *p = ttoproc(curthread);
klwp_t *lwp = ttolwp(curthread);
ucontext_t *volatile tuc = NULL;
ucontext_t *uc;
siginfo_t *sip_addr;
volatile int watched;
rp = lwptoregs(lwp);
upc = rp->r_pc;
minstacksz = SA(sizeof (struct sigframe)) + SA(sizeof (*uc));
if (sip != NULL)
minstacksz += SA(sizeof (siginfo_t));
ASSERT((minstacksz & (STACK_ALIGN - 1ul)) == 0);
/*
* Figure out whether we will be handling this signal on
* an alternate stack specified by the user. Then allocate
* and validate the stack requirements for the signal handler
* context. on_fault will catch any faults.
*/
newstack = sigismember(&PTOU(curproc)->u_sigonstack, sig) &&
!(lwp->lwp_sigaltstack.ss_flags & (SS_ONSTACK|SS_DISABLE));
if (newstack) {
fp = (caddr_t)(SA((uintptr_t)lwp->lwp_sigaltstack.ss_sp) +
SA(lwp->lwp_sigaltstack.ss_size) - STACK_ALIGN);
} else if ((rp->r_ss & 0xffff) != UDS_SEL) {
user_desc_t *ldt;
/*
* If the stack segment selector is -not- pointing at
* the UDS_SEL descriptor and we have an LDT entry for
* it instead, add the base address to find the effective va.
*/
if ((ldt = p->p_ldt) != NULL)
fp = (caddr_t)rp->r_sp +
USEGD_GETBASE(&ldt[SELTOIDX(rp->r_ss)]);
else
fp = (caddr_t)rp->r_sp;
} else
fp = (caddr_t)rp->r_sp;
/*
* Force proper stack pointer alignment, even in the face of a
* misaligned stack pointer from user-level before the signal.
* Don't use the SA() macro because that rounds up, not down.
*/
fp = (caddr_t)((uintptr_t)fp & ~(STACK_ALIGN - 1ul));
sp = fp - minstacksz;
/*
* Make sure lwp hasn't trashed its stack.
*/
if (sp >= (caddr_t)USERLIMIT || fp >= (caddr_t)USERLIMIT) {
#ifdef DEBUG
printf("sendsig: bad signal stack cmd=%s, pid=%d, sig=%d\n",
PTOU(p)->u_comm, p->p_pid, sig);
printf("sigsp = 0x%p, action = 0x%p, upc = 0x%lx\n",
(void *)sp, (void *)hdlr, (uintptr_t)upc);
printf("sp above USERLIMIT\n");
#endif
return (0);
}
watched = watch_disable_addr((caddr_t)sp, minstacksz, S_WRITE);
if (on_fault(&ljb))
goto badstack;
if (sip != NULL) {
zoneid_t zoneid;
fp -= SA(sizeof (siginfo_t));
uzero(fp, sizeof (siginfo_t));
if (SI_FROMUSER(sip) &&
(zoneid = p->p_zone->zone_id) != GLOBAL_ZONEID &&
zoneid != sip->si_zoneid) {
k_siginfo_t sani_sip = *sip;
sani_sip.si_pid = p->p_zone->zone_zsched->p_pid;
sani_sip.si_uid = 0;
sani_sip.si_ctid = -1;
sani_sip.si_zoneid = zoneid;
copyout_noerr(&sani_sip, fp, sizeof (sani_sip));
} else
copyout_noerr(sip, fp, sizeof (*sip));
sip_addr = (siginfo_t *)fp;
if (sig == SIGPROF &&
curthread->t_rprof != NULL &&
curthread->t_rprof->rp_anystate) {
/*
* We stand on our head to deal with
* the real time profiling signal.
* Fill in the stuff that doesn't fit
* in a normal k_siginfo structure.
*/
int i = sip->si_nsysarg;
while (--i >= 0)
suword32_noerr(&(sip_addr->si_sysarg[i]),
(uint32_t)lwp->lwp_arg[i]);
copyout_noerr(curthread->t_rprof->rp_state,
sip_addr->si_mstate,
sizeof (curthread->t_rprof->rp_state));
}
} else
sip_addr = NULL;
/* save the current context on the user stack */
fp -= SA(sizeof (*tuc));
uc = (ucontext_t *)fp;
tuc = kmem_alloc(sizeof (*tuc), KM_SLEEP);
savecontext(tuc, &lwp->lwp_sigoldmask);
copyout_noerr(tuc, uc, sizeof (*tuc));
kmem_free(tuc, sizeof (*tuc));
tuc = NULL;
lwp->lwp_oldcontext = (uintptr_t)uc;
if (newstack) {
lwp->lwp_sigaltstack.ss_flags |= SS_ONSTACK;
if (lwp->lwp_ustack)
copyout_noerr(&lwp->lwp_sigaltstack,
(stack_t *)lwp->lwp_ustack, sizeof (stack_t));
}
/*
* Set up signal handler arguments
*/
{
struct sigframe frame;
frame.sip = sip_addr;
frame.ucp = uc;
frame.signo = sig;
frame.retaddr = (void (*)())0xffffffff; /* never return! */
copyout_noerr(&frame, sp, sizeof (frame));
}
no_fault();
if (watched)
watch_enable_addr((caddr_t)sp, minstacksz, S_WRITE);
rp->r_sp = (greg_t)sp;
rp->r_pc = (greg_t)hdlr;
rp->r_ps = PSL_USER | (rp->r_ps & PS_IOPL);
if ((rp->r_cs & 0xffff) != UCS_SEL ||
(rp->r_ss & 0xffff) != UDS_SEL) {
rp->r_cs = UCS_SEL;
rp->r_ss = UDS_SEL;
}
/*
* Don't set lwp_eosys here. sendsig() is called via psig() after
* lwp_eosys is handled, so setting it here would affect the next
* system call.
*/
return (1);
badstack:
no_fault();
if (watched)
watch_enable_addr((caddr_t)sp, minstacksz, S_WRITE);
if (tuc)
kmem_free(tuc, sizeof (*tuc));
#ifdef DEBUG
printf("sendsig: bad signal stack cmd=%s, pid=%d, sig=%d\n",
PTOU(p)->u_comm, p->p_pid, sig);
printf("on fault, sigsp = 0x%p, action = 0x%p, upc = 0x%lx\n",
(void *)sp, (void *)hdlr, (uintptr_t)upc);
#endif
return (0);
}
