void setup_linux_sigframe(struct trapframe *tf, const ksiginfo_t *ksi,
const sigset_t *mask)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct linux_sigframe *sfp, sigframe;
int onstack, error;
int fsize, rndfsize;
int sig = ksi->ksi_signo;
extern char linux_sigcode[], linux_esigcode[];
/* Do we need to jump onto the signal stack? */
onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
(SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
/* Allocate space for the signal handler context. */
fsize = sizeof(struct linux_sigframe);
rndfsize = ((fsize + 15) / 16) * 16;
if (onstack)
sfp = (struct linux_sigframe *)
((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
else
sfp = (struct linux_sigframe *)(alpha_pal_rdusp());
sfp = (struct linux_sigframe *)((char *)sfp - rndfsize);
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid))
printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid,
sig, &onstack, sfp);
#endif /* DEBUG */
/*
* Build the signal context to be used by sigreturn.
*/
memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext));
sigframe.sf_sc.sc_onstack = onstack;
native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask);
sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC];
sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE;
frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs);
sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp();
if (l == fpcurlwp) {
struct pcb *pcb = lwp_getpcb(l);
alpha_pal_wrfen(1);
savefpstate(&pcb->pcb_fp);
alpha_pal_wrfen(0);
sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr;
fpcurlwp = NULL;
}
/* XXX ownedfp ? etc...? */
sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0];
sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1];
sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2];
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout((void *)&sigframe, (void *)sfp, fsize);
mutex_enter(p->p_lock);
if (error != 0) {
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig(%d): copyout failed on sig %d\n",
p->p_pid, sig);
#endif
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
/* Pass pointers to sigcontext in the regs */
tf->tf_regs[FRAME_A1] = 0;
tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc;
/* Address of trampoline code. End up at this PC after mi_switch */
tf->tf_regs[FRAME_PC] =
(u_int64_t)(p->p_psstrp - (linux_esigcode - linux_sigcode));
/* Adjust the stack */
alpha_pal_wrusp((unsigned long)sfp);
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
}
void
sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct sigacts *ps = p->p_sigacts;
int onstack, sig = ksi->ksi_signo;
struct sigframe_sigcontext *fp, frame;
struct trapframe *tf;
sig_t catcher = SIGACTION(p, sig).sa_handler;
tf = l->l_md.md_tf;
fp = getframe(l, sig, &onstack), frame;
fp--;
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n",
p->p_pid, sig, &onstack, fp);
#endif
/* Build stack frame for signal trampoline. */
frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC];
frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS];
/* Save register context. */
frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs);
frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */
frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp();
/* save the floating-point state, if necessary, then copy it. */
if (l->l_addr->u_pcb.pcb_fpcpu != NULL)
fpusave_proc(l, 1);
frame.sf_sc.sc_ownedfp = l->l_md.md_flags & MDP_FPUSED;
memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &l->l_addr->u_pcb.pcb_fp,
sizeof(struct fpreg));
frame.sf_sc.sc_fp_control = alpha_read_fp_c(l);
memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved);
memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */
/* Save signal stack. */
frame.sf_sc.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
frame.sf_sc.sc_mask = *mask;
#ifdef COMPAT_13
/*
* XXX We always have to save an old style signal mask because
* XXX we might be delivering a signal to a process which will
* XXX escape from the signal in a non-standard way and invoke
* XXX sigreturn() directly.
*/
{
/* Note: it's a long in the stack frame. */
sigset13_t mask13;
native_sigset_to_sigset13(mask, &mask13);
frame.sf_sc.__sc_mask13 = mask13;
}
#endif
#ifdef COMPAT_OSF1
/*
* XXX Create an OSF/1-style sigcontext and associated goo.
*/
#endif
if (copyout(&frame, (caddr_t)fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig_sigcontext(%d): copyout failed on sig %d\n",
p->p_pid, sig);
#endif
sigexit(l, SIGILL);
/* NOTREACHED */
}
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n",
p->p_pid, sig, fp, ksi->ksi_code);
#endif
/*
* Set up the registers to directly invoke the signal handler. The
* signal trampoline is then used to return from the signal. Note
* the trampoline version numbers are coordinated with machine-
* dependent code in libc.
*/
switch (ps->sa_sigdesc[sig].sd_vers) {
case 0: /* legacy on-stack sigtramp */
buildcontext(l,(void *)catcher,
(void *)p->p_sigctx.ps_sigcode,
(void *)fp);
break;
case 1:
buildcontext(l,(void *)catcher,
(void *)ps->sa_sigdesc[sig].sd_tramp,
(void *)fp);
break;
default:
/* Don't know what trampoline version; kill it. */
sigexit(l, SIGILL);
}
/* sigcontext specific trap frame */
tf->tf_regs[FRAME_A0] = sig;
/* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */
tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi);
tf->tf_regs[FRAME_A2] = (u_int64_t)&fp->sf_sc;
/* Remember that we're now on the signal stack. */
if (onstack)
p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid,
tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]);
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig(%d): sig %d returns\n",
p->p_pid, sig);
#endif
}
