static void
exec_setregs_funcdesc(struct thread *td, struct image_params *imgp,
u_long stack)
{
struct trapframe *tf;
register_t entry_desc[3];
tf = trapframe(td);
exec_setregs(td, imgp, stack);
/*
* For 64-bit ELFv1, we need to disentangle the function
* descriptor
*
* 0. entry point
* 1. TOC value (r2)
* 2. Environment pointer (r11)
*/
(void)copyin((void *)imgp->entry_addr, entry_desc,
sizeof(entry_desc));
tf->srr0 = entry_desc[0] + imgp->reloc_base;
tf->fixreg[2] = entry_desc[1] + imgp->reloc_base;
tf->fixreg[11] = entry_desc[2] + imgp->reloc_base;
}
void
enable_vec(struct thread *td)
{
int msr;
struct pcb *pcb;
struct trapframe *tf;
pcb = td->td_pcb;
tf = trapframe(td);
/*
* Save the thread's Altivec CPU number, and set the CPU's current
* vector thread
*/
td->td_pcb->pcb_veccpu = PCPU_GET(cpuid);
PCPU_SET(vecthread, td);
/*
* Enable the vector unit for when the thread returns from the
* exception. If this is the first time the unit has been used by
* the thread, initialise the vector registers and VSCR to 0, and
* set the flag to indicate that the vector unit is in use.
*/
tf->srr1 |= PSL_VEC;
if (!(pcb->pcb_flags & PCB_VEC)) {
memset(&pcb->pcb_vec, 0, sizeof pcb->pcb_vec);
pcb->pcb_flags |= PCB_VEC;
}
/*
* Temporarily enable the vector unit so the registers
* can be restored.
*/
msr = mfmsr();
mtmsr(msr | PSL_VEC);
isync();
/*
* Restore VSCR by first loading it into a vector and then into VSCR.
* (this needs to done before loading the user's vector registers
* since we need to use a scratch vector register)
*/
__asm __volatile("vxor 0,0,0; lvewx 0,0,%0; mtvscr 0" \
:: "b"(&pcb->pcb_vec.vscr));
#define LVX(n) __asm ("lvx " #n ",0,%0" \
:: "b"(&pcb->pcb_vec.vr[n]));
LVX(0); LVX(1); LVX(2); LVX(3);
LVX(4); LVX(5); LVX(6); LVX(7);
LVX(8); LVX(9); LVX(10); LVX(11);
LVX(12); LVX(13); LVX(14); LVX(15);
LVX(16); LVX(17); LVX(18); LVX(19);
LVX(20); LVX(21); LVX(22); LVX(23);
LVX(24); LVX(25); LVX(26); LVX(27);
LVX(28); LVX(29); LVX(30); LVX(31);
#undef LVX
isync();
mtmsr(msr);
}
/*
* Set the process's program counter.
*/
int
process_set_pc(struct lwp *l, void *addr)
{
struct trapframe * const tf = trapframe(l);
tf->srr0 = (register_t)addr;
return 0;
}
int
process_sstep(struct lwp *l, int sstep)
{
struct trapframe *tf = trapframe(l);
if (sstep)
tf->srr1 |= PSL_SE;
else
tf->srr1 &= ~PSL_SE;
return 0;
}
int
process_write_regs(struct lwp *l, const struct reg *regs)
{
struct trapframe * const tf = trapframe(l);
memcpy(tf->fixreg, regs->fixreg, sizeof(regs->fixreg));
tf->lr = regs->lr;
tf->cr = regs->cr;
tf->xer = regs->xer;
tf->ctr = regs->ctr;
tf->srr0 = regs->pc;
return 0;
}
int
process_read_regs(struct lwp *l, struct reg *regs)
{
struct trapframe * const tf = trapframe(l);
memcpy(regs->fixreg, tf->fixreg, sizeof(regs->fixreg));
regs->lr = tf->lr;
regs->cr = tf->cr;
regs->xer = tf->xer;
regs->ctr = tf->ctr;
regs->pc = tf->srr0;
return 0;
}
/*
* The following needs code review for potential security issues
*/
int
linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct linux_sigcontext *) scp;
} */
struct proc *p = l->l_proc;
struct linux_sigcontext *scp, context;
struct linux_sigregs sregs;
struct linux_pt_regs *lregs;
struct trapframe *tf;
sigset_t mask;
int i;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, scp);
/*
* Get the context from user stack
*/
if (copyin(scp, &context, sizeof(*scp)))
return (EFAULT);
/*
* Restore register context.
*/
if (copyin((void *)context.lregs, &sregs, sizeof(sregs)))
return (EFAULT);
lregs = (struct linux_pt_regs *)&sregs.lgp_regs;
tf = trapframe(l);
#ifdef DEBUG_LINUX
printf("linux_sys_sigreturn: trapframe=0x%lx scp=0x%lx\n",
(unsigned long)tf, (unsigned long)scp);
#endif
if (!PSL_USEROK_P(lregs->lmsr))
return (EINVAL);
for (i = 0; i < 32; i++)
tf->tf_fixreg[i] = lregs->lgpr[i];
tf->tf_lr = lregs->llink;
tf->tf_cr = lregs->lccr;
tf->tf_xer = lregs->lxer;
tf->tf_ctr = lregs->lctr;
tf->tf_srr0 = lregs->lnip;
tf->tf_srr1 = lregs->lmsr;
/*
* Make sure the fpu state is discarded
*/
#ifdef PPC_HAVE_FPU
fpu_discard();
#endif
memcpy(curpcb->pcb_fpu.fpreg, (void *)&sregs.lfp_regs,
sizeof(curpcb->pcb_fpu.fpreg));
fpu_mark_used(curlwp);
mutex_enter(p->p_lock);
/*
* Restore signal stack.
*
* XXX cannot find the onstack information in Linux sig context.
* Is signal stack really supported on Linux?
*/
#if 0
if (sc.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else
#endif
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
linux_old_extra_to_native_sigset(&mask, &context.lmask,
&context._unused[3]);
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
void
linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
const int sig = ksi->ksi_signo;
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct trapframe *tf;
sig_t catcher = SIGACTION(p, sig).sa_handler;
struct linux_sigregs frame;
struct linux_pt_regs linux_regs;
struct linux_sigcontext sc;
register_t fp;
int onstack, error;
int i;
tf = trapframe(l);
/*
* 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;
/*
* Signal stack is broken (see at the end of linux_sigreturn), so we do
* not use it yet. XXX fix this.
*/
onstack=0;
/*
* Allocate space for the signal handler context.
*/
if (onstack) {
fp = (register_t)
((char *)l->l_sigstk.ss_sp +
l->l_sigstk.ss_size);
} else {
fp = tf->tf_fixreg[1];
}
#ifdef DEBUG_LINUX
printf("fp at start of linux_sendsig = %x\n", fp);
#endif
fp -= sizeof(struct linux_sigregs);
fp &= ~0xf;
/*
* Prepare a sigcontext for later.
*/
memset(&sc, 0, sizeof sc);
sc.lsignal = (int)native_to_linux_signo[sig];
sc.lhandler = (unsigned long)catcher;
native_to_linux_old_extra_sigset(&sc.lmask, &sc._unused[3], mask);
sc.lregs = (struct linux_pt_regs*)fp;
/*
* Setup the signal stack frame as Linux does it in
* arch/ppc/kernel/signal.c:setup_frame()
*
* Save register context.
*/
for (i = 0; i < 32; i++)
linux_regs.lgpr[i] = tf->tf_fixreg[i];
linux_regs.lnip = tf->tf_srr0;
linux_regs.lmsr = tf->tf_srr1 & PSL_USERSRR1;
linux_regs.lorig_gpr3 = tf->tf_fixreg[3]; /* XXX Is that right? */
linux_regs.lctr = tf->tf_ctr;
linux_regs.llink = tf->tf_lr;
linux_regs.lxer = tf->tf_xer;
linux_regs.lccr = tf->tf_cr;
linux_regs.lmq = 0; /* Unused, 601 only */
linux_regs.ltrap = tf->tf_exc;
linux_regs.ldar = tf->tf_dar;
linux_regs.ldsisr = tf->tf_dsisr;
linux_regs.lresult = 0;
memset(&frame, 0, sizeof(frame));
memcpy(&frame.lgp_regs, &linux_regs, sizeof(linux_regs));
#ifdef PPC_HAVE_FPU
fpu_save();
#endif
memcpy(&frame.lfp_regs, curpcb->pcb_fpu.fpreg, sizeof(frame.lfp_regs));
/*
* Copy Linux's signal trampoline on the user stack It should not
* be used, but Linux binaries might expect it to be there.
*/
frame.ltramp[0] = 0x38997777; /* li r0, 0x7777 */
frame.ltramp[1] = 0x44000002; /* sc */
/*
* Move it to the user stack
* There is a little trick here, about the LINUX_ABIGAP: the
* linux_sigreg structure has a 56 int gap to support rs6000/xcoff
* binaries. But the Linux kernel seems to do without it, and it
* just skip it when building the stack frame. Hence the LINUX_ABIGAP.
*/
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&frame, (void *)fp, sizeof (frame) - LINUX_ABIGAP);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
mutex_enter(p->p_lock);
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Add a sigcontext on the stack
*/
fp -= sizeof(struct linux_sigcontext);
error = copyout(&sc, (void *)fp, sizeof (struct linux_sigcontext));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Set the registers according to how the Linux process expects them.
* "Mind the gap" Linux expects a gap here.
*/
tf->tf_fixreg[1] = fp - LINUX__SIGNAL_FRAMESIZE;
tf->tf_lr = (int)catcher;
tf->tf_fixreg[3] = (int)native_to_linux_signo[sig];
tf->tf_fixreg[4] = fp;
tf->tf_srr0 = (int)p->p_sigctx.ps_sigcode;
#ifdef DEBUG_LINUX
printf("fp at end of linux_sendsig = %x\n", fp);
#endif
/*
* Remember that we're now on the signal stack.
*/
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
#ifdef DEBUG_LINUX
printf("linux_sendsig: exiting. fp=0x%lx\n",(long)fp);
#endif
}
/*
* Finish a fork operation, with execution context l2 nearly set up.
* Copy and update the pcb and trap frame, making the child ready to run.
*
* Rig the child's kernel stack so that it will have a switch frame which
* returns to cpu_lwp_bootstrap() which will call child_return() with l2
* as its argument. This causes the newly-created child process to go
* directly to user level with an apparent return value of 0 from
* fork(), while the parent process returns normally.
*
* l1 is the execution context being forked; if l1 == &lwp0, we are creating
* a kernel thread, and the return path and argument are specified with
* `func' and `arg'.
*
* If an alternate user-level stack is requested (with non-zero values
* in both the stack and stacksize args), set up the user stack pointer
* accordingly.
*/
void
cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize,
void (*func)(void *), void *arg)
{
/*
* If l1 != curlwp && l1 == &lwp0, we're creating a kernel thread.
*/
KASSERT(l1 == curlwp || l1 == &lwp0);
struct pcb * const pcb1 = lwp_getpcb(l1);
struct pcb * const pcb2 = lwp_getpcb(l2);
/* Copy MD part of lwp and set up user trapframe pointer. */
l2->l_md = l1->l_md;
l2->l_md.md_utf = trapframe(l2);
/* Copy PCB. */
*pcb2 = *pcb1;
pcb2->pcb_pm = l2->l_proc->p_vmspace->vm_map.pmap;
/*
* Setup the trap frame for the new process
*/
*l2->l_md.md_utf = *l1->l_md.md_utf;
/*
* If specified, give the child a different stack. Make sure to
* reserve enough at the top to store the previous LR.
*/
if (stack != NULL) {
l2->l_md.md_utf->tf_fixreg[1] =
((register_t)stack + stacksize - STACK_ALIGNBYTES)
& ~STACK_ALIGNBYTES;
}
/*
* Now deal setting up the initial function and its argument.
*/
struct ktrapframe * const ktf = ktrapframe(l2);
struct callframe * const cf = ((struct callframe *)ktf) - 1;
struct switchframe * const sf = ((struct switchframe *)cf) - 1;
/*
* Align stack pointer
* struct ktrapframe has a partial callframe (sp & lr)
* followed by a real trapframe. The partial callframe
* is for the callee to store LR. The SP isn't really used
* since trap/syscall will use the SP in the trapframe.
* There happens to be a partial callframe in front of the
* trapframe, too.
*/
ktf->ktf_lr = (register_t) cpu_lwp_bootstrap;
ktf->ktf_sp = (register_t) (ktf + 1); /* just in case */
cf->cf_sp = (register_t) ktf;
cf->cf_r31 = (register_t) func;
cf->cf_r30 = (register_t) arg;
memset((void *)sf, 0, sizeof *sf); /* just in case */
sf->sf_sp = (register_t) cf;
#if defined (PPC_OEA) || defined (PPC_OEA64_BRIDGE)
sf->sf_user_sr = pmap_kernel()->pm_sr[USER_SR]; /* again, just in case */
#endif
pcb2->pcb_sp = (register_t)sf;
pcb2->pcb_kmapsr = 0;
pcb2->pcb_umapsr = 0;
#ifdef PPC_HAVE_FPU
pcb2->pcb_flags = PSL_FE_DFLT;
#endif
#ifdef CACHE_PROTO_MEI
{
paddr_t pa;
int dcache_line_size, i;
/* Flush on cache values for other cpu. */
dcache_line_size = curcpu()->ci_ci.dcache_line_size;
pa = vtophys((vaddr_t)sf);
for (i = 0; i < SFRAMELEN + CALLFRAMELEN + FRAMELEN;
i += dcache_line_size) {
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
pa += dcache_line_size;
}
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
pa = vtophys((vaddr_t)pcb2->pcb_pm);
for (i = 0; i < sizeof(*pcb2->pcb_pm); i += dcache_line_size) {
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
pa += dcache_line_size;
}
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
pa = vtophys((vaddr_t)pcb2);
for (i = 0; i < sizeof(*pcb2); i += dcache_line_size) {
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
pa += dcache_line_size;
}
__asm volatile ("dcbf 0,%0"::"r"(pa):"memory");
/* Need more flush? */
}
#endif
}
/*
* Finish a fork operation, with process p2 nearly set up.
*/
void
cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
void (*func)(void *), void *arg)
{
struct trapframe *tf;
struct callframe *cf;
struct switchframe *sf;
caddr_t stktop1, stktop2;
extern void fork_trampoline(void);
struct pcb *pcb = &p2->p_addr->u_pcb;
struct cpu_info *ci = curcpu();
if (p1 == ci->ci_fpuproc)
save_fpu();
*pcb = p1->p_addr->u_pcb;
#ifdef ALTIVEC
if (p1->p_addr->u_pcb.pcb_vr != NULL) {
if (p1 == ci->ci_vecproc)
save_vec(p1);
pcb->pcb_vr = pool_get(&ppc_vecpl, PR_WAITOK);
*pcb->pcb_vr = *p1->p_addr->u_pcb.pcb_vr;
} else
pcb->pcb_vr = NULL;
#endif /* ALTIVEC */
pcb->pcb_pm = p2->p_vmspace->vm_map.pmap;
pmap_extract(pmap_kernel(),
(vaddr_t)pcb->pcb_pm, (paddr_t *)&pcb->pcb_pmreal);
/*
* Setup the trap frame for the new process
*/
stktop1 = (caddr_t)trapframe(p1);
stktop2 = (caddr_t)trapframe(p2);
bcopy(stktop1, stktop2, sizeof(struct trapframe));
/*
* If specified, give the child a different stack.
*/
if (stack != NULL) {
tf = trapframe(p2);
tf->fixreg[1] = (register_t)stack + stacksize;
}
stktop2 = (caddr_t)((u_long)stktop2 & ~15); /* Align stack pointer */
/*
* There happens to be a callframe, too.
*/
cf = (struct callframe *)stktop2;
cf->lr = (int)fork_trampoline;
/*
* Below the trap frame, there is another call frame:
*/
stktop2 -= 16;
cf = (struct callframe *)stktop2;
cf->r31 = (register_t)func;
cf->r30 = (register_t)arg;
/*
* Below that, we allocate the switch frame:
*/
/* must match SFRAMELEN in genassym */
stktop2 -= roundup(sizeof *sf, 16);
sf = (struct switchframe *)stktop2;
bzero((void *)sf, sizeof *sf); /* just in case */
sf->sp = (int)cf;
sf->user_sr = pmap_kernel()->pm_sr[PPC_USER_SR]; /* just in case */
pcb->pcb_sp = (int)stktop2;
}
