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target-or32: Add linux user support
Add QEMU OpenRISC linux user support. Signed-off-by: Jia Liu <proljc@gmail.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Jia Liu
Blue Swirl
parent
a8720299f1
commit
d962783e98
8 changed files with 422 additions and 4 deletions
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@ -3629,6 +3629,235 @@ long do_rt_sigreturn(CPUCRISState *env)
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return -TARGET_ENOSYS;
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}
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#elif defined(TARGET_OPENRISC)
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struct target_sigcontext {
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struct target_pt_regs regs;
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abi_ulong oldmask;
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abi_ulong usp;
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};
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struct target_ucontext {
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abi_ulong tuc_flags;
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abi_ulong tuc_link;
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target_stack_t tuc_stack;
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struct target_sigcontext tuc_mcontext;
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target_sigset_t tuc_sigmask; /* mask last for extensibility */
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};
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struct target_rt_sigframe {
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abi_ulong pinfo;
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uint64_t puc;
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struct target_siginfo info;
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struct target_sigcontext sc;
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struct target_ucontext uc;
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unsigned char retcode[16]; /* trampoline code */
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};
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/* This is the asm-generic/ucontext.h version */
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#if 0
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static int restore_sigcontext(CPUOpenRISCState *regs,
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struct target_sigcontext *sc)
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{
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unsigned int err = 0;
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unsigned long old_usp;
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/* Alwys make any pending restarted system call return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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/* restore the regs from &sc->regs (same as sc, since regs is first)
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* (sc is already checked for VERIFY_READ since the sigframe was
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* checked in sys_sigreturn previously)
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*/
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if (copy_from_user(regs, &sc, sizeof(struct target_pt_regs))) {
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goto badframe;
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}
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/* make sure the U-flag is set so user-mode cannot fool us */
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regs->sr &= ~SR_SM;
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/* restore the old USP as it was before we stacked the sc etc.
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* (we cannot just pop the sigcontext since we aligned the sp and
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* stuff after pushing it)
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*/
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err |= __get_user(old_usp, &sc->usp);
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phx_signal("old_usp 0x%lx", old_usp);
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__PHX__ REALLY /* ??? */
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wrusp(old_usp);
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regs->gpr[1] = old_usp;
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/* TODO: the other ports use regs->orig_XX to disable syscall checks
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* after this completes, but we don't use that mechanism. maybe we can
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* use it now ?
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*/
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return err;
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badframe:
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return 1;
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}
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#endif
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/* Set up a signal frame. */
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static int setup_sigcontext(struct target_sigcontext *sc,
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CPUOpenRISCState *regs,
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unsigned long mask)
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{
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int err = 0;
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unsigned long usp = regs->gpr[1];
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/* copy the regs. they are first in sc so we can use sc directly */
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/*err |= copy_to_user(&sc, regs, sizeof(struct target_pt_regs));*/
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/* Set the frametype to CRIS_FRAME_NORMAL for the execution of
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the signal handler. The frametype will be restored to its previous
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value in restore_sigcontext. */
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/*regs->frametype = CRIS_FRAME_NORMAL;*/
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/* then some other stuff */
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err |= __put_user(mask, &sc->oldmask);
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err |= __put_user(usp, &sc->usp); return err;
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}
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static inline unsigned long align_sigframe(unsigned long sp)
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{
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unsigned long i;
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i = sp & ~3UL;
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return i;
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}
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static inline abi_ulong get_sigframe(struct target_sigaction *ka,
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CPUOpenRISCState *regs,
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size_t frame_size)
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{
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unsigned long sp = regs->gpr[1];
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int onsigstack = on_sig_stack(sp);
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/* redzone */
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/* This is the X/Open sanctioned signal stack switching. */
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if ((ka->sa_flags & SA_ONSTACK) != 0 && !onsigstack) {
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sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
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}
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sp = align_sigframe(sp - frame_size);
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/*
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* If we are on the alternate signal stack and would overflow it, don't.
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* Return an always-bogus address instead so we will die with SIGSEGV.
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*/
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if (onsigstack && !likely(on_sig_stack(sp))) {
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return -1L;
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}
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return sp;
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}
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static void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUOpenRISCState *env)
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{
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qemu_log("Not implement.\n");
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}
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static void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info,
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target_sigset_t *set, CPUOpenRISCState *env)
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{
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int err = 0;
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abi_ulong frame_addr;
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unsigned long return_ip;
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struct target_rt_sigframe *frame;
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abi_ulong info_addr, uc_addr;
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frame_addr = get_sigframe(ka, env, sizeof *frame);
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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info_addr = frame_addr + offsetof(struct target_rt_sigframe, info);
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err |= __put_user(info_addr, &frame->pinfo);
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uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
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err |= __put_user(uc_addr, &frame->puc);
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if (ka->sa_flags & SA_SIGINFO) {
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err |= copy_siginfo_to_user(&frame->info, info);
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}
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if (err) {
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goto give_sigsegv;
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}
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/*err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));*/
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err |= __put_user(0, &frame->uc.tuc_flags);
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err |= __put_user(0, &frame->uc.tuc_link);
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err |= __put_user(target_sigaltstack_used.ss_sp,
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&frame->uc.tuc_stack.ss_sp);
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err |= __put_user(sas_ss_flags(env->gpr[1]), &frame->uc.tuc_stack.ss_flags);
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err |= __put_user(target_sigaltstack_used.ss_size,
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&frame->uc.tuc_stack.ss_size);
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err |= setup_sigcontext(&frame->sc, env, set->sig[0]);
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/*err |= copy_to_user(frame->uc.tuc_sigmask, set, sizeof(*set));*/
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if (err) {
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goto give_sigsegv;
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}
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/* trampoline - the desired return ip is the retcode itself */
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return_ip = (unsigned long)&frame->retcode;
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/* This is l.ori r11,r0,__NR_sigreturn, l.sys 1 */
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err |= __put_user(0xa960, (short *)(frame->retcode + 0));
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err |= __put_user(TARGET_NR_rt_sigreturn, (short *)(frame->retcode + 2));
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err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4));
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err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
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if (err) {
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goto give_sigsegv;
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}
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/* TODO what is the current->exec_domain stuff and invmap ? */
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/* Set up registers for signal handler */
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env->pc = (unsigned long)ka->_sa_handler; /* what we enter NOW */
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env->gpr[9] = (unsigned long)return_ip; /* what we enter LATER */
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env->gpr[3] = (unsigned long)sig; /* arg 1: signo */
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env->gpr[4] = (unsigned long)&frame->info; /* arg 2: (siginfo_t*) */
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env->gpr[5] = (unsigned long)&frame->uc; /* arg 3: ucontext */
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/* actually move the usp to reflect the stacked frame */
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env->gpr[1] = (unsigned long)frame;
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return;
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give_sigsegv:
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unlock_user_struct(frame, frame_addr, 1);
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if (sig == TARGET_SIGSEGV) {
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ka->_sa_handler = TARGET_SIG_DFL;
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}
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force_sig(TARGET_SIGSEGV);
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}
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long do_sigreturn(CPUOpenRISCState *env)
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{
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qemu_log("do_sigreturn: not implemented\n");
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return -TARGET_ENOSYS;
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}
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long do_rt_sigreturn(CPUOpenRISCState *env)
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{
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qemu_log("do_rt_sigreturn: not implemented\n");
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return -TARGET_ENOSYS;
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}
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/* TARGET_OPENRISC */
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#elif defined(TARGET_S390X)
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#define __NUM_GPRS 16
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