1 files changed, 276 insertions, 0 deletions

diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
new file mode 100644
index 000000000000..5bc5a0d796e5
--- /dev/null
+++ b/arch/um/sys-x86_64/signal.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/errno.h"
+#include "linux/personality.h"
+#include "linux/ptrace.h"
+#include "asm/current.h"
+#include "asm/uaccess.h"
+#include "asm/sigcontext.h"
+#include "asm/ptrace.h"
+#include "asm/arch/ucontext.h"
+#include "choose-mode.h"
+#include "sysdep/ptrace.h"
+#include "frame_kern.h"
+
+#ifdef CONFIG_MODE_SKAS
+
+#include "skas.h"
+
+static int copy_sc_from_user_skas(struct pt_regs *regs,
+                                 struct sigcontext *from)
+{
+       int err = 0;
+
+#define GETREG(regs, regno, sc, regname) \
+       __get_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+                  &(sc)->regname)
+
+       err |= GETREG(regs, R8, from, r8);
+       err |= GETREG(regs, R9, from, r9);
+       err |= GETREG(regs, R10, from, r10);
+       err |= GETREG(regs, R11, from, r11);
+       err |= GETREG(regs, R12, from, r12);
+       err |= GETREG(regs, R13, from, r13);
+       err |= GETREG(regs, R14, from, r14);
+       err |= GETREG(regs, R15, from, r15);
+       err |= GETREG(regs, RDI, from, rdi);
+       err |= GETREG(regs, RSI, from, rsi);
+       err |= GETREG(regs, RBP, from, rbp);
+       err |= GETREG(regs, RBX, from, rbx);
+       err |= GETREG(regs, RDX, from, rdx);
+       err |= GETREG(regs, RAX, from, rax);
+       err |= GETREG(regs, RCX, from, rcx);
+       err |= GETREG(regs, RSP, from, rsp);
+       err |= GETREG(regs, RIP, from, rip);
+       err |= GETREG(regs, EFLAGS, from, eflags);
+       err |= GETREG(regs, CS, from, cs);
+
+#undef GETREG
+
+       return(err);
+}
+
+int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
+                        struct pt_regs *regs, unsigned long mask)
+{
+        unsigned long eflags;
+        int err = 0;
+
+        err |= __put_user(0, &to->gs);
+        err |= __put_user(0, &to->fs);
+
+#define PUTREG(regs, regno, sc, regname) \
+       __put_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+                  &(sc)->regname)
+
+        err |= PUTREG(regs, RDI, to, rdi);
+        err |= PUTREG(regs, RSI, to, rsi);
+        err |= PUTREG(regs, RBP, to, rbp);
+        err |= PUTREG(regs, RSP, to, rsp);
+        err |= PUTREG(regs, RBX, to, rbx);
+        err |= PUTREG(regs, RDX, to, rdx);
+        err |= PUTREG(regs, RCX, to, rcx);
+        err |= PUTREG(regs, RAX, to, rax);
+        err |= PUTREG(regs, R8, to, r8);
+        err |= PUTREG(regs, R9, to, r9);
+        err |= PUTREG(regs, R10, to, r10);
+        err |= PUTREG(regs, R11, to, r11);
+        err |= PUTREG(regs, R12, to, r12);
+        err |= PUTREG(regs, R13, to, r13);
+        err |= PUTREG(regs, R14, to, r14);
+        err |= PUTREG(regs, R15, to, r15);
+        err |= PUTREG(regs, CS, to, cs); /* XXX x86_64 doesn't do this */
+        err |= __put_user(current->thread.err, &to->err);
+        err |= __put_user(current->thread.trap_no, &to->trapno);
+        err |= PUTREG(regs, RIP, to, rip);
+        err |= PUTREG(regs, EFLAGS, to, eflags);
+#undef PUTREG
+
+        err |= __put_user(mask, &to->oldmask);
+        err |= __put_user(current->thread.cr2, &to->cr2);
+
+        return(err);
+}
+
+#endif
+
+#ifdef CONFIG_MODE_TT
+int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
+                        int fpsize)
+{
+       struct _fpstate *to_fp, *from_fp;
+       unsigned long sigs;
+       int err;
+
+       to_fp = to->fpstate;
+       from_fp = from->fpstate;
+       sigs = to->oldmask;
+       err = copy_from_user(to, from, sizeof(*to));
+       to->oldmask = sigs;
+       return(err);
+}
+
+int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
+                      struct sigcontext *from, int fpsize)
+{
+       struct _fpstate *to_fp, *from_fp;
+       int err;
+
+       to_fp = (fp ? fp : (struct _fpstate *) (to + 1));
+       from_fp = from->fpstate;
+       err = copy_to_user(to, from, sizeof(*to));
+       return(err);
+}
+
+#endif
+
+static int copy_sc_from_user(struct pt_regs *to, void __user *from)
+{
+       int ret;
+
+       ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
+                                              sizeof(struct _fpstate)),
+                         copy_sc_from_user_skas(to, from));
+       return(ret);
+}
+
+static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
+                          struct pt_regs *from, unsigned long mask)
+{
+       return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
+                                             sizeof(*fp)),
+                          copy_sc_to_user_skas(to, fp, from, mask)));
+}
+
+struct rt_sigframe
+{
+       char *pretcode;
+       struct ucontext uc;
+       struct siginfo info;
+};
+
+#define round_down(m, n) (((m) / (n)) * (n))
+
+int setup_signal_stack_si(unsigned long stack_top, int sig,
+                          struct k_sigaction *ka, struct pt_regs * regs,
+                          siginfo_t *info, sigset_t *set)
+{
+        struct rt_sigframe __user *frame;
+        struct _fpstate __user *fp = NULL;
+        int err = 0;
+        struct task_struct *me = current;
+
+        frame = (struct rt_sigframe __user *)
+                round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
+        frame -= 128;
+
+        if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
+                goto out;
+
+#if 0 /* XXX */
+        if (save_i387(fp) < 0)
+                err |= -1;
+#endif
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto out;
+
+        if (ka->sa.sa_flags & SA_SIGINFO) {
+                err |= copy_siginfo_to_user(&frame->info, info);
+                if (err)
+                        goto out;
+        }
+
+        /* Create the ucontext.  */
+        err |= __put_user(0, &frame->uc.uc_flags);
+        err |= __put_user(0, &frame->uc.uc_link);
+        err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(PT_REGS_SP(regs)),
+                          &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= copy_sc_to_user(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
+        err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate);
+        if (sizeof(*set) == 16) {
+                __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
+                __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
+        }
+        else
+                err |= __copy_to_user(&frame->uc.uc_sigmask, set,
+                                      sizeof(*set));
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        /* x86-64 should always use SA_RESTORER. */
+        if (ka->sa.sa_flags & SA_RESTORER)
+                err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+        else
+                /* could use a vstub here */
+                goto out;
+
+        if (err)
+                goto out;
+
+        /* Set up registers for signal handler */
+        {
+                struct exec_domain *ed = current_thread_info()->exec_domain;
+                if (unlikely(ed && ed->signal_invmap && sig < 32))
+                        sig = ed->signal_invmap[sig];
+        }
+
+        PT_REGS_RDI(regs) = sig;
+        /* In case the signal handler was declared without prototypes */
+        PT_REGS_RAX(regs) = 0;
+
+        /* This also works for non SA_SIGINFO handlers because they expect the
+           next argument after the signal number on the stack. */
+        PT_REGS_RSI(regs) = (unsigned long) &frame->info;
+        PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
+        PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
+
+        PT_REGS_RSP(regs) = (unsigned long) frame;
+ out:
+        return(err);
+}
+
+long sys_rt_sigreturn(struct pt_regs *regs)
+{
+        unsigned long sp = PT_REGS_SP(&current->thread.regs);
+        struct rt_sigframe __user *frame =
+                (struct rt_sigframe __user *)(sp - 8);
+        struct ucontext __user *uc = &frame->uc;
+        sigset_t set;
+
+        if(copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
+                goto segfault;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if(copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
+                goto segfault;
+
+        /* Avoid ERESTART handling */
+        PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
+        return(PT_REGS_SYSCALL_RET(&current->thread.regs));
+
+ segfault:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */