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Diffstat (limited to 'arch/um/sys-x86_64/signal.c')
-rw-r--r--arch/um/sys-x86_64/signal.c276
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 00000000000..5bc5a0d796e
--- /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:
+ */
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