+++ /dev/null
-/*
- * Copyright (C) 2003 PathScale, Inc.
- * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#include <linux/personality.h>
-#include <linux/ptrace.h>
-#include <linux/kernel.h>
-#include <asm/unistd.h>
-#include <asm/uaccess.h>
-#include <asm/ucontext.h>
-#include "frame_kern.h"
-#include "skas.h"
-
-void copy_sc(struct uml_pt_regs *regs, void *from)
-{
- struct sigcontext *sc = from;
-
-#define GETREG(regs, regno, sc, regname) \
- (regs)->gp[(regno) / sizeof(unsigned long)] = (sc)->regname
-
- GETREG(regs, R8, sc, r8);
- GETREG(regs, R9, sc, r9);
- GETREG(regs, R10, sc, r10);
- GETREG(regs, R11, sc, r11);
- GETREG(regs, R12, sc, r12);
- GETREG(regs, R13, sc, r13);
- GETREG(regs, R14, sc, r14);
- GETREG(regs, R15, sc, r15);
- GETREG(regs, RDI, sc, di);
- GETREG(regs, RSI, sc, si);
- GETREG(regs, RBP, sc, bp);
- GETREG(regs, RBX, sc, bx);
- GETREG(regs, RDX, sc, dx);
- GETREG(regs, RAX, sc, ax);
- GETREG(regs, RCX, sc, cx);
- GETREG(regs, RSP, sc, sp);
- GETREG(regs, RIP, sc, ip);
- GETREG(regs, EFLAGS, sc, flags);
- GETREG(regs, CS, sc, cs);
-
-#undef GETREG
-}
-
-static int copy_sc_from_user(struct pt_regs *regs,
- struct sigcontext __user *from,
- struct _fpstate __user *fpp)
-{
- struct user_i387_struct fp;
- int err = 0;
-
-#define GETREG(regs, regno, sc, regname) \
- __get_user((regs)->regs.gp[(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, di);
- err |= GETREG(regs, RSI, from, si);
- err |= GETREG(regs, RBP, from, bp);
- err |= GETREG(regs, RBX, from, bx);
- err |= GETREG(regs, RDX, from, dx);
- err |= GETREG(regs, RAX, from, ax);
- err |= GETREG(regs, RCX, from, cx);
- err |= GETREG(regs, RSP, from, sp);
- err |= GETREG(regs, RIP, from, ip);
- err |= GETREG(regs, EFLAGS, from, flags);
- err |= GETREG(regs, CS, from, cs);
- if (err)
- return 1;
-
-#undef GETREG
-
- err = copy_from_user(&fp, fpp, sizeof(struct user_i387_struct));
- if (err)
- return 1;
-
- err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
- (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - "
- "restore_fp_registers failed, errno = %d\n",
- -err);
- return 1;
- }
-
- return 0;
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to,
- struct _fpstate __user *to_fp, struct pt_regs *regs,
- unsigned long mask, unsigned long sp)
-{
- struct faultinfo * fi = ¤t->thread.arch.faultinfo;
- struct user_i387_struct fp;
- 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.gp[(regno) / sizeof(unsigned long)], \
- &(sc)->regname)
-
- err |= PUTREG(regs, RDI, to, di);
- err |= PUTREG(regs, RSI, to, si);
- err |= PUTREG(regs, RBP, to, bp);
- /*
- * Must use original RSP, which is passed in, rather than what's in
- * the pt_regs, because that's already been updated to point at the
- * signal frame.
- */
- err |= __put_user(sp, &to->sp);
- err |= PUTREG(regs, RBX, to, bx);
- err |= PUTREG(regs, RDX, to, dx);
- err |= PUTREG(regs, RCX, to, cx);
- err |= PUTREG(regs, RAX, to, ax);
- 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(fi->cr2, &to->cr2);
- err |= __put_user(fi->error_code, &to->err);
- err |= __put_user(fi->trap_no, &to->trapno);
-
- err |= PUTREG(regs, RIP, to, ip);
- err |= PUTREG(regs, EFLAGS, to, flags);
-#undef PUTREG
-
- err |= __put_user(mask, &to->oldmask);
- if (err)
- return 1;
-
- err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
- (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "
- "failed, errno = %d\n", -err);
- return 1;
- }
-
- if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
- return 1;
-
- return err;
-}
-
-struct rt_sigframe
-{
- char __user *pretcode;
- struct ucontext uc;
- struct siginfo info;
- struct _fpstate fpstate;
-};
-
-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;
- unsigned long save_sp = PT_REGS_RSP(regs);
- int err = 0;
- struct task_struct *me = current;
-
- frame = (struct rt_sigframe __user *)
- round_down(stack_top - sizeof(struct rt_sigframe), 16);
- /* Subtract 128 for a red zone and 8 for proper alignment */
- frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
-
- 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;
- }
-
- /*
- * Update SP now because the page fault handler refuses to extend
- * the stack if the faulting address is too far below the current
- * SP, which frame now certainly is. If there's an error, the original
- * value is restored on the way out.
- * When writing the sigcontext to the stack, we have to write the
- * original value, so that's passed to copy_sc_to_user, which does
- * the right thing with it.
- */
- PT_REGS_RSP(regs) = (unsigned long) frame;
-
- /* 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(save_sp),
- &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, &frame->fpstate, regs,
- set->sig[0], save_sp);
- err |= __put_user(&frame->fpstate, &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 restore_sp;
-
- if (err)
- goto restore_sp;
-
- /* 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;
- out:
- return err;
-
-restore_sp:
- PT_REGS_RSP(regs) = save_sp;
- return err;
-}
-
-long sys_rt_sigreturn(struct pt_regs *regs)
-{
- unsigned long sp = PT_REGS_SP(¤t->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(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext,
- &frame->fpstate))
- goto segfault;
-
- /* Avoid ERESTART handling */
- PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
- return PT_REGS_SYSCALL_RET(¤t->thread.regs);
-
- segfault:
- force_sig(SIGSEGV, current);
- return 0;
-}
git.openpandora.org / pandora-kernel.git / blobdiff