#include <linux/signal.h>
#include <linux/ptrace.h>
#include <linux/personality.h>
-#include <linux/suspend.h>
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
return ret;
}
-/*
- * Do a signal return; undo the signal stack.
- */
-struct sigframe
-{
- struct sigcontext sc;
- unsigned long extramask[_NSIG_WORDS-1];
- unsigned long retcode;
-};
-
-struct rt_sigframe
-{
- struct siginfo __user *pinfo;
- void __user *puc;
- struct siginfo info;
- struct ucontext uc;
- unsigned long retcode;
-};
-
#ifdef CONFIG_IWMMXT
/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
#define IWMMXT_MAGIC0 0x12ef842a
#define IWMMXT_MAGIC1 0x1c07ca71
-static int page_present(struct mm_struct *mm, unsigned long addr, int wr)
+struct iwmmxt_sigframe {
+ unsigned long magic0;
+ unsigned long magic1;
+ unsigned long storage[0x98/4];
+};
+
+static int page_present(struct mm_struct *mm, void __user *uptr, int wr)
{
+ unsigned long addr = (unsigned long)uptr;
pgd_t *pgd = pgd_offset(mm, addr);
if (pgd_present(*pgd)) {
pmd_t *pmd = pmd_offset(pgd, addr);
return 0;
}
-static int
-preserve_iwmmxt_context(void *iwmmxt_save_area)
+static int copy_locked(void __user *uptr, void *kptr, size_t size, int write,
+ void (*copyfn)(void *, void __user *))
+{
+ unsigned char v, __user *userptr = uptr;
+ int err = 0;
+
+ do {
+ struct mm_struct *mm;
+
+ if (write) {
+ __put_user_error(0, userptr, err);
+ __put_user_error(0, userptr + size - 1, err);
+ } else {
+ __get_user_error(v, userptr, err);
+ __get_user_error(v, userptr + size - 1, err);
+ }
+
+ if (err)
+ break;
+
+ mm = current->mm;
+ spin_lock(&mm->page_table_lock);
+ if (page_present(mm, userptr, write) &&
+ page_present(mm, userptr + size - 1, write)) {
+ copyfn(kptr, uptr);
+ } else
+ err = 1;
+ spin_unlock(&mm->page_table_lock);
+ } while (err);
+
+ return err;
+}
+
+static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame)
{
int err = 0;
/* the iWMMXt context must be 64 bit aligned */
- long *iwmmxt_storage = (long *)(((long)iwmmxt_save_area + 4) & ~7);
+ WARN_ON((unsigned long)frame & 7);
+
+ __put_user_error(IWMMXT_MAGIC0, &frame->magic0, err);
+ __put_user_error(IWMMXT_MAGIC1, &frame->magic1, err);
-again:
- __put_user_error(IWMMXT_MAGIC0, iwmmxt_storage+0, err);
- __put_user_error(IWMMXT_MAGIC1, iwmmxt_storage+1, err);
/*
* iwmmxt_task_copy() doesn't check user permissions.
* Let's do a dummy write on the upper boundary to ensure
* access to user mem is OK all way up.
*/
- __put_user_error(0, iwmmxt_storage+IWMMXT_STORAGE_SIZE/4-1, err);
- if (!err) {
- /* Let's make sure the user mapping won't disappear under us */
- struct mm_struct *mm = current->mm;
- unsigned long addr = (unsigned long)iwmmxt_storage;
- spin_lock(&mm->page_table_lock);
- if ( !page_present(mm, addr, 1) ||
- !page_present(mm, addr+IWMMXT_STORAGE_SIZE-1, 1) ) {
- /* our user area has gone before grabbing the lock */
- spin_unlock(&mm->page_table_lock);
- goto again;
- }
- iwmmxt_task_copy(current_thread_info(), iwmmxt_storage+2);
- spin_unlock(&mm->page_table_lock);
- return 0;
- }
+ err |= copy_locked(&frame->storage, current_thread_info(),
+ sizeof(frame->storage), 1, iwmmxt_task_copy);
return err;
}
-static int
-restore_iwmmxt_context(void *iwmmxt_save_area)
+static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
{
+ unsigned long magic0, magic1;
int err = 0;
- long *iwmmxt_storage, magic0, magic1, dummy;
/* the iWMMXt context is 64 bit aligned */
- iwmmxt_storage = (long *)(((long)iwmmxt_save_area + 4) & ~7);
+ WARN_ON((unsigned long)frame & 7);
/*
* Validate iWMMXt context signature.
* Let's do a dummy write on the upper boundary to ensure
* access to user mem is OK all way up.
*/
-again:
- __get_user_error(magic0, iwmmxt_storage+0, err);
- __get_user_error(magic1, iwmmxt_storage+1, err);
- if (!err && magic0 == IWMMXT_MAGIC0 && magic1 == IWMMXT_MAGIC1 &&
- !__get_user(dummy, iwmmxt_storage+IWMMXT_STORAGE_SIZE/4-1)) {
- /* Let's make sure the user mapping won't disappear under us */
- struct mm_struct *mm = current->mm;
- unsigned long addr = (unsigned long)iwmmxt_storage;
- spin_lock(&mm->page_table_lock);
- if ( !page_present(mm, addr, 0) ||
- !page_present(mm, addr+IWMMXT_STORAGE_SIZE-1, 0) ) {
- /* our user area has gone before grabbing the lock */
- spin_unlock(&mm->page_table_lock);
- goto again;
- }
- iwmmxt_task_restore(current_thread_info(), iwmmxt_storage+2);
- spin_unlock(&mm->page_table_lock);
- return 0;
- }
- return -1;
+ __get_user_error(magic0, &frame->magic0, err);
+ __get_user_error(magic1, &frame->magic1, err);
+ if (!err && magic0 == IWMMXT_MAGIC0 && magic1 == IWMMXT_MAGIC1)
+ err = copy_locked(&frame->storage, current_thread_info(),
+ sizeof(frame->storage), 0, iwmmxt_task_restore);
+ return err;
}
#endif
+/*
+ * Auxiliary signal frame. This saves stuff like FP state.
+ * The layout of this structure is not part of the user ABI.
+ */
+struct aux_sigframe {
+#ifdef CONFIG_IWMMXT
+ struct iwmmxt_sigframe iwmmxt;
+#endif
+#ifdef CONFIG_VFP
+ union vfp_state vfp;
+#endif
+};
+
+/*
+ * Do a signal return; undo the signal stack. These are aligned to 64-bit.
+ */
+struct sigframe {
+ struct sigcontext sc;
+ unsigned long extramask[_NSIG_WORDS-1];
+ unsigned long retcode;
+ struct aux_sigframe aux __attribute__((aligned(8)));
+};
+
+struct rt_sigframe {
+ struct siginfo __user *pinfo;
+ void __user *puc;
+ struct siginfo info;
+ struct ucontext uc;
+ unsigned long retcode;
+ struct aux_sigframe aux __attribute__((aligned(8)));
+};
+
static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
+ struct aux_sigframe __user *aux)
{
int err = 0;
err |= !valid_user_regs(regs);
+#ifdef CONFIG_IWMMXT
+ if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
+ err |= restore_iwmmxt_context(&aux->iwmmxt);
+#endif
+#ifdef CONFIG_VFP
+// if (err == 0)
+// err |= vfp_restore_state(&aux->vfp);
+#endif
+
return err;
}
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (restore_sigcontext(regs, &frame->sc))
- goto badframe;
-
-#ifdef CONFIG_IWMMXT
- if (test_thread_flag(TIF_USING_IWMMXT) && restore_iwmmxt_context(frame+1))
+ if (restore_sigcontext(regs, &frame->sc, &frame->aux))
goto badframe;
-#endif
/* Send SIGTRAP if we're single-stepping */
if (current->ptrace & PT_SINGLESTEP) {
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &frame->aux))
goto badframe;
if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
goto badframe;
-#ifdef CONFIG_IWMMXT
- if (test_thread_flag(TIF_USING_IWMMXT) && restore_iwmmxt_context(frame+1))
- goto badframe;
-#endif
-
/* Send SIGTRAP if we're single-stepping */
if (current->ptrace & PT_SINGLESTEP) {
ptrace_cancel_bpt(current);
}
static int
-setup_sigcontext(struct sigcontext __user *sc, /*struct _fpstate *fpstate,*/
+setup_sigcontext(struct sigcontext __user *sc, struct aux_sigframe __user *aux,
struct pt_regs *regs, unsigned long mask)
{
int err = 0;
__put_user_error(current->thread.address, &sc->fault_address, err);
__put_user_error(mask, &sc->oldmask, err);
+#ifdef CONFIG_IWMMXT
+ if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
+ err |= preserve_iwmmxt_context(&aux->iwmmxt);
+#endif
+#ifdef CONFIG_VFP
+// if (err == 0)
+// err |= vfp_save_state(&aux->vfp);
+#endif
+
return err;
}
unsigned long sp = regs->ARM_sp;
void __user *frame;
-#ifdef CONFIG_IWMMXT
- if (test_thread_flag(TIF_USING_IWMMXT))
- framesize = (framesize + 4 + IWMMXT_STORAGE_SIZE) & ~7;
-#endif
-
/*
* This is the X/Open sanctioned signal stack switching.
*/
if (!frame)
return 1;
- err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
+ err |= setup_sigcontext(&frame->sc, &frame->aux, regs, set->sig[0]);
if (_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
}
-#ifdef CONFIG_IWMMXT
- if (test_thread_flag(TIF_USING_IWMMXT))
- err |= preserve_iwmmxt_context(frame+1);
-#endif
-
if (err == 0)
err = setup_return(regs, ka, &frame->retcode, frame, usig);
stack.ss_size = current->sas_ss_size;
err |= __copy_to_user(&frame->uc.uc_stack, &stack, sizeof(stack));
- err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->aux,
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-#ifdef CONFIG_IWMMXT
- if (test_thread_flag(TIF_USING_IWMMXT))
- err |= preserve_iwmmxt_context(frame+1);
-#endif
-
if (err == 0)
err = setup_return(regs, ka, &frame->retcode, frame, usig);
if (!user_mode(regs))
return 0;
- if (current->flags & PF_FREEZE) {
- refrigerator(0);
+ if (try_to_freeze(0))
goto no_signal;
- }
if (current->ptrace & PT_SINGLESTEP)
ptrace_cancel_bpt(current);
git://git.onelab.eu / linux-2.6.git / blobdiff