#include <asm/unistd.h>
#include "ptrace.h"
+#include "signal.h"
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
+/*
+ * With EABI, the syscall number has to be loaded into r7.
+ */
+#define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE))
+#define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
+
/*
* For Thumb syscalls, we pass the syscall number via r7. We therefore
* need two 16-bit instructions.
#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
-static const unsigned long retcodes[4] = {
- SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
- SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
+const unsigned long sigreturn_codes[7] = {
+ MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
+ MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
};
static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
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);
- if (pmd_present(*pmd)) {
- pte_t *pte = pte_offset_map(pmd, addr);
- return (pte_present(*pte) && (!wr || pte_write(*pte)));
- }
- }
- return 0;
-}
-
-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;
+ char kbuf[sizeof(*frame) + 8];
+ struct iwmmxt_sigframe *kframe;
/* the iWMMXt context must be 64 bit aligned */
- WARN_ON((unsigned long)frame & 7);
-
- __put_user_error(IWMMXT_MAGIC0, &frame->magic0, err);
- __put_user_error(IWMMXT_MAGIC1, &frame->magic1, 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.
- */
- err |= copy_locked(&frame->storage, current_thread_info(),
- sizeof(frame->storage), 1, iwmmxt_task_copy);
- return err;
+ kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+ kframe->magic0 = IWMMXT_MAGIC0;
+ kframe->magic1 = IWMMXT_MAGIC1;
+ iwmmxt_task_copy(current_thread_info(), &kframe->storage);
+ return __copy_to_user(frame, kframe, sizeof(*frame));
}
static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
{
- unsigned long magic0, magic1;
- int err = 0;
-
- /* the iWMMXt context is 64 bit aligned */
- WARN_ON((unsigned long)frame & 7);
+ char kbuf[sizeof(*frame) + 8];
+ struct iwmmxt_sigframe *kframe;
- /*
- * Validate iWMMXt context signature.
- * Also, iwmmxt_task_restore() 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.
- */
- __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;
+ /* the iWMMXt context must be 64 bit aligned */
+ kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
+ if (__copy_from_user(kframe, frame, sizeof(*frame)))
+ return -1;
+ if (kframe->magic0 != IWMMXT_MAGIC0 ||
+ kframe->magic1 != IWMMXT_MAGIC1)
+ return -1;
+ iwmmxt_task_restore(current_thread_info(), &kframe->storage);
+ return 0;
}
#endif
struct sigframe {
struct sigcontext sc;
unsigned long extramask[_NSIG_WORDS-1];
- unsigned long retcode;
+ unsigned long retcode[2];
struct aux_sigframe aux __attribute__((aligned(8)));
};
void __user *puc;
struct siginfo info;
struct ucontext uc;
- unsigned long retcode;
+ unsigned long retcode[2];
struct aux_sigframe aux __attribute__((aligned(8)));
};
if (ka->sa.sa_flags & SA_RESTORER) {
retcode = (unsigned long)ka->sa.sa_restorer;
} else {
- unsigned int idx = thumb;
+ unsigned int idx = thumb << 1;
if (ka->sa.sa_flags & SA_SIGINFO)
- idx += 2;
+ idx += 3;
- if (__put_user(retcodes[idx], rc))
+ if (__put_user(sigreturn_codes[idx], rc) ||
+ __put_user(sigreturn_codes[idx+1], rc+1))
return 1;
- /*
- * Ensure that the instruction cache sees
- * the return code written onto the stack.
- */
- flush_icache_range((unsigned long)rc,
- (unsigned long)(rc + 1));
-
- retcode = ((unsigned long)rc) + thumb;
+ if (cpsr & MODE32_BIT) {
+ /*
+ * 32-bit code can use the new high-page
+ * signal return code support.
+ */
+ retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb;
+ } else {
+ /*
+ * Ensure that the instruction cache sees
+ * the return code written onto the stack.
+ */
+ flush_icache_range((unsigned long)rc,
+ (unsigned long)(rc + 2));
+
+ retcode = ((unsigned long)rc) + thumb;
+ }
}
regs->ARM_r0 = usig;
}
if (err == 0)
- err = setup_return(regs, ka, &frame->retcode, frame, usig);
+ err = setup_return(regs, ka, frame->retcode, frame, usig);
return err;
}
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err == 0)
- err = setup_return(regs, ka, &frame->retcode, frame, usig);
+ err = setup_return(regs, ka, frame->retcode, frame, usig);
if (err == 0) {
/*
*/
ret |= !valid_user_regs(regs);
+ if (ret != 0) {
+ force_sigsegv(sig, tsk);
+ return;
+ }
+
/*
- * Block the signal if we were unsuccessful.
+ * Block the signal if we were successful.
*/
- if (ret != 0 || !(ka->sa.sa_flags & SA_NODEFER)) {
- spin_lock_irq(&tsk->sighand->siglock);
- sigorsets(&tsk->blocked, &tsk->blocked,
- &ka->sa.sa_mask);
+ spin_lock_irq(&tsk->sighand->siglock);
+ sigorsets(&tsk->blocked, &tsk->blocked,
+ &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
sigaddset(&tsk->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(&tsk->sighand->siglock);
- }
-
- if (ret == 0)
- return;
+ recalc_sigpending();
+ spin_unlock_irq(&tsk->sighand->siglock);
- force_sigsegv(sig, tsk);
}
/*
if (!user_mode(regs))
return 0;
- if (try_to_freeze(0))
+ if (try_to_freeze())
goto no_signal;
if (current->ptrace & PT_SINGLESTEP)
git://git.onelab.eu / linux-2.6.git / blobdiff