#include <linux/binfmts.h>
#include <linux/freezer.h>
#include <linux/io.h>
+#include <linux/tracehook.h>
#include <asm/system.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
+#include <asm/syscalls.h>
+#include <asm/fpu.h>
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+struct fdpic_func_descriptor {
+ unsigned long text;
+ unsigned long GOT;
+};
+
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
sigset_t set;
int r0;
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
sigset_t set;
- stack_t st;
int r0;
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
goto badframe;
- if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL,
+ regs->regs[15]) == -EFAULT)
goto badframe;
- /* It is more difficult to avoid calling this function than to
- call it and ignore errors. */
- do_sigaltstack((const stack_t __user *)&st, NULL, (unsigned long)frame);
return r0;
err |= __put_user(OR_R0_R0, &frame->retcode[6]);
err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
regs->pr = (unsigned long) frame->retcode;
+ flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
}
if (err)
regs->regs[4] = signal; /* Arg for signal handler */
regs->regs[5] = 0;
regs->regs[6] = (unsigned long) &frame->sc;
- regs->pc = (unsigned long) ka->sa.sa_handler;
+
+ if (current->personality & FDPIC_FUNCPTRS) {
+ struct fdpic_func_descriptor __user *funcptr =
+ (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
+
+ __get_user(regs->pc, &funcptr->text);
+ __get_user(regs->regs[12], &funcptr->GOT);
+ } else
+ regs->pc = (unsigned long)ka->sa.sa_handler;
set_fs(USER_DS);
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
- flush_cache_sigtramp(regs->pr);
-
- if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
- flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
-
return 0;
give_sigsegv:
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
+ err |= __put_user(NULL, &frame->uc.uc_link);
err |= __put_user((void *)current->sas_ss_sp,
&frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->regs[15]),
regs->regs[4] = signal; /* Arg for signal handler */
regs->regs[5] = (unsigned long) &frame->info;
regs->regs[6] = (unsigned long) &frame->uc;
- regs->pc = (unsigned long) ka->sa.sa_handler;
+
+ if (current->personality & FDPIC_FUNCPTRS) {
+ struct fdpic_func_descriptor __user *funcptr =
+ (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
+
+ __get_user(regs->pc, &funcptr->text);
+ __get_user(regs->regs[12], &funcptr->GOT);
+ } else
+ regs->pc = (unsigned long)ka->sa.sa_handler;
set_fs(USER_DS);
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
- flush_cache_sigtramp(regs->pr);
-
- if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
- flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
+ flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
return 0;
return -EFAULT;
}
+static inline void
+handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
+ struct sigaction *sa)
+{
+ /* If we're not from a syscall, bail out */
+ if (regs->tra < 0)
+ return;
+
+ /* check for system call restart.. */
+ switch (regs->regs[0]) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ no_system_call_restart:
+ regs->regs[0] = -EINTR;
+ regs->sr |= 1;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(sa->sa_flags & SA_RESTART))
+ goto no_system_call_restart;
+ /* fallthrough */
+ case -ERESTARTNOINTR:
+ regs->regs[0] = save_r0;
+ regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
+ break;
+ }
+}
+
/*
* OK, we're invoking a handler
*/
-
static int
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
{
int ret;
- /* Are we from a system call? */
- if (regs->tra >= 0) {
- /* If so, check system call restarting.. */
- switch (regs->regs[0]) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->regs[0] = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->regs[0] = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- regs->regs[0] = save_r0;
- regs->pc -= instruction_size(
- ctrl_inw(regs->pc - 4));
- break;
- }
- }
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
+ if (regs->sr & 1)
+ handle_syscall_restart(save_r0, regs, &ka.sa);
+
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &ka, &info, oldset,
regs, save_r0) == 0) {
* clear the TIF_RESTORE_SIGMASK flag */
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
+
+ tracehook_signal_handler(signr, &info, &ka, regs,
+ test_thread_flag(TIF_SINGLESTEP));
}
return;
}
- no_signal:
+no_signal:
/* Did we come from a system call? */
if (regs->tra >= 0) {
/* Restart the system call - no handlers present */
}
asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
- __u32 thread_info_flags)
+ unsigned long thread_info_flags)
{
/* deal with pending signal delivery */
- if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs, save_r0);
+
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ tracehook_notify_resume(regs);
+ }
}
projects / linux-2.6-omap-h63xx.git / blobdiff