#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
#define TIF_SYSCALL_TRACE 8
#define TIF_SYSCALL_AUDIT 9
+ #define TIF_SYSCALL_RESTARTSYS 10
#define TIF_POLLING_NRFLAG 16
#define TIF_USING_IWMMXT 17
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 20
#define TIF_SECCOMP 21
+#define TIF_SWITCH_MM 22 /* deferred switch_mm */
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
- #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
+ #define _TIF_SYSCALL_RESTARTSYS (1 << TIF_SYSCALL_RESTARTSYS)
/* Checks for any syscall work in entry-common.S */
- #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
+ #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
+ _TIF_SYSCALL_RESTARTSYS)
/*
* Change these and you break ASM code in entry-common.S
*/
- #define _TIF_WORK_MASK 0x000000ff
+ #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */
work_pending:
tst r1, #_TIF_NEED_RESCHED
bne work_resched
- tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME
- beq no_work_pending
+ /*
+ * TIF_SIGPENDING or TIF_NOTIFY_RESUME must've been set if we got here
+ */
+ ldr r2, [sp, #S_PSR]
mov r0, sp @ 'regs'
+ tst r2, #15 @ are we returning to user mode?
+ bne no_work_pending @ no? just leave, then...
mov r2, why @ 'syscall'
tst r1, #_TIF_SIGPENDING @ delivering a signal?
movne why, #0 @ prevent further restarts
*-----------------------------------------------------------------------------
*/
- /* If we're optimising for StrongARM the resulting code won't
- run on an ARM7 and we can save a couple of instructions.
- --pb */
-#ifdef CONFIG_CPU_ARM710
-#define A710(code...) code
-.Larm710bug:
- ldmia sp, {r0 - lr}^ @ Get calling r0 - lr
- mov r0, r0
- add sp, sp, #S_FRAME_SIZE
- subs pc, lr, #4
-#else
-#define A710(code...)
-#endif
-
.align 5
ENTRY(vector_swi)
sub sp, sp, #S_FRAME_SIZE
ldreq r10, [lr, #-4] @ get SWI instruction
#else
ldr r10, [lr, #-4] @ get SWI instruction
- A710( and ip, r10, #0x0f000000 @ check for SWI )
- A710( teq ip, #0x0f000000 )
- A710( bne .Larm710bug )
#endif
#ifdef CONFIG_CPU_ENDIAN_BE8
rev r10, r10 @ little endian instruction
/*
* Pure EABI user space always put syscall number into scno (r7).
*/
- A710( ldr ip, [lr, #-4] @ get SWI instruction )
- A710( and ip, ip, #0x0f000000 @ check for SWI )
- A710( teq ip, #0x0f000000 )
- A710( bne .Larm710bug )
-
#elif defined(CONFIG_ARM_THUMB)
-
/* Legacy ABI only, possibly thumb mode. */
tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
ldreq scno, [lr, #-4]
#else
-
/* Legacy ABI only. */
ldr scno, [lr, #-4] @ get SWI instruction
- A710( and ip, scno, #0x0f000000 @ check for SWI )
- A710( teq ip, #0x0f000000 )
- A710( bne .Larm710bug )
-
#endif
#ifdef CONFIG_ALIGNMENT_TRAP
#include <linux/hw_breakpoint.h>
#include <linux/regset.h>
#include <linux/audit.h>
+#include <linux/tracehook.h>
+ #include <linux/unistd.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0,
regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
+ if (why == 0 && test_and_clear_thread_flag(TIF_SYSCALL_RESTARTSYS))
+ scno = __NR_restart_syscall - __NR_SYSCALL_BASE;
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return scno;
- if (!(current->ptrace & PT_PTRACED))
- return scno;
current_thread_info()->syscall = scno;
*/
ip = regs->ARM_ip;
regs->ARM_ip = why;
- ptrace_report_syscall(regs);
+
+ if (why)
+ tracehook_report_syscall_exit(regs, 0);
+ else if (tracehook_report_syscall_entry(regs))
+ current_thread_info()->syscall = -1;
+
regs->ARM_ip = ip;
return current_thread_info()->syscall;
*/
#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
- #define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
/*
* With EABI, the syscall number has to be loaded into r7.
MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
};
- /*
- * Either we support OABI only, or we have EABI with the OABI
- * compat layer enabled. In the later case we don't know if
- * user space is EABI or not, and if not we must not clobber r7.
- * Always using the OABI syscall solves that issue and works for
- * all those cases.
- */
- const unsigned long syscall_restart_code[2] = {
- SWI_SYS_RESTART, /* swi __NR_restart_syscall */
- 0xe49df004, /* ldr pc, [sp], #4 */
- };
-
/*
* atomically swap in the new signal mask, and wait for a signal.
*/
old_sigset_t mask;
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+ __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+ __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+ __get_user(mask, &act->sa_mask))
return -EFAULT;
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
siginitset(&new_ka.sa.sa_mask, mask);
}
if (!ret && oact) {
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+ __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+ __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+ __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
return -EFAULT;
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
*/
block_sigmask(ka, sig);
+ tracehook_signal_handler(sig, info, ka, regs, 0);
+
return 0;
}
siginfo_t info;
int signr;
- /*
- * We want the common case to go fast, which
- * is why we may in certain cases get here from
- * kernel mode. Just return without doing anything
- * if so.
- */
- if (!user_mode(regs))
- return;
-
/*
* If we were from a system call, check for system call restarting...
*/
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
+ case -ERESTART_RESTARTBLOCK:
regs->ARM_r0 = regs->ARM_ORIG_r0;
regs->ARM_pc = restart_addr;
break;
- case -ERESTART_RESTARTBLOCK:
- regs->ARM_r0 = -EINTR;
- break;
}
}
- if (try_to_freeze())
- goto no_signal;
-
/*
* Get the signal to deliver. When running under ptrace, at this
* point the debugger may change all our registers ...
* debugger has chosen to restart at a different PC.
*/
if (regs->ARM_pc == restart_addr) {
- if (retval == -ERESTARTNOHAND
+ if (retval == -ERESTARTNOHAND ||
+ retval == -ERESTART_RESTARTBLOCK
|| (retval == -ERESTARTSYS
&& !(ka.sa.sa_flags & SA_RESTART))) {
regs->ARM_r0 = -EINTR;
regs->ARM_pc = continue_addr;
}
+ clear_thread_flag(TIF_SYSCALL_RESTARTSYS);
}
if (test_thread_flag(TIF_RESTORE_SIGMASK))
return;
}
- no_signal:
if (syscall) {
/*
* Handle restarting a different system call. As above,
* ignore the restart.
*/
if (retval == -ERESTART_RESTARTBLOCK
- && regs->ARM_pc == continue_addr) {
- if (thumb_mode(regs)) {
- regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE;
- regs->ARM_pc -= 2;
- } else {
- #if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT)
- regs->ARM_r7 = __NR_restart_syscall;
- regs->ARM_pc -= 4;
- #else
- u32 __user *usp;
-
- regs->ARM_sp -= 4;
- usp = (u32 __user *)regs->ARM_sp;
-
- if (put_user(regs->ARM_pc, usp) == 0) {
- regs->ARM_pc = KERN_RESTART_CODE;
- } else {
- regs->ARM_sp += 4;
- force_sigsegv(0, current);
- }
- #endif
- }
- }
-
- /* If there's no signal to deliver, we just put the saved sigmask
- * back.
- */
- if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
- clear_thread_flag(TIF_RESTORE_SIGMASK);
- sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
- }
+ && regs->ARM_pc == restart_addr)
+ set_thread_flag(TIF_SYSCALL_RESTARTSYS);
}
+
+ /* If there's no signal to deliver, we just put the saved sigmask
+ * back.
+ */
+ if (test_and_clear_thread_flag(TIF_RESTORE_SIGMASK))
+ set_current_blocked(¤t->saved_sigmask);
}
asmlinkage void
return regs->ARM_r0;
}
-static inline void
+static inline int
do_cache_op(unsigned long start, unsigned long end, int flags)
{
struct mm_struct *mm = current->active_mm;
struct vm_area_struct *vma;
if (end < start || flags)
- return;
+ return -EINVAL;
down_read(&mm->mmap_sem);
vma = find_vma(mm, start);
if (end > vma->vm_end)
end = vma->vm_end;
- flush_cache_user_range(vma, start, end);
+ up_read(&mm->mmap_sem);
+ return flush_cache_user_range(start, end);
}
up_read(&mm->mmap_sem);
+ return -EINVAL;
}
/*
* the specified region).
*/
case NR(cacheflush):
- do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
- return 0;
+ return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
case NR(usr26):
if (!(elf_hwcap & HWCAP_26BIT))
*/
memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE),
sigreturn_codes, sizeof(sigreturn_codes));
- memcpy((void *)(vectors + KERN_RESTART_CODE - CONFIG_VECTORS_BASE),
- syscall_restart_code, sizeof(syscall_restart_code));
flush_icache_range(vectors, vectors + PAGE_SIZE);
modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
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