Merge ../linux-2.6 by hand

1 files changed, 56 insertions, 87 deletions

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 0209c1dd1429..9202a17db8f7 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -8,6 +8,7 @@
  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  */
 #include <linux/config.h>
+#include <linux/cache.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/personality.h>
@@ -21,6 +22,7 @@
 #include <linux/unistd.h>
 #include <linux/compiler.h>
 
+#include <asm/abi.h>
 #include <asm/asm.h>
 #include <linux/bitops.h>
 #include <asm/cacheflush.h>
@@ -29,6 +31,7 @@
 #include <asm/uaccess.h>
 #include <asm/ucontext.h>
 #include <asm/cpu-features.h>
+#include <asm/war.h>
 
 #include "signal-common.h"
 
@@ -36,7 +39,7 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-static int do_signal(sigset_t *oldset, struct pt_regs *regs);
+int do_signal(sigset_t *oldset, struct pt_regs *regs);
 
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
@@ -47,9 +50,10 @@ save_static_function(sys_sigsuspend);
 __attribute_used__ noinline static int
 _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
 {
-        sigset_t *uset, saveset, newset;
+        sigset_t saveset, newset;
+        sigset_t __user *uset;
 
-        uset = (sigset_t *) regs.regs[4];
+        uset = (sigset_t __user *) regs.regs[4];
         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
                 return -EFAULT;
         sigdelsetmask(&newset, ~_BLOCKABLE);
@@ -75,7 +79,8 @@ save_static_function(sys_rt_sigsuspend);
 __attribute_used__ noinline static int
 _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
 {
-        sigset_t *unewset, saveset, newset;
+        sigset_t saveset, newset;
+        sigset_t __user *unewset;
         size_t sigsetsize;
 
         /* XXX Don't preclude handling different sized sigset_t's.  */
@@ -83,7 +88,7 @@ _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
         if (sigsetsize != sizeof(sigset_t))
                 return -EINVAL;
 
-        unewset = (sigset_t *) regs.regs[4];
+        unewset = (sigset_t __user *) regs.regs[4];
         if (copy_from_user(&newset, unewset, sizeof(newset)))
                 return -EFAULT;
         sigdelsetmask(&newset, ~_BLOCKABLE);
@@ -147,33 +152,46 @@ asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
 
 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
 {
-        const stack_t *uss = (const stack_t *) regs.regs[4];
-        stack_t *uoss = (stack_t *) regs.regs[5];
+        const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
+        stack_t __user *uoss = (stack_t __user *) regs.regs[5];
         unsigned long usp = regs.regs[29];
 
         return do_sigaltstack(uss, uoss, usp);
 }
 
-#if PLAT_TRAMPOLINE_STUFF_LINE
-#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
-#else
-#define __tramp
-#endif
-
+/*
+ * Horribly complicated - with the bloody RM9000 workarounds enabled
+ * the signal trampolines is moving to the end of the structure so we can
+ * increase the alignment without breaking software compatibility.
+ */
 #ifdef CONFIG_TRAD_SIGNALS
 struct sigframe {
         u32 sf_ass[4];                  /* argument save space for o32 */
-        u32 sf_code[2] __tramp;         /* signal trampoline */
-        struct sigcontext sf_sc __tramp;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+        u32 sf_pad[2];
+#else
+        u32 sf_code[2];                 /* signal trampoline */
+#endif
+        struct sigcontext sf_sc;
         sigset_t sf_mask;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+        u32 sf_code[8] ____cacheline_aligned;   /* signal trampoline */
+#endif
 };
 #endif
 
 struct rt_sigframe {
         u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_code[2] __tramp;         /* signal trampoline */
-        struct siginfo rs_info __tramp;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+        u32 rs_pad[2];
+#else
+        u32 rs_code[2];                 /* signal trampoline */
+#endif
+        struct siginfo rs_info;
         struct ucontext rs_uc;
+#if ICACHE_REFILLS_WORKAROUND_WAR
+        u32 rs_code[8] ____cacheline_aligned;   /* signal trampoline */
+#endif
 };
 
 #ifdef CONFIG_TRAD_SIGNALS
@@ -214,7 +232,7 @@ _sys_sigreturn(nabi_no_regargs struct pt_regs regs)
 badframe:
         force_sig(SIGSEGV, current);
 }
-#endif
+#endif /* CONFIG_TRAD_SIGNALS */
 
 save_static_function(sys_rt_sigreturn);
 __attribute_used__ noinline static void
@@ -260,7 +278,7 @@ badframe:
 }
 
 #ifdef CONFIG_TRAD_SIGNALS
-static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
         int signr, sigset_t *set)
 {
         struct sigframe *frame;
@@ -270,17 +288,7 @@ static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        /*
-         * Set up the return code ...
-         *
-         *         li      v0, __NR_sigreturn
-         *         syscall
-         */
-        if (PLAT_TRAMPOLINE_STUFF_LINE)
-                __clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
-        err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
-        err |= __put_user(0x0000000c                 , frame->sf_code + 1);
-        flush_cache_sigtramp((unsigned long) frame->sf_code);
+        install_sigtramp(frame->sf_code, __NR_sigreturn);
 
         err |= setup_sigcontext(regs, &frame->sf_sc);
         err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
@@ -309,14 +317,15 @@ static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
                current->comm, current->pid,
                frame, regs->cp0_epc, frame->regs[31]);
 #endif
-        return;
+        return 1;
 
 give_sigsegv:
         force_sigsegv(signr, current);
+        return 0;
 }
 #endif
 
-static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
         int signr, sigset_t *set, siginfo_t *info)
 {
         struct rt_sigframe *frame;
@@ -326,17 +335,7 @@ static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        /*
-         * Set up the return code ...
-         *
-         *         li      v0, __NR_rt_sigreturn
-         *         syscall
-         */
-        if (PLAT_TRAMPOLINE_STUFF_LINE)
-                __clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
-        err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
-        err |= __put_user(0x0000000c                    , frame->rs_code + 1);
-        flush_cache_sigtramp((unsigned long) frame->rs_code);
+        install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
 
         /* Create siginfo.  */
         err |= copy_siginfo_to_user(&frame->rs_info, info);
@@ -378,18 +377,21 @@ static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
                current->comm, current->pid,
                frame, regs->cp0_epc, regs->regs[31]);
 #endif
-        return;
+        return 1;
 
 give_sigsegv:
         force_sigsegv(signr, current);
+        return 0;
 }
 
 extern void setup_rt_frame_n32(struct k_sigaction * ka,
         struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
 
-static inline void handle_signal(unsigned long sig, siginfo_t *info,
+static inline int handle_signal(unsigned long sig, siginfo_t *info,
         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
 {
+        int ret;
+
         switch(regs->regs[0]) {
         case ERESTART_RESTARTBLOCK:
         case ERESTARTNOHAND:
@@ -408,22 +410,10 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
 
         regs->regs[0] = 0;              /* Don't deal with this again.  */
 
-#ifdef CONFIG_TRAD_SIGNALS
-        if (ka->sa.sa_flags & SA_SIGINFO) {
-#else
-        if (1) {
-#endif
-#ifdef CONFIG_MIPS32_N32
-                if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
-                        setup_rt_frame_n32 (ka, regs, sig, oldset, info);
-                else
-#endif
-                        setup_rt_frame(ka, regs, sig, oldset, info);
-        }
-#ifdef CONFIG_TRAD_SIGNALS
+        if (sig_uses_siginfo(ka))
+                ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
         else
-                setup_frame(ka, regs, sig, oldset);
-#endif
+                ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
 
         spin_lock_irq(&current->sighand->siglock);
         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
@@ -431,23 +421,16 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
                 sigaddset(&current->blocked,sig);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
-}
 
-extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
-extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
+        return ret;
+}
 
-static int do_signal(sigset_t *oldset, struct pt_regs *regs)
+int do_signal(sigset_t *oldset, struct pt_regs *regs)
 {
         struct k_sigaction ka;
         siginfo_t info;
         int signr;
 
-#ifdef CONFIG_BINFMT_ELF32
-        if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
-                return do_signal32(oldset, regs);
-        }
-#endif
-
         /*
          * 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
@@ -463,10 +446,8 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs)
                 oldset = &current->blocked;
 
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-        if (signr > 0) {
-                handle_signal(signr, &info, &ka, oldset, regs);
-                return 1;
-        }
+        if (signr > 0)
+                return handle_signal(signr, &info, &ka, oldset, regs);
 
 no_signal:
         /*
@@ -499,18 +480,6 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
 {
         /* deal with pending signal delivery */
         if (thread_info_flags & _TIF_SIGPENDING) {
-#ifdef CONFIG_BINFMT_ELF32
-                if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
-                        do_signal32(oldset, regs);
-                        return;
-                }
-#endif
-#ifdef CONFIG_BINFMT_IRIX
-                if (unlikely(current->personality != PER_LINUX)) {
-                        do_irix_signal(oldset, regs);
-                        return;
-                }
-#endif
-                do_signal(oldset, regs);
+                current->thread.abi->do_signal(oldset, regs);
         }
 }