5 files changed, 43 insertions, 135 deletions

diff --git a/arch/mips/include/asm/abi.h b/arch/mips/include/asm/abi.h
index 1dd74fbdc09b..9252d9b50e59 100644
--- a/arch/mips/include/asm/abi.h
+++ b/arch/mips/include/asm/abi.h
@@ -13,12 +13,14 @@
 #include <asm/siginfo.h>
 
 struct mips_abi {
-        int (* const setup_frame)(struct k_sigaction * ka,
+        int (* const setup_frame)(void *sig_return, struct k_sigaction *ka,
                                   struct pt_regs *regs, int signr,
                                   sigset_t *set);
-        int (* const setup_rt_frame)(struct k_sigaction * ka,
+        const unsigned long     signal_return_offset;
+        int (* const setup_rt_frame)(void *sig_return, struct k_sigaction *ka,
                                struct pt_regs *regs, int signr,
                                sigset_t *set, siginfo_t *info);
+        const unsigned long     rt_signal_return_offset;
         const unsigned long     restart;
 };
 
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index 6c8e8c4246f7..10263b405981 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -26,11 +26,6 @@
  */
 extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
                                  size_t frame_size);
-/*
- * install trampoline code to get back from the sig handler
- */
-extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
-
 /* Check and clear pending FPU exceptions in saved CSR */
 extern int fpcsr_pending(unsigned int __user *fpcsr);
 
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index d0c68b5d717b..2099d5a4c4b7 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -32,6 +32,7 @@
 #include <asm/ucontext.h>
 #include <asm/cpu-features.h>
 #include <asm/war.h>
+#include <asm/vdso.h>
 
 #include "signal-common.h"
 
@@ -44,47 +45,20 @@ extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
 extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
 extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
 
-/*
- * 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.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
 struct sigframe {
         u32 sf_ass[4];          /* argument save space for o32 */
-        u32 sf_code[2];         /* signal trampoline */
+        u32 sf_pad[2];          /* Was: signal trampoline */
         struct sigcontext sf_sc;
         sigset_t sf_mask;
 };
 
 struct rt_sigframe {
         u32 rs_ass[4];          /* argument save space for o32 */
-        u32 rs_code[2];         /* signal trampoline */
+        u32 rs_pad[2];          /* Was: signal trampoline */
         struct siginfo rs_info;
         struct ucontext rs_uc;
 };
 
-#else
-
-struct sigframe {
-        u32 sf_ass[4];                  /* argument save space for o32 */
-        u32 sf_pad[2];
-        struct sigcontext sf_sc;        /* hw context */
-        sigset_t sf_mask;
-        u32 sf_code[8] ____cacheline_aligned;   /* signal trampoline */
-};
-
-struct rt_sigframe {
-        u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_pad[2];
-        struct siginfo rs_info;
-        struct ucontext rs_uc;
-        u32 rs_code[8] ____cacheline_aligned;   /* signal trampoline */
-};
-
-#endif
-
 /*
  * Helper routines
  */
@@ -266,32 +240,6 @@ void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
         return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
 }
 
-int install_sigtramp(unsigned int __user *tramp, unsigned int syscall)
-{
-        int err;
-
-        /*
-         * Set up the return code ...
-         *
-         *         li      v0, __NR__foo_sigreturn
-         *         syscall
-         */
-
-        err = __put_user(0x24020000 + syscall, tramp + 0);
-        err |= __put_user(0x0000000c         , tramp + 1);
-        if (ICACHE_REFILLS_WORKAROUND_WAR) {
-                err |= __put_user(0, tramp + 2);
-                err |= __put_user(0, tramp + 3);
-                err |= __put_user(0, tramp + 4);
-                err |= __put_user(0, tramp + 5);
-                err |= __put_user(0, tramp + 6);
-                err |= __put_user(0, tramp + 7);
-        }
-        flush_cache_sigtramp((unsigned long) tramp);
-
-        return err;
-}
-
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
  */
@@ -484,8 +432,8 @@ badframe:
 }
 
 #ifdef CONFIG_TRAD_SIGNALS
-static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
-        int signr, sigset_t *set)
+static int setup_frame(void *sig_return, struct k_sigaction *ka,
+                       struct pt_regs *regs, int signr, sigset_t *set)
 {
         struct sigframe __user *frame;
         int err = 0;
@@ -494,8 +442,6 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        err |= install_sigtramp(frame->sf_code, __NR_sigreturn);
-
         err |= setup_sigcontext(regs, &frame->sf_sc);
         err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
         if (err)
@@ -515,7 +461,7 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
         regs->regs[ 5] = 0;
         regs->regs[ 6] = (unsigned long) &frame->sf_sc;
         regs->regs[29] = (unsigned long) frame;
-        regs->regs[31] = (unsigned long) frame->sf_code;
+        regs->regs[31] = (unsigned long) sig_return;
         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
 
         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -529,8 +475,9 @@ give_sigsegv:
 }
 #endif
 
-static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
-        int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
+                          struct pt_regs *regs, int signr, sigset_t *set,
+                          siginfo_t *info)
 {
         struct rt_sigframe __user *frame;
         int err = 0;
@@ -539,8 +486,6 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
-
         /* Create siginfo.  */
         err |= copy_siginfo_to_user(&frame->rs_info, info);
 
@@ -573,7 +518,7 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
         regs->regs[ 5] = (unsigned long) &frame->rs_info;
         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
         regs->regs[29] = (unsigned long) frame;
-        regs->regs[31] = (unsigned long) frame->rs_code;
+        regs->regs[31] = (unsigned long) sig_return;
         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
 
         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -590,8 +535,11 @@ give_sigsegv:
 struct mips_abi mips_abi = {
 #ifdef CONFIG_TRAD_SIGNALS
         .setup_frame    = setup_frame,
+        .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
 #endif
         .setup_rt_frame = setup_rt_frame,
+        .rt_signal_return_offset =
+                offsetof(struct mips_vdso, rt_signal_trampoline),
         .restart        = __NR_restart_syscall
 };
 
@@ -599,6 +547,8 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
 {
         int ret;
+        struct mips_abi *abi = current->thread.abi;
+        void *vdso = current->mm->context.vdso;
 
         switch(regs->regs[0]) {
         case ERESTART_RESTARTBLOCK:
@@ -619,9 +569,11 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
         regs->regs[0] = 0;              /* Don't deal with this again.  */
 
         if (sig_uses_siginfo(ka))
-                ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
+                ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
+                                          ka, regs, sig, oldset, info);
         else
-                ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
+                ret = abi->setup_frame(vdso + abi->signal_return_offset,
+                                       ka, regs, sig, oldset);
 
         spin_lock_irq(&current->sighand->siglock);
         sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 03abaf048f09..a0ed0e052b2e 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -32,6 +32,7 @@
 #include <asm/system.h>
 #include <asm/fpu.h>
 #include <asm/war.h>
+#include <asm/vdso.h>
 
 #include "signal-common.h"
 
@@ -47,8 +48,6 @@ extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user
 /*
  * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
  */
-#define __NR_O32_sigreturn              4119
-#define __NR_O32_rt_sigreturn           4193
 #define __NR_O32_restart_syscall        4253
 
 /* 32-bit compatibility types */
@@ -77,47 +76,20 @@ struct ucontext32 {
         compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 };
 
-/*
- * 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.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
 struct sigframe32 {
         u32 sf_ass[4];          /* argument save space for o32 */
-        u32 sf_code[2];         /* signal trampoline */
+        u32 sf_pad[2];          /* Was: signal trampoline */
         struct sigcontext32 sf_sc;
         compat_sigset_t sf_mask;
 };
 
 struct rt_sigframe32 {
         u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_code[2];                 /* signal trampoline */
+        u32 rs_pad[2];                  /* Was: signal trampoline */
         compat_siginfo_t rs_info;
         struct ucontext32 rs_uc;
 };
 
-#else  /* ICACHE_REFILLS_WORKAROUND_WAR */
-
-struct sigframe32 {
-        u32 sf_ass[4];                  /* argument save space for o32 */
-        u32 sf_pad[2];
-        struct sigcontext32 sf_sc;      /* hw context */
-        compat_sigset_t sf_mask;
-        u32 sf_code[8] ____cacheline_aligned;   /* signal trampoline */
-};
-
-struct rt_sigframe32 {
-        u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_pad[2];
-        compat_siginfo_t rs_info;
-        struct ucontext32 rs_uc;
-        u32 rs_code[8] __attribute__((aligned(32)));    /* signal trampoline */
-};
-
-#endif  /* !ICACHE_REFILLS_WORKAROUND_WAR */
-
 /*
  * sigcontext handlers
  */
@@ -598,8 +570,8 @@ badframe:
         force_sig(SIGSEGV, current);
 }
 
-static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
-        int signr, sigset_t *set)
+static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
+                          struct pt_regs *regs, int signr, sigset_t *set)
 {
         struct sigframe32 __user *frame;
         int err = 0;
@@ -608,8 +580,6 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn);
-
         err |= setup_sigcontext32(regs, &frame->sf_sc);
         err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
 
@@ -630,7 +600,7 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
         regs->regs[ 5] = 0;
         regs->regs[ 6] = (unsigned long) &frame->sf_sc;
         regs->regs[29] = (unsigned long) frame;
-        regs->regs[31] = (unsigned long) frame->sf_code;
+        regs->regs[31] = (unsigned long) sig_return;
         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
 
         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -644,8 +614,9 @@ give_sigsegv:
         return -EFAULT;
 }
 
-static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
-        int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
+                             struct pt_regs *regs, int signr, sigset_t *set,
+                             siginfo_t *info)
 {
         struct rt_sigframe32 __user *frame;
         int err = 0;
@@ -655,8 +626,6 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        err |= install_sigtramp(frame->rs_code, __NR_O32_rt_sigreturn);
-
         /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
         err |= copy_siginfo_to_user32(&frame->rs_info, info);
 
@@ -690,7 +659,7 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
         regs->regs[ 5] = (unsigned long) &frame->rs_info;
         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
         regs->regs[29] = (unsigned long) frame;
-        regs->regs[31] = (unsigned long) frame->rs_code;
+        regs->regs[31] = (unsigned long) sig_return;
         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
 
         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -709,7 +678,11 @@ give_sigsegv:
  */
 struct mips_abi mips_abi_32 = {
         .setup_frame    = setup_frame_32,
+        .signal_return_offset =
+                offsetof(struct mips_vdso, o32_signal_trampoline),
         .setup_rt_frame = setup_rt_frame_32,
+        .rt_signal_return_offset =
+                offsetof(struct mips_vdso, o32_rt_signal_trampoline),
         .restart        = __NR_O32_restart_syscall
 };
 
diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
index bb277e82d421..2c5df818c65a 100644
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -39,13 +39,13 @@
 #include <asm/fpu.h>
 #include <asm/cpu-features.h>
 #include <asm/war.h>
+#include <asm/vdso.h>
 
 #include "signal-common.h"
 
 /*
  * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
  */
-#define __NR_N32_rt_sigreturn           6211
 #define __NR_N32_restart_syscall        6214
 
 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
@@ -67,27 +67,13 @@ struct ucontextn32 {
         compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 };
 
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
-struct rt_sigframe_n32 {
-        u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_code[2];                 /* signal trampoline */
-        struct compat_siginfo rs_info;
-        struct ucontextn32 rs_uc;
-};
-
-#else  /* ICACHE_REFILLS_WORKAROUND_WAR */
-
 struct rt_sigframe_n32 {
         u32 rs_ass[4];                  /* argument save space for o32 */
-        u32 rs_pad[2];
+        u32 rs_pad[2];                  /* Was: signal trampoline */
         struct compat_siginfo rs_info;
         struct ucontextn32 rs_uc;
-        u32 rs_code[8] ____cacheline_aligned;           /* signal trampoline */
 };
 
-#endif  /* !ICACHE_REFILLS_WORKAROUND_WAR */
-
 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
 
 asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
@@ -173,7 +159,7 @@ badframe:
         force_sig(SIGSEGV, current);
 }
 
-static int setup_rt_frame_n32(struct k_sigaction * ka,
+static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka,
         struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
 {
         struct rt_sigframe_n32 __user *frame;
@@ -184,8 +170,6 @@ static int setup_rt_frame_n32(struct k_sigaction * ka,
         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
                 goto give_sigsegv;
 
-        install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
-
         /* Create siginfo.  */
         err |= copy_siginfo_to_user32(&frame->rs_info, info);
 
@@ -219,7 +203,7 @@ static int setup_rt_frame_n32(struct k_sigaction * ka,
         regs->regs[ 5] = (unsigned long) &frame->rs_info;
         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
         regs->regs[29] = (unsigned long) frame;
-        regs->regs[31] = (unsigned long) frame->rs_code;
+        regs->regs[31] = (unsigned long) sig_return;
         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
 
         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -235,5 +219,7 @@ give_sigsegv:
 
 struct mips_abi mips_abi_n32 = {
         .setup_rt_frame = setup_rt_frame_n32,
+        .rt_signal_return_offset =
+                offsetof(struct mips_vdso, n32_rt_signal_trampoline),
         .restart        = __NR_N32_restart_syscall
 };