x86, signal: Cleanup ifdefs and is_ia32, is_x32

Use config_enabled() to cleanup the definitions of is_ia32/is_x32. Move
the function prototypes to the header file to cleanup ifdefs,
and move the x32_setup_rt_frame() code around.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1343171129-2747-2-git-send-email-suresh.b.siddha@intel.com
Merged in compilation fix from,
Link: http://lkml.kernel.org/r/1344544736.8326.17.camel@sbsiddha-desk.sc.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 75f4c6d..6f59543 100644 (file)
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -12,6 +12,7 @@
 
 #include <linux/kernel_stat.h>
 #include <linux/regset.h>
+#include <linux/compat.h>
 #include <linux/slab.h>
 #include <asm/asm.h>
 #include <asm/cpufeature.h>
@@ -32,7 +33,6 @@ extern user_regset_get_fn fpregs_get, xfpregs_get, fpregs_soft_get,
 extern user_regset_set_fn fpregs_set, xfpregs_set, fpregs_soft_set,
                                 xstateregs_set;
 
-
 /*
  * xstateregs_active == fpregs_active. Please refer to the comment
  * at the definition of fpregs_active.
@@ -55,6 +55,22 @@ extern void finit_soft_fpu(struct i387_soft_struct *soft);
 static inline void finit_soft_fpu(struct i387_soft_struct *soft) {}
 #endif
 
+static inline int is_ia32_compat_frame(void)
+{
+       return config_enabled(CONFIG_IA32_EMULATION) &&
+              test_thread_flag(TIF_IA32);
+}
+
+static inline int is_ia32_frame(void)
+{
+       return config_enabled(CONFIG_X86_32) || is_ia32_compat_frame();
+}
+
+static inline int is_x32_frame(void)
+{
+       return config_enabled(CONFIG_X86_X32_ABI) && test_thread_flag(TIF_X32);
+}
+
 #define X87_FSW_ES (1 << 7)    /* Exception Summary */
 
 static __always_inline __pure bool use_xsaveopt(void)
@@ -180,6 +196,11 @@ static inline void fpu_fxsave(struct fpu *fpu)
 #endif
 }
 
+int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+                       compat_sigset_t *set, struct pt_regs *regs);
+int ia32_setup_frame(int sig, struct k_sigaction *ka,
+                    compat_sigset_t *set, struct pt_regs *regs);
+
 #else  /* CONFIG_X86_32 */
 
 /* perform fxrstor iff the processor has extended states, otherwise frstor */
@@ -204,6 +225,9 @@ static inline void fpu_fxsave(struct fpu *fpu)
                     : [fx] "=m" (fpu->state->fxsave));
 }
 
+#define ia32_setup_frame       __setup_frame
+#define ia32_setup_rt_frame    __setup_rt_frame
+
 #endif /* CONFIG_X86_64 */
 
 /*

diff --git a/arch/x86/include/asm/signal.h b/arch/x86/include/asm/signal.h
index 598457c..323973f 100644 (file)
--- a/arch/x86/include/asm/signal.h
+++ b/arch/x86/include/asm/signal.h
@@ -31,6 +31,10 @@ typedef struct {
        unsigned long sig[_NSIG_WORDS];
 } sigset_t;
 
+#ifndef CONFIG_COMPAT
+typedef sigset_t compat_sigset_t;
+#endif
+
 #else
 /* Here we must cater to libcs that poke about in kernel headers.  */
 

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index b280908..bed431a 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -209,24 +209,21 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
        unsigned long sp = regs->sp;
        int onsigstack = on_sig_stack(sp);
 
-#ifdef CONFIG_X86_64
        /* redzone */
-       sp -= 128;
-#endif /* CONFIG_X86_64 */
+       if (config_enabled(CONFIG_X86_64))
+               sp -= 128;
 
        if (!onsigstack) {
                /* This is the X/Open sanctioned signal stack switching.  */
                if (ka->sa.sa_flags & SA_ONSTACK) {
                        if (current->sas_ss_size)
                                sp = current->sas_ss_sp + current->sas_ss_size;
-               } else {
-#ifdef CONFIG_X86_32
-                       /* This is the legacy signal stack switching. */
-                       if ((regs->ss & 0xffff) != __USER_DS &&
-                               !(ka->sa.sa_flags & SA_RESTORER) &&
-                                       ka->sa.sa_restorer)
+               } else if (config_enabled(CONFIG_X86_32) &&
+                          (regs->ss & 0xffff) != __USER_DS &&
+                          !(ka->sa.sa_flags & SA_RESTORER) &&
+                          ka->sa.sa_restorer) {
+                               /* This is the legacy signal stack switching. */
                                sp = (unsigned long) ka->sa.sa_restorer;
-#endif /* CONFIG_X86_32 */
                }
        }
 
@@ -474,6 +471,74 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 }
 #endif /* CONFIG_X86_32 */
 
+static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
+                             siginfo_t *info, compat_sigset_t *set,
+                             struct pt_regs *regs)
+{
+#ifdef CONFIG_X86_X32_ABI
+       struct rt_sigframe_x32 __user *frame;
+       void __user *restorer;
+       int err = 0;
+       void __user *fpstate = NULL;
+
+       frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+
+       if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+               return -EFAULT;
+
+       if (ka->sa.sa_flags & SA_SIGINFO) {
+               if (copy_siginfo_to_user32(&frame->info, info))
+                       return -EFAULT;
+       }
+
+       put_user_try {
+               /* Create the ucontext.  */
+               if (cpu_has_xsave)
+                       put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
+               else
+                       put_user_ex(0, &frame->uc.uc_flags);
+               put_user_ex(0, &frame->uc.uc_link);
+               put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+               put_user_ex(sas_ss_flags(regs->sp),
+                           &frame->uc.uc_stack.ss_flags);
+               put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+               put_user_ex(0, &frame->uc.uc__pad0);
+               err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+                                       regs, set->sig[0]);
+               err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+               if (ka->sa.sa_flags & SA_RESTORER) {
+                       restorer = ka->sa.sa_restorer;
+               } else {
+                       /* could use a vstub here */
+                       restorer = NULL;
+                       err |= -EFAULT;
+               }
+               put_user_ex(restorer, &frame->pretcode);
+       } put_user_catch(err);
+
+       if (err)
+               return -EFAULT;
+
+       /* Set up registers for signal handler */
+       regs->sp = (unsigned long) frame;
+       regs->ip = (unsigned long) ka->sa.sa_handler;
+
+       /* We use the x32 calling convention here... */
+       regs->di = sig;
+       regs->si = (unsigned long) &frame->info;
+       regs->dx = (unsigned long) &frame->uc;
+
+       loadsegment(ds, __USER_DS);
+       loadsegment(es, __USER_DS);
+
+       regs->cs = __USER_CS;
+       regs->ss = __USER_DS;
+#endif /* CONFIG_X86_X32_ABI */
+
+       return 0;
+}
+
 #ifdef CONFIG_X86_32
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
@@ -612,55 +677,22 @@ static int signr_convert(int sig)
        return sig;
 }
 
-#ifdef CONFIG_X86_32
-
-#define is_ia32        1
-#define ia32_setup_frame       __setup_frame
-#define ia32_setup_rt_frame    __setup_rt_frame
-
-#else /* !CONFIG_X86_32 */
-
-#ifdef CONFIG_IA32_EMULATION
-#define is_ia32        test_thread_flag(TIF_IA32)
-#else /* !CONFIG_IA32_EMULATION */
-#define is_ia32        0
-#endif /* CONFIG_IA32_EMULATION */
-
-#ifdef CONFIG_X86_X32_ABI
-#define is_x32 test_thread_flag(TIF_X32)
-
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-                             siginfo_t *info, compat_sigset_t *set,
-                             struct pt_regs *regs);
-#else /* !CONFIG_X86_X32_ABI */
-#define is_x32 0
-#endif /* CONFIG_X86_X32_ABI */
-
-int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-               sigset_t *set, struct pt_regs *regs);
-int ia32_setup_frame(int sig, struct k_sigaction *ka,
-               sigset_t *set, struct pt_regs *regs);
-
-#endif /* CONFIG_X86_32 */
-
 static int
 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                struct pt_regs *regs)
 {
        int usig = signr_convert(sig);
        sigset_t *set = sigmask_to_save();
+       compat_sigset_t *cset = (compat_sigset_t *) set;
 
        /* Set up the stack frame */
-       if (is_ia32) {
+       if (is_ia32_frame()) {
                if (ka->sa.sa_flags & SA_SIGINFO)
-                       return ia32_setup_rt_frame(usig, ka, info, set, regs);
+                       return ia32_setup_rt_frame(usig, ka, info, cset, regs);
                else
-                       return ia32_setup_frame(usig, ka, set, regs);
-#ifdef CONFIG_X86_X32_ABI
-       } else if (is_x32) {
-               return x32_setup_rt_frame(usig, ka, info,
-                                        (compat_sigset_t *)set, regs);
-#endif
+                       return ia32_setup_frame(usig, ka, cset, regs);
+       } else if (is_x32_frame()) {
+               return x32_setup_rt_frame(usig, ka, info, cset, regs);
        } else {
                return __setup_rt_frame(sig, ka, info, set, regs);
        }
@@ -824,72 +856,6 @@ void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
 }
 
 #ifdef CONFIG_X86_X32_ABI
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-                             siginfo_t *info, compat_sigset_t *set,
-                             struct pt_regs *regs)
-{
-       struct rt_sigframe_x32 __user *frame;
-       void __user *restorer;
-       int err = 0;
-       void __user *fpstate = NULL;
-
-       frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
-
-       if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-               return -EFAULT;
-
-       if (ka->sa.sa_flags & SA_SIGINFO) {
-               if (copy_siginfo_to_user32(&frame->info, info))
-                       return -EFAULT;
-       }
-
-       put_user_try {
-               /* Create the ucontext.  */
-               if (cpu_has_xsave)
-                       put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
-               else
-                       put_user_ex(0, &frame->uc.uc_flags);
-               put_user_ex(0, &frame->uc.uc_link);
-               put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-               put_user_ex(sas_ss_flags(regs->sp),
-                           &frame->uc.uc_stack.ss_flags);
-               put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-               put_user_ex(0, &frame->uc.uc__pad0);
-               err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-                                       regs, set->sig[0]);
-               err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-               if (ka->sa.sa_flags & SA_RESTORER) {
-                       restorer = ka->sa.sa_restorer;
-               } else {
-                       /* could use a vstub here */
-                       restorer = NULL;
-                       err |= -EFAULT;
-               }
-               put_user_ex(restorer, &frame->pretcode);
-       } put_user_catch(err);
-
-       if (err)
-               return -EFAULT;
-
-       /* Set up registers for signal handler */
-       regs->sp = (unsigned long) frame;
-       regs->ip = (unsigned long) ka->sa.sa_handler;
-
-       /* We use the x32 calling convention here... */
-       regs->di = sig;
-       regs->si = (unsigned long) &frame->info;
-       regs->dx = (unsigned long) &frame->uc;
-
-       loadsegment(ds, __USER_DS);
-       loadsegment(es, __USER_DS);
-
-       regs->cs = __USER_CS;
-       regs->ss = __USER_DS;
-
-       return 0;
-}
-
 asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
 {
        struct rt_sigframe_x32 __user *frame;