sh: gcc4 support.

This fixes up the kernel for gcc4. The existing exception handlers
needed some wrapping for pt_regs access, acessing the registers
via a RELOC_HIDE() pointer.

The strcpy() issues popped up here too, so add -ffreestanding and
kill off the symbol export.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

8 files changed, 78 insertions, 64 deletions

diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 6b3af5ce66a2..7f4516c3f83d 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -43,7 +43,7 @@ cflags-$(CONFIG_CPU_SH4A)		:= -m4a $(call cc-option,-m4a-nofpu,)
 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mb
 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -ml
 
-cflags-y        += $(call as-option,-Wa$(comma)-isa=$(isa-y),)
+cflags-y        += $(call as-option,-Wa$(comma)-isa=$(isa-y),) -ffreestanding
 
 cflags-$(CONFIG_SH_DSP)                 += -Wa,-dsp
 cflags-$(CONFIG_SH_KGDB)                += -g
diff --git a/arch/sh/kernel/cpu/sh4/fpu.c b/arch/sh/kernel/cpu/sh4/fpu.c
index f486c07e10e2..378b488237c9 100644
--- a/arch/sh/kernel/cpu/sh4/fpu.c
+++ b/arch/sh/kernel/cpu/sh4/fpu.c
@@ -296,16 +296,17 @@ ieee_fpe_handler (struct pt_regs *regs)
 }
 
 asmlinkage void
-do_fpu_error(unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7,
-             struct pt_regs regs)
+do_fpu_error(unsigned long r4, unsigned long r5, unsigned long r6,
+             unsigned long r7, struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         struct task_struct *tsk = current;
 
-        if (ieee_fpe_handler (&regs))
+        if (ieee_fpe_handler(regs))
                 return;
 
-        regs.pc += 2;
-        save_fpu(tsk, &regs);
+        regs->pc += 2;
+        save_fpu(tsk, regs);
         tsk->thread.trap_no = 11;
         tsk->thread.error_code = 0;
         force_sig(SIGFPE, tsk);
@@ -313,12 +314,13 @@ do_fpu_error(unsigned long r4, unsigned long r5, unsigned long r6, unsigned long
 
 asmlinkage void
 do_fpu_state_restore(unsigned long r4, unsigned long r5, unsigned long r6,
-                     unsigned long r7, struct pt_regs regs)
+                     unsigned long r7, struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         struct task_struct *tsk = current;
 
-        grab_fpu(&regs);
-        if (!user_mode(&regs)) {
+        grab_fpu(regs);
+        if (!user_mode(regs)) {
                 printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
                 return;
         }
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 944128ce9706..edf4d2d21336 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -84,9 +84,10 @@ static union irq_ctx *softirq_ctx[NR_CPUS];
 
 asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
                       unsigned long r6, unsigned long r7,
-                      struct pt_regs regs)
+                      struct pt_regs __regs)
 {
-        struct pt_regs *old_regs = set_irq_regs(&regs);
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+        struct pt_regs *old_regs = set_irq_regs(regs);
         int irq;
 #ifdef CONFIG_4KSTACKS
         union irq_ctx *curctx, *irqctx;
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index a52b13ac6b7f..f3e2631be144 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -385,10 +385,11 @@ struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *ne
 
 asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
                         unsigned long r6, unsigned long r7,
-                        struct pt_regs regs)
+                        struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
 #ifdef CONFIG_MMU
-        return do_fork(SIGCHLD, regs.regs[15], &regs, 0, NULL, NULL);
+        return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
 #else
         /* fork almost works, enough to trick you into looking elsewhere :-( */
         return -EINVAL;
@@ -398,11 +399,12 @@ asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
                          unsigned long parent_tidptr,
                          unsigned long child_tidptr,
-                         struct pt_regs regs)
+                         struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         if (!newsp)
-                newsp = regs.regs[15];
-        return do_fork(clone_flags, newsp, &regs, 0,
+                newsp = regs->regs[15];
+        return do_fork(clone_flags, newsp, regs, 0,
                         (int __user *)parent_tidptr, (int __user *)child_tidptr);
 }
 
@@ -418,9 +420,10 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
  */
 asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
                          unsigned long r6, unsigned long r7,
-                         struct pt_regs regs)
+                         struct pt_regs __regs)
 {
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.regs[15], &regs,
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
                        0, NULL, NULL);
 }
 
@@ -429,8 +432,9 @@ asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
  */
 asmlinkage int sys_execve(char *ufilename, char **uargv,
                           char **uenvp, unsigned long r7,
-                          struct pt_regs regs)
+                          struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         int error;
         char *filename;
 
@@ -442,7 +446,7 @@ asmlinkage int sys_execve(char *ufilename, char **uargv,
         error = do_execve(filename,
                           (char __user * __user *)uargv,
                           (char __user * __user *)uenvp,
-                          &regs);
+                          regs);
         if (error == 0) {
                 task_lock(current);
                 current->ptrace &= ~PT_DTRACE;
@@ -472,9 +476,7 @@ unsigned long get_wchan(struct task_struct *p)
         return pc;
 }
 
-asmlinkage void break_point_trap(unsigned long r4, unsigned long r5,
-                                 unsigned long r6, unsigned long r7,
-                                 struct pt_regs regs)
+asmlinkage void break_point_trap(void)
 {
         /* Clear tracing.  */
 #if defined(CONFIG_CPU_SH4A)
@@ -492,8 +494,10 @@ asmlinkage void break_point_trap(unsigned long r4, unsigned long r5,
 
 asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5,
                                           unsigned long r6, unsigned long r7,
-                                          struct pt_regs regs)
+                                          struct pt_regs __regs)
 {
-        regs.pc -= 2;
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+
+        regs->pc -= 2;
         force_sig(SIGTRAP, current);
 }
diff --git a/arch/sh/kernel/sh_ksyms.c b/arch/sh/kernel/sh_ksyms.c
index 8a2fd19dc9eb..c706f3bfd897 100644
--- a/arch/sh/kernel/sh_ksyms.c
+++ b/arch/sh/kernel/sh_ksyms.c
@@ -73,8 +73,6 @@ DECLARE_EXPORT(__lshrdi3);
 DECLARE_EXPORT(__movstr);
 DECLARE_EXPORT(__movstrSI16);
 
-EXPORT_SYMBOL(strcpy);
-
 #ifdef CONFIG_CPU_SH4
 DECLARE_EXPORT(__movstr_i4_even);
 DECLARE_EXPORT(__movstr_i4_odd);
diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c
index 764886b4bcf1..50d7c4993bef 100644
--- a/arch/sh/kernel/signal.c
+++ b/arch/sh/kernel/signal.c
@@ -37,7 +37,7 @@
 asmlinkage int
 sys_sigsuspend(old_sigset_t mask,
                unsigned long r5, unsigned long r6, unsigned long r7,
-               struct pt_regs regs)
+               struct pt_regs __regs)
 {
         mask &= _BLOCKABLE;
         spin_lock_irq(&current->sighand->siglock);
@@ -52,7 +52,7 @@ sys_sigsuspend(old_sigset_t mask,
         return -ERESTARTNOHAND;
 }
 
-asmlinkage int 
+asmlinkage int
 sys_sigaction(int sig, const struct old_sigaction __user *act,
               struct old_sigaction __user *oact)
 {
@@ -87,9 +87,11 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
 asmlinkage int
 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
                 unsigned long r6, unsigned long r7,
-                struct pt_regs regs)
+                struct pt_regs __regs)
 {
-        return do_sigaltstack(uss, uoss, regs.regs[15]);
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+
+        return do_sigaltstack(uss, uoss, regs->regs[15]);
 }
 
 
@@ -198,9 +200,10 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p
 
 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
                              unsigned long r6, unsigned long r7,
-                             struct pt_regs regs)
+                             struct pt_regs __regs)
 {
-        struct sigframe __user *frame = (struct sigframe __user *)regs.regs[15];
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
+        struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
         sigset_t set;
         int r0;
 
@@ -220,7 +223,7 @@ asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
 
-        if (restore_sigcontext(&regs, &frame->sc, &r0))
+        if (restore_sigcontext(regs, &frame->sc, &r0))
                 goto badframe;
         return r0;
 
@@ -231,9 +234,10 @@ badframe:
 
 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
                                 unsigned long r6, unsigned long r7,
-                                struct pt_regs regs)
+                                struct pt_regs __regs)
 {
-        struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.regs[15];
+        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;
@@ -250,14 +254,14 @@ asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
 
-        if (restore_sigcontext(&regs, &frame->uc.uc_mcontext, &r0))
+        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
                 goto badframe;
 
         if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
                 goto badframe;
         /* It is more difficult to avoid calling this function than to
            call it and ignore errors.  */
-        do_sigaltstack(&st, NULL, regs.regs[15]);
+        do_sigaltstack(&st, NULL, regs->regs[15]);
 
         return r0;
 
diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c
index 07f2b5718938..5083b6ed4b39 100644
--- a/arch/sh/kernel/sys_sh.c
+++ b/arch/sh/kernel/sys_sh.c
@@ -33,14 +33,15 @@
  */
 asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
         unsigned long r6, unsigned long r7,
-        struct pt_regs regs)
+        struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         int fd[2];
         int error;
 
         error = do_pipe(fd);
         if (!error) {
-                regs.regs[1] = fd[1];
+                regs->regs[1] = fd[1];
                 return fd[0];
         }
         return error;
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index f558748d7543..b52037bc1255 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -23,8 +23,8 @@
 
 #ifdef CONFIG_SH_KGDB
 #include <asm/kgdb.h>
-#define CHK_REMOTE_DEBUG(regs)                  \
-{                                               \
+#define CHK_REMOTE_DEBUG(regs)                  \
+{                                               \
         if (kgdb_debug_hook && !user_mode(regs))\
                 (*kgdb_debug_hook)(regs);       \
 }
@@ -501,7 +501,7 @@ static int handle_unaligned_access(u16 instruction, struct pt_regs *regs)
 /*
  * Handle various address error exceptions
  */
-asmlinkage void do_address_error(struct pt_regs *regs, 
+asmlinkage void do_address_error(struct pt_regs *regs,
                                  unsigned long writeaccess,
                                  unsigned long address)
 {
@@ -588,7 +588,7 @@ int is_dsp_inst(struct pt_regs *regs)
 {
         unsigned short inst;
 
-        /* 
+        /*
          * Safe guard if DSP mode is already enabled or we're lacking
          * the DSP altogether.
          */
@@ -612,8 +612,9 @@ int is_dsp_inst(struct pt_regs *regs)
 #ifdef CONFIG_CPU_SH2A
 asmlinkage void do_divide_error(unsigned long r4, unsigned long r5,
                                 unsigned long r6, unsigned long r7,
-                                struct pt_regs regs)
+                                struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         siginfo_t info;
 
         current->thread.trap_no = r4;
@@ -635,12 +636,13 @@ asmlinkage void do_divide_error(unsigned long r4, unsigned long r5,
 /* arch/sh/kernel/cpu/sh4/fpu.c */
 extern int do_fpu_inst(unsigned short, struct pt_regs *);
 extern asmlinkage void do_fpu_state_restore(unsigned long r4, unsigned long r5,
-                unsigned long r6, unsigned long r7, struct pt_regs regs);
+                unsigned long r6, unsigned long r7, struct pt_regs __regs);
 
 asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
                                 unsigned long r6, unsigned long r7,
-                                struct pt_regs regs)
+                                struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         unsigned long error_code;
         struct task_struct *tsk = current;
 
@@ -648,11 +650,11 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
         unsigned short inst = 0;
         int err;
 
-        get_user(inst, (unsigned short*)regs.pc);
+        get_user(inst, (unsigned short*)regs->pc);
 
-        err = do_fpu_inst(inst, &regs);
+        err = do_fpu_inst(inst, regs);
         if (!err) {
-                regs.pc += 2;
+                regs->pc += 2;
                 return;
         }
         /* not a FPU inst. */
@@ -660,9 +662,9 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
 
 #ifdef CONFIG_SH_DSP
         /* Check if it's a DSP instruction */
-        if (is_dsp_inst(&regs)) {
+        if (is_dsp_inst(regs)) {
                 /* Enable DSP mode, and restart instruction. */
-                regs.sr |= SR_DSP;
+                regs->sr |= SR_DSP;
                 return;
         }
 #endif
@@ -672,9 +674,9 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
         local_irq_enable();
         tsk->thread.error_code = error_code;
         tsk->thread.trap_no = TRAP_RESERVED_INST;
-        CHK_REMOTE_DEBUG(&regs);
+        CHK_REMOTE_DEBUG(regs);
         force_sig(SIGILL, tsk);
-        die_if_no_fixup("reserved instruction", &regs, error_code);
+        die_if_no_fixup("reserved instruction", regs, error_code);
 }
 
 #ifdef CONFIG_SH_FPU_EMU
@@ -722,17 +724,18 @@ static int emulate_branch(unsigned short inst, struct pt_regs* regs)
 
 asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5,
                                 unsigned long r6, unsigned long r7,
-                                struct pt_regs regs)
+                                struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         unsigned long error_code;
         struct task_struct *tsk = current;
 #ifdef CONFIG_SH_FPU_EMU
         unsigned short inst = 0;
 
-        get_user(inst, (unsigned short *)regs.pc + 1);
-        if (!do_fpu_inst(inst, &regs)) {
-                get_user(inst, (unsigned short *)regs.pc);
-                if (!emulate_branch(inst, &regs))
+        get_user(inst, (unsigned short *)regs->pc + 1);
+        if (!do_fpu_inst(inst, regs)) {
+                get_user(inst, (unsigned short *)regs->pc);
+                if (!emulate_branch(inst, regs))
                         return;
                 /* fault in branch.*/
         }
@@ -744,19 +747,20 @@ asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5,
         local_irq_enable();
         tsk->thread.error_code = error_code;
         tsk->thread.trap_no = TRAP_RESERVED_INST;
-        CHK_REMOTE_DEBUG(&regs);
+        CHK_REMOTE_DEBUG(regs);
         force_sig(SIGILL, tsk);
-        die_if_no_fixup("illegal slot instruction", &regs, error_code);
+        die_if_no_fixup("illegal slot instruction", regs, error_code);
 }
 
 asmlinkage void do_exception_error(unsigned long r4, unsigned long r5,
                                    unsigned long r6, unsigned long r7,
-                                   struct pt_regs regs)
+                                   struct pt_regs __regs)
 {
+        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
         long ex;
 
         lookup_exception_vector(ex);
-        die_if_kernel("exception", &regs, ex);
+        die_if_kernel("exception", regs, ex);
 }
 
 #if defined(CONFIG_SH_STANDARD_BIOS)
@@ -809,7 +813,7 @@ void *set_exception_table_vec(unsigned int vec, void *handler)
 
 extern asmlinkage void address_error_handler(unsigned long r4, unsigned long r5,
                                              unsigned long r6, unsigned long r7,
-                                             struct pt_regs regs);
+                                             struct pt_regs __regs);
 
 void __init trap_init(void)
 {