uml: style fixes in FP code

Tidy the code affected by the floating point fixes.

A bunch of unused stuff is gone, including two sigcontext.c files,
which turned out to be entirely unneeded.

There are the usual fixes -
	whitespace and style cleanups
	copyright updates
	emacs formatting comments gone
	include cleanups
	adding severities to printks

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

10 files changed, 77 insertions, 238 deletions

diff --git a/arch/um/include/sysdep-i386/sigcontext.h b/arch/um/include/sysdep-i386/sigcontext.h
index 3050a6aaed7a..67e77122aa45 100644
--- a/arch/um/include/sysdep-i386/sigcontext.h
+++ b/arch/um/include/sysdep-i386/sigcontext.h
@@ -6,15 +6,10 @@
 #ifndef __SYS_SIGCONTEXT_I386_H
 #define __SYS_SIGCONTEXT_I386_H
 
-#include "uml-config.h"
-#include "skas.h"
 #include "sysdep/sc.h"
 
 #define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
 
-#define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
-#define SC_SET_SYSCALL_RETURN(sc, result) SC_EAX(sc) = (result)
-
 #define GET_FAULTINFO_FROM_SC(fi,sc) \
         { \
                 (fi).cr2 = SC_CR2(sc); \
@@ -22,18 +17,10 @@
                 (fi).trap_no = SC_TRAPNO(sc); \
         }
 
-/* ptrace expects that, at the start of a system call, %eax contains
- * -ENOSYS, so this makes it so.
- */
-#define SC_START_SYSCALL(sc) do SC_EAX(sc) = -ENOSYS; while(0)
-
 /* This is Page Fault */
 #define SEGV_IS_FIXABLE(fi)     ((fi)->trap_no == 14)
 
 /* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
 #define SEGV_MAYBE_FIXABLE(fi)  ((fi)->trap_no == 0 && ptrace_faultinfo)
 
-extern unsigned long *sc_sigmask(void *sc_ptr);
-extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
-
 #endif
diff --git a/arch/um/include/sysdep-x86_64/sigcontext.h b/arch/um/include/sysdep-x86_64/sigcontext.h
index 41073235e7ad..0155133b1458 100644
--- a/arch/um/include/sysdep-x86_64/sigcontext.h
+++ b/arch/um/include/sysdep-x86_64/sigcontext.h
@@ -11,43 +11,17 @@
 
 #define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
 
-#define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
-#define SC_SET_SYSCALL_RETURN(sc, result) SC_RAX(sc) = (result)
-
-#define SC_FAULT_ADDR(sc) SC_CR2(sc)
-#define SC_FAULT_TYPE(sc) SC_ERR(sc)
-
-#define GET_FAULTINFO_FROM_SC(fi,sc) \
+#define GET_FAULTINFO_FROM_SC(fi, sc) \
         { \
                 (fi).cr2 = SC_CR2(sc); \
                 (fi).error_code = SC_ERR(sc); \
                 (fi).trap_no = SC_TRAPNO(sc); \
         }
 
-/* ptrace expects that, at the start of a system call, %eax contains
- * -ENOSYS, so this makes it so.
- */
-
-#define SC_START_SYSCALL(sc) do SC_RAX(sc) = -ENOSYS; while(0)
-
 /* This is Page Fault */
 #define SEGV_IS_FIXABLE(fi)     ((fi)->trap_no == 14)
 
 /* No broken SKAS API, which doesn't pass trap_no, here. */
 #define SEGV_MAYBE_FIXABLE(fi)  0
 
-extern unsigned long *sc_sigmask(void *sc_ptr);
-
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
-
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 2511f9199417..a0eba0833068 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -171,8 +171,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                  */
                 ret = copy_to_user(p, &child->thread.arch.faultinfo,
                                    sizeof(struct ptrace_faultinfo));
-                if (ret)
-                        break;
                 break;
         }
 
diff --git a/arch/um/os-Linux/sys-i386/registers.c b/arch/um/os-Linux/sys-i386/registers.c
index 8f1f0ab639b9..d1997ca76e5c 100644
--- a/arch/um/os-Linux/sys-i386/registers.c
+++ b/arch/um/os-Linux/sys-i386/registers.c
@@ -1,49 +1,55 @@
 /*
  * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
 #include <errno.h>
-#include <sysdep/ptrace_user.h>
+#include "kern_constants.h"
 #include "longjmp.h"
 #include "user.h"
+#include "sysdep/ptrace_user.h"
 
 int save_fp_registers(int pid, unsigned long *fp_regs)
 {
-        if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
+        if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
                 return -errno;
         return 0;
 }
 
 int restore_fp_registers(int pid, unsigned long *fp_regs)
 {
-        if(ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
+        if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
                 return -errno;
         return 0;
 }
 
 int save_fpx_registers(int pid, unsigned long *fp_regs)
 {
-        if(ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
+        if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
                 return -errno;
         return 0;
 }
 
 int restore_fpx_registers(int pid, unsigned long *fp_regs)
 {
-        if(ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
+        if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
                 return -errno;
         return 0;
 }
 
 unsigned long get_thread_reg(int reg, jmp_buf *buf)
 {
-        switch(reg){
-        case EIP: return buf[0]->__eip;
-        case UESP: return buf[0]->__esp;
-        case EBP: return buf[0]->__ebp;
+        switch (reg) {
+        case EIP:
+                return buf[0]->__eip;
+        case UESP:
+                return buf[0]->__esp;
+        case EBP:
+                return buf[0]->__ebp;
         default:
-                printk("get_thread_regs - unknown register %d\n", reg);
+                printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
+                       reg);
                 return 0;
         }
 }
diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile
index 9468cf364843..964dc1a04c37 100644
--- a/arch/um/sys-i386/Makefile
+++ b/arch/um/sys-i386/Makefile
@@ -3,14 +3,14 @@
 #
 
 obj-y = bug.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
-        ptrace_user.o setjmp.o signal.o sigcontext.o stub.o stub_segv.o \
-        syscalls.o sysrq.o sys_call_table.o tls.o
+        ptrace_user.o setjmp.o signal.o stub.o stub_segv.o syscalls.o sysrq.o \
+        sys_call_table.o tls.o
 
 subarch-obj-y = lib/bitops_32.o lib/semaphore_32.o lib/string_32.o
 subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem_32.o
 subarch-obj-$(CONFIG_MODULES) += kernel/module_32.o
 
-USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o
+USER_OBJS := bugs.o ptrace_user.o fault.o
 
 USER_OBJS += user-offsets.s
 extra-y += user-offsets.s
diff --git a/arch/um/sys-i386/sigcontext.c b/arch/um/sys-i386/sigcontext.c
deleted file mode 100644
index 467d489c31cd..000000000000
--- a/arch/um/sys-i386/sigcontext.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* 
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stddef.h>
-#include <string.h>
-#include <asm/ptrace.h>
-#include <asm/sigcontext.h>
-#include "sysdep/ptrace.h"
-#include "kern_util.h"
-
-void sc_to_sc(void *to_ptr, void *from_ptr)
-{
-        struct sigcontext *to = to_ptr, *from = from_ptr;
-
-        memcpy(to, from, sizeof(*to) + sizeof(struct _fpstate));
-        if(from->fpstate != NULL)
-                to->fpstate = (struct _fpstate *) (to + 1);
-}
-
-unsigned long *sc_sigmask(void *sc_ptr)
-{
-        struct sigcontext *sc = sc_ptr;
-        return &sc->oldmask;
-}
-
-int sc_get_fpregs(unsigned long buf, void *sc_ptr)
-{
-        struct sigcontext *sc = sc_ptr;
-        struct _fpstate *from = sc->fpstate, *to = (struct _fpstate *) buf;
-        int err = 0;
-
-        if(from == NULL){
-                err |= clear_user_proc(&to->cw, sizeof(to->cw));
-                err |= clear_user_proc(&to->sw, sizeof(to->sw));
-                err |= clear_user_proc(&to->tag, sizeof(to->tag));
-                err |= clear_user_proc(&to->ipoff, sizeof(to->ipoff));
-                err |= clear_user_proc(&to->cssel, sizeof(to->cssel));
-                err |= clear_user_proc(&to->dataoff, sizeof(to->dataoff));
-                err |= clear_user_proc(&to->datasel, sizeof(to->datasel));
-                err |= clear_user_proc(&to->_st, sizeof(to->_st));
-        }
-        else {
-                err |= copy_to_user_proc(&to->cw, &from->cw, sizeof(to->cw));
-                err |= copy_to_user_proc(&to->sw, &from->sw, sizeof(to->sw));
-                err |= copy_to_user_proc(&to->tag, &from->tag, 
-                                         sizeof(to->tag));
-                err |= copy_to_user_proc(&to->ipoff, &from->ipoff, 
-                                         sizeof(to->ipoff));
-                err |= copy_to_user_proc(&to->cssel,& from->cssel, 
-                                         sizeof(to->cssel));
-                err |= copy_to_user_proc(&to->dataoff, &from->dataoff, 
-                                    sizeof(to->dataoff));
-                err |= copy_to_user_proc(&to->datasel, &from->datasel, 
-                                    sizeof(to->datasel));
-                err |= copy_to_user_proc(to->_st, from->_st, sizeof(to->_st));
-        }
-        return(err);
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
index 002bb020f96a..3c22de532088 100644
--- a/arch/um/sys-x86_64/Makefile
+++ b/arch/um/sys-x86_64/Makefile
@@ -5,8 +5,8 @@
 #
 
 obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
-        setjmp.o sigcontext.o signal.o stub.o stub_segv.o syscalls.o \
-        syscall_table.o sysrq.o ksyms.o tls.o
+        setjmp.o signal.o stub.o stub_segv.o syscalls.o syscall_table.o \
+        sysrq.o ksyms.o tls.o
 
 obj-$(CONFIG_MODULES) += um_module.o
 
@@ -15,7 +15,7 @@ subarch-obj-$(CONFIG_MODULES) += kernel/module_64.o
 
 ldt-y = ../sys-i386/ldt.o
 
-USER_OBJS := ptrace_user.o sigcontext.o
+USER_OBJS := ptrace_user.o
 
 USER_OBJS += user-offsets.s
 extra-y += user-offsets.s
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index b9032992a997..a3cfeed17af4 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -1,5 +1,6 @@
 /*
  * Copyright 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  *
  * Licensed under the GPL
  */
@@ -12,17 +13,10 @@
 #include <asm/uaccess.h>
 #include <asm/elf.h>
 
-/* XXX x86_64 */
-unsigned long not_ss;
-unsigned long not_ds;
-unsigned long not_es;
-
-#define SC_SS(r) (not_ss)
-#define SC_DS(r) (not_ds)
-#define SC_ES(r) (not_es)
-
-/* determines which flags the user has access to. */
-/* 1 = access 0 = no access */
+/*
+ * determines which flags the user has access to.
+ * 1 = access 0 = no access
+ */
 #define FLAG_MASK 0x44dd5UL
 
 int putreg(struct task_struct *child, int regno, unsigned long value)
@@ -66,20 +60,21 @@ int putreg(struct task_struct *child, int regno, unsigned long value)
 
 int poke_user(struct task_struct *child, long addr, long data)
 {
-        if ((addr & 3) || addr < 0)
-                return -EIO;
-
-        if (addr < MAX_REG_OFFSET)
-                return putreg(child, addr, data);
-        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-                (addr <= offsetof(struct user, u_debugreg[7]))){
-                addr -= offsetof(struct user, u_debugreg[0]);
-                addr = addr >> 2;
-                if((addr == 4) || (addr == 5)) return -EIO;
-                child->thread.arch.debugregs[addr] = data;
-                return 0;
-        }
-        return -EIO;
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        if (addr < MAX_REG_OFFSET)
+                return putreg(child, addr, data);
+        else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                if ((addr == 4) || (addr == 5))
+                        return -EIO;
+                child->thread.arch.debugregs[addr] = data;
+                return 0;
+        }
+        return -EIO;
 }
 
 unsigned long getreg(struct task_struct *child, int regno)
@@ -107,29 +102,22 @@ unsigned long getreg(struct task_struct *child, int regno)
 int peek_user(struct task_struct *child, long addr, long data)
 {
         /* read the word at location addr in the USER area. */
-        unsigned long tmp;
-
-        if ((addr & 3) || addr < 0)
-                return -EIO;
-
-        tmp = 0;  /* Default return condition */
-        if(addr < MAX_REG_OFFSET){
-                tmp = getreg(child, addr);
-        }
-        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-                (addr <= offsetof(struct user, u_debugreg[7]))){
-                addr -= offsetof(struct user, u_debugreg[0]);
-                addr = addr >> 2;
-                tmp = child->thread.arch.debugregs[addr];
-        }
-        return put_user(tmp, (unsigned long *) data);
-}
+        unsigned long tmp;
 
-void arch_switch(void)
-{
-/* XXX
-        printk("arch_switch\n");
-*/
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        tmp = 0;  /* Default return condition */
+        if (addr < MAX_REG_OFFSET){
+                tmp = getreg(child, addr);
+        }
+        else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                tmp = child->thread.arch.debugregs[addr];
+        }
+        return put_user(tmp, (unsigned long *) data);
 }
 
 /* XXX Mostly copied from sys-i386 */
@@ -139,21 +127,21 @@ int is_syscall(unsigned long addr)
         int n;
 
         n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
-        if(n){
+        if (n){
                 /* access_process_vm() grants access to vsyscall and stub,
                  * while copy_from_user doesn't. Maybe access_process_vm is
                  * slow, but that doesn't matter, since it will be called only
                  * in case of singlestepping, if copy_from_user failed.
                  */
                 n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
-                if(n != sizeof(instr)) {
+                if (n != sizeof(instr)) {
                         printk("is_syscall : failed to read instruction from "
                                "0x%lx\n", addr);
-                        return(1);
+                        return 1;
                 }
         }
         /* sysenter */
-        return(instr == 0x050f);
+        return instr == 0x050f;
 }
 
 int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
@@ -204,14 +192,3 @@ long subarch_ptrace(struct task_struct *child, long request, long addr,
 
         return ret;
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/sys-x86_64/sigcontext.c b/arch/um/sys-x86_64/sigcontext.c
deleted file mode 100644
index c88e64def6f2..000000000000
--- a/arch/um/sys-x86_64/sigcontext.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright 2003 PathScale, Inc.
- *
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <signal.h>
-#include "user.h"
-
-void sc_to_sc(void *to_ptr, void *from_ptr)
-{
-        struct sigcontext *to = to_ptr, *from = from_ptr;
-        int size = sizeof(*to); /* + sizeof(struct _fpstate); */
-
-        memcpy(to, from, size);
-        if(from->fpstate != NULL)
-                to->fpstate = (struct _fpstate *) (to + 1);
-
-        to->fpstate = NULL;
-}
-
-unsigned long *sc_sigmask(void *sc_ptr)
-{
-        struct sigcontext *sc = sc_ptr;
-
-        return(&sc->oldmask);
-}
-
-/* Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
index a8e5fd7b2adb..1778d33808f4 100644
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
@@ -110,7 +111,8 @@ static int copy_sc_to_user(struct sigcontext __user *to,
         err |= PUTREG(regs, RDI, to, rdi);
         err |= PUTREG(regs, RSI, to, rsi);
         err |= PUTREG(regs, RBP, to, rbp);
-        /* Must use orignal RSP, which is passed in, rather than what's in
+        /*
+         * Must use orignal RSP, which is passed in, rather than what's in
          * the pt_regs, because that's already been updated to point at the
          * signal frame.
          */
@@ -152,7 +154,7 @@ static int copy_sc_to_user(struct sigcontext __user *to,
         if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
                 return 1;
 
-        return(err);
+        return err;
 }
 
 struct rt_sigframe
@@ -188,7 +190,8 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
                         goto out;
         }
 
-        /* Update SP now because the page fault handler refuses to extend
+        /*
+         * Update SP now because the page fault handler refuses to extend
          * the stack if the faulting address is too far below the current
          * SP, which frame now certainly is.  If there's an error, the original
          * value is restored on the way out.
@@ -216,8 +219,10 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
                 err |= __copy_to_user(&frame->uc.uc_sigmask, set,
                                       sizeof(*set));
 
-        /* Set up to return from userspace.  If provided, use a stub
-           already in userspace.  */
+        /*
+         * Set up to return from userspace.  If provided, use a stub
+         * already in userspace.
+         */
         /* x86-64 should always use SA_RESTORER. */
         if (ka->sa.sa_flags & SA_RESTORER)
                 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
@@ -239,8 +244,10 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
         /* In case the signal handler was declared without prototypes */
         PT_REGS_RAX(regs) = 0;
 
-        /* This also works for non SA_SIGINFO handlers because they expect the
-           next argument after the signal number on the stack. */
+        /*
+         * This also works for non SA_SIGINFO handlers because they expect the
+         * next argument after the signal number on the stack.
+         */
         PT_REGS_RSI(regs) = (unsigned long) &frame->info;
         PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
         PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
@@ -276,7 +283,7 @@ long sys_rt_sigreturn(struct pt_regs *regs)
 
         /* Avoid ERESTART handling */
         PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
-        return(PT_REGS_SYSCALL_RET(&current->thread.regs));
+        return PT_REGS_SYSCALL_RET(&current->thread.regs);
 
  segfault:
         force_sig(SIGSEGV, current);