[PATCH] uml: move libc-dependent skas memory mapping code

The serial UML OS-abstraction layer patch (um/kernel/skas dir).

This moves all systemcalls from skas/mem_user.c file under os-Linux dir and
join skas/mem_user.c and skas/mem.c files.

Signed-off-by: Gennady Sharapov <gennady.v.sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 123 insertions, 118 deletions

diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 624938ad9e14..8006e085b675 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -11,6 +11,7 @@
 #include "../os/include/file.h"
 #include "sysdep/ptrace.h"
 #include "kern_util.h"
+#include "skas/mm_id.h"
 
 #define OS_TYPE_FILE 1 
 #define OS_TYPE_DIR 2 
@@ -255,4 +256,20 @@ extern void user_time_init(void);
 extern void uml_idle_timer(void);
 extern unsigned long long os_nsecs(void);
 
+/* skas/mem.c */
+extern long run_syscall_stub(struct mm_id * mm_idp,
+                             int syscall, unsigned long *args, long expected,
+                             void **addr, int done);
+extern long syscall_stub_data(struct mm_id * mm_idp,
+                              unsigned long *data, int data_count,
+                              void **addr, void **stub_addr);
+extern int map(struct mm_id * mm_idp, unsigned long virt,
+               unsigned long len, int r, int w, int x, int phys_fd,
+               unsigned long long offset, int done, void **data);
+extern int unmap(struct mm_id * mm_idp, void *addr, unsigned long len,
+                 int done, void **data);
+extern int protect(struct mm_id * mm_idp, unsigned long addr,
+                   unsigned long len, int r, int w, int x, int done,
+                   void **data);
+
 #endif
diff --git a/arch/um/include/skas/skas.h b/arch/um/include/skas/skas.h
index 158f322248e3..7418f2addda2 100644
--- a/arch/um/include/skas/skas.h
+++ b/arch/um/include/skas/skas.h
@@ -24,14 +24,6 @@ extern void userspace(union uml_pt_regs *regs);
 extern void new_thread_proc(void *stack, void (*handler)(int sig));
 extern void new_thread_handler(int sig);
 extern void handle_syscall(union uml_pt_regs *regs);
-extern int map(struct mm_id * mm_idp, unsigned long virt,
-               unsigned long len, int r, int w, int x, int phys_fd,
-               unsigned long long offset, int done, void **data);
-extern int unmap(struct mm_id * mm_idp, void *addr, unsigned long len,
-                 int done, void **data);
-extern int protect(struct mm_id * mm_idp, unsigned long addr,
-                   unsigned long len, int r, int w, int x, int done,
-                   void **data);
 extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
 extern int new_mm(unsigned long stack);
 extern int start_userspace(unsigned long stub_stack);
@@ -39,11 +31,5 @@ extern int copy_context_skas0(unsigned long stack, int pid);
 extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
 extern long execute_syscall_skas(void *r);
 extern unsigned long current_stub_stack(void);
-extern long run_syscall_stub(struct mm_id * mm_idp,
-                             int syscall, unsigned long *args, long expected,
-                             void **addr, int done);
-extern long syscall_stub_data(struct mm_id * mm_idp,
-                              unsigned long *data, int data_count,
-                              void **addr, void **stub_addr);
 
 #endif
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index 7a9fc16d71d4..eb664c67c3f4 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -1,9 +1,9 @@
-# 
+#
 # Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com)
 # Licensed under the GPL
 #
 
-obj-y := clone.o exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \
+obj-y := clone.o exec_kern.o mem.o mmu.o process.o process_kern.o \
         syscall.o tlb.o uaccess.o
 
 USER_OBJS := process.o clone.o
diff --git a/arch/um/os-Linux/skas/Makefile b/arch/um/os-Linux/skas/Makefile
index eab5386d60a7..79cc6c72aa92 100644
--- a/arch/um/os-Linux/skas/Makefile
+++ b/arch/um/os-Linux/skas/Makefile
@@ -3,8 +3,8 @@
 # Licensed under the GPL
 #
 
-obj-y := trap.o
+obj-y := mem.o trap.o
 
-USER_OBJS := trap.o
+USER_OBJS := mem.o trap.o
 
 include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/mem_user.c b/arch/um/os-Linux/skas/mem.c
index 1d89640bd502..9890e9090f58 100644
--- a/arch/um/kernel/skas/mem_user.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -32,7 +32,7 @@ extern void wait_stub_done(int pid, int sig, char * fname);
 static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
                                               unsigned long *stack)
 {
-        if(stack == NULL){
+        if(stack == NULL) {
                 stack = (unsigned long *) mm_idp->stack + 2;
                 *stack = 0;
         }
@@ -45,13 +45,14 @@ int single_count = 0;
 int multi_count = 0;
 int multi_op_count = 0;
 
-static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
+static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 {
         unsigned long regs[MAX_REG_NR];
-        unsigned long *data;
-        unsigned long *syscall;
+        int n;
         long ret, offset;
-        int n, pid = mm_idp->u.pid;
+        unsigned long * data;
+        unsigned long * syscall;
+        int pid = mm_idp->u.pid;
 
         if(proc_mm)
 #warning Need to look up userspace_pid by cpu
@@ -59,10 +60,11 @@ static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
 
         multi_count++;
 
-        get_safe_registers(regs);
-        regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
+        get_safe_registers(regs);
+        regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
                 ((unsigned long) &batch_syscall_stub -
-                 (unsigned long) &__syscall_stub_start);
+                 (unsigned long) &__syscall_stub_start);
+
         n = ptrace_setregs(pid, regs);
         if(n < 0)
                 panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
@@ -80,6 +82,8 @@ static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
         if (offset) {
                 data = (unsigned long *)(mm_idp->stack +
                                          offset - UML_CONFIG_STUB_DATA);
+                printk("do_syscall_stub : ret = %d, offset = %d, "
+                       "data = 0x%x\n", ret, offset, data);
                 syscall = (unsigned long *)((unsigned long)data + data[0]);
                 printk("do_syscall_stub: syscall %ld failed, return value = "
                        "0x%lx, expected return value = 0x%lx\n",
@@ -107,32 +111,32 @@ static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
 
 long run_syscall_stub(struct mm_id * mm_idp, int syscall,
                       unsigned long *args, long expected, void **addr,
-                      int done)
+                      int done)
 {
-        unsigned long *stack = check_init_stack(mm_idp, *addr);
+        unsigned long *stack = check_init_stack(mm_idp, *addr);
 
         if(done && *addr == NULL)
                 single_count++;
 
-        *stack += sizeof(long);
+        *stack += sizeof(long);
         stack += *stack / sizeof(long);
 
-        *stack++ = syscall;
-        *stack++ = args[0];
-        *stack++ = args[1];
-        *stack++ = args[2];
-        *stack++ = args[3];
-        *stack++ = args[4];
-        *stack++ = args[5];
+        *stack++ = syscall;
+        *stack++ = args[0];
+        *stack++ = args[1];
+        *stack++ = args[2];
+        *stack++ = args[3];
+        *stack++ = args[4];
+        *stack++ = args[5];
         *stack++ = expected;
-        *stack = 0;
-        multi_op_count++;
+        *stack = 0;
+        multi_op_count++;
 
-        if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
+        if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
                      PAGE_SIZE - 10 * sizeof(long))){
                 *addr = stack;
-                return 0;
-        }
+                return 0;
+        }
 
         return do_syscall_stub(mm_idp, addr);
 }
@@ -150,7 +154,7 @@ long syscall_stub_data(struct mm_id * mm_idp,
         if((((unsigned long) *addr) & ~PAGE_MASK) >=
            PAGE_SIZE - (10 + data_count) * sizeof(long)) {
                 ret = do_syscall_stub(mm_idp, addr);
-                /* in case of error, don't overwrite data on stack */
+                /* in case of error, don't overwrite data on stack */
                 if(ret)
                         return ret;
         }
@@ -172,39 +176,39 @@ int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
         int r, int w, int x, int phys_fd, unsigned long long offset,
         int done, void **data)
 {
-        int prot, ret;
-
-        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
-                (x ? PROT_EXEC : 0);
-
-        if(proc_mm){
-                struct proc_mm_op map;
-                int fd = mm_idp->u.mm_fd;
-
-                map = ((struct proc_mm_op) { .op        = MM_MMAP,
-                                             .u         =
-                                             { .mmap    =
-                                               { .addr  = virt,
-                                                 .len   = len,
-                                                 .prot  = prot,
-                                                 .flags = MAP_SHARED |
-                                                 MAP_FIXED,
-                                                 .fd    = phys_fd,
-                                                 .offset= offset
-                                               } } } );
+        int prot, ret;
+
+        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+                (x ? PROT_EXEC : 0);
+
+        if(proc_mm){
+                struct proc_mm_op map;
+                int fd = mm_idp->u.mm_fd;
+
+                map = ((struct proc_mm_op) { .op        = MM_MMAP,
+                                       .u               =
+                                       { .mmap  =
+                                         { .addr        = virt,
+                                           .len = len,
+                                           .prot        = prot,
+                                           .flags       = MAP_SHARED |
+                                           MAP_FIXED,
+                                           .fd  = phys_fd,
+                                           .offset= offset
+                                         } } } );
                 ret = os_write_file(fd, &map, sizeof(map));
                 if(ret != sizeof(map))
                         printk("map : /proc/mm map failed, err = %d\n", -ret);
                 else ret = 0;
-        }
-        else {
-                unsigned long args[] = { virt, len, prot,
-                                         MAP_SHARED | MAP_FIXED, phys_fd,
-                                         MMAP_OFFSET(offset) };
+        }
+        else {
+                unsigned long args[] = { virt, len, prot,
+                                         MAP_SHARED | MAP_FIXED, phys_fd,
+                                         MMAP_OFFSET(offset) };
 
                 ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
                                        data, done);
-        }
+        }
 
         return ret;
 }
@@ -212,68 +216,66 @@ int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
 int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,
           void **data)
 {
-        int ret;
-
-        if(proc_mm){
-                struct proc_mm_op unmap;
-                int fd = mm_idp->u.mm_fd;
-
-                unmap = ((struct proc_mm_op) { .op      = MM_MUNMAP,
-                                               .u       =
-                                               { .munmap        =
-                                                 { .addr        =
-                                                   (unsigned long) addr,
-                                                   .len         = len } } } );
+        int ret;
+
+        if(proc_mm){
+                struct proc_mm_op unmap;
+                int fd = mm_idp->u.mm_fd;
+
+                unmap = ((struct proc_mm_op) { .op      = MM_MUNMAP,
+                                         .u     =
+                                         { .munmap      =
+                                           { .addr      =
+                                             (unsigned long) addr,
+                                             .len               = len } } } );
                 ret = os_write_file(fd, &unmap, sizeof(unmap));
                 if(ret != sizeof(unmap))
                         printk("unmap - proc_mm write returned %d\n", ret);
                 else ret = 0;
-        }
-        else {
-                unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
-                                         0 };
+        }
+        else {
+                unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
+                                         0 };
 
                 ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
                                        data, done);
-                if(ret < 0)
-                        printk("munmap stub failed, errno = %d\n", ret);
-        }
+        }
 
-        return ret;
+        return ret;
 }
 
 int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
             int r, int w, int x, int done, void **data)
 {
-        struct proc_mm_op protect;
-        int prot, ret;
-
-        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
-                (x ? PROT_EXEC : 0);
-
-        if(proc_mm){
-                int fd = mm_idp->u.mm_fd;
-                protect = ((struct proc_mm_op) { .op    = MM_MPROTECT,
-                                                 .u     =
-                                                 { .mprotect    =
-                                                   { .addr      =
-                                                     (unsigned long) addr,
-                                                     .len       = len,
-                                                     .prot      = prot } } } );
-
-                ret = os_write_file(fd, &protect, sizeof(protect));
-                if(ret != sizeof(protect))
-                        printk("protect failed, err = %d", -ret);
-                else ret = 0;
-        }
-        else {
-                unsigned long args[] = { addr, len, prot, 0, 0, 0 };
-
-                ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
-                                       data, done);
-        }
-
-        return ret;
+        struct proc_mm_op protect;
+        int prot, ret;
+
+        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+                (x ? PROT_EXEC : 0);
+        if(proc_mm){
+                int fd = mm_idp->u.mm_fd;
+
+                protect = ((struct proc_mm_op) { .op    = MM_MPROTECT,
+                                           .u   =
+                                           { .mprotect  =
+                                             { .addr    =
+                                               (unsigned long) addr,
+                                               .len     = len,
+                                               .prot    = prot } } } );
+
+                ret = os_write_file(fd, &protect, sizeof(protect));
+                if(ret != sizeof(protect))
+                        printk("protect failed, err = %d", -ret);
+                else ret = 0;
+        }
+        else {
+                unsigned long args[] = { addr, len, prot, 0, 0, 0 };
+
+                ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
+                                       data, done);
+        }
+
+        return ret;
 }
 
 void before_mem_skas(unsigned long unused)