x86, um: ... and asm-x86 move

[linux-2.6-omap-h63xx.git] / arch / x86 / include / asm / syscall.h

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
new file mode 100644 (file)
index 0000000..04c47dc
--- /dev/null
+++ b/arch/x86/include/asm/syscall.h
@@ -0,0 +1,211 @@
+/*
+ * Access to user system call parameters and results
+ *
+ * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H 1
+
+#include <linux/sched.h>
+#include <linux/err.h>
+
+static inline long syscall_get_nr(struct task_struct *task,
+                                 struct pt_regs *regs)
+{
+       /*
+        * We always sign-extend a -1 value being set here,
+        * so this is always either -1L or a syscall number.
+        */
+       return regs->orig_ax;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                   struct pt_regs *regs)
+{
+       regs->ax = regs->orig_ax;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+       unsigned long error = regs->ax;
+#ifdef CONFIG_IA32_EMULATION
+       /*
+        * TS_COMPAT is set for 32-bit syscall entries and then
+        * remains set until we return to user mode.
+        */
+       if (task_thread_info(task)->status & TS_COMPAT)
+               /*
+                * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
+                * and will match correctly in comparisons.
+                */
+               error = (long) (int) error;
+#endif
+       return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                           struct pt_regs *regs)
+{
+       return regs->ax;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                           struct pt_regs *regs,
+                                           int error, long val)
+{
+       regs->ax = (long) error ?: val;
+}
+
+#ifdef CONFIG_X86_32
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+       BUG_ON(i + n > 6);
+       memcpy(args, &regs->bx + i, n * sizeof(args[0]));
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+       BUG_ON(i + n > 6);
+       memcpy(&regs->bx + i, args, n * sizeof(args[0]));
+}
+
+#else   /* CONFIG_X86_64 */
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+# ifdef CONFIG_IA32_EMULATION
+       if (task_thread_info(task)->status & TS_COMPAT)
+               switch (i + n) {
+               case 6:
+                       if (!n--) break;
+                       *args++ = regs->bp;
+               case 5:
+                       if (!n--) break;
+                       *args++ = regs->di;
+               case 4:
+                       if (!n--) break;
+                       *args++ = regs->si;
+               case 3:
+                       if (!n--) break;
+                       *args++ = regs->dx;
+               case 2:
+                       if (!n--) break;
+                       *args++ = regs->cx;
+               case 1:
+                       if (!n--) break;
+                       *args++ = regs->bx;
+               case 0:
+                       if (!n--) break;
+               default:
+                       BUG();
+                       break;
+               }
+       else
+# endif
+               switch (i + n) {
+               case 6:
+                       if (!n--) break;
+                       *args++ = regs->r9;
+               case 5:
+                       if (!n--) break;
+                       *args++ = regs->r8;
+               case 4:
+                       if (!n--) break;
+                       *args++ = regs->r10;
+               case 3:
+                       if (!n--) break;
+                       *args++ = regs->dx;
+               case 2:
+                       if (!n--) break;
+                       *args++ = regs->si;
+               case 1:
+                       if (!n--) break;
+                       *args++ = regs->di;
+               case 0:
+                       if (!n--) break;
+               default:
+                       BUG();
+                       break;
+               }
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+# ifdef CONFIG_IA32_EMULATION
+       if (task_thread_info(task)->status & TS_COMPAT)
+               switch (i + n) {
+               case 6:
+                       if (!n--) break;
+                       regs->bp = *args++;
+               case 5:
+                       if (!n--) break;
+                       regs->di = *args++;
+               case 4:
+                       if (!n--) break;
+                       regs->si = *args++;
+               case 3:
+                       if (!n--) break;
+                       regs->dx = *args++;
+               case 2:
+                       if (!n--) break;
+                       regs->cx = *args++;
+               case 1:
+                       if (!n--) break;
+                       regs->bx = *args++;
+               case 0:
+                       if (!n--) break;
+               default:
+                       BUG();
+               }
+       else
+# endif
+               switch (i + n) {
+               case 6:
+                       if (!n--) break;
+                       regs->r9 = *args++;
+               case 5:
+                       if (!n--) break;
+                       regs->r8 = *args++;
+               case 4:
+                       if (!n--) break;
+                       regs->r10 = *args++;
+               case 3:
+                       if (!n--) break;
+                       regs->dx = *args++;
+               case 2:
+                       if (!n--) break;
+                       regs->si = *args++;
+               case 1:
+                       if (!n--) break;
+                       regs->di = *args++;
+               case 0:
+                       if (!n--) break;
+               default:
+                       BUG();
+               }
+}
+
+#endif /* CONFIG_X86_32 */
+
+#endif /* _ASM_SYSCALL_H */