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-rw-r--r--kernel/arch/um/os-Linux/registers.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel/arch/um/os-Linux/registers.c b/kernel/arch/um/os-Linux/registers.c
new file mode 100644
index 000000000..2ff8d4fe8
--- /dev/null
+++ b/kernel/arch/um/os-Linux/registers.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ptrace.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/ptrace_user.h>
+#include <registers.h>
+
+int save_registers(int pid, struct uml_pt_regs *regs)
+{
+ int err;
+
+ err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+int restore_registers(int pid, struct uml_pt_regs *regs)
+{
+ int err;
+
+ err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+/* This is set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[MAX_REG_NR];
+static unsigned long exec_fp_regs[FP_SIZE];
+
+int init_registers(int pid)
+{
+ int err;
+
+ err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
+ if (err < 0)
+ return -errno;
+
+ arch_init_registers(pid);
+ get_fp_registers(pid, exec_fp_regs);
+ return 0;
+}
+
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
+{
+ memcpy(regs, exec_regs, sizeof(exec_regs));
+
+ if (fp_regs)
+ memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
+}