diff options
Diffstat (limited to 'arch/um/os-Linux/registers.c')
-rw-r--r-- | arch/um/os-Linux/registers.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c new file mode 100644 index 00000000000..a32ba6ab121 --- /dev/null +++ b/arch/um/os-Linux/registers.c @@ -0,0 +1,57 @@ +/* + * 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 "user.h" + +/* This is set once at boot time and not changed thereafter */ + +static unsigned long exec_regs[MAX_REG_NR]; + +void init_thread_registers(struct uml_pt_regs *to) +{ + memcpy(to->gp, exec_regs, sizeof(to->gp)); +} + +void save_registers(int pid, struct uml_pt_regs *regs) +{ + int err; + + err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp); + if (err < 0) + panic("save_registers - saving registers failed, errno = %d\n", + errno); +} + +void restore_registers(int pid, struct uml_pt_regs *regs) +{ + int err; + + err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp); + if (err < 0) + panic("restore_registers - saving registers failed, " + "errno = %d\n", errno); +} + +void init_registers(int pid) +{ + int err; + + err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs); + if (err) + panic("check_ptrace : PTRACE_GETREGS failed, errno = %d", + errno); + + arch_init_registers(pid); +} + +void get_safe_registers(unsigned long *regs) +{ + memcpy(regs, exec_regs, sizeof(exec_regs)); +} |