Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / nios2 / kernel / ptrace.c

diff --git a/kernel/arch/nios2/kernel/ptrace.c b/kernel/arch/nios2/kernel/ptrace.c
new file mode 100644 (file)
index 0000000..681dda9
--- /dev/null
+++ b/kernel/arch/nios2/kernel/ptrace.c
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2014 Altera Corporation
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ */
+
+#include <linux/elf.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ptrace.h>
+#include <linux/regset.h>
+#include <linux/sched.h>
+#include <linux/tracehook.h>
+#include <linux/uaccess.h>
+#include <linux/user.h>
+
+static int genregs_get(struct task_struct *target,
+                      const struct user_regset *regset,
+                      unsigned int pos, unsigned int count,
+                      void *kbuf, void __user *ubuf)
+{
+       const struct pt_regs *regs = task_pt_regs(target);
+       const struct switch_stack *sw = (struct switch_stack *)regs - 1;
+       int ret = 0;
+
+#define REG_O_ZERO_RANGE(START, END)           \
+       if (!ret)                                       \
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
+                       START * 4, (END * 4) + 4);
+
+#define REG_O_ONE(PTR, LOC)    \
+       if (!ret)                       \
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
+                       LOC * 4, (LOC * 4) + 4);
+
+#define REG_O_RANGE(PTR, START, END)   \
+       if (!ret)                               \
+               ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
+                       START * 4, (END * 4) + 4);
+
+       REG_O_ZERO_RANGE(PTR_R0, PTR_R0);
+       REG_O_RANGE(&regs->r1, PTR_R1, PTR_R7);
+       REG_O_RANGE(&regs->r8, PTR_R8, PTR_R15);
+       REG_O_RANGE(sw, PTR_R16, PTR_R23);
+       REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */
+       REG_O_ONE(&regs->gp, PTR_GP);
+       REG_O_ONE(&regs->sp, PTR_SP);
+       REG_O_ONE(&regs->fp, PTR_FP);
+       REG_O_ONE(&regs->ea, PTR_EA);
+       REG_O_ZERO_RANGE(PTR_BA, PTR_BA);
+       REG_O_ONE(&regs->ra, PTR_RA);
+       REG_O_ONE(&regs->ea, PTR_PC); /* use ea for PC */
+       if (!ret)
+               ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+                                        PTR_STATUS * 4, -1);
+
+       return ret;
+}
+
+/*
+ * Set the thread state from a regset passed in via ptrace
+ */
+static int genregs_set(struct task_struct *target,
+                      const struct user_regset *regset,
+                      unsigned int pos, unsigned int count,
+                      const void *kbuf, const void __user *ubuf)
+{
+       struct pt_regs *regs = task_pt_regs(target);
+       const struct switch_stack *sw = (struct switch_stack *)regs - 1;
+       int ret = 0;
+
+#define REG_IGNORE_RANGE(START, END)           \
+       if (!ret)                                       \
+               ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
+                       START * 4, (END * 4) + 4);
+
+#define REG_IN_ONE(PTR, LOC)   \
+       if (!ret)                       \
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
+                       (void *)(PTR), LOC * 4, (LOC * 4) + 4);
+
+#define REG_IN_RANGE(PTR, START, END)  \
+       if (!ret)                               \
+               ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
+                       (void *)(PTR), START * 4, (END * 4) + 4);
+
+       REG_IGNORE_RANGE(PTR_R0, PTR_R0);
+       REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
+       REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
+       REG_IN_RANGE(sw, PTR_R16, PTR_R23);
+       REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
+       REG_IN_ONE(&regs->gp, PTR_GP);
+       REG_IN_ONE(&regs->sp, PTR_SP);
+       REG_IN_ONE(&regs->fp, PTR_FP);
+       REG_IN_ONE(&regs->ea, PTR_EA);
+       REG_IGNORE_RANGE(PTR_BA, PTR_BA);
+       REG_IN_ONE(&regs->ra, PTR_RA);
+       REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
+       if (!ret)
+               ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                        PTR_STATUS * 4, -1);
+
+       return ret;
+}
+
+/*
+ * Define the register sets available on Nios2 under Linux
+ */
+enum nios2_regset {
+       REGSET_GENERAL,
+};
+
+static const struct user_regset nios2_regsets[] = {
+       [REGSET_GENERAL] = {
+               .core_note_type = NT_PRSTATUS,
+               .n = NUM_PTRACE_REG,
+               .size = sizeof(unsigned long),
+               .align = sizeof(unsigned long),
+               .get = genregs_get,
+               .set = genregs_set,
+       }
+};
+
+static const struct user_regset_view nios2_user_view = {
+       .name = "nios2",
+       .e_machine = ELF_ARCH,
+       .ei_osabi = ELF_OSABI,
+       .regsets = nios2_regsets,
+       .n = ARRAY_SIZE(nios2_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+       return &nios2_user_view;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+
+}
+
+long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
+                unsigned long data)
+{
+       return ptrace_request(child, request, addr, data);
+}
+
+asmlinkage int do_syscall_trace_enter(void)
+{
+       int ret = 0;
+
+       if (test_thread_flag(TIF_SYSCALL_TRACE))
+               ret = tracehook_report_syscall_entry(task_pt_regs(current));
+
+       return ret;
+}
+
+asmlinkage void do_syscall_trace_exit(void)
+{
+       if (test_thread_flag(TIF_SYSCALL_TRACE))
+               tracehook_report_syscall_exit(task_pt_regs(current), 0);
+}