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-rw-r--r--arch/frv/kernel/ptrace.c377
1 files changed, 377 insertions, 0 deletions
diff --git a/arch/frv/kernel/ptrace.c b/arch/frv/kernel/ptrace.c
new file mode 100644
index 000000000..3987ff88d
--- /dev/null
+++ b/arch/frv/kernel/ptrace.c
@@ -0,0 +1,377 @@
+/* ptrace.c: FRV specific parts of process tracing
+ *
+ * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from arch/m68k/kernel/ptrace.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/security.h>
+#include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
+#include <linux/tracehook.h>
+
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/unistd.h>
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/*
+ * retrieve the contents of FRV userspace general registers
+ */
+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 user_int_regs *iregs = &target->thread.user->i;
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ iregs, 0, sizeof(*iregs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(*iregs), -1);
+}
+
+/*
+ * update the contents of the FRV userspace general registers
+ */
+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 user_int_regs *iregs = &target->thread.user->i;
+ unsigned int offs_gr0, offs_gr1;
+ int ret;
+
+ /* not allowed to set PSR or __status */
+ if (pos < offsetof(struct user_int_regs, psr) + sizeof(long) &&
+ pos + count > offsetof(struct user_int_regs, psr))
+ return -EIO;
+
+ if (pos < offsetof(struct user_int_regs, __status) + sizeof(long) &&
+ pos + count > offsetof(struct user_int_regs, __status))
+ return -EIO;
+
+ /* set the control regs */
+ offs_gr0 = offsetof(struct user_int_regs, gr[0]);
+ offs_gr1 = offsetof(struct user_int_regs, gr[1]);
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ iregs, 0, offs_gr0);
+ if (ret < 0)
+ return ret;
+
+ /* skip GR0/TBR */
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ offs_gr0, offs_gr1);
+ if (ret < 0)
+ return ret;
+
+ /* set the general regs */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &iregs->gr[1], offs_gr1, sizeof(*iregs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(*iregs), -1);
+}
+
+/*
+ * retrieve the contents of FRV userspace FP/Media registers
+ */
+static int fpmregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct user_fpmedia_regs *fpregs = &target->thread.user->f;
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ fpregs, 0, sizeof(*fpregs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(*fpregs), -1);
+}
+
+/*
+ * update the contents of the FRV userspace FP/Media registers
+ */
+static int fpmregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct user_fpmedia_regs *fpregs = &target->thread.user->f;
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ fpregs, 0, sizeof(*fpregs));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(*fpregs), -1);
+}
+
+/*
+ * determine if the FP/Media registers have actually been used
+ */
+static int fpmregs_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return tsk_used_math(target) ? regset->n : 0;
+}
+
+/*
+ * Define the register sets available on the FRV under Linux
+ */
+enum frv_regset {
+ REGSET_GENERAL,
+ REGSET_FPMEDIA,
+};
+
+static const struct user_regset frv_regsets[] = {
+ /*
+ * General register format is:
+ * PSR, ISR, CCR, CCCR, LR, LCR, PC, (STATUS), SYSCALLNO, ORIG_G8
+ * GNER0-1, IACC0, TBR, GR1-63
+ */
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+ /*
+ * FPU/Media register format is:
+ * FR0-63, FNER0-1, MSR0-1, ACC0-7, ACCG0-8, FSR
+ */
+ [REGSET_FPMEDIA] = {
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct user_fpmedia_regs) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = fpmregs_get,
+ .set = fpmregs_set,
+ .active = fpmregs_active,
+ },
+};
+
+static const struct user_regset_view user_frv_native_view = {
+ .name = "frv",
+ .e_machine = EM_FRV,
+ .regsets = frv_regsets,
+ .n = ARRAY_SIZE(frv_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_frv_native_view;
+}
+
+/*
+ * Get contents of register REGNO in task TASK.
+ */
+static inline long get_reg(struct task_struct *task, int regno)
+{
+ struct user_context *user = task->thread.user;
+
+ if (regno < 0 || regno >= PT__END)
+ return 0;
+
+ return ((unsigned long *) user)[regno];
+}
+
+/*
+ * Write contents of register REGNO in task TASK.
+ */
+static inline int put_reg(struct task_struct *task, int regno,
+ unsigned long data)
+{
+ struct user_context *user = task->thread.user;
+
+ if (regno < 0 || regno >= PT__END)
+ return -EIO;
+
+ switch (regno) {
+ case PT_GR(0):
+ return 0;
+ case PT_PSR:
+ case PT__STATUS:
+ return -EIO;
+ default:
+ ((unsigned long *) user)[regno] = data;
+ return 0;
+ }
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Control h/w single stepping
+ */
+void user_enable_single_step(struct task_struct *child)
+{
+ child->thread.frame0->__status |= REG__STATUS_STEP;
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+ child->thread.frame0->__status &= ~REG__STATUS_STEP;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+ user_disable_single_step(child);
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ unsigned long tmp;
+ int ret;
+ int regno = addr >> 2;
+ unsigned long __user *datap = (unsigned long __user *) data;
+
+ switch (request) {
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ tmp = 0;
+ ret = -EIO;
+ if (addr & 3)
+ break;
+
+ ret = 0;
+ switch (regno) {
+ case 0 ... PT__END - 1:
+ tmp = get_reg(child, regno);
+ break;
+
+ case PT__END + 0:
+ tmp = child->mm->end_code - child->mm->start_code;
+ break;
+
+ case PT__END + 1:
+ tmp = child->mm->end_data - child->mm->start_data;
+ break;
+
+ case PT__END + 2:
+ tmp = child->mm->start_stack - child->mm->start_brk;
+ break;
+
+ case PT__END + 3:
+ tmp = child->mm->start_code;
+ break;
+
+ case PT__END + 4:
+ tmp = child->mm->start_stack;
+ break;
+
+ default:
+ ret = -EIO;
+ break;
+ }
+
+ if (ret == 0)
+ ret = put_user(tmp, datap);
+ break;
+ }
+
+ case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
+ ret = -EIO;
+ if (addr & 3)
+ break;
+
+ switch (regno) {
+ case 0 ... PT__END - 1:
+ ret = put_reg(child, regno, data);
+ break;
+ }
+ break;
+
+ case PTRACE_GETREGS: /* Get all integer regs from the child. */
+ return copy_regset_to_user(child, &user_frv_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(child->thread.user->i),
+ datap);
+
+ case PTRACE_SETREGS: /* Set all integer regs in the child. */
+ return copy_regset_from_user(child, &user_frv_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(child->thread.user->i),
+ datap);
+
+ case PTRACE_GETFPREGS: /* Get the child FP/Media state. */
+ return copy_regset_to_user(child, &user_frv_native_view,
+ REGSET_FPMEDIA,
+ 0, sizeof(child->thread.user->f),
+ datap);
+
+ case PTRACE_SETFPREGS: /* Set the child FP/Media state. */
+ return copy_regset_from_user(child, &user_frv_native_view,
+ REGSET_FPMEDIA,
+ 0, sizeof(child->thread.user->f),
+ datap);
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+ return ret;
+}
+
+/*
+ * handle tracing of system call entry
+ * - return the revised system call number or ULONG_MAX to cause ENOSYS
+ */
+asmlinkage unsigned long syscall_trace_entry(void)
+{
+ __frame->__status |= REG__STATUS_SYSC_ENTRY;
+ if (tracehook_report_syscall_entry(__frame)) {
+ /* tracing decided this syscall should not happen, so
+ * We'll return a bogus call number to get an ENOSYS
+ * error, but leave the original number in
+ * __frame->syscallno
+ */
+ return ULONG_MAX;
+ }
+
+ return __frame->syscallno;
+}
+
+/*
+ * handle tracing of system call exit
+ */
+asmlinkage void syscall_trace_exit(void)
+{
+ __frame->__status |= REG__STATUS_SYSC_EXIT;
+ tracehook_report_syscall_exit(__frame, 0);
+}
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