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-rw-r--r--arch/mn10300/kernel/ptrace.c385
1 files changed, 385 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/ptrace.c b/arch/mn10300/kernel/ptrace.c
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+++ b/arch/mn10300/kernel/ptrace.c
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+/* MN10300 Process tracing
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Modified by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, 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/regset.h>
+#include <linux/elf.h>
+#include <linux/tracehook.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/fpu.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * translate ptrace register IDs into struct pt_regs offsets
+ */
+static const u8 ptrace_regid_to_frame[] = {
+ [PT_A3 << 2] = REG_A3,
+ [PT_A2 << 2] = REG_A2,
+ [PT_D3 << 2] = REG_D3,
+ [PT_D2 << 2] = REG_D2,
+ [PT_MCVF << 2] = REG_MCVF,
+ [PT_MCRL << 2] = REG_MCRL,
+ [PT_MCRH << 2] = REG_MCRH,
+ [PT_MDRQ << 2] = REG_MDRQ,
+ [PT_E1 << 2] = REG_E1,
+ [PT_E0 << 2] = REG_E0,
+ [PT_E7 << 2] = REG_E7,
+ [PT_E6 << 2] = REG_E6,
+ [PT_E5 << 2] = REG_E5,
+ [PT_E4 << 2] = REG_E4,
+ [PT_E3 << 2] = REG_E3,
+ [PT_E2 << 2] = REG_E2,
+ [PT_SP << 2] = REG_SP,
+ [PT_LAR << 2] = REG_LAR,
+ [PT_LIR << 2] = REG_LIR,
+ [PT_MDR << 2] = REG_MDR,
+ [PT_A1 << 2] = REG_A1,
+ [PT_A0 << 2] = REG_A0,
+ [PT_D1 << 2] = REG_D1,
+ [PT_D0 << 2] = REG_D0,
+ [PT_ORIG_D0 << 2] = REG_ORIG_D0,
+ [PT_EPSW << 2] = REG_EPSW,
+ [PT_PC << 2] = REG_PC,
+};
+
+static inline int get_stack_long(struct task_struct *task, int offset)
+{
+ return *(unsigned long *)
+ ((unsigned long) task->thread.uregs + offset);
+}
+
+static inline
+int put_stack_long(struct task_struct *task, int offset, unsigned long data)
+{
+ unsigned long stack;
+
+ stack = (unsigned long) task->thread.uregs + offset;
+ *(unsigned long *) stack = data;
+ return 0;
+}
+
+/*
+ * retrieve the contents of MN10300 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 pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* we need to skip regs->next */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs, 0, PT_ORIG_D0 * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
+ NR_PTREGS * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ NR_PTREGS * sizeof(long), -1);
+}
+
+/*
+ * update the contents of the MN10300 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 pt_regs *regs = task_pt_regs(target);
+ unsigned long tmp;
+ int ret;
+
+ /* we need to skip regs->next */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs, 0, PT_ORIG_D0 * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
+ PT_EPSW * sizeof(long));
+ if (ret < 0)
+ return ret;
+
+ /* we need to mask off changes to EPSW */
+ tmp = regs->epsw;
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &tmp, PT_EPSW * sizeof(long),
+ PT_PC * sizeof(long));
+ tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
+ tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
+ EPSW_FLAG_Z);
+ regs->epsw = tmp;
+
+ if (ret < 0)
+ return ret;
+
+ /* and finally load the PC */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->pc, PT_PC * sizeof(long),
+ NR_PTREGS * sizeof(long));
+
+ if (ret < 0)
+ return ret;
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ NR_PTREGS * sizeof(long), -1);
+}
+
+/*
+ * retrieve the contents of MN10300 userspace FPU registers
+ */
+static int fpuregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
+ int ret;
+
+ unlazy_fpu(target);
+
+ 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 MN10300 userspace FPU registers
+ */
+static int fpuregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct fpu_state_struct fpu_state = target->thread.fpu_state;
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &fpu_state, 0, sizeof(fpu_state));
+ if (ret < 0)
+ return ret;
+
+ fpu_kill_state(target);
+ target->thread.fpu_state = fpu_state;
+ set_using_fpu(target);
+
+ return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(fpu_state), -1);
+}
+
+/*
+ * determine if the FPU registers have actually been used
+ */
+static int fpuregs_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return is_using_fpu(target) ? regset->n : 0;
+}
+
+/*
+ * Define the register sets available on the MN10300 under Linux
+ */
+enum mn10300_regset {
+ REGSET_GENERAL,
+ REGSET_FPU,
+};
+
+static const struct user_regset mn10300_regsets[] = {
+ /*
+ * General register format is:
+ * A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
+ * E1, E0, E7...E2, SP, LAR, LIR, MDR
+ * A1, A0, D1, D0, ORIG_D0, EPSW, PC
+ */
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+ /*
+ * FPU register format is:
+ * FS0-31, FPCR
+ */
+ [REGSET_FPU] = {
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct fpu_state_struct) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = fpuregs_get,
+ .set = fpuregs_set,
+ .active = fpuregs_active,
+ },
+};
+
+static const struct user_regset_view user_mn10300_native_view = {
+ .name = "mn10300",
+ .e_machine = EM_MN10300,
+ .regsets = mn10300_regsets,
+ .n = ARRAY_SIZE(mn10300_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_mn10300_native_view;
+}
+
+/*
+ * set the single-step bit
+ */
+void user_enable_single_step(struct task_struct *child)
+{
+#ifndef CONFIG_MN10300_USING_JTAG
+ struct user *dummy = NULL;
+ long tmp;
+
+ tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
+ tmp |= EPSW_T;
+ put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
+#endif
+}
+
+/*
+ * make sure the single-step bit is not set
+ */
+void user_disable_single_step(struct task_struct *child)
+{
+#ifndef CONFIG_MN10300_USING_JTAG
+ struct user *dummy = NULL;
+ long tmp;
+
+ tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
+ tmp &= ~EPSW_T;
+ put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
+#endif
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+ user_disable_single_step(child);
+}
+
+/*
+ * handle the arch-specific side of process tracing
+ */
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ unsigned long tmp;
+ int ret;
+ unsigned long __user *datap = (unsigned long __user *) data;
+
+ switch (request) {
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR:
+ ret = -EIO;
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
+ break;
+
+ tmp = 0; /* Default return condition */
+ if (addr < NR_PTREGS << 2)
+ tmp = get_stack_long(child,
+ ptrace_regid_to_frame[addr]);
+ ret = put_user(tmp, datap);
+ break;
+
+ /* write the word at location addr in the USER area */
+ case PTRACE_POKEUSR:
+ ret = -EIO;
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
+ break;
+
+ ret = 0;
+ if (addr < NR_PTREGS << 2)
+ ret = put_stack_long(child, ptrace_regid_to_frame[addr],
+ data);
+ break;
+
+ case PTRACE_GETREGS: /* Get all integer regs from the child. */
+ return copy_regset_to_user(child, &user_mn10300_native_view,
+ REGSET_GENERAL,
+ 0, NR_PTREGS * sizeof(long),
+ datap);
+
+ case PTRACE_SETREGS: /* Set all integer regs in the child. */
+ return copy_regset_from_user(child, &user_mn10300_native_view,
+ REGSET_GENERAL,
+ 0, NR_PTREGS * sizeof(long),
+ datap);
+
+ case PTRACE_GETFPREGS: /* Get the child FPU state. */
+ return copy_regset_to_user(child, &user_mn10300_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct fpu_state_struct),
+ datap);
+
+ case PTRACE_SETFPREGS: /* Set the child FPU state. */
+ return copy_regset_from_user(child, &user_mn10300_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct fpu_state_struct),
+ 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(struct pt_regs *regs)
+{
+ if (tracehook_report_syscall_entry(regs))
+ /* 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
+ * regs->orig_d0
+ */
+ return ULONG_MAX;
+
+ return regs->orig_d0;
+}
+
+/*
+ * handle tracing of system call exit
+ */
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+ tracehook_report_syscall_exit(regs, 0);
+}
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