![Mike Frysinger](/assets/img/avatar_default.png)
The Blackfin/FRV/SuperH guys all have the same exact FDPIC ptrace code in their arch handlers (since they were probably copied & pasted). Since these ptrace interfaces are an arch independent aspect of the FDPIC code, unify them in the common ptrace code so new FDPIC ports don't need to copy and paste this fundamental stuff yet again. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Roland McGrath <roland@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
381 lines
9 KiB
C
381 lines
9 KiB
C
/* ptrace.c: FRV specific parts of process tracing
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*
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* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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* - Derived from arch/m68k/kernel/ptrace.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <linux/regset.h>
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#include <linux/elf.h>
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#include <linux/tracehook.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/unistd.h>
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* retrieve the contents of FRV userspace general registers
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*/
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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const struct user_int_regs *iregs = &target->thread.user->i;
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int ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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iregs, 0, sizeof(*iregs));
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if (ret < 0)
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return ret;
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(*iregs), -1);
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}
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/*
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* update the contents of the FRV userspace general registers
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*/
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct user_int_regs *iregs = &target->thread.user->i;
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unsigned int offs_gr0, offs_gr1;
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int ret;
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/* not allowed to set PSR or __status */
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if (pos < offsetof(struct user_int_regs, psr) + sizeof(long) &&
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pos + count > offsetof(struct user_int_regs, psr))
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return -EIO;
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if (pos < offsetof(struct user_int_regs, __status) + sizeof(long) &&
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pos + count > offsetof(struct user_int_regs, __status))
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return -EIO;
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/* set the control regs */
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offs_gr0 = offsetof(struct user_int_regs, gr[0]);
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offs_gr1 = offsetof(struct user_int_regs, gr[1]);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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iregs, 0, offs_gr0);
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if (ret < 0)
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return ret;
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/* skip GR0/TBR */
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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offs_gr0, offs_gr1);
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if (ret < 0)
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return ret;
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/* set the general regs */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&iregs->gr[1], offs_gr1, sizeof(*iregs));
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if (ret < 0)
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return ret;
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(*iregs), -1);
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}
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/*
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* retrieve the contents of FRV userspace FP/Media registers
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*/
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static int fpmregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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const struct user_fpmedia_regs *fpregs = &target->thread.user->f;
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int ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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fpregs, 0, sizeof(*fpregs));
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if (ret < 0)
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return ret;
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(*fpregs), -1);
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}
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/*
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* update the contents of the FRV userspace FP/Media registers
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*/
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static int fpmregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct user_fpmedia_regs *fpregs = &target->thread.user->f;
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int ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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fpregs, 0, sizeof(*fpregs));
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if (ret < 0)
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return ret;
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(*fpregs), -1);
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}
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/*
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* determine if the FP/Media registers have actually been used
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*/
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static int fpmregs_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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return tsk_used_math(target) ? regset->n : 0;
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}
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/*
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* Define the register sets available on the FRV under Linux
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*/
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enum frv_regset {
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REGSET_GENERAL,
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REGSET_FPMEDIA,
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};
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static const struct user_regset frv_regsets[] = {
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/*
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* General register format is:
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* PSR, ISR, CCR, CCCR, LR, LCR, PC, (STATUS), SYSCALLNO, ORIG_G8
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* GNER0-1, IACC0, TBR, GR1-63
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(long),
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.align = sizeof(long),
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.get = genregs_get,
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.set = genregs_set,
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},
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/*
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* FPU/Media register format is:
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* FR0-63, FNER0-1, MSR0-1, ACC0-7, ACCG0-8, FSR
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*/
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[REGSET_FPMEDIA] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fpmedia_regs) / sizeof(long),
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.size = sizeof(long),
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.align = sizeof(long),
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.get = fpmregs_get,
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.set = fpmregs_set,
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.active = fpmregs_active,
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},
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};
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static const struct user_regset_view user_frv_native_view = {
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.name = "frv",
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.e_machine = EM_FRV,
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.regsets = frv_regsets,
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.n = ARRAY_SIZE(frv_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_frv_native_view;
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}
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/*
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* Get contents of register REGNO in task TASK.
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*/
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static inline long get_reg(struct task_struct *task, int regno)
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{
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struct user_context *user = task->thread.user;
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if (regno < 0 || regno >= PT__END)
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return 0;
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return ((unsigned long *) user)[regno];
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int put_reg(struct task_struct *task, int regno,
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unsigned long data)
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{
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struct user_context *user = task->thread.user;
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if (regno < 0 || regno >= PT__END)
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return -EIO;
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switch (regno) {
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case PT_GR(0):
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return 0;
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case PT_PSR:
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case PT__STATUS:
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return -EIO;
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default:
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((unsigned long *) user)[regno] = data;
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return 0;
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}
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}
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Control h/w single stepping
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*/
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void user_enable_single_step(struct task_struct *child)
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{
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child->thread.frame0->__status |= REG__STATUS_STEP;
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}
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void user_disable_single_step(struct task_struct *child)
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{
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child->thread.frame0->__status &= ~REG__STATUS_STEP;
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}
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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unsigned long tmp;
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int ret;
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switch (request) {
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/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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tmp = 0;
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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ret = 0;
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switch (addr >> 2) {
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case 0 ... PT__END - 1:
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tmp = get_reg(child, addr >> 2);
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break;
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case PT__END + 0:
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tmp = child->mm->end_code - child->mm->start_code;
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break;
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case PT__END + 1:
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tmp = child->mm->end_data - child->mm->start_data;
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break;
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case PT__END + 2:
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tmp = child->mm->start_stack - child->mm->start_brk;
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break;
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case PT__END + 3:
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tmp = child->mm->start_code;
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break;
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case PT__END + 4:
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tmp = child->mm->start_stack;
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break;
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default:
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ret = -EIO;
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break;
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}
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if (ret == 0)
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ret = put_user(tmp, (unsigned long *) data);
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break;
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}
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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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ret = 0;
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switch (addr >> 2) {
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case 0 ... PT__END - 1:
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ret = put_reg(child, addr >> 2, data);
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break;
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default:
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ret = -EIO;
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break;
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}
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break;
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case PTRACE_GETREGS: /* Get all integer regs from the child. */
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return copy_regset_to_user(child, &user_frv_native_view,
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REGSET_GENERAL,
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0, sizeof(child->thread.user->i),
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(void __user *)data);
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case PTRACE_SETREGS: /* Set all integer regs in the child. */
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return copy_regset_from_user(child, &user_frv_native_view,
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REGSET_GENERAL,
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0, sizeof(child->thread.user->i),
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(const void __user *)data);
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case PTRACE_GETFPREGS: /* Get the child FP/Media state. */
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return copy_regset_to_user(child, &user_frv_native_view,
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REGSET_FPMEDIA,
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0, sizeof(child->thread.user->f),
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(void __user *)data);
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case PTRACE_SETFPREGS: /* Set the child FP/Media state. */
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return copy_regset_from_user(child, &user_frv_native_view,
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REGSET_FPMEDIA,
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0, sizeof(child->thread.user->f),
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(const void __user *)data);
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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/*
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* handle tracing of system call entry
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* - return the revised system call number or ULONG_MAX to cause ENOSYS
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*/
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asmlinkage unsigned long syscall_trace_entry(void)
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{
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__frame->__status |= REG__STATUS_SYSC_ENTRY;
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if (tracehook_report_syscall_entry(__frame)) {
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/* tracing decided this syscall should not happen, so
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in
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* __frame->syscallno
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*/
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return ULONG_MAX;
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}
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return __frame->syscallno;
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}
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/*
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* handle tracing of system call exit
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*/
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asmlinkage void syscall_trace_exit(void)
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{
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__frame->__status |= REG__STATUS_SYSC_EXIT;
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tracehook_report_syscall_exit(__frame, 0);
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}
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