diff options
Diffstat (limited to 'arch/m68k/kernel/ptrace_no.c')
| -rw-r--r-- | arch/m68k/kernel/ptrace_no.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/m68k/kernel/ptrace_no.c b/arch/m68k/kernel/ptrace_no.c new file mode 100644 index 00000000000..6709fb70733 --- /dev/null +++ b/arch/m68k/kernel/ptrace_no.c @@ -0,0 +1,255 @@ +/* + * linux/arch/m68knommu/kernel/ptrace.c + * + * Copyright (C) 1994 by Hamish Macdonald + * Taken from linux/kernel/ptrace.c and modified for M680x0. + * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds + * + * 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/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/signal.h> +#include <linux/tracehook.h> + +#include <asm/uaccess.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/system.h> +#include <asm/processor.h> + +/* + * does not yet catch signals sent when the child dies. + * in exit.c or in signal.c. + */ + +/* determines which bits in the SR the user has access to. */ +/* 1 = access 0 = no access */ +#define SR_MASK 0x001f + +/* sets the trace bits. */ +#define TRACE_BITS 0x8000 + +/* Find the stack offset for a register, relative to thread.esp0. */ +#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg) +#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \ + - sizeof(struct switch_stack)) +/* Mapping from PT_xxx to the stack offset at which the register is + saved. Notice that usp has no stack-slot and needs to be treated + specially (see get_reg/put_reg below). */ +static int regoff[] = { + PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4), + PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0), + PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4), + SW_REG(a5), SW_REG(a6), PT_REG(d0), -1, + PT_REG(orig_d0), PT_REG(sr), PT_REG(pc), +}; + +/* + * Get contents of register REGNO in task TASK. + */ +static inline long get_reg(struct task_struct *task, int regno) +{ + unsigned long *addr; + + if (regno == PT_USP) + addr = &task->thread.usp; + else if (regno < ARRAY_SIZE(regoff)) + addr = (unsigned long *)(task->thread.esp0 + regoff[regno]); + else + return 0; + return *addr; +} + +/* + * Write contents of register REGNO in task TASK. + */ +static inline int put_reg(struct task_struct *task, int regno, + unsigned long data) +{ + unsigned long *addr; + + if (regno == PT_USP) + addr = &task->thread.usp; + else if (regno < ARRAY_SIZE(regoff)) + addr = (unsigned long *) (task->thread.esp0 + regoff[regno]); + else + return -1; + *addr = data; + return 0; +} + +void user_enable_single_step(struct task_struct *task) +{ + unsigned long srflags; + srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16); + put_reg(task, PT_SR, srflags); +} + +void user_disable_single_step(struct task_struct *task) +{ + unsigned long srflags; + srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16); + put_reg(task, PT_SR, srflags); +} + +/* + * Called by kernel/ptrace.c when detaching.. + * + * Make sure the single step bit is not set. + */ +void ptrace_disable(struct task_struct *child) +{ + /* make sure the single step bit is not set. */ + user_disable_single_step(child); +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + 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: { + unsigned long tmp; + + ret = -EIO; + if ((addr & 3) || addr > sizeof(struct user) - 3) + break; + + tmp = 0; /* Default return condition */ + ret = -EIO; + if (regno < 19) { + tmp = get_reg(child, regno); + if (regno == PT_SR) + tmp >>= 16; + } else if (regno >= 21 && regno < 49) { + tmp = child->thread.fp[regno - 21]; + } else if (regno == 49) { + tmp = child->mm->start_code; + } else if (regno == 50) { + tmp = child->mm->start_data; + } else if (regno == 51) { + tmp = child->mm->end_code; + } else + break; + ret = put_user(tmp, datap); + break; + } + + case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ + ret = -EIO; + if ((addr & 3) || addr > sizeof(struct user) - 3) + break; + + if (regno == PT_SR) { + data &= SR_MASK; + data <<= 16; + data |= get_reg(child, PT_SR) & ~(SR_MASK << 16); + } + if (regno < 19) { + if (put_reg(child, regno, data)) + break; + ret = 0; + break; + } + if (regno >= 21 && regno < 48) + { + child->thread.fp[regno - 21] = data; + ret = 0; + } + break; + + case PTRACE_GETREGS: { /* Get all gp regs from the child. */ + int i; + unsigned long tmp; + for (i = 0; i < 19; i++) { + tmp = get_reg(child, i); + if (i == PT_SR) + tmp >>= 16; + if (put_user(tmp, datap)) { + ret = -EFAULT; + break; + } + datap++; + } + ret = 0; + break; + } + + case PTRACE_SETREGS: { /* Set all gp regs in the child. */ + int i; + unsigned long tmp; + for (i = 0; i < 19; i++) { + if (get_user(tmp, datap)) { + ret = -EFAULT; + break; + } + if (i == PT_SR) { + tmp &= SR_MASK; + tmp <<= 16; + tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16); + } + put_reg(child, i, tmp); + datap++; + } + ret = 0; + break; + } + +#ifdef PTRACE_GETFPREGS + case PTRACE_GETFPREGS: { /* Get the child FPU state. */ + ret = 0; + if (copy_to_user(datap, &child->thread.fp, + sizeof(struct user_m68kfp_struct))) + ret = -EFAULT; + break; + } +#endif + +#ifdef PTRACE_SETFPREGS + case PTRACE_SETFPREGS: { /* Set the child FPU state. */ + ret = 0; + if (copy_from_user(&child->thread.fp, datap, + sizeof(struct user_m68kfp_struct))) + ret = -EFAULT; + break; + } +#endif + + case PTRACE_GET_THREAD_AREA: + ret = put_user(task_thread_info(child)->tp_value, datap); + break; + + default: + ret = ptrace_request(child, request, addr, data); + break; + } + return ret; +} + +asmlinkage int 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 syscall_trace_leave(void) +{ + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(task_pt_regs(current), 0); +} |