291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1992 Ross Biro
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* Copyright (C) Linus Torvalds
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* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
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* Copyright (C) 1996 David S. Miller
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999 MIPS Technologies, Inc.
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* Copyright (C) 2000 Ulf Carlsson
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*
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* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
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* binaries.
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*/
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#include <linux/compiler.h>
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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/errno.h>
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#include <linux/ptrace.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <asm/cpu.h>
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#include <asm/fpu.h>
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#include <asm/mipsregs.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/bootinfo.h>
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/*
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* Tracing a 32-bit process with a 64-bit strace and vice versa will not
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* work. I don't know how to fix this.
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*/
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asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
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{
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struct task_struct *child;
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int ret;
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#if 0
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printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
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(int) request, (int) pid, (unsigned long) addr,
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(unsigned long) data);
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#endif
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lock_kernel();
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ret = -EPERM;
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if (request == PTRACE_TRACEME) {
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED)
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goto out;
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if ((ret = security_ptrace(current->parent, current)))
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goto out;
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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ret = 0;
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goto out;
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}
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ret = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child)
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goto out;
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ret = -EPERM;
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if (pid == 1) /* you may not mess with init */
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goto out_tsk;
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if (request == PTRACE_ATTACH) {
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ret = ptrace_attach(child);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out_tsk;
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switch (request) {
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/* when I and D space are separate, these will need to be fixed. */
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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unsigned int tmp;
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int copied;
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copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
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ret = -EIO;
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp, (unsigned int *) (unsigned long) data);
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break;
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}
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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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struct pt_regs *regs;
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unsigned int tmp;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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ret = 0; /* Default return value. */
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switch (addr) {
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case 0 ... 31:
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tmp = regs->regs[addr];
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break;
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case FPR_BASE ... FPR_BASE + 31:
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if (tsk_used_math(child)) {
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fpureg_t *fregs = get_fpu_regs(child);
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/*
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* The odd registers are actually the high
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* order bits of the values stored in the even
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* registers - unless we're using r2k_switch.S.
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*/
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if (addr & 1)
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tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
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else
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tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
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} else {
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tmp = -1; /* FP not yet used */
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}
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break;
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case PC:
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tmp = regs->cp0_epc;
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break;
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case CAUSE:
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tmp = regs->cp0_cause;
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break;
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case BADVADDR:
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tmp = regs->cp0_badvaddr;
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break;
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case MMHI:
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tmp = regs->hi;
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break;
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case MMLO:
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tmp = regs->lo;
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break;
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case FPC_CSR:
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if (cpu_has_fpu)
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tmp = child->thread.fpu.hard.fcr31;
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else
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tmp = child->thread.fpu.soft.fcr31;
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break;
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case FPC_EIR: { /* implementation / version register */
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unsigned int flags;
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if (!cpu_has_fpu)
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break;
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flags = read_c0_status();
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__enable_fpu();
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__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
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write_c0_status(flags);
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break;
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}
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default:
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tmp = 0;
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ret = -EIO;
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goto out_tsk;
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}
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ret = put_user(tmp, (unsigned *) (unsigned long) data);
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break;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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ret = 0;
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if (access_process_vm(child, addr, &data, sizeof(data), 1)
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== sizeof(data))
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break;
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ret = -EIO;
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break;
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case PTRACE_POKEUSR: {
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struct pt_regs *regs;
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ret = 0;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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switch (addr) {
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case 0 ... 31:
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regs->regs[addr] = data;
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break;
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case FPR_BASE ... FPR_BASE + 31: {
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fpureg_t *fregs = get_fpu_regs(child);
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if (!tsk_used_math(child)) {
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/* FP not yet used */
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memset(&child->thread.fpu.hard, ~0,
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sizeof(child->thread.fpu.hard));
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child->thread.fpu.hard.fcr31 = 0;
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}
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/*
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* The odd registers are actually the high order bits
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* of the values stored in the even registers - unless
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* we're using r2k_switch.S.
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*/
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if (addr & 1) {
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fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
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fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
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} else {
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fregs[addr - FPR_BASE] &= ~0xffffffffLL;
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/* Must cast, lest sign extension fill upper
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bits! */
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fregs[addr - FPR_BASE] |= (unsigned int)data;
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}
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break;
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}
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case PC:
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regs->cp0_epc = data;
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break;
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case MMHI:
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regs->hi = data;
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break;
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case MMLO:
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regs->lo = data;
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break;
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case FPC_CSR:
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if (cpu_has_fpu)
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child->thread.fpu.hard.fcr31 = data;
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else
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child->thread.fpu.soft.fcr31 = data;
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break;
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default:
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/* The rest are not allowed. */
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ret = -EIO;
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break;
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}
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break;
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}
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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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if (!valid_signal(data))
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break;
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if (request == PTRACE_SYSCALL) {
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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else {
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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child->exit_code = data;
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wake_up_process(child);
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ret = 0;
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break;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL:
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ret = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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wake_up_process(child);
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break;
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case PTRACE_DETACH: /* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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break;
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case PTRACE_GETEVENTMSG:
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ret = put_user(child->ptrace_message,
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(unsigned int __user *) (unsigned long) data);
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break;
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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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out_tsk:
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put_task_struct(child);
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out:
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unlock_kernel();
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return ret;
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}
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