305 lines
7.1 KiB
C
305 lines
7.1 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/compat.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.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/security.h>
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#include <asm/cpu.h>
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#include <asm/dsp.h>
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#include <asm/fpu.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/reg.h>
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#include <linux/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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long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
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compat_ulong_t caddr, compat_ulong_t cdata)
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{
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int addr = caddr;
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int data = cdata;
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int ret;
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switch (request) {
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/*
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* Read 4 bytes of the other process' storage
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* data is a pointer specifying where the user wants the
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* 4 bytes copied into
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* addr is a pointer in the user's storage that contains an 8 byte
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* address in the other process of the 4 bytes that is to be read
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* (this is run in a 32-bit process looking at a 64-bit process)
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* when I and D space are separate, these will need to be fixed.
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*/
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case PTRACE_PEEKTEXT_3264:
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case PTRACE_PEEKDATA_3264: {
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u32 tmp;
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int copied;
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u32 __user * addrOthers;
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ret = -EIO;
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/* Get the addr in the other process that we want to read */
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if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
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break;
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copied = ptrace_access_vm(child, (u64)addrOthers, &tmp,
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sizeof(tmp), FOLL_FORCE);
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp, (u32 __user *) (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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union fpureg *fregs;
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unsigned int tmp;
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regs = task_pt_regs(child);
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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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/* FP not yet used */
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tmp = -1;
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break;
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}
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fregs = get_fpu_regs(child);
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if (test_thread_flag(TIF_32BIT_FPREGS)) {
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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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tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
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addr & 1);
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break;
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}
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tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
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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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tmp = child->thread.fpu.fcr31;
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break;
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case FPC_EIR:
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/* implementation / version register */
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tmp = boot_cpu_data.fpu_id;
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break;
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case DSP_BASE ... DSP_BASE + 5: {
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dspreg_t *dregs;
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if (!cpu_has_dsp) {
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tmp = 0;
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ret = -EIO;
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goto out;
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}
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dregs = __get_dsp_regs(child);
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tmp = (unsigned long) (dregs[addr - DSP_BASE]);
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break;
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}
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case DSP_CONTROL:
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if (!cpu_has_dsp) {
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tmp = 0;
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ret = -EIO;
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goto out;
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}
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tmp = child->thread.dsp.dspcontrol;
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break;
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default:
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tmp = 0;
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ret = -EIO;
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goto out;
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}
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ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
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break;
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}
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/*
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* Write 4 bytes into the other process' storage
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* data is the 4 bytes that the user wants written
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* addr is a pointer in the user's storage that contains an
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* 8 byte address in the other process where the 4 bytes
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* that is to be written
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* (this is run in a 32-bit process looking at a 64-bit process)
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* when I and D space are separate, these will need to be fixed.
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*/
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case PTRACE_POKETEXT_3264:
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case PTRACE_POKEDATA_3264: {
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u32 __user * addrOthers;
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/* Get the addr in the other process that we want to write into */
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ret = -EIO;
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if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
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break;
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ret = 0;
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if (ptrace_access_vm(child, (u64)addrOthers, &data,
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sizeof(data),
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FOLL_FORCE | FOLL_WRITE) == sizeof(data))
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break;
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ret = -EIO;
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break;
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}
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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 = task_pt_regs(child);
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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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union fpureg *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, ~0,
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sizeof(child->thread.fpu));
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child->thread.fpu.fcr31 = 0;
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}
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if (test_thread_flag(TIF_32BIT_FPREGS)) {
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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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set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
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addr & 1, data);
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break;
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}
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set_fpr64(&fregs[addr - FPR_BASE], 0, data);
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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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child->thread.fpu.fcr31 = data;
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break;
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case DSP_BASE ... DSP_BASE + 5: {
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dspreg_t *dregs;
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if (!cpu_has_dsp) {
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ret = -EIO;
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break;
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}
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dregs = __get_dsp_regs(child);
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dregs[addr - DSP_BASE] = data;
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break;
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}
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case DSP_CONTROL:
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if (!cpu_has_dsp) {
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ret = -EIO;
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break;
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}
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child->thread.dsp.dspcontrol = 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_GETREGS:
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ret = ptrace_getregs(child,
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(struct user_pt_regs __user *) (__u64) data);
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break;
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case PTRACE_SETREGS:
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ret = ptrace_setregs(child,
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(struct user_pt_regs __user *) (__u64) data);
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break;
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case PTRACE_GETFPREGS:
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ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
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break;
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case PTRACE_SETFPREGS:
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ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
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break;
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case PTRACE_GET_THREAD_AREA:
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ret = put_user(task_thread_info(child)->tp_value,
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(unsigned int __user *) (unsigned long) data);
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break;
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case PTRACE_GET_THREAD_AREA_3264:
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ret = put_user(task_thread_info(child)->tp_value,
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(unsigned long __user *) (unsigned long) data);
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break;
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case PTRACE_GET_WATCH_REGS:
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ret = ptrace_get_watch_regs(child,
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(struct pt_watch_regs __user *) (unsigned long) addr);
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break;
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case PTRACE_SET_WATCH_REGS:
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ret = ptrace_set_watch_regs(child,
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(struct pt_watch_regs __user *) (unsigned long) addr);
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break;
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default:
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ret = compat_ptrace_request(child, request, addr, data);
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break;
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}
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out:
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return ret;
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}
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