6c79759eca
When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point, so remove the related ptrace support. Besides removing code which should not be needed, this prepares us for the removal of FPU state in struct task_struct which this code requires. Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/21008/ Cc: linux-mips@linux-mips.org
319 lines
7.4 KiB
C
319 lines
7.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 1992 Ross Biro
|
|
* Copyright (C) Linus Torvalds
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
|
|
* Copyright (C) 1996 David S. Miller
|
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999 MIPS Technologies, Inc.
|
|
* Copyright (C) 2000 Ulf Carlsson
|
|
*
|
|
* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
|
|
* binaries.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/security.h>
|
|
|
|
#include <asm/cpu.h>
|
|
#include <asm/dsp.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/mipsmtregs.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/reg.h>
|
|
#include <asm/syscall.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
/*
|
|
* Tracing a 32-bit process with a 64-bit strace and vice versa will not
|
|
* work. I don't know how to fix this.
|
|
*/
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
compat_ulong_t caddr, compat_ulong_t cdata)
|
|
{
|
|
int addr = caddr;
|
|
int data = cdata;
|
|
int ret;
|
|
|
|
switch (request) {
|
|
|
|
/*
|
|
* Read 4 bytes of the other process' storage
|
|
* data is a pointer specifying where the user wants the
|
|
* 4 bytes copied into
|
|
* addr is a pointer in the user's storage that contains an 8 byte
|
|
* address in the other process of the 4 bytes that is to be read
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
* when I and D space are separate, these will need to be fixed.
|
|
*/
|
|
case PTRACE_PEEKTEXT_3264:
|
|
case PTRACE_PEEKDATA_3264: {
|
|
u32 tmp;
|
|
int copied;
|
|
u32 __user * addrOthers;
|
|
|
|
ret = -EIO;
|
|
|
|
/* Get the addr in the other process that we want to read */
|
|
if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
|
|
break;
|
|
|
|
copied = ptrace_access_vm(child, (u64)addrOthers, &tmp,
|
|
sizeof(tmp), FOLL_FORCE);
|
|
if (copied != sizeof(tmp))
|
|
break;
|
|
ret = put_user(tmp, (u32 __user *) (unsigned long) data);
|
|
break;
|
|
}
|
|
|
|
/* Read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
struct pt_regs *regs;
|
|
unsigned int tmp;
|
|
|
|
regs = task_pt_regs(child);
|
|
ret = 0; /* Default return value. */
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
tmp = regs->regs[addr];
|
|
break;
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
case FPR_BASE ... FPR_BASE + 31: {
|
|
union fpureg *fregs;
|
|
|
|
if (!tsk_used_math(child)) {
|
|
/* FP not yet used */
|
|
tmp = -1;
|
|
break;
|
|
}
|
|
fregs = get_fpu_regs(child);
|
|
if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
|
|
/*
|
|
* The odd registers are actually the high
|
|
* order bits of the values stored in the even
|
|
* registers.
|
|
*/
|
|
tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
|
|
addr & 1);
|
|
break;
|
|
}
|
|
tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
|
|
break;
|
|
}
|
|
case FPC_CSR:
|
|
tmp = child->thread.fpu.fcr31;
|
|
break;
|
|
case FPC_EIR:
|
|
/* implementation / version register */
|
|
tmp = boot_cpu_data.fpu_id;
|
|
break;
|
|
#endif /* CONFIG_MIPS_FP_SUPPORT */
|
|
case PC:
|
|
tmp = regs->cp0_epc;
|
|
break;
|
|
case CAUSE:
|
|
tmp = regs->cp0_cause;
|
|
break;
|
|
case BADVADDR:
|
|
tmp = regs->cp0_badvaddr;
|
|
break;
|
|
case MMHI:
|
|
tmp = regs->hi;
|
|
break;
|
|
case MMLO:
|
|
tmp = regs->lo;
|
|
break;
|
|
case DSP_BASE ... DSP_BASE + 5: {
|
|
dspreg_t *dregs;
|
|
|
|
if (!cpu_has_dsp) {
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
dregs = __get_dsp_regs(child);
|
|
tmp = dregs[addr - DSP_BASE];
|
|
break;
|
|
}
|
|
case DSP_CONTROL:
|
|
if (!cpu_has_dsp) {
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
tmp = child->thread.dsp.dspcontrol;
|
|
break;
|
|
default:
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Write 4 bytes into the other process' storage
|
|
* data is the 4 bytes that the user wants written
|
|
* addr is a pointer in the user's storage that contains an
|
|
* 8 byte address in the other process where the 4 bytes
|
|
* that is to be written
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
* when I and D space are separate, these will need to be fixed.
|
|
*/
|
|
case PTRACE_POKETEXT_3264:
|
|
case PTRACE_POKEDATA_3264: {
|
|
u32 __user * addrOthers;
|
|
|
|
/* Get the addr in the other process that we want to write into */
|
|
ret = -EIO;
|
|
if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
|
|
break;
|
|
ret = 0;
|
|
if (ptrace_access_vm(child, (u64)addrOthers, &data,
|
|
sizeof(data),
|
|
FOLL_FORCE | FOLL_WRITE) == sizeof(data))
|
|
break;
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_POKEUSR: {
|
|
struct pt_regs *regs;
|
|
ret = 0;
|
|
regs = task_pt_regs(child);
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
regs->regs[addr] = data;
|
|
/* System call number may have been changed */
|
|
if (addr == 2)
|
|
mips_syscall_update_nr(child, regs);
|
|
else if (addr == 4 &&
|
|
mips_syscall_is_indirect(child, regs))
|
|
mips_syscall_update_nr(child, regs);
|
|
break;
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
case FPR_BASE ... FPR_BASE + 31: {
|
|
union fpureg *fregs = get_fpu_regs(child);
|
|
|
|
if (!tsk_used_math(child)) {
|
|
/* FP not yet used */
|
|
memset(&child->thread.fpu, ~0,
|
|
sizeof(child->thread.fpu));
|
|
child->thread.fpu.fcr31 = 0;
|
|
}
|
|
if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
|
|
/*
|
|
* The odd registers are actually the high
|
|
* order bits of the values stored in the even
|
|
* registers.
|
|
*/
|
|
set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
|
|
addr & 1, data);
|
|
break;
|
|
}
|
|
set_fpr64(&fregs[addr - FPR_BASE], 0, data);
|
|
break;
|
|
}
|
|
case FPC_CSR:
|
|
child->thread.fpu.fcr31 = data;
|
|
break;
|
|
#endif /* CONFIG_MIPS_FP_SUPPORT */
|
|
case PC:
|
|
regs->cp0_epc = data;
|
|
break;
|
|
case MMHI:
|
|
regs->hi = data;
|
|
break;
|
|
case MMLO:
|
|
regs->lo = data;
|
|
break;
|
|
case DSP_BASE ... DSP_BASE + 5: {
|
|
dspreg_t *dregs;
|
|
|
|
if (!cpu_has_dsp) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
dregs = __get_dsp_regs(child);
|
|
dregs[addr - DSP_BASE] = data;
|
|
break;
|
|
}
|
|
case DSP_CONTROL:
|
|
if (!cpu_has_dsp) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
child->thread.dsp.dspcontrol = data;
|
|
break;
|
|
default:
|
|
/* The rest are not allowed. */
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETREGS:
|
|
ret = ptrace_getregs(child,
|
|
(struct user_pt_regs __user *) (__u64) data);
|
|
break;
|
|
|
|
case PTRACE_SETREGS:
|
|
ret = ptrace_setregs(child,
|
|
(struct user_pt_regs __user *) (__u64) data);
|
|
break;
|
|
|
|
#ifdef CONFIG_MIPS_FP_SUPPORT
|
|
case PTRACE_GETFPREGS:
|
|
ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS:
|
|
ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
|
|
break;
|
|
#endif
|
|
case PTRACE_GET_THREAD_AREA:
|
|
ret = put_user(task_thread_info(child)->tp_value,
|
|
(unsigned int __user *) (unsigned long) data);
|
|
break;
|
|
|
|
case PTRACE_GET_THREAD_AREA_3264:
|
|
ret = put_user(task_thread_info(child)->tp_value,
|
|
(unsigned long __user *) (unsigned long) data);
|
|
break;
|
|
|
|
case PTRACE_GET_WATCH_REGS:
|
|
ret = ptrace_get_watch_regs(child,
|
|
(struct pt_watch_regs __user *) (unsigned long) addr);
|
|
break;
|
|
|
|
case PTRACE_SET_WATCH_REGS:
|
|
ret = ptrace_set_watch_regs(child,
|
|
(struct pt_watch_regs __user *) (unsigned long) addr);
|
|
break;
|
|
|
|
default:
|
|
ret = compat_ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|