469 lines
10 KiB
C
469 lines
10 KiB
C
/* ptrace.c: Sparc process tracing support.
|
|
*
|
|
* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
|
|
*
|
|
* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
|
|
* and David Mosberger.
|
|
*
|
|
* Added Linux support -miguel (weird, eh?, the original code was meant
|
|
* to emulate SunOS).
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/security.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/regset.h>
|
|
#include <linux/elf.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/* #define ALLOW_INIT_TRACING */
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
enum sparc_regset {
|
|
REGSET_GENERAL,
|
|
REGSET_FP,
|
|
};
|
|
|
|
static int genregs32_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const struct pt_regs *regs = target->thread.kregs;
|
|
unsigned long __user *reg_window;
|
|
unsigned long *k = kbuf;
|
|
unsigned long __user *u = ubuf;
|
|
unsigned long reg;
|
|
|
|
if (target == current)
|
|
flush_user_windows();
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf) {
|
|
for (; count > 0 && pos < 16; count--)
|
|
*k++ = regs->u_regs[pos++];
|
|
|
|
reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(*k++, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 16; count--) {
|
|
if (put_user(regs->u_regs[pos++], u++))
|
|
return -EFAULT;
|
|
}
|
|
|
|
reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(reg, ®_window[pos++]) ||
|
|
put_user(reg, u++))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
while (count > 0) {
|
|
switch (pos) {
|
|
case 32: /* PSR */
|
|
reg = regs->psr;
|
|
break;
|
|
case 33: /* PC */
|
|
reg = regs->pc;
|
|
break;
|
|
case 34: /* NPC */
|
|
reg = regs->npc;
|
|
break;
|
|
case 35: /* Y */
|
|
reg = regs->y;
|
|
break;
|
|
case 36: /* WIM */
|
|
case 37: /* TBR */
|
|
reg = 0;
|
|
break;
|
|
default:
|
|
goto finish;
|
|
}
|
|
|
|
if (kbuf)
|
|
*k++ = reg;
|
|
else if (put_user(reg, u++))
|
|
return -EFAULT;
|
|
pos++;
|
|
count--;
|
|
}
|
|
finish:
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
|
|
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
38 * sizeof(reg), -1);
|
|
}
|
|
|
|
static int genregs32_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
struct pt_regs *regs = target->thread.kregs;
|
|
unsigned long __user *reg_window;
|
|
const unsigned long *k = kbuf;
|
|
const unsigned long __user *u = ubuf;
|
|
unsigned long reg;
|
|
|
|
if (target == current)
|
|
flush_user_windows();
|
|
|
|
pos /= sizeof(reg);
|
|
count /= sizeof(reg);
|
|
|
|
if (kbuf) {
|
|
for (; count > 0 && pos < 16; count--)
|
|
regs->u_regs[pos++] = *k++;
|
|
|
|
reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (put_user(*k++, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
for (; count > 0 && pos < 16; count--) {
|
|
if (get_user(reg, u++))
|
|
return -EFAULT;
|
|
regs->u_regs[pos++] = reg;
|
|
}
|
|
|
|
reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
|
|
for (; count > 0 && pos < 32; count--) {
|
|
if (get_user(reg, u++) ||
|
|
put_user(reg, ®_window[pos++]))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
while (count > 0) {
|
|
unsigned long psr;
|
|
|
|
if (kbuf)
|
|
reg = *k++;
|
|
else if (get_user(reg, u++))
|
|
return -EFAULT;
|
|
|
|
switch (pos) {
|
|
case 32: /* PSR */
|
|
psr = regs->psr;
|
|
psr &= ~PSR_ICC;
|
|
psr |= (reg & PSR_ICC);
|
|
regs->psr = psr;
|
|
break;
|
|
case 33: /* PC */
|
|
regs->pc = reg;
|
|
break;
|
|
case 34: /* NPC */
|
|
regs->npc = reg;
|
|
break;
|
|
case 35: /* Y */
|
|
regs->y = reg;
|
|
break;
|
|
case 36: /* WIM */
|
|
case 37: /* TBR */
|
|
break;
|
|
default:
|
|
goto finish;
|
|
}
|
|
|
|
pos++;
|
|
count--;
|
|
}
|
|
finish:
|
|
pos *= sizeof(reg);
|
|
count *= sizeof(reg);
|
|
|
|
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
38 * sizeof(reg), -1);
|
|
}
|
|
|
|
static int fpregs32_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const unsigned long *fpregs = target->thread.float_regs;
|
|
int ret = 0;
|
|
|
|
#if 0
|
|
if (target == current)
|
|
save_and_clear_fpu();
|
|
#endif
|
|
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
fpregs,
|
|
0, 32 * sizeof(u32));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
32 * sizeof(u32),
|
|
33 * sizeof(u32));
|
|
if (!ret)
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.fsr,
|
|
33 * sizeof(u32),
|
|
34 * sizeof(u32));
|
|
|
|
if (!ret) {
|
|
unsigned long val;
|
|
|
|
val = (1 << 8) | (8 << 16);
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&val,
|
|
34 * sizeof(u32),
|
|
35 * sizeof(u32));
|
|
}
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
35 * sizeof(u32), -1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fpregs32_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
unsigned long *fpregs = target->thread.float_regs;
|
|
int ret;
|
|
|
|
#if 0
|
|
if (target == current)
|
|
save_and_clear_fpu();
|
|
#endif
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
fpregs,
|
|
0, 32 * sizeof(u32));
|
|
if (!ret)
|
|
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
32 * sizeof(u32),
|
|
33 * sizeof(u32));
|
|
if (!ret && count > 0) {
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.fsr,
|
|
33 * sizeof(u32),
|
|
34 * sizeof(u32));
|
|
}
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
34 * sizeof(u32), -1);
|
|
return ret;
|
|
}
|
|
|
|
static const struct user_regset sparc32_regsets[] = {
|
|
/* Format is:
|
|
* G0 --> G7
|
|
* O0 --> O7
|
|
* L0 --> L7
|
|
* I0 --> I7
|
|
* PSR, PC, nPC, Y, WIM, TBR
|
|
*/
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = 38 * sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.get = genregs32_get, .set = genregs32_set
|
|
},
|
|
/* Format is:
|
|
* F0 --> F31
|
|
* empty 32-bit word
|
|
* FSR (32--bit word)
|
|
* FPU QUEUE COUNT (8-bit char)
|
|
* FPU QUEUE ENTRYSIZE (8-bit char)
|
|
* FPU ENABLED (8-bit char)
|
|
* empty 8-bit char
|
|
* FPU QUEUE (64 32-bit ints)
|
|
*/
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = 99 * sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.get = fpregs32_get, .set = fpregs32_set
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_sparc32_view = {
|
|
.name = "sparc", .e_machine = EM_SPARC,
|
|
.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
|
|
};
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
return &user_sparc32_view;
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
|
|
const struct user_regset_view *view;
|
|
int ret;
|
|
|
|
view = task_user_regset_view(child);
|
|
|
|
switch(request) {
|
|
case PTRACE_GETREGS: {
|
|
struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
|
|
|
|
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u32),
|
|
4 * sizeof(u32),
|
|
&pregs->psr);
|
|
if (!ret)
|
|
copy_regset_to_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u32),
|
|
15 * sizeof(u32),
|
|
&pregs->u_regs[0]);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETREGS: {
|
|
struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
|
|
|
|
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
32 * sizeof(u32),
|
|
4 * sizeof(u32),
|
|
&pregs->psr);
|
|
if (!ret)
|
|
copy_regset_from_user(child, view, REGSET_GENERAL,
|
|
1 * sizeof(u32),
|
|
15 * sizeof(u32),
|
|
&pregs->u_regs[0]);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETFPREGS: {
|
|
struct fps {
|
|
unsigned long regs[32];
|
|
unsigned long fsr;
|
|
unsigned long flags;
|
|
unsigned long extra;
|
|
unsigned long fpqd;
|
|
struct fq {
|
|
unsigned long *insnaddr;
|
|
unsigned long insn;
|
|
} fpq[16];
|
|
};
|
|
struct fps __user *fps = (struct fps __user *) addr;
|
|
|
|
ret = copy_regset_to_user(child, view, REGSET_FP,
|
|
0 * sizeof(u32),
|
|
32 * sizeof(u32),
|
|
&fps->regs[0]);
|
|
if (!ret)
|
|
ret = copy_regset_to_user(child, view, REGSET_FP,
|
|
33 * sizeof(u32),
|
|
1 * sizeof(u32),
|
|
&fps->fsr);
|
|
|
|
if (!ret) {
|
|
if (__put_user(0, &fps->fpqd) ||
|
|
__put_user(0, &fps->flags) ||
|
|
__put_user(0, &fps->extra) ||
|
|
clear_user(fps->fpq, sizeof(fps->fpq)))
|
|
ret = -EFAULT;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETFPREGS: {
|
|
struct fps {
|
|
unsigned long regs[32];
|
|
unsigned long fsr;
|
|
unsigned long flags;
|
|
unsigned long extra;
|
|
unsigned long fpqd;
|
|
struct fq {
|
|
unsigned long *insnaddr;
|
|
unsigned long insn;
|
|
} fpq[16];
|
|
};
|
|
struct fps __user *fps = (struct fps __user *) addr;
|
|
|
|
ret = copy_regset_from_user(child, view, REGSET_FP,
|
|
0 * sizeof(u32),
|
|
32 * sizeof(u32),
|
|
&fps->regs[0]);
|
|
if (!ret)
|
|
ret = copy_regset_from_user(child, view, REGSET_FP,
|
|
33 * sizeof(u32),
|
|
1 * sizeof(u32),
|
|
&fps->fsr);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_READTEXT:
|
|
case PTRACE_READDATA:
|
|
ret = ptrace_readdata(child, addr,
|
|
(void __user *) addr2, data);
|
|
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_WRITETEXT:
|
|
case PTRACE_WRITEDATA:
|
|
ret = ptrace_writedata(child, (void __user *) addr2,
|
|
addr, data);
|
|
|
|
if (ret == data)
|
|
ret = 0;
|
|
else if (ret >= 0)
|
|
ret = -EIO;
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage void syscall_trace(void)
|
|
{
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
return;
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
return;
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
|
|
? 0x80 : 0));
|
|
/*
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
* for normal use. strace only continues with a signal if the
|
|
* stopping signal is not SIGTRAP. -brl
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig (current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|