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[SPARC32]: Add user regset support.
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It is missing lazy FPU handling for the current task,
but that can be added later.

Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed Feb 7, 2008
1 parent d09c2a2 commit 8e3fe80
Showing 1 changed file with 284 additions and 1 deletion.
285 changes: 284 additions & 1 deletion arch/sparc/kernel/ptrace.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/* ptrace.c: Sparc process tracing support.
*
* Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
*
* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
* and David Mosberger.
Expand All @@ -19,6 +19,8 @@
#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>
Expand Down Expand Up @@ -258,6 +260,287 @@ 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++, &reg_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, &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++, &reg_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, &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;
}

asmlinkage void do_ptrace(struct pt_regs *regs)
{
unsigned long request = regs->u_regs[UREG_I0];
Expand Down

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