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190aa9f60f
linux/arch/sparc/kernel/ptrace.c
David S. Miller 190aa9f60f [SPARC]: Remove PTRACE_SUN* handling. 
Supporting SunOS ptrace() is pretty pointless and these
kinds of quirks keep us from being able to share more
code with other platforms.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-07 02:59:22 -08:00

826 lines
18 KiB
C
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/* 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 MAGIC_CONSTANT 0x80000000
/* Returning from ptrace is a bit tricky because the syscall return
* low level code assumes any value returned which is negative and
* is a valid errno will mean setting the condition codes to indicate
* an error return. This doesn't work, so we have this hook.
*/
static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
{
regs->u_regs[UREG_I0] = error;
regs->psr |= PSR_C;
regs->pc = regs->npc;
regs->npc += 4;
}
static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
{
regs->u_regs[UREG_I0] = value;
regs->psr &= ~PSR_C;
regs->pc = regs->npc;
regs->npc += 4;
}
static void
pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
{
if (put_user(value, addr)) {
pt_error_return(regs, EFAULT);
return;
}
regs->u_regs[UREG_I0] = 0;
regs->psr &= ~PSR_C;
regs->pc = regs->npc;
regs->npc += 4;
}
static void
pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
{
if (current->personality == PER_SUNOS)
pt_succ_return (regs, val);
else
pt_succ_return_linux (regs, val, addr);
}
/* Fuck me gently with a chainsaw... */
static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
struct task_struct *tsk, long __user *addr)
{
struct pt_regs *cregs = tsk->thread.kregs;
struct thread_info *t = task_thread_info(tsk);
int v;
if(offset >= 1024)
offset -= 1024; /* whee... */
if(offset & ((sizeof(unsigned long) - 1))) {
pt_error_return(regs, EIO);
return;
}
if(offset >= 16 && offset < 784) {
offset -= 16; offset >>= 2;
pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
return;
}
if(offset >= 784 && offset < 832) {
offset -= 784; offset >>= 2;
pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
return;
}
switch(offset) {
case 0:
v = t->ksp;
break;
case 4:
v = t->kpc;
break;
case 8:
v = t->kpsr;
break;
case 12:
v = t->uwinmask;
break;
case 832:
v = t->w_saved;
break;
case 896:
v = cregs->u_regs[UREG_I0];
break;
case 900:
v = cregs->u_regs[UREG_I1];
break;
case 904:
v = cregs->u_regs[UREG_I2];
break;
case 908:
v = cregs->u_regs[UREG_I3];
break;
case 912:
v = cregs->u_regs[UREG_I4];
break;
case 916:
v = cregs->u_regs[UREG_I5];
break;
case 920:
v = cregs->u_regs[UREG_I6];
break;
case 924:
if(tsk->thread.flags & MAGIC_CONSTANT)
v = cregs->u_regs[UREG_G1];
else
v = 0;
break;
case 940:
v = cregs->u_regs[UREG_I0];
break;
case 944:
v = cregs->u_regs[UREG_I1];
break;
case 948:
/* Isn't binary compatibility _fun_??? */
if(cregs->psr & PSR_C)
v = cregs->u_regs[UREG_I0] << 24;
else
v = 0;
break;
/* Rest of them are completely unsupported. */
default:
printk("%s [%d]: Wants to read user offset %ld\n",
current->comm, task_pid_nr(current), offset);
pt_error_return(regs, EIO);
return;
}
if (current->personality == PER_SUNOS)
pt_succ_return (regs, v);
else
pt_succ_return_linux (regs, v, addr);
return;
}
static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
struct task_struct *tsk)
{
struct pt_regs *cregs = tsk->thread.kregs;
struct thread_info *t = task_thread_info(tsk);
unsigned long value = regs->u_regs[UREG_I3];
if(offset >= 1024)
offset -= 1024; /* whee... */
if(offset & ((sizeof(unsigned long) - 1)))
goto failure;
if(offset >= 16 && offset < 784) {
offset -= 16; offset >>= 2;
*(((unsigned long *)(&t->reg_window[0]))+offset) = value;
goto success;
}
if(offset >= 784 && offset < 832) {
offset -= 784; offset >>= 2;
*(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
goto success;
}
switch(offset) {
case 896:
cregs->u_regs[UREG_I0] = value;
break;
case 900:
cregs->u_regs[UREG_I1] = value;
break;
case 904:
cregs->u_regs[UREG_I2] = value;
break;
case 908:
cregs->u_regs[UREG_I3] = value;
break;
case 912:
cregs->u_regs[UREG_I4] = value;
break;
case 916:
cregs->u_regs[UREG_I5] = value;
break;
case 920:
cregs->u_regs[UREG_I6] = value;
break;
case 924:
cregs->u_regs[UREG_I7] = value;
break;
case 940:
cregs->u_regs[UREG_I0] = value;
break;
case 944:
cregs->u_regs[UREG_I1] = value;
break;
/* Rest of them are completely unsupported or "no-touch". */
default:
printk("%s [%d]: Wants to write user offset %ld\n",
current->comm, task_pid_nr(current), offset);
goto failure;
}
success:
pt_succ_return(regs, 0);
return;
failure:
pt_error_return(regs, EIO);
return;
}
/* #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++, &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];
unsigned long pid = regs->u_regs[UREG_I1];
unsigned long addr = regs->u_regs[UREG_I2];
unsigned long data = regs->u_regs[UREG_I3];
unsigned long addr2 = regs->u_regs[UREG_I4];
struct task_struct *child;
int ret;
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
if (ret < 0)
pt_error_return(regs, -ret);
else
pt_succ_return(regs, 0);
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
pt_error_return(regs, -ret);
goto out;
}
if (request == PTRACE_ATTACH) {
if (ptrace_attach(child)) {
pt_error_return(regs, EPERM);
goto out_tsk;
}
pt_succ_return(regs, 0);
goto out_tsk;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0) {
pt_error_return(regs, -ret);
goto out_tsk;
}
switch(request) {
case PTRACE_PEEKTEXT: /* read word at location addr. */
case PTRACE_PEEKDATA: {
unsigned long tmp;
if (access_process_vm(child, addr,
&tmp, sizeof(tmp), 0) == sizeof(tmp))
pt_os_succ_return(regs, tmp, (long __user *)data);
else
pt_error_return(regs, EIO);
goto out_tsk;
}
case PTRACE_PEEKUSR:
read_sunos_user(regs, addr, child, (long __user *) data);
goto out_tsk;
case PTRACE_POKEUSR:
write_sunos_user(regs, addr, child);
goto out_tsk;
case PTRACE_POKETEXT: /* write the word at location addr. */
case PTRACE_POKEDATA: {
if (access_process_vm(child, addr,
&data, sizeof(data), 1) == sizeof(data))
pt_succ_return(regs, 0);
else
pt_error_return(regs, EIO);
goto out_tsk;
}
case PTRACE_GETREGS: {
struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
struct pt_regs *cregs = child->thread.kregs;
int rval;
if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
rval = -EFAULT;
pt_error_return(regs, -rval);
goto out_tsk;
}
__put_user(cregs->psr, (&pregs->psr));
__put_user(cregs->pc, (&pregs->pc));
__put_user(cregs->npc, (&pregs->npc));
__put_user(cregs->y, (&pregs->y));
for(rval = 1; rval < 16; rval++)
__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
pt_succ_return(regs, 0);
goto out_tsk;
}
case PTRACE_SETREGS: {
struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
struct pt_regs *cregs = child->thread.kregs;
unsigned long psr, pc, npc, y;
int i;
/* Must be careful, tracing process can only set certain
* bits in the psr.
*/
if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
pt_error_return(regs, EFAULT);
goto out_tsk;
}
__get_user(psr, (&pregs->psr));
__get_user(pc, (&pregs->pc));
__get_user(npc, (&pregs->npc));
__get_user(y, (&pregs->y));
psr &= PSR_ICC;
cregs->psr &= ~PSR_ICC;
cregs->psr |= psr;
if (!((pc | npc) & 3)) {
cregs->pc = pc;
cregs->npc =npc;
}
cregs->y = y;
for(i = 1; i < 16; i++)
__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
pt_succ_return(regs, 0);
goto out_tsk;
}
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;
int i;
if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
i = -EFAULT;
pt_error_return(regs, -i);
goto out_tsk;
}
for(i = 0; i < 32; i++)
__put_user(child->thread.float_regs[i], (&fps->regs[i]));
__put_user(child->thread.fsr, (&fps->fsr));
__put_user(child->thread.fpqdepth, (&fps->fpqd));
__put_user(0, (&fps->flags));
__put_user(0, (&fps->extra));
for(i = 0; i < 16; i++) {
__put_user(child->thread.fpqueue[i].insn_addr,
(&fps->fpq[i].insnaddr));
__put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
}
pt_succ_return(regs, 0);
goto out_tsk;
}
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;
int i;
if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
i = -EFAULT;
pt_error_return(regs, -i);
goto out_tsk;
}
copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
__get_user(child->thread.fsr, (&fps->fsr));
__get_user(child->thread.fpqdepth, (&fps->fpqd));
for(i = 0; i < 16; i++) {
__get_user(child->thread.fpqueue[i].insn_addr,
(&fps->fpq[i].insnaddr));
__get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
}
pt_succ_return(regs, 0);
goto out_tsk;
}
case PTRACE_READTEXT:
case PTRACE_READDATA: {
int res = ptrace_readdata(child, addr,
(void __user *) addr2, data);
if (res == data) {
pt_succ_return(regs, 0);
goto out_tsk;
}
/* Partial read is an IO failure */
if (res >= 0)
res = -EIO;
pt_error_return(regs, -res);
goto out_tsk;
}
case PTRACE_WRITETEXT:
case PTRACE_WRITEDATA: {
int res = ptrace_writedata(child, (void __user *) addr2,
addr, data);
if (res == data) {
pt_succ_return(regs, 0);
goto out_tsk;
}
/* Partial write is an IO failure */
if (res >= 0)
res = -EIO;
pt_error_return(regs, -res);
goto out_tsk;
}
case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
addr = 1;
case PTRACE_CONT: { /* restart after signal. */
if (!valid_signal(data)) {
pt_error_return(regs, EIO);
goto out_tsk;
}
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
wake_up_process(child);
pt_succ_return(regs, 0);
goto out_tsk;
}
/*
* make the child exit. Best I can do is send it a sigkill.
* perhaps it should be put in the status that it wants to
* exit.
*/
case PTRACE_KILL: {
if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
pt_succ_return(regs, 0);
goto out_tsk;
}
wake_up_process(child);
child->exit_code = SIGKILL;
pt_succ_return(regs, 0);
goto out_tsk;
}
default: {
int err = ptrace_request(child, request, addr, data);
if (err)
pt_error_return(regs, -err);
else
pt_succ_return(regs, 0);
goto out_tsk;
}
}
out_tsk:
if (child)
put_task_struct(child);
out:
unlock_kernel();
}
asmlinkage void syscall_trace(void)
{
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
return;
current->thread.flags ^= MAGIC_CONSTANT;
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;
}
}
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