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linux/arch/sparc/kernel/ptrace_64.c

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/* ptrace.c: Sparc process tracing support.
*
* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*
* 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/sched/task_stack.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/smp.h>
#include <linux/security.h>
#include <linux/seccomp.h>
#include <linux/audit.h>
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <trace/syscall.h>
#include <linux/compat.h>
#include <linux/elf.h>
#include <linux/context_tracking.h>
#include <asm/asi.h>
#include <asm/pgtable.h>
#include <linux/uaccess.h>
#include <asm/psrcompat.h>
#include <asm/visasm.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/cpudata.h>
#include <asm/cacheflush.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
#include "entry.h"
/* #define ALLOW_INIT_TRACING */
struct pt_regs_offset {
const char *name;
int offset;
};
#define REG_OFFSET_NAME(n, r) \
{.name = n, .offset = (PT_V9_##r)}
#define REG_OFFSET_END {.name = NULL, .offset = 0}
static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME("g0", G0),
REG_OFFSET_NAME("g1", G1),
REG_OFFSET_NAME("g2", G2),
REG_OFFSET_NAME("g3", G3),
REG_OFFSET_NAME("g4", G4),
REG_OFFSET_NAME("g5", G5),
REG_OFFSET_NAME("g6", G6),
REG_OFFSET_NAME("g7", G7),
REG_OFFSET_NAME("i0", I0),
REG_OFFSET_NAME("i1", I1),
REG_OFFSET_NAME("i2", I2),
REG_OFFSET_NAME("i3", I3),
REG_OFFSET_NAME("i4", I4),
REG_OFFSET_NAME("i5", I5),
REG_OFFSET_NAME("i6", I6),
REG_OFFSET_NAME("i7", I7),
REG_OFFSET_NAME("tstate", TSTATE),
REG_OFFSET_NAME("pc", TPC),
REG_OFFSET_NAME("npc", TNPC),
REG_OFFSET_NAME("y", Y),
REG_OFFSET_NAME("lr", I7),
REG_OFFSET_END,
};
/*
* 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 */
}
/* To get the necessary page struct, access_process_vm() first calls
* get_user_pages(). This has done a flush_dcache_page() on the
* accessed page. Then our caller (copy_{to,from}_user_page()) did
* to memcpy to read/write the data from that page.
*
* Now, the only thing we have to do is:
* 1) flush the D-cache if it's possible than an illegal alias
* has been created
* 2) flush the I-cache if this is pre-cheetah and we did a write
*/
void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
unsigned long uaddr, void *kaddr,
unsigned long len, int write)
{
BUG_ON(len > PAGE_SIZE);
if (tlb_type == hypervisor)
return;
preempt_disable();
#ifdef DCACHE_ALIASING_POSSIBLE
/* If bit 13 of the kernel address we used to access the
* user page is the same as the virtual address that page
* is mapped to in the user's address space, we can skip the
* D-cache flush.
*/
if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
unsigned long start = __pa(kaddr);
unsigned long end = start + len;
unsigned long dcache_line_size;
dcache_line_size = local_cpu_data().dcache_line_size;
if (tlb_type == spitfire) {
for (; start < end; start += dcache_line_size)
spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
} else {
start &= ~(dcache_line_size - 1);
for (; start < end; start += dcache_line_size)
__asm__ __volatile__(
"stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (start),
"i" (ASI_DCACHE_INVALIDATE));
}
}
#endif
if (write && tlb_type == spitfire) {
unsigned long start = (unsigned long) kaddr;
unsigned long end = start + len;
unsigned long icache_line_size;
icache_line_size = local_cpu_data().icache_line_size;
for (; start < end; start += icache_line_size)
flushi(start);
}
preempt_enable();
}
EXPORT_SYMBOL_GPL(flush_ptrace_access);
static int get_from_target(struct task_struct *target, unsigned long uaddr,
void *kbuf, int len)
{
if (target == current) {
if (copy_from_user(kbuf, (void __user *) uaddr, len))
return -EFAULT;
} else {
int len2 = access_process_vm(target, uaddr, kbuf, len,
FOLL_FORCE);
if (len2 != len)
return -EFAULT;
}
return 0;
}
static int set_to_target(struct task_struct *target, unsigned long uaddr,
void *kbuf, int len)
{
if (target == current) {
if (copy_to_user((void __user *) uaddr, kbuf, len))
return -EFAULT;
} else {
int len2 = access_process_vm(target, uaddr, kbuf, len,
FOLL_FORCE | FOLL_WRITE);
if (len2 != len)
return -EFAULT;
}
return 0;
}
static int regwindow64_get(struct task_struct *target,
const struct pt_regs *regs,
struct reg_window *wbuf)
{
unsigned long rw_addr = regs->u_regs[UREG_I6];
if (!test_thread_64bit_stack(rw_addr)) {
struct reg_window32 win32;
int i;
if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
return -EFAULT;
for (i = 0; i < 8; i++)
wbuf->locals[i] = win32.locals[i];
for (i = 0; i < 8; i++)
wbuf->ins[i] = win32.ins[i];
} else {
rw_addr += STACK_BIAS;
if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
return -EFAULT;
}
return 0;
}
static int regwindow64_set(struct task_struct *target,
const struct pt_regs *regs,
struct reg_window *wbuf)
{
unsigned long rw_addr = regs->u_regs[UREG_I6];
if (!test_thread_64bit_stack(rw_addr)) {
struct reg_window32 win32;
int i;
for (i = 0; i < 8; i++)
win32.locals[i] = wbuf->locals[i];
for (i = 0; i < 8; i++)
win32.ins[i] = wbuf->ins[i];
if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
return -EFAULT;
} else {
rw_addr += STACK_BIAS;
if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
return -EFAULT;
}
return 0;
}
enum sparc_regset {
REGSET_GENERAL,
REGSET_FP,
};
static int genregs64_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 = task_pt_regs(target);
int ret;
if (target == current)
flushw_user();
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->u_regs,
0, 16 * sizeof(u64));
if (!ret && count && pos < (32 * sizeof(u64))) {
struct reg_window window;
if (regwindow64_get(target, regs, &window))
return -EFAULT;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&window,
16 * sizeof(u64),
32 * sizeof(u64));
}
if (!ret) {
/* TSTATE, TPC, TNPC */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&regs->tstate,
32 * sizeof(u64),
35 * sizeof(u64));
}
if (!ret) {
unsigned long y = regs->y;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&y,
35 * sizeof(u64),
36 * sizeof(u64));
}
if (!ret) {
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
36 * sizeof(u64), -1);
}
return ret;
}
static int genregs64_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 = task_pt_regs(target);
int ret;
if (target == current)
flushw_user();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->u_regs,
0, 16 * sizeof(u64));
if (!ret && count && pos < (32 * sizeof(u64))) {
struct reg_window window;
if (regwindow64_get(target, regs, &window))
return -EFAULT;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&window,
16 * sizeof(u64),
32 * sizeof(u64));
if (!ret &&
regwindow64_set(target, regs, &window))
return -EFAULT;
}
if (!ret && count > 0) {
unsigned long tstate;
/* TSTATE */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&tstate,
32 * sizeof(u64),
33 * sizeof(u64));
if (!ret) {
/* Only the condition codes and the "in syscall"
* state can be modified in the %tstate register.
*/
tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
regs->tstate |= tstate;
}
}
if (!ret) {
/* TPC, TNPC */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->tpc,
33 * sizeof(u64),
35 * sizeof(u64));
}
if (!ret) {
unsigned long y;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&y,
35 * sizeof(u64),
36 * sizeof(u64));
if (!ret)
regs->y = y;
}
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
36 * sizeof(u64), -1);
return ret;
}
static int fpregs64_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 = task_thread_info(target)->fpregs;
unsigned long fprs, fsr, gsr;
int ret;
if (target == current)
save_and_clear_fpu();
fprs = task_thread_info(target)->fpsaved[0];
if (fprs & FPRS_DL)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
fpregs,
0, 16 * sizeof(u64));
else
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
0,
16 * sizeof(u64));
if (!ret) {
if (fprs & FPRS_DU)
ret = user_regset_copyout(&pos, &count,
&kbuf, &ubuf,
fpregs + 16,
16 * sizeof(u64),
32 * sizeof(u64));
else
ret = user_regset_copyout_zero(&pos, &count,
&kbuf, &ubuf,
16 * sizeof(u64),
32 * sizeof(u64));
}
if (fprs & FPRS_FEF) {
fsr = task_thread_info(target)->xfsr[0];
gsr = task_thread_info(target)->gsr[0];
} else {
fsr = gsr = 0;
}
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&fsr,
32 * sizeof(u64),
33 * sizeof(u64));
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&gsr,
33 * sizeof(u64),
34 * sizeof(u64));
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&fprs,
34 * sizeof(u64),
35 * sizeof(u64));
if (!ret)
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
35 * sizeof(u64), -1);
return ret;
}
static int fpregs64_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 = task_thread_info(target)->fpregs;
unsigned long fprs;
int ret;
if (target == current)
save_and_clear_fpu();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs,
0, 32 * sizeof(u64));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
task_thread_info(target)->xfsr,
32 * sizeof(u64),
33 * sizeof(u64));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
task_thread_info(target)->gsr,
33 * sizeof(u64),
34 * sizeof(u64));
fprs = task_thread_info(target)->fpsaved[0];
if (!ret && count > 0) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fprs,
34 * sizeof(u64),
35 * sizeof(u64));
}
fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
task_thread_info(target)->fpsaved[0] = fprs;
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
35 * sizeof(u64), -1);
return ret;
}
static const struct user_regset sparc64_regsets[] = {
/* Format is:
* G0 --> G7
* O0 --> O7
* L0 --> L7
* I0 --> I7
* TSTATE, TPC, TNPC, Y
*/
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = 36,
.size = sizeof(u64), .align = sizeof(u64),
.get = genregs64_get, .set = genregs64_set
},
/* Format is:
* F0 --> F63
* FSR
* GSR
* FPRS
*/
[REGSET_FP] = {
.core_note_type = NT_PRFPREG,
.n = 35,
.size = sizeof(u64), .align = sizeof(u64),
.get = fpregs64_get, .set = fpregs64_set
},
};
static const struct user_regset_view user_sparc64_view = {
.name = "sparc64", .e_machine = EM_SPARCV9,
.regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
};
#ifdef CONFIG_COMPAT
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 = task_pt_regs(target);
compat_ulong_t __user *reg_window;
compat_ulong_t *k = kbuf;
compat_ulong_t __user *u = ubuf;
compat_ulong_t reg;
if (target == current)
flushw_user();
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf) {
for (; count > 0 && pos < 16; count--)
*k++ = regs->u_regs[pos++];
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
reg_window -= 16;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(*k++, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
k, sizeof(*k),
FOLL_FORCE)
!= sizeof(*k))
return -EFAULT;
k++;
pos++;
}
}
} else {
for (; count > 0 && pos < 16; count--) {
if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
return -EFAULT;
}
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
reg_window -= 16;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, &reg_window[pos++]) ||
put_user(reg, u++))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
&reg, sizeof(reg),
FOLL_FORCE)
!= sizeof(reg))
return -EFAULT;
if (access_process_vm(target,
(unsigned long) u,
&reg, sizeof(reg),
FOLL_FORCE | FOLL_WRITE)
!= sizeof(reg))
return -EFAULT;
pos++;
u++;
}
}
}
while (count > 0) {
switch (pos) {
case 32: /* PSR */
reg = tstate_to_psr(regs->tstate);
break;
case 33: /* PC */
reg = regs->tpc;
break;
case 34: /* NPC */
reg = regs->tnpc;
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 = task_pt_regs(target);
compat_ulong_t __user *reg_window;
const compat_ulong_t *k = kbuf;
const compat_ulong_t __user *u = ubuf;
compat_ulong_t reg;
if (target == current)
flushw_user();
pos /= sizeof(reg);
count /= sizeof(reg);
if (kbuf) {
for (; count > 0 && pos < 16; count--)
regs->u_regs[pos++] = *k++;
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
reg_window -= 16;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (put_user(*k++, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
(void *) k,
sizeof(*k),
FOLL_FORCE | FOLL_WRITE)
!= sizeof(*k))
return -EFAULT;
k++;
pos++;
}
}
} else {
for (; count > 0 && pos < 16; count--) {
if (get_user(reg, u++))
return -EFAULT;
regs->u_regs[pos++] = reg;
}
reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
reg_window -= 16;
if (target == current) {
for (; count > 0 && pos < 32; count--) {
if (get_user(reg, u++) ||
put_user(reg, &reg_window[pos++]))
return -EFAULT;
}
} else {
for (; count > 0 && pos < 32; count--) {
if (access_process_vm(target,
(unsigned long)
u,
&reg, sizeof(reg),
FOLL_FORCE)
!= sizeof(reg))
return -EFAULT;
if (access_process_vm(target,
(unsigned long)
&reg_window[pos],
&reg, sizeof(reg),
FOLL_FORCE | FOLL_WRITE)
!= sizeof(reg))
return -EFAULT;
pos++;
u++;
}
}
}
while (count > 0) {
unsigned long tstate;
if (kbuf)
reg = *k++;
else if (get_user(reg, u++))
return -EFAULT;
switch (pos) {
case 32: /* PSR */
tstate = regs->tstate;
tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
tstate |= psr_to_tstate_icc(reg);
if (reg & PSR_SYSCALL)
tstate |= TSTATE_SYSCALL;
regs->tstate = tstate;
break;
case 33: /* PC */
regs->tpc = reg;
break;
case 34: /* NPC */
regs->tnpc = 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 = task_thread_info(target)->fpregs;
compat_ulong_t enabled;
unsigned long fprs;
compat_ulong_t fsr;
int ret = 0;
if (target == current)
save_and_clear_fpu();
fprs = task_thread_info(target)->fpsaved[0];
if (fprs & FPRS_FEF) {
fsr = task_thread_info(target)->xfsr[0];
enabled = 1;
} else {
fsr = 0;
enabled = 0;
}
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,
&fsr,
33 * sizeof(u32),
34 * sizeof(u32));
if (!ret) {
compat_ulong_t val;
val = (enabled << 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 = task_thread_info(target)->fpregs;
unsigned long fprs;
int ret;
if (target == current)
save_and_clear_fpu();
fprs = task_thread_info(target)->fpsaved[0];
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) {
compat_ulong_t fsr;
unsigned long val;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fsr,
33 * sizeof(u32),
34 * sizeof(u32));
if (!ret) {
val = task_thread_info(target)->xfsr[0];
val &= 0xffffffff00000000UL;
val |= fsr;
task_thread_info(target)->xfsr[0] = val;
}
}
fprs |= (FPRS_FEF | FPRS_DL);
task_thread_info(target)->fpsaved[0] = fprs;
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,
.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,
.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)
};
#endif /* CONFIG_COMPAT */
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
#ifdef CONFIG_COMPAT
if (test_tsk_thread_flag(task, TIF_32BIT))
return &user_sparc32_view;
#endif
return &user_sparc64_view;
}
#ifdef CONFIG_COMPAT
struct compat_fps {
unsigned int regs[32];
unsigned int fsr;
unsigned int flags;
unsigned int extra;
unsigned int fpqd;
struct compat_fq {
unsigned int insnaddr;
unsigned int insn;
} fpq[16];
};
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
const struct user_regset_view *view = task_user_regset_view(current);
compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
struct pt_regs32 __user *pregs;
struct compat_fps __user *fps;
unsigned long addr2 = caddr2;
unsigned long addr = caddr;
unsigned long data = cdata;
int ret;
pregs = (struct pt_regs32 __user *) addr;
fps = (struct compat_fps __user *) addr;
switch (request) {
case PTRACE_PEEKUSR:
ret = (addr != 0) ? -EIO : 0;
break;
case PTRACE_GETREGS:
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
32 * sizeof(u32),
4 * sizeof(u32),
&pregs->psr);
if (!ret)
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1 * sizeof(u32),
15 * sizeof(u32),
&pregs->u_regs[0]);
break;
case PTRACE_SETREGS:
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
32 * sizeof(u32),
4 * sizeof(u32),
&pregs->psr);
if (!ret)
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1 * sizeof(u32),
15 * sizeof(u32),
&pregs->u_regs[0]);
break;
case PTRACE_GETFPREGS:
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->flags) ||
__put_user(0, &fps->extra) ||
__put_user(0, &fps->fpqd) ||
clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
ret = -EFAULT;
}
break;
case PTRACE_SETFPREGS:
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,
(char __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, (char __user *) addr2,
addr, data);
if (ret == data)
ret = 0;
else if (ret >= 0)
ret = -EIO;
break;
default:
if (request == PTRACE_SPARC_DETACH)
request = PTRACE_DETACH;
ret = compat_ptrace_request(child, request, addr, data);
break;
}
return ret;
}
#endif /* CONFIG_COMPAT */
struct fps {
unsigned int regs[64];
unsigned long fsr;
};
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
const struct user_regset_view *view = task_user_regset_view(current);
unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
struct pt_regs __user *pregs;
struct fps __user *fps;
void __user *addr2p;
int ret;
pregs = (struct pt_regs __user *) addr;
fps = (struct fps __user *) addr;
addr2p = (void __user *) addr2;
switch (request) {
case PTRACE_PEEKUSR:
ret = (addr != 0) ? -EIO : 0;
break;
case PTRACE_GETREGS64:
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1 * sizeof(u64),
15 * sizeof(u64),
&pregs->u_regs[0]);
if (!ret) {
/* XXX doesn't handle 'y' register correctly XXX */
ret = copy_regset_to_user(child, view, REGSET_GENERAL,
32 * sizeof(u64),
4 * sizeof(u64),
&pregs->tstate);
}
break;
case PTRACE_SETREGS64:
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1 * sizeof(u64),
15 * sizeof(u64),
&pregs->u_regs[0]);
if (!ret) {
/* XXX doesn't handle 'y' register correctly XXX */
ret = copy_regset_from_user(child, view, REGSET_GENERAL,
32 * sizeof(u64),
4 * sizeof(u64),
&pregs->tstate);
}
break;
case PTRACE_GETFPREGS64:
ret = copy_regset_to_user(child, view, REGSET_FP,
0 * sizeof(u64),
33 * sizeof(u64),
fps);
break;
case PTRACE_SETFPREGS64:
ret = copy_regset_from_user(child, view, REGSET_FP,
0 * sizeof(u64),
33 * sizeof(u64),
fps);
break;
case PTRACE_READTEXT:
case PTRACE_READDATA:
ret = ptrace_readdata(child, addr, addr2p, data);
if (ret == data)
ret = 0;
else if (ret >= 0)
ret = -EIO;
break;
case PTRACE_WRITETEXT:
case PTRACE_WRITEDATA:
ret = ptrace_writedata(child, addr2p, addr, data);
if (ret == data)
ret = 0;
else if (ret >= 0)
ret = -EIO;
break;
default:
if (request == PTRACE_SPARC_DETACH)
request = PTRACE_DETACH;
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
int ret = 0;
/* do the secure computing check first */
secure_computing_strict(regs->u_regs[UREG_G1]);
if (test_thread_flag(TIF_NOHZ))
user_exit();
if (test_thread_flag(TIF_SYSCALL_TRACE))
ret = tracehook_report_syscall_entry(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->u_regs[UREG_G1]);
audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
regs->u_regs[UREG_I3]);
return ret;
}
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
if (test_thread_flag(TIF_NOHZ))
user_exit();
audit_syscall_exit(regs);
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_exit(regs, regs->u_regs[UREG_I0]);
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
if (test_thread_flag(TIF_NOHZ))
user_enter();
}
/**
* regs_query_register_offset() - query register offset from its name
* @name: the name of a register
*
* regs_query_register_offset() returns the offset of a register in struct
* pt_regs from its name. If the name is invalid, this returns -EINVAL;
*/
int regs_query_register_offset(const char *name)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (!strcmp(roff->name, name))
return roff->offset;
return -EINVAL;
}
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