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// conversions tapset
// Copyright (C) 2005-2017 Red Hat Inc.
// Copyright (C) 2007 Intel Corporation.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
/**
* sfunction kernel_string - Retrieves string from kernel memory
* @addr: The kernel address to retrieve the string from
*
* Description: This function returns the null terminated C string
* from a given kernel memory address. Reports an error on string
* copy fault.
*/
function kernel_string:string (addr:long) %{ /* pure */
__label__ deref_fault;
char *destination = STAP_RETVALUE;
kderef_string (destination, STAP_ARG_addr, MAXSTRINGLEN);
if (0) {
deref_fault: /* branched to from deref_string() */
/* Why '%1p' below? On newer kernels, the snprintf() function pads
* out '(null)' to the same width as other pointers, which looks
* really odd in the following error message. Setting a format
* width of '1' fixes this. */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel string copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_string - Retrieves string from kernel memory with alternative error string
* @addr: The kernel address to retrieve the string from
* @err_msg: The error message to return when data isn't available
*
* Description: This function returns the null terminated C string
* from a given kernel memory address. Reports the given error message
* on string copy fault.
*/
function kernel_string:string (addr:long, err_msg:string) {
try { return kernel_string(addr) } catch { return err_msg }
}
function kernel_string2:string (addr:long, err_msg:string) {
return kernel_string(addr, err_msg);
}
/**
* sfunction kernel_string_quoted - Retrieves and quotes string from kernel memory
*
* @addr: the kernel memory address to retrieve the string from
*
* Description: Returns the null terminated C string from a given kernel
* memory address where any ASCII characters that are not printable are
* replaced by the corresponding escape sequence in the returned string. Note
* that the string will be surrounded by double quotes. If the kernel memory
* data is not accessible at the given address, the address itself is returned
* as a string, without double quotes.
*/
function kernel_string_quoted:string (addr:long)
%{ /* pure */
int rc = 0;
if (STAP_ARG_addr != 0)
rc = _stp_text_str(STAP_RETVALUE,
(char *)(uintptr_t)STAP_ARG_addr,
MAXSTRINGLEN, MAXSTRINGLEN, 1, 0, 0);
if (STAP_ARG_addr == 0 || rc < 0)
snprintf(STAP_RETVALUE, MAXSTRINGLEN, "0x%lx",
(unsigned long)(uintptr_t)STAP_ARG_addr);
%}
/**
* sfunction kernel_string_n - Retrieves string of given length from kernel memory
* @addr: The kernel address to retrieve the string from
* @n: The maximum length of the string (if not null terminated)
*
* Description: Returns the C string of a maximum given length from a
* given kernel memory address. Reports an error on string copy fault.
*/
function kernel_string_n:string (addr:long, n:long) %{ /* pure */
__label__ deref_fault;
char *destination = STAP_RETVALUE;
int64_t len = clamp_t(int64_t, STAP_ARG_n + 1, 1, MAXSTRINGLEN);
kderef_string (destination, STAP_ARG_addr, len);
if (0) {
deref_fault: /* branched to from deref_string() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel string copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_string_utf32 - Retrieves UTF-32 string from kernel memory
* @addr: The kernel address to retrieve the string from
*
* Description: This function returns a null terminated UTF-8 string converted
* from the UTF-32 string at a given kernel memory address. Reports an error on
* string copy fault or conversion error.
*/
function kernel_string_utf32:string (addr:long) %{ /* pure */
__label__ deref_fault;
int rc = 0, len = MAXSTRINGLEN;
uint32_t c32, *source = (uint32_t*)(uintptr_t)STAP_ARG_addr;
char *destination = STAP_RETVALUE;
*destination = '\0';
while (len > 1 && (c32 = kread(source))) {
if ((rc = _stp_convert_utf32(destination, len, c32)) <= 0) {
if (rc < 0) {
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"invalid UTF-32 character U+%X at 0x%lx", c32,
(unsigned long) (uintptr_t) source);
CONTEXT->last_error = CONTEXT->error_buffer;
}
break;
}
++source;
destination += rc;
len -= rc;
}
if (0) {
deref_fault: /* branched to from deref_string() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel string copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) source);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_string_utf32 - Retrieves UTF-32 string from kernel memory with alternative error string
* @addr: The kernel address to retrieve the string from
* @err_msg: The error message to return when data isn't available
*
* Description: This function returns a null terminated UTF-8 string converted
* from the UTF-32 string at a given kernel memory address. Reports the given
* error message on string copy fault or conversion error.
*/
function kernel_string_utf32:string (addr:long, err_msg:string) {
try { return kernel_string_utf32(addr) } catch { return err_msg }
}
function kernel_string2_utf32:string (addr:long, err_msg:string) {
return kernel_string_utf32(addr, err_msg);
}
/**
* sfunction kernel_string_quoted_utf32 - Quote given UTF-32 kernel string.
* @addr: The kernel address to retrieve the string from
*
* Description: This function combines quoting as per @string_quoted
* and UTF-32 decoding as per @kernel_string_utf32.
*/
function kernel_string_quoted_utf32:string (addr:long) {
try { return string_quoted(kernel_string_utf32(addr)) } catch { return sprintf("0x%x", addr) }
}
/**
* sfunction kernel_string_utf16 - Retrieves UTF-16 string from kernel memory
* @addr: The kernel address to retrieve the string from
*
* Description: This function returns a null terminated UTF-8 string converted
* from the UTF-16 string at a given kernel memory address. Reports an error on
* string copy fault or conversion error.
*/
function kernel_string_utf16:string (addr:long) %{ /* pure */
__label__ deref_fault;
int rc = 0, len = MAXSTRINGLEN;
uint32_t c32;
uint16_t c16low, *source = (uint16_t*)(uintptr_t)STAP_ARG_addr;
char *destination = STAP_RETVALUE;
*destination = '\0';
while (len > 1 && (c32 = kread(source))) {
/* Check for a UTF-16 high surrogate, then its low pair, and combine them.
* Broken surrogates will just fall through to _stp_convert_utf32 and get
* flagged as an error there. (Or even allowed, if we decide to be lax.)
*/
if (c32 >= 0xD800 && c32 <= 0xDBFF) {
++source;
c16low = kread(source);
if (c16low >= 0xDC00 && c16low <= 0xDFFF)
c32 = 0x10000 + ((c32 & 0x3FF) << 10) + (c16low & 0x3FF);
else
--source;
}
if ((rc = _stp_convert_utf32(destination, len, c32)) <= 0) {
if (rc < 0) {
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"invalid UTF-16 character U+%X at 0x%lx", c32,
(unsigned long) (uintptr_t) source);
CONTEXT->last_error = CONTEXT->error_buffer;
}
break;
}
++source;
destination += rc;
len -= rc;
}
if (0) {
deref_fault: /* branched to from deref_string() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel string copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) source);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_string_utf16 - Retrieves UTF-16 string from kernel memory with alternative error string
* @addr: The kernel address to retrieve the string from
* @err_msg: The error message to return when data isn't available
*
* Description: This function returns a null terminated UTF-8 string converted
* from the UTF-16 string at a given kernel memory address. Reports the given
* error message on string copy fault or conversion error.
*/
function kernel_string_utf16:string (addr:long, err_msg:string) {
try { return kernel_string_utf16(addr) } catch { return err_msg }
}
function kernel_string2_utf16:string (addr:long, err_msg:string) {
return kernel_string_utf16(addr, err_msg);
}
/**
* sfunction kernel_string_quoted_utf16 - Quote given kernel UTF-16 string.
* @addr: The kernel address to retrieve the string from
*
* Description: This function combines quoting as per @string_quoted
* and UTF-16 decoding as per @kernel_string_utf16.
*/
function kernel_string_quoted_utf16:string (addr:long) {
try { return string_quoted(kernel_string_utf16(addr)) } catch { return sprintf("0x%x", addr) }
}
/**
* sfunction kernel_long - Retrieves a long value stored in kernel memory
* @addr: The kernel address to retrieve the long from
*
* Description: Returns the long value from a given kernel memory address.
* Reports an error when reading from the given address fails.
*/
function kernel_long:long (addr:long) %{ /* pure */
__label__ deref_fault;
STAP_RETVALUE = kread((long *) (uintptr_t) STAP_ARG_addr);
if (0) {
deref_fault: /* branched to from kread() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel long copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_int - Retrieves an int value stored in kernel memory
* @addr: The kernel address to retrieve the int from
*
* Description: Returns the int value from a given kernel memory address.
* Reports an error when reading from the given address fails.
*/
function kernel_int:long (addr:long) %{ /* pure */
__label__ deref_fault;
STAP_RETVALUE = kread((int *) (uintptr_t) STAP_ARG_addr);
if (0) {
deref_fault: /* branched to from kread() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel int copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_short - Retrieves a short value stored in kernel memory
* @addr: The kernel address to retrieve the short from
*
* Description: Returns the short value from a given kernel memory address.
* Reports an error when reading from the given address fails.
*/
function kernel_short:long (addr:long) %{ /* pure */
__label__ deref_fault;
STAP_RETVALUE = kread((short *) (uintptr_t) STAP_ARG_addr);
if (0) {
deref_fault: /* branched to from kread() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel short copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_char - Retrieves a char value stored in kernel memory
* @addr: The kernel address to retrieve the char from
*
* Description: Returns the char value from a given kernel memory address.
* Reports an error when reading from the given address fails.
*/
function kernel_char:long (addr:long) %{ /* pure */
__label__ deref_fault;
STAP_RETVALUE = kread((char *) (uintptr_t) STAP_ARG_addr);
if (0) {
deref_fault: /* branched to from kread() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel char copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_pointer - Retrieves a pointer value stored in kernel memory
* @addr: The kernel address to retrieve the pointer from
*
* Description: Returns the pointer value from a given kernel memory
* address. Reports an error when reading from the given address
* fails.
*/
function kernel_pointer:long (addr:long) %{ /* pure */
__label__ deref_fault;
STAP_RETVALUE = (uintptr_t) kread((void **) (uintptr_t) STAP_ARG_addr);
if (0) {
deref_fault: /* branched to from kread() */
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"kernel pointer copy fault at 0x%lx [man error::fault]",
(unsigned long) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
/**
* sfunction kernel_buffer_quoted - Retrieves and quotes buffer from kernel space
*
* @addr: the kernel space address to retrieve the buffer from
* @inlen: the exact length of the buffer to read
*
* Description: Reads inlen characters of a buffer from the given kernel space
* memory address, and returns up to MAXSTRINGLEN characters, where any ASCII
* characters that are not printable are replaced by the corresponding escape
* sequence in the returned string. Note that the string will be surrounded by
* double quotes. On the rare cases when kernel space data is not accessible at
* the given address, the address itself is returned as a string, without
* double quotes.
*/
function kernel_buffer_quoted:string (addr:long, inlen:long) {
return kernel_buffer_quoted(addr, inlen, %{ /* pure */ MAXSTRINGLEN%})
}
/**
* sfunction kernel_buffer_quoted - Retrieves and quotes buffer from kernel space
*
* @addr: the kernel space address to retrieve the buffer from
* @inlen: the exact length of the buffer to read
* @outlen: the maximum length of the output string
*
* Description: Reads inlen characters of a buffer from the given kernel space
* memory address, and returns up to outlen characters, where any ASCII
* characters that are not printable are replaced by the corresponding escape
* sequence in the returned string. Note that the string will be surrounded by
* double quotes. On the rare cases when kernel space data is not accessible at
* the given address, the address itself is returned as a string, without
* double quotes.
*/
function kernel_buffer_quoted:string (addr:long, inlen:long, outlen:long)
%{ /* pure */
size_t outlen = (size_t)clamp_t(int, STAP_ARG_outlen, 0, MAXSTRINGLEN);
if (outlen == 0)
return;
if ( _stp_text_str(STAP_RETVALUE, (char *)(uintptr_t)STAP_ARG_addr,
STAP_ARG_inlen, outlen, 1, 0, 1) < 0)
snprintf(STAP_RETVALUE, outlen, "0x%lx",
(unsigned long)(void *)(uintptr_t)STAP_ARG_addr);
%}
/**
* sfunction kernel_buffer_quoted_error - Retrieves and quotes buffer from kernel space
*
* @addr: the kernel space address to retrieve the buffer from
* @inlen: the exact length of the buffer to read
* @outlen: the maximum length of the output string
*
* Description: Reads inlen characters of a buffer from the given kernel space
* memory address, and returns up to outlen characters, where any ASCII
* characters that are not printable are replaced by the corresponding escape
* sequence in the returned string. Note that the string will be surrounded by
* double quotes. On the rare cases when kernel space data is not accessible at
* the given address, an error is thrown.
*/
function kernel_buffer_quoted_error:string (addr:long, inlen:long, outlen:long)
%{ /* pure */
size_t outlen = (size_t)clamp_t(int, STAP_ARG_outlen, 0, MAXSTRINGLEN);
if (outlen == 0
|| _stp_text_str(STAP_RETVALUE, (char *) (uintptr_t) STAP_ARG_addr,
STAP_ARG_inlen, outlen, 1, 0, 1) < 0)
STAP_ERROR("Unable to access kernel space data at 0x%lx",
(unsigned long)(void *)(uintptr_t)STAP_ARG_addr);
%}