cregit-Linux how code gets into the kernel

Release 4.10 scripts/mod/file2alias.c

Directory: scripts/mod
/* Simple code to turn various tables in an ELF file into alias definitions.
 * This deals with kernel datastructures where they should be
 * dealt with: in the kernel source.
 *
 * Copyright 2002-2003  Rusty Russell, IBM Corporation
 *           2003       Kai Germaschewski
 *
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include "modpost.h"
#include "devicetable-offsets.h"

/* We use the ELF typedefs for kernel_ulong_t but bite the bullet and
 * use either stdint.h or inttypes.h for the rest. */
#if KERNEL_ELFCLASS == ELFCLASS32

typedef Elf32_Addr	kernel_ulong_t;

#define BITS_PER_LONG 32
#else

typedef Elf64_Addr	kernel_ulong_t;

#define BITS_PER_LONG 64
#endif
#ifdef __sun__
#include <inttypes.h>
#else
#include <stdint.h>
#endif

#include <ctype.h>
#include <stdbool.h>


typedef uint32_t	__u32;

typedef uint16_t	__u16;

typedef unsigned char	__u8;
typedef struct {
	
__u8 b[16];
} 
uuid_le;

/* Big exception to the "don't include kernel headers into userspace, which
 * even potentially has different endianness and word sizes, since
 * we handle those differences explicitly below */
#include "../../include/linux/mod_devicetable.h"

/* This array collects all instances that use the generic do_table */

struct devtable {
	
const char *device_id; /* name of table, __mod_<name>__*_device_table. */
	
unsigned long id_size;
	
void *function;
};


#define ___cat(a,b) a ## b

#define __cat(a,b) ___cat(a,b)

/* we need some special handling for this host tool running eventually on
 * Darwin. The Mach-O section handling is a bit different than ELF section
 * handling. The differnces in detail are:
 *  a) we have segments which have sections
 *  b) we need a API call to get the respective section symbols */
#if defined(__MACH__)
#include <mach-o/getsect.h>


#define INIT_SECTION(name)  do {                                    \
                unsigned long name ## _len;                             \
                char *__cat(pstart_,name) = getsectdata("__TEXT",       \
                        #name, &__cat(name,_len));                      \
                char *__cat(pstop_,name) = __cat(pstart_,name) +        \
                        __cat(name, _len);                              \
                __cat(__start_,name) = (void *)__cat(pstart_,name);     \
                __cat(__stop_,name) = (void *)__cat(pstop_,name);       \
        } while (0)

#define SECTION(name)   __attribute__((section("__TEXT, " #name)))



struct devtable **__start___devtable, **__stop___devtable;
#else

#define INIT_SECTION(name) 
/* no-op for ELF */

#define SECTION(name)   __attribute__((section(#name)))

/* We construct a table of pointers in an ELF section (pointers generally
 * go unpadded by gcc).  ld creates boundary syms for us. */
extern struct devtable *__start___devtable[], *__stop___devtable[];
#endif /* __MACH__ */

#if !defined(__used)
# if __GNUC__ == 3 && __GNUC_MINOR__ < 3

#  define __used			__attribute__((__unused__))
# else

#  define __used			__attribute__((__used__))
# endif
#endif

/* Define a variable f that holds the value of field f of struct devid
 * based at address m.
 */

#define DEF_FIELD(m, devid, f) \
	typeof(((struct devid *)0)->f) f = TO_NATIVE(*(typeof(f) *)((m) + OFF_##devid##_##f))
/* Define a variable f that holds the address of field f of struct devid
 * based at address m.  Due to the way typeof works, for a field of type
 * T[N] the variable has type T(*)[N], _not_ T*.
 */

#define DEF_FIELD_ADDR(m, devid, f) \
	typeof(((struct devid *)0)->f) *f = ((m) + OFF_##devid##_##f)

/* Add a table entry.  We test function type matches while we're here. */

#define ADD_TO_DEVTABLE(device_id, type, function) \
	static struct devtable __cat(devtable,__LINE__) = {     \
                device_id + 0*sizeof((function)((const char *)NULL,     \
                                                (void *)NULL,           \
                                                (char *)NULL)),         \
                SIZE_##type, (function) };                              \
        static struct devtable *SECTION(__devtable) __used \
                __cat(devtable_ptr,__LINE__) = &__cat(devtable,__LINE__)


#define ADD(str, sep, cond, field)                              \
do {                                                            \
        strcat(str, sep);                                       \
        if (cond)                                               \
                sprintf(str + strlen(str),                      \
                        sizeof(field) == 1 ? "%02X" :           \
                        sizeof(field) == 2 ? "%04X" :           \
                        sizeof(field) == 4 ? "%08X" : "",       \
                        field);                                 \
        else                                                    \
                sprintf(str + strlen(str), "*");                \
} while(0)

/* End in a wildcard, for future extension */



static inline void add_wildcard(char *str)
{
	int len = strlen(str);

	if (str[len - 1] != '*')
		strcat(str + len, "*");
}


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static inline void add_uuid(char *str, uuid_le uuid)
{
	int len = strlen(str);

	sprintf(str + len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
		uuid.b[3], uuid.b[2], uuid.b[1], uuid.b[0],
		uuid.b[5], uuid.b[4], uuid.b[7], uuid.b[6],
		uuid.b[8], uuid.b[9], uuid.b[10], uuid.b[11],
		uuid.b[12], uuid.b[13], uuid.b[14], uuid.b[15]);
}


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greg kroah-hartmangreg kroah-hartman32.10%133.33%


Total143100.00%3100.00%



/**
 * Check that sizeof(device_id type) are consistent with size of section
 * in .o file. If in-consistent then userspace and kernel does not agree
 * on actual size which is a bug.
 * Also verify that the final entry in the table is all zeros.
 * Ignore both checks if build host differ from target host and size differs.
 **/



static void device_id_check(const char *modname, const char *device_id,
			    unsigned long size, unsigned long id_size,
			    void *symval)
{
	int i;

	if (size % id_size || size < id_size) {
		fatal("%s: sizeof(struct %s_device_id)=%lu is not a modulo "
		      "of the size of "
		      "section __mod_%s__<identifier>_device_table=%lu.\n"
		      "Fix definition of struct %s_device_id "
		      "in mod_devicetable.h\n",
		      modname, device_id, id_size, device_id, size, device_id);
	}
	/* Verify last one is a terminator */
	for (i = 0; i < id_size; i++ ) {
		if (*(uint8_t*)(symval+size-id_size+i)) {
			fprintf(stderr,"%s: struct %s_device_id is %lu bytes.  "
				"The last of %lu is:\n",
				modname, device_id, id_size, size / id_size);
			for (i = 0; i < id_size; i++ )
				fprintf(stderr,"0x%02x ",
					*(uint8_t*)(symval+size-id_size+i) );
			fprintf(stderr,"\n");
			fatal("%s: struct %s_device_id is not terminated "
				"with a NULL entry!\n", modname, device_id);
		}
	}
}


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/* USB is special because the bcdDevice can be matched against a numeric range */
/* Looks like "usb:vNpNdNdcNdscNdpNicNiscNipNinN" */



static void do_usb_entry(void *symval,
			 unsigned int bcdDevice_initial, int bcdDevice_initial_digits,
			 unsigned char range_lo, unsigned char range_hi,
			 unsigned char max, struct module *mod)
{
	char alias[500];
	DEF_FIELD(symval, usb_device_id, match_flags);
	DEF_FIELD(symval, usb_device_id, idVendor);
	DEF_FIELD(symval, usb_device_id, idProduct);
	DEF_FIELD(symval, usb_device_id, bcdDevice_lo);
	DEF_FIELD(symval, usb_device_id, bDeviceClass);
	DEF_FIELD(symval, usb_device_id, bDeviceSubClass);
	DEF_FIELD(symval, usb_device_id, bDeviceProtocol);
	DEF_FIELD(symval, usb_device_id, bInterfaceClass);
	DEF_FIELD(symval, usb_device_id, bInterfaceSubClass);
	DEF_FIELD(symval, usb_device_id, bInterfaceProtocol);
	DEF_FIELD(symval, usb_device_id, bInterfaceNumber);

	strcpy(alias, "usb:");
	ADD(alias, "v", match_flags&USB_DEVICE_ID_MATCH_VENDOR,
	    idVendor);
	ADD(alias, "p", match_flags&USB_DEVICE_ID_MATCH_PRODUCT,
	    idProduct);

	strcat(alias, "d");
	if (bcdDevice_initial_digits)
		sprintf(alias + strlen(alias), "%0*X",
			bcdDevice_initial_digits, bcdDevice_initial);
	if (range_lo == range_hi)
		sprintf(alias + strlen(alias), "%X", range_lo);
	else if (range_lo > 0 || range_hi < max) {
		if (range_lo > 0x9 || range_hi < 0xA)
			sprintf(alias + strlen(alias),
				"[%X-%X]",
				range_lo,
				range_hi);
		else {
			sprintf(alias + strlen(alias),
				range_lo < 0x9 ? "[%X-9" : "[%X",
				range_lo);
			sprintf(alias + strlen(alias),
				range_hi > 0xA ? "A-%X]" : "%X]",
				range_hi);
		}
	}
	if (bcdDevice_initial_digits < (sizeof(bcdDevice_lo) * 2 - 1))
		strcat(alias, "*");

	ADD(alias, "dc", match_flags&USB_DEVICE_ID_MATCH_DEV_CLASS,
	    bDeviceClass);
	ADD(alias, "dsc", match_flags&USB_DEVICE_ID_MATCH_DEV_SUBCLASS,
	    bDeviceSubClass);
	ADD(alias, "dp", match_flags&USB_DEVICE_ID_MATCH_DEV_PROTOCOL,
	    bDeviceProtocol);
	ADD(alias, "ic", match_flags&USB_DEVICE_ID_MATCH_INT_CLASS,
	    bInterfaceClass);
	ADD(alias, "isc", match_flags&USB_DEVICE_ID_MATCH_INT_SUBCLASS,
	    bInterfaceSubClass);
	ADD(alias, "ip", match_flags&USB_DEVICE_ID_MATCH_INT_PROTOCOL,
	    bInterfaceProtocol);
	ADD(alias, "in", match_flags&USB_DEVICE_ID_MATCH_INT_NUMBER,
	    bInterfaceNumber);

	add_wildcard(alias);
	buf_printf(&mod->dev_table_buf,
		   "MODULE_ALIAS(\"%s\");\n", alias);
}


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nathaniel mccallumnathaniel mccallum6013.92%114.29%


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jean delvarejean delvare10.23%114.29%


Total431100.00%7100.00%



/* Handles increment/decrement of BCD formatted integers */
/* Returns the previous value, so it works like i++ or i-- */



static unsigned int incbcd(unsigned int *bcd,
			   int inc,
			   unsigned char max,
			   size_t chars)
{
	unsigned int init = *bcd, i, j;
	unsigned long long c, dec = 0;

	/* If bcd is not in BCD format, just increment */
	if (max > 0x9) {
		*bcd += inc;
		return init;
	}

	/* Convert BCD to Decimal */
	for (i=0 ; i < chars ; i++) {
		c = (*bcd >> (i << 2)) & 0xf;
		c = c > 9 ? 9 : c; /* force to bcd just in case */
		for (j=0 ; j < i ; j++)
			c = c * 10;
		dec += c;
	}

	/* Do our increment/decrement */
	dec += inc;
	*bcd  = 0;

	/* Convert back to BCD */
	for (i=0 ; i < chars ; i++) {
		for (c=1,j=0 ; j < i ; j++)
			c = c * 10;
		c = (dec / c) % 10;
		*bcd += c << (i << 2);
	}
	return init;
}


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static void do_usb_entry_multi(void *symval, struct module *mod)
{
	unsigned int devlo, devhi;
	unsigned char chi, clo, max;
	int ndigits;

	DEF_FIELD(symval, usb_device_id, match_flags);
	DEF_FIELD(symval, usb_device_id, idVendor);
	DEF_FIELD(symval, usb_device_id, idProduct);
	DEF_FIELD(symval, usb_device_id, bcdDevice_lo);
	DEF_FIELD(symval, usb_device_id, bcdDevice_hi);
	DEF_FIELD(symval, usb_device_id, bDeviceClass);
	DEF_FIELD(symval, usb_device_id, bInterfaceClass);

	devlo = match_flags & USB_DEVICE_ID_MATCH_DEV_LO ?
		bcdDevice_lo : 0x0U;
	devhi = match_flags & USB_DEVICE_ID_MATCH_DEV_HI ?
		bcdDevice_hi : ~0x0U;

	/* Figure out if this entry is in bcd or hex format */
	max = 0x9; /* Default to decimal format */
	for (ndigits = 0 ; ndigits < sizeof(bcdDevice_lo) * 2 ; ndigits++) {
		clo = (devlo >> (ndigits << 2)) & 0xf;
		chi = ((devhi > 0x9999 ? 0x9999 : devhi) >> (ndigits << 2)) & 0xf;
		if (clo > max || chi > max) {
			max = 0xf;
			break;
		}
	}

	/*
         * Some modules (visor) have empty slots as placeholder for
         * run-time specification that results in catch-all alias
         */
	if (!(idVendor | idProduct | bDeviceClass | bInterfaceClass))
		return;

	/* Convert numeric bcdDevice range into fnmatch-able pattern(s) */
	for (ndigits = sizeof(bcdDevice_lo) * 2 - 1; devlo <= devhi; ndigits--) {
		clo = devlo & 0xf;
		chi = devhi & 0xf;
		if (chi > max)	/* If we are in bcd mode, truncate if necessary */
			chi = max;
		devlo >>= 4;
		devhi >>= 4;

		if (devlo == devhi || !ndigits) {
			do_usb_entry(symval, devlo, ndigits, clo, chi, max, mod);
			break;
		}

		if (clo > 0x0)
			do_usb_entry(symval,
				     incbcd(&devlo, 1, max,
					    sizeof(bcdDevice_lo) * 2),
				     ndigits, clo, max, max, mod);

		if (chi < max)
			do_usb_entry(symval,
				     incbcd(&devhi, -1, max,
					    sizeof(bcdDevice_lo) * 2),
				     ndigits, 0x0, chi, max, mod);
	}
}


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greg kroah-hartmangreg kroah-hartman20.54%120.00%


Total370100.00%5100.00%






static void do_usb_table(void *symval, unsigned long size,
			 struct module *mod)
{
	unsigned int i;
	const unsigned long id_size = SIZE_usb_device_id;

	device_id_check(mod->name, "usb", size, id_size, symval);

	/* Leave last one: it's the terminator. */
	size -= id_size;

	for (i = 0; i < size; i += id_size)
		do_usb_entry_multi(symval + i, mod);
}


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rusty russellrusty russell11.37%120.00%


Total73100.00%5100.00%






static void do_of_entry_multi(void *symval, struct module *mod)
{
	char alias[500];
	int len;
	char *tmp;

	DEF_FIELD_ADDR(symval, of_device_id, name);
	DEF_FIELD_ADDR(symval, of_device_id, type);
	DEF_FIELD_ADDR(symval, of_device_id, compatible);

	len = sprintf(alias, "of:N%sT%s", (*name)[0] ? *name : "*",
		      (*type)[0] ? *type : "*");

	if ((*compatible)[0])
		sprintf(&alias[len], "%sC%s", (*type)[0] ? "*" : "",
			*compatible);

	/* Replace all whitespace with underscores */
	for (tmp = alias; tmp && *tmp; tmp++)
		if (isspace(*tmp))
			*tmp = '_';

	buf_printf(&mod->dev_table_buf, "MODULE_ALIAS(\"%s\");\n", alias);
	strcat(alias, "C");
	add_wildcard(alias);
	buf_printf(&mod->dev_table_buf, "MODULE_ALIAS(\"%s\");\n", alias);
}


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static void do_of_table(void *symval, unsigned long size,
			struct module *mod)
{
	unsigned int i;
	const unsigned long id_size = SIZE_of_device_id;

	device_id_check(mod->name, "of", size, id_size, symval);

	/* Leave last one: it's the terminator. */
	size -= id_size;

	for (i = 0; i < size; i += id_size)
		do_of_entry_multi(symval + i, mod);
}


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/* Looks like: hid:bNvNpN */



static int do_hid_entry(const char *filename,
			     void *symval, char *alias)
{
	DEF_FIELD(symval, hid_device_id, bus);
	DEF_FIELD(symval, hid_device_id, group);
	DEF_FIELD(symval, hid_device_id, vendor);
	DEF_FIELD(symval, hid_device_id, product);

	sprintf(alias, "hid:");
	ADD(alias, "b", bus != HID_BUS_ANY, bus);
	ADD(alias, "g", group != HID_GROUP_ANY, group);
	ADD(alias, "v", vendor != HID_ANY_ID, vendor);
	ADD(alias, "p", product != HID_ANY_ID, product);

	return 1;
}

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Total117100.00%5100.00%



ADD_TO_DEVTABLE("hid", hid_device_id, do_hid_entry);

/* Looks like: ieee1394:venNmoNspNverN */



static int do_ieee1394_entry(const char *filename,
			     void *symval, char *alias)
{
	DEF_FIELD(symval, ieee1394_device_id, match_flags);
	DEF_FIELD(symval, ieee1394_device_id, vendor_id);
	DEF_FIELD(symval, ieee1394_device_id, model_id);
	DEF_FIELD(symval, ieee1394_device_id, specifier_id);
	DEF_FIELD(symval, ieee1394_device_id, version);

	strcpy(alias, "ieee1394:");
	ADD(alias, "ven", match_flags & IEEE1394_MATCH_VENDOR_ID,
	    vendor_id);
	ADD(alias, "mo", match_flags & IEEE1394_MATCH_MODEL_ID,
	    model_id);
	ADD(alias, "sp", match_flags & IEEE1394_MATCH_SPECIFIER_ID,
	    specifier_id);
	ADD(alias, "ver", match_flags & IEEE1394_MATCH_VERSION,
	    version);

	add_wildcard(alias);
	return 1;
}

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ADD_TO_DEVTABLE("ieee1394", ieee1394_device_id, do_ieee1394_entry);

/* Looks like: pci:vNdNsvNsdNbcNscNiN. */



static int do_pci_entry(const char *filename,
			void *symval, char *alias)
{
	/* Class field can be divided into these three. */
	unsigned char baseclass, subclass, interface,
		baseclass_mask, subclass_mask, interface_mask;

	DEF_FIELD(symval, pci_device_id, vendor);
	DEF_FIELD(symval, pci_device_id, device);
	DEF_FIELD(symval, pci_device_id, subvendor);
	DEF_FIELD(symval, pci_device_id, subdevice);
	DEF_FIELD(symval, pci_device_id, class);
	DEF_FIELD(symval, pci_device_id, class_mask);

	strcpy(alias, "pci:");
	ADD(alias, "v", vendor != PCI_ANY_ID, vendor);
	ADD(alias, "d", device != PCI_ANY_ID, device);
	ADD(alias, "sv", subvendor != PCI_ANY_ID, subvendor);
	ADD(alias, "sd", subdevice != PCI_ANY_ID, subdevice);

	baseclass = (class) >> 16;
	baseclass_mask = (class_mask) >> 16;
	subclass = (class) >> 8;
	subclass_mask = (class_mask) >> 8;
	interface = class;
	interface_mask = class_mask;

	if ((baseclass_mask != 0 && baseclass_mask != 0xFF)
	    || (subclass_mask != 0 && subclass_mask != 0xFF)
	    || (interface_mask != 0 && interface_mask != 0xFF)) {
		warn("Can't handle masks in %s:%04X\n",
		     filename, class_mask);
		return 0;
	}

	ADD(alias, "bc", baseclass_mask == 0xFF, baseclass);
	ADD(alias, "sc", subclass_mask == 0xFF, subclass);
	ADD(alias, "i", interface_mask == 0xFF, interface);
	add_wildcard(alias);
	return 1;
}

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sam ravnborgsam ravnborg20.71%120.00%


Total280100.00%5100.00%



ADD_TO_DEVTABLE("pci", pci_device_id, do_pci_entry);

/* looks like: "ccw:tNmNdtNdmN" */



static int do_ccw_entry(const char *filename,
			void *symval, char *alias)
{
	DEF_FIELD(symval, ccw_device_id, match_flags);
	DEF_FIELD(symval, ccw_device_id, cu_type);
	DEF_FIELD(symval, ccw_device_id, cu_model);
	DEF_FIELD(symval, ccw_device_id, dev_type);
	DEF_FIELD(symval, ccw_device_id, dev_model);

	strcpy(alias, "ccw:");
	ADD(alias, "t", match_flags&CCW_DEVICE_ID_MATCH_CU_TYPE,
	    cu_type);
	ADD(alias, "m", match_flags&CCW_DEVICE_ID_MATCH_CU_MODEL,
	    cu_model);
	ADD(alias, "dt", match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE,
	    dev_type);
	ADD(alias, "dm", match_flags&CCW_DEVICE_ID_MATCH_DEVICE_MODEL,
	    dev_model);
	add_wildcard(alias);
	return 1;
}

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bastian blankbastian blank10.76%125.00%


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ADD_TO_DEVTABLE("ccw", ccw_device_id, do_ccw_entry);

/* looks like: "ap:tN" */



static int do_ap_entry(const char *filename,
		       void *symval, char *alias)
{
	DEF_FIELD(symval, ap_device_id, dev_type);

	sprintf(alias, "ap:t%02X*", dev_type);
	return 1;
}

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jean delvarejean delvare12.50%133.33%


Total40100.00%3100.00%



ADD_TO_DEVTABLE("ap", ap_device_id, do_ap_entry);

/* looks like: "css:tN" */



static int do_css_entry(const char *filename,
			void *symval, char *alias)
{
	DEF_FIELD(symval, css_device_id, type);

	sprintf(alias, "css:t%01X", type);
	return 1;
}

Contributors
PersonTokensPropCommitsCommitProp
cornelia huckcornelia huck2972.50%150.00%


andreas schwabandreas schwab1127.50%150.00%


Total40100.00%2100.00%



ADD_TO_DEVTABLE("css", css_device_id, do_css_entry);

/* Looks like: "serio:tyNprNidNexN" */



static int do_serio_entry(const char *filename,
			  void *symval, char *alias)
{
	DEF_FIELD(symval, serio_device_id, type);
	DEF_FIELD(symval, serio_device_id, proto);
	DEF_FIELD(symval, serio_device_id, id);
	DEF_FIELD(symval, serio_device_id, extra);

	strcpy(alias, "serio:")