Commit 93281c4a authored by Borislav Petkov's avatar Borislav Petkov
Browse files

x86/insn: Add an insn_decode() API 



Users of the instruction decoder should use this to decode instruction
bytes. For that, have insn*() helpers return an int value to denote
success/failure. When there's an error fetching the next insn byte and
the insn falls short, return -ENODATA to denote that.

While at it, make insn_get_opcode() more stricter as to whether what has
seen so far is a valid insn and if not.

Copy linux/kconfig.h for the tools-version of the decoder so that it can
use IS_ENABLED().

Also, cast the INSN_MODE_KERN dummy define value to (enum insn_mode)
for tools use of the decoder because perf tool builds with -Werror and
errors out with -Werror=sign-compare otherwise.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Link: https://lkml.kernel.org/r/20210304174237.31945-5-bp@alien8.de
parent d30c7b82

arch/x86/include/asm/insn.h

+17 −7
Original line number Diff line number Diff line
@@ -132,13 +132,23 @@ struct insn { 
#define X86_VEX_M_MAX	0x1f			/* VEX3.M Maximum value */



extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64);

extern void insn_get_prefixes(struct insn *insn);

extern void insn_get_opcode(struct insn *insn);

extern void insn_get_modrm(struct insn *insn);

extern void insn_get_sib(struct insn *insn);

extern void insn_get_displacement(struct insn *insn);

extern void insn_get_immediate(struct insn *insn);

extern void insn_get_length(struct insn *insn);

extern int insn_get_prefixes(struct insn *insn);

extern int insn_get_opcode(struct insn *insn);

extern int insn_get_modrm(struct insn *insn);

extern int insn_get_sib(struct insn *insn);

extern int insn_get_displacement(struct insn *insn);

extern int insn_get_immediate(struct insn *insn);

extern int insn_get_length(struct insn *insn);



enum insn_mode {

	INSN_MODE_32,

	INSN_MODE_64,

	/* Mode is determined by the current kernel build. */

	INSN_MODE_KERN,

	INSN_NUM_MODES,

};



extern int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m);



/* Attribute will be determined after getting ModRM (for opcode groups) */

static inline void insn_get_attribute(struct insn *insn)

arch/x86/lib/insn.c

+171 −45
Original line number Diff line number Diff line
@@ -14,6 +14,9 @@ 
#include <asm/inat.h> /*__ignore_sync_check__ */

#include <asm/insn.h> /* __ignore_sync_check__ */



#include <linux/errno.h>

#include <linux/kconfig.h>



#include <asm/emulate_prefix.h> /* __ignore_sync_check__ */



#define leXX_to_cpu(t, r)						\
@@ -112,8 +115,12 @@ static void insn_get_emulate_prefix(struct insn *insn) 
 * Populates the @insn->prefixes bitmap, and updates @insn->next_byte

 * to point to the (first) opcode.  No effect if @insn->prefixes.got

 * is already set.

 *

 * * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_prefixes(struct insn *insn)

int insn_get_prefixes(struct insn *insn)

{

	struct insn_field *prefixes = &insn->prefixes;

	insn_attr_t attr;
@@ -121,7 +128,7 @@ void insn_get_prefixes(struct insn *insn) 
	int i, nb;



	if (prefixes->got)

		return;

		return 0;



	insn_get_emulate_prefix(insn);
@@ -231,8 +238,10 @@ void insn_get_prefixes(struct insn *insn) 


	prefixes->got = 1;



	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -244,16 +253,25 @@ void insn_get_prefixes(struct insn *insn) 
 * If necessary, first collects any preceding (prefix) bytes.

 * Sets @insn->opcode.value = opcode1.  No effect if @insn->opcode.got

 * is already 1.

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_opcode(struct insn *insn)

int insn_get_opcode(struct insn *insn)

{

	struct insn_field *opcode = &insn->opcode;

	int pfx_id, ret;

	insn_byte_t op;

	int pfx_id;



	if (opcode->got)

		return;

	if (!insn->prefixes.got)

		insn_get_prefixes(insn);

		return 0;



	if (!insn->prefixes.got) {

		ret = insn_get_prefixes(insn);

		if (ret)

			return ret;

	}



	/* Get first opcode */

	op = get_next(insn_byte_t, insn);
@@ -268,9 +286,13 @@ void insn_get_opcode(struct insn *insn) 
		insn->attr = inat_get_avx_attribute(op, m, p);

		if ((inat_must_evex(insn->attr) && !insn_is_evex(insn)) ||

		    (!inat_accept_vex(insn->attr) &&

		     !inat_is_group(insn->attr)))

			insn->attr = 0;	/* This instruction is bad */

		goto end;	/* VEX has only 1 byte for opcode */

		     !inat_is_group(insn->attr))) {

			/* This instruction is bad */

			insn->attr = 0;

			return -EINVAL;

		}

		/* VEX has only 1 byte for opcode */

		goto end;

	}



	insn->attr = inat_get_opcode_attribute(op);
@@ -281,13 +303,18 @@ void insn_get_opcode(struct insn *insn) 
		pfx_id = insn_last_prefix_id(insn);

		insn->attr = inat_get_escape_attribute(op, pfx_id, insn->attr);

	}

	if (inat_must_vex(insn->attr))

		insn->attr = 0;	/* This instruction is bad */



	if (inat_must_vex(insn->attr)) {

		/* This instruction is bad */

		insn->attr = 0;

		return -EINVAL;

	}

end:

	opcode->got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -297,15 +324,25 @@ void insn_get_opcode(struct insn *insn) 
 * Populates @insn->modrm and updates @insn->next_byte to point past the

 * ModRM byte, if any.  If necessary, first collects the preceding bytes

 * (prefixes and opcode(s)).  No effect if @insn->modrm.got is already 1.

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_modrm(struct insn *insn)

int insn_get_modrm(struct insn *insn)

{

	struct insn_field *modrm = &insn->modrm;

	insn_byte_t pfx_id, mod;

	int ret;



	if (modrm->got)

		return;

	if (!insn->opcode.got)

		insn_get_opcode(insn);

		return 0;



	if (!insn->opcode.got) {

		ret = insn_get_opcode(insn);

		if (ret)

			return ret;

	}



	if (inat_has_modrm(insn->attr)) {

		mod = get_next(insn_byte_t, insn);
@@ -314,17 +351,22 @@ void insn_get_modrm(struct insn *insn) 
			pfx_id = insn_last_prefix_id(insn);

			insn->attr = inat_get_group_attribute(mod, pfx_id,

							      insn->attr);

			if (insn_is_avx(insn) && !inat_accept_vex(insn->attr))

				insn->attr = 0;	/* This is bad */

			if (insn_is_avx(insn) && !inat_accept_vex(insn->attr)) {

				/* Bad insn */

				insn->attr = 0;

				return -EINVAL;

			}

		}

	}



	if (insn->x86_64 && inat_is_force64(insn->attr))

		insn->opnd_bytes = 8;



	modrm->got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}
@@ -338,11 +380,16 @@ void insn_get_modrm(struct insn *insn) 
int insn_rip_relative(struct insn *insn)

{

	struct insn_field *modrm = &insn->modrm;

	int ret;



	if (!insn->x86_64)

		return 0;

	if (!modrm->got)

		insn_get_modrm(insn);



	if (!modrm->got) {

		ret = insn_get_modrm(insn);

		if (ret)

			return 0;

	}

	/*

	 * For rip-relative instructions, the mod field (top 2 bits)

	 * is zero and the r/m field (bottom 3 bits) is 0x5.
@@ -356,15 +403,25 @@ int insn_rip_relative(struct insn *insn) 
 *

 * If necessary, first collects the instruction up to and including the

 * ModRM byte.

 *

 * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

void insn_get_sib(struct insn *insn)

int insn_get_sib(struct insn *insn)

{

	insn_byte_t modrm;

	int ret;



	if (insn->sib.got)

		return;

	if (!insn->modrm.got)

		insn_get_modrm(insn);

		return 0;



	if (!insn->modrm.got) {

		ret = insn_get_modrm(insn);

		if (ret)

			return ret;

	}



	if (insn->modrm.nbytes) {

		modrm = insn->modrm.bytes[0];

		if (insn->addr_bytes != 2 &&
@@ -375,8 +432,10 @@ void insn_get_sib(struct insn *insn) 
	}

	insn->sib.got = 1;



	return 0;



err_out:

	return;

	return -ENODATA;

}
@@ -387,15 +446,25 @@ void insn_get_sib(struct insn *insn) 
 * If necessary, first collects the instruction up to and including the

 * SIB byte.

 * Displacement value is sign-expanded.

 *

 * * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

void insn_get_displacement(struct insn *insn)

int insn_get_displacement(struct insn *insn)

{

	insn_byte_t mod, rm, base;

	int ret;



	if (insn->displacement.got)

		return;

	if (!insn->sib.got)

		insn_get_sib(insn);

		return 0;



	if (!insn->sib.got) {

		ret = insn_get_sib(insn);

		if (ret)

			return ret;

	}



	if (insn->modrm.nbytes) {

		/*

		 * Interpreting the modrm byte:
@@ -437,9 +506,10 @@ void insn_get_displacement(struct insn *insn) 
	}

out:

	insn->displacement.got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/* Decode moffset16/32/64. Return 0 if failed */
@@ -538,20 +608,30 @@ static int __get_immptr(struct insn *insn) 
}



/**

 * insn_get_immediate() - Get the immediates of instruction

 * insn_get_immediate() - Get the immediate in an instruction

 * @insn:	&struct insn containing instruction

 *

 * If necessary, first collects the instruction up to and including the

 * displacement bytes.

 * Basically, most of immediates are sign-expanded. Unsigned-value can be

 * get by bit masking with ((1 << (nbytes * 8)) - 1)

 * computed by bit masking with ((1 << (nbytes * 8)) - 1)

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_immediate(struct insn *insn)

int insn_get_immediate(struct insn *insn)

{

	int ret;



	if (insn->immediate.got)

		return;

	if (!insn->displacement.got)

		insn_get_displacement(insn);

		return 0;



	if (!insn->displacement.got) {

		ret = insn_get_displacement(insn);

		if (ret)

			return ret;

	}



	if (inat_has_moffset(insn->attr)) {

		if (!__get_moffset(insn))
@@ -598,9 +678,10 @@ void insn_get_immediate(struct insn *insn) 
	}

done:

	insn->immediate.got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -609,13 +690,58 @@ void insn_get_immediate(struct insn *insn) 
 *

 * If necessary, first collects the instruction up to and including the

 * immediates bytes.

 *

 * Returns:

 *  - 0 on success

 *  - < 0 on error

*/

void insn_get_length(struct insn *insn)

int insn_get_length(struct insn *insn)

{

	int ret;



	if (insn->length)

		return;

	if (!insn->immediate.got)

		insn_get_immediate(insn);

		return 0;



	if (!insn->immediate.got) {

		ret = insn_get_immediate(insn);

		if (ret)

			return ret;

	}



	insn->length = (unsigned char)((unsigned long)insn->next_byte

				     - (unsigned long)insn->kaddr);



	return 0;

}



/**

 * insn_decode() - Decode an x86 instruction

 * @insn:	&struct insn to be initialized

 * @kaddr:	address (in kernel memory) of instruction (or copy thereof)

 * @buf_len:	length of the insn buffer at @kaddr

 * @m:		insn mode, see enum insn_mode

 *

 * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m)

{

	int ret;



/* #define INSN_MODE_KERN	-1 __ignore_sync_check__ mode is only valid in the kernel */



	if (m == INSN_MODE_KERN)

		insn_init(insn, kaddr, buf_len, IS_ENABLED(CONFIG_X86_64));

	else

		insn_init(insn, kaddr, buf_len, m == INSN_MODE_64);



	ret = insn_get_length(insn);

	if (ret)

		return ret;



	if (insn_complete(insn))

		return 0;



	return -EINVAL;

}

tools/arch/x86/include/asm/insn.h

+17 −7
Original line number Diff line number Diff line
@@ -132,13 +132,23 @@ struct insn { 
#define X86_VEX_M_MAX	0x1f			/* VEX3.M Maximum value */



extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64);

extern void insn_get_prefixes(struct insn *insn);

extern void insn_get_opcode(struct insn *insn);

extern void insn_get_modrm(struct insn *insn);

extern void insn_get_sib(struct insn *insn);

extern void insn_get_displacement(struct insn *insn);

extern void insn_get_immediate(struct insn *insn);

extern void insn_get_length(struct insn *insn);

extern int insn_get_prefixes(struct insn *insn);

extern int insn_get_opcode(struct insn *insn);

extern int insn_get_modrm(struct insn *insn);

extern int insn_get_sib(struct insn *insn);

extern int insn_get_displacement(struct insn *insn);

extern int insn_get_immediate(struct insn *insn);

extern int insn_get_length(struct insn *insn);



enum insn_mode {

	INSN_MODE_32,

	INSN_MODE_64,

	/* Mode is determined by the current kernel build. */

	INSN_MODE_KERN,

	INSN_NUM_MODES,

};



extern int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m);



/* Attribute will be determined after getting ModRM (for opcode groups) */

static inline void insn_get_attribute(struct insn *insn)

tools/arch/x86/lib/insn.c

+174 −48
Original line number Diff line number Diff line
@@ -11,10 +11,13 @@ 
#else

#include <string.h>

#endif

#include "../include/asm/inat.h" /* __ignore_sync_check__ */

#include "../include/asm/insn.h" /* __ignore_sync_check__ */

#include <asm/inat.h> /*__ignore_sync_check__ */

#include <asm/insn.h> /* __ignore_sync_check__ */



#include "../include/asm/emulate_prefix.h" /* __ignore_sync_check__ */

#include <linux/errno.h>

#include <linux/kconfig.h>



#include <asm/emulate_prefix.h> /* __ignore_sync_check__ */



#define leXX_to_cpu(t, r)						\

({									\
@@ -112,8 +115,12 @@ static void insn_get_emulate_prefix(struct insn *insn) 
 * Populates the @insn->prefixes bitmap, and updates @insn->next_byte

 * to point to the (first) opcode.  No effect if @insn->prefixes.got

 * is already set.

 *

 * * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_prefixes(struct insn *insn)

int insn_get_prefixes(struct insn *insn)

{

	struct insn_field *prefixes = &insn->prefixes;

	insn_attr_t attr;
@@ -121,7 +128,7 @@ void insn_get_prefixes(struct insn *insn) 
	int i, nb;



	if (prefixes->got)

		return;

		return 0;



	insn_get_emulate_prefix(insn);
@@ -231,8 +238,10 @@ void insn_get_prefixes(struct insn *insn) 


	prefixes->got = 1;



	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -244,16 +253,25 @@ void insn_get_prefixes(struct insn *insn) 
 * If necessary, first collects any preceding (prefix) bytes.

 * Sets @insn->opcode.value = opcode1.  No effect if @insn->opcode.got

 * is already 1.

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_opcode(struct insn *insn)

int insn_get_opcode(struct insn *insn)

{

	struct insn_field *opcode = &insn->opcode;

	int pfx_id, ret;

	insn_byte_t op;

	int pfx_id;



	if (opcode->got)

		return;

	if (!insn->prefixes.got)

		insn_get_prefixes(insn);

		return 0;



	if (!insn->prefixes.got) {

		ret = insn_get_prefixes(insn);

		if (ret)

			return ret;

	}



	/* Get first opcode */

	op = get_next(insn_byte_t, insn);
@@ -268,9 +286,13 @@ void insn_get_opcode(struct insn *insn) 
		insn->attr = inat_get_avx_attribute(op, m, p);

		if ((inat_must_evex(insn->attr) && !insn_is_evex(insn)) ||

		    (!inat_accept_vex(insn->attr) &&

		     !inat_is_group(insn->attr)))

			insn->attr = 0;	/* This instruction is bad */

		goto end;	/* VEX has only 1 byte for opcode */

		     !inat_is_group(insn->attr))) {

			/* This instruction is bad */

			insn->attr = 0;

			return -EINVAL;

		}

		/* VEX has only 1 byte for opcode */

		goto end;

	}



	insn->attr = inat_get_opcode_attribute(op);
@@ -281,13 +303,18 @@ void insn_get_opcode(struct insn *insn) 
		pfx_id = insn_last_prefix_id(insn);

		insn->attr = inat_get_escape_attribute(op, pfx_id, insn->attr);

	}

	if (inat_must_vex(insn->attr))

		insn->attr = 0;	/* This instruction is bad */



	if (inat_must_vex(insn->attr)) {

		/* This instruction is bad */

		insn->attr = 0;

		return -EINVAL;

	}

end:

	opcode->got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -297,15 +324,25 @@ void insn_get_opcode(struct insn *insn) 
 * Populates @insn->modrm and updates @insn->next_byte to point past the

 * ModRM byte, if any.  If necessary, first collects the preceding bytes

 * (prefixes and opcode(s)).  No effect if @insn->modrm.got is already 1.

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_modrm(struct insn *insn)

int insn_get_modrm(struct insn *insn)

{

	struct insn_field *modrm = &insn->modrm;

	insn_byte_t pfx_id, mod;

	int ret;



	if (modrm->got)

		return;

	if (!insn->opcode.got)

		insn_get_opcode(insn);

		return 0;



	if (!insn->opcode.got) {

		ret = insn_get_opcode(insn);

		if (ret)

			return ret;

	}



	if (inat_has_modrm(insn->attr)) {

		mod = get_next(insn_byte_t, insn);
@@ -314,17 +351,22 @@ void insn_get_modrm(struct insn *insn) 
			pfx_id = insn_last_prefix_id(insn);

			insn->attr = inat_get_group_attribute(mod, pfx_id,

							      insn->attr);

			if (insn_is_avx(insn) && !inat_accept_vex(insn->attr))

				insn->attr = 0;	/* This is bad */

			if (insn_is_avx(insn) && !inat_accept_vex(insn->attr)) {

				/* Bad insn */

				insn->attr = 0;

				return -EINVAL;

			}

		}

	}



	if (insn->x86_64 && inat_is_force64(insn->attr))

		insn->opnd_bytes = 8;



	modrm->got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}
@@ -338,11 +380,16 @@ void insn_get_modrm(struct insn *insn) 
int insn_rip_relative(struct insn *insn)

{

	struct insn_field *modrm = &insn->modrm;

	int ret;



	if (!insn->x86_64)

		return 0;

	if (!modrm->got)

		insn_get_modrm(insn);



	if (!modrm->got) {

		ret = insn_get_modrm(insn);

		if (ret)

			return 0;

	}

	/*

	 * For rip-relative instructions, the mod field (top 2 bits)

	 * is zero and the r/m field (bottom 3 bits) is 0x5.
@@ -356,15 +403,25 @@ int insn_rip_relative(struct insn *insn) 
 *

 * If necessary, first collects the instruction up to and including the

 * ModRM byte.

 *

 * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

void insn_get_sib(struct insn *insn)

int insn_get_sib(struct insn *insn)

{

	insn_byte_t modrm;

	int ret;



	if (insn->sib.got)

		return;

	if (!insn->modrm.got)

		insn_get_modrm(insn);

		return 0;



	if (!insn->modrm.got) {

		ret = insn_get_modrm(insn);

		if (ret)

			return ret;

	}



	if (insn->modrm.nbytes) {

		modrm = insn->modrm.bytes[0];

		if (insn->addr_bytes != 2 &&
@@ -375,8 +432,10 @@ void insn_get_sib(struct insn *insn) 
	}

	insn->sib.got = 1;



	return 0;



err_out:

	return;

	return -ENODATA;

}
@@ -387,15 +446,25 @@ void insn_get_sib(struct insn *insn) 
 * If necessary, first collects the instruction up to and including the

 * SIB byte.

 * Displacement value is sign-expanded.

 *

 * * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

void insn_get_displacement(struct insn *insn)

int insn_get_displacement(struct insn *insn)

{

	insn_byte_t mod, rm, base;

	int ret;



	if (insn->displacement.got)

		return;

	if (!insn->sib.got)

		insn_get_sib(insn);

		return 0;



	if (!insn->sib.got) {

		ret = insn_get_sib(insn);

		if (ret)

			return ret;

	}



	if (insn->modrm.nbytes) {

		/*

		 * Interpreting the modrm byte:
@@ -437,9 +506,10 @@ void insn_get_displacement(struct insn *insn) 
	}

out:

	insn->displacement.got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/* Decode moffset16/32/64. Return 0 if failed */
@@ -538,20 +608,30 @@ static int __get_immptr(struct insn *insn) 
}



/**

 * insn_get_immediate() - Get the immediates of instruction

 * insn_get_immediate() - Get the immediate in an instruction

 * @insn:	&struct insn containing instruction

 *

 * If necessary, first collects the instruction up to and including the

 * displacement bytes.

 * Basically, most of immediates are sign-expanded. Unsigned-value can be

 * get by bit masking with ((1 << (nbytes * 8)) - 1)

 * computed by bit masking with ((1 << (nbytes * 8)) - 1)

 *

 * Returns:

 * 0:  on success

 * < 0: on error

 */

void insn_get_immediate(struct insn *insn)

int insn_get_immediate(struct insn *insn)

{

	int ret;



	if (insn->immediate.got)

		return;

	if (!insn->displacement.got)

		insn_get_displacement(insn);

		return 0;



	if (!insn->displacement.got) {

		ret = insn_get_displacement(insn);

		if (ret)

			return ret;

	}



	if (inat_has_moffset(insn->attr)) {

		if (!__get_moffset(insn))
@@ -598,9 +678,10 @@ void insn_get_immediate(struct insn *insn) 
	}

done:

	insn->immediate.got = 1;

	return 0;



err_out:

	return;

	return -ENODATA;

}



/**
@@ -609,13 +690,58 @@ void insn_get_immediate(struct insn *insn) 
 *

 * If necessary, first collects the instruction up to and including the

 * immediates bytes.

 *

 * Returns:

 *  - 0 on success

 *  - < 0 on error

*/

void insn_get_length(struct insn *insn)

int insn_get_length(struct insn *insn)

{

	int ret;



	if (insn->length)

		return;

	if (!insn->immediate.got)

		insn_get_immediate(insn);

		return 0;



	if (!insn->immediate.got) {

		ret = insn_get_immediate(insn);

		if (ret)

			return ret;

	}



	insn->length = (unsigned char)((unsigned long)insn->next_byte

				     - (unsigned long)insn->kaddr);



	return 0;

}



/**

 * insn_decode() - Decode an x86 instruction

 * @insn:	&struct insn to be initialized

 * @kaddr:	address (in kernel memory) of instruction (or copy thereof)

 * @buf_len:	length of the insn buffer at @kaddr

 * @m:		insn mode, see enum insn_mode

 *

 * Returns:

 * 0: if decoding succeeded

 * < 0: otherwise.

 */

int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m)

{

	int ret;



#define INSN_MODE_KERN (enum insn_mode)-1 /* __ignore_sync_check__ mode is only valid in the kernel */



	if (m == INSN_MODE_KERN)

		insn_init(insn, kaddr, buf_len, IS_ENABLED(CONFIG_X86_64));

	else

		insn_init(insn, kaddr, buf_len, m == INSN_MODE_64);



	ret = insn_get_length(insn);

	if (ret)

		return ret;



	if (insn_complete(insn))

		return 0;



	return -EINVAL;

}

tools/include/linux/kconfig.h

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _TOOLS_LINUX_KCONFIG_H

#define _TOOLS_LINUX_KCONFIG_H



/* CONFIG_CC_VERSION_TEXT (Do not delete this comment. See help in Kconfig) */



#ifdef CONFIG_CPU_BIG_ENDIAN

#define __BIG_ENDIAN 4321

#else

#define __LITTLE_ENDIAN 1234

#endif



#define __ARG_PLACEHOLDER_1 0,

#define __take_second_arg(__ignored, val, ...) val



/*

 * The use of "&&" / "||" is limited in certain expressions.

 * The following enable to calculate "and" / "or" with macro expansion only.

 */

#define __and(x, y)			___and(x, y)

#define ___and(x, y)			____and(__ARG_PLACEHOLDER_##x, y)

#define ____and(arg1_or_junk, y)	__take_second_arg(arg1_or_junk y, 0)



#define __or(x, y)			___or(x, y)

#define ___or(x, y)			____or(__ARG_PLACEHOLDER_##x, y)

#define ____or(arg1_or_junk, y)		__take_second_arg(arg1_or_junk 1, y)



/*

 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that

 * these only work with boolean and tristate options.

 */



/*

 * Getting something that works in C and CPP for an arg that may or may

 * not be defined is tricky.  Here, if we have "#define CONFIG_BOOGER 1"

 * we match on the placeholder define, insert the "0," for arg1 and generate

 * the triplet (0, 1, 0).  Then the last step cherry picks the 2nd arg (a one).

 * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when

 * the last step cherry picks the 2nd arg, we get a zero.

 */

#define __is_defined(x)			___is_defined(x)

#define ___is_defined(val)		____is_defined(__ARG_PLACEHOLDER_##val)

#define ____is_defined(arg1_or_junk)	__take_second_arg(arg1_or_junk 1, 0)



/*

 * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0

 * otherwise. For boolean options, this is equivalent to

 * IS_ENABLED(CONFIG_FOO).

 */

#define IS_BUILTIN(option) __is_defined(option)



/*

 * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0

 * otherwise.

 */

#define IS_MODULE(option) __is_defined(option##_MODULE)



/*

 * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled

 * code can call a function defined in code compiled based on CONFIG_FOO.

 * This is similar to IS_ENABLED(), but returns false when invoked from

 * built-in code when CONFIG_FOO is set to 'm'.

 */

#define IS_REACHABLE(option) __or(IS_BUILTIN(option), \

				__and(IS_MODULE(option), __is_defined(MODULE)))



/*

 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',

 * 0 otherwise.

 */

#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))



#endif /* _TOOLS_LINUX_KCONFIG_H */