xref: /illumos-gate/usr/src/cmd/sgs/liblddbg/common/sections.c (revision e64d0ff9)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#include	<stdio.h>
#include	"msg.h"
#include	"_debug.h"
#include	"libld.h"
#include	"_string_table.h"

/*
 * Format an input section descriptor name for output, in the format
 *	[ndx]name
 * If possible, a user supplied fixed size buffer is used. Failing that,
 * dynamic memory is allocated, which must be freed by the caller.
 *
 * entry:
 *	[dbg_fmt_isec_name2]: name, scnndx  - Name and section index
 *	[dbg_fmt_isec_name]: isp - Input section descriptor giving name
 *		and index.
 *
 *	buf - Caller supplied buffer
 *	alloc_mem - Address of pointer to be set to address of allocated
 *		memory, or NULL if no memory is allocated.
 *
 * exit:
 *	A pointer to the formatted string is returned. If the supplied buffer
 *	was sufficient, *alloc_mem is set to NULL. If memory was allocated,
 *	*alloc_mem references it. The caller must free this memory after use.
 */
const char *
dbg_fmt_isec_name2(const char *name, Word scnndx, dbg_isec_name_buf_t buf,
    char **alloc_mem)
{
	int	cnt;

	/*
	 * If the section index is 0, it's not a real section.
	 * Just use the name as is.
	 */
	if (scnndx == 0) {
		*alloc_mem = NULL;
		return (name);
	}

	/* Format into the fixed buffer */
	cnt = snprintf(buf, sizeof (dbg_isec_name_buf_t),
	    MSG_ORIG(MSG_FMT_ISEC_NAME), EC_WORD(scnndx), name);

	/*
	 * If the name was too long, try to allocate a dynamic buffer.
	 * Failing that, fall through and use the clipped one already
	 * formatted into buf, as that's better than nothing.
	 */
	if ((cnt >= sizeof (dbg_isec_name_buf_t)) &&
	    ((*alloc_mem = malloc(cnt + 1)) != NULL)) {
		(void) snprintf(*alloc_mem, cnt + 1,
		    MSG_ORIG(MSG_FMT_ISEC_NAME), EC_WORD(scnndx), name);
		return (*alloc_mem);
	}

	/* Return the caller supplied buffer */
	*alloc_mem = NULL;
	return (buf);
}
const char *
dbg_fmt_isec_name(Is_desc *isp, dbg_isec_name_buf_t buf, char **alloc_mem)
{
	return (dbg_fmt_isec_name2(isp->is_name, isp->is_scnndx, buf,
	    alloc_mem));
}

void
Dbg_sec_strtab(Lm_list *lml, Os_desc *osp, Str_tbl *stp)
{
	uint_t	cnt;

	if (DBG_NOTCLASS(DBG_C_STRTAB))
		return;

	if (!osp)
		return;

	Dbg_util_nl(lml, DBG_NL_STD);
	if (stp->st_flags & FLG_STTAB_COMPRESS)
		dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_COMP), osp->os_name,
		    EC_XWORD(stp->st_fullstrsize), EC_XWORD(stp->st_strsize));
	else
		dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_STND), osp->os_name,
		    EC_XWORD(stp->st_fullstrsize));

	if ((DBG_NOTDETAIL()) ||
	    ((stp->st_flags & FLG_STTAB_COMPRESS) == 0))
		return;

	dbg_print(lml, MSG_ORIG(MSG_STR_EMPTY));
	dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_HD), osp->os_name,
	    stp->st_hbckcnt);

	for (cnt = 0; cnt < stp->st_hbckcnt; cnt++) {
		Str_hash	*strhash = stp->st_hashbcks[cnt];

		if (strhash == NULL)
			continue;

		dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_BCKT), cnt);

		while (strhash) {
			size_t	stroff = strhash->hi_mstr->sm_strlen -
			    strhash->hi_strlen;

			if (stroff == 0) {
				dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_MSTR),
				    EC_XWORD(strhash->hi_refcnt),
				    strhash->hi_mstr->sm_str);
			} else {
				dbg_print(lml, MSG_INTL(MSG_SEC_STRTAB_SUFSTR),
				    EC_XWORD(strhash->hi_refcnt),
				    &strhash->hi_mstr->sm_str[stroff],
				    strhash->hi_mstr->sm_str);
			}

			strhash = strhash->hi_next;
		}
	}
}

void
Dbg_sec_genstr_compress(Lm_list *lml, const char *os_name,
    Xword raw_size, Xword merge_size)
{
	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	dbg_print(lml, MSG_INTL(MSG_SEC_GENSTR_COMP), os_name,
	    EC_XWORD(raw_size), EC_XWORD(merge_size));
}

void
Dbg_sec_unsup_strmerge(Lm_list *lml, Is_desc *isp)
{
	dbg_isec_name_buf_t	buf;
	char			*alloc_mem;
	const char		*str;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	/*
	 * We can only merge string table sections with single byte
	 * (char) characters. For any other (wide) character types,
	 * issue a message so the user will understand why these
	 * sections are not being picked up.
	 */
	if ((isp->is_shdr->sh_entsize > 1) ||
	    (isp->is_shdr->sh_addralign > 1)) {
		str = (isp->is_file != NULL) ? isp->is_file->ifl_name :
		    MSG_INTL(MSG_STR_NULL);
		dbg_print(lml, MSG_INTL(MSG_SEC_STRMERGE_UNSUP),
		    dbg_fmt_isec_name(isp, buf, &alloc_mem), str,
		    EC_XWORD(isp->is_shdr->sh_addralign),
		    EC_XWORD(isp->is_shdr->sh_entsize));
		if (alloc_mem != NULL)
			free(alloc_mem);
	}
}

void
Dbg_sec_backing(Lm_list *lml)
{
	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	Dbg_util_nl(lml, DBG_NL_STD);
	dbg_print(lml, MSG_INTL(MSG_SEC_BACKING));
}

void
Dbg_sec_in(Lm_list *lml, Is_desc *isp)
{
	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	if (isp->is_flags & FLG_IS_GNSTRMRG) {
		/*
		 * This section was generated because we have 1 or
		 * more SHF_MERGE|SHF_STRINGS input sections that we
		 * wish to merge. This new section will ultimately
		 * end up replacing those sections once it has been filled
		 * with their strings (merged and compressed) and relocations
		 * have been redirected.
		 */
		dbg_print(lml, MSG_INTL(MSG_SEC_INPUT_GENSTR), isp->is_name);
	} else if (isp->is_file == NULL) {
		/* Generated input section */
		dbg_print(lml, MSG_INTL(MSG_SEC_INPUT_GEN), isp->is_name);
	} else {
		/* Standard input section */
		dbg_isec_name_buf_t	buf;
		char			*alloc_mem;

		dbg_print(lml, MSG_INTL(MSG_SEC_INPUT),
		    dbg_fmt_isec_name(isp, buf, &alloc_mem),
		    isp->is_file->ifl_name);
		if (alloc_mem != NULL)
			free(alloc_mem);
	}
}

void
Dbg_sec_added(Lm_list *lml, Os_desc *osp, Sg_desc *sgp)
{
	const char	*str;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	if (sgp->sg_name && *sgp->sg_name)
		str = sgp->sg_name;
	else
		str = MSG_INTL(MSG_STR_NULL);

	dbg_print(lml, MSG_INTL(MSG_SEC_ADDED), osp->os_name, str);
}

void
Dbg_sec_created(Lm_list *lml, Os_desc *osp, Sg_desc *sgp)
{
	const char	*str;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	if (sgp->sg_name && *sgp->sg_name)
		str = sgp->sg_name;
	else
		str = MSG_INTL(MSG_STR_NULL);

	dbg_print(lml, MSG_INTL(MSG_SEC_CREATED), osp->os_name, str);
}

void
Dbg_sec_discarded(Lm_list *lml, Is_desc *isp, Is_desc *disp)
{
	if (DBG_NOTCLASS(DBG_C_SECTIONS | DBG_C_UNUSED))
		return;

	if ((isp->is_flags & FLG_IS_INSTRMRG) &&
	    (disp->is_flags & FLG_IS_GNSTRMRG)) {
		/*
		 * This SHF_MERGE|SHF_STRINGS input section is being
		 * discarded in favor of the generated merged string section.
		 */
		dbg_isec_name_buf_t	buf;
		char			*alloc_mem;

		dbg_print(lml, MSG_INTL(MSG_SEC_STRMERGE_DISCARDED),
		    dbg_fmt_isec_name(isp, buf, &alloc_mem),
		    isp->is_file->ifl_name);
		if (alloc_mem != NULL)
			free(alloc_mem);
	} else {
		/* Generic section discard */
		dbg_isec_name_buf_t	buf1, buf2;
		char			*alloc_mem1, *alloc_mem2;

		dbg_print(lml, MSG_INTL(MSG_SEC_DISCARDED),
		    dbg_fmt_isec_name(isp, buf1, &alloc_mem1),
		    isp->is_file->ifl_name,
		    dbg_fmt_isec_name(disp, buf2, &alloc_mem2),
		    disp->is_file->ifl_name);
		if (alloc_mem1 != NULL)
			free(alloc_mem1);
		if (alloc_mem2 != NULL)
			free(alloc_mem2);
	}
}

void
Dbg_sec_group(Lm_list *lml, Is_desc *isp, Group_desc *gdp)
{
	dbg_isec_name_buf_t	buf;
	char			*alloc_mem;
	const char		*comdat, *isp_str;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	if (gdp->gd_data[0] & GRP_COMDAT)
		comdat = MSG_ORIG(MSG_STR_COMDAT);
	else
		comdat = MSG_ORIG(MSG_STR_EMPTY);

	isp_str = dbg_fmt_isec_name(isp, buf, &alloc_mem);

	if (isp->is_shdr->sh_type == SHT_GROUP) {
		dbg_print(lml, MSG_INTL(MSG_SEC_GRP_DEFINE), isp_str,
		    isp->is_file->ifl_name, comdat, gdp->gd_name);
	} else {
		dbg_print(lml, MSG_INTL(MSG_SEC_GRP_MEMBER), isp_str,
		    isp->is_file->ifl_name, comdat, gdp->gd_name);
	}

	if (gdp->gd_oisc) {
		dbg_print(lml, MSG_INTL(MSG_SEC_GRP_DISCARDED), isp_str,
		    isp->is_file->ifl_name, gdp->gd_name,
		    gdp->gd_oisc->is_file->ifl_name);
	}

	if (alloc_mem != NULL)
		free(alloc_mem);
}

void
Dbg_sec_order_list(Ofl_desc *ofl, int flag)
{
	Os_desc		*osp;
	Is_desc		*isp1;
	Aliste		idx1;
	Lm_list		*lml = ofl->ofl_lml;
	const char	*str;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;
	if (DBG_NOTDETAIL())
		return;

	Dbg_util_nl(lml, DBG_NL_STD);

	/*
	 * If the flag == 0, then the routine is called before sorting.
	 */
	if (flag == 0)
		str = MSG_INTL(MSG_ORD_SORT_BEFORE);
	else
		str = MSG_INTL(MSG_ORD_SORT_AFTER);

	for (APLIST_TRAVERSE(ofl->ofl_ordered, idx1, osp)) {
		int		os_isdescs_idx;
		Aliste		idx2;

		Dbg_util_nl(lml, DBG_NL_STD);
		dbg_print(lml, str, osp->os_name);
		dbg_print(lml, MSG_INTL(MSG_ORD_HDR_1),
		    EC_WORD(aplist_nitems(osp->os_isdescs[OS_ISD_BEFORE])),
		    EC_WORD(aplist_nitems(osp->os_isdescs[OS_ISD_ORDERED])),
		    EC_WORD(aplist_nitems(osp->os_isdescs[OS_ISD_DEFAULT])),
		    EC_WORD(aplist_nitems(osp->os_isdescs[OS_ISD_AFTER])));

		OS_ISDESCS_TRAVERSE(os_isdescs_idx, osp, idx2, isp1) {
			dbg_isec_name_buf_t	buf;
			char			*alloc_mem;
			const char		*isp1_str;
			Word			link;
			Ifl_desc		*ifl = isp1->is_file;
			Is_desc			*isp2;
			const char		*msg;

			/*
			 * An output segment that requires ordering might have
			 * as little as two sorted input sections.  For example,
			 * the crt's can provide a SHN_BEGIN and SHN_AFTER, and
			 * only these two sections must be processed.  Thus, if
			 * a input section is unordered, move on.  Diagnosing
			 * any unsorted section can produce way too much noise.
			 */
			if ((isp1->is_flags & FLG_IS_ORDERED) == 0)
				continue;

			if (isp1->is_shdr->sh_flags & SHF_ORDERED) {
				link = isp1->is_shdr->sh_info;
				msg = MSG_ORIG(MSG_SH_INFO);
			} else {	/* SHF_LINK_ORDER */
				link = isp1->is_shdr->sh_link;
				msg = MSG_ORIG(MSG_SH_LINK);
			}

			isp1_str = dbg_fmt_isec_name(isp1, buf, &alloc_mem);

			if (link == SHN_BEFORE) {
				dbg_print(lml, MSG_INTL(MSG_ORD_TITLE_1), msg,
				    isp1_str, isp1->is_file->ifl_name);
			} else if (link == SHN_AFTER) {
				dbg_print(lml, MSG_INTL(MSG_ORD_TITLE_2), msg,
				    isp1_str, isp1->is_file->ifl_name);
			} else {
				isp2 = ifl->ifl_isdesc[link];
				dbg_print(lml, MSG_INTL(MSG_ORD_TITLE_3),
				    EC_WORD(isp2->is_keyident), isp1_str,
				    ifl->ifl_name, msg, isp2->is_name);
			}
			if (alloc_mem != NULL)
				free(alloc_mem);
		}
	}
	Dbg_util_nl(lml, DBG_NL_STD);
}

/*
 * Error message string table.
 */
static const Msg order_errors[] = {
	MSG_ORD_ERR_INFORANGE,		/* MSG_INTL(MSG_ORD_ERR_INFORANGE) */
	MSG_ORD_ERR_ORDER,		/* MSG_INTL(MSG_ORD_ERR_ORDER) */
	MSG_ORD_ERR_LINKRANGE,		/* MSG_INTL(MSG_ORD_ERR_LINKRANGE) */
	MSG_ORD_ERR_FLAGS,		/* MSG_INTL(MSG_ORD_ERR_FLAGS) */
	MSG_ORD_ERR_CYCLIC,		/* MSG_INTL(MSG_ORD_ERR_CYCLIC) */
	MSG_ORD_ERR_LINKINV		/* MSG_INTL(MSG_ORD_ERR_LINKINV) */
};

void
Dbg_sec_order_error(Lm_list *lml, Ifl_desc *ifl, Word ndx, int error)
{
	dbg_isec_name_buf_t	buf;
	char			*alloc_mem;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;
	if (DBG_NOTDETAIL())
		return;

	if (error == 0)
		return;

	dbg_print(lml, MSG_INTL(MSG_ORD_ERR_TITLE),
	    dbg_fmt_isec_name(ifl->ifl_isdesc[ndx], buf, &alloc_mem),
	    ifl->ifl_name);
	if (alloc_mem != NULL)
		free(alloc_mem);

	if (error)
		dbg_print(lml, MSG_INTL(order_errors[error - 1]));
}

void
Dbg_sec_redirected(Lm_list *lml, Is_desc *isp, const char *nname)
{
	dbg_isec_name_buf_t	buf;
	char			*alloc_mem;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	dbg_print(lml, MSG_INTL(MSG_SEC_REDIRECTED),
	    dbg_fmt_isec_name(isp, buf, &alloc_mem), nname);
	if (alloc_mem != NULL)
		free(alloc_mem);
}

void
Dbg_sec_gnu_comdat(Lm_list *lml, Is_desc *isp, Boolean comdat, Boolean relax)
{
	dbg_isec_name_buf_t	buf;
	char			*alloc_mem;
	const char		*fmt;

	if (DBG_NOTCLASS(DBG_C_SECTIONS))
		return;

	if (comdat && relax)
		fmt = MSG_INTL(MSG_SEC_GNU_COMDAT_1);
	else if (comdat)
		fmt = MSG_INTL(MSG_SEC_GNU_COMDAT_2);
	else
		fmt = MSG_INTL(MSG_SEC_GNU_COMDAT_3);

	dbg_print(lml, fmt, dbg_fmt_isec_name(isp, buf, &alloc_mem));
	if (alloc_mem != NULL)
		free(alloc_mem);
}